Line protection and travelling wave fault location integrated device and travelling wave information inter-station communication method thereof

Abstract

The invention discloses a line protection and travelling wave fault location integrated device and a travelling wave information inter-station communication method thereof. The method is to enable a protected DSP module and a travelling wave DSP module to realize information interaction with an opposite end through an inter-station communication channel based on an existing inter-station communication module and an existing inter-station communication channel of a power transmission line protection device. A travelling wave communication module transmits travelling wave information by utilizing a standby field of a protected communication data frame. Complete travelling wave information is divided into multiple frames based on the length of the standby field for transmission; a travelling wave communication reception module can splice multi-frame content into complete travelling wave information based on the frame sequential number and the total frame number in the frame head of the travelling wave frame. By adoption of the method, although the protected communication and the travelling wave communication share a communication link, the travelling wave communication does not affect the bandwidth and reliability of the protected communication. After the method is adopted, extra configuration of a dedicated channel or network or network communication channel is unnecessary for a travelling wave fault location function, the communication cost and the maintenance management cost can be reduced, and simplification of the engineering debugging is facilitated.

Description

technical field [0001] The invention relates to power grid protection and automation technology, in particular to a line protection traveling wave distance measuring integrated device and a traveling wave information inter-station communication method. Background technique [0002] Currently widely used transmission line protection devices use the impedance method for fault location. This method is easily affected by the system operation mode, transition resistance, attenuated DC component and measurement error, and it is difficult to achieve accurate fault location. An effective way to improve the accuracy of line fault location is to add traveling wave ranging function to the transmission line protection device to form an integrated device for line protection traveling wave ranging, so that the monitored line can realize double-terminal traveling wave ranging and Single-ended traveling wave ranging function. Compared with single-terminal traveling wave ranging, double-ter...

AI Technical Summary

Problems solved by technology

Although it is possible to allocate a dedicated channel for the traveling wave ranging function, or configure an inter-station network communication channel, it will increase the communication cost and maintenance management cost, and increase the complexity of engineering debugging

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