With the continuous development of power system automation and computer network communication, telecontrol protocols are also changing and developing. According to the IEC60870-5-101 and IEC60870-5-104 telecontrol protocols formulated by the International Electrotechnical Commission, my country has formulated corresponding supporting standards DL/T634-1997 and DL/T634.5104-2002. Among them, IEC-60870-5-104 is the network access of IEC60870-5-101 using the standard transmission protocol subset. This article discusses the necessity of adopting IEC60870-5-101/104, introduces the communication structure of the integrated LCU, and describes in detail the communication implementation process of the protocol in the ecological small hydropower integrated LCU, explaining that the two international standards IEC60870-5-101/104 are solutions that can meet the transmission of various data types and ensure communication reliability, which brings great convenience to the processing of communication data.
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