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Brochure THF 1 GB 99-031SCC330001C0201

Enclosed Third Harmonic FilterTHF Complete Sotutions

Low Voltage Products

2 Low Voltage Products

The Third Harmonic - a Growing Problem

Today's electrical networks and plants are undermuch more stress than a decade ago. One reasonfor this is the increasing use of electric equipmentwhich generate harmonics: in particular the thirdharmonic.

This harmonic can generate exceptionally highneutral currents which can often exceed even thephase current.

Equipment that generate harmonics:

• Fluorescent lighting systems• Computers• Welding equipment• UPS• Rectifiers• TV monitors• Microwave ovens

The Third Harmonic Causes Many Problems

Problems are directly related to the harmonic content. The third harmonic found in the phase current appearsneutral thus increasing the neutral current. See illustration on the next page.

In network:

• Overheating• Increased power losses• Poor quality of electricity• Electromagnetic fields• Malfunctions in earth fault control• Failure in remote control systems

In plants:

• Malfunction in electronics• Damage to capacitors• Power losses• Increased magnetic fields• Overload in neutral conductor• Cable fires• Abnormal temperature changes and noise in

transformers• Nuisance tripping in circuit-breakers

UPS

S01

057A

Low Voltage Products 3

1,00 0,40 0,00

-0,40

-1,00

L1

3.L1

1,00 0,40 0,00

-0,40

-1,00

L2

3.L2

1,00 0,40 0,00

-0,40

-1,00

L3

3.L3

N

1,00 0,00

-1,00

1,00

0,00

-1,00

L1L2L3

S00

248A

0,00 30 60 90 120

150

180

210

240

270

300

330

0,00 30 60 90 120

150

180

210

240

270

300

330

0,00 30 60 90 120

150

180

210

240

270

300

330

0,00 30 60 90 120

150

180

210

240

270

300

330

0,00 30 60 90 120

150

180

210

240

270

300

330

The Solution - The Third Harmonic Filter

The third harmonics are accumulated in the neutralconductor.

ABB Control Oy has developed a filter designed toeliminate the third harmonic.During the development process, there were manyindications proving that the third harmonic had anegative effect on the network.Once the filter is installed, machine interruptionsdecrease and process reliability improves.The filter also eliminates the harmonic in phaseconductors and power consumption is smaller.

The operation principle of THF is to convert theharmonic current into harmonic voltage, whichappear between phase and neutral. In TNS-systemit also appears between neutral and earth.

L1

L2

L3

N

PE

TNS

S00

250A

THF patented

application

• Increased efficiency in low voltagenetwork- Reduction in transmission losses- Increased loadability of the existing network

and switchboards- Lower temperature of cables, switchboards

and transformers- Elimination of third harmonic current in neutral

and phase conductor

• Increased efficiency in lightingappliance and pc-load- Less power or more lighting- Less maintenance- Longer life time of the lamps and capacitors

• More reliability in system- Reduced temperature of network devices- Increased maintenance intervals- Longer lifetime of the network

• Reduced Magnetic fields- The reduction of third harmonic component of

the current reduces the total magnetic field.- Picture example of the total magnetic field

spectrum typically in various locations.

Benefits of THF for lightingsystems and officebuildings

3,5

3

2,5

2

3,5

1

0,5

0Without THF With THF


Contents:

Third harmonic filter THF for transformer circuit in TNC and TNS-systems

• Installation of THF filter ............................................................................................. 6

• Selection of THF filter ................................................................................................ 7

• Protection unit ........................................................................................................... 8

• Ordering information .................................................................................................. 9

• Dimension drawing .................................................................................................... 9

Third harmonic filter THF for distribution boards in the TNS-system ...................... 11 - 15

Third Harmonic Filter THFFor Transformer Circuitin TNC and TNS-systems


TNS system

In TNS system it is advisable to install THF in transformer starpoint, see above.

It can be also installed in the neutral conductor, however the network must be a pure TNS-system. See "Third harmonic filter for distribution boards", pages 11...15.

TNC systemIn TNC system the THF filter is installed in the transformer star point. There must be noearthing between the starpoint of transformer and incoming terminal of THF filter.

Because of earthcurrent, THF filters

cannot be installed inthe PEN conductor of afour-conductor system.

Installation of THF filters in transformer circuitsin TNC and TNS-system

PENTHF

L1

L2L3

PEN

L1

L2L3

THF

S01

059A

Correct installation

Incorrect installation

PENTHF

L1

L2

L3

S01

065A


Earthing is allowedonly after THF filter.


The basis of dimensioning: The maximal asymmetrical current in N-conductor is 50 % of the rated current

THF filter is installed in the starpoint of the transformer. Type MJSTHF for outdoor andtype MNSTHF if for indoor use.

Transformer size Type Number ofSn/kVA In / A (400V) designation cubicles Use

315 460 MJS THF315B1 1 Outdoor useMNS THF315B1 1 Indoor use

500 720 MJS THF500B1 2 Outdoor use

MNS THF500B1 1 Indoor use









Selection of THF filters for transformer circuit inTNC and TNS -system

MJSTHF

MNSTHF

The MJSTHF and MNSTHF filter deliveryinclude protection unit (THF 1 S), by-pass-contactor and manual by pass switch.More information of the protection unit, seenext page.See ordering information in page 9.


THF I >K1

PEN

PEN

S00

985A

Test

I

O

230 VACN

PE3 X 1,5 mm2

PEN

10 A

N

PE

MAINDISTRIBUTIONBOARD

INPUT OUTPUTTRANSFORMER

L1 L2 L3N

THF( THFMNS )( THFMJS )

THF1S

PEN

PEN

S01

061A

N(PE)

THF filter in TNC- or TNS -system installed inthe transformer starpoint and equipped with aprotection unit.

THF

Strömberg Test

OKByPass

Test

RReset

0

12090

6030

50/60Hz Error

50/60Hz150/180Hz Error

150/180Hz

Aut

o

S01

068A

By-pass of the THF-filter with the by-passcontactor controlled by protection unit.

Protectionunit

Protection unit, includes the filter delivery

The protection unit is always used in TNC and TNS circuits when the THFfilter is installed in the transformer star point. The unit can also be used inTNS circuits when the THF filter is installed in the neutral conductor, see"Third harmonic filter for distribution boards", pages 11...15.

The protection unit is used to protect the THF filter in main circuits in TNC-system against 50 Hz fundamental unbalance currents and 150 Hz over-currents.

The purpose of a protection unit is• to limit a 50 Hz fundamental unbalance voltage drop to desired level• to prevent overload of THF filter• to go to by-pass state in case of network or internal failure.

The THF filter types THFMNS and THFMJS include the complete delivery ofthe protection unit with the by-pass contactor. More information for protectionunit THF 1_S , see brochure THF 2 GB.


Third Harmonic FilterTechnical Data, Dimension DrawingsOrdering Information

MJSTHF

MNSTHF

620600

2260

S01

066A

MNS THF

MJS THF

12

00

10

00

1050360

MJST2K

..

..

8

1020

280

Third harmonic filter in cubicles with protection unit for transformer circuit

For indoor use, include protection unit, by-pass contactor and manual by-pass switchCable entry from bottom. Option: cable entry from top, please change in type code B to T.For example: MNSTHF 315T1.

Transformer Number of Enclosure Type Order number Weightsize /kVA cubicles [kg]

200 1 IP 30 MNSTHF200B1 1SCA022542R0360 300315 1 IP 30 MNSTHF315B1 1SCA022575R5110 350500 1 IP 30 MNSTHF500B1 1SCA022575R4490 400630 1 IP 30 MNSTHF630B1 1SCA022575R4650 450800 1 IP 30 MNSTHF800B1 1SCA022476R7340 5001000 2 IP 30 MNSTHF1000B1 1SCA022575R4810 7501250 2 IP 30 MNSTHF1250B1 1SCA022537R1560 8001600 2 IP 30 MNSTHF1600B1 1SCA022531R2980 10002000 3 IP 30 MNSTHF2000B1 1SCA022575R4900 1300

For ourdoor use, include protection unit, by-pass contactor and manual by-pass switch

Transformer Number of Enclosure Type Order number Weightsize /kVA cubicles [kg]

315 1 IP 34 MJSTHF315B1 1SCA022580R2300 225500 2 IP 34 MJSTHF500B1 1SCA022580R2480 350630 2 IP 34 MJSTHF630B1 1SCA022580R2560 390800 2 IP 34 MJSTHF800B1 1SCA022580R2640 4601000 2 IP 34 MJSTHF1000B1 1SCA022580R2720 5201250 3 IP 34 MJSTHF1250B1 1SCA022580R2810 6701600 3 IP 34 MJSTHF1600B1 1SCA022580R2990 8502000 4 IP 34 MJSTHF2000B1 1SCA022580R3020 1010

Dimension Drawings

The dimensions are for one cubicle. For total width of THF filter, multiply the width by number ofcubicles.


Contents:

Third harmonic filter THF for distribution boards in the TNS-system

• Installation of THF filter ........................................................................................... 12

• Selection of filter ...................................................................................................... 12

• Guard unit ................................................................................................................ 13

• Connection examples .............................................................................................. 14

• Ordering information ................................................................................................ 15

Third harmonic filter THF for transformer circuits ....................................................... 5 - 9

Third Harmonic Filter THFFor Distribution Boardsin the TNS-system


The THF filter is installed in the neutral conductor. A filter is sized according to the distribution board or the fuse,which is supplying the group. The basis of the factory dimensioning of the filter is the fact that a filter installed inthe neutral conductor bears, in addition to the 150 Hz current, a 50 Hz component which may reach 100 % ofthe phase current (fully asymmetrical load).

The basis of dimensioning: Fully asymmetrical load.

Selection of filter for distribution boards in the TNS system

Size of THF Recommended cable size of neutral conducto r

feeding Q uantity & Type Neutral Cables betweenfuse conductor connection box and filter

in-out Cross section[ A ] Cross section

25 1 x THF 25NV 6 mm2 -

63 1 x THF 63NV 16 mm2 -

125 1 x THF 125NV 35 mm2 -

160 1 x THF 160NV 50 mm2 -

200 1 x THF 160NV + 1 x THF 63N 70 mm2 16 mm2

250 1 x THF 125NLV + 1 x THF 125N 95 mm2 35 mm2

315 1 x THF 125NLV + 1 x THF 125N 95 mm2 35 mm 2 +

+ 1 x THF 63N 16 mm 2

400 1 x THF 125NLV + 2 x THF 125N 150 mm2 35 mm2

500 4 x THF 125N + THF 1BV1 185 mm2 35 mm2

630 5 x THF 125N + THF 63N + THF 1BV1 2 x 95 mm 2 35 mm2

800 6 x THF 125N + THF 1BV2 2 x 150 mm 2 35 mm2

NPE

THF

L1

L2L3

S01

060A

NPE

THF

L1

L2L3

Correct installation


When the THF filter isinstalled in the neutralconductor, there can´t

be any connectionsbetween N and PE in

the loadside.

TNS systemIn TNS system the THF filter can be installed in the neutral conductor. The network must be apure TNS system. Fault current monitoring is recommended. Before the installation, the stateof TNS-system shall be verified by measuring the isolation resistance in the poles where THFis to be installed.It is advisable to install THF filter in the transformer star point even in TNS-system. In thatcase there is no 150 Hz voltage between N and PE. See installation of THF filter fortransformer circuits page 6.

Installation of THF filter for distribution boards

See page 15, parallel connection of third harmonic filters, connection examples.


The function is based on measuring the PE current in pure TNS -system. The factory setting value is in therange of 4...10A and can be adjusted with the monitoring relay.

Guard unit

THF in TNS-system equipped with a guard unit.Measuring in PE conductor.

L1L2L3

PEN

THF_NV

10A GUARD

S01

067A

L1L2L3PE

N

Load Load Load

Aut.

A %150Hz

ByPa

ss OK THF

1 3 5

2 4 6

13 21

14 22

Test

F1

Test

L1

I >t

1 3

2 4 R

Guard unit with bypass contactor in TNS- system

THF in TNS system with guard unit

The wiring diagram of guard unit

A THF filter shall be equipped with a fault current monitoring system, calleda guard unit, an economic way to improve the protection level of thenetwork in the TNS-system. Guard unit is used for supervising the networkcondition in TNS -systems.

The function is based on measuring the PE current. In case of the PEcurrent exceeding the set level (4...10A) the guard unit gives an alarm andcloses the bypass contactor of THF. The guard unit can be used with earthleakage systems. The guard unit do not substitute the earth leakageprotection, required in certain application. The earth leakage system do notsubstitute the guard unit.

• The guard unit is used for distribution boards in TNS circuits when theTHF filter is installed in the neutral conductor, see below, REMARK.

• The guard units are available either as inbuilt in the enclosed THF filter(types THF_ V) or inbuilt in the parallel connection box THF 1BV.The bypass contactor is included in above mentioned guard units.

• The guard unit is also available as a separate type THF 1V for remotemonitoring.

• The filter shall be dimensioned for full asymmetric load, see theprevious page.

THF

Strömberg

Test

Aut

OK

ByPass

Test

Reset

R

Test

Aut

OK

ByPass

Test

Reset

R

THF

S01

069A

L1L2L3

NPEN

THF THF1S

K1

10A

S01

062A

THF in TNS-system equipped with a protection unit.Measuring in PE and N conductors.

THF in TNS -system with protection unit

REMARKThe protection unit can be used instead of guard unit. It gives an additional protection against 50 Hzunbalance current. It also has selfsupervision. When the protection unit is ordered, the by-passcontactor and current transformer have to be ordered separately. Ordering information for protectionunit, see brochure THF 2GB.


L1L2L3PE

N

Load Load Load

THF

THF_N

Basic Connection

L1L2L3PE

N

Load Load Load

Aut.

ByPa

ss OK THF

1 3 5

2 4 6

13 21

14 22Te

st

F110A

Test

L1

1 3

2 4

R

K2

S1 S2

K11

S2 21

22

6

78

I >t

910

43

2

1

A1

A2K1

A1

A2K11

5

S1

1

2

THF125NLVTHF1BV1THF1BV2

THF25NVTHF63NVTHF125NVTHF160NV

L1L2L3PE

N

Load Load Load

Aut.

ByPa

ss OK THF

1 3 5

2 4 6

13 21

14 22

Test

Test

L1

1 3

2 4

R

K2

S1 S2

K1

S2 21

22

6

78

I >t

910

43

2

1

S1

5

F110A

Aut.

Test

1 3

2 4

RS2 21

22

6 7

4 3 2

1

S1

5

L1L2L3PE

N

Load Load Load

Aut.

ByPa

ss OK

1 3 5

2 4 6

13 21

14 22

Test

Test

L1

1 3

2 4

R

K2

S1 S2

K1

S2 21

22

6

78

I >t

910

43

2

1

S1

5

F110A

1234567

1234567

THF 1V THF _NV

THF

XX

ByPa

ss OK

Test

7x1,5mm2

THF_NV +THF 1V

Connection examples

THF with guard unit

THF with guard unit and guard unit box for remote monitoring


Third Harmonic FilterOrdering Information

THF

Strömberg

Test

Aut

OK

ByPass

Test

Reset

R

K

L

S

THF 63NV

THF

Strömberg

L

K

S

Test

Aut

OK

ByPassTest

Reset

R

175

250

100

X THF

34,5 Test

Aut

OK

ByPassTest

Reset

R

S00

641A

THF 1V

THF 1B

Connection example 1 Connection example 2

Connection example 3 Connection example 4

THF 125NLV THF 125N

THF 125N /THF 63N

THF 125N THF 125NLVTHF 125N THF 125N THF 125N THF 125N THF 125N THF 125N

THF 1BV2

THF 63NTHF 160NV

Enclosed third harmonic filter for TNS -systemOrdering information and technical data at ≤ 690V

Size of Connecting Dimensions Enclo- Type Order number Weightfeeding cable (Cu) (HxBxD) sure[A] [mm ] [kg]

Third harmonic filter with inbuild guard unit and bypass contactor (steel sheet enclosure)

25 6 400x250x180 IP 30 THF 25NV 1SCA022388R0700 19

63 16 600x400x230 IP 30 THF 63NV 1SCA022374R8260 43

125 35 1000x400x230 IP 30 THF 125NV 1SCA022374R8340 76

125 95 and 150 1400x400x230 IP 30 THF 125NLV 1SCA022378R6190 83

160 50 and 70 1000x800x230 IP 30 THF 160NV 1SCA022374R8420 110

Third harmonic filter without guard unit(can be used parallel with the THF_NV-types and with connection box THF1BV)(steel sheet enclosure)

63 16 600x400x230 IP 30 THF 63N 1SCA022325R0860 43

125 35 1000x400x230 IP 30 THF 125N 1SCA022325R1080 76

125 95 and 150 1400x400x230 IP 30 THF 125NL 1SCA022358R9010 83

160 50 and 70 1000x800x230 IP 30 THF 160N 1SCA022325R1240 110

Parallel connection box with guard unit and bypass contactor (steel sheet enclosure)

_ 185 400x800x230 IP 54 THF 1BV1 1SCA022383R7520_ 2 x (95…185) 400x800x230 IP 54 THF 1BV2 1SCA022383R7610

Guard unit box for remote monitoring (plastic enclosure)

1,5 250x175x100 IP 54 THF 1V 1SCA022374R8690

Parallel connection of third harmonic filtersTHF 125NLV includes space for parallel connection of several filters.

ABB OyLow Voltage ProductsP.O. Box 622FI-65101 VAASA, FinlandTelephone +358 10 11Telefax +358 10 22 45708http://www.abb.com/LVswitches

The technical data and dimensions are valid at thetime of printing. We reserve the right to subsequentalterations.

SYSTEMQUALITYCERTIFIEDSFS

ISO 9001

CERT

IFIED

ENVIRONMENTAL

SYSTEM

SFSISO 14001

ISO 9001 SFSBS 8800CER

TIFIED

OH

& S MANAGEMENT

-SYSTEM

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