On-line positioning method and system of section with low-current ground faults

A technology of small current grounding and fault section, which is applied in the direction of fault location, information technology support system, and measurement using digital measurement technology to achieve high stability, improve sampling accuracy, and improve power supply quality.

Inactive Publication Date: 2012-07-11
STATE GRID BAODING ELECTRIC POWER SUPPLY CO +3
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Problems solved by technology

[0005] In order to overcome the deficiencies in the prior art, the present invention proposes a method that fully guarantees the accuracy and rapidity of positioning, and effectively solves the problem of online positioning of single-phase ground faults in neutral point non-effectively grounded power grids and short circuits between lines. An online location method for small current ground fault sections based on the fault monitoring problem, and based on this method, a section online location system for small current ground faults is provided

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  • On-line positioning method and system of section with low-current ground faults
  • On-line positioning method and system of section with low-current ground faults
  • On-line positioning method and system of section with low-current ground faults

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Embodiment Construction

[0052] The on-line positioning method for the small current grounding fault section of the present invention is a bottom-up comprehensive judgment method. The distribution line section is divided based on fixed measuring points, and the state of the distribution line section is related to the zero-sequence current of the fixed measuring point. Phasors are closely related. By detecting the zero-sequence voltage of the system in the power line and the amplitude and phase of the zero-sequence current at any point on the line, determine the relationship between the measuring point and the location of the fault point to determine the location of the fault point. The "fault section" in the present invention specifically refers to a section where a single-phase ground fault occurs in a power distribution line.

[0053] Hereinafter, the method of the present invention will be described with reference to the accompanying drawings.

[0054] The first step is to identify the upstream an...

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Abstract

The invention discloses an on-line positioning method of a section with low-current ground faults and a system based on the positioning method. The method and the system are suitable for a neutral ungrounded power grid of 3-60kV. Under the operation condition of a line with single-phase ground faults, the phasor information of a zero-sequence voltage and the amplitude and phasor information of a zero-sequence current of the line are measured, and the section position of a fault point is determined according to the amplitude and phase information. The accuracy and rapidity of positioning are fully ensured, and the on-line positioning problem of single-phase ground faults of the neutral ineffectively grounded power grid and the monitoring problem of short-circuit faults between lines are effectively solved.

Description

technical field [0001] The invention relates to a section online positioning method for small current grounding faults and a positioning system based on the positioning method. The method and device are especially suitable for 3-60kV neutral point ungrounded power grids operating with single-phase grounding faults on the line In the case of , measure the amplitude and phasor information of the zero-sequence voltage and line zero-sequence current, and determine the section location of the fault point according to the amplitude and phase information. Background technique [0002] At present, the neutral point ungrounded method is widely used in domestic 3kV-60kV distribution network, also known as small current grounding system, most of the faults of this type of system are single-phase grounding faults. When a single-phase ground fault occurs, the ground current is very small, and it can continue to operate for 1~2 hours under the fault condition, but when a single-phase grou...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08G01R19/25
CPCY04S10/522Y04S10/52
Inventor ZHENG GUPINGNIU ZHUOBOQI ZHENGDENG HONGHUAIYANG YIHANTANG LIANGLI GANGWANG HONGWEIQIAO XUEJUNJIANG CHAOTIAN YONGCHAOFAN ZHICHONGLIANG SHUZENG
Owner STATE GRID BAODING ELECTRIC POWER SUPPLY CO
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