IEEE PC37.238a/D2, May 2020
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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Language: English
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About This Item
IEEE PC37.238a/D2, May 2020 is an IEEE draft standard profile focused on using IEEE 1588 Precision Time Protocol in power system applications. This amendment adds a Type-Length-Value (TLV) to identify the latest International Earth Rotation Service (IERS)-specified Coordinated Universal Time (UTC) leap second event. It is relevant where precise time transfer and leap-second awareness support synchronization, event correlation, and dependable operation in power and energy systems.
What is IEEE PC37.238a/D2, May 2020?
This technical document defines an amendment to the IEEE 1588 profile used for power system timing. IEEE PC37.238a/D2, May 2020 addresses how a networked device can convey information about the most recent IERS-specified UTC leap second through a TLV. In practice, that helps synchronized equipment interpret time accurately when leap-second adjustments occur. The standard is part of a timing framework intended for power system applications where consistent timestamping and coordinated operation may be important.
Where is IEEE PC37.238a/D2, May 2020 used?
IEEE PC37.238a/D2, May 2020 is typically relevant in power system environments that rely on IEEE 1588-based timing, such as substations, control centers, and other synchronized monitoring or automation systems. It may be used with equipment that exchanges timing information across communication networks, especially where accurate UTC alignment matters for logging, sequence-of-events records, and protection-related coordination. The amendment is most useful in workflows that must recognize leap-second events without disrupting time synchronization behavior.
Why is IEEE PC37.238a/D2, May 2020 important?
This standard matters because precise timekeeping in power applications supports reliable data comparison, system analysis, and operational consistency. IEEE PC37.238a/D2, May 2020 helps reduce ambiguity around UTC leap-second handling, which can otherwise affect timestamps and time-sensitive records. For engineering, procurement, and compliance work, it provides a clearer technical reference for systems that need interoperable behavior during time adjustments. That can lower integration risk and improve confidence in synchronized power network operations.
- IEEE 1588 power system profile amendment
- UTC leap second TLV definition
- Time synchronization for power networks
- Substation and control system timing use
- English-language IEEE draft document
- Publication Date: 2020
- Standard Status: Inactive
- Publisher: IEEE
- Subject: Components, Circuits, Devices and Systems; Power, Energy and Industry Applications
- Official IEEE: Doi link
- New Version Available: PC37.238 (2023)
- Previous Version: PC37.238 (2023)
- Previous Version: PC37.238 (2022)
- This Version: PC37.238 (2020)
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- Previous Version: PC37.238 (2011)
- Previous Version: PC37.238 (2010)
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