| 摘要 |
PURPOSE:To detect the abnormal temp. elevation of a juncture of high voltage conductors and to prevent serious accidents by providing a vacuum vessel of which the outside surface is broken by a needle when it is buckled by a pressure rise near said juncture, and detecting the leaking sound of the gas sealed therein with an oscillation detector. CONSTITUTION:Gaseous sulfur hexafluoride 2 is packed in a sealed metallic vessel 1, and a vacuum vessel 5 having a needle 7 is placed near the tulip contact 3 of high voltage conductors 4, 4'. An oscillation detector 6 is fitted to the outside surface of the vessel 1. If with this constitution the contact between the contact 3 and the conductors 4, 4' goes defective, the pressure of the gas 2 is increased by the abnormal temp. elevation owing to an increase in the electric resistance of that part, by which the vessel 5 is buckled and deformed, then a hole is pierced by the needle 7 and through this hole the gas 2 enters the inside of the vessel 5 and produces the leaking sound which is detected with the detector 6. Thereby, the abnormal temp. elevation of the juncture is detected in an early time and serious accidents are prevented. |
