Patent
Partial discharge detecting device for electrical equipments
Tokihiro Umemura,Abe Keiichi +1 more
TLDR
In this paper, a partial discharge detecting device for transformers is described, which includes an antenna disposed in a metallic insulation gas filled tank enclosing a core and coil assembly and a signal processing circuit for processing an output signal from the antenna.Abstract:
A partial discharge detecting device for transformers includes an antenna disposed in a metallic insulation gas filled tank enclosing a core and coil assembly and a signal processing circuit for processing an output signal from the antenna. The antenna includes a magnetic core and a single coil or two coils differently operated. An electromagnetic wave due to the partial discharge is detected by the antenna. A detection signal from the antenna is supplied to the signal processing circuit, which determines whether or not the partial discharge has taken place, based on the detection signal.read more
Citations
More filters
Patent
Abnormality detecting method and apparatus for electric equipment, particularly for a rotating electric machine
Shioda Tetsu,Hideki Tokura,Kenji Morimoto,Takaho Tanaka,Yoshiharu Kaneda,Ito Keiichi,K. Kimura,Shigeo Kitamura +7 more
TL;DR: In this article, the authors present a defect detecting apparatus for monitoring an electrical equipment for defects, the electrical equipment having a resonance frequency, which includes a sensor operatively connected to the equipment for sensing a signal indicating a defect in the equipment; a first bandpass filter operating at substantially higher frequency than the resonance frequency of the equipment.
Patent
Closely-coupled multiple-winding magnetic induction-type sensor
TL;DR: In this article, a plurality of coils with separate windings, disposed on separate toroidal cores, are placed in close proximity of each other so that each coil responds independently to the same current.
Patent
Acoustic optical system for partial discharge detection and location
TL;DR: An apparatus for detecting a partial discharge in a high voltage transformer comprising a live tank comprises a metal box detachably connected to the tank, a first acoustic sensor inside the box for converting acoustic waves in a first frequency band to a first electrical output signal; signal conditioning circuitry inside a box for amplifying and filtering the first electrical signal; an electrical to optical converter, inside the boxes, for converting the amplified and filtered electrical signal to an optical signal; a fiber optic link for carrying the optical signal to a location remote from the transformer; and an optical to electrical converter at the remote
Patent
Arc flash detection system
TL;DR: An apparatus to detect arc is presented in this paper, which includes a fiber sensor to detect characteristics of an arc flash and a processor to process at least two characteristics of the are flash.
Patent
Method of detecting partial discharge using frequency spectrum analyzer
TL;DR: In this article, a method of detecting a partial discharge signal occurring at an insulator, using a Frequency Spectrum Analyzer (FSA) with a monitor screen, is presented, which consists of setting a horizontal axis of the monitor screen as a time axis and a vertical axis as an axis representing a voltage magnitude, with the horizontal axis and the vertical axis being constituted with a plurality of pixels.
References
More filters
Patent
Method and device for detecting and locating fault and/or partial discharges in a gas-insulated electrical equipment
TL;DR: In this paper, the authors proposed a method for detecting and locating faults and/or partial discharges in a gas-insulated electrical equipment, such as a bus, a cable, a substation, or a switchgear.
PatentDOI
Method and system for corona source location by acoustic signal detection
TL;DR: In this article, the electrical corona signal is gated and level-detected during an interval which is adjustable as to delay and length to generate a timing reference to initiate acoustic signal averaging.
Patent
Means for detecting the inception of corona discharges within induction apparatus
TL;DR: In this article, the authors propose a means for detecting the inception of corona discharges within liquid-insulated induction apparatus connected in a power circuit. But their method is limited to the case where the first and second signal pulses are received during any one of predetermined monitoring periods.
Patent
Microwave moisture sensor chute
TL;DR: In this paper, the authors present a moisture measuring apparatus which comprises a chute means of a given length for receiving moisture containing material, the chute mean having window opening means through which microwaves are transmitted.