Petal type urban power grid grounding fault accurate positioning method based on multi-line zero-sequence current information

A zero-sequence current, urban power grid technology, applied in the fault location, detecting faults by conductor type, and detecting the appearance of fluid at the leak point, etc., can solve the problems of the accuracy of the fault location method and the accuracy of the fault location. Reliable performance, less communication, and accurate ground fault location

Active Publication Date: 2020-04-28
TIANJIN UNIV +3
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Problems solved by technology

However, this method does not consider the impact of load impedance and distributed power. When the load and distributed power are connected to the grid, the zero-sequence impedance of the load and the distributed power step-up transformer will change the magnitude of the zero-sequence current flowing on the line. The a

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  • Petal type urban power grid grounding fault accurate positioning method based on multi-line zero-sequence current information
  • Petal type urban power grid grounding fault accurate positioning method based on multi-line zero-sequence current information
  • Petal type urban power grid grounding fault accurate positioning method based on multi-line zero-sequence current information

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[0037] The technical solution of the invention will be described in detail below with reference to the examples shown in the drawings.

[0038] First, in a clockwise direction, the protections on the backbone of the single petal ring network are numbered in turn. As shown in Figure 1, the backbone includes 5 lines L1 to L5, each with a protection device at both ends, a total of 10 A protection device, serially numbered from 1 to 10. In addition, assuming that the loads and distributed power sources connected to the 4 switch stations are the same, and the lengths of the 5 lines on the main trunk line are all the same, because the petal type urban power grid uses the same type of cable on a single petal, there are 5 lines The zero sequence impedance values ​​are also equal. It can be seen that the balance point position on the main trunk line is located on the line L3 and is the midpoint position of the line L3.

[0039] Secondly, set the starting value of each protection zero sequ...

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Abstract

The invention relates to a petal type urban power grid grounding fault accurate positioning method based on multi-line zero-sequence current information. Single-phase and two-phase earth fault characteristic analysis is carried out on a petal type urban power grid, and a foundation is laid for simply and effectively realizing accurate positioning of a fault position by utilizing a zero-sequence current association relationship presented by connecting two ends of a trunk line of a single petal ring network to the same bus. Accurate grounding fault positioning can be realized only after the centralized information processing center receives the zero-sequence current steady-state values of the protections on the trunk line, a traveling wave measuring device and the like are not required to beadditionally arranged; and the method has the characteristics of low required communication traffic, low requirement on information synchronism and the like and is reliable in performance, simple andeasy to implement.

Description

technical field [0001] The invention belongs to the field of power system distribution network protection and control. Based on the analysis results of the ground fault characteristics of the petal-type urban power grid, a petal-type urban power grid ground fault accurate positioning method based on the zero-sequence current information of multi-section trunk lines is proposed. Background technique [0002] The urban power grid is directly oriented to power users and undertakes the important responsibility of providing users with high-quality electric energy. It is an indispensable part of the power system. With the rapid development of cities, the density of electricity loads in cities is increasing rapidly, and the requirements for the reliability of urban power supply are gradually increasing. Due to the large range of faults in traditional radial urban power grids, it is increasingly difficult to meet the needs of people's livelihood. Urban power grid wiring The way grad...

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Application Information

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IPC IPC(8): G01M3/08G01R31/52
CPCG01R31/086G01R31/088
Inventor 陈晓龙袁姝赵自刚王强任江波常风然耿少博何亚坤李仲青杨国生蒋帅李永丽李斌李博通
Owner TIANJIN UNIV
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