IEEE PC37.238/D21.3, Jan 2017 is an inactive IEEE approved draft standard profile for using IEEE 1588 Precision Time Protocol in power system applications. It focuses on how precise time synchronization may be applied across electrical and industrial systems where timing accuracy supports coordinated operation, event correlation, and system analysis. For engineers and purchasers working with power, energy, and related components, IEEE PC37.238/D21.3, Jan 2017 provides a technical reference for aligning PTP use with utility-focused requirements.

About IEEE PC37.238/D21.3, Jan 2017

This draft profile is intended to define a consistent way to apply IEEE 1588 Precision Time Protocol within power system environments. In that context, it helps clarify how time distribution and synchronization should be approached for devices and systems that need common timing behavior. Because the document is tied to power system applications, it is especially relevant where coordination between control, monitoring, and measurement equipment affects engineering decisions. IEEE PC37.238/D21.3, Jan 2017 is useful when evaluating implementation alignment and technical requirements.

Where is IEEE PC37.238/D21.3, Jan 2017 used?

The standard is most relevant in power utility and energy infrastructure settings where synchronized time is important for system visibility and operational consistency. Typical use cases may include substations, protection and control equipment, monitoring networks, and other components that depend on accurate timing for data comparison or event sequencing. IEEE PC37.238/D21.3, Jan 2017 also fits engineering workflows involving interoperability checks, time-sensitive communications, and specification review for devices used in power system environments.

Importance in practice

In practice, this profile helps reduce uncertainty when specifying or testing time synchronization for power system applications. A clear reference can support procurement, design control, and verification activities by giving engineers a common basis for IEEE 1588 deployment. That matters when timing accuracy influences event records, coordination between devices, or system performance assessment. Using IEEE PC37.238/D21.3, Jan 2017 may also help improve consistency across projects and lower the risk of mismatched implementation assumptions.

• IEEE 1588 profile for power systems
• Time synchronization guidance
• Utility and substation applications
• Support for control and monitoring equipment
• Draft standard, Jan 2017