IEEE PC37.2/D0.7, May 2021 is a draft IEEE standard focused on electrical power system device function numbers, acronyms, and contact designations. It is intended to support clear communication in protection, control, and related power engineering work by standardizing the terms used to identify devices and their contacts. For engineers, specifiers, and reviewers, this document can help reduce ambiguity in drawings, schematics, and operating documentation across components, circuits, devices, and systems.

IEEE PC37.2/D0.7, May 2021 overview

This technical document addresses the naming and identification practices commonly used in electrical power system applications. By defining device function numbers and associated acronyms, IEEE PC37.2/D0.7, May 2021 supports more consistent interpretation of protective relaying, control schemes, and equipment records. The draft format indicates it is part of an evolving standards process, so it is most useful when tracking current terminology and alignment for engineering reference, internal documentation, or standards-based review.

Typical use cases

Use this standard when preparing or checking substation drawings, relay panels, control schematics, and device lists that rely on power system function numbers and contact designations. It is also relevant for protection and control engineering, maintenance documentation, equipment labeling, and procurement specifications where clear device identification matters. In utility, industrial power, and energy applications, IEEE PC37.2/D0.7, May 2021 can help teams use consistent acronyms and contact references across project documents.

Why this standard matters

Consistent device numbering and terminology are important for design control, commissioning, and operational safety in power system work. IEEE PC37.2/D0.7, May 2021 helps reduce misunderstandings when engineers, technicians, and vendors refer to the same function or contact in different documents. That consistency can improve compliance reviews, troubleshooting, and testing efficiency while lowering the risk of wiring or logic errors in protection and control systems. It is especially useful where clear documentation supports dependable system operation.

• Device function numbers
• Acronyms for power system equipment
• Contact designation conventions
• Protection and control documentation
• Draft IEEE terminology alignment