On 2nd till 14th June we have been transferred at substaton department under Pn.Rosilawati bt.Hussin.A few days here we learn some new things.We have been explain about :
There are 3 main compartments of a substation. They are:
a) Transformer
b) Switchgear
c) Low voltage distribution board (LVDB) or feeder pillar
a) Transformer
b) Switchgear
c) Low voltage distribution board (LVDB) or feeder pillar
I have explain a lot about transformer and feeder pillar in my previous blog.So I would like to explain about switchgear.Function of switchgear;
a) Received the 11kV and feed to transformer.
b) Isolate supply when it is needed
a) Received the 11kV and feed to transformer.
b) Isolate supply when it is needed
There are few types of switchgear:
a) Vacuum circuit breaker (VCB)
b) Ring main unit (RMU)
1) Oil insulated
2) Gas insulated
a) Vacuum circuit breaker (VCB)
b) Ring main unit (RMU)
1) Oil insulated
2) Gas insulated
vacuum Circuit Breaker (VCB) Switchgear
VCB is also called vacuum insulated switchgear. In TNB, types of VCB used are TAMCO, EPE and AICHI. VCB will trip if any fault occurred. VCB is used in important substation and in a row substation. 30 V dc supply from battery bank is used to operate the relay system of VCB. Normally VCB is used in Main Intake Substation (PMU).
The advantages of vacuum circuit breakers are:
a) Long life with minimum maintenance.
b) Compact, completely closed and sealed construction and can be used any orientation.
c) Extremely short and consistent arcing and total break times.
d) No fire risk and noise.
e) Suitable for very fast auto re-close as very little mechanical energy is required to operate them because of the much smaller contact separation.
Our new department
all the trainees and a "lecturer wanabe" :)
complete battery charger for the vcb ( vacuum circuit breaker )
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