Partial discharge detector for gas insulated apparatus
First Claim
1. A partial discharge detector for a gas insulated apparatus having a metallic vessel, which is filled with insulation gas and accommodates therein a high voltage conductor supported by insulating members, comprising;
- a signal receiving antenna unit formed by disposing two pieces of plate shaped conductive electrodes with a gap in the metallic vessel;
a coaxial cable coupled with said signal receiving antenna unit and electrically extending outside the metallic vessel through a hermetically sealing coaxial terminal; and
a measuring unit coupled with said coaxial cable.
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Accused Products
Abstract
Electromagnetic waves induced by a partial discharge which occurs at the time of internal abnormality of a gas insulated apparatus are detected by a compact antenna having a high detection sensitivity for a board frequency band.
With a circular signal receiving antenna unit 4 constituted by combining two piece of semicircular conductive plates on a plane in a metallic vessel 4 for the gas insulated apparatus, the electromagnetic waves due to the partial discharge can be detected with a high sensitivity for a board frequency band. The detected signals are measured by a measuring unit 10 via a hermetical seal coaxial terminal 7 and a coaxial cable 8. Further, the antenna portions of the semicircular plates are designed to extend a large area, a capacitance with a potential measurement portion can be increased, thereby a potential measurement with a high sensitivity can also be performed.
4 Citations
12 Claims
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1. A partial discharge detector for a gas insulated apparatus having a metallic vessel, which is filled with insulation gas and accommodates therein a high voltage conductor supported by insulating members, comprising;
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a signal receiving antenna unit formed by disposing two pieces of plate shaped conductive electrodes with a gap in the metallic vessel;
a coaxial cable coupled with said signal receiving antenna unit and electrically extending outside the metallic vessel through a hermetically sealing coaxial terminal; and
a measuring unit coupled with said coaxial cable. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification