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On the basis of statistical theory, a method to quantitatively determine the reliability of multi-parameter diagnosis and to optimize the algorithm of multi-parameter diagnosis is put forward. This method is based on the statistical law, and concerns correlation between the different parameters. Moreover, as an example, the stator bar of generator (300 MW, 18 kV) is studied. 30 samples were selected...
Light-emission of partial discharge (PD) was measured by photo multiplication tube (PMT) under AC voltage and simultaneously partial discharge magnitude was measured. Investigation of the correlation between them shows that the intensity of light emission is in proportion to PD magnitude but the ratio between them changes slightly with the aging time. Different voids were tested to study the influence...
Comparison study was carried out on the partial discharge (PD) behaviors in a void under AC voltages with square-wave and sine-wave. The transition of the PD magnitude with aging under square-wave showed the same tendency as that under sine-wave. Moreover, some distinctive characteristics of PDs under square-voltage (e.g. more than two pulses after the voltage rise time and their transition with aging)...
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