Method and device for detecting a partial discharge in an electrical device
AssigneeHitachi, Ltd.
InventorsToshiaki Rokunohe, Hirohiko Yatsuzuka
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Abstract
The present invention provides a method and device for detecting a discharge in an electrical device comprising, providing a bushing having a bottom lower flange and a top upper flange, providing a shield inside the bushing extending from the bottom lower flange to a position at least below the top upper flange and providing an antenna outside the bushing at least above the position for measuring an output signal from the device for detecting the discharge.
Claims26
A method for detecting a discharge in an electrical device, comprising the acts of:
- providing a bushing having an outside surface, a bottom lower flange and a top upper flange;
- providing a shield inside said bushing extending from said bottom lower flange to a position at least below said top upper flange;
- and
- providing an antenna at said outside surface of said bushing at least above said position for measuring an output signal from said device for detecting said discharge.
A method for detecting a discharge in an electrical device, comprising the acts of:
- providing a bushing having a bottom lower flange and a top upper flange;
- providing an outside shield for a gas circuit breaker adjacent said bushing;
- providing an antenna on a surface of said bushing in the vicinity of said outside shield at a position for measuring an output signal from said device for detecting said discharge;
- and
- said position being located above said bottom lower flange in a range of 3-20% of the distance between said bottom lower flange and said top upper flange.
A discharge detector for an electrical device, comprising:
- a bushing having an outside surface, a bottom lower flange and a top upper flange;
- a shield inside said bushing extending from said bottom lower flange to a position at least below said top upper flange;
- and
- an antenna located on said outside surface of said bushing at least above said position for measuring an output signal from said device for detecting said discharge.
A discharge detector for an electrical device, comprising:
- a bushing having a bottom lower flange and a top upper flange;
- an outside shield for a gas circuit breaker adjacent said bushing;
- an antenna on a surface of said bushing in the vicinity of said outside shield at a position for measuring an output signal from said device for detecting said discharge;
- and
- said position being located above said bottom lower flange in a range of 3-20% of the distance between said bottom lower flange and said top upper flange.
Dependencies are inferred from the claim text.