Answer Posted / k.prakashchandra

LBB relay is for failure of breaker to trip , and back up protection relay ( usually EM ) is for failure of main relay ( usually electronic )

33kv substation lay out details & line to line & line to earth measurements

2613

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What is the difference between electronic regulator and ordinary rheostat regulator for fans?

1020

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What is the difference between relays and contactor construction wise?

2238

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in star-delta tranformer,if the input of star connection is 400/7v 3 kva then what is the output of delta connection?

2116

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Which level of the Transformer oil got dielectric strengh? And why?

2234

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234 MVA Generator 3 phase Short circuit current Values required? Gen set Rating-234 MVA, Gen Voltage-18kv, PF;0.8, Xdv:23.5 %, Transformer Rating-18/380KV, 680MVA,Yndd1 two winding, Step up TR, ZT:35.50 %,X/R 4.33 Gen CB Position, CB open ,Disconnected open, Generator Running Voltage 18 Kv, Bi mistakes generator side earth switch Closed during that time short circuit current level in 3 Phase required, and how to test on site 234MVA Generator Short circuit current,

2222

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how we can set the IDMT relay.

2209

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WHAT IS THE USE OF PIG TAIL IN WINDOW CT ?

2532

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Ac generato how produce power I need for camplet defination

1747

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Why electrical power generation and transmission done in 3 phase system not more than 3 phase ?

3061

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What are dcs and plc?

1099

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what happen as when voltage drop(or may decrease) ? in case of atomic base theory?

2020

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Why we use circular(Stepped) cross section in transformer core?

2245

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what is cause of static electricity? I experience shock when i touch metal equipment in a room ,furher check shows earth leakage showing 80ma at the DB near to the 400 MCCB?

1898

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how can we determine size of a cable by knowing the kw or current rating of a load?how can we calculate the resistance box of a slip ring motor?

1752

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