24/36kV級コイル駆動による熱パッファ形消弧室の遮断特性

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タイトル別名
  • Interrupting Capability of Thermal Puffer Chamber with the Arc-Driving Coil at 24/36 kV
  • 24 36kVキュウ コイル クドウ ニ ヨル ネツ パッファケイ ショウコシ

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The thermal puffer type GCB, which is expected to decrease the driving energy, has a good interrupting capability in the large current area. However, in the medium or small current area, its interrupting capability is lowered because the gas in the chamber is not sufficiently expanded and the minimum arcingtime may become longer.<br>To improve these properties, the authors investigated the interrupting capability of the thermal puffer method using the arc-driving coil which generates the magnetic field in the chamber. And the thermal puffer type GCB with the arc-driving coil, of medium voltage, having a good interrupting capability from large to small current areas, was successfully developed.<br>The investigation results are summerized as follows.<br>(1) The interrupting capability of the magnetic arc drive method is dependent on the chamber volume and the arc energy.<br>(2) Two types of the thermal puffer chamber with the driving coil are investigated. As for one type, having gas exhausting holes through the contact, its interrupting capability is dependent on the hole size, the coil shape and the chamber volume.<br>As for the other type, having the exhausting nozzle for expanded gas, it interrupting capability is dependent on both the magnetic drive effect and the thermal puffer effect.<br>(3) For getting a good interrupting capability at small current area, it is important to design the driving coil so as to generate bigger electromagnetic force just before the current zero.

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