The study of synchronization accuracy of ENMU devices according to the PTPv2 protocol in laboratory conditions

Introduction. One of the directions of digital transformation of the electric power industry is the introduction of intelligent electronic devices (IED) with the function of synchronized measurements. For high-precision and reliable synchronization of the IED, the PTPv2 protocol is used in combination with fiber-optic communication lines (FOCL) and programmable switches supporting them. There is experience of such synchronization at distances up to 2 km in substation projects with a high level of automation. However, there is no experience of practical testing of such a solution in distribution networks at distances of more than 2 km based on ENMU devices of Energoservice LLC.

Goal. The aim is to study the accuracy of synchronization of ENMU devices using the PTPv2 protocol of the IEEE 1588 standard using a timeserver, telecommunication switches and media converters and an 8 km fiber-optic communication line in laboratory conditions.

Materials and methods. The study was performed in laboratory conditions using a time correction unit, an industrial switchboard and a media converter, a bay with an 8 km long OKP-K-8 fiber-optic cable, a reference signal generator and a backup measuring system based on National Instruments measuring devices implementing the PMU functionality.

Results and discussion. The results of laboratory tests showed that the synchronization accuracy ranged from 0.5 to 16 µs, depending on the method used to calculate the desynchronization.

Conclusion. Laboratory tests have shown the possibility of synchronizing measurements with high accuracy using ENMU devices based on the IEEE 1588 PTP v2 protocol at a distance of at least 8 km. The results obtained prove the prospects for the introduction of such devices not only in power supply centers, but also within the entire feeder of the distribution network or its individual parts.

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