Electricity: measuring and testing – Fault detecting in electric circuits and of electric components – Of individual circuit component or element
Patent
1986-08-26
1988-12-13
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Fault detecting in electric circuits and of electric components
Of individual circuit component or element
324522, 340647, G01K 3112
Patent
active
047913754
ABSTRACT:
An apparatus for detecting degradation of a grounded arrester, including a wave conversion circuit for producing an output signal corresponding to the total leakage current flowing through the arrester, and a phase shifter circuit coupled to the output signal for providing a capacitive-component leakage current signal, which is cancelled from the total leakage current signal by means of a differential amplifier to produce a resistive-component leakage current signal. According to one embodiment, this latter signal is applied to a synchronous rectifier circuit for synchronous rectification of the output signal from the differential amplifier circuit. A real resistive-component leakage current signal is then detected by adjusting the phase shift amount in the phase shifter circuit so that the output signal from the synchronous rectifier circuit may become zero, thereby bringing the phase of the cancelling wave signal in agreement with the phase of the capacitive-component leakage current signal. In another embodiment, the resistive-component current leakage signal is applied to a multiplier and a time averaging circuit, the output of which is likewise nulled by means of the adjustable phase shifter.
REFERENCES:
patent: 4142142 (1979-02-01), Arce
patent: 4259666 (1981-03-01), Takahashi et al.
The Central Institute of Electric Power Industry Research Report No. 183028, T. Yokokura et al, Jan. 1984.
Eisenzopf Reinhard J.
Kabushiki Kaisha Toshiba
Mueller Robert W.
LandOfFree
Apparatus for detecting degradation of an arrester does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Apparatus for detecting degradation of an arrester, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus for detecting degradation of an arrester will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2198335