Method for judging change of differential protection route according to change of unidirectional transmission delay

A time-delay change and one-way transmission technology, applied in the field of power systems, can solve problems such as defects in protection synchronization principles, lack of judgment methods and adjustment measures for channel routing changes, and achieve wide application effects

Active Publication Date: 2010-11-03
CHINA ELECTRIC POWER RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] (2) Synchronization principle and defects of line longitudinal differential protection
[0017] At present, line longitudinal differential protection is widely used, but there is a lack of judgment methods and adjustment measures for channel routing changes

Method used

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  • Method for judging change of differential protection route according to change of unidirectional transmission delay
  • Method for judging change of differential protection route according to change of unidirectional transmission delay
  • Method for judging change of differential protection route according to change of unidirectional transmission delay

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Embodiment Construction

[0039] The line delay calculation of the host sending and receiving from the slave is as follows: Figure 4 As shown in , the calculation steps for the one-way transmission delay change of the host sending and receiving from the slave are as follows:

[0040] (1) First configure bidirectional routing consistency, and follow the figure 2 The channel delay test method tests the sum of two-way delay. Since the bidirectional routes are consistent, the one-way delay is half of the sum of the two-way delays. Take this as the initial condition of the invention.

[0041] (2) The master sends a message with a time stamp (Tmt1) to the slave, and Tmt1 is based on the master time.

[0042] (3) The slave records the time Tsr1 of receiving the message containing Tmt1, and Tsr1 is based on the time of the slave.

[0043] (4) Calculate and save ΔTms1=Tsr1-Tmt1.

[0044](5) The master sends a message with time Tmt2 to the slave at the next message sending time, and Tmt1 is based on the m...

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Abstract

The invention relates to a method for judging change of a differential protection route according to change of unidirectional transmission delay. The time delay of protective devices at the two ends of a circuit is calculated to obtain unidirectional time delay so as to judge the change of a transceiving route; and a triggering device performs resampling and synchronization adjustment. Through the method, the change of a bidirectional route is judged by only partially modifying software without adding hardware equipment, so that the harsh requirement of a differential protective device on the consistency of bidirectional time delay is met and differential protection has wider application.

Description

technical field [0001] The invention belongs to the field of electric power systems, and in particular relates to a method for judging bidirectional route changes according to changes in transmission time delay for line longitudinal differential protection based on a data channel synchronization method. Background technique [0002] (1) Test method for one-way transmission delay [0003] The one-way transmission delay of the on-site communication circuit adopts the loopback test, that is, the signal is looped back to the near end at the far end of the test, the signal sent by the instrument is looped back through the circuit, and the two-way delay is obtained according to the sending and receiving clock of the instrument. The test result Half of is the one-way delay. [0004] Theoretically, an accurate clock source can be configured at both ends of the field circuit. The two clock sources are required to be completely synchronized. One end sends a message with a time tag to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/56H04L7/00H04L45/28
Inventor 丁慧霞刘革滕玲张颖卢锟伍小波
Owner CHINA ELECTRIC POWER RES INST
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