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Method and system of substation area zero sequence current protection

A zero-sequence current and station domain technology, applied in emergency protection circuit devices, electrical components, etc., can solve problems such as inability to guarantee selectivity and long time delay, and achieve the effects of improving overall performance, ensuring selectivity, and speeding up the action speed

Active Publication Date: 2013-04-24
POWER DISPATCHING CONTROL CENT OF GUANGDONG POWER GRID CO LTD
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Problems solved by technology

[0004] Based on the above situation, the present invention proposes a zero-sequence protection method and system in the station area to overcome the shortcomings of traditional zero-sequence current protection that cannot guarantee selectivity and long delay, and improve the reliability and rapidity of zero-sequence current protection. Provide a reliable guarantee for the safe operation of high-voltage / ultra-high-voltage transmission lines

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  • Method and system of substation area zero sequence current protection
  • Method and system of substation area zero sequence current protection
  • Method and system of substation area zero sequence current protection

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Embodiment Construction

[0019] The method and system of the present invention will be explained in detail below in conjunction with the accompanying drawings.

[0020] The station domain zero-sequence current protection method of the present invention, such as figure 1 shown, including the following steps:

[0021] Step S101, fault line selection: detect whether the zero-sequence current protection section IV in the substation operates, and perform fault line selection for all incoming and outgoing lines of the zero-sequence current protection action under the same voltage level in the substation by comparing the zero-sequence current amplitude;

[0022] Step S102, comprehensive fault detection results and signaling: according to the fault line selection results, zero-sequence current protection action information and line structure, determine the fault comprehensive detection results of the substation, and transmit the fault comprehensive detection results through the longitudinal protection channel...

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Abstract

The invention discloses a method and a system of substation area zero sequence current protection. The method and the system of the substation area zero sequence current protection comprise the following steps: obtaining zero sequence current protection action information of opposite terminal transformer substation protection by utilizing the existing redundant channel of pilot protection, integrating the zero sequence current protection action information of the opposite terminal transformer substation protection with zero sequence current protection action information of a home station, conducting decision fusion to make sure the position of a fault element, and forming a tripping decision of the substation area zero sequence current protection. The method and the system of the substation area zero sequence current protection improve overall performance of the traditional zero sequence current protection, guarantee selectivity of the zero sequence current protection, and accelerate the speed of a protective action.

Description

technical field [0001] The invention relates to the technical field of power system automation, in particular to a zero-sequence current protection method and system in a station domain. Background technique [0002] High voltage / extra high voltage transmission lines usually use both distance protection and zero-sequence current protection as backup protection. In practical applications, zero-sequence current protection is mainly used to reflect single-phase high-resistance grounding faults when grounding distance protection is configured. In order to simplify the setting and coordination of zero-sequence current protection in complex power grids, in engineering, sections I and II of zero-sequence current protection are often disabled, and only sections III and IV of zero-sequence current protection for reflecting high-impedance grounding faults are reserved. The primary value of zero-sequence current section III is 500A, with direction, and the action time is 4s; the prima...

Claims

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Application Information

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IPC IPC(8): H02H7/26
Inventor 张智锐张哲焦邵麟尹项根王峰文明浩陈卫王菲孔祥平
Owner POWER DISPATCHING CONTROL CENT OF GUANGDONG POWER GRID CO LTD
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