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Method for ensuring distance protection backup segment without excess load influence

A distance protection and backup technology, which is applied to emergency protection circuit devices, electrical components, etc., and can solve problems such as overload and misoperation of the backup section

Active Publication Date: 2011-09-14
北京衡天北斗科技有限公司
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the problem that the distance protection backup section in the prior art is likely to cause overload and misoperation, the invention content of the present invention is as follows:

Method used

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  • Method for ensuring distance protection backup segment without excess load influence
  • Method for ensuring distance protection backup segment without excess load influence
  • Method for ensuring distance protection backup segment without excess load influence

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Embodiment Construction

[0040] The third section of the distance protection of the present invention shares 7 relays (7 criteria), and supplements the distance relays for responding to the failure of the low-voltage side of the step-down transformer at the opposite end of the line as required:

[0041] 1. Three distance relays Z that respond to single-phase faults A ,Z B ,Z C , the present invention emphasizes that it is necessary to increase the corresponding zero-sequence current I 0 and zero sequence voltage U 0 The relays form the "AND" gate outlet, the logic diagram is as follows image 3 shown.

[0042] 2. Three distance relays Z that respond to two-phase faults AB ,Z BC ,Z CA , the present invention emphasizes that it is necessary to increase the reaction negative sequence current I 2 and negative sequence voltage U 2 The relays form the "AND" gate exit. Logical relationship such as Figure four shown.

[0043] 3. A brand new distance relay Z that responds to three-phase faults 3φ...

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Abstract

The invention discloses a method of a distance protection backup section with no feedback and overload. In the backup section protection with distance protection, three earthing distance relays Zphi (namely ZA, ZB, ZC) with feedback single phase failure, three interphase distance relays Zphi phi (namely ZAB, ZBC, ZCA) with feedback interphase short failure and a distance relay Z3phi with feedback three-phase failure are included and used to continuously monitor line voltage, current and zero sequence voltage (U0), zero sequence current (I0), negative sequence voltage (U2), and negative sequence current (I2). According to different failure types, corresponding assistant criteria relay starts up the distance relay in the distance protection backup section to reach the purpose of making the non-feedback line of the distance protection backup section overload, at the same time increasing the backup protection, namely the IVth section, which plays backup protection action for the low voltage side failure of a side transformer. The method of the invention well overcomes the problem that the distance protection overload is falsely tripped, which has important significance for the stable operation of the power system.

Description

technical field [0001] The invention relates to a relay protection technology for safe and stable operation of electric power systems, in particular to a relay protection method for distance protection of high-voltage transmission lines without responding to overload. Background technique [0002] In the previous blackout accidents in the world, the backup section in the distance protection of high-voltage lines, that is, the third section of the distance protection, was accidentally tripped due to overload, which was an important reason for expanding the accident or even causing the accident. This issue is now gradually attracting widespread attention and attention from all parties (see "Application of Power Grid Relay Protection" by China Electric Power Press in 1999 and "Operation and Design of High Voltage Power Grid Relay Protection" by China Electric Power Press in 2007). The conclusions drawn respectively are that the maximum load to be avoided in section III of the d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26
Inventor 朱声石马师模朱庆翔
Owner 北京衡天北斗科技有限公司