Abstract
A draft of a proposed standard procedure for corona tests on oil-immersed transformers is presented and some of the problems in the development of the test procedure are discussed. The IEEE Transformers Committee has approved publicizing the proposed test method which is based on radio influence voltage (RIV) measurements utilizing a radio noise (RN) meter coupled to the winding under test through a coupling capacitor or the capacitance tap of a bushing. A special tuned circuit is used with the bushing capacitance tap method to minimize attenuation of the RIV due to the ratio of the bushing capacitances and thus increase the sensitivity of the method. Problems requiring further study include: 1) selection of test voltage values, 2) terminal circuit connections for test voltage, and 3) the actual values of RIV permissible at the test voltages.
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