Partial Discharge and its Application to Gas Insulated Switchgear
Higher reliability is demanded with gas insulated apparatuses such as gas insulated switchgear (GIS) and gas insulated circuit breaker (GCB). Since gas insulated apparatuses are sealed structures, it is difficult to find internal defects from outside. Therefore, development of preventive maintenance techniques is necessary for GIS to prevent failures and to detect defects early. Detection of partial discharge (PD) is one effective means for this purpose1. PD signals in SF6, especially, have radio frequency components of high and wide bandwidth in the UHF region, which is more than a few hundred MHz. We have developed a UHF based GIS diagnostic system, which includes a neural network for improved and accurate fault assessment2.
KeywordsPhase Spectrum Partial Discharge Phase Pattern Spectrum Pattern Partial Discharge Pulse
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- 1.T. Yamagiwa, H. Yamada, F. Endo, Y. Oshita, S. Izumi and I. Yamada, Development of Preventive Maintenance System for Highly Reliable Gas Insulated Switchgear; IEEE Trans. On Power Delivery, Vo1.6,No.2, June (1991).Google Scholar
- 2.T. Kato and F. Endo, Development of UHF Insulation Diagnosis System of GIS; T. IEE Japan, Vo1.119-B, No.4, April (1999).Google Scholar
- 3.CIGRE TF 15/33.03.05, Partial Discharge Detection System for GIS: Sensitivity Verification for the UHF Method and the Acoustic Method, ELECTRA, No.183, pp.75–87,(1999).Google Scholar
- 4.T. Utsumi, F. Endo and T. Yamagiwa, Partial Discharge Diagnosis by Spectrum Analysis and Pulse-Phase Analysis, Proceedings of the 4 th Annual Conference Power & Energy Society (1993), LEE of Japan Paper No. 598 (in Japanese).Google Scholar