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A differential protection method and device for transmission lines

A differential protection device and differential protection technology, applied in the direction of emergency protection circuit devices, electrical components, etc., can solve the problem of unreliable operation of longitudinal differential protection

Active Publication Date: 2021-10-22
XUJI GRP +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a differential protection method and device for transmission lines, which is used to solve the problem that the existing longitudinal differential protection cannot operate reliably when high-resistance grounding and slowly developing faults occur

Method used

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  • A differential protection method and device for transmission lines
  • A differential protection method and device for transmission lines
  • A differential protection method and device for transmission lines

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Embodiment Construction

[0025] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0026] Embodiments of differential protection methods for transmission lines:

[0027] This embodiment provides a differential protection method for transmission lines, by taking the zero-sequence voltage variation of the differential protection devices on both sides in the set time period span and the zero-sequence current of the differential protection devices on both sides as judgments The auxiliary criterion of whether to open the differential protection, in the event of a slowly developing fault or a high-impedance ground fault, the differential protection can act quickly to protect the safety and stability of the power system. Specifically, the flow chart of the differential protection method for transmission lines is as follows im...

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Abstract

The present invention relates to a differential protection method and device for power transmission lines, including: when the current condition for starting the differential protection is met, and the differential protection is not started but the duration of meeting the starting condition for the differential protection is longer than a preset time, Control and start the differential protection; judge whether the operating conditions of the differential protection are met, and if the operating conditions of the differential protection are met and the protection on the opposite side has been activated, the differential protection will operate after a short delay. The present invention uses the variation of zero-sequence voltage on both sides and the zero-sequence current on both sides as supplementary criteria. When a high-resistance grounding fault or a slow-developing fault occurs, the differential protection can be quickly activated to ensure safe and stable operation of the power system.

Description

technical field [0001] The invention relates to a differential protection method and device for power transmission lines, belonging to the technical field of power systems. Background technique [0002] The longitudinal optical fiber differential protection based on Kirchhoff's theorem has the advantages of fast operation speed and high reliability. As the main protection of the whole line, it has been widely used in the protection of high-voltage transmission lines. The devices on both sides of the longitudinal optical fiber differential protection use the fiber optic channel to exchange information such as analog quantities and state quantities on both sides, and then perform fault discrimination. The action equation adopts the ratio braking equation, and the expression of the ratio braking equation is as follows: [0003] [0004] where the differential current I CDΦ =|I MΦ +I NΦ |, braking current I r =|I MΦ -I NΦ |, I MΦ , I NΦ is the current vector on both s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26
CPCH02H7/26
Inventor 李文正李宝伟李旭唐艳梅王莉倪传坤邓茂军姜自强郝慧贞董新涛都磊李萌
Owner XUJI GRP
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