IEEE PC37.238a/D3.0, Oct 2022
IEEE Draft Standard Profile for Use of IEEE 1588 Precision Time Protocol in Power System Applications Amendment 1: Adding a Type-Length-Value (TLV) to indicate the latest International Earth Rotation Service (IERS)-specified Universal Time Coordinated (UTC) Leap Second Event
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About This Item
IEEE PC37.238a/D3.0, Oct 2022 is a draft IEEE standard profile for applying IEEE 1588 Precision Time Protocol in power system applications, with Amendment 1 focused on adding a Type-Length-Value (TLV) that identifies the latest International Earth Rotation Service-specified Universal Time Coordinated (UTC) leap second event. It is relevant to power, energy, and industry applications where accurate time synchronization supports coordinated operation, event correlation, and reliable system behavior across time-sensitive equipment and communication networks.
Overview of IEEE PC37.238a/D3.0, Oct 2022
This draft profile builds on IEEE 1588 PTP by defining a power-system-oriented approach to time synchronization and by addressing how devices can communicate leap second information in a structured way. IEEE PC37.238a/D3.0, Oct 2022 is intended for environments where common time references matter for monitoring, control, and sequence-of-events recording. The added TLV helps systems recognize the most recent UTC leap second event more consistently, supporting interoperability among compliant devices and implementations.
Typical use cases
IEEE PC37.238a/D3.0, Oct 2022 is typically used in substations, utility automation, and other time-sensitive power system networks that rely on IEEE 1588 for synchronization. It may also apply to protection relays, merging units, controllers, and measurement systems that need a shared UTC-based time source. In these settings, the amendment’s leap second signaling can help maintain alignment in logs, disturbance records, and coordinated control workflows where precise time interpretation is important.
Why it matters
This draft standard matters because time errors can affect event analysis, interoperability, and operational confidence in power system environments. By clarifying how the latest UTC leap second event is conveyed, IEEE PC37.238a/D3.0, Oct 2022 can reduce ambiguity in synchronized systems and support more consistent implementation across vendors. For procurement, design review, and compliance planning, it offers a focused technical reference for time distribution behavior in IEEE 1588-based power applications.
- IEEE 1588 profile for power system timing
- Leap second TLV for UTC event indication
- Time synchronization for utility and industrial networks
- Sequence-of-events and disturbance record alignment
- Draft amendment within the PC37.238 series
- Publication Date: 2022
- Standard Status: Inactive
- Publisher: IEEE
- Subject: Power, Energy and Industry Applications
- Official IEEE: Doi link
- New Version Available: PC37.238 (2023)
- Previous Version: PC37.238 (2023)
- This Version: PC37.238 (2022)
- Previous Version: PC37.238 (2020)
- Previous Version: PC37.238 (2017)
- Previous Version: PC37.238 (2017)
- Previous Version: PC37.238 (2016)
- Previous Version: PC37.238 (2016)
- Previous Version: PC37.238 (2015)
- Previous Version: PC37.238 (2014)
- Previous Version: PC37.238 (2011)
- Previous Version: PC37.238 (2011)
- Previous Version: PC37.238 (2011)
- Previous Version: PC37.238 (2010)
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