How to debug the wind resistance of a gasoline generator

What is IR test for field winding of a generator?

Field winding of a generator is a low voltage winding and hence not tested normally above 500 V for insulation resistance. There are different versions of minimum acceptable value of IR test for AC and DC armature and field windings. IEEE Std 43 recommends below formula for the minimum acceptable value of insulation resistance, Rm = kV + 1 Where:

What is a generator winding?

Generator windings are made from materials (usually Cu) whose resistance is dependent on temperature. Since the winding resistance test is a comparative method, the resistance values must be temperature corrected to a reference temperature to compare the results.

What is a DC winding resistance test?

The DC winding resistance test checks stator and rotor windings and all circuit connections.

How to measure winding resistance?

The usual procedure for winding resistance measurement tests is using DC current, waiting for resistance stabilization, and recording the resistance value. The resistance value is dependent on the winding temperature; therefore, it is necessary to correct the value to the reference temperature.

What should a generator operator do if a field winding is shorted?

Operators of generators should have the ability to perform on-line testing for field winding shorted turns and perform the testing periodically to develop trending information. Operators and service companies should also attempt to uncover the causes of shorted turns that have been found in order to prevent reoccurrences.

How accurate is a winding resistance test?

IEEE Std. 112-2017 requires the test device to have a valid calibration certificate within 12 months and minimum accuracy of ±0.2% of the full scale. When inspecting test results, winding resistance and behavior resistance in the test period should be analyzed (Figure 3).