Answer / rishi

first of all who told u that main and transfer bus is not used in 400 kv substation.This scheme is used in many substations.

Answer / naresh.devarakonda

one and half breaker scheme is more reliable, simple
operation and reduces the no. of isolators, bus.

Answer / furqan ahmad

in one and halfbreker scheme scheme both breaker and bus
maintenance is possible.even though this scheme is costly
as compared to other schemes but becoz of reliability and
redundancy it is usually used for 400 kv switchyard

Answer / jkrocks

DMT scheme is used earlier in 400kV System but all new 400kv ss are made on one & half breaker scheme. it has many advantages over DMT scheme.
more reliable than DMT each time line or ICT remain connected through both buses I & II, reduces numbers of confusing isolator in system, reduce additional bus.
If one bus trip due to any fault , lines are transformer connected to that bus remains charged through another bus by means of Tie CB.

Only disadvantage is that this system require three breaker for 2 lines or transformer.
But It is nothing against lots of advantages of One & Half Breaker Scheme.

Answer / teju

one and half circuit breaker scheme is more reliable than
other schemes, simple operation and reduces the no. of
isolators, some electrical parameters & it is easy to handle.

what are the ratings of sockets?

10 Answers   L&T,

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please tell me formula of 3 phase induction motor under condition{1]when we 3 phase motor starts without load in star or delta connection?thanks

1 Answers  

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what is the VA(Voltampire)? define with calculation?

4 Answers  

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what clearance required for 4.5 mva dry type transformer?

0 Answers   SPS,

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3phase 4 wire system is more reliable or 3 phase 3 wire systems?

4 Answers  

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what is the main function of lbb protection

3 Answers  

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what is the effect when the shunt field winding is opened in dc shunt motor (i) at the time of starting ? (ii) in running condition ?

4 Answers  

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What meant by XLPE cable

3 Answers  

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How to determine the breaking capacity such as break down current and break down voltage for VCB and CT's.

0 Answers  

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When the load on the system is zero and Capacitor bank is on condition, is capacitor bank takes any load?

2 Answers  

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Between AC generator(alternator) and DC generator which can be designed for high voltage and why?

1 Answers  

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Explain RLC circuit?

0 Answers  

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