PLC解除闭锁信号的特点及应用  

Features and Applications of Unblocking Teleprotection Signal of PLC

作　　者：王如兴 李永红 

机构地区：[1]上海ABB工程有限公司,上海201319

出　　处：《电力系统通信》2011年第4期62-70,共9页Telecommunications for Electric Power System

摘　　要：当远方保护的允许信号通过电力线载波通道传输时,如遇通道中断,收信侧可能因未收到该允许信号而造成保护拒动。在这种情况下,解除闭锁信号可以代替允许信号,防止上述情况的发生。文章简述远方保护信号在电力线载波通道中的传输原理,从电力线载波通信的视角深入分析解除闭锁信号的产生原因、特点及对远方保护命令传输的影响。通过工厂试验和现场运行实例,验证了通道中断和通道噪声干扰是产生解除闭锁信号的两大主因。在实际使用中,应正确设置解除闭锁信号的时间参数,合理分配各信号的发信功率,优化通道特性等。While the teleprotection permissive signal transmitted in power line carrier（PLC） channel,it might be lost in receive side,thus causes relay protection can＇t trip the line breakers if the channel is interrupted.Under this condition,the unblocking signal can replace the permissive signal to avoid above mentioned situation.This article introduces the principle of teleprotection signal transmitted in PLC channel,analyses the reasons and the features of the unblocking signal,and its affections to the transmission of teleprotection command.From factory test and site operation,it is verified that the two main causes of unblocking signal are channel interrupt and noise disturbance.Therefore,the correct setting of time parameter and transmission power,and optimize the channel performances should be considered in the practical application.

关 键 词：电力线载波 远方保护 解除闭锁信号 跳频信号 监频信号 

分 类 号：TN913.6[电子电信—通信与信息系统]