Instrument transformers - Part 13: Stand-alone merging unit (SAMU)

IEC 61869-13:2021 is a product standard and covers only additional requirements for stand-alone merging units (SAMUs) used for AC applications having rated frequencies from 15 Hz to 100 Hz. The digital output format specification is not covered by this document; it is standardized in IEC 61869-9 as an application of IEC 61850, which specifies the power utility communication architecture.
This document covers SAMUs having standardized analogue inputs (for example: 1 A, 5 A, 3,25 V / √3 or 100 V / √3) provided by instrument transformers compliant with relevant product standards (e.g. IEC 61869-2 to IEC 61869-5, IEC 61869-7, IEC 61869-8, IEC 61869-10, IEC 61869-11, IEC 60044-1 to IEC 60044-6, IEC 60185, IEC 60186, IEEE C57.13), and aims to convert them to the digital output compliant with IEC 61869-9. Other input and output types are outside the scope of this document. Appropriate SAMU functionality can be combined with switchgear controller functionality defined in IEC 62271-3 or other IED functionality defined in IEC 60255 (all parts).
Cyber security requirements are outside the scope of this document and are covered by the IEC 62351 series.
IEC 61869-13:2021 is to be used in conjunction with IEC 61869-9:2016, Digital interface for instrument transformers, and IEC 61869­6:2016, Additional general requirements for low-power instrument transformers, which, in turn, are based on IEC 61869-1:2007, General requirements.

Transformateurs de mesure - Partie 13: Concentrateur autonome (SAMU)

L'IEC 61869-13:2021 est une norme de produits et ne couvre que les exigences supplémentaires pour les concentrateurs autonomes (SAMU) utilisés pour les applications en courant continu avec une fréquence assignée comprise entre 15 Hz et 100 Hz. Le présent document ne spécifie pas le format de sortie numérique. Celui-ci est normalisé par l'IEC 61869-9, en tant qu'application de l'IEC 61850, qui spécifie l'architecture de communication des services publics d'électricité.
Le présent document couvre les SAMU dont les entrées analogiques sont normalisées (par exemple: 1 A, 5 A, 3,25 V / √3 ou 100 V / √3), fournies par des transformateurs de mesures conformes aux normes de produits pertinentes (par exemple IEC 61869-2 à IEC 61869-5, IEC 61869-7, IEC 61869-8, IEC 61869-10, IEC 61869-11, IEC 60044-1 à IEC 60044-6, IEC 60185, IEC 60186, IEEE C57.13), et vise à les convertir en sortie numérique conforme à l'IEC 61869-9. Les autres types d'entrées et de sorties sont hors du domaine d'application du présent document. La fonctionnalité SAMU adaptée peut être combinée à un appareillage de commande de distribution, défini dans l'IEC 62271-3, ou à d'autres fonctionnalités d'IED définies dans l'IEC 60255 (toutes les parties).
Les exigences en matière de cybersécurité sont hors du domaine d'application du présent document et sont couvertes par la série IEC 62351.
L'IEC 61869-13:2021 doit être lue conjointement avec l'IEC 61869-9:2016, Interface numérique des transformateurs de mesure, et l'IEC 61869­6:2016, Exigences générales supplémentaires concernant les transformateurs de mesure de faible puissance, qui sont elles-mêmes fondées sur l'IEC 61869-1:2007, Exigences générales.

General Information

Status
Published
Publication Date
02-Feb-2021
Current Stage
PPUB - Publication issued
Completion Date
03-Feb-2021
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IEC 61869-13
Edition 1.0 2021-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Instrument transformers –
Part 13: Stand-alone merging unit (SAMU)
Transformateurs de mesure –
Partie 13: Concentrateur autonome (SAMU)
IEC 61869-13:2021-02(en-fr)
---------------------- Page: 1 ----------------------
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IEC 61869-13
Edition 1.0 2021-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Instrument transformers –
Part 13: Stand-alone merging unit (SAMU)
Transformateurs de mesure –
Partie 13: Concentrateur autonome (SAMU)
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 17.220.20 ISBN 978-2-8322-9284-6

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---------------------- Page: 3 ----------------------
– 2 – IEC 61869-13:2021 © IEC 2021
CONTENTS

FOREWORD ........................................................................................................................... 4

INTRODUCTION ..................................................................................................................... 7

1 Scope .............................................................................................................................. 9

2 Normative references ...................................................................................................... 9

3 Terms and definitions .................................................................................................... 11

4 Normal and special service conditions ........................................................................... 14

5 Ratings .......................................................................................................................... 15

6 Design and construction ................................................................................................ 23

7 Tests ............................................................................................................................. 32

8 Rules for transport, storage, erection, operation and maintenance ................................. 49

9 Safety ............................................................................................................................ 49

Annex 13A (informative) Measurement chain accuracy class considerations ........................ 50

Annex 13B (informative) Measurement examples of switching and lightning surge

voltage in gas-insulated switchgear ...................................................................................... 52

Annex 13C (normative) Low-power instrument transformer inputs ........................................ 63

Bibliography .......................................................................................................................... 67

Figure 1301 – Stand-alone merging unit (functional concept example) .................................... 7

Figure 1302 – Stand-alone merging unit application example .................................................. 7

Figure 1303 – Illustration of the SAMU position in relation to other devices and

standards in the functional chain ............................................................................................. 8

Figure 1304 – Specified input current time constant T .......................................................... 13

Figure 1305 – Dynamic range concept example .................................................................... 19

Figure 604 (modified) – Examples of subassembly subjected to EMC tests – Usual

structure used in HV AIS applications ................................................................................... 34

Figure 1306 – Gradual shutdown – Startup test .................................................................... 38

Figure 1307 – C-O-C-O duty cycle ........................................................................................ 39

Figure 13A.1 – SAMU application example ........................................................................... 50

Figure 13B.1 – Constructional example of GIS with typical surge voltage sources................. 52

Figure 13B.2 – Measured 550 kV GIS construction ............................................................... 53

Figure 13B.3 – Measurement results showing a switching surge peak voltage

magnitude caused by the DS operation in Figure 13B.2 ........................................................ 54

Figure 13B.4 – Measured 275 kV GIS construction ............................................................... 55

Figure 13B.5 – Switching and lightning surge voltage waveforms .......................................... 56

Figure 13B.6 – Switching surge voltage measurement setup on a 550 kV GIS

with/without an insulating flange surge absorber ................................................................... 57

Figure 13B.7 – Switching surge voltage measurement results when the DS was

operated with/without the surge absorber .............................................................................. 58

Figure 13B.8 – CT secondary circuit configuration for the 500 kV GIS .................................. 59

Figure 13B.9 – DS control circuit configuration for the 500 kV GIS test ................................. 59

Figure 13B.10 – Waveforms of switching surge voltage at measured point I (see

Table 13B.3) ......................................................................................................................... 60

Figure 13B.11 – Block diagram of the electronic VT with amplifier tested in the 500 kV

GIS system ........................................................................................................................... 61

---------------------- Page: 4 ----------------------
IEC 61869-13:2021 © IEC 2021 – 3 –

Figure 13B.12 – Lightning surge voltage as a function of surge absorbing capacitor value ... 61

Figure 13B.13 – Lightning surge voltage as a function of coaxial cable length ...................... 62

Table 1301 – Insulation requirements for analogue inputs ..................................................... 16

Table 1302 – Measuring accuracy class 0,05 ........................................................................ 17

Table 1303 – Limits of current error and phase error for SAMU measuring accuracy

current channels ................................................................................................................... 18

Table 1304 – Limits of current errors for SAMU TPM class rated protection accuracy

current channels ................................................................................................................... 20

Table 1305 – Limits of voltage error and phase error for SAMU voltage channels ................. 21

Table 1306 – SAMU TCTR class settings .............................................................................. 23

Table 1307 – SAMU TVTR class settings .............................................................................. 23

Table 1308 – Immunity requirements and tests ..................................................................... 24

Table 1309 – Acceptance criteria for EMC immunity tests ..................................................... 25

Table 1310 – Radiated emissions tests ................................................................................. 27

Table 1311 – Conducted emissions tests .............................................................................. 27

Table 1312 – SAMU rating plate markings ............................................................................ 28

Table 1313 – Ratings defined in accordance with IEC 61850-7-4 .......................................... 32

Table 10 – List of tests.......................................................................................................... 33

Table 1314 – Dry-heat test – Operational .............................................................................. 44

Table 1315 – Cold test – Operational .................................................................................... 44

Table 1316 – Dry-heat test at maximum storage temperature ............................................... 45

Table 1317 – Cold test at minimum storage temperature ....................................................... 45

Table 1318 – Change of temperature (Cyclic temperature test) ............................................. 46

Table 1319 – Damp heat steady state test ............................................................................ 47

Table 1320 – Cyclic temperature with humidity test ............................................................... 48

Table 13A.1 – Combined accuracy class table ...................................................................... 50

Table 13B.1 – Measurement results showing switching and lightning surge voltage

recorded for the setup in Figure 13B.4 .................................................................................. 55

Table 13B.2 – Measurement results of switching surge voltage on CT secondary circuit ....... 59

Table 13B.3 – Measurement results showing the switching surge voltage coupling to

the DS control circuit ............................................................................................................ 59

Table 13C.1 – ITRat setting units .......................................................................................... 65

Table 13C.2 – SAMU rating plate marking modifications ....................................................... 65

---------------------- Page: 5 ----------------------
– 4 – IEC 61869-13:2021 © IEC 2021
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
INSTRUMENT TRANSFORMERS –
Part 13: Stand-alone merging unit (SAMU)
FOREWORD

1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising

all national electrotechnical 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

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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 any or all such patent rights.

International Standard IEC 61869-13 has been prepared by IEC technical committee 38:

Instrument transformers.
The text of this International Standard is based on the following documents:
FDIS Report on voting
38/634/FDIS 38/640/RVD

Full information on the voting for the approval of this International Standard can be found in the

report on voting indicated in the above table.

This document has been drafted in accordance with the ISO/IEC Directives, Part 2.

A list of all parts in the IEC 61869 series, published under the general title Instrument

transformers, can be found on the IEC website.
---------------------- Page: 6 ----------------------
IEC 61869-13:2021 © IEC 2021 – 5 –

This Part 13 is to be used in conjunction with IEC 61869-9:2016, Digital interface for instrument

transformers, and IEC 61869-6:2016, Additional general requirements for low-power instrument

transformers, which, in turn, are based on IEC 61869-1:2007, General requirements.

This Part 13 follows the structure of IEC 61869-1:2007 and IEC 61869-6:2016 and supplements

or modifies their corresponding clauses.

When a particular clause/subclause of Part 1 or Part 6 is not mentioned in this Part 13, that

subclause applies. When this document states "addition", "modification" or "replacement", the

relevant text in Part 1 or Part 6 is to be adapted accordingly.

For additional clauses, subclauses, figures, tables, annexes or note, the following numbering

system is used:

– clauses, subclauses, tables, figures and notes that are numbered starting from 1301 are

additional to those in Part 1 and Part 6;
– additional annexes are lettered 13A, 13B, etc.

An overview of the planned set of standards at the date of publication of this document is given

below. The updated list of standards issued by IEC TC 38 is available at the website:

www.iec.ch.
---------------------- Page: 7 ----------------------
– 6 – IEC 61869-13:2021 © IEC 2021
PRODUCT FAMILY STANDARDS PRODUCT PRODUCTS OLD
IEC STANDARD STANDARD
IEC IEC
61869-1 61869-2 ADDITIONAL REQUIREMENTS FOR 60044-1
CURRENT TRANSFORMERS 60044-6
GENERAL
REQUIREMENTS
61869-3 ADDITIONAL REQUIREMENTS FOR 60044-2
FOR
INDUCTIVE VOLTAGE TRANSFORMERS
INSTRUMENT
61869-4 ADDITIONAL REQUIREMENTS FOR 60044-3
TRANSFORMERS
COMBINED TRANSFORMERS
ADDITIONAL REQUIREMENTS FOR
61869-5 60044-5
CAPACITOR VOLTAGE TRANSFORMERS
61869-6 61869-7 ADDITIONAL REQUIREMENTS FOR 60044-7
ELECTRONIC VOLTAGE
ADDITIONAL
TRANSFORMERS
GENERAL
REQUIREMENTS 61869-8 ADDITIONAL REQUIREMENTS FOR 60044-8
FOR LOW-POWER
ELECTRONIC CURRENT
INSTRUMENT
TRANSFORMERS
TRANSFORMERS
61869-9 DIGITAL INTERFACE FOR INSTRUMENT
TRANSFORMERS
61869-10 ADDITIONAL REQUIREMENTS FOR
LOW-POWER PASSIVE CURRENT
TRANSFORMERS
61869-11 ADDITIONAL REQUIREMENTS FOR 60044-7
LOW-POWER PASSIVE VOLTAGE
TRANSFORMERS
61869-12 ADDITIONAL REQUIREMENTS FOR
COMBINED ELECTRONIC INSTRUMENT
TRANSFORMERS AND COMBINED
STAND-ALONE SENSORS
61869-13 STAND-ALONE MERGING UNIT
61869-14 ADDITIONAL REQUIREMENTS FOR
CURRENT TRANSFORMERS FOR DC
APPLICATIONS
61869-15 ADDITIONAL REQUIREMENTS FOR
VOLTAGE TRANSFORMERS FOR DC
APPLICATIONS

The committee has decided that the contents of this document will remain unchanged until the

stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to

the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.

IMPORTANT – The "colour inside" logo on the cover page of this document indicates

that it contains colours which are considered to be useful for the correct understanding

of its contents. Users should therefore print this document using a colour printer.

---------------------- Page: 8 ----------------------
IEC 61869-13:2021 © IEC 2021 – 7 –
INTRODUCTION
General

This document is an IEC 61869 series product standard which defines additional requirements

for a stand-alone merging unit (SAMU).

The general block diagram showing a typical SAMU application example is given in Figure 1301.

Figure 1301 – Stand-alone merging unit (functional concept example)

An application example showing a three-phase dead tank circuit breaker equipped with bushing

type current transformers and a stand-alone merging unit mounted inside the breaker control

cabinet is shown in Figure 1302.
Figure 1302 – Stand-alone merging unit application example

The SAMU output may be used by many devices and is therefore of interest to multiple technical

committees in addition to TC 38, for example: TC 57: Power systems management and

---------------------- Page: 9 ----------------------
– 8 – IEC 61869-13:2021 © IEC 2021

associated information exchange, TC 95: Measuring relays and protection equipment, TC 13:

Electrical energy measurement and control, TC 85: Measuring equipment for electrical and

electromagnetic quantities, and TC 17: High-voltage switchgear and controlgear, as shown in

Figure 1303.
Figure 1303 – Illustration of the SAMU position in relation
to other devices and standards in the functional chain
Position of this document in relation to IEC 61850 (all parts) of TC 57

IEC 61850 (all parts) is a series used to define various aspects of power utility communications.

Its applicability to this document is inherited through IEC 61869-9 which defines applicable

sample rates and a digital interface in accordance with IEC 61850-9-2 and related standards.

Position of this document in relation to IEC 60255 (all parts) of TC 95

IEC 60255 (all parts) standardizes the design and performance aspects applicable to measuring

relays and protection equipment used in the various fields of electrical engineering. Since the

SAMU is an integral part of the digital substation-based protection system, its EMC performance

and environmental aspects are considered for harmonization with IEC 60255-1, IEC 60255-26

and safety aspects defined in IEC 60255-27. SAMU outputs are inputs for protection functions

covered by the IEC 60255-1xx series.

Position of this document in relation to IEC 62052 (all parts) and IEC 62053 (all parts) of

TC 13

IEC 62052 (all parts) and IEC 62053 (all parts) provide standardization in the field of AC and

DC electrical energy measurement and control. Since the SAMU digital output may be used as

input to energy measurement devices, its accuracy and EMC performance aspects should be

considered.
Position of this document in relation to IEC 62271 (all parts) of TC 17

IEC 62271 (all parts) applies to AC switchgear and controlgear designed for indoor and/or

outdoor installation and for operation at service frequencies up to and including 60 Hz on

systems having rated voltages above 1 000 V. Similar to IEC 62271-3 which defines the

switchgear interface based on IEC 61850, this document defines the SAMU which may be

installed inside the same switchgear cabinet and is therefore subject to the same environmental

stress.
---------------------- Page: 10 ----------------------
IEC 61869-13:2021 © IEC 2021 – 9 –
INSTRUMENT TRANSFORMERS –
Part 13: Stand-alone merging unit (SAMU)
1 Scope
Clause 1 of IEC 61869-1:2007 is replaced by the following:

This part of IEC 61869 is a product standard and covers only additional requirements for stand-

alone merging units (SAMUs) used for AC applications having rated frequencies from 15 Hz to

100 Hz. The digital output format specification is not covered by this document; it is

standardized in IEC 61869-9 as an application of IEC 61850, which specifies the power utility

communication architecture.

This document covers SAMUs having standardized analogue inputs (for example: 1 A, 5 A,

3,25 V / √3 or 100 V / √3) provided by instrument transformers compliant with relevant product

standards (e.g. IEC 61869-2 to IEC 61869-5, IEC 61869-7, IEC 61869-8, IEC 61869-10,

IEC 61869-11, IEC 60044-1 to IEC 60044-6, IEC 60185, IEC 60186, IEEE C57.13), and aims

to convert them to the digital output compliant with IEC 61869-9. Other input and output types

are outside the scope of this document. Appropriate SAMU functionality can be combined with

switchgear controller functionality defined in IEC 62271-3 or other IED functionality defined in

IEC 60255 (all parts).

Cyber security requirements are outside the scope of this document and are covered by the

IEC 62351 series.
2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements 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.
Clause 2 of IEC 61869-1:2007 is applicable with the following additions:
IEC 60068-2-1:2007, Environmental testing – Part 2-1: Tests – Test A: Cold
IEC 60068-2-2:2007, Environmental testing – Part 2-2: Tests – Test B: Dry heat

IEC 60068-2-14:2009, Environmental testing – Part 2-14: Tests – Test N: Change of

temperature

IEC 60068-2-30:2005, Environmental testing – Part 2-30: Tests – Test Db: Damp heat, cyclic

(12 + 12 h cycle)

IEC 60068-2-78:2012, Environmental testing – Part 2-78: Tests – Test Cab: Damp heat, steady

state

IEC 60255-27:2013, Measuring relays and protection equipment – Part 27: Product safety

requirements

IEC 60664-1:2020, Insulation coordination for equipment within low-voltage supply systems –

Part 1: Principles, requirements and tests
---------------------- Page: 11 ----------------------
– 10 – IEC 61869-13:2021 © IEC 2021
IEC 61000-4-2:2008, Electromagnetic compatibility (EMC) – Part 4-2: Testing and
measurement techniques – Electrostatic discharge immunity test
IEC 61000-4-3:2006, Electromagnetic compatibility (EMC) – Part 4-3: Testing and

measurement techniques – Radiated, radio-frequency, electromagnetic field immunity test

IEC 61000-4-3:2006/AMD1:2007
IEC 61000-4-3:2006/AMD2:2010
IEC 61000-4-4:2012, Electromagnetic compatibility (EMC) – Part 4-4: Testing and
measurement techniques – Electrical fast transient/burst immunity test
IEC 61000-4-5:2014, Electromagnetic compatibility (EMC) – Part 4-5: Testing and
measurement techniques – Surge immunity test
IEC 61000-4-6:2013, Electromagnetic compatibility (EMC) – Part 4-6: Testing and

measurement techniques – Immunity to conducted disturbances, induced by radio-frequency

fields

IEC 61000-4-8:2009, Electromagnetic compatibility (EMC) – Part 4-8 Testing and measurement

techniques – Power frequency magnetic field immunity test

IEC 61000-4-9:2016, Electromagnetic compatibility (EMC) – Part 4-9 Testing and measurement

techniques – Impulse magnetic field immunity test
IEC 61000-4-10:2016, Electromagnetic compatibility (EMC) – Part 4-10 Testing and
measurement techniques – Damped oscillatory magnetic field immunity test
IEC 61000-4-11:2020, Electromagnetic compatibility (EMC) – Part 4-11 Testing and

measurement techniques – Voltage dips, short interruptions and voltage variations immunity

tests for equipment with input current up to 16 A per phase

IEC 61000-4-13, Electromagnetic compatibility (EMC) – Part 4-13: Testing and measurement

techniques – Harmonics and interharmonics including mains signalling at a.c. power port, low

frequency immunity tests
IEC 61000-4-16:2015, Electromagnetic compatibility (EMC) – Part 4-16 Testing and

measurement techniques – Test for immunity to conducted, common mode disturbances in the

frequency range 0 Hz to 150 kHz

IEC 61000-4-17:1999, Electromagnetic compatibility (EMC) – Part 4-17: Testing and

measurement techniques – Ripple on d.c. input power port immunity test
IEC 61000-4-17:1999/AMD1:2001
...

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