manual 1hse96002-12

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ManualOutdoor instrument transormers

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2/482 Table o contents | Manual

Table o contents

General inormation Outdoor instrument transormers 3

Denitions 4

Packaging, transport and storage 6

IMB 36-800 kV Installation 8

Maintenance 10

Oil sampling 12

Tan- measurement 14

EMF 52-170 kV Installation 16

Maintenance 18

Oil sampling 19

CPB 72-800 kV Installation 20

Maintenance 23

Oil sampling 24

CCB 72-800 kV Installation 26

Maintenance 27

Optional accessories Surge arrester 28

Manometer 29

Anti-condensation heater 30

Spark gap device 31

Oil test plug 32

Oil test valve 33

PLC carrier accessories 34

PQSensor 38

Undrilled top plate 40

C2 test outlet 41

Pre-/post-energizing Lie cycle analysis 42

Troubleshooting 44

Checklist 45

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3/48Manual | Outdoor instrument transormers 3

Outdoor instrument transormers

Thank you or purchasing an ABB outdoor instrument transormer. Please careully

read the applicable parts o this manual beore installing and energizing the instrumenttransormer.

The manual should be saved or uture reerence or the entire service lie o theinstrument transormer. The gures in this manual are only intended or illustrativepurposes.

Please contact your local ABB oce i you have any questions.

ABB has been producing instrument transormers or more than

60 years. Thousands o our products perorm vital unctions in

electric power networks around the world day ater day, all year

round. Their main applications include revenue metering, control,

indication and relay protection.

All instrument transormers supplied by ABB are tailor-made to

meet the needs o our customers. An instrument transormer

must be capable o withstanding very high stresses in all climatic

conditions. We design and manuacture our products or a service

lie o at least 30 years. Actually, most last even longer.

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4/484 Denitions | Manual

System voltage

The system voltage is the maximum voltage (phase to phase),

expressed in kV RMS, o the system or which the equipment is

intended. It is also known as maximum system voltage.

Rated insulation level

The combination o voltage values that characterize the insulation

o an instrument transormer with regard to its capability to

withstand dielectric stresses. The rated value given is valid

or altitudes 1000 m above sea level. A correction actor is

introduced or higher altitudes.

Lightning impulse test

The lightning impulse test is perormed with a standardized wave

shape 1.2/50 s or simulation o lightning overvoltage.

Rated power requency withstand voltage

This test is to show that the apparatus can withstand the power

requency overvoltages that can occur. The rated power requency

withstand voltage indicates the required withstand voltage. The

value is expressed in kV RMS.

Rated SIWL

For voltages 300 kV the power-requency voltage test is partlyreplaced by the switching impulse test. The wave shape 250/2500

s simulates switching overvoltage. The rated switching impulse

withstand level (SIWL) indicates the required withstand level

phase-to-ground (phase to-earth). The value is expressed in kV as

a peak value.

Rated chopped wave impulse withstand voltage, phase-to-

ground

The rated chopped wave impulse withstand level at 2 s and 3

s respectively, indicates the required withstand level phase-to-

ground (phase-to-earth).

Installation altitude

I installed >1000 m above sea level, the external dielectric

strength is reduced due to the lower density o the air. Always

speciy the installation altitude and normal rated insulation levels.

ABB will make the needed correction when an altitude higher than

1000 meters ASL is specied. Internal insulation is not aected by

installation altitude, and dielectric routine tests will be perormed at

the rated insulation levels.

Creepage distance

The creepage distance is dened as the shortest distance along

the surace o an insulator between high voltage and ground.

Rated requency

The rated (power) requency is the nominal requency o the

system expressed in Hz or which the instrument transormer is

designed to operate. Standard requencies are 50 Hz and 60

Hz. Other requencies, such as 16 2/3 Hz and 25 Hz, might be

applicable or some railway applications.

Ambient temperature

Average 24-hour ambient temperature above the standardized

+35C infuences the thermal design o the transormer and must

thereore be specied.

Pollution level

Environmental conditions with respect to pollution are sometimes

categorized in pollution levels. Five pollution levels are described in

IEC 60815-1.

Wind load

The specied wind load or an instrument transormer intended or

outdoor normal conditions is based on a wind speed o 34 m/s.

Rated primary current

The rated current (sometimes reerred to as rated current,

nominal current or rated continuous current) is the maximumcontinuous current the equipment is allowed to carry. The current

is expressed in A RMS. The maximum continuous thermal current

is based on an average 24-hour ambient temperature o +35C.

It should be selected about 1040% higher than the estimated

operating current. The closest standardized value should be

chosen.

Extended current ratings

A actor that multiplied by the rated current gives the maximum

continuous load current and the limit or accuracy. Standard

values or extended primary current are 120, 150 and 200% o

rated current. Unless otherwise specied, the rated continuousthermal current shall be the rated primary current.

Rated secondary current

The standard values are 1, 2 and 5 A. 1 A gives an overall lower

load requirement through lower cable load.

Rated short-time thermal current (Ith)

The rated short-time withstand current is the maximum current

(expressed in kA RMS) that the equipment shall be able to carry

or a specied time duration. Standard values or duration are 1 or

3 s. Ith depends on the short-circuit power o the grid and can be

calculated rom the ormula: Ith = Pk (MW) / Um (kV) x 3 kA.

Denitions

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Rated dynamic current (Idyn

)

The dynamic short-time current is according to IEC,

Idyn

= 2.5 x Ith

and according to IEEE, Idyn

= 2.7 x Ith

Primary reconnection

The ampere turns or a current transormer always remain the

same, and consequently, the load capacity (load) remains the

same. The short-circuit capacity however, may be reduced or the

lower ratios. Primary reconnection is available or currents at ratios

2:1 or 4:2:1.

Secondary reconnectionExtra secondary terminals (taps) are run rom the secondary

winding. The load capacity drops as the ampere turns decrease

on the taps, but the short-circuit capacity remains constant. Each

core can be individually reconnected.

Load

The external impedance in the secondary circuit in ohms at the

specied power actor. It is usually expressed as the apparent

power in VA -, which is taken up at the rated secondary current.

It is important to determine the power consumption o connected

meters and relays including the cables.

RCT

The secondary winding resistance at 75C

Instrument security actor (FS)

To protect meters and instruments rom being damaged by high

currents, an FS actor o 5 or 10 is oten specied or measuring

cores. This means that the secondary current will increase a

maximum o 5 or 10 times when the rated load is connected.

FS10 is normally sucient or modern meters.

Accuracy limit actor (ALF)

The protection cores must be able to reproduce the ault currentwithout being saturated. The overcurrent actor or protection

cores is called ALF. ALF o 10 or 20 is commonly used. Both FS

and ALF are valid at the rated load only. At a lower load the FS

and ALF will increase.

Simultaneous load (IEC)

Metering windings and protection windings not connected

in open delta are considered as under simultaneous load. A

protection winding connected in open delta is not considered as a

simultaneous load.

Voltage actor (FV)

It is important that the voltage transormer, or thermal and

protection reasons, can withstand and reproduce the continuous-

ault overvoltages that can occur in the grid. The overvoltage

actor is abbreviated as FV. The IEC standard species a voltage

actor o 1.2 continuously and simultaneously 1.5/30 s. or

systems with eective grounding with automatic ault tripping, and

1.9/8 h or systems with insulated neutral points without automatic

ground ault systems.

Accuracy, according to IEC, or measuring windings is ullled

between 0.8 and 1.2 x rated voltage and or protection windingsup to the voltage actor (1.5 or 1.9 x rated voltage).

Thermal limit load

Thermal limit load is the total power the transormer can supply

without excessively high temperature rise. The transormer

is engineered so that it can be loaded with the impedance

corresponding to the load at rated voltage, multiplied by the

square o the voltage actor. This means that at a voltage actor

o 1.9/8 h, or example, the limit load = total rated load x 1.92.

The transormer cannot be subjected to a higher limit load

without exceeding the rated load. Consequently, because o load

considerations, it is unnecessary to speciy a higher thermal limitload.

Ferro resonance

Ferro resonance is a potential source o transient overvoltage.

Three-phase and single-phase switching, blown uses, and

broken conductors can result in overvoltage when erro resonance

occurs between the magnetizing impedance o a transormer

and the system capacitance o the isolated phase or phases. For

example, the capacitance could be as simple as a length o cable

connected to the ungrounded winding o a transormer. Another

example o erro resonance occurring is when an inductive voltage

transormer is connected in parallel with a large grading capacitoracross the gap o a circuit breaker. Ferro resonance is usually

known as a series resonance.

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6/486 Packaging, transport and storage | Manual

Packaging, transport and storage

General inormation

As ar as the height permits, instrument transormers are shipped

vertically in packages o three or as single units; see Figure 1 on

the next page. Single units can also be shipped in the horizontal

position depending on the type o transormer.

Note!

Transormers delivered in horizontal creates shall

always be transported, i transported horizontally,

with the same side up as when delivered.

Special optional accessories, such as Roxtec cable entry kitsand certain ground terminals, are kept in the terminal box or are

secured inside the crate together with the primary terminals.

Dampers, adapters, surge arrester etc. are secured to the bottom

o the crate or packed in a separate crate. The crate materials and

packing methods or instrument transormer are specied in the

ollowing chapters o this document.

Crate markings

The ollowing applies to crates:

- A packing list and unpacking instructions are stapled to

the inside o the crate.

- All crates transported in the vertical position are markedwith position tags that are stapled on opposite sides o

the crate.

- The center o gravity is marked on two opposite sides o

the crate.

- The crate label is painted on all our sides. The gross

weight is painted on two opposite sides o the crate.

- When transported horizontally, the goods label is stapled

on two sides o the crate, both the long and the short

side. For vertical transportation the goods label is stapled

on the two short sides o the crate.

- The crate is marked with international pictorial markings

on at least two sides, i.e. ISPM 15, UN3363, MarinePollutant and label o class 9+ label marine pollutants.

Crate disposal

The crates consist o a bottom rame, sides and cover made o

wood. There are also a number o nails, screws and brackets.

Furthermore, there are strips o elt or oam rubber to protect the

paint (only applicable or painted units). These components can be

recycled according to local regulations.

Heat treatment o crates

The wooden transport crates have been debarked and heat

treated in conjunction with kiln drying.

The wood crate material is approved under SWPP, the Swedish

Wood Packing Program, and ullls the requirements or treatment

and marking stipulated in the FAO standard

ISPM 15.

The treated crates are marked with the ISPM 15 symbol to

certiy that they have been subjected to approved measures. The

marking is clearly visible on at least two opposite sides o the

crate.

Transportation

An instrument transormer is packed in an export crate, designedto withstand the stresses o transport and storage. However, the

ollowing have to be considered during transport:

- The instrument transormer must be handled with care to

avoid mechanical damage.

- Liting o the crate is preerably by orklit.

I slings are used, make sure that the slings pass outside

the crossbar at the bottom o the crate to avoid the risk

o dropping the crate.

- Transormers packed vertically must not be tilted more

than 45 during transport or storage.

Caution!Transormers delivered in horizontal creates shall

always be transported, i transported horizontally,

with the same side up as when delivered.

Unpacking

Instructions or unpacking and liting accompany each

transormer. When unpacking, check the contents o the crate

against the packing list attached inside each crate, and inorm

the nearest ABB representative i there is a discrepancy. Crate

damage may be a sign o rough transport. Immediately register all

claims regarding any visible damage to the crates or the contents,

as well as any shortages, with the carrier and the appropriateinsurance agent. In the event o damage, it is advisable to take

photos.

Caution!

Do not install or attempt to repair any transormer

showing visible damages.

Be especially observant o signs o oil leakage and insulator

damage, and that oil is visible in the oil level glass on the

transormer. Leakage must be immediately localized.

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Storage

The unit must be stored on a fat and stable surace with a suitable

load capacity, and i possible, in its original packaging.

Caution!

Transormers delivered in horizontal creates shall

always be stored with the same side up as when

delivered.

For extended storage, the contact suraces should be protected

rom corrosion. Beore placing in service, ensure that all contact

suraces are thoroughly cleaned.

I the unit is stored horizontally under unavorable climatic

conditions, corrosion can occur on secondary terminals and

accessories in the terminal box. This because drainage is

optimized or the upright position only. When stored horizontally,

the terminal box must be checked or condensation and

penetrating moisture. Beore long-term storage, appropriate

measures must be taken, such as connecting any available

heating elements, or placing silica gel or an equivalent drying

agent in the terminal box. This applies or storage o up to two

years. For longer storage o up to ve years, the transormer must

be stored indoors or under a roo. The maximum time or storagein the original crate without any protection is six months. I the

transormer is stored protected, make sure the building is very well

ventilated.

Caution!

Do not install or attempt to repair any transormer

showing visible damages.

For capacitor voltage transormers and coupling capacitors,

power losses may result rom capacitor components that have

not been energized or an extended period.. Ater connecting

the capacitors to the rated voltage, power losses will begin to

decrease. They will likely recover their original values ater a period

o continuous operation at rated voltage. Note that although the

trend o increasing power loss is counteracted ater a period o

time in operation, the site power loss measurements may still

show a slight discrepancy in relation to actory values due to the

much lower test voltage applied on site.

Note!

Horizontal creates can be stacked with maximum

three creates or transormers o system voltages up

to and including 362kV and two or system voltages

in the range o 420-800kV.

1 Example o a single unit packed using a horizontal single package | 2 Example o three units packed using vertical three pack

1 2

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8/488 IMB 36-800 kV | Manual

Saety notice

This current transormer should be installed within the designlimitations as described on the rating plate and in these

instructions. Follow your companys saety procedures.

This product is intended to be operated and maintained

by qualied persons who are thoroughly trained and who

understand the hazards involved. This publication is written

only or such qualied persons and is not intended to be a

substitute or adequate training and experience in saety

procedures or this device.

WARNINGDETAILED DESCRIPTIONS OF STANDARD REPAIR

PROCEDURES, SAFETY PRINCIPLES AND SERVICE

OPERATIONS ARE NOT INCLUDED. IT IS IMPORTANT

TO NOTE THAT THIS DOCUMENT CONTAINS CERTAIN

WARNINGS AND CAUTIONS REGARDING CERTAIN

SPECIFIC SERVICE METHODS THAT COULD CAUSE

PERSONAL INJURY TO SERVICE PERSONAL OR COULD

DAMAGE EQUIPMENT OR RENDER IT UNSAFE. PLEASE

UNDERSTAND THAT THESE WARNINGS CANNOT COVER

ALL CONCEIVABLE WAYS IN WHICH SERVICE, WHETHER

OR NOT RECOMMENDED BY ABB, MIGHT BE PERFORMED

OR POSSIBLE HAZARDOUS CONSEQUENCES OF EACH

CONCEIVABLE WAY, NOR COULD ABB INVESTIGATE ALL

SUCH WAYS. ANYONE USING SERVICE PROCEDURES

OR TOOLS, WHETHER OR NOT RECOMMENDED BY

ABB, MUST THOROUGHLY ENSURE ONESELF THAT

NEITHER PERSONAL NOR EQUIPMENT SAFETY WILL

BE JEOPARDIZED BY THE SERVICE METHOD OR TOOLS

SELECTED.

All inormation contained in this manual is based on the latest

product inormation available at the time o printing. The right

is reserved to make changes at any time without notice.

Delivery

Check the transormer or any transport damages immediately

upon delivery. Damage to packaging may be a sign o rough

handling. Note any damage (it is advisable to take pictures)

and contact the appropriate insurance company. Check the

transormer. Be especially observant o signs o oil leakage

and insulator damage and that oil is visible in the oil level glass.

Leakage must be immediately localized.

Liting the instrument transormer

Each package is delivered with detailed liting instructions that

must be complied with when liting. Any deviation rom theinstructions may harm the product. I the transormer is delivered

in the vertical position, be sure to careully read the instructions

since tilting the product may be harmul.

The detailed liting instructions can be sent separately i requested.

Please contact your ABB representative or urther inormation.

Caution!

The current transormer has to be placed in the

vertical position or at least 24 (36-550 kV) /

48 (800 kV) hours beore energizing.

Assembly

Each transormer should be checked or possible oil leakage,

porcelain damage and other damage caused by rough handling.

Check that the oil level is correct according to the maintenance

chapter. I not, careully check or possible oil leakage and contact

ABB or urther instructions.

Prior to assembly, ensure that the support structure is fat and

horizontal. I not, correct with washers. Deormation o the bottom

tank may otherwise occur and possibly lead to oil leakage and/or

insulator damage. The tolerance or fatness is 1.5 mm.

Connecting secondary terminals in the terminal box

The secondary terminals must be careully connected. There

are markings on the terminal block. There is a wiring diagram on

the transormers rating plate, inside the terminal box. Unused

secondary windings must be short-circuited over the respective

"end" terminals and connected to ground. Each unused

secondary winding must be short-circuited. Ground terminals are

located in the secondary terminal box.

Caution!

Never leave a secondary winding open. Very high

induced voltages occur between the terminals,

dangerous or both personnel and transormers.

IMB 36-800 kVInstallation

CAUTIONFOR YOUR SAFETYDO NOT ATTEMPT TO HANDLE, INSTALL,USE OR SERVICE THIS PRODUCTBEFORE READING THE INSTRUCTIONMANUAL.

Failure to read the instruction manual priorto perorming these actions can lead toserious injury and/or damage.

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Connection o ground terminals

As standard the transormer is delivered with a ground clamp

which is to be installed on one o the mounting pads or grounding

o the entire apparatus, see standard ground terminal in Figure 1.

In case the ground clamp is not installed on the mounting pad,

upon delivery, the ground clamp is ound inside the package.I

special, optional, ground bars are ordered, these are ound inside

the package. Make sure that the ground terminal, by means o

a separate conductor, is securely connected to ground. Also

make sure that the ground terminal is galvanically connected to

the mounting pad o the apparatus, in particular i the oil tanks

surace is painted or anodized. Note that the ground terminal canbe attached on at least two eet.

There are also ground terminals in the terminal box or connection

o appropriate winding terminals and cable screens.

Connection o capacitive tap

The capacitive terminal, i supplied, must be grounded to the

terminal box i not used.

1 Connection o standard ground terminal (other types can be supplied upon request when an order is placed)

Caution!

High voltages are present at the capacitive tap when

the current transormer is in service.

Connection o DDF tap

The DDF terminal, i supplied, must be grounded to the terminal

box when the current transormer is energized.

Caution!

High voltages are present at the DDF tap when the

current transormer is in service.

Tan- measurement

Beore energizing, a tan- measurement is recommended. This

measurement should be kept as a reerence or maintenance

measurements in the uture. Its important that the same test

equipment is used or each measurement. Instructions or

perorming the tan-measurement are provided in a later chapter.

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Connecting the primary terminals

Primary connections should be made so that static

mechanical loads on the primary terminals are minimized. This

is accomplished by using a fexible component, either in the

connector or in another part o the primary connection.

A rigid, non-fexible connection may result in oil leakage at the

primary terminals. All connections must be careully made.

A connection that is not properly tightened can cause overheating

and damage to the transormer. The maximum permitted static

test load is according to the dimensional drawing or all directions,

in compliance with IEC.

Each crate is accompanied with detailed assembly instructions

or primary terminals; see types in Figures 1-5. Careully ollow the

instructions to avoid damage to the unit.

IMB 36-800 kVInstallation

1 Connection or low current | 2 Connection or high current | 3 Connection or high current with both stud type and fag type shown | 4 Connection or

low current | 5 Connection or rated current

53

1

4

2

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IMB 36-800 kVMaintenance

Minimal maintenance is required due to the transormer being

hermetically sealed. A visual check is normally sucient

when the recommendation is to ollow the checklist at the

back o the manual.

Check or oil leakage at the ollowing positions:

- Oil level glass and oil lling plug

- Primary bushings

- Seals at top and bottom fange o the insulator

- Seal between the oil tank and lid

- Secondary terminal box bushing

- Oil drain plug

Transormer damage

Metal, porcelain and epoxy components are checked. Porcelain

components are cleaned as necessary.

Minor damage to insulator sheds can be repaired on site.

Instructions or repair o porcelain and polymer insulators can

be obtained rom your ABB representative. See the contact

inormation at the end o this document.

Oil level check

The let side o the oil level glass, located as shown in Figure 1,must always be dark, see Figure 2, at all ambient temperatures.

I the right side o the oil level glass is not completely black,

there is oil leakage. This should be localized and corrected as

soon as possible. When there is leakage, moisture can enter the

transormer.

Note!

The entire oil level glass must always be dark when

the transormer is in service.

Tan- measurement

Tan- measurements are recommended ater 1520 years oservice, but i high values are noted, measurements should be

made once yearly. Upon request, transormers can be supplied

with a capacitive voltage terminal or DDF terminal that is normally

grounded.

Caution!

High voltages are present at all unconnected taps

when the transormer is in service.

Oil sampling

Ater a longer period o service (1520 years) or i damage is

suspected ater or example, a major operational disturbance, an

oil sample can be extracted or testing o the oils moisture and

gas contents.

Oil lling

Oil may need to be lled when the oil level or IMB 36-170 is down

one liter, two liters or IMB 245-420 and more than three liters or

IMB 550-800. I oil needs to be lled, contact the manuacturer or

urther instructions. Contact inormation can be ound at the end

o the document.

2 Oil level glass indicating empty

1 Oil level glass location on the current transormer

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12/4812 IMB 36-800 kV | Manual

Oil sampling and oil lling must be perormed in dry weather

and with the transormer dry. The transormer must be taken

out o service and the transormer top must be grounded.

Transormers with coolers are sealed with an overpressure at

about +20C, and subsequently depressurized at about -10C.

Transormers with coolers or customers who have specied more

than +40C as the maximum ambient temperature are sealed

without overpressure at about 20C. Ensure that tools are at hand

beore beginning work.

Caution!Never open the oil plug on the oil tank when taking

an oil sample.

Note!

The transormer normally has a slight overpressure,

so be careul to avoid oil spillage when opening.

Preparation and inormation

Beore taking the oil sample, the ollowing should be checked:

- That the glass syringe is in proper condition, i.e. clean

and dry.

- Suitable tools are on hand or opening and sealing the

transormer.

- That a vessel or surplus oil is on hand to avoid spilling oil

onto the ground.

- It is recommended that a special oil sampling kit be

used, which can be ordered rom ABBs diagnostic

lab. Contact inormation can be ound at the end o the

document.

Using the syringe supplied by the manuacturer

The syringe supplied by the manuacturer has three valve

positions: closed, open through the hose and open to a side

outlet. The plunger may not be touched because o the risk o

drawing air into the syringe.

The syringe must be fushed with oil to ensure that the oil is

sampled and not mixed with air that is still in the hose. This is

done by extracting oil rom the transormer, which is emptied by

changing the valve position and emptying the syringe through

the side outlet. During the procedure, ensure that no gases are

extracted rom the transormer.

I a slight amount o gas has entered the syringe despite

preventive measures, hold the syringe upright and slowly press

out the gas with the plunger. I gases have been drawn into the

syringe, this should be noted in the report.

Submitting oil samples and reports

Mark the syringe with the transormers serial number and ll in the

report.

Return the syringes and the questionnaire in the transport box as

soon as possible ater sampling to the diagnostics lab, using the

delivery address stated in the end o the document.

Reports o analysis results and recommended measures are sent

by ABB within ten working days rom reception o oil samples.

Additional inormation concerning sampling or analysis results can

be obtained rom ABB Instrument Transormers.

Transormers with metal bellows, i.e. expansion chambers shaped

as cooling fanges, may not be opened because o internal

overpressure. Contact ABB AB according to the inormation

above or oil sampling.

Transormers with gas cushion

The transormers have an oil lling hole at the top o the expansion

chamber where oil samples can be taken, see Figure 1-5 on the

next page, depending on type o expansion system. To take an oil

sample on the current transormer, ollow the steps below.

- First open the oil lling cover.

Check the sampling syringe- Careully insert the hose into the oil lling hole. The hose

must be beneath the oil surace.

- Flush the syringe with oil rom the transormer and empty

the syringe according to the inormation above.

- Close the side outlet and ll the syringe again with oil

rom the transormer, taking care not to draw in gas. This

is the oil sample. Close the valve ater sampling.

- Clean the sealing suraces at the oil lling opening rom

spilled oil and oreign matter, and install new o-rings i

necessary.

- Seal the transormer at a torque o 25 Nm.

Caution!

The caption or Figure 1-5, on the next page,

describes which o the expansion systems are

testable or non-testable through the oil lling hole.

Transormers with test plugs or test valves

I an instrument transormer is supplied with a oil test plug or oil

test valve there is no need to open the transormer to take an oil

sample. Inormation on how to use oil test valves and test plugs is

provided in the optional accessories chapter.

IMB 36-800 kVOil sampling

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1

4

2

5

3

1 Expansion system with cooler (testable) | 2 Expansion system with cooler (non-testable) | 3 Expansion system without cooler (testable) | 4 Expansion

system without cooler (testable) | 5 Expansion system without cooler (testable)

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14/4814 IMB 36-800 kV | Manual

IMB 36-800 kVTan- measurement

Beore energizing, a tan- measurement is recommended.

This measurement should be kept as a reerence.

Measurement or maintenance measurements in the uture.

Its important that the same test equipment is used or each

measurement.

Conditions or measurements

Field measurements made at ambient air temperatures below

10C have proven to produce inconsistent results. Measurements

shall preerably be made at temperatures around 20C.

Field measurements shall preerably not be made with rated

requency to avoid disturbances. (Test equipment, such as DOBLEM 4000 that uses a test requency o 45-75 Hz, is available on

the market.) The relation between tan- at 50 Hz and the test

requency, or the range o interest or tan- = 0.5-1.0%, is

tan-50 Hz

=test

tan-test

/50, where test

is the test requency used.

When making eld measurements it is important to try to

estimate the temperature o the test object. One way is to

measure the secondary winding resistance, just beore making

the tan- measurement, and comparing with the value given at

room temperature in the routine test report or the transormer.

Alternatively, the current transormer can be let non-energized

until the internal temperature drops to the ambient temperature.(For IMB current transormers, this can be expected to take about

6-12 hours.)

The measurement can be made in dierent ways depending on

whether the current transormer is provided with a capacitive tap,

DDF terminal or without a special tap.

Current transormers equipped with capacitive voltage taps

It is recommended that measurements be made between the high

voltage terminals and capacitive tap, but measurements can also

be made between the capacitive tap and ground.

Measurements between primary terminals and capacitive

taps

- Disconnect the primary terminals rom the busbar.

- Measure the resistance o one secondary winding.

- Calculate the actual winding temperature, Ta, o

the winding as Ta= (R

a/R

o)(235-T

0)-235 where R

ais

the measured winding resistance, R0

is the winding

resistance measured in the actory routine test and T0

is

the temperature during the actory routine test.

- Check that one end o all secondary windings is

connected to ground.

- Connect the tan- bridge with A to the voltage terminal,B to the ground/guard terminal and C to the current

terminal o the test equipment as described in Figure 1

on the next page.

For measurements between primary terminals and capacitive

taps, a test voltage up to 10 kV can be used depending on the

test equipment.

Measurements between capacitive taps and ground

- Connect one o the primary terminals to ground.


- Calculate the actual winding temperature, Ta, othe winding as T

a= (R

a/R

o)(235-T

0)-235 where R

ais


is the winding


is




- Connect the tan- bridge with A to ground, B to ground/

guard and the current terminal and C to the voltage

terminal o the test equipment as described in Figure 1

on the next page.

Measurement between primary terminals to capacitive taps ispreerred, as this will provide inormation about the main part o

the insulation. Measurement between capacitive taps and ground

only provides inormation about a small part o the insulation. Test

voltages or measurement between capacitive taps and ground

must be limited to a maximum o 2.5 kV.

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15/48Manual | IMB 36-800 kV 15

1 Test setup when perorming a tan- measurement. Point A is the primary

terminal, B is the ground terminal and C is the capacitive voltage tap or, i

supplied, DDF terminal

Current transormers equipped with DDF terminals



- Calculate the actual winding temperature, Ta, o

the winding as Ta= (R

a/R

o)(235-T

0)-235 where R

ais


is the winding


is




- Connect the tan- bridge with A to the voltage terminal,

B to the ground/guard terminal and C to the currentterminal o the test equipment as described in Figure 1.

For measurement between primary terminals and DDF terminals,

a test voltage can be used o up to 10 kV depending on the test

equipment.

Measurements between primary terminals and ground.


- Isolate the transormer rom the metal structure to avoid

leak currents.


- Calculate the actual winding temperature, Ta, othe winding as T

a= (R

a/R

o)(235-T

0)-235 where R

ais


is the winding


is




- Connect the tan- bridge with A to the voltage terminal,

B to the ground/guard and the current terminal o the

test equipment as described in Figure 1. Note that there

is no C.

The test voltage or measurements between primary terminalsto ground can be 5 kV or 10 kV depending on the type o

equipment.

Test voltages must be limited to 22.5 kV i measuring between

capacitive taps and ground. For measurements between primary

terminals and ground or capacitive taps, a test voltage can be

used up to 10 kV depending on the test equipment.

A

B

C

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16/4816 EMF 52-170 kV | Manual

EMF 52-170 kVInstallation

Saety notice

This inductive voltage transormer should be installed withinthe design limitations as described on its rating plate and in

these instructions. Follow your companys saety procedures.

























SELECTED.




Delivery

Immediately check the inductive voltage transormer or any

transport damage upon delivery. Damage to packaging may be a

sign o rough handling. Note any damage (it is advisable to take

pictures) and contact the appropriate insurance company. Check

the transormer. Be especially observant o signs o oil leakage

and insulator damage and that oil is visible in the oil level glass.

Leakage must be immediately localized.




in the vertical position, careully read the instructions since tilting

the product may be harmul.



Caution!

The inductive voltage transormer must be placed

in the vertical position at least 24 hours beore

energizing.

Assembly











The secondary terminals must be careully connected. There are

markings on the terminal block. There is a wiring diagram on the

transormers rating plate, inside the terminal box. Each unused

secondary winding must be grounded at one point. Ground

terminals are located in the secondary terminal box.

Caution!

Never short circuit a secondary winding. Very high

current will occur between the terminals, dangerous

or both personnel and transormers.



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17/48Manual | EMF 52-170 kV 17















Neutral terminal

The transormer is equipped with an external, so-called neutral

terminal (N-terminal) on the primary winding. Check that it is

grounded to the grounding point in the terminal box.

Caution!

High voltages are present at the neutral terminalwhen the voltage transormer is in service.

Connecting the primary terminal

The primary terminal is secured to the bottom o the crate. For

horizontal transport, the terminal is placed under the insulator and

or vertical transport the terminals are secured beside the oil tanks.

Mount the primary terminal on the top o the expansion tank, see

Figure 2, with our M10 bolts and washers with a t ightening torque

o 45 Nm. Also mount other enclosed components, i any, such as

dampers, adapters etc. This can be done beore the transormer

is mounted on the support.

The primary connection should be made so that the static

mechanical load on the primary terminal is minimized. The

maximum permitted static test load is according to the

dimensional drawing or all directions, in compliance with IEC.

2 Assembly o primary terminal

1 Connection o standard ground terminal (other types can be supplied

upon request when an order is placed)

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18/4818 EMF 52-170 kV | Manual

EMF 52-170 kVMaintenance


hermetically sealed. A visual check is normally sucient

when the recommendation is to ollow the checklist at the

back o the manual.



- Seals at top and bottom fange o the insulator

- Seal between the oil tank and lid

- Secondary terminal box bushing

- Oil drain plug (i any)

Transormer damage





be obtained rom your ABB representative; see the contact

inormation at the end o the document.

Oil lling

Filling o oil can be necessary when the oil level in the transormer

is one liter low. I oil needs to be lled, contact the manuactureror urther instructions. Contact inormation can be ound at the

end o the document.

Oil level check

The let side o the oil level glass, located as shown in Figure 1,

must always be dark, see Figure 2, at all ambient temperatures.

I the right side o the oil level glass is not completely black,

there is oil leakage. This should be localized and corrected as

soon as possible. When there is leakage, moisture can enter the

transormer.

Note!

The entire oil level glass must always be dark when

the transormer is in service.

Oil sampling




gas contents.

2 Oil level glass indicating empty1 Oil level glass location on an inductive voltage transormer

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19/48Manual | EMF 52-170 kV 19




Caution!

Never open the oil plug on the oil tank when taking

an oil sample.

Note!

The transormer normally has a slight overpressure,

so be careul to avoid oil spillage when opening.




and dry.

- Suitable tools are on hand or opening and sealing the

transormer.

- That a vessel or surplus oil is on hand to avoid spilling oil

onto the ground




document.


The syringe supplied by the manuacturer has three valve

positions: closed, open through the hose and open to a side



The syringe must be fushed with oil to ensure that the oil is

sampled and not mixed with air that is still in the hose. This is

done by extracting oil rom the transormer, which is emptied by

changing the valve position and emptying the syringe through

the side outlet. During the procedure, ensure that no gases are

extracted rom the transormer.







report.






Additional inormation concerning sampling or analysis results can

be obtained rom ABB Instrument Transormers.

Transormers with gas cushions

The transormers have an oil lling hole at the side o the

expansion chamber where oil samples can be taken; see Figure 1.

To sample oil on the voltage transormer, ollow the steps below.

- First open the oil lling cover.

Check the sampling syringe.

- Careully insert the hose into the oil lling hole. The hosemust be beneath the oil surace.


the syringe according to the inormation above.






necessary.

- Seal the transormer at a torque o 25 Nm.

Transormers with test plugs or test valvesI an instrument transormer is supplied with a oil test plug or oil

test valve there is no need to open the transormer to take an oil

sample. Inormation on how to use oil test valves and test plugs is

provided in the optional accessories chapter.

EMF 52-170 kVOil sampling

1 Expansion system with exploded view o the oil lling cover

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20/4820 CPB 72-800 kV | Manual

CPB 72-800 kVInstallation

Saety notice

This capacitor voltage transormer should be installed withinthe design limitations as described on its rating plate and in

these instructions. Follow your companys saety procedures.

























SELECTED.




Delivery

Check the capacitor voltage transormer or any transport

damages immediately upon delivery. Damage to packaging may

be a sign o rough handling. Note any damage (it is advisable to

take pictures) and contact the appropriate insurance company.

Check the transormer. Be especially observant o signs o oil

leakage and insulator damage and that oil is visible in the oil level

glass. Leakage must be immediately localized.




in the vertical position, be sure to careully read the instructions

since tilting the product may be harmul.

CPB capacitor voltage transormers are transported in 3-pack

in the vertical position or, i ordered, in a 1-pack in the horizontal

position. I transported horizontally the unit is oriented with the

secondary terminal box acing upwards. In the case o double

terminal boxes, the additional box aces downwards. In the case

o upper capacitor voltage divider units, these are transported

exclusively horizontally in separate packages.

The magnetic transormer and capacitor voltage divider's bottom

unit are always delivered preassembled and may not be taken

apart. Top sections, i so equipped, are packed separately with up

to three sections in each crate.

Caution!

The supports mounted at the bottom o the

transormer are not to be removed until it has been

raised.



Caution!

The capacitor voltage transormer must be placed

in the vertical position at least 24 hours beore

energization.


The secondary terminals must be careully connected. There

are markings on the terminal block. There is a wiring diagram

on the transormers rating plate, inside the terminal box. Each

unused secondary winding must have one end grounded. Ground

terminals are located in the secondary terminal box.



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21/48Manual | CPB 72-800 kV 21

Caution!

Never short circuit a secondary winding. Very high

current will occur between the terminals, dangerous

or both personnel and transormers.

Assembly









insulator damage. The tolerance or fatness is 1.5 mm. I there is

an upper unit, it is careully placed on top o the bottom unit.

Note!

The same manuacturing number must be on the top

and bottom units.

The upper unit, i any, is secured with the supplied bolts and

washers, see Figure 1, at a tightening torque o 79 Nm or M12

bolts or 121 Nm or M14. The bolts are included in the delivery. I

the apparatus consists o additional units, repeat this procedure.


The primary terminal is secured to the bottom o the crate. With

horizontal transport, its placed in the package near the expansion

tank and with vertical transport at the bottom o the crate.

Mount the primary terminal on the top o the expansion system,

see Figure 2, with our M10 bolts and washers and torque to

45 Nm. Also mount other enclosed components, i any, such as

dampers, adapters etc. This can be done beore the transormer

is mounted on the support.

Connect the transormers high voltage terminal to the line,preerably with a fexible aluminum cable so as to minimize the

mechanical load on the primary terminal. The maximum permitted

static test load or all directions is according to the dimensional

drawing in compliance with IEC.

Low voltage terminal

The low voltage terminal, marked as L, is connected to the ground

upon delivery. Both the low voltage and chassis terminals are

accessible in the transormers terminal box. The cable between

the L-terminal and the chassis terminal must be disconnected

when carrier equipment is connected.

1 Assembly o upper capacitor stacks, i any 2 Assembly o primary terminal

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22/4822 CPB 72-800 kV | Manual















Use o special load in secondary circuit

I or any reason an intermediate transormer or other load with

an iron core is required in the capacitor voltage transormers

secondary circuit, it must be especially designed or this purpose.

Undesired sub-harmonic oscillations may otherwise occur. To

counteract this, the loads core must be designed to withstand at

least three times the rated voltage without becoming saturated.

CPB 72-800 kVInstallation

1 Connection o standard ground terminal (other types can be supplied upon request when an order is placed)

Adjustment windings and damping circuit

The damping circuit terminals d1-d2 and the adjustment windings

B1-B11 are located behind a sealed covering hood in the terminal

box.

Caution!

The warranty is breached i this seal is opened

without the consent o ABB.

The damping circuit has two bridged terminals: d1- d2. The

damping circuit is actory-calibrated to obtain optimal perormance

and normally no urther adjustment is needed. However, inparticular cases and ater agreement with ABB, this bridge

can be opened to check that the circuit is intact by resistance

measurement.

The CVT is delivered adjusted or a specied load and class,

and normally no urther adjustment is necessary. I needed, the

adjustment windings enable exchange o the capacitor voltage

divider on site, and readjustment o the transormer or the new

combination o voltage divider/electromagnetic units. A new

readjusted insertion block or the adjustment windings B1-B11

is supplied by ABB. The insertion block may only be replaced

ater agreement with ABB and ollowing the detailed instructionsprovided by ABB in order to retain compliance with requirements

or accuracy and loads.

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23/48Manual | CPB 72-800 kV 23

CPB 72-800 kVMaintenance


hermetically sealed. A visual check is normally

sucient with the recommendation o ollowing the checklist

at the back o this manual.



- Seals above and below the insulator

- Drain slots on expansion housing

- Seal between oil tank and cover

- Seal between cover and CVD

- Seal between terminal box and oil tank- Oil drain plug

Transormer damage





be obtained rom your ABB representative; see the contact

inormation at the end o the document.

Oil llingFilling o oil can be necessary when one liter o oil has been

extracted rom the EMU. I oil needs to be lled, contact the

manuacturer or urther instructions. Contact inormation can be

ound at the end o the document.

Tan-measurement (capacitor voltage divider only)

Ater a longer period o service (1520 years) or i a ault is

suspected ater or example, a major operational disturbance,

the tan- or the capacitor voltage divider can be measured

electrically. Note that the capacitor voltage divider consists o

one or more sections that cannot be opened. Consequently, oil

samples cannot be taken.

tan- is normally obtained in conjunction with capacitance

measurement. The value o the tan- varies with age, the test

method, the selected voltage level and temperature. An absolute

reerence value can thus not be provided. Consequently, the tan-

is primarily compared to previous values obtained with equivalent

methods and conditions so that any trends can be detected. It

is thereore helpul i one or more reerence values have been

obtained by measuring the tan- at an earlier stage, or example in

conjunction with commissioning, (rst energizing).

Oil level check o the electromagnetic unit

The electromagnetic unit is supplied with an oil level glass which isdesigned, as seen in Figure 1, with a black and an uncolored side.

The oil level glass must always be dark or electromagnetic units

designed as per Figure 2 at all ambient temperatures. I the oil

level glass is not completely dark, the transormer should be

checked or leakage and corrected as soon as possible. When

there is leakage, moisture can enter the transormer.

For electromagnetic units designed as per Figure 3, the oil

level shall always be visible in the oil level glass at all ambient

temperatures. I the oil level is not visible, the transormer should

be checked or leakage and corrected as soon as possible. Whenthere is leakage, moisture can enter the transormer.

Note!

The entire oil level glass must always be dark or

units as in Figure 2, or visible or units as in Figure 3,

when the transormer is in service.

Oil sampling (electromagnetic unit only)




gas contents.

1 Oil level glass indicating empty | 2 Oil level glass location on electromagnetic unit o type EOH | 3 Oil level glass location on electromagnetic unit o

type EOL or EOM

1 2 3

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24/4824 CPB 72-800 kV | Manual




There is an oil lling plug on the cover o the capacitor voltage

transormer's electromagnetic unit where oil samples can be

taken. Ensure that tools are at hand beore beginning work.




and dry.- Suitable tools are at hand or opening and sealing the

transormer.

- That a vessel or surplus oil is at hand to avoid spilling oil

onto the ground.




document.

- Replacement seals or oil lling plug are at hand.


The syringe supplied by the manuacturer has three valvepositions: closed, open through the hose and open to a side



The syringe and hose are then fushed with oil rom the

transormer oil lling plug; see either Figure 1 or 2 on the next

page. This ensures that the transormer oil is sampled and not the

oil mixed with air that is still in the hose. Careully pull the syringe

and check that only oil is drawn in. Fill the syringe with oil to fush

it. Change the valve position and empty the syringe through the

side outlet into the vessel or oil spillage without withdrawing the

hose rom the transormer.

Close the side outlet and ll the syringe again with oil rom the

transormer, still without drawing in air. This is the oil sample.





Taking an oil sample

To take an oil sample, ollow the steps below.

- First open the oil lling plug; see Figures 1 and 2 on the

next page.

- Check the sampling syringe.

- Careully insert the hose into the oil lling hole. The hose

must be beneath the oil surace.

- Take an oil sample ater pre-lling the syringe with oil

according to the instructions above. I a little air has

entered the syringe despite preventive measures, hold

the syringe upright and slowly press out the air with the

plunger. I air has been drawn into the syringe, note thisin the report.

- Close the valve ater sampling.



necessary.

- Seal the transormer with a torque o 25 Nm.

Transormers with test valve

I the instrument transormer is supplied with an oil test plug or oil

test valve there is no need to open the transormer's oil lling plug

to take an oil sample. Inormation on how to use oil test valves

and test plugs is provided in the optional accessories chapter.



report.






Additional inormation concerning sampling or analysis results canbe obtained rom ABB Instrument Transormers.

Capacitor voltage divider

The capacitor voltage divider, consisting o one or more sections,

may not be opened. Consequently, oil samples cannot be

taken. As an alternative to oil sampling, the tan- can instead be

measured in conjunction with capacitance measurement.

CPB 72-800 kVOil sampling

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25/48Manual | CPB 72-800 kV 25

1 Oil lling and sampling plug, see point one (1), on the electromagnetic unit o type EOM and EOL | 2 Oil lling and sampling plug, see point one (1), on

the electromagnetic unit o type EOH

1

2

1

1

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26/4826 CCB 72-800 kV | Manual

CCB 72-800 kVInstallation

Saety notice

This coupling capacitor should be installed within the designlimitations as described on its rating plate and in these

instructions. Follow your companys saety

procedures. This product is intended to be operated and

maintained by qualied persons who are thoroughly trained

and who understand the hazards involved. This publication is

written only or such qualied persons and is not intended to

be a substitute or adequate training and experience in saety




















SELECTED.




Delivery

Check the coupling capacitor or any transport damages

immediately upon delivery. Damage to packaging may be a

sign o rough handling. Note any damage (it is advisable to take

pictures) and contact the appropriate insurance company. Check

the capacitor. Be especially observant o signs o oil leakage

and insulator damage. Leakage must be immediately localized.

Instructions or repair o porcelain and polymer insulators can be

obtained rom ABB; see the contact inormation at the end o this

document.

Liting the coupling capacitorEach package is delivered with detailed liting instructions that

must be complied with when liting. Any deviation rom the

instructions may harm the product.

Top sections, i so equipped, are packaged separately with up to

three sections in each crate.



Caution!

The coupling capacitor must be placed in the verticalposition at least 24 hours beore energizing.

Assembly

Each coupling capacitor should be checked or possible oil

leakage, porcelain damage and other damage caused by rough

handling.


horizontal. I not, correct with washers. Deormation o the adapter

plate may otherwise occur and possibly lead to oil leakage and


The upper unit, see Figure 1, is secured with the supplied bolts

and washers at a tightening torque o 79 Nm or M12 bolts or 121

Nm or M14. The bolts are included in the delivery. I the apparatus

consists o additional units, repeat this procedure.


The primary terminal is attached to the bottom o the crate. With

horizontal transport, its placed in the package near the expansion

tank and with vertical transport at the bottom o the crate.



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27/48Manual | CCB 72-800 kV 27

Mount the primary terminal on the top o the expansion system,

see Figure 2, with our M10 bolts and washers at a tightening

torque o 45 Nm. Also mount other enclosed components, i any,

such as dampers, adapters etc. This can be done beore the

transormer is mounted on the support.

Connect the coupling capacitors high voltage terminal to the line,

preerably with a fexible aluminum cable so as to minimize the

mechanical load on the primary terminal. The maximum permitted

static test load or all directions is according to the dimensional

drawing in compliance with IEC.













Check that the ground-terminal is grounded when carrier

equipment is not used.

Maintenance

Minimal maintenance is required due to the coupling capacitor

being hermetically sealed. A visual check is normally sucient

when the recommendation is to ollow the checklist at the back o

the manual.


- Seals above and below the insulator

Tan- measurement

Ater a longer period o service (1520 years) or i a ault is

suspected ater or example, a major operational disturbance, thetan- or the coupling capacitor can be measured electrically. Note

that the coupling capacitor consists o one or more sections that

cannot be opened. Consequently, oil samples cannot be taken.

Tan- is normally obtained in conjunction with capacitance

measurement. The value o the tan- varies with, age, the test

method, the selected voltage level and temperature. An absolute

reerence value can thus not be provided. Consequently, the tan-

is primarily compared to previous values obtained with equivalent

methods and conditions so that any trends can be detected. It

is thereore helpul i one or more reerence values have been

obtained by measuring the tan- at an earlier stage, or example inconjunction with commissioning, (rst energizing).

1 Assembly o upper capacitor stack, i any | 2 Connecting the primary terminal | 3 Connecting the L/ground terminal (other types can be supplied upon

request when the order is placed)

1 2 3

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28/4828 Accessories | Manual

The surge arrester is mounted between the primary terminals

and can be supplied on IMB current transormers.Surge arrester

1 Surge arrester tted to the current transormer

A surge arrester is provided with IMB current transormers that

has a primary conductor o a multiple-turn design. The surgearrester is designed to protect the primary conductor against

induced overvoltages between turns. See Figure 1 where a surge

arrester has been assembled on a current transormer.

The voltage drop across the primary winding o a current

transormer is normally very small. At normal rated current, it

is only a ew volts. Special cases in this respect are current

transormers with multi-turn primary windings. The inductance

o a multi-turn primary winding is rather high and a surge current

passing through will cause a airly high voltage drop across

the winding. The voltage drop will not stress the internal high

voltage insulation, but may lead to insulation breakdown betweenadjacent turns in the primary winding. In order to protect the

current transormer, a surge arrester can be connected in parallel

to the primary winding.

Note!

Important or the unction o the surge arrester is thatit is correctly assembled according to the detailed

instructions enclosed in the crate.

Optional accessories

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29/48Manual | Accessories 29

The manometer is mounted at the top o the transormer

and i ordered prior to manuacture, can be supplied on IMB

current transormers and EMF inductive voltage transormers.Manometer

The manometer is provided with a quick release coupling and

delivered separately either inside the terminal box or in a separatebox at the same location as the transormer. The coupling on the

transormer is covered by a protective hood. See Figure 1 or an

example where the manometer is mounted on a transormer.

To connect the manometer to the transormer, rst loosen the

M8 bolts and remove the protective hood, then plug in the

manometer. To remove the manometer, pull back the locking

ring on the quick coupling. Slight oil spillage when removing the

manometer is normal. I the manometer is removed or a longer

period o time, the coupling on the transormer must be covered

by the protective hood. Clean the sealing suraces, check the

o-ring and replace i damaged. Mount the protective hood andtighten the M8 bolts to a torque o 22.5 Nm.

Current transormers with gas cushion type o

expansion systemA current transormer equipped with an expansion system o the

gas cushion type is delivered with atmospheric pressure, i.e. no

overpressure. A reading o zero on the gauge upon delivery is

normal. When the current transormer is in service at maximum

ambient temperature, the readings can by as high as 0.15 bar.

Current transormers with metal bellows type o

expansion system

A current transormer equipped with an expansion system o

the metal bellows type is delivered with an overpressure. The

overpressure depends on the temperature range the current

transormer is designed or (see rating plate). A reading o-0.25 bar to +0.5 bar is normal upon delivery. When the current

transormer is in service at maximum ambient temperature,

the readings can be up to 0.15 bar higher than on unloaded

transormers.

Manometer readings on inductive voltage transormers

An inductive voltage transormer equipped with an expansion

system o the gas cushion type is delivered with atmospheric

pressure, i.e. no overpressure. A reading o zero on the gauge

upon delivery is normal. When the inductive voltage transormer is

in service at maximum ambient temperature, the readings can be

up to 0.15 bar.

Caution!

To ensure that the manometer connection is not

damaged during liting, do not remove the protective

hood until the unit is mounted on the support

structure.

1 Manometer mounted on a current transormer

7/22/2019 Manual 1HSE96002-12


Anti-condensation heater can, i ordered prior to

manuacturing, be supplied on IMB current transormers,

EMF inductive voltage transormers and CPB capacitor

voltage transormers.

Anti-condensationheater

Anti-condensation heater is used to prevent condensation inside

the terminal box. The supply voltage or the heater shall be in therange o 220 V to 240 V AC at 50 Hz or 60 Hz. The power o the

heater is 30 W.

The temperature, which can be set in the range rom 0C to

60C, on the thermostat needs to be adjusted during installation

depending on the geographical location. The recommendation

is to set the temperature slightly above the daily average

temperature to achieve drying.

1 Anti-condensation heater mounted inside the secondary terminal box. Point one (1) is the terminal where the auxiliry power supply is to be connected,

according to the specication o the heater, point two (2) is the thermostat, point three (3) is the cable installed ater manuacturing and point our (4) is

the heater element.

Caution!

The surace o the heater element, see point our(4) in Figure 1, is very warm during operation.

The surace o the heater is warmer then the set

temperature at the thermostat.

Caution!

The heater works with ull eect i the temperature

inside the secondary terminal box drops below the

specied temperature on the thermostat. This results

in very hot surace.


7/22/2019 Manual 1HSE96002-12


The spark gap device is in the secondary terminal box and i

ordered prior to manuacture, can be supplied on IMB current

transormers.Spark gap device

It is a well known act that high voltages are induced i a current

transormer is operated with open secondary circuits. Themagnitude o the induced voltage depends on the size o the

magnetic core, the number o secondary winding turns and the

level o primary current during the period o time with an open

secondary circuit.

Beside the risk or injury to personal, the high induced voltage

may cause damage to the current transormer and the excitation

losses in the saturated core may create abnormal heating inside

the transormer.

Due to this, it must be clearly stated that operation o current

transormers with open secondary circuits is not permitted.

Overvoltage protection devices such as spark gap devices can be

used to limit the induced voltage.

It is important that the setting o the spark gap device is correct.

A voltage setting that is too low may cause malunctioning o the

protection relays. A voltage setting that is too high may cause

damage to the current transormer. The protective spark gap

devices are adjusted using a thickness gauge upon delivery to

3 kV. This results in a distance o 1 0.1 mm.

Adjustment at siteI the setting must be adjusted or or any other reason a check o

the adjustment becomes necessary, ollow the our steps below.

- I a protective spark gap device is mounted, see

Figure 1, start by checking the distance using a

thickness gauge.

I the distance is unsatisactory, continue with the

remaining steps.

- Loosen the nut shown in Figure 2.

- Adjust the spark gap by turning it clockwise to increase

the distance or counterclockwise to decrease the

distance. Use a thickness gauge to measure the

distance. Note that each millimeter corresponds toaround 3 kV.

- Tighten the nut.

1 Secondary terminal box supplied with spark gap devices, as

shown with point one (1) | 2 View o spark gap device

1

2

1

1

7/22/2019 Manual 1HSE96002-12


The oil test plug is mounted at the top o the transormer

and can be supplied i specied when ordering prior to

manuacture on IMB current transormers and EMF inductive

voltage transormers.

Oil test plug

Beore proceeding, be sure to read the oil sampling inormation

provided in a separate chapter or the pertinent instrumenttransormer.

To take an oil sample through the test plug (see Figures 1 and

2) a syringe is needed with a needle diameter o 1.1 mm and a

minimum length o 40 mm. The syringe can be ordered rom the

manuacturer.

Caution!

To avoid damaging the rubber in the oil test plug,

the needle must be careully pressed through the

membrane.

Note!

The rubber in the oil test plug has a service lie o

approximately 100 needle insertions.

To take an oil sample, ollow the below steps:

- Remove the protective lid; see Figure 1.- Loosen the bolt one turn only; see Figure 2.

- Careully press the needle through the rubber membrane

in the oil test plug; see Figures 3.


the syringe without removing it rom the transormer

according to inormation above.




- Remove the syringe and tighten the bolt.

- Clean up any oil spills and sealing suraces.

- Check the o-ring and replace i damaged.

1 Exploded view o the protective cover over the test plug | 2 Exploded view o the bolt removed rom the test plug | 3 Insertion o needle in the test

plug. The syringe shall be inserted with the opening upwards when pressed through the membrane o the test plug

1 2 3


7/22/2019 Manual 1HSE96002-12


Beore proceeding, be sure to read the oil sampling inormation

provided in a separate chapter or the pertinent instrumenttransormer.

The oil sample when the transormer is supplied with a test valve,

see Figure 1, is taken by ollowing the steps below:

- Loosen the two bolts (in some cases one) and remove

the protective hood; see Figure 1.

- Remove the plug rom the test valve; see Figure 1.

- Careully connect the equipment to the oil test valve.

Note that a tube nut, as seen mounted in Figure 2, is

needed or the connection with a thread diameter o

G3/8". This tube nut is normally not included.

- Open the screw on the test valve by turning it clockvise aquarter turn.


the syringe without removing it rom the test valve.

- Close the side valve and ll the syringe again with oil

rom the transormer, still without drawing in air; see

Figure 3. This is the oil sample.

- Close the valve on the syringe ater sampling.

- Close the screw on the test valve by turning it

anti-clockvise a quarter turn.

- Clean up any oil spills and sealing suraces. Ret the

plug. Do not over-tighten the plug; nger tightening is

enough or sealing.- Check the o-ring and replace i damaged.

- Mount the protective hood and tighten the M8 bolts to a

torque o 22.5 Nm.

1 Exploded view o test valve | 2 Nut connected to test valve | 3 Using the

syringe with the test valve

The oil test valve is mounted at the top o the transormer

and can be supplie

manual 1hse96002-12

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