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Method and device for quickly locating faults of overhead line on basis of time synchronization

A time synchronization and fault location technology, applied in fault location, information technology support system, etc., can solve problems such as affecting signal detection, fast signal attenuation, weak injection signal, etc., to achieve flexible power supply, fault distance judgment, and accurate fault distance. Effect

Active Publication Date: 2012-07-18
STATE GRID CORP OF CHINA +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this method, due to the weak injection signal and the influence of the line-to-ground capacitance, in the case of high-impedance grounding, the signal on the primary side attenuates quickly, which directly affects the detection of the signal.

Method used

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  • Method and device for quickly locating faults of overhead line on basis of time synchronization
  • Method and device for quickly locating faults of overhead line on basis of time synchronization
  • Method and device for quickly locating faults of overhead line on basis of time synchronization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Such as figure 1 , figure 2 As shown, the distributed voltage data acquisition unit is installed on the outgoing line of the distribution line or on the secondary side of the bus voltage transformer of each section of the substation 1, and collects line voltage and zero-sequence voltage data. Distributed current data acquisition units 2 are installed in groups of three on the three power distribution overhead lines 3 of A, B, and C, and one group is installed at intervals of 20-2000 meters along the trunk lines or branch lines of the detected overhead lines to collect current data.

[0038] Such as image 3As shown, the distributed data acquisition unit at least includes an electrically connected induction coil, a protection conditioning circuit, a data acquisition circuit, a memory, a microprocessor, a wireless communication circuit, a power management circuit and a time reference generation circuit, the wireless communication circuit and the main station The wirel...

Embodiment 2

[0053] When the voltage data acquisition unit detects that the zero-sequence voltage of the line rises, a ground fault occurs on the line, the voltage data acquisition unit records the time when the fault occurs, and transmits the time to the master station through the wireless network, and the master station receives the information After that, send a data freeze command to the distributed current data acquisition unit installed at the outgoing line of the substation, and the distributed current data acquisition unit at the outgoing line of the substation will forward it to each distributed current data acquisition unit below the data link through wireless relay. Data freeze command until the last node of the network. Each distributed current data acquisition unit executes the freeze command to freeze the current steady-state and transient data collected before and after the fault time.

[0054] The master station requests fault data from the distributed voltage data acquisit...

Embodiment 3

[0056] When the distributed current data acquisition unit detects that the current of the line exceeds the set fault value, a short-circuit fault occurs on the line, and the distributed current data acquisition unit records the time when the fault occurs, and judges the generation and distribution of the line exit of the substation The current data acquisition unit will transmit the information to the master station through the wireless network. After receiving the information, the master station will send a data freeze command to the distributed current data acquisition unit installed at the outlet of the substation, and the distributed current data acquisition at the outlet of the substation will The unit will forward the data freezing command to each distributed current data acquisition unit under the data link through wireless relay until the last node of the network. Each distributed current data acquisition unit executes the freeze command to freeze the current steady-sta...

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Abstract

A method and a device for quickly locating faults of an overhead line on the basis of time synchronization belong to the technical field of intelligent grid distribution automation. The method for quickly locating the faults of the overhead line on the basis of time synchronization comprises a distribution overhead line and a master station and is characterized in that a plurality of distribution data collection units arranged on the distribution overhead line collect voltage signals of the distribution overhead line and current signals of each branch through the time synchronization technology, collected data with time labels are transmitted back to the master station to achieve calculation and judgment on the branch where the faults happen, and position information of a fault interval and the fault state of a line are displayed. The device consists of the distribution data collection units, a time reference unit, a communication system and a master station system. By utilizing the method, the device can automatically judge a fault section of a power supply line, provide the position information of the fault interval, especially improve accuracy of single-phase grounding fault judgement, replace with small current grounding routing system of a transformer station, reduce a power failure range, shorten line reparation time, and improve power supply reliability of a power supply system.

Description

technical field [0001] The invention belongs to the technical field of distribution automation of smart grids, and specifically relates to a time synchronization-based rapid fault location method for overhead lines and a device for realizing the method. Background technique [0002] In my country's distribution network, the neutral point is not grounded or the neutral point is grounded through the arc suppression coil. In these power grids, the single-phase ground fault is one of the most common faults, and the fault rate is the highest. The fault can be quickly and accurately found and eliminated. Faults are beneficial to the safe, reliable and economical operation of the power grid and the realization of distribution automation. The current traditional distribution line fault location technology generally uses line fault indicators for fault location, but this location method is only effective for phase-to-phase short-circuit faults, and is not suitable for single-phase gro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
CPCY04S10/522Y04S10/52
Inventor 杨春雷王增君杨学杰于景岳王风伟赵延华陈宗军李卒祥李桂义
Owner STATE GRID CORP OF CHINA
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