采用异步通信的纵联保护通道技术

分析了纵联保护传统的命令式通道现状 ,对采用异步通信的直接数字逻辑通信通道方式进行了研究 ,指出具体实施时应注意的问题。传统通道一般采用专用或复用电力线载波 ,传输时间长 ,可靠性低 ,易受干扰 ,是保护不正确动作的主要原因之一。直接数字逻辑通信采用RS - 2 32C异步通信方式 ,利用专用或复用的数字通道同时传输多位有效信息 ,可以实现多种保护方案的结合 ,具有接口简单、传输时间短、成本低等优点 ,可适应不同的数字通道方式 ,分析和试验表明其安全性及可靠性能满足闭锁式、允许式及远方跳闸纵联保护的要求

The technology of channel for pilot protection using asynchronous communication

This paper represents the analysis of the status of traditional commanding channels, studying of channel mode using direct digital logic communication based asynchronous communication for pilot protection, and the problems about its practice. The special channel or multi-channel using carrier wave by power lines, which has long transmission time and low reliability, and which is disturbed easily, is the one of main reason of incorrect performance of the protection relay. The direct digital logic communication, with RS-232C asynchronous communication mode, can transfer eight bits available information by digital special or multi-channel, and may integrate some protection schemes. It has some advantages, such as simpler interface, larger information transferred, shorter transmission time, lower cost. It may fit for different digital channel modes. The analysis and test shows that its security and reliability can meet the requirement of the pilot protection for blocking scheme, permission scheme and direct trip scheme.