Answer Posted / vijaykumar shetye
A megameter, or a Megger as it is commonly called, is used
to measure the insulation resistance of cables and other
electrical equipment. The measured value is in mega ohms.
Hence the term Megger.
Most meggers generate 500 Volts DC supply, but their
current capacity remains low.
When the two terminals of a megameter is connected to
across the equipment to be tested, the high voltage gets
leaked into the equipment. The resistance is inversely
proportional to the current flowing through the equipment
under test.
Originally, most meggers were analog in nature, and were
generating high voltage using a dynamo, when the lever is
rotated at high speed.
Today most meggers available are digital, and can
generate 500 volts as well as 1000V. Some meggers have
winding resistance testing facility as well, and hence can
be used as a single tool to test the resistance of a motor
in ohms as well as in Megaohms.
Meggers used for checking high resistance like that of
mains transformrs, generate much higher voltages and are
generally analog type.
Is This Answer Correct ? | 113 Yes | 2 No |
Post New Answer View All Answers
I want to know all basics of electrical engineering
what are the dimensions for 200 kva transformer plinth (plateform),in which pcc m20 is used..
is it possible to start a motor in felid connected to a remote mcc
How can get elongation of 2 k.G aluminium, if elongated aluminium dia is 2.5 mm?
How to calculate loses in transformer of 160 KVA ?
how to calculate the size of the HT cable
Why do we avoid electrical conduits in floors at apartments?
What is hipot test procedure?
what is the calculation formula for motor starting torque,running torque, running torque.
Discuss the effect of sudden loading of an induction motor
How to control motor gearbox speed and friquency? If length of cable and dia given, how to measure the voltage drop?
why we use circuit breakers for switching instead of normal switching device?
why constant voltage transformer should be start without load? and if started then what will happen?
i want to know about torque of slip ring induction motor
how does a submersible pump work..?