allerection and precommissioning of switchyard equipments
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7/27/2019 Allerection and Precommissioning of Switchyard Equipments
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ERECTION AND PRE
COMMISSIONING TESTING
OF EQUIPMENTS
BY
Y.SURYA PRAKASA RAO
Chief Manager
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Receipt at site
After Receipt at site and before unloading
the materials ,the conditions of packing andrecord of the transportation shall be jointly
assessed by owner and contractor and dully
recorded.
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Unloading and storage at site
Unloading
Unloading of materials should be done withcrane of suitable capacity using polyester
slings only.
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Storage at site
Storage instructions should be followed strictly as
per storage instructions in equipment manual.
While shifting materials from storage place tofinal place for erection, sufficient care is to be
taken to avoid damage to the materials.
The material shall be opened after reaching
the place of erection .In case the material is found damaged during
storage and shifting. Inform supplier, erection
contractor and Insurance agency.
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Storage at site
LA should be stored vertically.
CVT should be stored vertically.
CT should be stored vertically or if it ishorizantal, keep around 30 degree height
at top side.
WT should be stored vertically.Store all equipments above ground level by
making platforms.
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ERECTION OF EQUIPMENTS
1. MEASURE FOUNDATION BOLTS DISTANCE &
LEVELING.
2. CHECK THE BASE PLATE HEIGHT WITH
EXISTING EQUIPMENT BASE PLATE.
3. CHECK THE LEVELING OF STRUCTURE AT TOP
WITH SPIRIT LEVEL AND TIGHT ALL NUTS &
BOLTS.
4. ERECT EQUIPMENT PREFERABLY WITH CRANEAS PER MANUFACTURER RECOMMENDATIONS.
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ERECTION OF EQUIPMENTS
5. ERECT THE CT PRIMARY POINTS P1 &
P2 AS PER DRAWING.
6. ERECT LAS BY KEEPING VENTSDIRECTION AWAY FROM EQUIPMENTS.
7. ERECT ISOLATOR EARTH SWITCH
POSITION AS PER DRAWING.
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PRE COMMISSIONING TESTS OF CT
1.POLARITY TEST.
2.MAGNETISATION CHARACTERISTICS OF CT.
3. RATIO TEST.
4.IR MEASUREMENT.
5. DGA TEST OF OIL.
6. TANDELTA & CAPACITANCE MEASUREMENT.
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PRE COMMISSIONING TESTS OF CVT
1.POLARITY TEST.
2. RATIO TEST.
4. IR MEASUREMENT.5. TANDELTA & CAPACITANCE
MEASUREMENT
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PRE COMMISSIONING TESTS OF SA
1. THIRD HORMONIC RESISTIVE
CURRENT.
2. IR MEASUREMENT OF INDIVIDUALSTACK.
3. OPERATION OF LA COUNTER.
4. TANDELTA & CAPACITANCEMEASUREMENT
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PRE COMMISSIONING TESTS OF
ISOLATOR
1. MILLIVOLT DROP TEST.
2. IR MEASUREMENT .
3. 50 OPERATIONS TEST.
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CONSTRUCTION FEATURES.
Circuit Breaker is an on load Switch
which can make & break load currents
and fault Currents in shortest time.
What it requires ?1.Support Structure.
2. Operating Drive Assembly.
3.Pole Column.
4.Interrupter.
5.Control Cubicle.
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SUPPORT STRUCTURE
Lattice structure or Tripod.
It carries the operating drive assembly,pole
column and Interrupter .It will stand on the concrete foundations.
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OPERATING DRIVE ASSEMBLY
It consists …
Pneumatic/hydraulic operating mechanism.
Compressor-motor/hydraulic pump.
Air-reservoir/ hydraulic reservoir.
Linkage mechanism.
Auxiliary switches.
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POLE COLUMN
It consists… Stacks of support porcelain Insulators to insulate the live
parts from the ground.
Operating rod(Insulating rod) with guiding rings transmits
movement from driving assembly to moving contacts.
SF6 gas .
Shaft seal assembly seals the SF6 gas.
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INTERRUPTER ASSEMBLY
Closing resistor assembly(optional)-400 ohms.
Grading capacitors(oil filled) -1200 PF .
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TESTS
Pre-commissioning Tests.
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PRE-COMMISSIONING TESTS
Pressure Switch settings of SF6 gas&Air/Oil.
Air/Oil Pressure drop tests during operation.
Air/Oil&SF6 gas Leakage tests in 24hrs.
Pole Discrepancy test for open/close.
Dew point & Air content tests for SF6 gas.
Milli volt drop test in close position.
Capacitance&Tan delta test for Grading Capacitor.Operation timings test.
Insulation Resistance measurement tests.
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ROUTINE MAINTENANCE TESTS
SF6 gas&Air/Oil Pressure Switch settings.
Air/Oil Pressure drop tests during operation.
Pole Discrepancy test for open/close.
Operation timings test.
Dew point for SF6 gas. (Two yearly)
Milli volt drop test in close position.(Two yearly)
DCRM & Contact Travel Measurement tests.(Three yearly)
Capacitance&Tan delta test for Grading Capacitor.(four yearly)
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OPERATION TIMINGS
•Close timings including PIR.
•Trip 1 timings .
•Trip 2 timings.
•Close Trip for both Trip 1 &2.
•Duty cycle operation times(O-0.3s-CO).
•Pole discrepancy time during open&close.
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ACCEPTABLE/PERMISSIBLE LIMITS FOR
MAINTANANCE TEST RESULTS.
•CB operation timings. 400kv 220kv
-Closing time(max) 150Ms 200Ms
-Trip time(max) 25Ms 35Ms
-Close/Trip time
pole Discrepancy
phase to phase(max) 3.33Ms 3.33Ms
Break to Break(max)of same phase 2.5Ms 2.5Ms
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•PIR TIMEBHEL make 12-16ms
CGL make 8-12ms
ABB make 8-10ms
NGEF make 8-12ms
M&G make 8-12ms
TELK make 8-12ms
ABB make(HVDC) 8-12ms
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•PIR opening time prior to opening of main
contacts(ABB.CGL.NGEF make CBx) . 5ms(min)
AT RATED PRESSURE
•PIR and main contacts overlap time(BHEL,M&G,ABB imported)make CBx). 5ms(min)
AT RATED PRESSURE
•TAN DELTA of grading capacitors 0.007degrees at 20deg.cel.
•Capacitance of grading capacitors within +10 of the rated value
within – 5
•Contact resistance of CB 150 micro-ohm
•Contact resistance of CB terminal
Connector 10micro-ohm per connector
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•IR value:
Phase earth 100m-ohm(min) by 5.0/10.0kvMEGGER
Across open contacts 1000m-ohm (min) by 5.0/10.0kvMEGGER
Control cables 50m-ohm(min)by 0.5kv MEGGER
•PRESSURE SWITCH SETTINGS
SF6 gas pressure switches within 0.1BAR OF SET VALUE
Operating air pr.switches within 0.1BAR OF SET VALUE
Operating oil pr.switches within 1.0 BAR OF SET VALUE
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DEW POINT OF SF6 GAS
Make of CB Dew point at Corresponding Remarks
rated pr. Dew pt.at atmo.pr.
BHEL -15deg.cel. -36deg.cel. During commissioning
-7deg.cel. -29deg.cel. During O&M
-5deg.cel. -27deg.cel. CriticalM&G -39deg.cel During commissioning
-32deg.cel. During O&M
CGL -15deg.cel. -35deg.cel. During commissioning
-10deg.cel. -31deg.cel. During O&M
ABB -15deg.cel -35deg.cel. During commissioning
-5deg.cel -26deg cel. During O&M
NGEF -15deg.cel -36deg.cel. During commissioning
-7deg.cel. -29deg.cel During O&M
-5deg.cel -27deg .cel. Critical
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