IEC 61869-13:2021

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

IEC 61869-13:2021

Name:IEC 61869-13:2021   Standard name:Instrument transformers - Part 13: Stand-alone merging unit (SAMU)
Standard number:IEC 61869-13:2021   language:English and French language
Release Date:02-Feb-2021   technical committee:TC 38 - Instrument Transformers
Drafting committee:WG 37 - TC 38/WG 37   ICS number:17.220.20 - Measurement of electrical and magnetic quantities

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)





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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

– 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
I
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

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

– 4 – IEC 61869-13:2021 © IEC 2021
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
INSTRUMENT TRANSFORMERS –
Part 13: Stand
...

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