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The instruments offer two voltages: 500V and 1kV. For windings rated over 5kV, an additional
megger tester with higher voltage will be needed according to the guidelines above.
The standard also recommends minimum insulation resistance value at 40
o
C as shown below.
“kV” is the rated line to line rms voltage of 3 phase motor, line to ground voltage of single-phase
motor, or rated DC motor voltage.
Note: The IEEE guidelines above provide the recommended voltages and Minimum Insulation
Resistance to ground values. If these procedures or values differ from your equipment
manufactures’ recommendations, follow their guideline.
Dynamic Testing - DYN
Dynamic tests are patented test methods that refer to the deenergized motor tests which are
performed while the squirrel cage rotor of an induction motor is manually rotated. The dynamic
test sequentially performs tests on all three phases of the stator windings and develops a “Test
Signature” of both the rotor and the stator which are then analyzed to provide immediate
results as to the condition of the rotor and the stator of three phase squirrel cage induction
motors.
Dynamic tests need to be performed directly at the motor. Testing from the
starter or motor drive can introduce external sources of interference that can
adversely influence the test results.
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