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PI testing on 13.8 kv motors

PI testing on 13.8 kv motors

PI testing on 13.8 kv motors

(OP)
Is there any value in doing a 5000 volt PI test on a 13.8 kv motor.  Even if the readings are trended?

RE: PI testing on 13.8 kv motors

I think if you are planning on trending the readings, the PI is more valuable than the 1 minute reading.

=====================================
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RE: PI testing on 13.8 kv motors

(OP)
My question was more along the lines of the value of voltage, 5000 volts 0n a 13.8kv motor.  

RE: PI testing on 13.8 kv motors

IEEE 95-2000 gives the following guidelines for test voltages:

VLL(vac)     Test Voltage (vdc)
====        =========
<1000       500
1000-2500   500-1000
2501-5000   1000-2500
5001-12000  2500-5000
>12000      5000-10000

5kvdc test of 13.2kv machine is consistent with these guidelines.  We use 10kv test at our plant. I don't think using 5kv would be a big problem (there may be slight tip-up if contamination is present).  Most important thing for trending is to use the same voltage each time.

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RE: PI testing on 13.8 kv motors

gronk2003:

See Thread " Generator PI Value Problem" 01/10/04 by edison123.

RE: PI testing on 13.8 kv motors

Suggestion: 5000VDC is sufficiently high to reveal insulation DC resistance. It is also sufficiently low for 13.8kV not to cause any damages to insulation. Contact the IEEE 95-2000 working group to find out all details behind the selected voltage.
http://www.ieee.org

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