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Method and device used for locating interphase short-circuit of power grid

A technology for phase-to-phase short circuit and distribution network, which is applied in the direction of measuring devices, fault locations, and measuring electricity, and can solve problems such as unsatisfactory high-precision requirements

Inactive Publication Date: 2016-12-07
STATE GRID SHANDONG ELECTRIC POWER CO WUDI COUNTY POWER SUPPLY CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

While the high precision requirement of the method as described is currently unsatisfactory

Method used

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  • Method and device used for locating interphase short-circuit of power grid

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Embodiment 1

[0029] A device for locating phase-to-phase short circuits in a power distribution network, said device having: at least one measurement sub-device distributed over each phase conductor, and an analysis controller connected to each measurement sub-device, which is adapted to use at least one The measured value of the measurement sub-equipment is used to locate the short-circuit position between the phases of the distribution network, and the location includes:

[0030] Measure the voltage and current on each phase of electricity to form a measured value, compare the measured value with a preset threshold, and perform a positioning operation when the measured value exceeds the threshold,

[0031] It is characterized in that the positioning operation includes

[0032] From said measurements, for each phase of the electrical power, determining the harmonic components contained in said measurements and their decay time constants,

[0033] Using the harmonic components and time de...

Embodiment 2

[0052] A device for locating phase-to-phase short circuits in a power distribution network, said device having: at least one measurement sub-device distributed over each phase conductor, and an analysis controller connected to each measurement sub-device, which is adapted to use at least one The measurement value of the measurement sub-device is used to locate the interphase short-circuit position of the distribution network, and each measurement sub-device is assigned a fixed and independent IP address, and the measurement sub-device is connected to the network such as the Internet through its communication interface, and thus also communicates with each other ground in a common standard data link. Wherein the analysis controller can be located in the substation where the main transformer is located, the analysis controller exchanges data with the analysis sub-equipment on site via this network connection, for example measured values ​​of current and voltage at the respective ...

Embodiment 3

[0074] Yet another device for locating the location of a phase-to-phase short circuit in a distribution network, said device having: at least one measurement sub-device distributed on each phase conductor, and an analysis controller connected to each measurement sub-device, which is adapted to use at least The measurement value of a measurement sub-device is used to locate the short-circuit position between phases of the distribution network, and each measurement sub-device is assigned a fixed and independent IP address, and the measurement sub-device is connected to the network such as the Internet through its communication interface, and thus also are mutually in a common standard data link. Wherein the analysis controller can be located in the substation where the main transformer is located, the analysis controller exchanges data with the analysis sub-equipment on site via this network connection, for example measured values ​​of current and voltage at the respective connec...

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Abstract

The invention relates to a method used for locating interphase short-circuit of a power grid. Measured harmonics data of harmonics after the propagation time and propagation distance of a wire are used. The harmonics are retraced according to the advancement pattern characteristics of the waveform. The position information of interphase short circuit is acquired through inverse calculation.

Description

technical field [0001] The present invention relates to a device and a method for locating an event in a power distribution system, in particular to a device and a method for locating a phase-to-phase short circuit of a grid. Background technique [0002] Timely and accurate positioning of short-circuit points can quickly repair lines, ensure reliable power supply, and play a vital role in the safe and stable operation of power systems. Therefore, positioning has always been a research hotspot in the field of power system protection and control. Locating a phase-to-phase short circuit is always difficult and leads to time-consuming manual search operations, since the methods used so far for location identification often do not work correctly. Such as patent CN201510632301 and [0003] CN105182187 all disclose similar positioning (ranging) methods for single-phase or phase-to-phase short circuits in distribution networks based on certain positioning functions. However, the...

Claims

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Application Information

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IPC IPC(8): G01R31/08G01R31/02
CPCG01R31/086G01R31/088G01R31/50
Inventor 韩冰吴中尧常建民郭志豪崔明张希胜张莉李敏王同强李晶孟维玉郭瑞张玉杰曹晓宇赵英李俊静翟建朋王伟
Owner STATE GRID SHANDONG ELECTRIC POWER CO WUDI COUNTY POWER SUPPLY CO
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