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High-frequency current transformer (HFCT) sensors are widely used for partial discharge detection due to their versatility, high sensitivity, and wide bandwidth. This paper reports on a finite-element analysis (FEA) methodology that can be employed to optimize HFCT performance. The FEA model consists of accurate 3D representations of the sensor components. Two different FEA software modules were used...
This paper considers the measurement and propagation of partial discharge pulses on distribution class power cable circuits, with the idea of attempting to determine discharge location sites on cables based on the parameters of individual pulses. Single-ended discharge location techniques based on partial discharge pulse parameters and shape will not be as accurate as time-domain reflectometry methods...
The technique of controlling neutral voltage and current is applied in medium- and high-voltage electricity networks as a means of eliminating earth fault currents. The complete compensation of earth fault currents is achieved using modern power electronics developed by Swedish Neutral. The GFN Ground Fault Neutralizer uses beside traditional Petersen Coil technology a novel Residual Current Compensator...
The authors present a paper on the application of online partial discharge (PD) testing and monitoring technology for the insulation condition assessment of in service medium voltage (MV — 3.3kV to 45kV)) and high voltage (HV — 66kV to 750kV) cables and plant. The paper begins with a short summary of the different economic ‘DRIVERS’ which apply to both public utility and industrial HV networks. The...
This paper describes the development and deployment of new portable on-line partial discharge (PD) monitoring devices for the condition monitoring of medium voltage (MV) cables and switchgear. In order to provide a complete MV network monitoring solution, devices for monitoring of PD at both primary and secondary substations are necessary. The authors describe the technologies and methodologies which...
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