新幹線切替開閉器電極間短絡故障に伴う回路現象解析と故障検出継電器の開発

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  • Analysis of the Phenomenon Associated with the Short Circuit of Shinkansen Changeover Switch and Development of New Type Protective Relay
  • シンカンセン キリカエ カイヘイキ デンキョク カン タンラク コショウ ニ トモナウ カイロ ゲンショウ カイセキ ト コショウ ケンシュツ ケイデンキ ノ カイハツ

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At substations or sectioning posts of Shinkansen, a pair of single-phase power sources are provided in different phase. When a Shinkansen car passes the boundary between the two power sources, the changeover section (about 1km long) with a pair of vacuum changeover switches the power sources for the car instantly.<br> There were no ways to detect the flashover of vacuum switch used as a changeover switch before, so we wasted a long time sometimes to specify the fault reason.<br> We analyzed the fault current carefully, to find the facts:<br> When the changeover switches are normal, a current flows through only one switch.<br> When the fault occurs on a changeover switch with no cars in the changeover section, fault current flows through both switches to make the currents in the two switches the same.<br> When a fault occurs on a changeover switch with a car in the changeover section, both fault current and load current flow. In this situation the currents in the two switches are different.<br> Then we have developed a new type protective relay for Shinkansen changeover switches based upon the facts. This relay has a pair of over current detectors with a pair of optical current transformers to detect the current in each changeover switch. When it detects the over current of both switches, it can judge that a flashover has occurred in one of the changeover switches.

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