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INTERNATIONAL STANDARD IEC 61850-9-1 Communication networks and systems in substations – Part 9-1: Specific Communication Service Mapping (SCSM) ...
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IEC 61850-9-1 First edition 2003-05
Communication networks and systems in substations – Part 9-1: Specific Communication Service Mapping (SCSM) – Sampled values over serial unidirectional multidrop point to point link
Reference number IEC 61850-9-1:2003(E)
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Publication numbering As fr om 1 Ja nua ry 199 7 al l IE C pub li ca ti ons ar e is su ed wi th a des ig nat io n in the 60000 series. For example, IEC 34-1 i s now referred to as IEC 60034-1.
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618 50- 9-1 9- 1 © IEC:2003(E)
CONTENTS FOREWORD ..................................... ....................................................... .................................... .................................... .................................... .............................. .............. 4 INTRODUCTION .................................... ...................................................... ..................................... ..................................... .................................... ......................... ....... 6
Scope ......... .............. ......... ......... ......... ......... ......... ......... ......... ......... ......... ......... ......... ......... .......... ......... ......... ......... ......... ......... ......... ......... ......... ......... ......... ........ ....... ...... 7
Normative Normative references....... references............ ......... ......... ......... ......... ......... ......... ......... ......... ......... ......... ......... ......... .......... ......... ......... ......... ......... ......... ......... ......... ...... 8
Terms and definitio definitions...... ns........... ......... ......... .......... ......... ......... ......... ......... .......... ......... ......... .......... ......... ......... ......... ......... .......... ......... ......... .......... ......... .... 8
Abbreviat Abbreviations......... ions.............. ......... ......... .......... ......... ......... ......... ......... ......... ......... .......... ......... ......... ......... ......... ......... ......... .......... ......... ......... ......... ......... ......... ...... 8
Principle Principle of mappin mapping g to to the the serial serial unidi unidirecti rectional onal multidrop multidrop point point to to point point link............. link.................. ........ ... 9 5.1
Communicatio Communication n stack.......... stack............... ......... ......... .......... ......... ......... ......... ......... .......... ......... ......... .......... ......... ......... ......... ......... .......... ......... ...... 9 5.1.1 5.1.1
Physica Physicall layer....... layer............ .......... ......... ......... ......... ......... .......... ......... ......... .......... ......... ......... ......... ......... .......... ......... ......... .......... .......10 ..10
5.1.2 5.1.2
Link layer layer .......... .............. ......... .......... ......... ......... ......... ......... .......... ......... ......... ......... ......... ......... ......... .......... ......... ......... ......... ......... .......11 ..11
5.1.3 5.1.3
Network Network layer layer ......... .............. ......... ......... ......... ......... .......... ......... ......... ......... ......... ......... ......... .......... ......... ......... ......... ......... ......... ......12 ..12
Transport Transport layer..... layer.......... ......... ......... .......... ......... ......... ......... ......... .......... ......... ......... ......... ......... ......... ......... .......... ......... ......... ........1 ...12 2
Session Session layer layer ......... .............. ......... ......... ......... ......... ......... ......... .......... ......... ......... ......... ......... ......... ......... .......... ......... ......... ......... ......12 ..12
Presentati Presentation on layer layer ......... .............. .......... ......... ......... ......... ......... .......... ......... ......... .......... ......... ......... ......... ......... .......... ......... .......12 ...12
5.1.7 5.1.7
Applicatio Application n layer..... layer.......... ......... ......... .......... ......... ......... ......... ......... .......... ......... ......... .......... ......... ......... ......... ......... .......... ......... .....12 .12
Restriction Restrictions..... s.......... ......... ......... .......... ......... ......... .......... ......... ......... .......... ......... ......... ......... ......... .......... ......... ......... .......... ......... ......... ......... ......... ......12 .12
Mapping Mapping of common types..... types......... ......... ......... ......... .......... ......... ......... .......... ......... ......... ......... ......... .......... ......... ......... .......... ......... ......... .......... .......12 ..12 6.1
Object Object name ......... ............. ......... ......... ......... ......... ......... .......... ......... ......... ......... ......... ......... ......... .......... ......... ......... ......... ......... .......... ......... ......... ......12 .12
Object Object reference reference ......... ............. ......... .......... ......... ......... ......... ......... ......... ......... .......... ......... ......... ......... ......... .......... ......... ......... ......... ......... ......... ....12 12
Mapping Mapping of the the model for transmiss transmission ion of of sampled sampled values values using using multica multicast..... st.......... .......... .......... .........1 ....13 3 7.1
Mapping Mapping of the multicast multicast sampled sampled values values services....... services............ .......... .......... .......... ......... ........ ......... .......... ......... .....13 .13
Mapping Mapping of the update update of the sampled sampled value value buffer.......... buffer............... ......... ......... .......... .......... .......... ......... ......... ......14 .14
Addition Additional al definit definitions ions for for the transmis transmission sion of of sampled sampled analogue analogue value values s .......... ............... ......... ....14 14 7.3.1 7.3.1
Applicati Application on layer layer functiona functionality lity ......... .............. ......... ......... .......... .......... .......... ......... ......... .......... .......... .......... ......... .......1 ...14 4
Presentat Presentation ion layer layer functional functionality....... ity........... ......... .......... .......... .......... ......... ......... .......... .......... .......... ......... ......... ........15 ...15
7.3.3 7.3.3
Transport Transport layer layer functional functionality ity .......... .............. ......... .......... .......... .......... ......... ......... .......... .......... .......... ......... ......... .........1 ....15 5
Mapping Mapping of the common data classes............ classes................. .......... ......... ......... ......... ......... .......... ......... ......... .......... ......... ......... ......... ......... ......16 .16 8.1
Overview Overview ......... ............. ......... .......... ......... ......... ......... ......... ......... ......... .......... ......... ......... ......... ......... ......... ......... .......... ......... ......... ......... ......... .......... ......16 .16
Addition Additional al definit definitions ions for for the mapping mapping of the the common common data data classes classes ......... .............. .......... .......... ......16 .16
Annex An nex A (no rmat rm ative ive ) Defin De fin iti on of dat a s et ins tan ces ce s a nd rel ate d m ult ica st sam ple d value control instances ................................. .................................................. .................................. .................................. .................................. ......................19 .....19 Annex An nex B ( inf orm ati ve) Cal cul ati on of requi re qui red re d b and wid th ... ... ... ..... .. ... ... ..... .. ... ..... .. ... ..... .. ... ... ..... .. ... ..... .. ... ..... .. ... ... ..22 .. 22 Annex An nex C (in form fo rmati ati ve) Defin De fin iti ons of log ica l n ode ins tance ta nce nam es and dat a nam es related to the data sets ................................... .................................................... ................................... ................................... ................................. ...................24 ...24 Annex An nex D (in form fo rmati ati ve) Ele ctr oni c tra nsf orme or mers rs blo ck dia gram gr am and con fig urati ur ati on exa mp le ... ..28 .. 28
61850-9-1 © IE I E C : 20 0 3( E )
Figure 1 – Example for the the use of the serial serial unidirectional unidirectional multidrop point point to point link link ............ 7 Figure 2 – Communication stack............................. stack.............................................. .................................. .................................. .............................10 ............10 Figure 3 – Concatenation of several ASDU’s into one APDU .............................. .............................................. ....................14 ....14 Figure A.1 – Data set for status indication........................................ indication......................................................... .................................. .....................20 ....20 Figure B.1 – Ethernet Fram e Format......................... Format........................................... ................................... .................................. ..........................23 .........23 Figure C.1 – Contents Contents of the universal universal data set based on the specification in IEC IEC 60044-8 ....27 Figure D.1 – Example for general block diagram of a single-phase single-phase electronic electronic transformer .....28 Figure D.2 – Example for electronic transformers configuration ............................. ............................................. .................29 .29
Table 1 – Mapping of the object reference .................................. ................................................... ................................. ..........................13 ..........13 Table 2 – Mapping of the multicast sampled value services.................................. services................................................. ..................13 ...13 Table 3 – Encoding for the transmission of sampled value buffer ................................ ...........................................15 ...........15 Table 4 – Extended common data class single point status information ................................ ..................................16 ..16 Table 5 – Encoding of the common data class SPS used for the universal data data set ................16 ................16 Table 6 – Encoding of the com mon data class MV ................................. ................................................. ................................ ................17 17 Table 7 – Encoding of common data class SPS used f or the status indication group...............18 group...............18 Table A.1 – Predefined m ulticast sampled value control block instances relating to the transmission of the Universal Data Set according to IEC 60044-8 ................................ .................................19 .19 Table A.2 – Predefined multicast sampled value value control block instances instances relating to the transmission of status indications ................................. ................................................. ................................. .................................. ........................21 .......21 Table B.1 – Selection guide for Ethernet physical layer (receiving node)............................. node).................................22 ....22 Table B.2 – Selection guide for Ethernet physical layer (sending node) ............................ ..................................22 ......22 Table C.1 – Definitions of logical instance instance name and data names related to the universal data set ................................... .................................................... ................................... ................................... .................................. ...........................24 ..........24 Table C.2 – Definitions of logical instance name and data names related to the status indication data set .................................. ................................................... .................................. .................................. .................................. ............................26 ...........26
INTERNATIONAL ELECTROTECHNICAL COMMISSION __ _____________ COMMUNICATION NETWORKS AND SYSTEMS IN SUBSTATIONS – Part 9-1: Specific Communication Service Mapping (SCSM) – Sampled values over serial unidirectional multidrop point to point link
FOREWORD 1) The IEC (Internationa l Electrotechnical Commission) is a worldwide organisation for standardisat ion comprising all national electrotechnical electrotechnical committees (IEC National Committees). The object of the IEC is to promote international co-operation on all questions concerning standardisation in the electrical and electronic fields. To this end and in addition to other act ivities, the I EC publishes Int ernational Stand ards. Their preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with m ay participate in this preparatory work. International, governmental and non-governmental organisations liaising with the IEC also participate in this preparation. The IEC collaborates closely with the International Organisation for Standardisation (ISO) in accordance with conditions determined by agreement between the two organisations. 2) The formal decisions or agreem ents of the IEC on technical mat ters express, as nearly as possible, an international consensus of opinion on the relevant subjects since each technical committee has representation from all interested National Committees. 3) The documents produced have the form of recommendations for international use and are published in the form of standards, technical specifications, technical reports or guides and they are accepted by the National Committees in that sense. 4) In order to promote international unif ication, IEC National Committ ees undertake to apply IEC Internationa l Standards transparently to the maximum extent possible in their national and regional standards. Any divergence between the IE C Standard and the c orresponding nation al or regional standard sha ll be clearly indicated in the latter. 5) The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any equipment declared to be in conformity with one of its standards. 6) Attention is drawn to the possibility that some of the elements of this International Standard may be the subject of patent rights. The IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 61850-9-1 has been prepared by IEC technical comm ittee 57: Power system control and associated communications. The text of this standard is based on the f ollowing documents: F DI S
Re p o r t o n v o t i n g
5 7 / 6 1 9 / F DI S
5 7/ 63 6/ RVD
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IEC 61850 consists of the following parts, under the general title Communication Communication networks and systems in substations. Part Part 1:
Intr Introd oduc ucti tion on and and over overvi view ew
G los s a r y 1
P ar ar t 3 :
G en en er er al al r eq equ ir ir em em en ent s
Part Part 4:
Syst System em and and pro proje ject ct mana manage geme ment nt
Part Part 5:
Communi Communicat cation ion requi requireme rements nts for functi functions ons and device devices s model models s 2
Configurat Configuration ion descri descriptio ption n languag language e for communica communication tion in electri electrical cal substat substations ions related to IEDs 1
Part 7-1: 7-1: Basic Basic communication communication structure structure for substatio substation n and feeder equipment equipment – Principles Principles and models Part 7-2: Basic Basic communication communication structure structure for substatio substation n and feeder feeder equipment – Abstract communication service interface (ACSI) Part 7-3: 7-3: Basic Basic communicatio communication n structure structure for substati substation on and feeder feeder equipment equipment – Common data classes Part 7-4: Basic Basic communication communication structure structure for substatio substation n and feeder equipment equipment – Compatibl Compatible e logical node classes and data classes Part 8-1: Specific Specific communicati communication on service service mapping mapping (SCSM) (SCSM) – Mappings Mappings (ISO/IEC 9506-1 and ISO/IEC 9506-2) and to ISO/IEC 8802-3 1
Part 9-1: Specific Specific communicatio communication n service mapping mapping (SCSM) – Sampled values values over serial unidirectional unidirectional multidrop point to point link Part Part 9-2: 9-2: Specific communication service mapping (SCSM) – Sampled values over ISO/IEC 8802-3 1 Part Part 10: 10:
Conf Confor orma manc nce e test testin ing g1
The relationship between IEC 60044-8 and this standard is as follows: IEC 60044-8 defines a merging unit as interface to electronic current and voltage transformers. Data objects provided by that merging unit are specified in IEC 60044-8. This standard specifies a serial communication interface between the merging unit and equipment using the digital output of the merging unit like protection or metering equipment. For the specification of that serial interface, a subset of the abstract communication services defined in IEC 61850-7-2 are mapped on an ISO/IEC 8802-3 based communication link. The committee has decided that the contents of this publication will remain unchanged until 2005. At this date, date , th e public pu blic ation atio n will wi ll be be •
r ec o nf ir m e d;
w it hd r a wn;
repl replac aced ed by a rev revis ised ed edit editio ion, n, or
a m e nd e d.
A bil ing ual ver sion si on of thi s stand st and ard ar d m ay be issue is sue d a t a l ate r dat e.
——————— 1
INTRODUCTION This part of IEC 61850 applies to electronic current and voltage transformers (ECT and EVT) with a digital output via a merging unit, for use with electronic measuring instruments and electronic protective devices. The transformer technology can be based on optical arrangements equipped with electronic components, on air core coils (with or without a built-in integrator) or, on iron core coils with integrated burden and used as a current to voltage converter, alone or equipped with electronic components. For digital output, this standard takes into account a point to point connection from the merging unit to electronic measuring instruments and electronic devices. This mapping allows interoperability between between devices from different manufacturers. This standard does not specify individual implementations or products, nor does it constrain the implementation of entities and interfaces within a computer system. This standard specifies the externally visible functionality of implementations. Reading Guide •
The point to point point transformer interface as defined defined here is based based on the concepts concepts described in IEC 60044-8. This standard extends this concept and proposes an alternative link layer to provide provide a solution solution for transmitting sampled sampled measured values values via Ethernet based interfaces. For the definition and measurement of the accuracy, synchronisation methods, data rates etc. of the transformers, refer to IEC 60044-8.
This document can best best be understood if the reader reader is thoroughly thoroughly familiar with Parts 7-1, 7-2, 7-3 and 7-4 of this Standard.
No explanations explanations to the ACSI services are given in this part of the standard. standard. For detailed detailed information about the use of the ACSI services, refer to IEC 61850-7-2.
This part of IEC 61850 specifies the specific communication service mappings for the communication between bay and process level and it specifies a mapping on a serial unidirectional multidrop point to point link in accordance with IEC 60044-8. This part of IEC 61850 specifies a mapping of the abstract service for the transmission of sampled values (as defined in IEC 61850-7-2) on a serial unidirectional unidirectional m ultidrop point to point link in accordance with IEC 60044-8. It applies to the communication between merging units of electronic current (ECT) or voltage-transformers (EVT) and bay devices such as protection relays. If higher requirements on sampling rate, further sampled measured value data sets in addition to the universal data set, inter-bay communication and synchronisation apply, these will be covered by IEC 61850-9-2 3. Figure 1 shows the schematics of this interface.
Serial unidirectional multidrop point to point link Multiple ports
Proprietary link
Synchronisation, monitoring, test and configuration interfaces
Merging unit Proprietary link
Binary inputs IEC 812/03
Figure 1 – Example for the use of the serial unidirectional multidrop point to point link
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60044-7: Instrument Transformers – Part 7: Electronic voltage transformers IEC 60044-8: Instrument Transformers – Part 8: Electronic current transformers IEC 60874-10-1:1997, Connectors for optical fibres and cables – Part – Part 10-1: Detail specification for fibre optic connector type BFOC/2,5 terminated to multimode fibre type A1 IEC 61850-7-2: Communication networks and systems in substations – Part 7-2: Basic communication structure for substation and feeder equipment – Abstract communication service interface (ACSI) IEC 61850-7-3: 61850-7-3: Communication networks and systems in substations – Part 7-3: Basic communication structure for substation and feeder equipment – Common data classes ISO/IEC 8802-3: Information technology – – Telecommunications and information exchange between systems – – Local and metropolitan area networks – – Specific requirements – – Part 3: Carrier sense multiple access with collision detection (CSMA/CD) access method and physical layer specifications specifications ISO/IEC 8825-1: Information technology – ASN.1 encoding rules: Specification of Basic Encoding Rules (BER), Canonical Encoding Rules (CER) and Distinguished Encoding Rules (DER) IEEE 802.1Q-1998: IEEE Standards for Local and Metropolitan Area Networks: Virtual Bridged Local Area Networks IEEE 802.3: Information Technology – Telecommunication and Information Exchange Between Systems – LAN/MAN – Specific Requirements – Part 3: Carrier Sense Multiple Access with Collision Detection (CSMA/CD) (CSMA/CD) Access Method and Physical Layer Specifications Specifications
For the purpose of this part of IEC 61850, the definitions of IEC 61850-2 4, IEC 60044-7 and IEC 60044-8 apply.
ACSI ACS I
Abstr Abs tract act Commun Com mun icati ic ati on Servi Se rvi ce Int erfac er face e
ASDU ASD U
Appli App licat cat ion io n S erv ice Dat a Unit U nit
ASN.1 ASN .1
Abstr Abs tract act Synta Syn tax x Not N otati ati on num ber One
APCI APC I
Appli App lica cati tion on Pro tocol to col Con trol tr ol Infor In for mat ion io n
APDU APD U
Appli App licat cat ion io n Pro P roto tocol col Dat a Unit U nit
Att ach ment men t Unit Uni t Inter In ter fac e
A SN. 1 Bas i c En co d i ng R u l es
Ca no n i cal fo r ma t i de n t i fi e r
——————— 4
CS MA/ CD
C ar r i e r S en s e Mul t i pl e Ac ce ss /Co l l i s i o n Det e ct i o n
Da t a Fr a m e
Da t a O b j e c t
Da t a S e t G r o u p
E l ec t r o ni c C ur r e n t T ra n sf or me r s
E l e ct r o n i c V o l t a g e Tr a ns fo r me r s
L i n k L a y e r S e r v i c e Da t a U n i t
Med i a Ac ce ss Co n t r ol
MS V CB
Mu l t i ca s t S am pl e d V al u e Co n t r ol Bl o ck
M e r g i n g Un i t
P r o t o c o l D a t a Un i t
Se l e ct Be fo r e Op er at e
Se c on da r y Co nv er t e r
S CS M
Sp e ci fi c Co mm un i ca t i o n S e rv i ce s Ma pp i ng
St a t us I n di c at i o n Gr o up
Sa mp l e d An al o g ue V a l u e
Tag C on t r o l I nf or m at i o n
T PI D
T ag P r ot o co l Id en t i f i er
VID VI D
VLAN VLA N Ide I denti nti fie r
Virt Vi rtua uall Loca L oca l Are A rea a Net N etwo work rk
Principle of mapping to the serial unidirectional multidrop point to point link
This Clause gives an overview of the mapping to the serial unidirectional multidrop point to point link. It defines the comm unication stack and data unit structures for the application layer. layer. Restrictions to the application that are a consequence of this mapping are defined as well. 5.1
Figure 2 gives an overview of the communication stack. The link layer is in conformity with ISO/IEC 8802-3. This standard is usually referred to as Ethernet. In the following, the term Ethernet will be used instead of ISO/IEC 8802-3 (CSMA/CD).
SCSM for ISO/IEC 8802-3: Definition of ASDU's
MAC - Sublayer ISO/IEC 8802-3 and Priority tagging/VLAN according to IEEE 802.1Q 100Base-FX IEEE 802.3
10Base-FL IEEE 802.3
AUI-Interface IEEE 802.3
Physical layer IEC 813/03
Figure 2 – Communication stack The relevant device standards will specify whether 100Base-FX, 10Base-FL or 10Base-T is used, depending on the application. 5.1.1 5.1.1.1
Physical layer Specifications for the Medium Attachment Unit (MAU)
The connection of the merging unit to the secondary equipment can be an optical fibre transmission system. By taking into account and solving the EMC requirements, a copper based transmission system is an option. 5.1.1.2
The preferred version of the fibre optic transmission system is IEEE 802.3 100Base-FX. The 10Base-FL system could be used also for sampling rates below 48 × f r (a selection guide is given in Annex B). This interface shall be used f or applications where this media interface is already used for other communication links. It is recommended to use the BFOC connectors (IEC 60874-10-1). Two fibres are always necessary for the optical fibre transmission system in order to support the link supervision. 5.1.1.3
Twisted-pair transmission system
The twisted-pair medium according to IEEE 802.3 10Base-T could be used as an option, if appropriate electromagnetic shield measures are considered.
61850-9-1 © IE I E C : 20 0 3( E ) 5.1.2
The Ethernet broadcast address shall be used as a default value for a destination address, which consists of ones in the destination address field (the Ethernet frame format is shown in Annex An nex B). B) . For Fo r thi s reaso re aso n, no add res s con figur fi gur ation at ion is nec ess ary ar y on the pub lis her sid e. However, the destination address could be configurable as an optional feature for example, adjust a multicast address to connect a merging unit via switch to bay level devices. A unique Ethernet address shall be used as a source address. NOTE
The recommended address range assignmen ts will be specified in IEC 61850-9-2 and IEC 61850-8-1.
Priority tagging/Virtual LAN
Priority tagging tagging according to IEEE 802.1Q is used to separate time critical and high priority bus traffic for protection relevant applications from low priority busload. Structure of the tag header: Oct e t s
TPID value: 0x8100 User priority: BS3; user priority value shall be set by configuration to separate sampled analogue values and time critical protection relevant GOOSE messages from low priority busload. CFI: BS1 [0]; No Embedded RIF field follows the length/type field in the Ethernet tagged frame. VID: Virtual LAN support is optional. If this mechanism is used, the VLAN identifier (VID) shall be set by configuration. Otherwise, the VLAN identifier is set by default to 0.
0 x 8100
TPID 2 3
Us e r p r i o ri t y
An Ethe rtype based bas ed on ISO/IEC ISO /IEC 8802-3 8802 -3 MAC – Sublayer Sub layer is registe reg iste red by the IEEE Authori Aut hori ty Registration. The registered Ethertype value is 88-BA (hexadecimal). The sampled analogue value buffer update is directly mapped to the reserved Ethertype and the Ethertype PDU. Structure of the Ethertype PDU: Oct e t s
Length Ethertype PDU
Key APP ID: app lic at ion ide nt ifi er. The APP ID is use d to select sampled analogue value messages and to distinguish the application association. Reserved value range for SAV are 0x4000 to 0x7FFF. Length: number of octets including the Ethertype PDU starting at APPID (8 + m) (m < 1480). Reserved 1/Reserved 2: reserved for future standardised applications.
A P DU
– 1 2 – 5.1.3
This layer is intentionally left empty. 5.1.4
This layer is intentionally left empty. 5.1.5
This layer is intentionally left empty. 5.1.6
Empty. See additional definitions in 7.3. 5.1.7
Empty. See additional definitions in 7.3. 5.2
This specification is restricted to define the communication between the ECT/EVT related merging unit and devices on bay level which need raw data of ECT and/or EVT for their algorithms. Referring to the ACSI, only the mapping of sampled values using multicast/ broadcast is supported. The multicast sampled value control (MSVC) class is implicit. The transmission of sam pled values as specified in this standard only uses a unidirectional unidirectional link from merging unit to bay level devices with broadcast/multicast addressing. However, the devices supporting this transmission will use an interface which is fully Ethernet compatible that includes all the facilities for easy plug in. This may imply that bi-directional exchanges exist to establish and maintain good quality transmission. These exchanges are part of the lower communication layers and are specified in the r elevant standards. The use of the Ethernet link in a bi-directional way to support other exchanges should be possible according to device capability, but it should not impact transmission of the universal data set. Typical cases may be synchronisation of local clocks, configuration loading and mode switching. These features are outside the scope of this standard.
Mapping of common types Object name
For the transmission of the sampled value buffer, the object reference is encoded as integer values. The single elements of the object reference are assigned to integer values. Integer values related to logical node name and data name are defined with this SCSM. The integer value related to the logical device name will be defined by configuration tools or will be agreed by vendors of the client and server. 6.2
As def ine d in IEC 618 50- 7-2, 7- 2, the nam e str uctur uc tur e for fo r the who le pat h to an ins tan ce is as follows: / . . [.]. The object reference in this SCSM concludes the whole path of the class and instance reference. Other hierarchy levels are not separately accessible. --``````-`-`,,`,,`,`,,`---
In detail the SCSM Data Sets are mapped to the object reference as follows: Table 1 – Mapping of the object reference
ACSI ACS I Obje O bject ct name nam e
SCSM SCS M valu v alue e
< LD N a m e >
IN TEG ER U I1 6
< LN N a m e >
IN TEG ER U I 8
< Da t a N a me >
IN TE GER U I8
< Da t a A t t r i b u t e N a me >
n o t v i si b l e
NOTE It is assumed, that the data sets used for the transmission of sampled values in many cases include data objects from more than one logical node and are therefore allocated in LLN0.
Mapping of the model model for transmission of sampled sampled values using multicast multicast
There are two data sets specified in this document. The universal data set is compatible with IEC 60044-8 and the status indications is specified in Annex A. Each data set refers to one multicast sampled value control class instantiation. instantiation. The m apping of the sampled value buffer update is defined. The transmission buffer refresh rate and the communication update rate are always equal and not independent from each other. T he consequences on the publisher level are:
After the sampling procedure procedure is finished, the the APDU will will be stored stored into the transmission buffer (refresh rate = sampled rate), or more than one one ASDU (n (n = number of ASDUs) could be stored into one APDU frame before the transmission buffer is refreshed (refresh rate = sampled rate/n rate/ n). For a description of the blocking mechanism, see 7.3.
Only one APDU can be stored stored into the transmission buffer, previous entries will be overwritten. The consistency of stored data will be guaranteed in case of overwriting.
To avoid avoid data overwriting, the data transmission transmission must be initiated from the communication system immediately after the buffer update process is finished.
Mapping of the multicast sampled values services Table 2 – Mapping of the multicast sampled value services ACS I s erv ice s
Eth ern et ser vic es
S en d MSVMessa g e
n ot sup po rte d
G etMS VCVa lue
no t su ppo rted
S etMSV CVal ue
– 1 4 – 7.2
Mapping of the update of the sampled value buffer
Acco Ac cordi rdi ng to the sta nda rd of IEC 618 50- 7-2 , the comm co mm unica un ica tio n system sys tem is respo re spo nsi ble for fo r updating the buffer of the subscriber. The update is directly mapped to an Ethertype reserved for IEC 61850 applications based on ISO/IEC 8802-3 MAC – Sublayer. Sublayer. However, the communication stack used does not provide the following functionalities: •
Initiating the update update of the the sampled value buffer buffer over the the communication link. This is an application layer functionality.
Encode the abstract abstract data data types. types. This is a presentation layer functionality. functionality.
Concatenation and segmentation of ASDU's is not supported.
NOTE Segmentat ion is not further considered, since the maximum frame length of the link layer protocol is sufficient.
Therefore, the additional definitions of 7.3 apply. 7.3 7.3.1
Additional definitions for the transmission of sampled analogue values Application layer functionality
The mapping provides the capacity, to concatenate more than one ASDU into one APDU before the APDU is posted into the transmission buffer. The number of ASDUs which will be concatenated into one ASDU is defined with a configuration parameter and related to the sample rate. Details are shown in Figure 3.
APCI (Application – Protocol Control Information)
ASDU's (Application (Application – Service Data Unit)
No. of ASDUs (UI16)
ASDU 1 ASDU 2
APDU (Application (Application – Protocol Data Unit)
ASDU n
IEC 814/03
Figure 3 – Concatenation of several ASDU’s ASDU’s into one APDU An ASN. AS N.1 1 tag and len gth accor ac cor din g to ISO/I IS O/I EC 882 5-1 5- 1 is add ed up fr ont as a par t of the th e APC I. This tag specifies an octet string and is defined as context-specific and primitive (0x80) according to the ASN.1 basic encoding rules. The ASN.1 grammar for the sampled analogue value messages are defined as follows to ensure data consistency in combination with further sampled analogue value messages as described in this SCSM. IEC61850 DEFINITIONS DEFINITIONS IecSav Iec SavPdu Pdu ::= CHO CHOICE ICE { 9-1-Pdu savPdu
[0] IMPLICIT OCTET STRING, -- Used for 9-1 APDU [1] IMPLICIT SavPdu, -- Reserved for 9-2 APDUs
-- othe others rs TBD TBD } --``````-`-`,,`,,`,`,,`---
61850-9-1 © IE I E C : 20 0 3( E ) 7.3.2
Presentation layer functionality
For the transmission, the sampled value buffer is encoded as specified in Table 3. Table 3 – Encoding for the transmission of sampled value buffer Abstr act B uffe r For mat according to IEC 61850-7-2 Attri bute Name
Ms vI D
Coding in IEC 61850-9-1
Attr ibute Type
V IS IB LE S TR I NG6 5
OC TET : Ta g
T ag is e n co de d ac c o rd in g to ASN.1 Basic enco ding rule s
OCTET CTET STRI STR ING NG:: Len Lengt gth h
Leng Length th is enco encode ded d acc accor ordi ding ng to ASN.1 Basic enco ding rule s
UI 16 : N o. o f ASDU s
Nu mbe r of AS DU wh ic h wil l concatenated into one APDU and stored into the sampled value buffer
OCTE T S TR I NG
Br oa dc a st MAC a d dr e ss i s pa r t of the Ethernet header
UI 16 : Le ng th
Le ng th o f th e AS DU ad de d a s header (UI = Unsigned Integer)
OptF ld s
PACK ED LIS T
Da tSe t
Ob j ec tR e fer en c e
LNName DataSetInstanceName DataSetName
N ot map pe d
UI8: UI8: UI16:
LDName S amp le [1 .. n]
V a l u e o f t h e m e mb e r o f the instance of the DATASET
Encoding of common data classes
S mpCnt
I N T16 U
U I 16
C o u n te r s p e c i f i c a t i o n s e e IEC 60044-8
R e fr Tm
T ime Sta mp
Co n fR ev
IN T3 2U
S m p S yn c h
S mpR a te
IN T1 6U
N o t ma p p e d U I8
Co n fi gu ra tio n r evi sio n nu mb er will be incremented each time that the configuration of the logical device changes. Default value is NULL S ee IE C 60 04 4- 8 sta tus wo r d attribute “NotSynch”
0 = n ot d efi n e d; 1 – 255 = number of samples per cycle related to f r
NOTE For the encoding of the samples, the rules for the encoding of the common data classes apply for the SIG. The mapping of the sampled values and status attributes in the universal data set is optimised according to the specifications in IEC 60044-8. It is not necessary that all possible transformers be connected to the merging unit. In this case, in the universal data set for the current or respectively voltage values not used, zeros are transmitted and the relevant data invalid bits are set.
Transport layer functionality
The communication system of the publisher has to send the sampled value buffer over the communication link after every buffer refresh. The buffer refresh rate depends on the sampling rate and the number of concatenated ASDUs as specified in Clause 7.
– 1 6 –
Mapping of the common data classes
For the use of the common data classes defined in IEC 61850-7-3 with the model for the transmission of sampled analogue values, the definitions of 8.2 apply. 8.2
Additional definitions for the mapping of the common data classes
To support the mapping to a bitstring based status indication group, an extended common data class SPS will be defined as follows by using the name space mechanism specified in IEC 61850-7-2. Table 4 – Extended common data class single point status information SPS class Attr ibute Name DataN DataName ame
Attri bute Type
Value / Val ue R ange
Inheri Inherite ted d from from Data Data Class Class (see (see IEC IEC 61850 61850-7-7-2) 2)
DataAttribute status stVa l
d c hg
TR U E | F ALSE
A C _ U DS _ M
gr pVa l
BIT ST R IN G
dc h g, dupd
AC_SI G_M
q c hg
configuration, description and extension c dc N s
V I S I B LE S T R I N G 2 5 5
“ IE C 61 85 0- 9- 1: 20 03 ”
Abbre viati on
AC_U DS_M
Attri bute is m anda tory, if u niver sal data set is su pport ed
AC_S IG_M
Attri bute is ma ndato ry, if st atus indi cati on g roup is su ppor ted
Data attribute name gr pVa l
Semantics Bitstr in g wh e re e ac h bi t re pr e sen ts a sta tus
The common data classes of IEC 61850-7-3 and of this standard used in the context of the transmission of sampled analogue values shall be encoded as specified in Tables 5, 6 and 7 (only status attributes are shown). Table 5 – Encoding of the common data class SPS used for the universal data set Common data class SPS (IEC 61850-9-1) Attr ibute name
C odin g in IEC 6 18 5 0 -9 -1
Com men t
stVa l
BOOLE AN <0> = FALSE, OFF <1> = TRUE, ON
Status attribute of the universal data set according to IEC 60044-8.
g rp Va l
No t map pe d
N ot ma ppe d
N o t ma ppe d
NOTE The transmission of information with the common data class SPS is only supported in the context of the universal data set that is defined in IEC 60044-8.
Table 6 – Encoding of the common data class MV Common data class MV (IEC 61850-7-3) Attr ibute name i n st M a g
An al og u eVa l ue
A na lo gu eV al ue
Attr ibute type No t ma pp ed
INT32 FLOATING POINT32
UI16 -
Sampled analogue values of the universal data set according to IEC 60044-8.
EN U MER AT ED
No t map pe d , se e N ote 1
Qu al ity val id ity
CODE D E NU M
B O O LE A N <0> = valid <1> = questionable, invalid
detail-qual source test operatorBlocked
PACKED LIST CODED ENUM BOOLEAN BOOLEAN
T ime S tamp
No t ma pp e d, se e Note 2
mapped mapped mapped mapped
NOTE 1 According to IEC 61850-7-3, range is an optional attribute and is not required in the sampled value buffer format defined in IEC 61850-7-2. NOTE 2 According to IEC 61850-7-3, t is a mandatory attribute. However, in the specification of the sampled value buffer format as defined in IEC 61850-7-2, t is not included with the data object values; there is only one sample counter attached that indicates the refresh of the universal data set sampled values as specified in IEC 60044-8.
However, for the universal data set, the encoding of the list of data object values does not follow some general rules but is instead optimised. The encoding of the list of data object values is defined in IEC 60044-8.
– 1 8 –
Table 7 – Encoding of common data class SPS used for the status indication group Common data class SPS (IEC 61850-7-3) Attr ibute name
C odin g in IEC 6 1 8 5 0 -9 -1
g r pVa l
B S1 6 <0> = FALSE, OFF <1> = TRUE, ON
16 individual status values. See Annex A
BS16 <0> = VALID <1> = INVALID
16 individual quality indications related to the status values. See Annex A
Qu al ity vali di ty ( IV )
CODED EN U M
BS 1 [ 0] <0> = VALID <1> = INVALID
deta il Qua l
P ACK ED LIST
BS 7 [1] = oscillatory (OS) [2] = failure, external error (EE) [3] = oldData (OD) [4] = inconsistent (IC) [5..7] = reserved (RE)
source test operatorBlocked t
CODED ENUM BOOLEAN BOOLEAN
Further elements of detailqual not mapped
Not mapped Not mapped Not mapped
T ime Stamp Se c on dsS in c eE po c h
I NT 32
U I 32
Fr a c ti on OfS e c on d
IN T2 4
U I 24
Time Qu al ity
Lea pSe c o ndsK no wn (LK)
B OOLEA N
B S1 [0 ] <0> = FALSE
SecondsSinceEpoch SecondsSinceEpoch includes leap seconds
<1> = TRUE C lo c kFa i lu re (C F)
BS 1 [0 ] <0> = FALSE,
Time function is unreliable
<1> = TRUE,
ClockNotSynchronized (NS)
B S1 [ 1] <0> = FALSE,
Clock is not synchronized to the reference source
<1> = TRUE, T ime Ac c u ra c y
CODED EN UM
R e s e r ve d
Annex A (normative) Definition of data set instances and related multicast sampled value control instances
ASDU for universal data set
This data set is defined in IEC 60044-8, an overview is shown in Annex C. Table A.1 – Predefined multicast sampled value control block instances relating to the transmission of the Universal Data Set according to IEC 60044-8 M SVCB att ribu te
Ms vCBN a m
I mpl ic it ( IE C 60 04 4- 8)
M s vC B R e f
N ot visi bl e
S vEn a
E n a b l e d d u r i n g t h e s ta r t u p p h a s e
Ms vID
Br oa dc a st MAC a ddr e ss (o pti on a l mul ti c ast i f c on fig ur ab le )
= UI16 = or configurable . = . = <2>.< 1>
C on fR ev
P re c on fig ur ed
Pr e c on fig ur ed
re fre sh -ti me= FALS E sample-synchronised=TRUE sample-rate=TRUE
ASDU for status indicati on data set
The status indication data set contains binary input status and quality information which will be transmitted periodically in the same way as the sampled analogue values. The intention is to give for example merging units or simpler devices the possibility to transmit binary input input status indications, as a kind of distributed I/O mechanism based on the sampled value class m odel, to avoid the implementation of the reporting models specified in IEC 61850-7-2. Only one data set instance is permitted. This data set is related to the data name “Ind” of the logical node GGIO.
Oc t et s
msb Len gt h
Le ng t h = 2 1
Data set m s b reference msb
L N Na m e = 2
Da t a S e t Na m e = 2
LDName 6
S 16 S 15 S 14 S 13 S 12 S 11 S 10
Q16 Q15 Q14 Q 13 Q1 2 Q1 1 Q1 0
S9 S1 Q9
216 SecondsSinceReference
20 Res erved
LK 216 28
FractionOfSecond
msb SC
Coun t er
S am pl e Rat e
Co n f i g u r a t i o n R e v i s i o n
l sb IEC 815/03
Figure A.1 – Data set for status indication
Table A.2 – Predefined multicast sampled value control block instances relating to the transmission of status indications MSVCB a ttribu te
M s vC B N a m
Impli c it ( Sta tus i nd ic a tio ns )
No t vi si ble
En ab le d du r in g th e sta rt u p ph as e.
B r o a d c a s t M A C a d d r e s s ( o p t i o n a l mu l t i c a s t i f c o n f i g u r a b l e )
= UI16 = or configurable . = . = <2>.< 2>
Pr ec o nfi gu re d
Pr ec o nfi gu r ed
r e fre sh- time =F ALSE sample-synchronised=FALSE sample-rate=TRUE
Annex B (informative) Calculation of required bandwidth The following tables can be used as a guideline for the selection of the appropriate physical layer related to the transmission of sampled analogue values. Table B.1 – Sel ect ion io n gui de for fo r Ether Et her net physi ph ysi cal lay er (rec (r eceiv eiv ing node) no de) Number of connected MUs
10 × f r
10 Mbp s
1 0 Mb ps
12 × f r
16 × f r
20 × f r
40 × f r
1 00 M bp s
48 × f r
R ate d val ue a c c or di ng to I EC 6 004 4- 8
80 × f r
10 0 Mb ps
R ate d val ue a c c or di ng to I EC 6 00 44- 8
200 × f r
1 00 Mbp s
f r: Rated frequency (Hz). NOTE Concerning 400 × f r: the available bandwidth of 100 Mbps Ethernet is not sufficient to allow three or more MUs transmit their samples to one receiving device.
el ect ion io n guid gu ide e f or Ethe Et hern rnet et physi ph ysi cal ca l l aye r ( sen ding di ng node no de)) Table B.2 – S elect S a m pl i n g r a t e
10 Mbp Mbpss
Rate Rated d valu value e acco accord rdin ing g to to IEC IEC 600 60044 44-8 -8
f r: Rated frequency (Hz).
Ava ila ble Data Da ta rate: ra te: S R × T L × n MU ≤ D R D R: Data rate (10 Mbps or 100 Mbps). S R: Sampling rate (Hz). T L : Max. telegram length; (26 Byte Ethernet frame + 4 Byte Priority tagging + 8 Byte Ethertype PDU + 2 Byte ASN.1 tag/length + 2 Byte No. of blocks + 46 Byte universal data set + 23 Byte status indications = 111 Byte Byte × 8 Bit = 888 Bit + 96 Bit interFrameGap = 984 Bit) n MU : Number of connected MUs EXAMPLE
SR × T L × nMU = (400 × 60 Hz) × 984 Bit × 1 = 23,616 Mbps
NOTE The above equation to determine the available data rate is theoretical only. In practice, it should be calculated with a reserve of approximately 10 %. In real applications, the available data rate depends normally on the CPU-power within the sender or receiver.
Header MAC
APD U
(Pad bytes if necessary)
. IEC 816/03
Figure B.1 – Ethernet Frame Format --``````-`-`,,`,,`,`,,`---
Annex C (informative) Definitions of logical node instance names and data names related to the data sets
The following tables show the relationship between the universal data set and status indications data set object names related to the logical node and data classes defined in IEC 61850-7-4. Table C.1 – Definitions of logical instance name and data names related to the universal data set Attri bute
D a ta S e t N a m e
IN TE GE R
Da ta- R e fer en c e
Se e ne xt ta bl e
Logical node instance name p hsa TCT R
A R tg
F o r t h e u n i ve r s a l d a t a s e t a c c o r d i n g t o I E C 6 0 0 4 4 - 8 t h e i n t e g e r value is set to 1
Definition according to IEC 60044-8
R a te d ph a se c u rr en t Defines the rated current in Ampere r.m.s.
n e utTCT R
R a te d ne u tra l c u rr en t Defines the rated neutral current in Ampere r.m.s.
p hsa TVTR
R a ted ph ase vo lta ge Defines the rated voltage in 1/10 kV r.m.s.
R a ted de la y time Defines the rated delay time in µs. The rated delay time indicates the time between the instant a certain current/voltage is present at the primary terminals and the instant the transmission of the belonging digital data set starts. According to this standard, synchronisation pulses are used to synchronise several merging units. Therefore the rated delay time is not relevant for the ECT/EVT accuracy. The rated delay time value shall be high enough to allow reasonable antialiasing filters in the merging unit, but it shall not be so high that it significantly affects protection device performance. Therefore the rated delay time for this standard should be 3 000 µs (tolerance band –100 % to +10 %) for all sampled rates.
Tdr is not defined in IEC 61850-7-4. p hsa TCTR
Cu r re n t pha se A, use d fo r pr ote c tio n
p hsbT CTR
Cu r re nt p ha se B , u sed for pr ote c ti on
p hsc TCT R
Cu rr e nt p ha se C , use d fo r p ro te cti o n
C ur re n t n e utr al
p hsa TCT R 1
C u r r e n t p h a s e A ; d i f f e r e n t s c a l i n g ; u s e d f o r m e a s u r e me n t
p hsb TCTR 1
C u r r e n t p h a s e B ; d i f f e r e n t s c a l i n g ; u s e d f o r me a s u r e m e n t
p hsc TC TR 1
Cu rr e nt ph a se C; di ffer e nt sc a li n g; u se d fo r me asu re men t
Vo l tag e p ha se A
p hsb TVTR
Vo lt ag e p ha se B
p hsc TVT R
Vo lta ge ph a se C
n e utTVT R
Vol tag e n e utr al
b bTV TR
B usb ar Vo lta ge
61850-9-1 © IE I E C : 20 0 3( E ) Logical node instance name LP HD
P hyHe al th
M e r g i n g u n i t m a i n te n a n c e r e q u i r e d : This attribute is part of the first status word defined in IEC 60044-8. If the merging unit has failed, the maintenance required status shall be set. <0> = Maintenance not required <1> = Maintenance required The stVal attribute will be mapped to BIT STRING.
Mer gi ng u ni t test statu s: This attribute is part of the first status word defined in IEC 60044-8. This status shall be set if the merging unit operates in test mode and calculates sampled values internally. <0> = Normal operation <1> = Test mode activated The stVal attribute will be mapped to BIT STRING.
WkU pTi m
W a k e u p ti m e i n d i c a t i o n : This attribute is part of the first status word defined in IEC 60044-8. Wake up time indication shall be set during a wake up time period respectively start up time period corresponding with the sampled value invalid indication. <0> = Normal operation <1> = Data not valid WkUpTim is not defined in IEC 61850-7-4.
Sync h Me th
S ync h ro ni sati on meth od: This attribute is part of the first status word defined in IEC 60044-8. The synchronisation method indicates whether the sampled values of the data set are suitable for interpolation or whether the data set values cannot be used with interpolation schemes. <0> = Data set values not to be used with interpolation schemes <1> = Data set values are suitable for interpolation; Not recommended for IEC 61850-9-1 applications SynchMeth is not defined in IEC 61850-7-4.
No tSyn c h
Mer gi ng U n it n ot sync h r on ise d: This attribute is part of the first status word defined in IEC 60044-8. If interpolation schemes are defined via the synchronisation method, the unsynchronised bit must be set. <0> = Time synchronisation activated and ready. <1> = Time synchronisation missing or invalid. NotSynch is not defined in IEC 61850-7-4.
Typ e o f CT o utp ut: This attribute is part of the first status word defined in IEC 60044-8. Type of CT output shall be set to indicate the use of air core coils. <0> = i ( t ) <1> = d(i d( i ( t ))/dt ))/d t ; air core coils. CTType is not defined in IEC 61850-7-4.
R an an ge ge Fl Fl ag ag
S PS PS
R an an ge ge flfl ag ag de de fifin es es th e sc al ali ng ng fa ct cto r fo r th e p ha ha se se cu cu rr rre nt nt d at ata fo for protection applications. <0> = 01CF H (dynamic range 50 × I r) <1> = 00E7 H (dynamic range 100 × I r) RangeFlag is not defined in IEC 61850-7-4.
– 2 6 –
Table C.2 – Definitions of logical instance name and data names related to the status indication data set Attr ibute
Da taS etN ame
IN TE G ER
S ee ne xt tabl e
Logical node name G GI O
Da ta na me In d
Defin ition F o r the statu s in di c ati on da ta se t, the in teg e r val ue is s et to 2
Comm on data class S PS
Definition B i n a r y S t a t u s I n d i c a ti o n : Individual binary status inputs and related quality status indications. Quality bit for each status point gives the sending unit (i.e. the merging unit) the ability to tag the specific bits as invalid to indicate unused or disabled status points to the receiving IED.
Binary status input:
<0> FALSE, OFF <1> TRUE, ON
Qual Qualit ity y Ind Indic icat atio ion: n:
<0> <0> V VAL ALID ID <1> INVALID
– 27 – 27
ASD U He ade r
Length of ASDU ( = 44)
LNName ( =02)
DataSetName (=01)
Rated Phase Current
Rated Neutral Current
Rated Phase Voltage
Rated Delay Time
Byte 14 Byte 15 Byte 16
lsb ASD U ( uni ver sal data set)
Current Phase A, prot. lsb
Current Phase B, prot.
Byte 18 Byte 19
Current Phase C, prot.
Byte 20 Byte 21
Byte 22 Byte 23
Current Phase A, mes.
Byte 24 Byte 25
Current Phase B, mes.
Byte 26 Byte 27
Current Phase C, mes.
Byte 28 Byte 29
Voltage Phase A
Byte 30 Byte 31
Voltage Phase B
Byte 32 Byte 33
Voltage Phase C
Byte 34 Byte 35
Voltage Neutral
Byte 36 Byte 37
Byte 38 Byte 39
StatusWord#1
Byte 40 Byte 41
StatusWord#2
Byte 42 Byte 43
B yt e 4 5
S am pli ng rat e
B yt e 4 6
C o n f i g u r a t i o n re v i s i o n n o .
ls b IEC 817/03
Figure C.1 – Contents of the universal data set based on the specification in IEC 60044-8 --``````-`-`,,`,,`,`,,`---
– 2 8 –
Annex D (informative) Electronic transformers block diagram and configuration example
General block diagram of electronic transformers transformers
Figure D.1 is a general block diagram of an electronic transformer. Depending on the application, not all of the illustrated blocks may be included in the transformers (see IEC 60044-8).
P1 Primary current sensor
Secondary converter for use with a merging unit
Secondary converter with an analogue voltage output
IV: Output invalid MR
EF: Equipment failure
MR: Maintenance request Px: Primary input
Sx: Secondary output
IEC 818/03
Figure D.1 – Example for general block diagram of a single-phase electronic transformer
General block diagram of electronic transformers transformers with a digital output and the merging unit
Up to seven current transformers and up to five voltage transformers are grouped together using a merging unit (MU). This merging unit supplies the secondary equipment with a timecoherent set of current and voltage data. Figure D.2 gives the maximum configuration. SC of ECTa (meas.) SC of ECTb (meas.) SC of ECTc (meas.) SC of ECTa (prot.) SC of ECTb (prot.) SC of ECTc (prot.)
SC of of ECT neutral ne utral
SC of EVTa SC of EVTb SC of EVTc SC of EVT neutral
t d u e r p i n u i q k c e r l o f I C
r y e l w p o p u P s
SC of EVT busbar IEC 819/03
Figure D.2 – Example for electronic transformers configuration NOTE SC of EVTa is the secondary converter of the electronic voltage voltage transformers of phase a (see IEC 60044-7). 60044-7). SC of ECTa is the secondary converter of the electronic current transformers of phase a (see IEC 60044-8).
The implementation of the merging unit as a standalone device is not a mandatory requirement. It may be part of the ECT or EVT electronics.
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ISBN 2-8318-6912-9
-:HSMINB=][^VWY: ICS 33.200
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Report "IEC 61850-9-1"