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Ground fault location method of petal-type urban power grid based on zero-sequence current correlation

A technology of zero-sequence current and urban power grid, which is applied in the direction of fault location, fault detection according to conductor type, and measurement of electricity, which can solve the problems that it is difficult to meet the rapid economic development and people's livelihood needs in urban areas, and the fault has a large range of influence.

Active Publication Date: 2021-01-26
STATE GRID HEBEI ELECTRIC POWER CO LTD +3
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Most of the traditional urban power grids use radial wiring, and the scope of faults is large, which makes it difficult to meet the rapid economic development and people's livelihood needs in urban areas

Method used

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  • Ground fault location method of petal-type urban power grid based on zero-sequence current correlation
  • Ground fault location method of petal-type urban power grid based on zero-sequence current correlation
  • Ground fault location method of petal-type urban power grid based on zero-sequence current correlation

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Embodiment Construction

[0039] The present invention will be further described in detail below through the specific examples, the following examples are only descriptive, not restrictive, and cannot limit the protection scope of the present invention with this.

[0040] First, in a clockwise direction, number each protection on the trunk line of the single petal ring network in sequence, as shown in figure 2 The main line shown includes 5 lines L1-L5, equipped with 10 protective devices, numbered 1-10 in sequence. In addition, assuming that the lengths of the five lines on the trunk line are equal, since the petal-shaped urban power grid uses the same type of cable on a single petal, the zero-sequence impedance values ​​​​of the five lines are also equal. At the same time, it can be seen that the midpoint of the trunk line is located on the line L3 and is the midpoint of the line L3.

[0041] Secondly, set the zero-sequence current starting value of each protection to judge whether a ground fault o...

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Abstract

The invention relates to a petal type urban power grid grounding fault positioning method based on zero-sequence current association. Single-phase and two-phase grounding fault characteristic analysisis carried out on the petal type urban power grid, and the incidence relation of zero-sequence currents at the two ends of a line where a fault point is located when an earth fault occurs is fully excavated, thus laying a foundation for simply and effectively achieving accurate positioning of the fault location. Accurate grounding fault positioning can be realized only after the zero-sequence current steady-state value of line opposite-end protection is received, a traveling wave measuring device, a signal injection device and the like do not need to be additionally arranged, the required communication traffic is small, the requirement for information synchronism is low, the performance is reliable, and the method is simple and easy 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 petal-type urban power grid grounding fault characteristics, a petal-type urban power grid grounding fault based on zero-sequence current correlation at both ends of the line is proposed. positioning method. Background technique [0002] The urban power grid, which is directly oriented to power users, bears the important responsibility of providing users with high-quality electric energy. Most of the traditional urban power grids adopt the radial connection mode, and the fault affects a large range, which is difficult to meet the rapid economic development and people's livelihood needs in urban areas. With the rapid increase of urban power load density, the requirements for power supply reliability are gradually increasing, and the urban power grid connection mode is gradually developing to single-ring network, double-ri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08G01R31/52
CPCG01R31/086G01R31/088Y04S10/52
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 STATE GRID HEBEI ELECTRIC POWER CO LTD
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