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
CN101877676AActive Publication Date: 2010-11-03CHINA ELECTRIC POWER RES INST +1
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
CHINA ELECTRIC POWER RES INST
Publication Date
2010-11-03

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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.
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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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