4.4 Step Voltage Test
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• The tester increases the test voltage
gradually and monitors the resultant insu-
lation resistance and leakage current.
• If the insulation resistance decreases as
the test voltage increases, the object
under test is damp or unclean and
requires attention.
(Reference standard
→
IEEE43-2000 Recommended Practice for
Testing Insulation Resistance of Rotating
Machinery)
• The test voltage is increased in 5 steps at
regular intervals during insulation resis-
tance measurement. The resistance mea-
surement and the current measurement
are acquired once at the end of every
step.
• The test voltage is applied in one of the
two orders below.
STEP2.50 kV: 500 V
→
1 kV
→
1.5 kV
→
2 kV
→
2.5 kV
STEP5.00 kV: 1 kV
→
2 kV
→
3 kV
→
4 kV
→
5 kV
• The voltage is increased when one
minute has passed at each voltage step.
4.4 Step Voltage Test
What is it used for?
Used to determine the effect of the
test voltage level on insulation resis-
tance of an object.
What is a step voltage test?
Overview of test
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