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A band-pass filtering device for implementing local online monitoring by remote control frequency selection

A band-pass filter and band-pass filter technology, applied in the field of partial discharge monitoring, can solve the problems of effective interference signal extraction, low operability, and high noise level, and achieve the degree of multiple configuration methods, high operability, and automation high effect

Active Publication Date: 2019-10-25
SHANGHAI MUNICIPAL ELECTRIC POWER CO +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] 1. The range of each frequency band is too wide. In addition to the effective partial discharge signal, it also contains a large amount of noise and various interference signals, which seriously interferes with the extraction of effective signals.
[0007] 2. The noise level in the frequency band may be too high, which will cause the signal-to-noise ratio in the effective signal frequency to be too low
[0008] 3. It is necessary to manually select and switch, relying on the experience of testers to make comparisons and selections, and the operability is low

Method used

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  • A band-pass filtering device for implementing local online monitoring by remote control frequency selection
  • A band-pass filtering device for implementing local online monitoring by remote control frequency selection
  • A band-pass filtering device for implementing local online monitoring by remote control frequency selection

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Embodiment approach 2

[0039] When the long-term on-line monitoring system encounters the interruption source of partial discharge signals, the second implementation mode first performs fault phasing judgment. The process is as follows. First, the software automatically controls the hardware broadband filter to collect signals in 4 frequency bands for comparison, and selects the broadband with the highest sensitivity. The frequency band is monitored, and the signal size of the three phases in the same frequency band is also compared, and the output phase with the largest signal level is selected as the PD phase. From this, it can be determined which phase of the three-phase cable the source of the PD signal is. The second embodiment is mainly the phasing step of partial discharge, which is automatically executed by the software according to the algorithm.

Embodiment approach 3

[0041] After the system executes the phasing monitoring of Embodiment 2, the software automatically switches modes and enters the positioning judgment. Since the PD signal will propagate in the cable in the form of traveling waves, the signal will attenuate to a certain extent as the length of the cable increases. At the same time, due to the impedance characteristics of the cable, the attenuation speed of the high-frequency signal is much faster than that of the high-frequency signal during the long-distance propagation of the PD signal. The low frequency is fast, so if the PD point is far away from a test point, the PD signal cannot be collected in the high frequency band. Therefore, in the process of positioning and judging, it is easy to collect PD waveforms by selecting a low frequency band of 1-5MHz. The process is as follows. While the fault phase has been determined in the second embodiment, the software controls the hardware broadband band-pass filter to lock at 1-5MHz...

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Abstract

The invention relates to a bandpass filtering device for carrying out partial discharge online monitoring through remote control band selection. The device comprises a pulse current sensor, a multi-band bandpass filter, an analog to digital converter and an upper computer which are connected in sequence. A narrowband bandpass filtering module and an automatic band selection module are arranged in the upper computer. The automatic band selection module and the multi-band bandpass filter are connected. The working process of the system is that the pulse current sensor collects a detection waveform; the band of the multi-band bandpass filter is automatically selected by employing the automatic band selection module; broadband filtering is carried out; the signal output by the multi-band bandpass filter is converted into a digital signal; the digital signal is sent to the upper computer; and narrowband filtering is carried out through the narrowband filtering module. Compared with the prior art, the device has the advantages of high precision and high sensitivity.

Description

technical field [0001] The invention belongs to the technical field of partial discharge monitoring of high-voltage cable lines, and in particular relates to a band-pass filter device for implementing partial discharge on-line monitoring through remote control frequency selection. Background technique [0002] The power industry is a basic industry. Once a ground fault occurs in power equipment, it will affect the national economic production and people's life. If it is small, it will cause a long-term power outage for users, and if it is serious, it will cause damage to power generation and transmission equipment. If there is a ground fault in the cable terminal, GIS body, cable body, etc., it will affect the normal operation and power supply of the power plant, and even lead to the paralysis of the entire power grid, thereby affecting the stability of the system and the safety of equipment. The economic loss caused by the grounding fault of power equipment to the power com...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03H17/02G01R31/12
CPCG01R31/1272H03H17/0248
Inventor 顾黄晶蒋晓娟史晓俊管灏磬叶颋招灏文金毅温德康严其强宋宁火亮何磊徐伟东盛刚周智鹏蔡诗廷石娜
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO