Mike Howell
EASA Technical Support Specialist
Insulation resistance (IR) testing is performed on rotating machines for several reasons including evaluation of condition, suitability for service and suitability for additional testing. IEEE Std 43-2000 provides the industry recommended practice. The insulation resistance is defined as follows:
R = E / I T
where
R is the IR in MΩ
E is the applied direct voltage in V
IT is the total resultant current in μA
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