550kV変電所における過電圧測定装置の開発と適用

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  • Development and Application of Measuring System of Overvoltages in 550kV Substations
  • 550kV ヘンデンショ ニ オケル カデンアツ ソクテイ ソウチ ノ カイハ

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The automatic measuring system for transient overvoltages was developed and applied to the actual power stations and substations in service. The surge voltage sensor has the frequency bandwidth from 5Hz to 10MHz, and can measure all types of transient overvoltages such as the temporary overvoltage, switching surge, lightning surge and disconnector switching surge. This system was installed and now operating at three 550kV power stations and substations. Up to the present, 176 records were obtained for the first time with high accuracy. They include induced lightning surges, lightning back flashover surges, circuit breaker closing surges and a disconnector restriking surge.

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