Standards and Key Requirements in Secondary Circuit Design
- TonyZhang
- Sep 25
- 2 min read
In global power projects, IEC international standards, GB/T national standards, and DL/T industry standards are the authoritative references for secondary circuit design. These standards define not only the functional logic of protection and control, but also impose strict requirements on electromagnetic compatibility (EMC), reliability, and maintainability.
For substations, power plants, and industrial operators, compliance is not optional—it is the foundation for system stability and project acceptance.
Three Core Requirements
1. Electrical Safety and Functional Completeness
Standards require secondary circuits to provide complete functions, including tripping, closing, blocking, and signaling, with redundancy where necessary. ➡️ ODES solutions are designed and tested to deliver safe and stable secondary circuits aligned with IEC, GB/T, and DL/T requirements.
2. EMC and Environmental Immunity
IEC 60255, GB/T 14598, and DL/T 634 require equipment to pass Level 4 EMC testing, ensuring resilience against interference, lightning surges, and voltage dips. ➡️ All ODES products are type-tested by the China Electric Power Research Institute, with over 25 years of successful field application.
3. Standardization and Maintainability
IEC promotes modular design, while GB/T and DL/T emphasize maintainability and field adaptability. ➡️ ODES secondary circuit products adopt DIN-rail modular packaging, simplifying maintenance and reducing operational complexity.
Application Examples
500 kV Substations: PT switching relays ensure dual-bus transfer in full compliance with IEC and DL/T standards.
International Power Plant Interconnections: Manual synchronizing devices meet IEC requirements for precise voltage, frequency, and phase synchronization.
GIS Integrated Control Cabinets: Climate-control modules maintain environmental conditions within IEC and GB/T thresholds for humidity and temperature stability.
Standards are not a burden—they are the shield that ensures reliable system operation.
All ODES secondary circuit products are designed and validated to the core requirements of IEC, GB/T, and DL/T standards. From auxiliary protection relays to power and communication modules, ODES delivers standardized, modular, and internationally compliant solutions for modern power systems.
📩 For standard-compliant secondary circuit solutions, contact:
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