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| Development of a 20kV Damped Oscillating Voltage Generator |
| Li Jing, Huang Feng, Guo Jinming |
| Guangxi Power Grid Electric Power Research Institute Co., Ltd, Nanning 530012 |
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Abstract This paper describes the design and development of a 20kV rated damped oscillating voltage (DOV) generator that can detect the partial discharge condition in 6/10kV power cables. A complete system using a novel high-voltage switch consisting of a series of connected insulated gate bipolar transistors (IGBTs) is designed and tested. The switch consists of 10 identical IGBT switch units, a multiple output isolated power supply system and a trigger unit. Physically, it is a 60cm diameter fan-shaped printed circuit board (PCB). To coordinate the various tested objects and to comply with the IEC 60060-3 standards, an air-core inductor is calculated to precisely fit the most general application conditions using the magnetic vector potentials method (MVPM). A laboratory prototype is assembled and tested. Waveforms illustrating the performance of the IGBT switch and the output of the DOV are presented. Finally, an application-oriented test demonstrates that the scheme can successfully complete the partial discharge (PD) test and PD location test for a cable sample.
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Received: 23 August 2016
Published: 24 August 2016
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2016, Vol. 17 
