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Single-phase ground fault positioning method and system

A single-phase ground fault and positioning method technology, which is applied in the direction of fault location, fault detection according to conductor type, instrument, etc., can solve the problems of signal source information loss, weak information source, low accuracy and reliability of fault detection, etc., to achieve Solve the effect of long power outage

Active Publication Date: 2019-04-19
STATE GRID JIANGSU ELECTRIC POWER CO ELECTRIC POWER RES INST +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is that the prior art medium and small current ground fault location technology is affected by the loss of information of a single signal source and the weak information source, and the fault detection accuracy and reliability are low. It provides a high-precision small current ground fault Positioning Technology

Method used

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  • Single-phase ground fault positioning method and system
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  • Single-phase ground fault positioning method and system

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Embodiment 1

[0054] Example 1: figure 1 It is a method flowchart of a specific embodiment of the present invention. figure 1 A single-phase-to-earth fault location method is shown, comprising:

[0055] (1) Collect the fault data collected by each detection device;

[0056] (2) Preprocessing the fault data, the fault data includes zero-sequence voltage, and when the zero-sequence voltage measured by any one of the detection devices exceeds a predetermined threshold value, it is determined that a small current grounding fault occurs;

[0057] (3) Calculate the fault information integrity of each detection device after determining that a small current grounding fault occurs, and assign a value to the confidence degree ri of the fault judgment result according to the information integrity;

[0058] (4) When the fault information is complete and it is determined that the confidence degree of the fault judgment result of the selected detection device meets the specific requirements, each fault...

Embodiment 2

[0063] Embodiment 2: On the basis of the above embodiments, this embodiment comprehensively utilizes the information collected by the distribution automation master station, new distribution terminals and fault indication systems, based on the big data analysis platform, starting from the characteristics of small current grounding faults, combining The action characteristics of the existing distribution automation system, dispatching automation system, fault indicator and small current grounding fault line selection device can realize high-precision and high-accuracy fault location.

[0064] In this embodiment, each detection device as a data source of multi-source information includes:

[0065] 1) Distribution automation management system

[0066] The distribution network automation management system is an information integration and comprehensive utilization system. This patent utilizes the information of the distribution automation master station system as follows:

[0067...

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Abstract

The invention discloses a single-phase ground fault positioning method and system. The method comprises the following steps of collecting fault data collected by each detection device; when fault information is complete after a small current ground fault occurs, judging whether the confidence level of a fault research and judgment result of the selected detection device meets a specific requirement, judging a single-phase ground fault section by using each fault detection device to obtain a fault section identification result of each fault detection device, determining the final fault sectionif the identification results are consistent; if the fault information of each fault detection device is incomplete or the confidence level of the fault research and judgment result does not meet thespecific requirement or the identification results of the fault section are inconsistent, a correlation coefficient method is utilized to determine the final fault section. The method and system maximize the utilization of the fault detection device in a distribution network, realizes the low-current ground fault positioning technology based on multi-source information, and overcomes the defect oflow precision of an existing fault positioning technology based on single-source information; meanwhile, data preprocessing ensures the accuracy and reliability of fault location.

Description

technical field [0001] The invention relates to a single-phase ground fault location technology, in particular to a single-phase ground fault location system and method, and belongs to the technical field of electric power system relay protection. Background technique [0002] An important feature of the smart grid is the ability to automatically detect faults and take corrective actions to minimize the scope and duration of outages, thereby reducing power outage losses for users. According to statistics, most of the power system blackouts are caused by the distribution network. Single-phase ground faults account for about 80% of the total distribution network faults. The fault detection (line selection, positioning and isolation, etc.) , It is of great significance to promote the construction of smart grid. [0003] my country's distribution network generally adopts ungrounded or arc-suppression coil grounding methods, and its single-phase grounding is in the form of small...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08G01R31/02
CPCG01R31/086G01R31/088G01R31/50
Inventor 李娟袁宇波滕俊王升波杨金喜陈锦明焦昊薛晨詹昕
Owner STATE GRID JIANGSU ELECTRIC POWER CO ELECTRIC POWER RES INST
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