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A new mode of process network Architecture for intelligent substation protection is considered in this paper, network based on HSR (High-availability Seamless Redundancy). HSR is required for all he devices inside a bay. And devices in a bay are all in a HSR loop network. Information is shared by HSR switch between bays. To the problem of the data synchronization in different space for relay protection in intelligent substation, a method of data delay measurement based on HSR for intelligent substation is proposed. The SV message is compensated by certain delay to get rid of the dependence on the clock. Finally, the technical advantages and future adaptability of the process network scheme based on HSR are analyzed which adapts to the multiplex communication requirement in intelligent substation. Introduction Secondary equipment such as relay protection in intelligent substation, using process level SV (Sample Value sample value) and GOOSE (Generic Object Oriented Substation Event for general object object) communication in accordance with IEC 61850 instead of traditional analog and I/O signal. Process level communication becomes one of the most important links of the secondary system. In order to avoid the impact of network failure on system communication security, network redundancy design is very necessary [2] [3] . For 220kV and above voltage level equipment, double sets of protection, each set of protection is in a single network mode in process level communication, and 110kV voltage level is with a single set of protection with dual network mode in process level communication. The relatively conservative star Ethernet structure is generally used in Chinese intelligent substation. Redundancy is mainly achieved through equipment duplication or network duplication, resulting in problems such as multiple network equipment in smart substation and complicated debugging. Network redundancy means an increase in equipment or the increase of the network at the cost. While the current SV network mode is highly dependent on time synchronization, it causes potential harm to reliability and interoperability. Some institutions and equipment manufacturers in China have begun to study high-reliability communication technology solutions and related products for intelligent substations, and apply them to process level communication. This paper focuses on HSR-based process level network communication and network architecture to achieve seamless data switching, greatly improving the operational reliability of SV communication network. At the same time the problem of high cost of substation construction is solved for reducing he large number of switches. Solve the data interaction of the protection device within the bay and across the bays in the intelligent substation. HSR Technology HSR technology is mentioned in the IEC62439 "High availability automation networks" standard system published by the IEC committee SC65 WG15 in 2012. Based on the future development trend of intelligent substation, IEC61850 supplements the HSR network redundancy mode in the second

HSR-based Intelligent Substation Process Level Communication Network