Method for positioning faults of power distribution network based on amplitude analysis of three-phase current

A distribution network fault and three-phase current technology, which is applied to the fault location, detects faults according to conductor types, and measures electricity. It can solve the problems of small electrical components, poor accuracy of distribution network, and affecting fault location. The method is simple , avoid errors, high promotion value effect

Inactive Publication Date: 2017-05-10
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Application Information

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Problems solved by technology

They may affect the location of faults because the electrical components are too small, the time delay is too long, or because the sampling frequency is too high and they are susceptible to external fluctuations
[0005] In recent years, an analysis method based on the transient current direction of the three-phase nodes of the line has been proposed. By comparing whether the direction of the three-phase transient current is the same, it is determined whether the point is a fault node, and by comparing the direction of the

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  • Method for positioning faults of power distribution network based on amplitude analysis of three-phase current
  • Method for positioning faults of power distribution network based on amplitude analysis of three-phase current
  • Method for positioning faults of power distribution network based on amplitude analysis of three-phase current

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[0033] The content of the invention will be further explained below with reference to the drawings and examples.

[0034] As attached figure 1 As shown, figure 1 A small current single-phase grounding fault system model built for power transient simulation software ATP, where CT is a current transformer installed on a three-phase line, including CTⅠ1, CTⅠ2, CTⅡ1, CTⅢ1, CTⅣ1, and CTⅣ2 It is the current detection transformer of this simulation model. A current transformer is installed at the head end of each branch circuit except the bus bar, and one or more detection points are set for different lengths of the line. In this example, CTIV1 and CTIV2 are current transformers set on the fault path. The named detection points are X0001, X0016, CTⅠ1 is a current transformer set on a non-fault path, and the named detection point is X0036. The test simulates the occurrence of a fault in 0.1s and conducts an accuracy test.

[0035] When a single-phase ground fault occurs in a small-current...

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Abstract

The invention relates to a method for positioning faults of a power distribution network based on the amplitude analysis of a three-phase current. The method comprises the steps of collecting the three-phase current of the power distribution network in real time, carrying out amplitude analysis on phase current of each phase before and after a single-phase earth fault once the single-phase earth fault occurs, carrying out deviation calculation by collecting phase currents with the same phase position at a starting moment so as to realize the amplitude calculation of a current phasor, simultaneously filtering the influences of load currents and interphase capacitance currents, and calculating a valid value of the change of each phase current. A monitoring device mounted at a certain point of a circuit can detect whether a detection point is located at a fault route by analyzing the change amount of the amplitude of the three-phase current. Based on the amplitude characteristics of the three-phase current after the single-phase earth fault occurs, a zero sequence current does not need to be synthesized, so that the analytical calculation quantity of a main station is reduced; and the method has relatively high practical values in the engineering.

Description

[0001] Patent field [0002] The invention belongs to the technical field of electric power automation, relates to the field of single-phase grounding faults in distribution networks, and specifically relates to a distribution network fault location method based on three-phase current amplitude analysis. Background technique [0003] The distribution network plays an important role in distributing electric energy in the power network. With the continuous expansion of the distribution network, the large-area use of power electronic devices and the access of distributed power sources make the structure of the distribution network increasingly complex. The single-phase-to-ground fault location accuracy in the distribution network has a certain impact. At present, my country's 6-35kV medium voltage distribution network generally adopts the method of ungrounded neutral point or grounded neutral point through arc suppressing coil, and the frequently occurring single-phase ground fau...

Claims

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Application Information

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IPC IPC(8): G01R31/08
CPCG01R31/086G01R31/088
Inventor 齐郑庄舒仪郑宇航
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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