Method for measuring degradation level of transformer insulating

Details Method for measuring degradation level of transformer insulating Method for measuring degradation level of transformer insulating

1994-09-07

1996-04-16

Wieder, Kenneth A.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

324441, 324446, 324450, 324553, 324693, G01N 2740, G01N 2707

Patent

active

055086241

ABSTRACT:
A degradation level of transformer insulating oil can be checked by measuring leakage current of a sensor for measuring the degradation level of the insulating oil, in which DC power is applied to two electrodes of the sensor in the insulating oil for the transformer. In general, free carbons or nonsolute conductive particles are produced in the transformer insulating oil when used over long periods in the power transformer. The porous ceramic of the sensor for measuring degradation level of the insulating oil receives in the pores thereof the conductive impurity particles, and a conductive circuit is formed. Thus, this measurement for degradation level of insulating oil is based on the electric change states for the formation of the conductive circuit. Accordingly, by forming such structures, a method and apparatus for measuring degradation level of insulating oil by measuring leakage current of the sensor are provided. The degradation sensor can be used to measure the degradation level of insulating oil but also can be used to check the overload condition of a pole transformer. The potential level between the electrodes and occurring between the degradation sensors form a constantly rated load which can be measured by conversion into current.

REFERENCES:
patent: 3037164 (1962-05-01), Doble et al.
patent: 4646000 (1987-02-01), Wills
patent: 4849687 (1989-07-01), Sims et al.
patent: 5089780 (1992-02-01), Megerle
patent: 5175502 (1992-12-01), Rodabaugh et al.
patent: 5262732 (1993-11-01), Dickert et al.
patent: 5272444 (1993-12-01), Cox

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