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.

we have two generators different capacity on 15 MW and other 6MW at 11 KV , 15 MW gen. bus short level current 40KA,and 6MW short level current 25KA,, length of cable 100MTR between 6 MW from 15MW gen. for bus coupling . kindly tell any one can we use both NGR OR one NGR from any GEN. BOTH NGR has diff. rating. Tariq pakistan

0 Answers   RYK Mills,

how to measure genset CT coil range?

1 Answers  

What is UJT PNP, NPN transistor & working principles?

1 Answers   TATA,

what is reactive power (MVAR) and how it is control? how it is generate in powerplant?

1 Answers  

Why do we give DC excitation to AC Synchronous motor??

9 Answers   Lance, MBM, Polycab,

when generator of a power plant is not connected to grid , by increasing the mechanical torque speed of rotor increases but when it's connected to load instead of increase in speed current increases , why?

1 Answers  

What are the basic elements used for modeling mechanical rotational system?

0 Answers  

When do you use a VFD motor?

1 Answers  

Why we did not feel electric shock in electric train?

1 Answers   NTPC,

how to calculate the output power of vfd , please help me.

1 Answers  

Under wat condition statcom operates as an inductor for the transmission line?

0 Answers  

What is the difference between isolators and electrical circuit breakers? What is bus-bar?

0 Answers