we have taken HV test of 2.5 k and Megger test on 11 kv HT
cable.here it shows no fault but when we are charging the
same cable with 11 kv supply why the VCB 11 kv gets tripped
can anybody define the possible cause of fault ?
Answer Posted / shariff
The 11kV cable will be designed for morethan 12kV and the
megger applied voltage is just 20% of that rating.. so the
cable insulation might be withstanding at that vg but it is
failing at higher voltage.. So go for the Hi pot test with
DC pulse nearly 15kV...
Is This Answer Correct ? | 4 Yes | 1 No |
Post New Answer View All Answers
How to apply 'c' license and also explain what is difference between 'c' and 'b'license.i am also working in one of the private company.i have finished my diploma in 2014 .i have already finished in ITI electrician course.....
What is meant by derating factor?
How to calculate size of HT breaker with the help of Amp (current)? Please provide answers with examples.
What will happen if the d.c. Shunt motor opened accidentally running on no-load has its shunt field winding?
What are the roles and responsibilities of electrical engineer in cement plant
what is effect of leading power facter on the system and billing
how much UPS neutral erath leakage current.
Capacitor is load free component but why ampere meter shows current when capacitor bank breaker close?
what r substations?what r there work?why voltages r incresed and then reduced during distribution of power
all interview questions with answers of ntpc (2000-2009
How to check the LM324 Ic
What is the formula to calculate the rating of a three phase air circuit breaker
how can maintain the power factor and why and this is how do work tell us
how meger function
what is subtransient , transient and steady stateac components