Vacuum switchgear

A technology of vacuum switch and vacuum container, which is applied in electrical switches, high-voltage/high-current switches, high-voltage air circuit breakers, etc., can solve problems such as increasing costs and complex detection circuits.

Inactive Publication Date: 2007-03-21
HITACHI IND EQUIP SYST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, when using this diagnostic method, since the discharge pulse used for diagnosis is a high-frequency signal, the detection circuit is complicated, and because a discrimination function for distinguishing electrical noise from the surrounding environment is required, the cost has to be i...

Method used

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Examples

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Embodiment 1

[0036] Embodiment 1 and Embodiment 2 have one thing in common, that is, the arc generated between the electrodes may touch the metal container 12 during the switching on and off operations, and the potential Ef of the metal container 12 at this time is equal to the system potential Ep. The occurrence of this phenomenon has nothing to do with the tightness of the vacuum pressure, so the diagnostic results when the action command is issued should be excluded.

[0037] Next, a third embodiment of the present invention will be described with reference to FIG. 10 .

[0038] The vacuum switchgear 100 has a vacuum tube 101 having cut-off and disconnection functions, and a vacuum tube 102 for grounding switching, both of which are cast by an insulator 20 having a grounded conductive coating 21 around it. Since the vacuum tube 101 has a disconnection function, it is desirable to exhibit a vacuum pressure diagnosis function while ensuring the safety of maintenance and repair personnel. ...

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PUM

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Abstract

The invention relates to a vacuum switch device, which reduces the cost and improves the reliability by simplifying the signal processing circuit of the vacuum pressure diagnosis device. The vacuum switching device is composed of a floating potential metal container (12), two insulating sleeves, and a pair of electrodes capable of contacting and separating. The measuring terminal (50) for vacuum pressure diagnosis is arranged opposite to the metal container (12). The metal container (12) and the measuring terminal (50) are casted by an insulator (20) such as epoxy, and the outer periphery of the insulator (20) is The portion is provided with a grounded conductive coating (21). Through the grounded conductive coating (21), the ground capacity of the metal container (12) is increased, so the potential of the metal container (12) during operation is close to the ground potential. When the vacuum pressure deteriorates, if a discharge occurs between the main circuit and the metal container (12), the potential of the metal container (12) is equal to the system potential, so it can be detected based on the potential rise of the system frequency occurring on the metal container (12). Deterioration of vacuum pressure.

Description

technical field [0001] The present invention relates to a vacuum switchgear, and more particularly to a vacuum switchgear equipped with a function of diagnosing vacuum pressure tightness during normal operation. Background technique [0002] The electrical resistance performance and shutoff performance of the vacuum switchgear depend on the pressure (vacuum pressure) inside the vacuum vessel. FIG. 9 is a so-called Paschen curve showing discharge characteristics in vacuum, showing the correlation between the product of pressure and distance and discharge voltage. As shown in the figure, when the vacuum pressure rises above a certain value, the insulation performance drops sharply. In the vacuum switchgear, in addition to breakage failures, there may be deterioration of the vacuum pressure due to long-term leakage of the gas medium, so periodic inspections are required. [0003] Generally, the way to detect vacuum pressure tightness is to take the vacuum switchgear out of th...

Claims

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Application Information

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IPC IPC(8): H01H33/66H01H33/668
CPCH01H33/668
Inventor 森田步佐藤和弘小林将人土屋贤治
Owner HITACHI IND EQUIP SYST CO LTD
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