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Power distribution network fault positioning method

A technology of distribution network fault and location method, applied in fault location, information technology support system, etc., can solve the problem of low fault location accuracy, and achieve the effect of improving intelligence, high reliability, and improving accuracy

Active Publication Date: 2009-10-07
JIANGSU ELECTRIC POWER CO +2
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  • Summary
  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

[0005] The above-mentioned existing technology adopts the traditional electrical signal monitoring method, and the judgment method is too simple, and there are certain limitations in the use in the small current grounding system. Phase-to-ground fault, the accuracy of fault location is low

Method used

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Embodiment Construction

[0027] The embodiments of the present invention are described in detail below: the present embodiment is implemented under the premise of the technical solution of the present invention, and detailed implementation and specific operation process are provided, but the protection scope of the present invention is not limited to the following implementation example.

[0028] This embodiment includes the following steps:

[0029] first step, such as figure 1 As shown, the resistor 3 in parallel connection is installed in the substation, the resistor 3 in parallel connection and the vacuum contactor 4 are connected in series between the neutral point of the transformer 9 in the substation and the ground wire 10, and the voltage transformer is connected to the transformer 9 in the substation The neutral point of the transformer is connected in parallel with the resistance 3 and the vacuum contactor 4 , and the arc suppression coil 8 is connected between the neutral point of the tra...

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Abstract

A power distribution network fault positioning method belong to the power generation and power network technology field, comprises: installing parallel connected middle resistors, vacuum contactor, monitoring terminal, voltage transformer and zero sequence current transformer; when a permanent earth fault occurs in the power distribution network, switching the middle resistors within a preset time; the monitoring terminals in the transformer station, switching station and distribution substation uploading the node voltage values before and after switching the parallel connected middle resistors and the zero sequence currents on the outer wires to the fault positioning monitoring platform; positioning by the fault determination method, and displaying the fault position points in the dynamic topology map of the power distribution network system. The invention avoids the deficiencies of current fault positioning products when applied in small current grounding system, causes the fault determination more intelligent and more accurate, is an ideal fault positioning method for small current grounding system.

Description

technical field [0001] The present invention relates to a method in the technical field of power generation grid, in particular to a fault location method for distribution network. Background technique [0002] In the 6-66kV distribution network system, the neutral point is usually grounded through the arc suppression coil. This grounding method can effectively suppress the arc ground fault and reduce the overvoltage level of the system. Fault line selection and location have brought difficulties. At present, there are many fault location products in the existing technology. This kind of products can find out the faulty line or faulty section by sampling the zero-sequence current, fifth harmonic and other signals at the line switch, according to a certain judgment method, so as to realize fault location. . Due to the small fault current of the small current grounding system of the distribution network and the complex structure of the power grid, the fault signal volume is ...

Claims

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Application Information

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IPC IPC(8): G01R31/08
CPCY04S10/522Y04S10/52
Inventor 吴鸿飞李刚罗晓魏立新谢楠
Owner JIANGSU ELECTRIC POWER CO
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