Gas-insulated electric apparatus and method of detecting partial

Electricity: measuring and testing – Testing potential in specific environment – Voltage probe

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174 11R, 174 28, 323364, 324133, G01R 3100, H02G 506, H01B 906

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active

042777461

ABSTRACT:
In a gas-insulated electric apparatus, such as a gas-insulated switchgear and a gas-insulated bus, having an insulating-gas-filled metallic container or sheath within which an electric conductor carrying a high-voltage current is supported by an insulating supporter, a potential detected by a first potential detector through at least a portion of the insulating supporter and another potential detected as a reference value by a second potential detector through an electro-static capacity disposed between the metallic container and the second potential detector are fed to the inputs of a differential amplifier of a partial discharge detecting device to thereby detect possible partial discharges along the insulating supporter with high sensitivity.

REFERENCES:
patent: 3652778 (1972-03-01), Sakai
patent: 3781454 (1973-12-01), Olsen
patent: 3869665 (1975-03-01), Kenmochi et al.
patent: 3949157 (1976-04-01), Billings, Jr. et al.
patent: 3962609 (1976-06-01), Chaudhuri
patent: 3988684 (1976-10-01), Muller et al.

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