DL/T 317-2025 is the current national standard in China for relay protection design, emphasizing dualized configurations, intelligent substations, and standardized protection device modeling.OverviewT...
The DL/T 317-2025 "Standardized Design Specification for Relay Protection Equipment" was issued by the National Energy Administration on June 30, 2025, replacing the 2010 edition. It establishes technical principles and design criteria for relay protection devices and circuits in power grids of 220 kV and above, covering lines, transformers, high-voltage shunt reactors, busbars, and bus-coupler sections . The standard reflects the trend toward digital and intelligent substations, incorporating merging units, intelligent terminals, SV sampling, and GOOSE communication.
1. Dualized Configuration The standard emphasizes complete independence of dual protection sets, including CT/PT secondary windings, DC power sources, tripping coils, and communication channels. This ensures that a single fault does not compromise protection, enhancing grid N-2 reliability. For example, line pilot protection uses dual fiber optic channels with independent power sources and interface equipment . 2. Intelligent Station Device Modeling DL/T 317-2025 specifies modeling requirements for intelligent devices:
DL/T 317-2025 aligns with practical testing procedures for switchgear, instrument transformers, and relays, ensuring that close, trip, indication, and alarm circuits function correctly. Dualized configurations allow maintenance on one set of protection without affecting the other .
While DL/T 317-2025 is a national standard, it complements IEC 60255-1:2022, which specifies common rules for measuring relays and protection equipment, and IEEE Std C37.90-2005, which defines service conditions, electrical ratings, and testing requirements for relays and relay systems . This ensures interoperability and adherence to global best practices.
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