Device for single-phase earth fault line selection and method thereof

A single-phase ground fault, line selection device technology, applied in the direction of fault location, emergency protection circuit device, electrical components, etc., can solve the problem of small ground current, achieve the effect of simple and clear principle, improve sensitivity and reliability

Inactive Publication Date: 2010-10-20
GUANGZHOU ZHIGUANG ELECTRIC CO LTD
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  • Summary
  • Abstract
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Problems solved by technology

[0005] The primary purpose of the present invention is to overcome the shortcomings and deficiencies of the prior art, to provide a single-phase grounding fault line selection device, which is mainly used in resonant grounding systems. It overcomes the problems of the existing system operation mode and small ground current, and can reliably and accurately select the ground fault line

Method used

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  • Device for single-phase earth fault line selection and method thereof
  • Device for single-phase earth fault line selection and method thereof
  • Device for single-phase earth fault line selection and method thereof

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Embodiment

[0025] like figure 1 As shown, the device for line selection for single-phase grounding faults of the present invention includes zero-sequence CTs (current transformers), automatic line selection devices, and disturbance sources connected in sequence. Among them, the zero-sequence CT is installed on each line, and the sampling of the zero-sequence current of each line is completed after the single-phase grounding occurs in the system, and the sampling signal is sent to the automatic line selection device. The automatic line selection device includes a main control module 3, a power supply module 4, and a data acquisition module 1, a time module 6, a switch input and output module 2, a communication module 7, and a display and keyboard control module 5 respectively connected to the main control module 3, The data acquisition module 1 receives the sampling signal of the zero-sequence CT, and the switch input and output module 2 is connected to the disturbance source; the power m...

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Abstract

The invention provides a method for single-phase earth fault line selection and a method thereof. The device comprises an automatic line selection device, a disturbance source and a zero sequence current transformer, wherein the disturbance source is arranged on a system neutral point and transmits the disturbance to a zero sequence circuit of the system after receiving a disturbance command transmitted by the automatic line selection device; and the zero sequence current transformer is arranged on each line, is connected with the automatic line selection device and is used for sampling the disturbed zero sequence circuit current. The invention is not limited by the magnitude of the system capacitance current, earth types and other factors and can be used for reliably and accurately selecting an earth fault line.

Description

technical field [0001] The invention relates to a small current grounding line selection technology, in particular to a single-phase grounding fault line selection device and method thereof. Background technique [0002] Single-phase-to-ground fault line selection in small-current grounded systems is a long-term problem in power systems. Quickly and correctly selecting grounded lines after single-phase grounding occurs plays an important role in the safe operation of power systems. Accurate grounding line selection method and grounding line selection protection device have important contributions to the power system: timely and accurate judgment and selective removal of grounding faults, realizing selective action of grounding faults, and limiting the operation of the system with single-phase grounding faults , reduce the duration of single-phase grounding faults, and ensure the safe operation of the system; reduce the operating overvoltage level of the system, so that the e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08H02H7/26
Inventor 姜新宇陆国庆余怀林
Owner GUANGZHOU ZHIGUANG ELECTRIC CO LTD
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