IEEE PC37.98/D5.1D Jul 2013 is a draft IEEE standard focused on seismic qualification testing for protective relays and auxiliary equipment used in nuclear facilities. It addresses how this protection and control hardware may be evaluated for earthquake-related service conditions, helping engineers and buyers understand performance expectations before installation. For power, energy, and industrial applications where nuclear safety systems depend on dependable relaying, this technical document supports more consistent qualification, design review, and procurement decisions.

About IEEE PC37.98/D5.1D Jul 2013

This draft standard provides a technical framework for seismic qualification testing of protective relays and auxiliaries in nuclear facility applications. It is relevant to equipment that must continue to function, or be shown to remain acceptable, under seismic loading conditions. IEEE PC37.98/D5.1D Jul 2013 is therefore useful when defining test methods, qualification evidence, and acceptance expectations for relay-based protection and control systems. As an inactive draft, it is best viewed as a dated reference for engineering and compliance work.

Where is IEEE PC37.98/D5.1D Jul 2013 used?

The standard is most relevant in nuclear plant protection and control environments where protective relays, trip logic, and related auxiliaries must be qualified for earthquake conditions. It may be used by electrical engineers, qualification laboratories, and procurement teams working with switchgear interfaces, relay panels, and safety-related control equipment. Because the subject area includes power and energy applications as well as components and systems, the document is especially useful in workflows tied to seismic analysis, testing plans, and equipment certification.

Importance in practice

In practice, IEEE PC37.98/D5.1D Jul 2013 helps reduce uncertainty when evaluating whether relay and auxiliary equipment can meet seismic performance expectations in nuclear service. It supports more consistent test planning, documentation, and design control, which can be important for safety-related systems and procurement specifications. Using a defined draft standard can also improve reviewability across vendors and test facilities, helping stakeholders compare qualification evidence and manage risk in critical power system applications.

• Seismic qualification of protective relays
• Auxiliary equipment for nuclear facilities
• Testing and acceptance evidence
• Safety-related power system applications
• Draft, inactive IEEE reference document