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High-voltage switch cabinet partial discharge detection device

A partial discharge detection, high-voltage switchgear technology, applied in the direction of testing circuits, testing dielectric strength, etc., can solve problems such as not having real-time performance, and achieve the effect of ensuring accuracy

Inactive Publication Date: 2021-01-29
苏业梅
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the above situation, in order to overcome the defects of the prior art, the purpose of the present invention is to provide a partial discharge detection device for high-voltage switchgear, which effectively solves the problem of using the prior art to detect the partial discharge of high-voltage switchgear while improving accuracy. non-real-time problems

Method used

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  • High-voltage switch cabinet partial discharge detection device

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Effect test

Embodiment 1

[0011] Embodiment 1, a partial discharge detection device for a high-voltage switchgear, including a frequency distortion adjustment circuit, an amplitude distortion adjustment circuit, a modulation output circuit, and a distortion judgment circuit. The frequency distortion adjustment circuit uses a first matching circuit to receive information received by a receiving sensor in an ultrasonic sensor The partial discharge signal realizes the function of frequency selection and filtering out the interference of other frequency signals. The harmonic frequency amplifier composed of MOS transistor T1 and the second matching circuit is further harmonically amplified and then output to realize linear amplification and frequency selection of high-frequency small signals. All the way into the amplitude distortion adjustment circuit, the impedance matching circuit is used to match, and the MOS transistor T2 and the resistor R12 are used as the input resistance of the operational amplifier ...

Embodiment 2

[0012] Embodiment 2. On the basis of Embodiment 1, the frequency distortion adjustment circuit adopts a first matching circuit composed of variable capacitance C1, capacitance C2, series connected variable capacitance diode BD3, capacitance C14, and inductance L1 to receive the ultrasonic sensor. The partial discharge signal received by the sensor (it is a high-frequency small signal, the partial discharge signal received by the receiving sensor is specifically the partial discharge signal detected by the transmitting sensor in the ultrasonic sensor, which sends ultrasonic waves under the high-frequency voltage of the oscillator, and the ultrasonic waves are in the form of density Form transmission, and pass to the receiving sensor), realize the function of frequency selection, filter out other frequency signal interference, (the frequency of frequency selection is the frequency transmitted by the transmitting sensor) added to the gate of MOS transistor T1, the drain of MOS tran...

Embodiment 3

[0013] Embodiment 3, on the basis of Embodiment 1, the amplitude distortion adjustment circuit receives the output signal of the frequency distortion adjustment circuit, after being matched by an impedance matching circuit composed of capacitor C7, variable capacitors C8 and C9, inductors L4 and L5, and MOS transistor T2 and resistor R12 are used as the input resistance of the operational amplifier AR2 to avoid distortion of the high-frequency signal frequency during backward transmission. The operational amplifier AR2, MOS transistor T2, resistor R13, resistor R12, and impedance matching circuit form a controllable gain amplifier , output after amplitude adjustment, wherein the amplitude adjustment is controlled by the reverse voltage added to the gate of MOS tube T2, to solve the problem that the accuracy of the detection signal is affected due to the rapid attenuation of the ultrasonic signal, including capacitor C7, one end of capacitor C7 is connected The other end of the ...

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Abstract

The invention provides a high-voltage switch cabinet partial discharge detection device. A frequency distortion adjusting circuit adopts a first matching circuit to receive partial discharge signals received by a receiving sensor in an ultrasonic sensor, an adjustable harmonic frequency amplifier further performs harmonic frequency amplification and then outputs the signals, one path enters the amplitude distortion adjusting circuit, matching is performed by adopting an impedance matching circuit, after amplitude adjustment by a controllable gain amplifier, the signals enter a modulation output circuit, are subjected to frequency modulation by a variable capacitance diode frequency modulation circuit and then serve as output signals of the receiving sensor to be transmitted to a controller, the other path of signals enter a distortion judgment circuit, a loop filter is used to extract the amplitude of the signals, when the amplitude is higher than +5V, one path of the generated reversevoltage is fed back to the harmonic frequency amplifier through an output signal of a triode Q1 to adjust the frequency of a received signal and is fed back to an emitter of a triode Q2 to adjust theoutput frequency of a modulated signal, and the other path of the generated reverse voltage enters the controllable gain amplifier to adjust the amplitude of the received signal, so that the accuracyand real-time performance of a detection signal are ensured.

Description

technical field [0001] The invention relates to the technical field of high-voltage switch cabinets, in particular to a partial discharge detection device for high-voltage switch cabinets. Background technique [0002] High-voltage switchgear is the switchgear that is widely used and has the largest number. The operating status of high-voltage switchgear has a major impact on the reliability of power supply in the power system. Partial discharge is a common fault that endangers the safe operation of high-voltage switchgear. In order to ensure the economy and reliability of high-voltage switchgear It is necessary to ensure the accuracy and timeliness of partial discharge detection of high-voltage switchgear. [0003] At present, ultrasonic partial discharge is usually used for detection. Due to the interference in the space (the operation of equipment near the site, the friction of construction machinery, the corona of nearby live conductors, and the operating noise of the hi...

Claims

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Application Information

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IPC IPC(8): G01R31/14
CPCG01R31/14
Inventor 苏业梅
Owner 苏业梅