SIST EN 61557-12:2008

Electrical safety in low voltage distribution systems up to 1 000 V a.c. and 1 500 V d.c. - Equipment for testing, measuring or monitoring of protective measures -- Part 12: Performance measuring and monitoring devices (PMD)

This part of IEC 61557 specifies requirements for combined performance measuring and monitoring devices that measure and monitor the electrical parameters within electrical distribution systems. These requirements also define the performance, in single and threephase a.c. or d.c. systems having rated voltages up to 1 000 V a.c. or up to 1 500 V d.c. These devices are fixed installed or portable. They are intended to be used indoors and/or outdoors. This standard is not applicable for: electricity metering equipment that complies with IEC 62053-21, IEC 62053-22 and IEC 62053-23. Nevertheless, uncertainties defined in this standard for active and reactive energy measurement are derived from those defined in the IEC 62053 standards series. simple remote relays or simple monitoring relays.

Elektrische Sicherheit in Niederspannungsnetzen bis AC 1 000 V und DC 1 500 V - Geräte zum Prüfen, Messen oder Überwachen von Schutzmaßnahmen - Teil 12: Kombinierte Geräte zur Messung und Überwachung des Betriebsverhaltens

Sécurité électrique dans les réseaux de distribution basse tension de 1 000 V c.a. et 1 500 V c.c. - Dispositifs de contrôle, de mesure ou de surveillance de mesures de protection -- Partie 12: Dispositifs de mesure et de surveillance des performances (PMD)

Spécifie des exigences pour les dispositifs combinés de mesure et de surveillance des performances, qui mesurent et surveillent les paramètres électriques dans les réseaux de distribution électrique. Ces exigences définissent également les performances, dans les réseaux alternatifs ou continus monophasés et triphasés, ayant des tensions assignées inférieures ou égales à 1 000 V en courant alternatif ou inférieures ou égales à 1 500 V en courant continu. Ces dispositifs sont installés de manière fixe ou portables. Ils sont destinés à être utilisés à l'intérieur et/ou à l'extérieur. Cette norme n'est pas applicable: - aux appareils de comptage d'électricité qui sont conformes à la CEI 62053-21, la CEI 62053-22 et la CEI 62053-23. Néanmoins, les incertitudes définies dans la présente norme pour la mesure de l'énergie active et réactive sont tirées de celles définies dans la série de normes CEI 62053. - aux relais à distance simples ou aux relais de surveillance simples. La présente norme est destinée à être utilisée conjointement avec la CEI 61557-1 (sauf spécification contraire), qui spécifie les exigences générales pour les appareils de mesure et de surveillance, tel qu'il est exigé dans la CEI 60364-6. La norme n'inclut pas la mesure et la surveillance des paramètres électriques définis dans les Parties 2 à 9 de la CEI 61557 ou dans la CEI 62020. Les dispositifs combinés de mesure et de surveillance des performances (PMD), tels que définis dans la présente norme, donnent des informations supplémentaires sur la sécurité, ce qui contribue à la vérification de l'installation et augmente les performances des réseaux de distribution. Par exemple, ces dispositifs aident à vérifier si le niveau des harmoniques est toujours compatible avec les canalisations électriques, tel qu'exigé dans la CEI 60364-5-52. Ces dispositifs combinés de mesure et de surveillance des performances des paramètres électriques, décrits dans la présente norme, sont utilisés pour des applications industrielles et commerciales générales. Un PMD-A est un PMD spécifique, conforme aux exigences de la CEI 61000-4-30, classe A, qui peut être utilisé dans les applications d''évaluation de la qualité de l'alimentation.

Električna varnost v nizkonapetostnih razdelilnih sistemih izmenične napetosti do 1 kV in enosmerne napetosti do 1,5 kV - Oprema za preskušanje, merjenje ali nadzorovanje zaščitnih ukrepov - 12. del: Naprave za merjenje in nadzorovanje lastnosti/parametrov električnih omrežij (IEC 61557-12:2007)

General Information

• Status: Published
• Publication Date: 31-Jul-2008
• ICS: 17.220.20 - Measurement of electrical and magnetic quantities
• ICS: 29.080.01 - Electrical insulation in general
• ICS: 29.240.01 - Power transmission and distribution networks in general
• Technical Committee: MOV - Measuring equipment for electromagnetic quantities
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 03-Jul-2008
• Due Date: 07-Sep-2008
• Completion Date: 01-Aug-2008
• Directive: 2004/108/EU - DIRECTIVE 2004/108/EC OF THE EUROPEAN PARLIAMENT AND OF THE COUNCIL of 15 December 2004 on the approximation of the laws of the Member States relating to electromagnetic compatibility and repealing Directive 89/336/EEC
• Directive: 2006/95/EC - Directive 2006/95/EC of the European Parliament and of the Council of 12 December 2006 on the harmonisation of the laws of Member States relating to electrical equipment designed for use within certain voltage limits (codified version)
• Directive: 2014/30/EU - Directive 2014/30/EU of the European Parliament and of the Council of 26 February 2014 on the harmonisation of the laws of the Member States relating to electromagnetic compatibility (recast)
• Directive: 2014/35/EU - Directive 2014/35/EU of the European Parliament and of the Council of 26 February 2014 on the harmonisation of the laws of the Member States relating to the making available on the market of electrical equipment designed for use within certain voltage limits
• Ref Project: EN 61557-12:2008 - Electrical safety in low voltage distribution systems up to 1 000 V a.c. and 1 500 V d.c. - Equipment for testing, measuring or monitoring of protective measures - Part 12: Performance measuring and monitoring devices (PMD)

Relations

• Replaced By: SIST EN IEC 61557-12:2022 - Electrical safety in low voltage distribution systems up to 1 000 V a.c. and 1 500 V d.c. - Equipment for testing, measuring or monitoring of protective measures - Part 12: Power metering and monitoring devices (PMD) (IEC 61557-12:2018)
• Effective Date: 11-Jan-2022
• Replaced By: SIST EN IEC 61557-12:2022 - Electrical safety in low voltage distribution systems up to 1 000 V a.c. and 1 500 V d.c. - Equipment for testing, measuring or monitoring of protective measures - Part 12: Power metering and monitoring devices (PMD) (IEC 61557-12:2018)
• Effective Date: 07-Jun-2022
• Revised: SIST EN IEC 61557-12:2022 - Electrical safety in low voltage distribution systems up to 1 000 V a.c. and 1 500 V d.c. - Equipment for testing, measuring or monitoring of protective measures - Part 12: Power metering and monitoring devices (PMD) (IEC 61557-12:2018)
• Effective Date: 03-May-2016

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN 61557-12:2008
01-september-2008
(OHNWULþQDYDUQRVWYQL]NRQDSHWRVWQLKUD]GHOLOQLKVLVWHPLKL]PHQLþQHQDSHWRVWLGR
N9LQHQRVPHUQHQDSHWRVWLGRN92SUHPD]DSUHVNXãDQMHPHUMHQMHDOL
QDG]RURYDQMH]DãþLWQLKXNUHSRYGHO1DSUDYH]DPHUMHQMHLQQDG]RURYDQMH
ODVWQRVWLSDUDPHWURYHOHNWULþQLKRPUHåLM,(&
Electrical safety in low voltage distribution systems up to 1 000 V a.c. and 1 500 V d.c. -
Equipment for testing, measuring or monitoring of protective measures -- Part 12:
Combined performance measuring and monitoring devices for electrical parameters
Elektrische Sicherheit in Niederspannungsnetzen bis AC 1 000 V und DC 1 500 V -
Geräte zum Prüfen, Messen oder Überwachen von Schutzmaßnahmen - Teil 12:
Kombinierte Geräte zur Messung und Überwachung des Betriebsverhaltens
Sécurité électrique dans les réseaux de distribution basse tension de 1 000 V c.a. et 1
500 V c.c. - Dispositifs de contrôle, de mesure ou de surveillance de mesures de
protection - Partie 12: Dispositifs de mesure et de surveillance des performances (PMD)
Ta slovenski standard je istoveten z: EN 61557-12:2008
ICS:
17.220.20 0HUMHQMHHOHNWULþQLKLQ Measurement of electrical
PDJQHWQLKYHOLþLQ and magnetic quantities
29.080.01 (OHNWULþQDL]RODFLMDQD Electrical insulation in
VSORãQR general
29.240.01 2PUHåMD]DSUHQRVLQ Power transmission and
GLVWULEXFLMRHOHNWULþQHHQHUJLMH distribution networks in
QDVSORãQR general
SIST EN 61557-12:2008 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 61557-12:2008

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SIST EN 61557-12:2008

EUROPEAN STANDARD
EN 61557-12

NORME EUROPÉENNE
May 2008
EUROPÄISCHE NORM

ICS 17.220.20; 29.080.01; 29.240.01


English version


Electrical safety in low voltage distribution systems
up to 1 000 V a.c. and 1 500 V d.c. -
Equipment for testing, measuring or monitoring of protective measures -
Part 12: Performance measuring and monitoring devices (PMD)
(IEC 61557-12:2007)


Sécurité électrique dans les réseaux  Elektrische Sicherheit
de distribution basse tension in Niederspannungsnetzen
de 1 000 V c.a. et 1 500 V c.c. - bis AC 1 000 V und DC 1 500 V -
Dispositifs de contrôle, de mesure ou Geräte zum Prüfen, Messen oder
de surveillance de mesures de protection - Überwachen von Schutzmaßnahmen -
Partie 12: Dispositifs de mesure et Teil 12: Kombinierte Geräte zur Messung
de surveillance des performances (PMD) und Überwachung des Betriebsverhaltens
(CEI 61557-12:2007) (IEC 61557-12:2007)




This European Standard was approved by CENELEC on 2008-04-01. CENELEC members are bound to comply
with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard
the status of a national standard without any alteration.

Up-to-date lists and bibliographical references concerning such national standards may be obtained on
application to the Central Secretariat or to any CENELEC member.

This European Standard exists in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CENELEC member into its own language and notified
to the Central Secretariat has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Cyprus, the
Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Central Secretariat: rue de Stassart 35, B - 1050 Brussels


© 2008 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 61557-12:2008 E

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SIST EN 61557-12:2008
EN 61557-12:2008 - 2 -
Foreword
The text of document 85/311/FDIS, future edition 1 of IEC 61557-12, prepared by IEC TC 85, Measuring
equipment for electrical and electromagnetic quantities, was submitted to the IEC-CENELEC parallel vote
and was approved by CENELEC as EN 61557-12 on 2008-04-01.
This standard is to be used in conjunction with EN 61557-1:2007 (unless otherwise specified).
The following dates were fixed:

– latest date by which the EN has to be implemented

at national level by publication of an identical
(dop) 2009-01-01
national standard or by endorsement

– latest date by which the national standards conflicting
(dow) 2011-04-01
with the EN have to be withdrawn
This European Standard has been prepared under a mandate given to CENELEC by the European
Commission and the European Free Trade Association and covers essential requirements of
EC Directive 2004/108/EC. See Annex ZZ.
Annexes ZA and ZZ have been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 61557-12:2007 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standards indicated:
IEC 60044-1 NOTE  Harmonized as EN 60044-1:1999 (modified).
IEC 60044-2 NOTE  Harmonized as EN 60044-2:1999 (modified).
IEC 60044-7 NOTE  Harmonized as EN 60044-7:2000 (not modified).
IEC 60044-8 NOTE  Harmonized as EN 60044-8:2002 (not modified).
IEC 60071-1 NOTE  Harmonized as EN 60071-1:2006 (not modified).
IEC 60359 NOTE  Harmonized as EN 60359:2002 (not modified).
IEC 61000-4-7 NOTE  Harmonized as EN 61000-4-7:2002 (not modified).
IEC 61140 NOTE  Harmonized as EN 61140:2002 (not modified).
IEC 62052-11 NOTE  Harmonized as EN 62052-11:2003 (not modified).
__________

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SIST EN 61557-12:2008
- 3 - EN 61557-12:2008

Annex ZA
(normative)

Normative references to international publications
with their corresponding European publications

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.

NOTE  When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD
applies.

Publication Year Title EN/HD Year

1) 2)
IEC 60068-2-1 - Environmental testing - EN 60068-2-1 2007
Part 2-1: Tests - Test A: Cold


1) 2)
IEC 60068-2-2 - Environmental testing - EN 60068-2-2 2007
Part 2-2: Tests - Test B: Dry heat


1) 2)
IEC 60068-2-30 - Environmental testing - EN 60068-2-30 2005
Part 2-30: Tests - Test Db: Damp heat, cyclic
(12 h + 12 h cycle)


1) 2)
IEC 60364-6 (mod) - Low voltage electrical installations - HD 60364-6 2007
Part 6: Verification


1) 2)
IEC 60529 - Degrees of protection provided by enclosures EN 60529 1991
(IP Code) + corr. May 1993


1) 2)
IEC 61000-4-5 - Electromagnetic compatibility (EMC) - EN 61000-4-5 2006
Part 4-5: Testing and measurement
techniques - Surge immunity test


1) 2)
IEC 61000-4-15 - Electromagnetic compatibility (EMC) - EN 61000-4-15 1998
Part 4-15: Testing and measurement
techniques - Flickermeter - Functional and
design specifications


IEC 61000-4-30 2003 Electromagnetic compatibility (EMC) - EN 61000-4-30 2003
Part 4-30: Testing and measurement
techniques - Power quality measurement
methods


IEC 61010 Series Safety requirements for electrical equipment EN 61010 Series
for measurement, control, and laboratory use


IEC 61010-1 2001 Safety requirements for electrical equipment EN 61010-1 2001
for measurement, control, and laboratory + corr. June 2002
use -
Part 1: General requirements


IEC 61326-1 2005 Electrical equipment for measurement, control EN 61326-1 2006
and laboratory use - EMC requirements -
Part 1: General requirements


IEC 61557-1 2007 Electrical safety in low voltage distribution EN 61557-1 2007
systems up to 1 000 V a.c. and 1 500 V d.c. -
Equipment for testing, measuring or
monitoring of protective measures -
Part 1: General requirements



1)
Undated reference.
2)
Valid edition at date of issue.

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SIST EN 61557-12:2008
EN 61557-12:2008 - 4 -
Publication Year Title EN/HD Year

IEC 62053-21 2003 Electricity metering equipment (a.c.) - EN 62053-21 2003
Particular requirements -
Part 21: Static meters for active energy
(classes 1 and 2)


IEC 62053-22 2003 Electricity metering equipment (a.c.) - EN 62053-22 2003
Particular requirements -
Part 22: Static meters for active energy
(classes 0,2 S and 0,5 S)


IEC 62053-23 2003 Electricity metering equipment (a.c.) - EN 62053-23 2003
Particular requirements -
Part 23: Static meters for reactive energy
(classes 2 and 3)


IEC 62053-31 1998 Electricity metering equipment (a.c.) - EN 62053-31 1998
Particular requirements -
Part 31: Pulse output devices for
electromechanical and electronic meters (two
wires only)

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SIST EN 61557-12:2008
- 5 - EN 61557-12:2008
Annex ZZ
(informative)

Coverage of Essential Requirements of EC Directives
This European Standard has been prepared under a mandate given to CENELEC by the European
Commission and the European Free Trade Association and within its scope the standard covers all
relevant essential requirements as given in Annex I of the EC Directive 2004/108/EC.
Compliance with this standard provides one means of conformity with the specified essential
requirements of the Directive concerned.
WARNING: Other requirements and other EC Directives may be applicable to the products falling within
the scope of this standard.
__________

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SIST EN 61557-12:2008

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SIST EN 61557-12:2008
IEC 61557-12
Edition 1.0 2007-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Electrical safety in low voltage distribution systems up to 1 000 V a.c. and
1 500 V d.c. – Equipment for testing, measuring or monitoring of protective
measures –
Part 12: Performance measuring and monitoring devices (PMD)

Sécurité électrique dans les réseaux de distribution basse tension
de 1 000 V c.a. et 1 500 V c.c. – Dispositifs de contrôle, de mesure ou
de surveillance de mesures de protection –
Partie 12: Dispositifs de mesure et de surveillance des performances (PMD)

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
XC
CODE PRIX
ICS 17.220.20; 29.080.01; 29.240.01 ISBN 2-8318-9243.0

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SIST EN 61557-12:2008
– 2 – 61557-12 © IEC:2007
CONTENTS

FOREWORD.6
INTRODUCTION.8

1 Scope.9
2 Normative references .10
3 Terms and definitions .11
3.1 General definitions .11
3.2 Definitions related to uncertainty and performance .12
3.3 Definitions related to electric phenomena .15
3.4 Definitions related to measurement techniques .18
3.5 Notations.18
3.5.1 Functions .18
3.5.2 Symbols and abbreviations.19
3.5.3 Indices .19
4 Requirements .19
4.1 General requirements.19
4.2 PMD general architecture .20
4.3 Classification of PMD .20
4.4 List of applicable performance classes .21
4.4.1 List of applicable function performance classes for PMD without
external sensors .21
4.4.2 List of applicable system performance classes for PMD with
external sensors .22
4.5 Operating and reference conditions for PMD .22
4.5.1 Reference conditions.22
4.5.2 Rated operating conditions .22
4.6 Start-up conditions .24
4.7 Requirements for PMD functions (except PMD-A).24
4.7.1 Active power (P) and active energy (E ) measurements .24
a
4.7.2 Reactive power (Q , Q ) and reactive energy (E , E ) measurements .29
A V rA rV
4.7.3 Apparent power (S , S ) and apparent energy (E , E )
A V apA apV
measurements.32
4.7.4 Frequency (f) measurements .34
4.7.5 R.m.s. phase current (I) and neutral current (I , I ) measurements.35
N Nc
4.7.6 R.m.s. voltage (U) measurements.38
4.7.7 Power factor (PF , PF ) measurements .40
A V
4.7.8 Short term flicker (P ) and long term flicker (P ) measurements.40
st lt
4.7.9 Voltage dip (U ) and voltage swell (U ) measurements .41
dip swl
4.7.10 Transients overvoltage (U ) measurements .43
tr
4.7.11 Voltage interruption (U ) measurements.43
int
4.7.12 Voltage unbalance (U , U ) measurements .44
nb nba
4.7.13 Voltage harmonics (U ) and voltage THD (THD and THD-R )
h u u
measurements.45

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SIST EN 61557-12:2008
61557-12 © IEC:2007 – 3 –
4.7.14 Current harmonics (I ) and current THD (THD and THD-R )
h i i
measurements.46
4.7.15 Minimum, maximum, peak, three-phases average and demand
measurements.47
4.8 Requirements for PMD-A functions.47
4.9 General mechanical requirements .48
4.9.1 Vibration requirements .48
4.9.2 IP requirements .48
4.10 Safety requirements .49
4.10.1 Clearances and creepage distances .49
4.10.2 Connection of a fixed installed PMD with a current transformer .49
4.10.3 Connection of a PMD with a high voltage sensor .49
4.10.4 Accessible parts .49
4.10.5 Hazardous live parts.50
4.11 Analog outputs .50
4.11.1 General requirements .50
4.11.2 Compliance voltage .50
4.11.3 Analog output ripple content .50
4.11.4 Analog output response time .50
4.11.5 Limiting value of the analog output signal .50
4.11.6 Pulse outputs .51
5 Marking and operating instructions .51
5.1 Marking .51
5.2 Operating and installation instructions.51
5.2.1 General characteristics.51
5.2.2 Essential characteristics .52
5.2.3 Safety characteristics .54
6 Tests .54
6.1 Type tests of PMD.54
6.1.1 Test of temperature influence .55
6.1.2 Active power.55
6.1.3 Apparent power .58
6.1.4 Power factor .58
6.1.5 Common mode voltage rejection test .58
6.1.6 Frequency .59
6.1.7 Measurement of voltage harmonics .59
6.1.8 Measurement of current harmonics.59
6.1.9 Dips and swells .60
6.1.10 Voltage interruptions .60
6.1.11 Outputs tests .60
6.1.12 Climatic tests.61
6.1.13 EMC tests.62
6.1.14 Start up tests.62
6.2 Type tests of PMD-A .62
6.3 Routine tests .62
6.3.1 Protective bonding test .62
6.3.2 Dielectric strength test.63
6.3.3 Uncertainty test .63

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SIST EN 61557-12:2008
– 4 – 61557-12 © IEC:2007
Annex A (informative) Definitions of electrical parameters .64
Annex B (normative) Definitions of minimum, maximum, peak and demand values .68
Annex C (informative) Intrinsic uncertainty, operating uncertainty, and overall system
uncertainty.70
Annex D (informative) Recommended sensor classes for the different kinds of PMD.72
Annex E (normative) Requirements applicable to PMD and to PMD-A.75

Bibliography.76

Figure 1 – PMD generic measurement chain.20
Figure 2 – Description of different types of PMD .21
Figure 3 – Relationship between ambient air temperature and relative humidity.24
Figure 4 – Waveform for odd harmonics influence test on active power measurement .55
Figure 5 – Spectral content for odd harmonics influence test on active power measurement .56
Figure 6 – Waveform for sub-harmonics influence test on active power measurement .57
Figure 7 – Spectral content for sub-harmonics influence test on active power measurement .57
Figure 8 – Common mode voltage influence testing .58
Figure 9 – Waveform for harmonics influence test on frequency measurement.59
Figure A.1 – Arithmetic and vector apparent powers in sinusoidal situation.66
Figure A.2 – Geometric representation of active and reactive power .67
Figure B.1 – Thermal current demand.68
Figure C.1 – Different kind of uncertainties .70

Table 1 – Classification of PMD .21
Table 2 – List of applicable function performance classes for PMD without external sensors 21
Table 3 – List of applicable system performance classes for PMD with external sensors.22
Table 4 – Reference conditions for testing .22
Table 5 – Rated operating temperatures for portable equipment .23
Table 6 – Rated operating temperatures for fixed installed equipment .23
Table 7 – Humidity and altitude operating conditions .23
Table 8 – Intrinsic uncertainty table for active power and active energy measurement .25
Table 9 – Influence quantities for active power and active energy measurement.26
Table 10 – Starting current for active power and active energy measurement .29
Table 11 – Intrinsic uncertainty table for reactive power and reactive energy measurement .29
Table 12 – Influence quantities for reactive power and reactive energy measurement.30
Table 13 – Starting current for reactive energy measurement .32
Table 14 – Intrinsic uncertainty table for apparent power and apparent
energy measurement .32
Table 15 – Influence quantities for apparent power and apparent energy measurement .33
Table 16 – Intrinsic uncertainty table for frequency measurement .34
Table 17 – Influence quantities for frequency measurement.34
Table 18 – Rated range of operation for phase current measurement .35
Table 19 – Rated range of operation for neutral current measurement .35

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SIST EN 61557-12:2008
61557-12 © IEC:2007 – 5 –
Table 20 – Intrinsic uncertainty table for phase current .36
Table 21 – Intrinsic uncertainty table for neutral current measurement.36
Table 22 – Intrinsic uncertainty table for neutral current calculation .36
Table 23 – Influence quantities for phase current and neutral current measurement .37
Table 24 – Rated range of operation for r.m.s. voltage measurement.38
Table 25 – Intrinsic uncertainty table for r.m.s. voltage measurement .38
Table 26 – Influence quantities for r.m.s. voltage measurement .39
Table 27 – Intrinsic uncertainty table for power factor measurement .40
Table 28 – Intrinsic uncertainty table for flicker measurement .40
Table 29 – Rated range of operation for voltage dips and swells measurement.41
Table 30 – Intrinsic uncertainty table for voltage dips and swells measurement .41
Table 31 – Influence quantities for dips and swells measurement .42
Table 32 – Intrinsic uncertainty table for transient overvoltage measurement.43
Table 33 – Intrinsic uncertainty table for voltage interruption measurement .44
Table 34 – Intrinsic uncertainty table for voltage unbalance measurement .44
Table 35 – Rated range of operation for voltage harmonics measurement .45
Table 36 – Intrinsic uncertainty table for voltage harmonics measurement .45
Table 37 – Intrinsic uncertainty table for voltage THD or THD-R measurement .45
u u
Table 38 – Rated range of operation for current harmonics measurement.46
Table 39 – Intrinsic uncertainty table for current harmonics measurement .46
Table 40 – Intrinsic uncertainty table for current THD and THD-R measurement .47
i i
Table 41 – Complementary characteristics of PMD-A.48
Table 42 – Minimum IP requirements for PMD .49
Table 43 – PMD specification form.52
Table 44 – Characteristics specification template.53
Table 45 – Characteristics specification template.54
Table A.1 – Symbols definition.64
Table A.2 – Calculation definitions of electrical parameters, for 3 phase unbalanced
system with neutral .65
Table D.1 – PMD SD associated to current sensor or PMD DS associated to voltage
sensor .72
Table D.2 – PMD SS with Current Sensor and Voltage Sensor association .73
Table D.3 – Range of applicable performance classes for PMD without its associated
external sensors .74
Table D.4 – Range of applicable performance classes when calculating performance class of
PMD with its associated external sensors .74
Table D.5 – List of functions affected by uncertainty of external sensors.74
Table E.1 – Requirements applicable to PMD and to PMD-A.
...