Patent
Partial discharge detector of gas-insulated apparatus
Tatsuro Kato,Youichi Oshita +1 more
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TLDR
In this paper, a pair of semi-circular discs combined on a plane inside the metal vessel of a gas-insulated apparatus is used to detect electromagnetic signals generated by partial discharge.Abstract:
Electromagnetic waves generated by partial discharge occurring when gas-insulated apparatus fails are detected by using a compact, wide band and high sensitivity antenna. Electromagnetic waves produced by partial discharge are detected over a wide range with a high sensitivity by a circular antenna receiver (4) which comprises a pair of semi-circular discs combined on a plane inside the metal vessel (3) of the gas-insulated apparatus. The detected signal is measured by a measuring instrument (10) through a coaxial enclosed terminal (7) and a coaxial cable (8). Since the area of the semi-circular antenna unit is large, the capacitance between the antenna unit and a potential measuring unit can be large, so that the high sensitivity potential measurement can be also performed.read more
Citations
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References
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Patent
Abnormality diagnosing system and method for a high voltage power apparatus
Jun Ozawa,Fumihiro Endo,Youichi Ohshita,Izumi Yamada,Tokio Yamagiwa,Hiroshi Yamada,Mitsuo Sawairi,Hashime Nagai +7 more
TL;DR: An abnormality diagnosing system and method for high voltage power apparatus wherein a plurality of detectors for detecting abnormalities and providing outputs indicative thereof are disposed to detect predetermined phenomena indicative of at least an insulation abnormality, power supply abnormality and foreign matter among abnormalities existing inside of the HVPA as mentioned in this paper.
Journal ArticleDOI
Broadband couplers for UHF detection of partial discharge in gas-insulated substations
TL;DR: In this article, the UHF performance of a disc coupler designed for continuous monitoring of partial discharge in gas-insulated substations was investigated and a novel nonresonant experimental coupler design based on the design techniques used for broadband log-spiral antennas was presented.
Patent
Gas-insulated electric apparatus and method of detecting partial discharge therein
TL;DR: In this paper, a potential detected by a first potential detector through at least a portion of the insulating support is fed to the inputs of a differential amplifier of a partial discharge detecting device to detect possible partial discharges along the support with high sensitivity.
Patent
Partial-discharge measuring device
Kock Nicholas De,Herbst Ingo +1 more
TL;DR: In this paper, the authors proposed a partial discharge measuring device (3) which detects partial discharges in a gas-insulated, metal-enclosed, highvoltage system.
Patent
Measuring arrangement for detecting partial discharge within metal-shielded, pressure gas-isolated high-voltage commutator arrangements
TL;DR: Within a metal-clad, compressed gas-insulated switchgear to be holevoltage detected by means of a capacitive voltage divider partial discharges as mentioned in this paper, the measuring apparatus used therefor contains a Elektroje (6), the plate-shaped and flush with the orifice of the encapsulation (4) is inserted.