Method and device for eliminating hidden dangers of faulty protection of power line distance iii section

A power line and distance technology, applied in the field of electric power, can solve problems such as power grid blackout accidents, and achieve the effect of preventing malfunctions

Active Publication Date: 2016-06-08
SHENZHEN POWER SUPPLY BUREAU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Avoid blockage of interphase distance or grounding distance section III protection incorrect action, etc., which will cause large-scale power outage accidents in the power grid

Method used

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  • Method and device for eliminating hidden dangers of faulty protection of power line distance iii section
  • Method and device for eliminating hidden dangers of faulty protection of power line distance iii section
  • Method and device for eliminating hidden dangers of faulty protection of power line distance iii section

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Embodiment Construction

[0043]The method and device for eliminating hidden dangers of misoperation of the protection of the distance section III of the power line provided by the present invention can judge the current state of the circuit according to the electrical characteristics of the power line. For tripping, if the power line is overloaded, the method and device can block phase-to-phase distance or grounding distance section III protection to prevent its misoperation. Avoid blockage of phase distance or grounding distance section III protection incorrect action, etc., resulting in large-scale power outage accidents in the power grid.

[0044] figure 1 It is a schematic flow chart of the first embodiment of the method for eliminating hidden dangers of misoperation of protection of power line distance section III provided by the present invention. The procedure of this method is as follows figure 1 shown, including:

[0045] In step S101, phase-to-phase distance or ground distance stage III p...

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Abstract

The invention discloses an electric power line distance III-section protection misoperation hidden danger eliminating method and device. The electric power line distance III-section protection misoperation hidden danger eliminating method comprises the following steps that phase-to-phase distance III-section protection or ground distance III-section protection enters start-up logic; whether an unsymmetrical fault occurs is judged according to the electrical characteristics of an electric power line, trip of the ground distance III-section protection directly happens when the unsymmetrical fault occurs; trip of the phase-to-phase distance III-section protection directly happens when a symmetrical fault occurs; the electric power line is judged to be overloaded, the phase-to-phase distance III-section protection or the ground distance III-section protection is blocked, and misoperation of the phase-to-phase distance III-section protection or the ground distance III-section protection is avoided when the symmetrical fault occurs. According to the electric power line distance III-section protection misoperation hidden danger eliminating method and device, trip of the phase-to-phase distance III-section protection or the ground distance III-section protection happens when the unsymmetrical fault or the symmetrical fault occurs and the phase-to-phase distance III-section protection or the ground distance III-section protection can be blocked and misoperation of the phase-to-phase distance III-section protection or the ground distance III-section protection can be avoided when the electricity power line overloads.

Description

technical field [0001] The invention relates to the field of electric power technology, in particular to a method and a device for eliminating hidden dangers of misoperation of the distance III section protection of electric power lines. Background technique [0002] Large-scale power outages in the power system are almost always caused by cascading failures. From the perspective of the formation process of previous blackouts, the successive induction of various related events is the main form of manifestation, so the fault spreads rapidly and eventually reaches an uncontrolled state. For power systems in cascading failures, the key evolution characteristics of associated events determine the final development of the system and the final impact of accidents. In the large-scale blackout accident, there are various unpredictable internal and external factors intertwined in the cascading faults, forming the driving force for the expansion of the accident. [0003] External ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26
Inventor 王世祥钱敏
Owner SHENZHEN POWER SUPPLY BUREAU
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