1、PC37.238/D21.32, January 2017 Draft Standard Profile for Use of IEEE 1588 Precision Time Pro tocol in Power System Applications vi Copyright 2017 IEEE. All rights reserved. This is an unapproved IEEE Standards Draft, subject to change. PC37.238/D21. 32 Draft Standard 1 Profile for Use of IEEE 1588 2
2、 Precision Time Protocol in Power 3 System Applications 4 Sponsor5 Power System Relaying Committee and6 Substations Committee of the7 IEEE Power some definitions are removed and replaced with references. Refer to 17 clause 3.1. 18 New clause 5 is added to explain relationship between different stand
3、ards, namely IEEE Std. 1588, 19 IEC/IEEE 61850-9-3 and IEEE Std C37.238. 20 Best Master Clock Algorithm requirement to check for presence of profile-specific TLV is 21 removed, to keep BMCA as specified in IEEE Std 1588-2008 clause 9.3. Refer to IEEE Std 22 C37.238-2011 clause 5.12 and new clause 6.
4、2. 23 Field definition in the IEEE_C37_238_TLV is modified while keeping backwards 24 compatibility with the previous versions data fields. Refer to IEEE Std C37.238-2011 clause 25 5.12.2 and new clause 6.2.1: 26 organizationSubType has been changed from 1 to 2. 27 GrandmasterTimeInaccuracy is repla
5、ced with Total time inaccuracy. 28 grandmasterID field fields range restriction has been removed (all 16 bits are now 29 usable), for the following reasons: 30 IEC 61850 applications will now be using the 64-bit grandmaster clock identity, so do not 31 require a short grandmasterID 32 For applicatio
6、ns that use IRIG-B, keeping this field, with an expansion to 16 bits, provides 33 the following: 34 Compatibility with IEEE Std C37.238-2011 35 A user-settable ID that does not change when the clocks hardware is replaced 36 Refer to clauses C.4, C.4.2, and D.3.3 37 38 The use of grandmasterID field
7、is now optional (zero if unused). 39 PC37.238/D21.32, January 2017 Draft Standard Profile for Use of IEEE 1588 Precision Time Pro tocol in Power System Applications xi Copyright 2017 IEEE. All rights reserved. This is an unapproved IEEE Standards Draft, subject to change. The fields of the IEEE 1588
8、 Alternate Time Offset Indicator TLV are clarified for providing the 1 local time. TLV support is mandatory and use is optional. Refer to clause 6.2.2. 2 Description of TimeInaccuracy concept is expanded and terms are redefined for clarity. Refer to 3 IEEE Std C37.238-2011 clause 5.13 and new clause
9、 6.3, and IEC/IEEE 61850-9-3 clause 3. 4 Guidance on compatibility with previous version is provided in new Annex B. 5 Additional guidance is provided on mapping between IEEE Std C37.238 and IRIG-B formats, refer 6 to Annex C. 7 Appropriate changes are made to Annex C and Annex D to include new prof
10、ile-specific TLV 8 format. 9 Guidance on the use of multiple PTP profiles in a single timing network, particularly, using 10 IEC/IEEE 61850-9-3 slave devices in an IEEE Std C37.238 network, refer to Annex E. 11 Necessary definitions are provided. Typical Ethernet-based time distribution architecture
11、 consists of a 12 reference clock, bridges, and end devices. Bridges with boundary clock functionality may also be used at 13 interconnection points between different PTP domains or PTP profiles. 14 In addition to distributing global time that is traceable to a recognized standard time source, for t
12、he cases 15 when connectivity to recognized standard time sources is lost a timing island is formed. The master clock is 16 now in holdover mode and continues to distribute its time to the local area (all devices receiving the same 17 time can be construed as being on a timing island), with the mast
13、er clocks ID (64-bit globally unique and 18 16-bit user-configurable choices are available) allowing verification of which subsequent timestamps may 19 be correctly compared. 20 The profile can be used for precise time synchronization of the devices in a substation, and between 21 substations in a l
14、arger geographical area, if performance requirements of this standard are met. 22 The use of different physical layer communication technologies to carry Ethernet frames, including 23 SONET/SDH and wireless technologies, is not precluded if they can meet performance requirements of this 24 standard.
15、 25 Time distribution specified in this standard is based on the following basic assumptions: 26 All devices that participate in time distribution support this standard (except that slave devices may 27 be IEC/IEEE 61850-9-3). 28 All devices are in the same time distribution domain. 29 All devices h
16、ave point-to-point connections to their neighbors. 30 Transmit and receive cable delay for each point-to-point connection is assumed to be symmetrical. 31 Known asymmetry in cable delay can be configured and corrected. 32 Cyber security is important in power system design. Scope of this standard doe
17、s not include that topic. 33 However other standards and work in progress do address these concerns. For instance the IEEE Standard 34 1588 Revision Working Group at the time of this publication is actively investigating methods to secure the 35 Precision Time Protocol. Other standards regarding thi
18、s subject include: IEEE Standard C37.240, IEEE 36 Standard 1686-2013 and IEC 62351-6. 37 Redundancy is an important consideration; some applications recommend or mandate support for different 38 time distribution technologies, e.g., Global Positioning System (GPS) and Inter-Range Instrumentation 39
19、Group B (IRIG-B). Support for multiple time distribution technologies at the same time is out of scope of 40 PC37.238/D21.32, January 2017 Draft Standard Profile for Use of IEEE 1588 Precision Time Pro tocol in Power System Applications xii Copyright 2017 IEEE. All rights reserved. This is an unappr
20、oved IEEE Standards Draft, subject to change. this standard. Redundancy may be provided using this standard (multiple grandmasters and/or diverse 1 network paths) using domains. 2 Specific environmental requirements are out of scope for this profile. However, devices conforming to this 3 profile may
21、 also follow environmental standards such as IEEE Standard 1613 and IEC 61850-3. Vendors 4 are encouraged to provide information regarding the effect of environmental influences on device 5 performance, perhaps including the pass/fail criteria used when determining environmental compliance. 6 7 PC37
22、.238/D21.32, January 2017 Draft Standard Profile for Use of IEEE 1588 Precision Time Pro tocol in Power System Applications xiii Copyright 2017 IEEE. All rights reserved. This is an unapproved IEEE Standards Draft, subject to change. Contents1 1. Overview 12 1.1 Scope 13 1.2 Purpose . 14 2. Normativ
23、e references 25 3. Definitions, special terms, and word usage 26 3.1 Definitions 27 3.2 Special terms 58 3.3 Word usage . 59 4. Abbreviations . 510 5. Relationship to other standards . 711 5.1 IEEE Std. 1588 . 712 5.2 IEC/IEEE 61850-9-3 713 5.3 IEEE C37.238 . 714 5.4 Configuration . 815 5.5 Compatib
24、ility with IEC/IEEE 61850-9-3 . 816 6. Standard profile for power system applications . 817 6.1 Identification 818 6.2 TLVs 919 6.3 TimeInaccuracy 1120 Annex A (informative) Operating modes . 1321 A.1 Overview . 1322 A.2 Description 1423 Annex B (informative) Compatibility with previous version . 15
25、24 Annex C (informative) Time performance parameters and their use for IEC 61850, IEEE Std. C37.118, and 25 IRIG-B applications . 1626 C.1 Time performance parameters . 1627 C.2 Use of IEEE Std C37.238 for IEC 61850 applications 1728 C.3 Use of IEEE Std C37.238 for IEEE C37.118 applications 1829 C.4
26、 Use of IEEE Std. C37.238 for IRIG-B time-distribution applications . 2030 Annex D (informative) Use of IEEE C37.238 messages for end devices (IRIG-B replacement) 2231 D.1 Use of received IEEE C37.238 Sync and Follow_Up messages to obtain a PTP time 2232 D.2 Use of received IEEE C37.238 Announce mes
27、sages to determine UTC time and local time . 2333 D.3 Use of received IEEE C37.238 Announce messages (with TLVs) to determine the times quality 2434 D.4 References for Bn. 2435 Annex E (informative) Mixed profile operation . 2636 Annex F (informative) Bibliography 2737 38 PC37.238/D21.32, January 20
28、17 Draft Standard Profile for Use of IEEE 1588 Precision Time Pro tocol in Power System Applications 1 Copyright 2017 IEEE. All rights reserved. This is an unapproved IEEE Standards Draft, subject to change. Draft Standard Profile for Use of 1 IEEE 1588 Precision Time Protocol 2 in Power System Appl
29、ications 3 IMPORTANT NOTICE: This standard is not intended to ensure safety, security, health, or 4 environmental protection. Implementers of the standard are responsible for determining appropriate 5 safety, security, environmental, and health practices or regulatory requirements. 6 This IEEE docum
30、ent is made available for use subject to important notices and legal disclaimers. 7 These notices and disclaimers appear in all publications containing this document and may 8 be found under the heading “Important Notice” or “Important Notices and Disclaimers 9 Concerning IEEE Documents.” They can a
31、lso be obtained on request from IEEE or viewed at 10 http:/standards.ieee.org/IPR/disclaimers.html.11 1. Overview 12 1.1 Scope 13 This standard specifies an extended profile for the use of IEEE Std 1588-2008 IEEE Standard for a 14 Precision Clock Synchronization Protocol for Networked Measurement an
32、d Control Systems in power 15 system protection, control, automation, and data communication applications utilizing an Ethernet 16 communications architecture. 17 The profile specifies a well-defined subset of IEEE 1588 mechanisms and settings aimed at enabling device 18 interoperability, robust res
33、ponse to network failures, and deterministic control of delivered time quality. It 19 is compliant with IEC/IEEE 61850-9-3 that specifies the preferred physical layer, Ethernet; the higher level 20 protocol used for message exchange, PTP; and the PTP protocol configuration parameters. Special attent
34、ion 21 is given to ensuring consistent and reliable time distribution within substations, between substations, and 22 across wide geographic areas. As such, this profile extends IEC/IEEE 61850-9-3 with continuous 23 monitoring of time inaccuracy, and optionally local time based on UTC. 24 1.2 Purpos
35、e 25 The purpose of this standard is to facilitate adoption of IEEE Std 1588-2008 for power system applications 26 requiring high precision time synchronization. IEC/IEEE 61850-9-3 and this standard specify a common 27 PC37.238/D21.32, January 2017 Draft Standard Profile for Use of IEEE 1588 Precisi
36、on Time Pro tocol in Power System Applications 2 Copyright 2017 IEEE. All rights reserved. This is an unapproved IEEE Standards Draft, subject to change. subset of PTP parameters and options to provide global time availability, device interoperability, and 1 failure management. This set of PTP param
37、eters and options allows IEEE 1588-based time synchronization 2 to be used in mission critical power system protection, control, automation, and data communication 3 applications. 4 2. Normative references 5 The following referenced documents are indispensable for the application of this document (i
38、.e., they must 6 be understood and used, so each referenced document is cited in the text and its relationship to this 7 document is explained). For dated references, only the edition cited applies. For undated references, the 8 latest edition of the referenced document (including any amendments or
39、corrigenda) applies. 9 IEEE Std 1588-2008, IEEE Standard for a Precision Clock Synchronization Protocol for Networked 10 Measurement and Control Systems.1,211 IEC/IEEE 61850-9-3: Communication networks and systems for power utility automation Part 9-3: 12 Precision time protocol profile for power ut
40、ility automation. 13 3. Definitions, special terms, and word usage 14 For the purposes of this document, the following terms and definitions apply. The IEEE Standards 15 Dictionary: Glossary of Terms and may synchronize to another clock, i.e., it may be a slave clock. 23 3.1.3 clock IEEE Std. 1588-2
41、008: A device participating in the Precision Time Protocol (PTP) that is 24 capable of providing a measurement of the passage of time since a defined epoch. 25 NOTEIn the case of PTP ordinary and boundary clocks that are properly synchronized, the epoch is the epoch of the 26 timescale in use. In th
42、e case of PTP transparent clocks (TCs), the epoch is locally defined and not necessarily aligned 27 with the timescale.428 3.1.4 default IEEE Std. 1588-2008: When applied to attribute values and options means the configuration 29 of a Precision Time Protocol (PTP) device as it is delivered from the
43、manufacturer. 30 1IEEE publications are available from the Institute of Electrical and Electronics Engineers, 445 Hoes Lane, Piscataway, NJ 08854-4141, USA (http:/standards.ieee.org). 2The IEEE standards or products referred to in Clause 2 are trademarks owned by the Institute of Electrical and Elec
44、tronics Engineers, Incorporated. 3The IEEE Standards Dictionary: Glossary of Terms for example, to allow 11 redundant masters and/or network paths. See also Annex E. 12 Devices conformant to this standard shall have non-volatile settings that preserve their configuration during 13 a power cycle, inc
45、luding the ability to be configured to comply with IEC/IEEE 61850-9-3. 14 5.5 Compatibility with IEC/IEEE 61850-9-3 15 All clocks claiming conformity with this standard shall comply with IEC/IEE 61850-9-3 and therefore can 16 be used without restriction in an IEC/IEEE 61850-9-3 network (simply by se
46、tting the domain number to 17 that of the network). 18 5.6 Slave-only clocks 19 Performance and features of slave-only clocks are not within the scope of this profile. In particular, for 20 lower accuracy requirements (see Annex A), slave-only clocks may not implement hardware time stamping 21 and/o
47、r delay mechanisms. Slave-only clocks may not require or make use of the time inaccuracy 22 information in the IEEE Std C37.238 TLV or the local offset information in the Alternate Time Offset 23 Indicator TLV. Such slave-only clocks may claim conformity with this profile by demonstrating that they
48、24 meet their specified level of performance when connected to an IEEE Std C37.238 conformant network. 25 6. Standard profile for power system applications 26 6.1 Identification 27 PTP Profile 28 IEEE Standard Profile for Use of IEEE 1588 Precision Time Protocol in Power System Applications 29 Versi
49、on: 2.0 30 Profile identifier: 1C-12-9D-00-00-00 31 PC37.238/D21.32, January 2017 Draft Standard Profile for Use of IEEE 1588 Precision Time Pro tocol in Power System Applications 9 Copyright 2017 IEEE. All rights reserved. This is an unapproved IEEE Standards Draft, subject to change. This profile is specified by the IEEE 1588 Profile for Power System Applications Working Group of the 1 IEEE Power System Relaying Committe
