Results 1 to 10 of 13
-
April 4th, 2019 09:53 PM #1
I couldn't find any guidelines on how to conduct IR test (Insulation Resistance) so I would like to make one specific for a 440V generator. I believe the procedure should be the same for 6.6 kV generator.
First step is lockout / tagout for the main breaker. Safety first for obvious reason.
Next is open the covers of the generator. Using a multimeter, make sure that you get zero (0) voltage across all lines.
Use a paint marker to label all wires and terminals like this.
Disconnect all wires. Again, make sure you have consistently labeled all wires and terminals.
-
April 4th, 2019 09:54 PM #2
Speaking of which, it will be better if you take a picture for an over all view like this then a detailed one. You don't want to mess up the connection.
Measure the ambient temperature and line temperature. This is for temperature correction at 20 degrees Celsius and can be useful as a reference in the future should you do IR test again.
Please don't follow these guys, they should be wearing coveralls.
Depending on the capacity of the generator, switch to 500V (or 1000V) as Test Voltage and start measuring the insulation resistance for each wire. Take note of the values as you'll be using these for calculating the Dielectric Absorption Ratio (DAR) and Polarization Index (PI).
After recording all values, it is time to put everything back to its place. Consult your instruction manual for the proper torque for the terminals. If it's not available, then use a Strength Grade of 8.8 for the torque value depending on the bolt size.
Get a piece of paper and start calculating the DAR and PI values together with the temperature correction.
That's it, you're done.
-
-
April 4th, 2019 10:29 PM #4
-
-
April 4th, 2019 10:31 PM #6
-
April 4th, 2019 10:33 PM #7
-
April 4th, 2019 10:35 PM #8
-
April 4th, 2019 10:35 PM #9
-
I dont know kung ano ang major contirbutor sa incident nayan. Dahil ba made in china yung ev car o...
Hybrids and EV