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High-voltage switch cabinet partial discharge positioning method and system considering temperature field change

A high-voltage switchgear and partial discharge technology, which is applied in radio wave measurement systems, positioning, and electrical measurement, can solve problems such as poor positioning accuracy, missing data from a single sensor, and inaccurate discharge types, etc., to reduce calculation pressure and reduce Calculate the error and reduce the effect of distance error

Inactive Publication Date: 2021-01-12
ZAOZHUANG POWER SUPPLY COMPANY OF STATE GRID SHANDONG ELECTRIC POWER +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The partial discharge detection methods of high-voltage switchgear include pulse current method, ultrasonic method, transient low voltage method (TEV) and ultra-high frequency method, but the single partial discharge collection method often has problems such as poor positioning accuracy and inaccurate discharge type At the same time, due to different sensitivities, a single sensor may also have abnormal situations such as missing data. Therefore, at present, multi-type sensors are used for simultaneous measurement to improve detection and positioning accuracy.
The inventors found that the prior art did not take into account the influence of the value change of the temperature field in the cabinet on the ultrasonic propagation velocity, and the calculation of the distance of the PD source was inaccurate, resulting in low positioning accuracy of the PD

Method used

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  • High-voltage switch cabinet partial discharge positioning method and system considering temperature field change
  • High-voltage switch cabinet partial discharge positioning method and system considering temperature field change
  • High-voltage switch cabinet partial discharge positioning method and system considering temperature field change

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Embodiment 1

[0031] This embodiment provides a method for locating partial discharge in a high-voltage switchgear considering changes in the temperature field;

[0032] Such as figure 1 As shown, the partial discharge localization method of high-voltage switchgear considering the change of temperature field includes:

[0033] S101: Obtain the preliminary positioning space of the partial discharge source of the high-voltage switchgear; according to the preliminary positioning space of the partial discharge source of the high-voltage switchgear and the positional relationship of each ultrasonic sensor inside the high-voltage switchgear, obtain the constraints of each ultrasonic propagation path;

[0034] S102: Construct the three-dimensional temperature field of the high-voltage switchgear to obtain the temperature distribution of the ultrasonic propagation path; calculate the distance between each ultrasonic sensor and the partial discharge source according to the temperature distribution o...

Embodiment 2

[0113] This embodiment provides a high-voltage switchgear partial discharge positioning system that considers changes in the temperature field;

[0114] A high-voltage switchgear partial discharge localization system considering temperature field changes, including:

[0115] The acquisition module is configured to: obtain the constraint conditions of each ultrasonic propagation path according to the preliminary positioning space of the partial discharge source of the high-voltage switchgear and the positional relationship of each ultrasonic sensor inside the high-voltage switchgear;

[0116] A calculation module configured to: construct a three-dimensional temperature field of the high-voltage switchgear to obtain the temperature distribution of the ultrasonic propagation path; calculate the distance between each ultrasonic sensor and the partial discharge source according to the temperature distribution of the ultrasonic propagation path;

[0117] The output module is configu...

Embodiment 3

[0122] This embodiment also provides an electronic device, including: one or more processors, one or more memories, and one or more computer programs; wherein, the processor is connected to the memory, and the one or more computer programs are programmed Stored in the memory, when the electronic device is running, the processor executes one or more computer programs stored in the memory, so that the electronic device executes the method described in Embodiment 1 above.

[0123] It should be understood that in this embodiment, the processor can be a central processing unit CPU, and the processor can also be other general-purpose processors, digital signal processors DSP, application specific integrated circuits ASIC, off-the-shelf programmable gate array FPGA or other programmable logic devices , discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor, or the processor may be any conventional processor, o...

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Abstract

The invention discloses a high-voltage switch cabinet partial discharge positioning method and system considering temperature field changes, and the method comprises the steps: obtaining the constraint conditions of all ultrasonic propagation paths according to the position relation between the initial positioning space of a partial discharge source of a high-voltage switch cabinet and all ultrasonic sensors in the high-voltage switch cabinet; constructing a three-dimensional temperature field of the high-voltage switch cabinet to obtain a temperature distribution condition of an ultrasonic propagation path; calculating the distance between each ultrasonic sensor and the partial discharge source according to the temperature distribution condition of the ultrasonic propagation path; inputting the propagation time difference between the starting moment of the signal measured by each ultrasonic sensor and the timing starting point and the distance between each ultrasonic sensor and the partial discharge source into a positioning equation, and searching an optimal solution in combination with constraint conditions to obtain the position of the partial discharge source.

Description

technical field [0001] The present application relates to the technical field of partial discharge location, in particular to a method and system for partial discharge location of a high-voltage switchgear considering temperature field changes. Background technique [0002] The statements in this section merely mention the background art related to this application, and do not necessarily constitute the prior art. [0003] As a complete set of switchgear for receiving and distributing network power and controlling, protecting and monitoring electrical equipment, high-voltage switchgear is widely used in various substations. Compared with the high-voltage power grid, due to the different degrees of problems in the design, manufacture, installation, operation and maintenance of the high-voltage switchgear, the accident rate is relatively high. According to incomplete statistics, in many types of switchgear accidents, the number of switchgear accidents caused by insulation fau...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00G01R31/12G01S5/18G06F30/23
CPCG01R31/00G01R31/1209G01S5/18G06F30/23G06F2119/08
Inventor 康文文李森李国亮刘振虎杨凤文韩锋宋士瞻刘玉娇张健王坤代二刚
Owner ZAOZHUANG POWER SUPPLY COMPANY OF STATE GRID SHANDONG ELECTRIC POWER
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