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A system and method for localizing partial discharge in substation space based on mle

A technology of partial discharge and positioning method, which is applied in the direction of radio wave measurement system, positioning, and measuring electricity. Good practical effect of promoting application value

Active Publication Date: 2022-01-04
国网安徽省电力有限公司亳州供电公司 +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the time difference method needs to sample the signal at a very high sampling frequency, so this method has high requirements for hardware and is difficult to implement; the angle positioning method is easily affected by the space environment and electromagnetic environment, and it is difficult to be accurate in practical applications. position

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  • A system and method for localizing partial discharge in substation space based on mle
  • A system and method for localizing partial discharge in substation space based on mle
  • A system and method for localizing partial discharge in substation space based on mle

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Embodiment 1

[0033] see figure 1 : This embodiment discloses a substation space partial discharge localization system based on MLE, including a UHF wireless sensor array and a data processing terminal, the UHF sensor array is placed around the monitoring area for measuring partial discharge intensity information and The data is transmitted to the data processing terminal through WiFi, and the data processing terminal is used for analyzing, processing and saving the data.

[0034] It should be noted that this embodiment can achieve high-precision localization of partial discharge in the whole substation space at a lower hardware cost, and is less affected by the space environment and electromagnetic environment, reducing the difficulty of partial discharge monitoring in substations. It improves the maintenance efficiency of power equipment failures, and finally improves the intelligence level of substation operation and maintenance.

[0035] Specifically, the UHF wireless sensor array is c...

Embodiment 2

[0037] This embodiment also discloses a method for locating partial discharge in substation space based on MLE, the method includes the following steps:

[0038] S1, ranging model parameter fitting;

[0039] The parameter fitting of the ranging model in S1 is specifically as follows: first fix the position of a certain UHF wireless sensor in the test area, and then use a partial discharge simulation source to measure the distance of the UHF sensor at every 0.25m linear distance. The received strength signal value of the wireless sensor from 1m to 20m is measured 20 times at each measurement point using a partial discharge source;

[0040] Use the least squares method to fit the parameters in the ranging model of formula (1):

[0041] RSSI=A-10nlgd(1);

[0042] Among them, d represents the distance between the discharge source and the sensor, RSSI represents the measured discharge intensity, and the model parameter A and path loss factor n are to be determined.

[0043] Sens...

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Abstract

The invention discloses an MLE-based substation space partial discharge positioning system, including a UHF wireless sensor array and a data processing terminal. The UHF sensor array is placed around the monitoring area to measure the partial discharge intensity information and transmit it to Data processing terminal, the data processing terminal is used to analyze, process and save data. The invention also discloses an MLE-based method for locating partial discharge in substation space. The invention realizes the location of the partial discharge source through the likelihood estimation method after measuring the partial discharge signal intensity in the substation for many times. Compared with the traditional time difference method and angle positioning method, the method of the present invention only needs to measure the partial discharge signal strength information, which not only ensures higher positioning accuracy, but also significantly reduces the cost of system hardware, and effectively improves the reliability of substation power equipment. The efficiency of monitoring and maintenance has good practical promotion and application value.

Description

technical field [0001] The invention relates to the field of operation and maintenance of power system substation equipment, in particular to an MLE-based substation space partial discharge positioning system and method. Background technique [0002] Live detection of power equipment is one of the important means to find hidden dangers in the operation of power equipment, and it is also an important guarantee for the safe and stable operation of power equipment. According to statistics, with the continuous improvement of the voltage level of my country's power system, insulation faults account for more than 50% of power equipment faults. An important manifestation of equipment insulation failure is the occurrence of partial discharge. Partial discharge is not only a manifestation of insulation degradation, but also aggravates the degree of insulation degradation, resulting in a vicious circle, and finally causes insulation breakdown, which in turn leads to major accidents. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/12G01S5/02
CPCG01R31/1227G01S5/02
Inventor 闫帅高峻王高洁王康戴明明李强李朋宇罗林根
Owner 国网安徽省电力有限公司亳州供电公司