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On an actual 550kV GIS (gas-insulated switchgear), the restriking surges of disconnecting switches at a high frequency of several MHz were successfully measured by employing two different methods. Further, by comparing the measured waveforms with waveforms obtained through calculations, it has been proved that restriking surge of disconnecting switches can be estimated by conducting calculations with considerably high accuracy. Also included, in this paper are certain suggestions regarding GIS simulation methods to be adopted for the calculations, while concurrently reported are the results of calculations on 111 circuit configurations at 10 different GIS's.

The Short‐circuit Testing Liaison (STL) is the organization that consists of high power testing laboratories of the world. Member laboratories perform short‐circuit tests under uniform interpretations of the IEC standards agreed through technical discussions and information exchanges among them. One of the recent projects that the STL has been working on is to establish uncertainty and traceability of high current measurement by international comparison tests with reference shunts. In concert with this project, the IEC Working Group is preparing the new standard for high current measurements. Copyright © 2007 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.

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