why we are testing cables with DC supply not with AC supply?
Answer Posted / hashir
Insulation tests, known as megger tests, are carried out using DC because AC introduces reactance, mainly capacitive (AC resistance), into the readings.
The high voltage DC, usually twice the operating voltage, will break down any defective resistance in the insulation.
Is This Answer Correct ? | 2 Yes | 3 No |
Post New Answer View All Answers
how to prepare the technical test
why sielent pole is used only in hydro generators and not in turbo generators
armature winding of dc machine produce alternating emf then it convert in to dc by using commutator.But only we consider armature resistance why don't we consider inductive reactane effect?
can u please mail me the syllabus for GET exam for damodar valley corporation?
Parts of machine and their discription in details with suitable photo
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?
to vary valtage from 0 - max a variac is necessary . so how to design for high power applications nearly about 200KW power
Iin ESP why positive is grounded ? why not negative ?
send me all basic electrical question and answers
If a current -8+6sin6t is flowing three ammeter, one is a centre zero PMMC meter, one is true rms meter and one is moving iron meter. What are the reading of these three meter respectively?
what about SAP/MRP regarding manufacturing of electric motors and all drives?
what is the ckt diagram of a tubelight and is it the simplest ckt of electrical engineering and also the component?
What are the basic components of the feedback control system?
why would amp draw on neutral wire be as much as amp draw on the hot leg.
difference between the applicability of nortons and thevenin theorem