Method and apparatus for measuring deterioration of power cable

Details Method and apparatus for measuring deterioration of power cable Method and apparatus for measuring deterioration of power cable

1993-10-22

1995-11-21

Regan, Maura K.

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

Of individual circuit component or element

324541, 324544, G01R 3102

Patent

active

054690668

ABSTRACT:
A system for detecting a power cable for water treeing and other forms of deterioration based on the dielectric loss of the insulation of the cable. An AC test signal is injected to the conductor of a sample of cable to be tested. The voltage drop appearing across a resistor connected to the insulation shield layer of the cable is measured by means of a lock-in amplifier. A phase shifter adds to the voltage drop a voltage signal that is 180 degrees out of phase with the reactive component of the voltage drop. The output of the lock-in amplifier is the active component of the voltage drop that is representative of the dielectric loss of the insulation of the cable. This approach permits an accurate and reliable detection of trees even if they have not spread out evenly in the power cable, as distinct from the conventional tan .delta. method.

REFERENCES:
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patent: 5066920 (1991-11-01), Suptitz
patent: 5276401 (1994-01-01), Soma
patent: 5303164 (1994-04-01), Masson et al.

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