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Power distribution network fault positioning method based on short circuit current

A distribution network fault and short-circuit current technology, which is applied to the fault location, detects faults according to conductor types, and measures electricity. It can solve problems such as different types of wires, responsible structures, and difficulty in establishing a unified model.

Active Publication Date: 2017-06-13
国网江苏省电力有限公司泗洪县供电分公司 +3
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Problems solved by technology

In addition, the 10 kV and 20 kV distribution network lines have many branches, and the structure is relatively responsible, and different sections of the line may have different types of wires, which makes it very difficult to establish a unified model

Method used

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  • Power distribution network fault positioning method based on short circuit current
  • Power distribution network fault positioning method based on short circuit current
  • Power distribution network fault positioning method based on short circuit current

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Embodiment Construction

[0048] The distribution network fault location method based on short-circuit current includes the following steps,

[0049] 1) Using the per-unit values ​​of the large and small square impedances provided by the local and city companies under different operating modes each year, convert them to the large and small square impedances of the 35kV, 20kV, and 10kV buses under different transportation methods unitary value and ;

[0050] a. For 220 kV or 110 kV substation 35 kV bus, 20 kV bus, 10 kV bus,

[0051] ,

[0052] ,

[0053] in: and Provided by local and municipal companies;

[0054] When the 35 kV, 20 kV and 10 kV lines are faulty, the corresponding 220 kV or 110 kV substation is generous, and the equivalent impedance per unit of the 220 kV bus or 110 kV bus;

[0055] Indicates the 220 kV bus or 110 kV bus equivalent impedance p.u. when the 35 kV, 20 kV, and 10 kV lines are faulty;

[0056] Indicates the per unit value of the transformer impedance; ...

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Abstract

The invention provides a power distribution network fault positioning method based on a short circuit current, and relates to power distribution network maintenance and repairing, in particular to a method for quickly looking up a short-circuit fault of a power distribution network. The method comprises the steps that maximum-mode impedance per-unit values and minimum-mode impedance per-unit values in different operation modes are converted into maximum-mode impedance per-unit values and minimum-mode impedance per-unit values of a 35-KV busbar, a 20-KV busbar and a 10-KV busbar in different operation modes; 2, according to an impedance parameter of a fault line, the distance between a short-circuit fault point of the line and an outlet switch of a transformer substation in the current operation mode is calculated. The method is simple and feasible, when the power distribution network line generates the short-circuit fault, the place where the fault point is possibly located can be quickly judged according to the fault current and type and the farthest distance and the closest distance between the short-circuit fault point and the outlet switch of the transformer substation, the distance between the short-circuit fault point and the outlet switch of the transformer substance is accurately positioned, and therefore operation and maintenance personnel can quickly find the fault and isolate or eliminate the fault.

Description

technical field [0001] The distribution network fault location method based on the short-circuit current of the present invention relates to distribution network maintenance and repair, in particular, a method capable of rapidly finding a distribution network short-circuit fault. Background technique [0002] With the reform of the State Grid Corporation's "three sets and five majors" system, the county-level company dispatching agency mainly governs the power grid of 35 kV and below, and the power grid lines of 35 kV and below are mainly equipped with three-stage current protection. When a short-circuit fault occurs, the protection device Only record short-circuit phase difference and fault current. Like the 110 kV and above lines, the possible fault points will not be given by the fault recorder. In addition, the 10 kV and 20 kV distribution network lines have many branches, and the structure is relatively responsible, and different sections of the line may have different...

Claims

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Application Information

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IPC IPC(8): G01R31/08
CPCG01R31/086G01R31/088Y04S10/52
Inventor 王延萌张译元蔡同超王秀茹
Owner 国网江苏省电力有限公司泗洪县供电分公司
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