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Data synchronization method and related device for current differential protection of AC line

An AC line, data protection technology, applied in emergency protection circuit devices, circuit devices, components of emergency protection devices, etc., can solve the problems of current differential protection misoperation, inconsistent delay of transmission and reception channels, etc.

Active Publication Date: 2021-08-27
POWER DISPATCHING CONTROL CENT OF GUANGDONG POWER GRID CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] This application provides a current differential protection data synchronization method and related devices for AC lines, which are used to solve the problem that in the existing channel-based data synchronization technology, channel multiplexing easily leads to inconsistent delays of the sending and receiving channels, which makes the current differential protection malfunction. dynamic technical issues

Method used

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  • Data synchronization method and related device for current differential protection of AC line
  • Data synchronization method and related device for current differential protection of AC line
  • Data synchronization method and related device for current differential protection of AC line

Examples

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Embodiment 1

[0053] For ease of understanding, see figure 1 , Embodiment 1 of a current differential protection data synchronization method for an AC line provided by the present application, including:

[0054] Step 101. When the AC line fails, calculate the difference between the measured voltage effective values ​​of the three-phase line before and after the starting element is activated, and select the largest phase corresponding to the maximum value of the measured voltage effective value difference.

[0055] It should be noted that the purpose of calculating the difference between the effective value of the measured voltage is to determine the fault phase in the three-phase AC line, and the phase with the largest difference between the effective value of the measured voltage is the fault phase, that is, the largest phase. After determining the fault phase, you can Targeted data acquisition, and calculation and analysis operations.

[0056] Further, before step 101, it also includes:...

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Abstract

This application discloses a current differential protection data synchronization method of an AC line and a related device. The method includes: first judging the faulty phase of the three-phase line through the starting condition of the starting element; then using the sending end of the faulty phase to measure the voltage and related The line parameter calculation is the voltage change of the receiving end, that is, the calculated voltage; finally, the waveform matching can be performed between the target measured voltage before and after the starting element of the receiving end and the calculated calculated voltage, and the maximum value of the calculated waveform similarity can be obtained. The sampling time error between the AC lines on both sides, that is, the time error, the operation process is easy to execute, the calculation is simple, and the obtained data is highly reliable. In addition, the entire process of the scheme does not depend on the consistency of the data sending and receiving channels. Therefore, the present application solves the technical problem that in the existing channel-based data synchronization technology, channel multiplexing easily leads to inconsistency of transmission and reception channel delays, resulting in misoperation of current differential protection.

Description

technical field [0001] The present application relates to the technical field of relay protection, in particular to a data synchronization method and related devices for current differential protection of AC lines. Background technique [0002] The current differential protection of AC lines is simple in principle, fast in action, high in sensitivity, and has natural phase selection ability, which is not affected by system oscillation. With the development of power system communication network, line current differential protection has gradually become the main protection method of high voltage transmission line main protection. The line current differential protection algorithm requires that the currents on both sides of the comparison must be sampled or processed synchronously, which is the key to realize the current differential protection. If the currents on both sides of the AC line are not synchronized, it will cause the current differential protection to malfunction w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26H02H1/00G01R19/02G01R19/10
CPCG01R19/02G01R19/10H02H1/0007H02H7/26
Inventor 王增超刘玮黄明辉李一泉陈桥平邓旭阳王育学索江镭吴梓亮
Owner POWER DISPATCHING CONTROL CENT OF GUANGDONG POWER GRID CO LTD
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