Answer Posted / raj
before doing tan delta test, just we know that its for
determine the condition of insulation to the equipments.and
it has more benefits when compared to meggering(IR).megger
means to find insulation only behinds surface condition.but
for tan delta/dissipation factor/loss factor/power factor
is to determine internal void conditions, and their
capacitances.
permissible limits of tan delta for all bushings - 0.7%
then important one while testing of tan delta, we should
take the current test temperature, then correct that one to
20*c. . .
for that correction we should take the values from the
correction table that we do by using specific testing kit.
for megger make,doble,eltel we have different tables. just
refer and correct it.
impt: it will be compare with factory reports only after
correction of values to 20*c
Is This Answer Correct ? | 3 Yes | 1 No |
Post New Answer View All Answers
some time we open engine breaker 8.0 MW load but plant not trip. and another time engine open 4.0 MW load engine trip why? individually engine breaker open & individually emergency stop why difference?
what is meant by 3rd hormonics ?
What are the uses of stepper motor?
how to compute kAIC? with formulas...
What is the technical difference between On delay timer and a Star delta timer?
In electrical what is earth(ground)connection, wht is the importance of it, why it is recomended to maitain below 3VAC between Neutral and earthspecially in PLC used machines?
electrical knowelge
what is the difference between 50 hz freq. and 60 hz freq.? which is better and economic in them ?
A double circuit with dog conductor 66KV Transmission line from wind farm evacuation to feeding substation having capacity of 25MW for transmission. Can same transmission network be considered for further expansion of Power & how much in MW. If we need to expand next 10-15 MW more will there any augmentation is required in transmission network? Kindly reply asap.
from generating station If 400v LT line length is 1000m how much voltage is drop and how do i calculate it? which cable will be use for this line?
What is the use of lag compensator?
Define what is difference between fuse and breaker?
HOW TO SELECT THE COPPER CABLE SIZES OF MOTORS,TRANSFORMERS?
what is the difference between linear choke and suction choke?
What is an ac motor?