IEEE PC37.238/D21.1, August 2016 is a draft IEEE standard profile for using IEEE 1588 Precision Time Protocol in power system applications. It addresses how precise time synchronization can support communications and coordinated operation across power, energy, and related engineering systems. This matters where distributed devices must share a common time base for monitoring, event correlation, control actions, and performance verification. As a draft, IEEE PC37.238/D21.1, August 2016 reflects an in-progress technical framework for those requirements.

What is IEEE PC37.238/D21.1, August 2016?

This document is a profile-focused draft that narrows IEEE 1588 Precision Time Protocol for use in power system environments. Rather than defining PTP from the ground up, it helps identify how time synchronization requirements should be applied in utility and grid-related systems. IEEE PC37.238/D21.1, August 2016 is relevant where deterministic timing, interoperability, and consistent timestamping are important to engineering practice. It serves as a technical reference for aligning implementations to a common approach.

Where is IEEE PC37.238/D21.1, August 2016 used?

IEEE PC37.238/D21.1, August 2016 is typically used in power system communications and automation settings where precision time is needed across connected equipment. That may include substations, protection and control systems, networked measurement devices, and other time-sensitive infrastructure supporting power delivery. It can also be relevant to communication networks that carry synchronization traffic between devices. In practice, the draft helps engineers and integrators apply IEEE 1588 in environments where timing accuracy affects system behavior and data alignment.

Why is IEEE PC37.238/D21.1, August 2016 important?

This draft is important because precise time synchronization helps reduce ambiguity in recorded events, control coordination, and system analysis. For organizations designing or procuring power automation equipment, IEEE PC37.238/D21.1, August 2016 provides a clearer basis for compatibility and implementation decisions. It can support more consistent testing and verification of devices that depend on shared timing, which in turn helps lower integration risk. In time-critical power applications, that consistency is often essential for dependable operation.

• IEEE 1588 profile for power system use
• Draft standard status
• Time synchronization for utility and grid systems
• Relevant to communications and automation equipment
• English-language technical document