IEEE PC37.108/D2.23, Jul 2020 is an approved draft guide focused on the protection of secondary network systems, where coordinated power-system protection is essential for reliable service. It addresses the technical considerations involved in protecting networked secondary distribution arrangements and helps engineers evaluate schemes, equipment, and operating behavior in power, energy, and industrial applications. This standard is relevant when consistency, system coordination, and protection performance must be assessed in complex secondary network environments.

IEEE PC37.108/D2.23, Jul 2020 overview

This technical document provides guidance for the protection of secondary network systems, with attention to the protection challenges that arise in interconnected distribution networks. IEEE PC37.108/D2.23, Jul 2020 is useful for understanding how protective functions may be applied in systems where multiple sources, networked conductors, and coordinated devices affect fault response. As an inactive draft, it is best used as a reference for the intended protection concepts, design considerations, and engineering terminology associated with secondary network protection.

Typical use cases

This guide is commonly relevant for engineers working on secondary network protection studies, system coordination reviews, and equipment specification for networked distribution systems. It may support planning for network relays, protective devices, fault isolation methods, and operating practices in utility or large facility power systems. IEEE PC37.108/D2.23, Jul 2020 can also be useful during design review, troubleshooting, or procurement when the behavior of secondary network protection must be understood before implementation.

Why this standard matters

Secondary network systems can be difficult to protect consistently because normal operation and fault conditions may involve interconnected sources and multiple pathways. IEEE PC37.108/D2.23, Jul 2020 helps provide a shared technical basis for evaluating protection approaches, which can improve design control, coordination, and safety-related decision-making. Using a defined guide also supports clearer comparison of equipment options, more predictable performance, and lower risk of misapplication in power and energy installations.

• Secondary network protection guidance
• Fault coordination considerations
• Distribution system engineering reference
• Protection device and scheme planning
• Power network performance evaluation