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Power distribution network broken line grounding composite fault protection method considering transition resistance

A composite fault and transition resistance technology, which is applied in emergency protection devices for automatic disconnection, protection for under-load or no-load response, fault location, etc., can solve the problems of small application range and insufficient sensitivity, and achieve high sensitivity, The effect of expanding the scope of protection and clarifying the implementation method

Active Publication Date: 2021-06-22
CHONGQING UNIV
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Problems solved by technology

[0006] Aiming at the deficiencies of the above-mentioned prior art, the present invention provides a distribution network disconnection and grounding compound fault protection method considering transition resistance, which effectively solves the problem of the small application range and insufficient sensitivity of the distribution network disconnection fault protection in the prior art Reliable identification of disconnection and grounding compound faults can be realized in the full range of transition resistance

Method used

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  • Power distribution network broken line grounding composite fault protection method considering transition resistance
  • Power distribution network broken line grounding composite fault protection method considering transition resistance
  • Power distribution network broken line grounding composite fault protection method considering transition resistance

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Embodiment Construction

[0034] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0035] Such as figure 1 As shown, the present invention discloses a method for protection of distribution network disconnection and grounding complex faults considering transition resistance, including:

[0036] S1. Collect the three-phase current at the outlet of each feeder line,

[0037] S2. Calculate the negative-sequence current amplitude and / or zero-sequence current amplitude at each feeder outlet based on the three-phase current at each feeder outlet;

[0038] Negative sequence current amplitude I at the exit of the kth feeder line k2 Calculate according to the following formula:

[0039]

[0040] Zero-sequence current amplitude I at the exit of the kth feedback line k0 Calculate according to the following formula:

[0041]

[0042] In the formula, is the three-phase current at the exit of the kth feedback line; operator a=e j120 .

[0043...

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Abstract

The invention discloses a power distribution network broken line grounding composite fault protection method considering transition resistance, and the method comprises the steps: firstly collecting the three-phase current of each feed line outlet, and calculating the negative-sequence current amplitude and / or zero-sequence current amplitude of each feed line outlet based on the three-phase current of each feed line outlet; comparing the amplitude of the negative-sequence current at the outlet of each feeder line with the corresponding negative-sequence current setting value, and / or comparing the amplitude of the zero-sequence current at the outlet of each feeder line with the corresponding zero-sequence current setting value; and if yes, determining a faulty feeder line based on a comparison result and sending a corresponding tripping command and / or an alarm signal. According to the method, the problems of small application range and insufficient sensitivity of existing broken line protection are solved, the influence of factors such as broken line fault types, load size and distribution, fault positions and the like is considered, and the broken line grounding composite fault can be reliably identified in the full range of transition resistance.

Description

technical field [0001] The invention relates to the field of relay protection of electric power systems, in particular to a method for protection of distribution network disconnection and grounding complex faults considering transition resistance. Background technique [0002] The distribution network plays the role of electric energy distribution in the power system, and its power supply reliability and quality directly affect industrial production and social and economic development, and are also closely related to people's quality of life. Affected by the idea of ​​"emphasizing distribution and despising distribution", the distribution network is relatively lagging behind in terms of investment construction and automation level. In recent years, with the rapid development of the economy and the increasing demand for electricity, it has become an inevitable trend to vigorously develop environmentally friendly and abundant renewable energy. A large number of new energy sou...

Claims

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Application Information

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IPC IPC(8): G01R31/52G01R31/60G01R31/08H02H3/13H02H3/14H02H7/26
CPCG01R31/52G01R31/60G01R31/083G01R31/088H02H7/26H02H3/13H02H3/14Y04S10/52
Inventor 欧阳金鑫肖扬熊小伏
Owner CHONGQING UNIV
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