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04-07-2012, 02:14 PM
Post: #1
33/11 KV Sub Station
33/11 KV Sub Station

.ppt  3311 KV Sub Station.ppt (Size: 2.58 MB / Downloads: 1223)
Main Equipments in 33 KV Sub-Station

1) Power transformer
2) Circuit breaker
3) Isolator
4) Earthing switch
5) lightning arrestor
6) Busbar
7) Current transformer
8) Potential transformer
9) Protective relay
10) DC battery set
11)Capacitor bank
12)Fire fighting system

Power transformer

Transformer is used to step down the voltage from 33 kv voltage to 11kv voltage .
Generally 3.15 MVA, 5 MVA, 10 MVA 33/11kv, Δ / Y transformer are used in 33/11kv s/s.

Maintenance of Transformers

Check Oil level in main tank & OLTC tank.
Check the color of silica gel in breather ;it must be blue in color .if it is turned pink then recondition it or replace it.
Check On load Tap Changer Lower/Raise trail by Local & Remote.
Trip trail by draining oil in Buchholz relay
Check Earth resistance ,provide watering arrangement for earthling pits.
Tight all connections.
Check breakdown voltage of oil.
Clean the bushings.
Attend the oil leakages
Note Temperature of Oil & leakage.


It’s mineral oil obtained by refine crude petroleum. It serves the following purpose.
Provide additional insulation.
Carries away the heat generated in the core & coils.
Protects the paper from dirt & moisture.

Current Transformer

Current T/F is used for protection and metering purposes.
It steps down the current level of the line for following purposes.
1) Measurement : ammeter , kw meter , kwh meter , power factor meter
2) control and protection : current when exceeds the set value operates the relay which senses the faulty condition .

Potential Transformer (P.T)

It steps down the voltage level of line for -
1) Measurement : voltmeter, frequency meter ,kw meter, kwh meter ,power factor meter
2) Control & protection : used in directional over current protection and under frequency relay operation (48.8 Hz , df/dt relay)

Circuit Breaker

Circuit Breaker can switch automatically during normal and abnormal conditions . during faulty condition the fault is sensed by the relay and operates the circuit breaker to isolate the fault.
In 33kv substation generally vacuum circuit breaker are used where are quenching medium is vacuum

Advantage of Vacuum Circuit Breaker

1) no oil is required for are quenching
2) least maintenance
3) compact size
4) light in weight
Maintenance of circuit breaker
1) close/trip through local/remote control
2) trip trial through auto closer relay
4) oiling & greasing of moving parts
5) vermin proofing
6) heater healthy
04-10-2012, 10:54 AM
Post: #2
RE: 33/11 KV Sub Station
to get information about the topic " electrical substation" full report ppt and related topic refer the link bellow
05-02-2013, 10:12 PM
Post: #3
RE: 33/11 KV Sub Station
In 33/11kv substation each & every part(equiement) explian
08-05-2014, 10:59 AM
Post: #4
RE: 33/11 KV Sub Station
nyc work. goog afford here. very helpfull
09-05-2014, 11:24 AM
Post: #5
RE: 33/11 KV Sub Station
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