Answer / monty

LBB called as a line breaker back up protection and it is used for the saftey of our equipment whenever fault occurs on line than the breaker of uper stream will be open if lower stream breaker will not operated.

Answer / tpfasil200

Local breaker backup or breaker fail relay(LBB)..It is used when the trip command is given and the breaker fails to open due to some mechanical problem. The protection is time delayed and initiated by all trip conditions.On LBB operation, busbar protection is initiated, as all the breakers connected to that particular bus to which the circuit is connected have to be tripped.I t also trips the tie breaker and sends a direct trip command to the other end breaker.

Is RTCC panel needs any control supply.

0 Answers   HPCL, Schneider,

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Alternator couple to diesel engine why, Alternator couple to ac service motor with gear drive for 1500 rpm possible (yes or no) aim to low input power supply give to motor then high output power taken for alternator Please answer this question

1 Answers   Turbo,

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what is the difference between AHU and FCU .

1 Answers   JLL,

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hi guys please tell me the procedure for mesuring the coil resistance of 3ph induction motor?

0 Answers  

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What are the different types of cable jointing methods for HT and LT power cable?

1 Answers  

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how to calculate efficiency of voltage and current controlled welding transformer?

1 Answers  

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How many distance in distribution pole OR 33Kv line pole

2 Answers   Sail,

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there is an alternator 480 k.w, 400v,50hz, 4-wire running on load having leakage alternator body earthed current 38 A. is it within acceptable limit? if yes then give reference if no then how to bring within specified limit

0 Answers  

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What will happen if a dc source is given to a tubelight. Will it work or wont it work....

0 Answers  

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What is the difference between MCCB and MCB ?

4 Answers   Siemens,

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what is the maximum rating(KVA) of transformer can be used in distribution side..(11KV/440v) and why??

1 Answers   Jindal,

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why no load characteristics of generator also called as occ

1 Answers  

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