Method and system for detecting ground leakage current of secondary-side long-distance cable of alternating-current system

A technology of leakage current detection and AC system, applied in the direction of only measuring current, measuring current/voltage, information technology support system, etc., can solve problems such as large protection dead zone, failure to reflect three-phase leakage fault, fire, etc., and achieve improved discrimination Sensitivity, reducing protection dead zone, and avoiding the effects of fire accidents

Active Publication Date: 2021-04-27
STATE GRID JIANGSU ELECTRIC POWER CO LTD MAINTENANCE BRANCH +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The technical effect of this invention relates to improving safety measures for electrical equipment used at remote locations such as power lines or communication wires that are susceptible to damage from external sources like lightning strikes or other factors affecting their performance. This helps prevent fires when these devices fail due to poor quality connections between components.

Problems solved by technology

This technical problem addressed in this patented text relates to detecting leaks that occur at various points along power lines used within subterranean locations where multiple cables connected together form branches called distribution systems (DS). Current methods require manual intervention during testing, making them difficult to use continuously over longer periods without being able to identify any potential issues quickly.

Method used

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  • Method and system for detecting ground leakage current of secondary-side long-distance cable of alternating-current system
  • Method and system for detecting ground leakage current of secondary-side long-distance cable of alternating-current system
  • Method and system for detecting ground leakage current of secondary-side long-distance cable of alternating-current system

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Embodiment Construction

[0069] The application will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solutions of the present invention more clearly, but not to limit the protection scope of the present application.

[0070] Such as figure 1 , the steps of the detection method for the ground leakage current of long-distance cables on the secondary side of the AC system are as follows:

[0071] Step 1, such as figure 2 , in the construction acceptance stage of the long-distance cables on the secondary side of the AC system, the residual current transformers are used to collect the inherent residual current at the head end and the end inherent residual current of the long-distance cables on the secondary side of the AC system, and the residual currents are collected separately using single-phase current transformers. The inherent leakage current at the head end and the end inherent leakage current of the long-dist

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Abstract

The invention discloses a method and a system for detecting ground leakage current of a secondary-side long-distance cable of an alternating-current system, which establish a leakage current composite detection criterion after compensation of inherent residual current and inherent leakage current, and realize detection of asymmetric leakage current and three-phase leakage current of the secondary-side long-distance cable of the alternating-current system through judgment of a logic circuit. On-line monitoring of the insulation condition of the long cable is realized, whether the alternating-current system has hidden troubles is determined, and an alarm signal is emitted, so that grounding fault hidden troubles caused by abnormal insulation can be discovered timely, and fire accidents can be avoided effectively. The composite criterion of current detection is introduced, and the inherent residual current is compensated, so that the protection dead zone is greatly reduced, the electric leakage alarm constant value is further reduced, and the discrimination sensitivity is improved.

Description

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Claims

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Application Information

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Owner STATE GRID JIANGSU ELECTRIC POWER CO LTD MAINTENANCE BRANCH
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