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电网技术  2010 

利用公网2M电路传输差动保护信号的可行性分析

, PP. 210-215

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Abstract:

为验证通过公网传输电流差动保护信号的可行性,首先对公网2M电路的性能特点进行技术分析,得出结论公网2M电路误码率指标满足差动保护信号的传输要求;但传输时延较电力通信网长,备用通道的传输时延与网络结构和故障点位置有关,具有不唯一性;公网2M电路具有自动切换功能,切换瞬间不保证双向时延完全一致,且切换前后时延存在变化,易造成保护信号采样失步和差流计算错误,会给线路保护带来安全隐患;公网2M通道可以和保护装置进行同步配合。后对广州—河池现场2M电路传输差动保护信号进行长时间的测试,结果证明公网2M电路的传输时延不稳定,造成保护装置异常,无法可靠运行,因此差动保护信号不能通过公网2M电路进行传输。

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