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Difference frequency anti-interference local discharge online monitoring device

A partial discharge and monitoring device technology, applied in the direction of testing dielectric strength, etc., can solve the problems of high fault false alarm rate and omission rate, inability to monitor, inaccurate data, etc., to improve the quality of repair and maintenance, and to achieve accurate monitoring data. Reliable and effective in suppressing interfering signals

Inactive Publication Date: 2010-02-17
BAODING TIANWEI GRP CO LTD
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AI Technical Summary

Problems solved by technology

Existing on-line partial discharge monitoring devices generally use direct amplification and filtering to extract partial discharge signals from the original signals collected by partial discharge sensors. Interference signals, and this interference signal has the characteristics of randomness, diversity, and complexity, which makes it difficult for the existing partial discharge on-line monitoring device to avoid the frequency band of the interference signal, so the obtained data is inaccurate and the fault is falsely reported. The rate and false negative rate are very high or even impossible to monitor, which seriously restricts the improvement of the repair and maintenance quality of power equipment

Method used

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  • Difference frequency anti-interference local discharge online monitoring device
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  • Difference frequency anti-interference local discharge online monitoring device

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Embodiment Construction

[0015] see figure 2 , image 3 , the signal collected by the partial discharge sensor includes partial discharge signal and interference signal, the frequency range is 10kHz-5MHz, and the signal is controlled by the interference suppression circuit ( image 3 ) of the middle VIN terminal input, after being filtered by a multi-stage high-frequency band-pass circuit composed of inductors L1~L6 and capacitors C1~C6 (filter frequency band 10kHz-5MHz), the signal is transmitted to the high-frequency amplifier F1 (model is AD603), The weak signal is initially amplified (magnified by 100 times), and then the signal is transmitted to the first frequency difference device CP1, where the frequency difference is performed with the local oscillator signal from the first-stage variable frequency local oscillator BZ1, and the first-stage local oscillator The frequency range is 10.7MHz-15.7MHz, and then the signal is transmitted to the first intermediate frequency filter amplifier circuit ...

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Abstract

The invention relates to a difference frequency anti-interference local discharge online monitoring device, belonging to the field of detection technique, and aiming at improving the reliability of local discharge online monitoring data. The invention comprises the technical scheme as follows: the monitoring device consists of an interference inhibiting circuit, a high-speed A / D converter, a CPU and a display; the input end of the interference inhibiting circuit is connected with a local discharge sensor; output signals are connected to the IN end of the high-speed A / D converter; the ends B1 to B12 of the high-speed A / D converter are connected with the ends D0 to D11 of the CPU; and the display is connected with a PORTO interface of the CPU. The invention can effectively inhibit interference signals in the local discharge signals, ensures that the monitoring data is accurate and reliable, provides strong support for maintenance of high-pressure power equipment and greatly improves themaintenance quality of power equipment.

Description

technical field [0001] The invention relates to a device for on-line monitoring of partial discharge status of high-voltage electrical equipment, which belongs to the technical field of detection. Background technique [0002] With the development of society and the progress of electric power technology, people put forward higher requirements for the reliability of power equipment operation. Repair and maintenance according to the actual operating status is currently the most effective measure to ensure the reliability of power equipment, which requires the power sector to be able to track and detect its various parameters under the operating status of the power equipment. The partial discharge on-line monitoring device is a device used to monitor the partial discharge status and insulation status of high-voltage power equipment in operation. Existing on-line partial discharge monitoring devices generally use direct amplification and filtering to extract partial discharge s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/12
Inventor 刘大永杜玉新张鹏飞赵培雷
Owner BAODING TIANWEI GRP CO LTD
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