Unlock instant, AI-driven research and patent intelligence for your innovation.

Positioning method and system suitable for arc grounding fault

A ground fault and location method technology, which is applied to fault location, fault detection by conductor type, measurement device, etc., can solve the problems of complex on-site operation environment, power failure loss, time-consuming and laborious, etc., to improve initial positioning accuracy and ensure safety and stability. The effect of improving the positioning accuracy

Active Publication Date: 2020-08-25
SHANGHAI JIAO TONG UNIV
View PDF6 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] my country's distribution network generally adopts ungrounded or arc-suppression coil grounding methods, and its single-phase grounding is in the form of a small current ground fault. Caused unnecessary power outage losses. According to statistics, about 20% of the distribution network faults are caused by the manual pull of the switch caused by the small current grounding, which has a great impact on the reliability of the distribution network; at the same time, as the distribution network The improvement of the leanness of network operation inspection requires rapid location of the fault section. What is more serious is that with the widespread access of distributed power sources in the distribution network, the requirements for efficient fault location of the distribution network are getting higher and higher. , the low-current ground fault location technology is affected by factors such as weak fault signal, complex on-site operating environment, low reliability of fault detection equipment, and fault causes, and the accuracy of fault detection and location is low

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Positioning method and system suitable for arc grounding fault
  • Positioning method and system suitable for arc grounding fault
  • Positioning method and system suitable for arc grounding fault

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] refer to figure 1 and figure 2 , which is the first embodiment of the present invention, this embodiment provides a method for locating arc-fault ground faults, including:

[0043] S1: Collect ground fault data for label classification to form arc ground fault data and non-arc ground fault data. It should be noted that the label classification includes:

[0044] Preprocess the collected ground fault data, and mark the ground fault data according to the arc characteristics and cycle;

[0045] Use the characteristics of zero-sequence current waveform and the change of fault phase voltage to retrieve the arc-fault ground fault data in the ground fault data;

[0046] The remaining ground fault data that have not been retrieved are non-arcing ground fault data.

[0047] S2: Identify and judge the arc ground fault data by using the peak pulse, and obtain the identification result. What needs to be explained in this step is that the use of peak pulses for identification ...

Embodiment 2

[0093] refer to image 3 , which is the second embodiment of the present invention, which is different from the first embodiment in that it provides a positioning system suitable for arcing ground faults, including:

[0094] Acquisition module 100 is used to obtain sampling of zero-sequence current and voltage, various ground fault data and arc ground fault historical data, which includes voltage sampling unit 101, current sampling unit 102 and data information unit 103, and voltage sampling unit 101 is used for The zero-sequence voltage of the distribution network bus is collected, the current sampling unit 102 is used to collect the zero-sequence current of the distribution line, and the data information unit 103 is used to collect various ground fault historical data and data to be detected.

[0095] The control module 200 is connected with the acquisition module 100, and it is used for receiving, calculating, and regulating sampling data and cycle data, and it includes an ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a positioning method and system suitable for an arc grounding fault. The method comprises the following steps: collecting grounding fault data, carrying out the label classification, and forming arc grounding fault data and non-arc grounding fault data; identifying and judging the arc grounding fault data by using peak pulses to obtain an recognition result; constructing apositioning model based on an LSSVM to perform positioning calculation on the recognition result to obtain a preliminary positioning result; and verifying the preliminary positioning result for the second time by using a Bayesian probability strategy to determine a final positioning result, and completing positioning. According to the invention, the lean degree of distribution network operation detection is improved, quick positioning of fault points is realized, the influence of weak fault signals, complex on-site operation environment, low reliability of fault detection equipment, fault reasons and other factors on the existing fault positioning technology is eliminated, the positioning accuracy is improved, and the safety and stability of distribution network operation are ensured.

Description

technical field [0001] The invention relates to the technical field of identification and positioning of ground faults in distribution networks, in particular to a positioning method and system suitable for arc light ground faults. Background technique [0002] my country's distribution network generally adopts ungrounded or arc-suppression coil grounding methods, and its single-phase grounding is in the form of a small current ground fault. Caused unnecessary power outage losses. According to statistics, about 20% of the distribution network faults are caused by the artificial pull of the switch caused by the small current grounding, which has a great impact on the reliability of the distribution network; at the same time, with the distribution network The improvement of the leanness of network operation inspection requires rapid location of the fault section. What is more serious is that with the widespread access of distributed power sources in the distribution network, the...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): G01R31/08G01R31/52
CPCG01R31/086G01R31/088G01R31/52
Inventor 杜莹刘亚东严英杰丛子涵熊思衡江秀臣
Owner SHANGHAI JIAO TONG UNIV