Use of IEEE 1588–2008 for a sampled value process bus in transmission substations

Title

Use of IEEE 1588–2008 for a sampled value process bus in transmission substations

Subject

IEC 61850

IEC standards

IEEE 1588

performance evaluation

protective relaying

Synchronization

Clocks

smart grids

Global Positioning System

Substations

time measurement

power transmission

Jitter

power system simulation

ethernet networks

Oscillators

Creator

David M. E. Ingram

Duncan A. Campbell

Pascal Schaub

Source

2011 IEEE International Instrumentation and Measurement Technology Conference, pp. 1-6

Publisher

IEEE

Date

2011-05-10

Relation

ISBN 1091-5281

Format

application/pdf

Language

en

Type

Peer-reviewed Article

info:eu-repo/semantics/conferencePaper

info:eu-repo/semantics/acceptedVersion

Identifier

10.1109/IMTC.2011.5944081

Coverage

Hangzhou, China

Abstract

IEC Technical Committee 57 (TC57) published a series of standards and technical reports for “Communication networks and systems for power utility automation” as the IEC 61850 series. Sampled value (SV) process buses allow for the removal of potentially lethal voltages and damaging currents inside substation control rooms and marshalling kiosks, reduce the amount of cabling required in substations, and facilitate the adoption of non-conventional instrument transformers. IEC 61850-9-2 provides an inter-operable solution to support multi-vendor process bus solutions. A time synchronisation system is required for a SV process bus, however the details are not defined in IEC 61850-9-2. IEEE Std 1588-2008, Precision Time Protocol version 2 (PTPv2), provides the greatest accuracy of network based time transfer systems, with timing errors of less than 100 ns achievable. PTPv2 is proposed by the IEC Smart Grid Strategy Group to synchronise IEC 61850 based substation automation systems. IEC 61850-9-2, PTPv2 and Ethernet are three complementary protocols that together define the future of sampled value digital process connections in substations. The suitability of PTPv2 for use with SV is evaluated, with preliminary results indicating that steady state performance is acceptable (jitter <

300 ns), and that extremely stable grandmaster oscillators are required to ensure SV timing requirements are met when recovering from loss of external synchronisation (such as GPS).