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Ultrasonic partial discharge sensor designed with high-precision signal frequency reduction circuit

A circuit design and high-precision technology, which is applied in the direction of testing circuits, testing dielectric strength, and testing using acoustic measurements, can solve the problems of signal frequency reduction, large external interference, increased device cost, and inability to detect small signals. The effect of small waveform distortion and voltage loss, stable network resonance point, and good detection effect

Active Publication Date: 2021-04-13
GUANGZHOU POWER SUPPLY BUREAU GUANGDONG POWER GRID CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the prior art, the detection effect of the detection circuit is poor, and it is prone to inertial distortion, negative peak cutting distortion, and noise will be introduced at the same time; the series diode envelope detection is suitable for large signal peak detection, and cannot detect small signals. It is necessary to add active components such as operational amplifiers, which have high requirements for operational amplifiers and increase the cost of the device; the traditional filter circuit has a small dynamic response range and cannot handle both small and large signals; the traditional passive filter circuit is amplified in the passband The multiple and its cutoff frequency vary with the load, which is not suitable for occasions with high signal processing requirements. At the same time, the passband of traditional filters is also affected by the input resistance and output resistance, that is, the internal resistance of the input signal source will make The resonance point of the filter network is shifted, thereby reducing the filtering effect; the overall signal down-frequency is greatly affected by external interference, which makes the sensitivity of the detection device low

Method used

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  • Ultrasonic partial discharge sensor designed with high-precision signal frequency reduction circuit
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  • Ultrasonic partial discharge sensor designed with high-precision signal frequency reduction circuit

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Embodiment Construction

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0029] The purpose of the present invention is to provide an ultrasonic partial discharge sensor designed with a high-precision signal frequency reduction circuit, which has a high-precision dedicated signal frequency reduction circuit, a simple circuit structure, and both small and large signal processing, which can greatly improve partial discharge. detection accuracy and detection sensitivity.

[0030] In order to make the above objects, features and advant...

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Abstract

The invention discloses an ultrasonic partial discharge sensor designed with a high-precision signal frequency reduction circuit, which includes a high-precision signal frequency reduction circuit. The high-precision signal frequency reduction circuit includes an electrically connected detection circuit and a filter circuit. The detection circuit Including a first resistor R1, a second resistor R2, a third resistor R3, a first diode D1, a second diode D2, a first capacitor C1 and a second capacitor C2; the filter circuit includes a fourth resistor R4, The fifth resistor R5, the sixth resistor R6, the seventh resistor R7, the eighth resistor R8, the ninth resistor R9, the third capacitor C3, the fourth capacitor C4, the fifth capacitor C5 and the operational amplifier A. The ultrasonic partial discharge sensor designed by the high-precision signal frequency reduction circuit provided by the present invention has a high-precision special signal frequency reduction circuit, the circuit structure is simple, and both small signal and large signal processing are taken into account, which can greatly improve the detection accuracy and accuracy of partial discharge. Detection sensitivity.

Description

technical field [0001] The invention relates to the technical field of circuit design of an ultrasonic partial discharge sensor, in particular to an ultrasonic partial discharge sensor designed with a high-precision signal frequency reduction circuit. Background technique [0002] At present, there are a large number of low-voltage switchgears in power plants and substations, the operating environment is harsh, and the internal components are prone to aging, which leads to partial discharge. Partial discharge refers to the discharge that occurs between the electrodes but does not penetrate the two electrodes. It is due to defects in the insulation of the equipment or defects caused in the production process, and repeated breakdown and extinction occur under the action of high electric field strength. [0003] The ability of this kind of discharge is very small, so its short-term existence does not affect the insulation strength of electrical equipment, but if electrical equi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/12G01R31/14
CPCG01R31/1209G01R31/14
Inventor 郝方舟赵洪山牛灿
Owner GUANGZHOU POWER SUPPLY BUREAU GUANGDONG POWER GRID CO LTD
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