1、BSI Standards PublicationCommunication networks and systems for power utilityautomationPart 9-3: Precision time protocol profile for power utility automationPD IEC/PAS 61850-9-3:2015National forewordThis Published Document is the UK implementation of IEC/PAS 61850-9-3:2015. The UK participation in i
2、ts preparation was entrusted to TechnicalCommittee PEL/57, Power systems management and associated information exchange.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisions ofa contr
3、act. Users are responsible for its correct application. The British Standards Institution 2015.Published by BSI Standards Limited 2015ISBN 978 0 580 89971 3ICS 33.200 Compliance with a British Standard cannot confer immunity fromlegal obligations.This Published Document was published under the autho
4、rity of theStandards Policy and Strategy Committee on 31 August 2015. Amendments/corrigenda issued since publicationDate Text affectedPUBLISHED DOCUMENTPD IEC/PAS 61850-9-3:2015IEC PAS 61850-9-3 Edition 1.0 2015-06 PUBLICLY AVAILABLE SPECIFICATION PRE-STANDARD Communication networks and systems for
5、power utility automation Part 9-3: Precision time protocol profile for power utility automation INTERNATIONAL ELECTROTECHNICAL COMMISSION ICS 33.200 ISBN 978-2-8322-2725-1 Registered trademark of the International Electrotechnical Commission Warning! Make sure that you obtained this publication from
6、 an authorized distributor. PD IEC/PAS 61850-9-3:2015 2 IEC PAS 61850-9-3:2015 IEC 2015 CONTENTS FOREWORD . 3 INTRODUCTION . 5 1 Scope 6 2 Normative references. 6 3 Terms, definitions, abbreviations and acronyms . 6 3.1 Terms and definitions 6 3.2 Abbreviations and acronyms 7 4 Identification 7 5 Cl
7、ock types . 7 6 Protocol specifications . 8 7 Requirements 8 7.1 Measurement conditions 8 7.2 Network time inaccuracy . 9 7.3 Network elements . 9 7.4 Requirements for grandmasters . 9 7.4.1 Grandmaster time inaccuracy . 9 7.4.2 Grandmaster holdover 9 7.4.3 Grandmaster clockClass in holdover and rec
8、overy 9 7.5 Requirements for TCs . 9 7.6 Requirements for BCs . 10 7.6.1 BC time inaccuracy 10 7.6.2 BC as free-running grandmaster . 10 7.6.3 BC as master in holdover . 10 7.7 Requirements for media converters . 10 7.8 Requirements for links . 10 7.9 Network engineering . 10 8 Default settings . 11
9、 9 Redundant clock handling 12 10 Protocol Implementation Conformance Statement (PICS) . 12 10.1 Conventions 12 10.2 PICS . 12 Table 1 PTP attributes for the Power Utility Automation profile 11 Table 2 PICS for clocks 12 PD IEC/PAS 61850-9-3:2015IEC PAS 61850-9-3:2015 IEC 2015 3 INTERNATIONAL ELECTR
10、OTECHNICAL COMMISSION _ COMMUNICATION NETWORKS AND SYSTEMS FOR POWER UTILITY AUTOMATION Part 9-3: Precision time protocol profile for power utility automation FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national elect
11、rotechnical committees (IEC National Committees). The object of IEC is to promote international co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and in addition to other activities, IEC publishes International Standards, Technical Specific
12、ations, Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with may participate in this preparatory work. Internation
13、al, governmental and non-governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for Standardization (ISO) in accordance with conditions determined by agreement between the two organizations. 2) The formal de
14、cisions or agreements of IEC on technical matters express, as nearly as possible, an international consensus of opinion on the relevant subjects since each technical committee has representation from all interested IEC National Committees. 3) IEC Publications have the form of recommendations for int
15、ernational use and are accepted by IEC National Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any misinterpretation by any end user. 4) In
16、order to promote international uniformity, IEC National Committees undertake to apply IEC Publications transparently to the maximum extent possible in their national and regional publications. Any divergence between any IEC Publication and the corresponding national or regional publication shall be
17、clearly indicated in the latter. 5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any services carried out by independent certificati
18、on bodies. 6) All users should ensure that they have the latest edition of this publication. 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and members of its technical committees and IEC National Committees for any personal injury, p
19、roperty damage or other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications. 8) Attention is drawn to the Normative references cited
20、in this publication. Use of the referenced publications is indispensable for the correct application of this publication. 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent rights. IEC shall not be held responsible for identifying
21、any or all such patent rights. A PAS is a technical specification not fulfilling the requirements for a standard, but made available to the public. PD IEC/PAS 61850-9-3:2015 4 IEC PAS 61850-9-3:2015 IEC 2015 IEC PAS 61850-9-3 has been developed by IEC technical committee 57: Power systems management
22、 and associated information exchange, in cooperation with the IEEE Power Systems Relaying Committee Working Group H24/Substation Committee Working Group C7 of the Power the port (or the port pair in redundancy) can be in the MASTER state PD IEC/PAS 61850-9-3:2015 8 IEC PAS 61850-9-3:2015 IEC 2015 Gr
23、andmaster-only (defaultDS.slaveOnly = False and clockClass = 6 or 7) no port can be in the SLAVE state. Transparent Clocks (TCs) correct and forward PTP messages; their ports do not have states in IEC 61588:2009. Boundary Clocks (BC) are never slave-only and can have either: exactly one port in the
24、SLAVE state and all other in the MASTER state; all ports in the MASTER state, in which case the BC is the grandmaster. NOTE Within a time domain, a BC has a port in the SLAVE state in the upper sub-domain and one or several ports in the MASTER state in the lower sub-domain(s); see IEC 61850-90-4. At
25、omic clocks are not considered in this specification. 6 Protocol specifications All clocks shall transmit PTP messages on Ethernet layer 2 according to IEC 61588:2009, Annex F. All clocks shall use multicast communication using the addresses specified in IEC 61588:2009, F.1. All clocks shall support
26、 the peer-to-peer delay measurement defined in IEC 61588:2009, 10.3 and 11.4. All clocks shall support the PTP time scale (based on TAI). All singly attached clocks shall support the default best master clock algorithm in IEC 61588:2009, 9.3.2, 9.3.3 and 9.3.4. All doubly attached clocks according t
27、o IEC 62439-3 shall support in addition the extension to the best master clock algorithm defined in IEC 62439,3:2015, Annex A. All clocks shall support both 1-step and 2-step synchronization on ingress; they may use 1-step or 2-step synchronization on egress. All clocks shall support at least one of
28、 the three management mechanisms: 1) The alternate management mechanism using the SNMP MIB specified in IEC 62439-3:2015, Annex E and/or 2) The alternate management mechanism using the management objects defined in IEC 61850-90-4:2013, 19.3 and 19.4 and/or 3) The manufacturer-defined fixed values an
29、d/or the manufacturer-specific implementation means to address all configurable values as stated in IEC 61588:2009, 15.1.1. 7 Requirements 7.1 Measurement conditions Steady state is defined as 30 s after a single master starts to send synchronisation messages and 16 s after a change of master, with
30、no change to the environment temperature. This requirement applies only to clocks that have been energized for 30 minutes to accommodate for instance temperature-controlled oscillators. PD IEC/PAS 61850-9-3:2015IEC PAS 61850-9-3:2015 IEC 2015 9 7.2 Network time inaccuracy The following requirements
31、on the network elements aim at achieving a network time inaccuracy better than 1 s after crossing approximately 15 TCs or 3 BCs. 7.3 Network elements All network elements shall be clocks according to this standard, conformant media converters and/or conformant links. 7.4 Requirements for grandmaster
32、s 7.4.1 Grandmaster time inaccuracy A grandmaster-capable clock shall have a time inaccuracy measured between its applied time reference signal and the produced synchronization messages that is smaller than 250 ns. NOTE This value corresponds to an IEC 61588:2009 clockAccuracy of 22 hex; IEC 61588 d
33、efines clockAccuracy. In case the grandmaster-capable clock has no time reference signal, IEC 61588:2009, J.4.4.1, shall apply. 7.4.2 Grandmaster holdover A grandmaster shall remain within the time inaccuracy of 7.4.1 for a holdover time of at least 5 s after losing its time reference signal, given
34、that it was in steady state. 7.4.3 Grandmaster clockClass in holdover and recovery A grandmaster clock shall have an IEC 61588:2009 clockClass of: 6 while connected to its time reference signal and in steady state; 7 after loss of time reference signal, while in holdover; 52 when its time error exce
35、eds 7.4.1; 187 when its time error exceeds 1 s; 6 after recovering the time reference signal and in steady state. NOTE 1 This modifies IEC 61588:2009, Table 5, for the timing requirements of this profile. NOTE 2 The timeTraceable bit of the flagField indicates if the grandmaster is currently locked
36、to a recognized standard time source or has a stated uncertainty to a recognized standard time source. The clockClass = 6 indicates that the grandmaster is currently locked to its time reference signal. The clock class 6 appears twice, once before loss of time reference signal, and once after recove
37、ry of that signal. 7.5 Requirements for TCs A TC shall introduce less than 50 ns of time inaccuracy, measured between the applied synchronization messages at any ingress port and the produced synchronisation messages at any egress port, given it is in steady state. NOTE This time inaccuracy cumulate
38、s the time errors in measuring the residence delay, measuring the peer delay in the ingress port and responding to the peer delay measurement from the downstream clocks in the egress port(s). It does not include time error due to asymmetry in either link, nor introduced by the upstream or downstream
39、 peer devices involved in the peer delay measurements. This time inaccuracy may be measured using peer devices with known contribution of the peer delay measurement to time error and using links with known or negligible asymmetry, and subtracting those amounts from the observed TC time error. PD IEC
40、/PAS 61850-9-3:2015 10 IEC PAS 61850-9-3:2015 IEC 2015 7.6 Requirements for BCs 7.6.1 BC time inaccuracy A BC shall introduce less than 200 ns of time inaccuracy between the port in the SLAVE state and any port in the MASTER state, given it is in steady state. NOTE This time inaccuracy cumulates the
41、 time errors in local clock adjustment, measuring the peer delay in the port in the SLAVE state and responding to the peer delay measurement from the downstream clocks in the port(s) in the MASTER state. It does not include time errors due to asymmetry in either link, nor introduced by the upstream
42、or downstream peer devices involved in the peer delay measurements. This time inaccuracy may be measured using peer devices with known contribution of the peer delay measurement to time error and using links with known or negligible asymmetry, and subtracting those amounts from the observed BC time
43、error. 7.6.2 BC as free-running grandmaster In case the BC has no port in the SLAVE state and no time reference signal, IEC 61588:2009, J.4.4.1, shall apply. 7.6.3 BC as master in holdover A BC shall remain within the time inaccuracy of 7.4.1 for a holdover time of at least 5 s after losing its time
44、 reference signal or PTP synchronization, given that it was in steady state. 7.7 Requirements for media converters Media converters that support IEC 61588 are considered as TCs or BCs and are subject to the requirements of 7.5 and 7.6, respectively. Media converters (e.g. fibre to copper) introduce
45、a delay, considered in peer-to-peer delay measurement. This delay may suffer from a significant jitter and may be different in both directions. Network engineering should use only media converters with known behaviour to estimate the network time inaccuracy at every slave clock. Media converters sha
46、ll present a jitter of less than 50 ns and an asymmetry of less than 25 ns. 7.8 Requirements for links Links present a predictable and nearly constant link propagation delay (about 5 s/km for fibre or copper), whose average value is regularly calculated by peer-to-peer delay measurement. NOTE Radio
47、links are not considered. Since delay asymmetry is not measurable, network engineering must know it to compensate it. Links shall present a propagation asymmetry of less than 25 ns or shall have a known propagation asymmetry with an asymmetry variation of less than 25 ns. 7.9 Network engineering To
48、achieve the required network time inaccuracy, careful network design is required, considering the placement of masters and redundant masters and possible network topology changes because of reconfigurations so as not to exceed the number of allowed TCs and BCs. The network designer should only selec
49、t network elements knowing their contribution to network time inaccuracy and dependencies on the operating conditions. The network designer should estimate the network time inaccuracy for all slave clocks. PD IEC/PAS 61850-9-3:2015IEC PAS 61850-9-3:2015 IEC 2015 11 The network designer should use network elements with stricter specifications in more demanding applications or larger networks. The network time inaccuracy of the time signal available at a given clock is computed at engineering time as: GM+ NTC
