Measurement system for partial discharges on dielectrics in coax

Details Measurement system for partial discharges on dielectrics in coax Measurement system for partial discharges on dielectrics in coax

1996-04-16

1998-12-29

Do, Diep N.

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

Of individual circuit component or element

324536, 324544, 324551, G01R 3102

Patent

active

058545565

ABSTRACT:
A method and apparatus for detecting partial discharges in cables and accessories. An electrical interruption is created in, for example, the sheath conductor of a cable, and the voltage of high frequency signal components, created by a partial discharge, is measured across the interruption. The interruption is short-circuited to allow low frequency signals to pass across the interruption, thus preventing low frequency signals from being measured. This is useful because the signal
oise ratio of the frequency range measured according to this invention is more favourable. Also, in order to properly and accurately measure a partial discharge, it is important to relate measurements to the main supply voltage of the cable. The present invention also provides a method wherein prior to display the signal is combined with a signal representing the main supply voltage.

REFERENCES:
patent: 3443158 (1969-05-01), Arndt
patent: 3524133 (1970-08-01), Arndt
patent: 4301399 (1981-11-01), Miller et al.
patent: 4779051 (1988-10-01), Grunewald et al.
patent: 4950957 (1990-08-01), Asars et al.
patent: 5323117 (1994-06-01), Endoh et al.
patent: 5359293 (1994-10-01), Boksiner et al.

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