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COMMISSIONINGOFSTATION TRANSFORMER
By- P C Trivedi
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Healthiness check
Protection check
Insulation Quality of oil
Terminal connection
Cooling scheme
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When erection is completed do the following tests:
Inspection of Transformer
Ensure proper leveling & foundation
IR Values of Transformer & Cables
Protective Relays & their operation
Operation of associated switchgear
Ensure proper earthing
Ensure quality of oil
Charging of Transformer
No load operation
Full load operation
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Types of test conducted for transformer
TYPE TESTWinding resistance test Insulation Resistance test Polarity test
Short circuit testOpen Circuit testMagnetic balance test Vector group test
SPECIAL TEST High Voltage test Tan-Delta test
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DC SYSTEM COMMISSIONING
BATTERY CHARGER
BATTERIES
BATTERY CHARGING IN BOOST MODE
BATTERY CAPACITY CHECK
BATTERY TRICKLE CHARGING
DCDB CONNECTIONS
DCDB CHARGING
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LIGHTNING ARRESTER COMISSIONING
Check that erection work is complete as per relevant drawings and erectioncompletion certificate is available.
Check that no physical damage is apparent The insulator is clean The pressure relief device is ok The bolts-nuts & terminal etc. are tight No stain on corona rings The discharge counter advancement check Meggering tests are ok Insulation Resistance check for individual stack Resistance of ground connection
Leakage current test Note down initial counter reading during testing and before charging. Earthing to Surge Arrester is to be insulated from the structure.
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Bus Switching Scheme
&Layout of Switchyard
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PICTORIAL VIEW OF 400KV SWITCHYARD AT VSTPS
PICTORIAL VIEW OF 400KV SWITCHYARD AT
VSTPS
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BUS SECTIONALISER
MAIN BUS 1
MAIN BUS 2
TRANSFER BUS
BUS COUPLER
MAIN BUS 3
MAIN BUS 4
MAIN BUS 5
MAIN BUS 6
400 KV SWITCHYARD
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Transfer Bus
C.B.
LI
PGI
E/S
LA
GT
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LI
R
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Equipments provided in 400/132 KV
Switchyards
1.Circuit Breakers
2.Isolators
i)Line isolators
ii)Bus Isolators
3.Current transformers
4.Capacitive voltage Transformers.
5.Wave traps
6.Lightning Arrestors.
7.Relays
8.PLCC S stem
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10.Sequential Event Recorders.
11.Bus Conductors.
i)ACSR Moose Conductor, 54/7/3.53 (for 400 KV Bus)
ii)ACSR Panther Conductor 30/7/3.0 (for 132 KV Bus)
12.Shunt Reactors
13.Earth Switches
14.Earth conductors.
15.Compressors
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