Cable partial discharge location pointer
First Claim
1. A method for detecting the location of a partial discharge produced by an incipient fault in an insulated power line comprising the steps of:
- (a) applying an excitation voltage to a power line to produce a partial discharge signal pulse at an incipient fault along said power line;
(b) scanning the surface of said power line with two isolated axially spaced sensors disposed adjacent the surface of said power line, said sensors detecting said partial discharge signal pulse to produce discrete detected pulses which are transmitted to different input terminals of a differential amplifier;
(c) combining said detected pulses to produce a combined signal having an amplitude level that reaches an extreme value when said point of partial discharge produced by said fault is located equidistantly between said sensors; and
(d) moving said sensors along said power line and repeating steps (a) through (c) until the point of partial discharge provided by said fault is located substantially equidistantly between said sensors as indicated by said extreme amplitude level of said combined signal.
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Accused Products
Abstract
A method and apparatus for detecting the location of an incipient fault in an insulated power which includes the application of an excitation voltage to a power line to produce a partial discharge signal pulse at a fault along the power line. The surface of the power line is scanned with two axially spaced sensors disposed adjacent the surface of the power line, the sensors detecting the partial discharge signal pulse to produce discrete detected pulses. These detected pulses are combined to produce a combined signal having all amplitude level which reaches an extreme value when the fault is located equidistantly between the sensors. The sensors are moved along the power line until the fault is located substantially equidistantly between the sensors as indicated by the extreme amplitude level of the combined signal.
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Citations
23 Claims
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1. A method for detecting the location of a partial discharge produced by an incipient fault in an insulated power line comprising the steps of:
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(a) applying an excitation voltage to a power line to produce a partial discharge signal pulse at an incipient fault along said power line; (b) scanning the surface of said power line with two isolated axially spaced sensors disposed adjacent the surface of said power line, said sensors detecting said partial discharge signal pulse to produce discrete detected pulses which are transmitted to different input terminals of a differential amplifier; (c) combining said detected pulses to produce a combined signal having an amplitude level that reaches an extreme value when said point of partial discharge produced by said fault is located equidistantly between said sensors; and (d) moving said sensors along said power line and repeating steps (a) through (c) until the point of partial discharge provided by said fault is located substantially equidistantly between said sensors as indicated by said extreme amplitude level of said combined signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. Apparatus for detecting the location of a partial discharge produced by an incipient fault in an associated insulated power line comprising:
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(a) means for applying an excitation voltage to an associated power line to produce a partial discharge signal pulse at a fault along the associated power line; (b) means for scanning the surface of said associated power line including two spaced and isolated sensors adapted to be disposed in axially spaced relationship adjacent the surface of the associated power line, said sensors being adapted to detect the partial discharge signal pulses and produce discrete detected pulses; (c) means for combining said detected pulses including a differential amplifier with separate terminals for receiving and processing the signal pulses from said sensors, said means for combining said detected pulse functioning to produce a combined signal having an amplitude level that reaches an extreme value when the point of partial discharge produced by the fault is located equidistantly between said sensors. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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Specification