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epri 93 - experience with on-line partial discharge testing of motors ...

epri 93 - experience with on-line partial discharge testing of motors ...

Figure 3 Pulse height

Figure 3 Pulse height and pulse phase analysis plots of A phase of an operating 6 MW stator. Six 80 pF couplers were mounted on the machine, three on the bushings from the generator to the isolated phase bus (Figure 4), and three in the PT/surge capacitor cubicle. Figure 5 shows the PD and noise activity. The external noise is relatively low, probably due to the surge capacitor which tends to short the external pulses to ground. The noise occurs over the entire ac cycle, whereas the PD, at least at high pulse magnitudes, occurs primarily between 0 o and 90 o or 180 o and 270 o , as is typical for PD. Thus, we have confidence that we are actually measuring PD, and not internal noise, for example from slip ring or shaft ground brush arcing. 8

Figure 4 Photograph of a capacitive coupler installed on the generator bushing on one phase 9

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