Time synchronization is now critical to the smart grid, with substations using legacy systems and new standards for network time synchronization, a guide is needed to ensure adequate system design is undertaken to support the applications relying on accurate and reliable time.This guide practice covers the design, installation and monitoring of time synchronization systems in power utility substations. This includes time sources such as Global Positioning Satellite (GPS) and time distribution systems such as Inter-Range Instrumentation Group -B (IRIG-B), Network Time Protocol /Simple Network Time Protocol SNTP (NTP/SNTP), and Standard Profile for Use of IEEE Std. 1588 Precision Time Protocol in Power System Applications - IEEE STD C37.238 (tm). This practice assumes that the time source and the Intelligent Electronic Device (IED) have accurate clocks.
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