abu bakar baginda substation
TRANSCRIPT
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EET 3086 SWITCHGEAR AND PROTECTION 1
ABU BAKAR BAGINDA
Substation
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LIOW SER KHENG 1021179395
LIM WEI LIANG 1021125410 SIOW JATSHERN 1021115960
TAN CHEE SIANG 1021115778
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ABU BAKAR BAGINDA
Substation
132kV substation
Step down voltage to 33kV & 11kV and
distribute to consumer.
Getting generation supply from Serdang.
In all TNB substation, the 3 phase system isindicate by red, yellow, blue colour code.
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Substation Equipment
Bus bar
Generator
Transformer
Circuit Breaker
Isolator
Lightning arrester
Current transformer
Power transformer
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Bus Bar
This substation having 2 three phase bus bar which
are main bus bar and reserve bus bar.
The both bus bar are live.
The maintenance of the bus bar are done every four
years.
During maintenance one bus bar is shut down and
all the load switch to one bus bar only.
The bus bar rating that used in the substation is
3000A, 132kV.
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Surge/ Lightning Arrester
The one we see in the substation is valve-typelightning arrester.
It work as an insulator at normal system voltage but
it become a good conductor of low resistance to limitlightning voltage to a value lower than the basicimpulse level of the equipment being protected. Itre-establishes itself as an insulator after thedischarge of the surge current.
The rating for the lightning arrester is 20kA.
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Circuit Breaker
The one we see in the substation is sulphur
hexafluoride (SF6).
It only occupied small space. The circuit breaker rating for this substation is
1600A.
There is one coupler circuit breaker in this
substation and its rating is 3000A.
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Transformer
The transformer step down the 132kV to 33kV and11kV.
The transformer for stepping down 132kV to 33kV iswye-delta connected so it have a earthing
transformer. The transformer for stepping down 132kV to 11kV is
wye-wye connected so it no need the earthingtransformer.
The earthing transformer is the supply to the controlroom.
The rating for the 132/33kV transformer is 90MVAand the 132/11kV is 30 MVA.
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132KV to 33KV
132KV to 11KV
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Current Transformer
The current Transformer that we see in the
substation is oil-filled type.
The size is bigger than the circuit breakerwhich use the SF6 as the insulation.
The current transformer ratio is 1600:1.
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Voltage/ Potential Transformer
Voltage transformers are used to reduce the
system voltage to levels low enough to suit
the ratings of the protective relays. The rating of the voltage transformer used in
this substation is 132kV:110V
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Isolator/ Disconnector
Isolator is used to isolate the fault section.
It only can be open after the circuit breaker is
trips. If the isolator is open before the circuit
breaker is trip, it may cause fire in the
substation.
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Control Room
The control of the substation is done in this room.
The supply of the control room is come from theearthing transformer.
In the control room is consist many type of relaywhich used for the protection.
All the relay being used in this substation isnumerical relay.
The phase to ground fault is the most common faultin this substation.
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Transformer Protection
The transformer is control by the remote tap
changing control panel which is automated.
The transformer is protected using the transformer
differential protection scheme.
The back-up protection for the transformer is over
current protection scheme.
Since the primary protection is unit protection so the
back-up protection cannot be unit protection.
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Bus Bar Protection
The bus bar is being protected using the current
differential protection scheme.
Current differential is the unit protection which will
only detect the internal fault.
The current transformer ratio have to be choose
properly to avoid undesired trip due to the CT
saturation when there is the external fault.
The back-up protection is over current protection
scheme.
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Transmission Line Protection
The transmission line is being protected
using distance protection.
MHO relay is used for the distanceprotection.
Current transformer and voltage transformer
are needed in this protection scheme in order
to measured the impedance of the line.
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Circuit Breaker Tripping
For 132kV and below, 3-pole tripping method is inused and for above 132kV the single pole trippingmethod is in used.
This substation is using the 3-pole tripping method. This mean all 3 phase will be tripped during the
fault.
For 3-pole tripping it only need a circuit breaker but
for single pole tripping it need 3 circuit breakerbecause it need each for one phase.