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Partial discharge (PD) measurement is a fundamental tool to evaluate the state of apparatuses of medium voltage (MV) power systems. An alternative to traditional PD sensors (e.g. current transformers, capacitive couplers) for online measurements can be constituted partly by electromagnetic field sensors, capable to pick up the signals generated by PD occurring in the insulation system and traveling...
The authors have developed digital instrumentation that can measure the amplitude, shape, phase, and number of pulses per cycle. Examples are given of results obtained from an induction motor, a hydrogenerator, a polymeric cable system with a defective joint, and a high-voltage current transformer.
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