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AVTM21-415Ja Rev. A June 2005
10
APPLICATION NOTES
THEORY OF INSULATION TESTING
Any device that uses electrical energy can ordinarily be
considered as consisting of elements that may be classified in
two separate categories, namely, those parts of the apparatus
that conduct the electrical energy and those parts that are not
intended to conduct. It follows that any such apparatus
includes an insulation system that is not intended to conduct
electrical energy but which is under electrical stress. If such
insulating parts do become conductive, the apparatus will fail.
Electrical insulation can be tested by a variety of methods and
measurements may be taken to anticipate such failures. Each
method has its own merits, but one technique is to apply a dc
voltage to the insulation system and measure such quantities as
the applied voltage, the leakage resistance, and the manner in
which such quantities vary with time. These dc test techniques
have been well developed over many years and considerable
literature exists on this subject.
The few references given below are not presented in any
special order and no particular preference is implied; they are
included merely for the convenience of the user so that you
may make full use of this Megohmmeter test set.
The Lowdown on High Voltage DC Testing, Megger Technical
Publication AVTM22P-1
Fink, Donald G. and Carroll, John M.
Standard Handbook for Electrical
Engineers
(New York: McGraw-Hill, 1968)
Summary of Contents for ATEC 210415 Series
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