Answer / nagendra

Whenever a fault occurs the circuit breaker trips.Reclosing of the breaker automatically when the fault on the system cleared is known as auto reclose system in circuit breakers

Answer / raul

basically there r 3 types of faults..... transient fault
(80%), semi-permanent fault (12%) and permanent faults
(8%). transient fault occurs only for a small duration, the
CB is opened for a short duration of time so dat d cause of
failure is cleared and the line is re-closed by closing the
CB. for semi-permanent faults which r basically due to a
twig falling on d line or a bird spanning around a
conductor.......the auto-reclosing after the cause is burnt
away.........and finally the permanent faults ie single
phase permanent fault n 3phase permanent fault.....for 1-
phase fault, the remaining two phases r operational n the
faulted phases is taken out for repairs n after d repair is
done the line is reclosed n for the other 3-phase fault,
the complete 3-phases r taken off for repair n after d
repair is done, all d 3-phases r reclosed

Answer / vinod

Auto reclose is using in transmission line circuit breaker
with selection of single phase, three phase or single and
three phase.

In transmission line there is chance of momentery fault,
based on the area and lenth the time and times of auot
reclose being selected.

Answer / tarun purohit

When any fault occures in line,the circuit breaker trips the supply off to the line.This is called the auto reclose system in Circuit breakers.

Which transformer is suitable for 220/11 kV, 60 MVA, distribution , Y-Y or D-Y or Y-D, give comparison for the same.

3 Answers  

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i have one transformer 1000kva, 11/.433kv. we are using 200/5 amp. ct unit for measuring purpose, & one 800 amp. V.C.B Unit for the same t/f operate, i wants to known the primary current of T/F is only 53 amp. why we used 800 amp. V.C.B ? & 200/5 amp. CT Unit.

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What is the ohms law?

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Which of the following are ill suited for energy efficient motors application?

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Why Aluminium wires are used for High tension(HT) lines? 11 KVA/32KVA & aboue

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what is the difference between upper impedance and lower impedance distance relay?

3 Answers   Havells, Power Grid,

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why in isolation transformer we dont get any shok?

2 Answers  

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Wat is power factor exact meaning in terms of technical terms plz explain ?

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plz explain the snubber circuit unit

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what is meaning of sympathetic tripping with respect to relays and give the values for current carrying capacities for copper and aluminium cables from 16sq mm to 500sq mm

1 Answers  

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