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A single-phase ground fault location 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, short-circuit test, etc., can solve the problems of signal source information loss, weak information source, low accuracy and reliability of fault detection, etc. To achieve the effect of solving long power outages

Active Publication Date: 2021-07-02
STATE GRID JIANGSU ELECTRIC POWER CO ELECTRIC POWER RES INST +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

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  • A single-phase ground fault location method and system
  • A single-phase ground fault location method and system
  • A single-phase ground fault location method and system

Examples

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Embodiment 1

[0054] Example 1: figure 1 It is a flow chart of a method of specific embodiments of the present invention. figure 1 A single-phase ground fault location method is shown, including:

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

[0056] (2) Preprocessing the fault data, the fault data comprises a zero sequence voltage, and when the zero-sequence voltage measured by any one detecting device exceeds a predetermined threshold, it is determined that a small current grounding failure occurs;

[0057] (3) Determine the completeness of the detection device fault information integrity after the small current is grounded, and assigns a value Ri to the fault judgment results according to the information integrity;

[0058] (4) When the fault information is complete, it is determined that the failure of the selected detection device satisfies the specific requirements, and the determination of the single-phase ground fault section is determined by each fault detecting de...

Embodiment 2

[0063] Example 2: On the basis of the above embodiment, the present embodiment integrates information collected by the power distribution automation master, new power distribution terminal, and fault indication, based on large data analysis platform, combined from small current grounding fault characteristics, combined Existing distribution automation systems, scheduling automation systems, fault indicators, and small current distribution fault line devices have fault location for high-precision and high accuracy.

[0064] Each of the detection devices of the data source as multi-source information in this embodiment include:

[0065] 1) Distribution automation management system

[0066] The distribution network automation management system is an information integration and comprehensive utilization system. This patent uses the power-on automation master system information as follows:

[0067] 13U0 Alarm information assists whether or not a single phase failure occurs, if there is...

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Abstract

The invention discloses a single-phase grounding fault location method and system. The method includes collecting fault data collected by each detection device; when a small current grounding fault occurs and the fault information is complete, it is determined that the fault research result of the selected detection device is confident If the specific requirements are met, each fault detection device is used to judge the single-phase ground fault section to obtain the fault section identification results of each fault detection device. If the identification results are consistent, the final fault section is determined; if each fault detection device If the fault information is incomplete or the confidence degree of the fault research and judgment results does not meet specific requirements or the fault section identification results are inconsistent, the correlation coefficient method is used to determine the final fault section. The present invention maximizes the use of fault detection equipment in the distribution network, realizes the small current grounding fault location technology based on multi-source information, and solves the shortcoming of low accuracy of the existing fault location technology based on single-source information; data preprocessing ensures fault Positioning accuracy and reliability.

Description

Technical field [0001] The present invention relates to a single-phase ground fault positioning technique, and more particularly to a single-phase ground fault location system and method belonging to the technical field of power system relay protection. Background technique [0002] An important feature of the smart grid is to automatically detect faults and perform corrective operations, minimize power outage range and power outage, and reduce the user's power outage. According to statistics, most of the power system is due to the cause of the distribution network, and the single-phase ground fault accounts for about 80% of the total number of power distribution network, and its fault detection (line, positioning, and isolation, etc.) technology is improved reliability. It is very important to promote the construction of smart grid. [0003] my country's distribution network generally adopts non-ground or consuming coil connection, which is singlely connected to a small current ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08G01R31/52
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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