Patent
Apparatus for and methods of monitoring partial discharge in high voltage electrical equipment
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TLDR
In this paper, the authors present an apparatus for continuously monitoring partial discharge in high voltage electrical equipment to give advance warning of impending breakdown of solid-insulated components (e.g. capacitors 11 to 16).Abstract:
In apparatus for continuously monitoring partial discharge in high voltage electrical equipment thereby to give advance warning of impending breakdown of solid-insulated components (e.g. capacitors 11 to 16), means are provided to distinguish electrical signals indicative of partial discharge from those resulting from noise or external transients. Current pulses in the various partial discharge paths are detected by detectors (21 to 26), and by means of solid-state circuitry (40, 41) their relative polarities are compared and an appropriate signal is made according to the comparison.read more
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Patent
A device for sensing of electric discharges in a test object
Tord Bengtsson,Lars-Gunnar Dahlberg,Thomas Eriksson,Akbar Kheirmand,Mats Leijon,Henry Siberg,Dick Rudolfsson,Dag Winkler +7 more
TL;DR: In this article, a transducer is used to detect electric discharges in a test object (1) with at least two electric connection conductors (1a, 1b, 1c, 1d) consisting of transducers and evaluation equipment (PA, ABU, LU).
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Partial-discharge pulse-sensor for HV appts. - has different attenuation-frequency response according to whether one of two output connections is open- or short-circuited
TL;DR: In this article, an annular measurement electrode is surrounded by a metallic support ring from which it is insulated electrically by four fixing elements, and pulses are taken via pref. 50-ohm screened cables from two diametrically opposed output connections.
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References
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Patent
Corona discharge monitor system
TL;DR: In this paper, a rotary coupler, having a rotating portion fixed to the shaft of the machine and a fixed portion adjacent to the rotating portion, couples the signal to a signal conditioner.
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Corona testing apparatus including an oscilloscope and mechanical to electrical transducers having signal isolating means therebetween
John C Cronin,Paul Narbut +1 more
Patent
High voltage component testing systems
TL;DR: In this paper, an AND gate is used to compare the outputs from monitoring units to determine whether a predetermined polarity or time relationship indicative of a partial discharge has been satisfied, depending upon the configuration of the testing circuit.
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Corona discharge meter
TL;DR: In this article, the authors measure simultaneously corona discharge generated from samples and identify their sources of origin by providing primary bandpass filters on both sides of samples and secondary band-pass filters in a detector section.