I am an electrical power engineer and arranged power system
for a data center, I installed MCB, ELCB and erthing system
TN-C-S.
But some times several ELCBs Disconnect circuits at the
same time! what may be the reason? (the ELCBs are 25A ,30mA)
Answer Posted / pillay
the choice of 30 ma is correct,
or in fact we should be able to
decide what ma rating we want
to choose where.
It could be the fault current was
quite big but fault current could
not be grounded fast enough resulting
in the current floating into other
neighbouring cct resulting in triggering
of the elcb,s.The other solution would
be checking the grounding connections from
the earth pit to upwards and also the actual
earth resistance measurements.
Is This Answer Correct ? | 0 Yes | 0 No |
Post New Answer View All Answers
i have applied for junior engineer 2 c&w for Guwahati RRB please send me last five year question paper
iam working in power plant. In hot places tube lights are glowing at the end portion only. what is the reason for that?
Explain how you intend to work under pressure to meet up with deadline target?
why is control bus bi-directional?
3- What is the target from Zero Impedance, Single Phase Imp., S/C Imp. and magnetic balance tests?
In India the supply voltage is 230 volt A.C. During the negative half cycle phase becomes neutral and neutral become phase? or what will happen during negative half cycle? how the electrons flow during positive and negative half cycle?
pre arcing time of ehv breaker
what is negative d.c. voltage, why this voltage is used in base transciever station.
What is the size of a 60 watt and 80 watt tubelight?
What are the different types of hydro schemes?
SIR, GIVE ME OPGW SAG CALCULATION FORMULA I AM DAE ELECTRICAL. THANKS
state the working of discharge lamp?
What is the formula to calculate distribution transformer De-rating on iron losses basis
i need about 10 years of GATE solved papers in pdf format and even mock tests toooo
1. If 8.35%Z means the percentage impedance of 132kV-line from power company, we will like to reconfirm its base capacity.