Protection method for turn-to-turn short circuit fault of controllable reactor

An inter-turn short-circuit fault and reactor technology, which is used in fault locations, emergency protection circuit devices, and fault detection by conductor type, etc., can solve problems such as difficult to detect faults, difficult to detect, and insufficient sensitivity to improve reliability. , the effect of improving accuracy and improving sensitivity

Inactive Publication Date: 2021-06-22
江苏益邦电力科技有限公司
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Problems solved by technology

[0005] The structure of the controllable reactor is relatively complex, and the failure rate is higher than that of other equipment with the same voltage level, especially the turn-to-turn fault of the controllable reactor body. It is a very common fault, and it is also difficult to detect. high

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  • Protection method for turn-to-turn short circuit fault of controllable reactor
  • Protection method for turn-to-turn short circuit fault of controllable reactor
  • Protection method for turn-to-turn short circuit fault of controllable reactor

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Embodiment Construction

[0036] Embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings.

[0037] Such as figure 1 As shown, a controllable reactor turn-to-turn short-circuit fault protection method, including:

[0038] Step 1: Obtain the electrical quantity of the controllable reactor: grid-side three-phase voltage three-phase current Control side three-phase current figure 2 Display the position of the electrical quantity value of the controllable reactor, and the electrical quantities of the controllable reactor control side turn-to-turn short circuit are shown in Table 1. (A-G indicates a phase-to-ground fault in the external line of the controllable reactor.)

[0039] Table 1 When the full capacity is compensated, the electrical quantities of the controllable reactor control side turn-to-turn short circuit

[0040]

[0041]

[0042] Step 2: Calculate the zero-sequence current on the control side Grid side negat...

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Abstract

The invention discloses a protection method for a turn-to-turn short-circuit fault of a controllable reactor. The protection method comprises the following steps of 1, acquiring the electrical quantity of the controllable reactor, namely the grid-side three-phase voltage, three-phase current and the control-side three-phase current; 2, calculating the control side zero-sequence current, the network side negative-sequence voltage and the negative-sequence current according to the electrical quantity; 3, taking the control side zero-sequence current as a protection starting threshold to carry out protection starting judgment; 4, calculating a negative sequence power direction angle by using the grid-side negative sequence voltage and the negative sequence current, and taking the negative sequence power direction angle as a judgment basis of a fault position; and 5, when a small turn-to-turn fault occurs, processing the negative sequence power direction angle by using a dynamic mean value method, and then judging the fault occurrence position in the system. According to the protection method, the control side zero sequence current and the grid side negative sequence power direction principle are combined, so that the sensitivity of the control side turn-to-turn short circuit protection of the controllable reactor can be improved; the problem of negative sequence power direction angle fluctuation during small turn-to-turn short circuit is solved by adopting a dynamic mean value method, and the protection reliability 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 protection method for inter-turn short-circuit fault of a controllable reactor. Background technique [0002] The rapid development of the economy has led to an increase in electricity consumption. However, the power production center and the power load center are far away, and the nearby supply of electric energy cannot be realized, and a large-capacity, long-distance transmission system is required to transmit electric energy. With the continuous increase of transmission capacity, the existing ultra-high voltage transmission system has already faced the problem of insufficient transmission capacity. It is necessary to develop a UHV transmission system to solve such problems and form a grid layout with the UHV transmission system as the backbone grid. Solve the problem of uneven spatial distribution of electricity load, and truly ach...

Claims

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Application Information

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IPC IPC(8): H02H7/26G01R31/08H02J3/16
CPCG01R31/086H02H7/26H02J3/16Y02E40/30Y04S10/52
Inventor 赵俊平朱礼蔚王一凡王雷徐侠梅志翔王从杰
Owner 江苏益邦电力科技有限公司
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