This standard is proposed by ChinaElectricity Council (CEC).This standard is under jurisdiction ofStandardization Technology Committee ofProtection of Power Industry and this committee is in charge of explanationof this standard.This standard is drafted by East China Electric PowerDispatching & Communication Center, National Electric Power Dispatching& Communication Center, Zhejiang Electric Power Dispatching &Communication Center, Fujian Electric Power Dispatching & CommunicationCenter, Jiangsu Electric Power Dispatching & Communication Center, AnhuiElectric Power Dispatching & Communication Center, Shanghai Electric PowerDispatching & Communication Center, and Electric Power Dispatching &Communication Center of China Southern Power Grid.Chief draftersof this standard: Chen Jianmin, Han Xuejun, Hu Hong, Ni Laqin, Cheng Xiao, YaoZhonghuan, Huang Wei, Yan Guoping, Sun Yueqin, Huang Jingyi, Zhang Yong.This guide ismainly translated by China Electric Power Research Institute.The main translatorsof this guide are Wang Xiaoyang, YangGuosheng, Wang Zhijie, Liu Yadong, Zhou Zexin, Yao Tao, Qin Zening.