The existing problem is analyzed when the single circuit line protection is used in the double-circuit lines on the same tower. This paper suggests two kinds of novel protective relaying schemes for the double-circuit lines on the same tower under the condition of digital substation. One scheme is to send the current sampling value of the single circuit transmission line to the protective relaying of other single circuit transmission line, and the other scheme is to take the double-circuit lines as a complete unit to a-chieve the relaying function in centralized protection or the double-circuit lines protective relaying. Also, this paper advances the structure of two schemes and protection configuration and discusses the sampling value transmission and generic object oriented substation event ( GOOSE) information of the proposed schemes. Finally, this paper reviews the research work on the implementation of new schemes.%分析了单回线保护应用于同杆并架平行双回线路时存在的问题,提出了数字化变电站条件下同杆并架平行双回线路的两种保护方案.一种是将另一回线的电流量引入到本回线保护装置中,第二种是在集中式保护或平行双回线路保护中将双回线作为一个整体实现保护功能.给出了两种方案的构成及保护功能配置,讨论了两种方案的采样值传输和通用面向对象变电站事件(GOOSE)传输实现.展望了实施新方案需要开展的研究工作.
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