Apparatus for detecting position of internal fault of gas insulated bus

Claim 1

An apparatus for detecting the position of an internal fault of a gas insulated bus, comprising: electrodes provided in a tubular-shaped housing of said gas insulated bus, said electrodes positioned at arbitrary intervals from neighboring electrodes along the axial direction of said tubular-shaped housing, said electrodes for detecting a voltage induced within said housing by flashovers and corona discharge within said housing, wherein said electrodes are disc shaped and are mounted in respective cylindrical, gas-tight enclosures extending radially outward from said tubular-shaped housing, sensing surfaces of said electrodes being flush with, but electrically insulated from, an inner surface of said tubular housing; voltage measurement means which measure said electrode voltages thereat; and a processing unit responsive to outputs of said measuring means for identifying the position of the fault by comparing outputs from said voltage measurement means.

Claim 2

An apparatus for detecting the position of an internal fault of a gas insulated bus, comprising: electrodes provided in a tubular-shaped housing of said gas insulated bus, said electrodes positioned at arbitrary intervals from neighboring electrodes along the axial direction of said tubular-shaped housing, said electrodes for detecting a voltage induced within said housing by flashovers and corona discharge within said housing, wherein said electrodes are disc shaped and are mounted in respective cylindrical, gas-tight enclosures extending radially outward from said tubular-shaped housing, sensing surfaces of said electrodes being flush with, but electrically insulated from, an inner surface of said tubular housing; voltage measurement means which measure said electrode voltages thereat; and a processing unit responsive to outputs of said measuring means for identifying the position of the fault by comparing outputs from said voltage measurement means.

Claim 3

An apparatus for detecting the position of an internal fault of a gas insulated bus, comprising: an elongated tubular housing including a plurality of circular apertures space longitudinally along said housing; an elongated conductor located within said housing; insulating spacers spaced longitudinally along said housing and located between said apertures; voltage measurement electrodes spaced longitudinally along said housing and extending through said apertures in said housing and insulated from said housing for detecting a voltage induced within said housing by flashovers and corona discharges; and gas tight cylindrical housings extending radially outward from said tubular housing and having an open end extending into each of said apertures and having a closed end including a voltage terminal extending therethrough, each of said voltage measurement electrodes positioned within a corresponding one of said gas tight cylindrical housings and having a sensing surface flush mounted with, but electrically insulated from, an inner surface of said housing, said voltage measurement electrode being electrically connected to said terminal for sampling a voltage of said terminal.

Claim 4

An apparatus for detecting the position of an internal fault of a gas insulated bus, comprising: an elongated tubular housing including a plurality of circular apertures space longitudinally along said housing; an elongated conductor located within said housing; insulating spacers spaced longitudinally along said housing and located between said apertures; voltage measurement electrodes spaced longitudinally along said housing and extending through said apertures in said housing and insulated from said housing for detecting a voltage induced within said housing by flashovers and corona discharges; and gas tight cylindrical housings extending radially outward from said tubular housing and having an open end extending into each of said apertures and having a closed end including a voltage terminal extending therethrough, each of said voltage measurement electrodes positioned within a corresponding one of said gas tight cylindrical housings and having a sensing surface flush mounted with, but electrically insulated from, an inner surface of said housing, said voltage measurement electrode being electrically connected to said terminal for sampling a voltage of said terminal.