Coupling capacitor Partial Discharge Coupling Capacitor - PDC series

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The PDC Series Partial Discharge Sensor-Coupling Capacitor is a sensor used for online and offline partial discharge measurements on rotating machines. Each sensor is a high voltage capacitor with an integrated quadrupole. Permanent or temporary partial discharge monitors can be connected via standard RG58 BNC cables to the couplers, usually by using a termination box in between. The PDC-1000 series has an integrated high voltage cable which will be connected via cable lugs to the high voltage busbars of the rotating machine to pickup partial discharge signals without any loss. A specially designed measurement impedance located in the base of the sensor allows to pick up partial discharge signals as well as the line frequency (1:2000). This allows us to transfer partial discharge signals and line frequency signal over the same cable to the partial discharge detector. The Signal output is protected via 90V surge arrestor. The shield of the coaxial output is capacitive floating to avoid eddy currents in the signal cables due to high magnetic fields. The frequency range that the coupling capacitor operates within is the combined result of the capacitance value and the impedance value provided by the quadrupole. – A high capacitance value (1000pF) results in a lower frequency range. – A low capacitance value ( 80pF) results in a higher frequency range.