| 摘要 |
PURPOSE:To attain measurement at the time of supplying a large current or impressing a high voltage and to automatically monitor the electrified state of a specified contact part by measuring the state of a magnetic field generated near the contact part by electrified current. CONSTITUTION:A movable contact 1, a fixed contact 2 and electrostatic shielding parts 4, 5 are arranged in a stock tank and sulfur hexafluoride gas e.g. is sealed into the tank 3 with high pressure. A magnetic measuring sensor is fitted to the outer wall side of the tank opposed to the contact part of the contacts 1, 2 so as to be rotated in the peripheral direction to measure the intensity and distribution of a magnetic field. Thus, diagnosis can be attained also at the time of supplying a large current or impressing an high voltage and the electrified state of a specified contact part can be automatically monitored.
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