Distribution line fault identification apparatus based on voltage monitoring

A technology for power distribution lines and fault identification. It is applied to measurement devices, fault locations, and fault detection according to conductor types. It can solve problems such as different currents, different three-phase line load currents, and unrealistic problems.

Inactive Publication Date: 2017-07-28
WUHAN SHUANGWEI ELECTRICAL TECH +1
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Problems solved by technology

[0004] So far, my country's power system has widely adopted the technology based on line current monitoring to monitor distribution line faults. Among them, the zero-sequence current is mainly synthesized by three-phase current recording, and then the fault is judged, classified, and Infer the location of the fault; the premise of the application of this technology is that the three-phase current is required to be symmetrical when the line is working normally; the actual problem here is that the loa...

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  • Distribution line fault identification apparatus based on voltage monitoring
  • Distribution line fault identification apparatus based on voltage monitoring

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Embodiment Construction

[0028] 5.1 Default assignment variables define fault category strings

[0029] Define the effective value status of the distribution network high-voltage line voltage monitoring cycle: take the value of phase A as an example, and the same for phase B and C.

[0030] A0--effective value of phase A voltage cycle < U 20%, A1--effective value of phase A voltage cycle is normal value U (1±5%), A2--effective value of phase A voltage cycle U(1 / 2±10%), A3----the effective value of phase A voltage cycle is U(1.73±10%), A4----the effective value of phase A voltage cycle is

[0031] Three-phase state variable E of the monitoring point after the single-phase ground fault ground point: A0, B0, C0 (or phase A or phase B or phase C is grounded);

[0032] Phase A is grounded (A0 and B=U(1.73±10%), C=U(1.73±10%), define the string EA----A0B3C3;

[0033] Phase B is grounded (B0 and A=U(1.73...

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Abstract

The invention relates to a distribution line fault identification apparatus based on voltage monitoring. The distribution line fault identification apparatus based on voltage monitoring is characterized in that the distribution line fault identification apparatus based on voltage monitoring acquires the voltage of three-phase lines at the same time; when one phase or multi phases of the lines malfunction, the distribution line fault identification apparatus based on voltage monitoring automatically extracts the data of the forward and backward periods, analyzes the self voltage state of the three phases according to the synchronous period, and determines the practical corresponding different fault types of different combinations of the three-phase voltage state, so that the distribution line fault identification apparatus based on voltage monitoring can identify the following no less than 7 types of faults of the distribution line at the same time: single-phase grounding, single-phase disconnection, two-phase short circuit, two-phase short circuit grounding, three-phase short circuit, three-phase short circuit grounding and instantaneous interference fault.

Description

[0001] A technical field [0002] The technology of the present invention belongs to the field of power distribution network automation in power systems, and specifically belongs to the on-line monitoring of power distribution lines and the judgment, identification and classification of various faults, so as to deal with faults in time and restore the safe power supply of the power grid in time. [0003] Two background technology [0004] So far, my country's power system has widely adopted technology based on line current monitoring to monitor distribution line faults, mainly through three-phase current recording and synthesizing zero-sequence current, and then judging faults, classifying faults, Infer the location of the fault; the premise of the application of this technology is that the three-phase current is required to be symmetrical when the line is working normally; The three-phase current of each line is more difficult to balance at different instants, so that the zero-s...

Claims

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Application Information

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IPC IPC(8): G01R31/08G01R31/02G01R19/252
CPCG01R19/252G01R31/085G01R31/50Y04S10/52
Inventor 贺贵明
Owner WUHAN SHUANGWEI ELECTRICAL TECH
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