GE Grid Solutions Reason RT431 GPS Precision-Time Clock
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Author:kongjiang
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Published time: 2025-10-30
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RT431 GPS precise time clock is a time synchronization device specially designed to meet the application requirements of key substations. With the expansion of advanced applications such as phasor measurement, merging unit, traveling wave fault location and current differential protection in synchronous optical network (SONET) and MPLS systems, the demand for 24/7 all-weather accurate time synchronization is increasing. In order to obtain the best precision and granularity, it is very important to use a common precise time reference. RT431 is a compact clock based on GPS, which can be installed on DIN rail, and supports direct current shift bit time signal, serial datagram, network time protocol (NTP), simple network time protocol (SNTP) and IEEE 1588v2 precision time protocol (PTP). As an ordinary clock (slave clock) of PTP, RT431 can also act as a transceiver for PTP to IRIG-B, serial or pulse time codes, so that old intelligent electronic devices (IEDs) that do not support PTP can use PTP. RT431 follows the latest standards and provides the latest IEEE 1588v2 extension protocols suitable for power system protection, control automation and data communication applications, including IEEE C37.238:2017, IEC/IEEE 61850-9-3:2016 and IEEE C37.238:2011. These protocols have been preconfigured, which simplifies the setup of IEEE 1588v2 network.
Reason RT431
GPS Precision-Time Clock
The demand for accurate time synchronization available 24/7 increases with the growth of
critical substation applications, such as phasor measurement, merging units, travelingwave
fault location and current differential protection operating over Synchronous Optical
Networking (SONET) and Multi-Protocol Label Switching (MPLS) systems. In order to yield
the best accuracy and granularity from such applications, the use of a common, precision
time reference is essential.
Time Synchronization
The RT431 Time Code Generator is a compact GPS-based clock designed to be installed on
a DIN-rail that supports electrical DC Level Shift time signals, serial datagrams, Network
Time Protocol (NTP) / Simple Network Time Protocol (SNTP) and the IEEE 1588v2 Precision
Time Protocol (PTP). When configured as PTP ordinary clock (slave), RT431 also works as a
transceiver from PTP to IRIG-B, serial or pulse time codes, enabling the use of PTP on legacy
IEDs that do not support this protocol.
PTP Power Profiles
Following the latest standards, RT431 offers the most recent IEEE 1588v2 extended profiles for power system protection, control automation, and data
communication applications, such as: IEEE C37.238:2017, IEC/IEEE 61850-9-3:2016 and IEEE C37.238:2011. All these are pre-configured on the RT431,
making it easier to configure an IEEE 1588v2 network. The following table presents a comparison between the main characteristics of each profile.
