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Adaptive protection method and system for distribution lines based on traveling waves

A self-adaptive technology for power distribution lines, applied in emergency protection circuit devices, electrical components, fault detection according to conductor types, etc., can solve problems such as system overvoltage, and achieve accurate and reliable actions

Active Publication Date: 2019-12-10
GUIZHOU POWER GRID CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

2. Line selection technology only deals with single-phase ground faults, not for two-phase faults and three-phase faults; 3. Failure to handle single-phase ground faults in time may lead to overvoltage in the system
However, the research in the literature only focuses on single-phase ground faults and does not involve other faults on distribution lines, so in practical applications, the proposed protection needs to cooperate with traditional overcurrent protection

Method used

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  • Adaptive protection method and system for distribution lines based on traveling waves
  • Adaptive protection method and system for distribution lines based on traveling waves
  • Adaptive protection method and system for distribution lines based on traveling waves

Examples

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Embodiment

[0069] (1) Single-phase grounding fast identification algorithm

[0070] The rapid identification of single-phase ground faults requires the use of traveling wave characteristics of single-phase ground faults and non-single-phase ground faults.

[0071] The zero-sequence current traveling wave / zero-sequence voltage traveling wave is a unique feature of the ground fault, so the ground fault (single-phase ground and two-phase ground) and non-ground fault (two-phase phase-to-phase short circuit and identification of three-phase faults).

[0072] Further, the identification of single-phase grounding and two-phase grounding needs to use the characteristics of the three-phase current traveling wave. There is a significant difference in fault traveling wave characteristics at the measurement point close to the busbar and at the measurement point far away from the busbar. Therefore, two sets of algorithms are used for the measurement points set near the busbar and far away from the ...

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PUM

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Abstract

The present invention discloses a distribution line adaptive protection method and system based on traveling waves, belonging to the technical field of line protection. At measurement points, far awayfrom a bus, of a fault line, the fault phase initial current traveling waves of the single-phase grounding faults are large, and the non-fault phase is zero; at measurement points, close to the bus,of the fault line, the fault phase initial traveling wave amplitude of the single-phase grounding faults are twice of the non-fault phase, and the polarity is opposite. At the measurement points, faraway from the bus, of the fault line, the fault phase initial current traveling waves of the two-phase grounding faults are large, and the non-fault phase is zero; and at the measurement points, closeto the bus, of the fault line, the initial current traveling waves of the fault phase and the non-fault phase of the two-phase grounding faults have no obvious features. The distribution line adaptive protection scheme can perform accurate and reliable motions for all the types of short-circuit faults. The propagation of the initial traveling waves cannot be influence by a grounding resistance condition, and therefore, the protection scheme can respond to the high-resistance grounding faults.

Description

technical field [0001] The invention relates to a traveling wave-based self-adaptive protection method and system for power distribution lines, belonging to the technical field of line protection. Background technique [0002] A phase-to-earth fault in a system with a non-effectively grounded neutral point is characterized differently from other short-circuit faults. Single-phase grounding does not constitute a short-circuit loop, and there is no significant change in power frequency current. The overcurrent protection applicable to other short-circuit faults cannot protect single-phase grounding. This paper proposes a single-phase ground fault identification algorithm based on traveling wave characteristics. The proposed algorithm can accurately identify single-phase ground faults and non-single-phase ground faults. And on this basis, a distribution line protection scheme that can adapt to all short-circuit types is formed. [0003] Single-phase ground faults account for ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26G01R31/08
CPCG01R31/085H02H7/26
Inventor 何鑫钱其隆王永刚王宇恩蒲超廷杨万锦施慎行董新洲
Owner GUIZHOU POWER GRID CO LTD
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