IEEE 43-2000

[sngpl]

IEEE standard 43-2000 states that in order to avoid the effects of temperature in trend analysis, all tests should be corrected to a common base temperature of 40 degrees C using the following equation:

Rc = Kt * Rt

Where:

Rc is the insulation resistance corrected to 40 C
Kt is the insulation resistance temperature coefficient at t degrees C.
Rt is the measured insulation resistance (Mohm) at t degrees C.

My question is :

How do we know the value of Kt for a particular generator? I know we can calculate it by making measurements at several temperature and plotting the results on a semi logarithmic scale but I am afraid we have missed this opportunity as all of our generators are on bar at full load, being the peak flow season.

Any help shall be highly appreciated.
Thanks

 

[sngpl]

I finally found the answer to my question:

Kt= (0.5)^ ((40-t)/10))

where t is the actual insualtion temperature.

Thanks anyway!!