High-voltage transmission line protection starting element based on transition resistance and change rate thereof

A technology of high-voltage transmission lines and transition resistance, applied in the direction of electrical components, emergency protection circuit devices, etc., can solve problems such as failure to start, and achieve the effects of avoiding refusal, improving reliability, and improving sensitivity

Pending Publication Date: 2022-05-13
XIAN UNIV OF TECH
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Problems solved by technology

[0006] The purpose of the present invention is to provide a high-voltage transmission line protection starting element based on transition resistance and its rate of change, so as to solve the problem in the prior art that the sudden change starting element and the zero-sequence current st...

Method used

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  • High-voltage transmission line protection starting element based on transition resistance and change rate thereof
  • High-voltage transmission line protection starting element based on transition resistance and change rate thereof
  • High-voltage transmission line protection starting element based on transition resistance and change rate thereof

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Embodiment

[0081] The schematic diagram of the single-phase high-resistance ground fault line of the applicable high-voltage transmission line is as follows: Figure 5 As shown, when the high-voltage transmission line protection starting element based on the transition resistance and its rate of change of the present invention is used for protection, the time for identifying the transition resistance is determined according to local conditions. When the high-voltage transmission line passes through the plain area, it is set to every T 1 Identify primary transition resistance. When high-voltage transmission lines pass through forested areas or mountainous areas, single-phase high-resistance grounding faults caused by high-voltage transmission lines touching trees and wildfires are prone to occur. Therefore, it is set to identify transition resistance every T. where T 1 >T 2 , in this example T 1 = 100ms, T = 20ms.

[0082] Let the corresponding minimum change rate of transition resista...

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Abstract

The invention discloses a high-voltage transmission line protection starting element based on a transition resistor and a change rate of the transition resistor. When a high-voltage transmission line discharges to surrounding branches and moso bamboos due to factors such as insulator flashover, lightning stroke and mountain fire or discharges through mountain flame, a single-phase high-resistance grounding fault is caused. By calculating the transition resistance and utilizing the transition resistance to start the protection of the high-voltage transmission line, the defects of the existing starting element are overcome, the sensitivity of the protection starting element is effectively improved, the operation refusal of the protection is avoided, and the reliability of the whole group of protection is improved.

Description

technical field [0001] The invention belongs to the technical field of electric power system relay protection, and in particular relates to a high-voltage transmission line protection starting element based on transition resistance and its change rate. Background technique [0002] The transmission line is an integral part of the power system. It is responsible for the task of transmitting and distributing electric energy. The main task of the starting element is to activate the protection device or enter the fault calculation program when a short-circuit fault occurs on the transmission line. [0003] Due to the reverse distribution of power supply and load in China, it is necessary to use long-distance transmission lines. Multiple transmission lines need to pass through densely vegetated forest areas and mountainous areas. High-resistance single-phase grounding has been caused many times due to flame grounding, moso bamboo grounding, or treetop grounding. Fault. This kind...

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Application Information

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IPC IPC(8): H02H7/26
CPCH02H7/26H02H7/263
Inventor 梁振锋孙思洁王晓卫张惠智潘忠美
Owner XIAN UNIV OF TECH
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