I am involved in a generator development project. The development process involves preliminary testing on full coils in a test jig, followed by testing the completed generator. Obviously some time will elapse between the two. How reliable are the results of a power factor tip up/tan delta test performed on the test coils in predicting the performance of the completed unit? Both tests will be performed at 25% and 100% of line to ground voltage using the same (Doble) test equipment.
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