IEEE PC37.238a/D3.06, Feb 2023
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/D3.06, Feb 2023 is a draft IEEE standard profile for using IEEE 1588 Precision Time Protocol in power system applications, with an amendment focused on adding a Type-Length-Value field to indicate the latest International Earth Rotation Service-specified UTC leap second event. It is relevant to synchronization schemes where accurate time alignment affects control, monitoring, and event correlation in power and energy systems. As a draft technical document, it helps define a more consistent approach to handling leap-second information in time-sensitive infrastructure.
About IEEE PC37.238a/D3.06, Feb 2023
This draft standard profile builds on IEEE 1588 Precision Time Protocol by addressing a specific timing detail important to utility and power automation environments: how devices indicate the most recent UTC leap second event specified by IERS. In systems that depend on synchronized clocks, even small timing ambiguities can affect record accuracy and operational coordination. IEEE PC37.238a/D3.06, Feb 2023 supports a clearer profile for time distribution, helping implementers align device behavior with a power-system-oriented interpretation of PTP.
Where is IEEE PC37.238a/D3.06, Feb 2023 used?
This profile is most relevant in power system applications that use IEEE 1588 for network-based time synchronization, such as substation automation, protection and control, synchrophasor support, and operational event logging. It may also apply to communication equipment, time servers, and field devices that must interpret UTC leap seconds consistently across a utility network. IEEE PC37.238a/D3.06, Feb 2023 is especially useful where precise timestamping and coordinated actions are important for analysis, automation, and troubleshooting.
Importance in practice
In practice, this standard matters because leap-second handling can influence the consistency of timestamps and the reliability of synchronized operations. A defined TLV for the latest UTC leap second event can reduce interpretation differences between devices, supporting better compliance, testing, and configuration control. For power and energy applications, that can mean fewer timing-related errors in logs, improved interoperability during procurement and integration, and more dependable performance when multiple devices depend on the same time reference.
- IEEE 1588 time synchronization profile
- UTC leap second indication via TLV
- Power system and utility applications
- Draft amendment for timing interoperability
- Publication Date: 2023
- Standard Status: Inactive
- Publisher: IEEE
- Subject: Power, Energy and Industry Applications
- Official IEEE: Doi link
- This Version: PC37.238 (2023)
- Previous Version: PC37.238 (2023)
- Previous Version: PC37.238 (2022)
- Previous Version: PC37.238 (2020)
- Previous Version: PC37.238 (2017)
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- 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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