SIST EN 62040-3:2011

SLOVENSKI STANDARD
01-september-2011
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Uninterruptible power systems (UPS) - Part 3: Method of specifying the performance and
test requirements
Unterbrechungsfreie Stromversorgungssysteme (USV) -- Teil 3: Methoden zum
Festlegen der Leistungs- und Prüfungsanforderungen
Alimentations sans interruption (ASI) - Partie 3: Méthode de spécification des
performances et exigences d'essai
Ta slovenski standard je istoveten z: EN 62040-3:2011
ICS:
29.200 8VPHUQLNL3UHWYRUQLNL Rectifiers. Convertors.
6WDELOL]LUDQRHOHNWULþQR Stabilized power supply
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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 62040-3
NORME EUROPÉENNE
June 2011
EUROPÄISCHE NORM
ICS 29.200 Supersedes EN 62040-3:2001 + A11:2009

English version
Uninterruptible power systems (UPS) -
Part 3: Method of specifying the performance and test requirements
(IEC 62040-3:2011)
Alimentations sans interruption (ASI) -  Unterbrechungsfreie
Partie 3: Méthode de spécification des Stromversorgungssysteme (USV) -
performances et exigences d'essais Teil 3: Methoden zum Festlegen der
(CEI 62040-3:2011) Leistungs- und Prüfungsanforderungen
(IEC 62040-3:2011)
This European Standard was approved by CENELEC on 2011-04-18. 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, Croatia, 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

Management Centre: Avenue Marnix 17, B - 1000 Brussels

© 2011 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 62040-3:2011 E
Foreword
The text of document 22H/129/FDIS, future edition 2 of IEC 62040-3, prepared by SC 22H,
Uninterruptible power systems (UPS), of IEC TC 22, Power electronic systems and equipment, was
submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 62040-3 on
2011-04-18.
This European Standard supersedes EN 62040-3:2001 + A11:2009.
The significant technical changes are:
– reference test load – definition and application revised (3.3.5 and 6.1.1.3);
– test schedule – presented as a single table grouped by revised type and routine tests (see 6.1.6,
Table 3);
– dynamic output voltage performance characteristics – guidance to measure – addition (Annex H);
– UPS efficiency – requirements and methods of measure – addition (Annexes I and J);
– functional availability – guidance for UPS reliability integrity level classification – addition (Annex K).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN and CENELEC shall not be held responsible for identifying any or all such patent
rights.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2012-01-18
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2014-04-18
In this standard, the following print types are used:
– requirements proper and normative annexes: in roman type;
– compliance statements and test specifications: in italic type;
– notes and other informative matter: in smaller roman type;
– normative conditions within tables: in smaller roman type;
– terms that are defined in Clause 3: bold.
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 62040-3:2011 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 60034-22 NOTE  Harmonized as EN 60034-22.
IEC 60068-1:1988 NOTE  Harmonized as EN 60068-1:1994 (not modified).

- 3 - EN 62040-3:2011
IEC 60068-2 series NOTE  Harmonized in EN 60068-2 series (not modified).
IEC 60068-3-3:1991 NOTE  Harmonized as EN 60068-3-3:1993 (not modified).
IEC 60146-1-3:1991 NOTE  Harmonized as EN 60146-1-3:1993 (not modified).
IEC 60664-1:2007 NOTE  Harmonized as EN 60664-1:2007 (not modified).
IEC/TR 61508 series NOTE  Harmonized in EN 61508 series (not modified).
__________
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

IEC 60038 - IEC standard voltages FprEN 60038 -

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

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

IEC 60068-2-27 - Environmental testing - EN 60068-2-27 -
Part 2-27: Tests - Test Ea and guidance:
Shock
IEC 60068-2-31 2008 Environmental testing - EN 60068-2-31 2008
Part 2-31: Tests - Test Ec: Rough handling
shocks, primarily for equipment-type
specimens
IEC 60068-2-78 - Environmental testing - EN 60068-2-78 -
Part 2-78: Tests - Test Cab: Damp heat,
steady state
IEC 60146-1-1 2009 Semiconductor converters - General EN 60146-1-1 2010
requirements and line commutated converters -
Part 1-1: Specification of basic requirements

IEC 60146-2 1999 Semiconductor converters - EN 60146-2 2000
Part 2: Self-commutated semiconductor
converters including direct d.c. converters

IEC 60196 - IEC standard frequencies EN 60196 -

IEC 60364-1 - Low-voltage electrical installations - HD 60364-1 -
Part 1: Fundamental principles, assessment of
general characteristics, definitions

IEC 60364-5-52 - Low-voltage electrical installations - HD 60364-5-52 -
Part 5-52: Selection and erection of electrical
equipment - Wiring systems
IEC 60947-3 - Low-voltage switchgear and controlgear - EN 60947-3 -
Part 3: Switches, disconnectors, switch-
disconnectors and fuse-combination units

IEC 60947-6-1 - Low-voltage switchgear and controlgear - EN 60947-6-1 -
Part 6-1: Multiple function equipment -
Transfer switching equipment
At draft stage.
- 5 - EN 62040-3:2011
Publication Year Title EN/HD Year
IEC 60950-1 - Information technology equipment - Safety - EN 60950-1 -
Part 1: General requirements
IEC 60990 - Methods of measurement of touch current and EN 60990 -
protective conductor current
IEC 61000-2-2 2002 Electromagnetic compatibility (EMC) - EN 61000-2-2 2002
Part 2-2: Environment - Compatibility levels
for low-frequency conducted disturbances and
signalling in public low-voltage power supply
systems
IEC 61000-3-2 - Electromagnetic compatibility (EMC) - EN 61000-3-2 -
Part 3-2: Limits - Limits for harmonic current
emissions (equipment input current ≤ 16 A per
phase)
IEC/TS 61000-3-4 - Electromagnetic compatibility (EMC) - - -
Part 3-4: Limits - Limitation of emission of
harmonic currents in low-voltage power supply
systems for equipment with rated current
greater than 16 A
IEC 61000-3-12 - Electromagnetic compatibility (EMC) - EN 61000-3-12 -
Part 3-12: Limits - Limits for harmonic currents
produced by equipment connected to public
low-voltage systems with input current > 16 A
and ≤ 75 A per phase
IEC 61000-4-30 - Electromagnetic compatibility (EMC) - EN 61000-4-30 -
Part 4-30 : Testing and measurement
techniques - Power quality measurement
methods
IEC 61672-1 - Electroacoustics - Sound level meters - EN 61672-1 -
Part 1: Specifications
IEC 62040-1 2008 Uninterruptible Power Systems (UPS) - EN 62040-1 2008
+ corr. September 2008 Part 1: General and safety requirements for + corr. February 2009
UPS
IEC 62040-2 - Uninterruptible power systems (UPS) - EN 62040-2 -
Part 2: Electromagnetic compatibility (EMC)
requirements
IEC 62310-3 2008 Static transfer systems (STS) - EN 62310-3 2008
Part 3: Method for specifying performance and
test requirements
ISO 7779 2010 Acoustics - Measurement of airborne noise EN ISO 7779 2010
emitted by information technology and
telecommunications equipment
IEC 62040-3 ®
Edition 2.0 2011-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Uninterruptible power systems (UPS) –
Part 3: Method of specifying the performance and test requirements

Alimentations sans interruption (ASI) –
Partie 3: Méthode de spécification des performances et exigences d’essais

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX XE
ICS 29.200 ISBN 978-2-88912-384-1

– 2 – 62040-3  IEC:2011
CONTENTS
FOREWORD . 6
1 Scope . 8
2 Normative references . 9
3 Terms and definitions . 10
3.1 Systems and components . 10
3.2 Performance of systems and components . 14
3.3 Specified values‒ General . 18
3.4 Input values. 22
3.5 Output values . 24
4 Environmental conditions . 26
4.1 Introduction . 26
4.2 Normal conditions . 26
4.2.1 Operation . 26
4.2.2 Storage and transportation . 27
4.3 Unusual conditions . 28
4.3.1 Introduction . 28
4.3.2 Operation . 28
4.3.3 Storage and transportation . 28
5 Electrical conditions, performance and declared values . 28
5.1 General . 28
5.1.1 UPS configuration. 28
5.1.2 Markings and instructions . 29
5.1.3 Safety . 29
5.1.4 Electromagnetic compatibility . 29
5.2 UPS input specification . 29
5.2.1 Conditions for normal mode operation . 29
5.2.2 Characteristics to be declared by the manufacturer . 30
5.2.3 Characteristics and conditions to be identified by the purchaser . 30
5.3 UPS output specification . 31
5.3.1 Conditions for the UPS to supply a load . 31
5.3.2 Characteristics to be declared by the manufacturer . 31
5.3.3 Characteristics and conditions to be identified by the purchaser . 32
5.3.4 Performance classification . 32
5.4 Stored energy specification . 37
5.4.1 General . 37
5.4.2 Battery . 37
5.5 UPS switch specification . 38
5.6 Communication circuits . 38
6 UPS tests . 39
6.1 Summary . 39
6.1.1 Venue, instrumentation and load . 39
6.1.2 Routine test . 40
6.1.3 Site test . 40
6.1.4 Witness test. 40
6.1.5 Type test . 40
6.1.6 Schedule of tests . 40

62040-3  IEC:2011 – 3 –
6.2 Routine test procedure . 42
6.2.1 Environmental . 42
6.2.2 Electrical . 42
6.3 Site test procedure . 44
6.4 Type test procedure (electrical) . 44
6.4.1 Input – a.c. supply compatibility . 44
6.4.2 Output – Linear load . 47
6.4.3 Output – Non-linear load. 52
6.4.4 Stored and restored energy . 54
6.5 Type test procedure (environmental) . 55
6.5.1 Environmental and transportation test methods . 55
6.5.2 Transportation . 55
6.5.3 Storage . 56
6.5.4 Operation . 57
6.5.5 Acoustic noise . 57
6.6 UPS functional unit tests (where not tested as a complete UPS) . 58
6.6.1 UPS rectifier tests . 58
6.6.2 UPS inverter tests . 58
6.6.3 UPS switch tests . 58
6.6.4 Stored energy / battery tests . 58
Annex A (informative) Uninterruptible power system (UPS) configurations . 59
Annex B (informative) Topologies – Uninterruptible power system (UPS) . 65
Annex C (informative) UPS switch applications . 68
Annex D (informative) Purchaser specification guidelines . 74
Annex E (normative) Reference non-linear load . 81
Annex F (informative) Information on backfeed protection . 83
Annex G (normative) Input mains failure – Test method . 84
Annex H (informative) Dynamic output performance – Measurement techniques . 85
Annex I (informative) UPS Efficiency values . 87
Annex J (normative) UPS efficiency – Methods of measurement . 96
Annex K (informative) UPS functional availability . 99
Bibliography . 102

Figure 1 – Typical “non-sinusoidal” output voltage waveform . 34
Figure 2 – Curve 1 – Dynamic output performance classification 1 . 35
Figure 3 – Curve 2 – Dynamic output performance classification 2 . 36
Figure 4 – Curve 3 – Dynamic output performance classification 3 . 36
Figure 5 – Linear load test method . 51
Figure 6 – Reference non-linear load test method . 53
Figure A.1 – Single UPS – Basic . 60
Figure A.2 – Single UPS with bypass . 60
Figure A.3 – Parallel UPS with common bypass . 61
Figure A.4 – Parallel UPS with distributed bypass . 62
Figure A.5 – Stand-by redundant UPS . 63
Figure A.6 – Dual bus UPS . 63

– 4 – 62040-3  IEC:2011
Figure A.7 – Stand-by redundant dual bus UPS . 64
Figure B.1 – Double conversion topology . 65
Figure B.2 – Line-interactive topology . 66
Figure B.3 – Stand-by topology . 67
Figure C.1 – UPS interrupter . 68
Figure C.2 – UPS interrupters in parallel UPS application . 68
Figure C.3 – UPS interrupters in split load application . 69
Figure C.4 – Bypass transfer switch . 69
Figure C.5 – Isolation of bypass transfer switch . 70
Figure C.6 – Isolation of interrupters . 70
Figure C.7 – Isolation switches with interrupter function . 71
Figure C.8 – Internal maintenance bypass switch . 71
Figure C.9 – External maintenance bypass switch . 71
Figure C.10 – Tie switch in dual bus application . 72
Figure C.11 – Tie switches in triple bus application . 72
Figure C.12 – Multiple function bypass, interrupter and isolation switch . 73
Figure E.1 – Reference non-linear load . 81
Figure G.1 – Connection of test circuit . 84
Figure H.1 – Example: instantaneous voltage variation in compliance with curve 1 of
Figure 2 . 86
Figure I.1 – Example of VFI-S stand-by allowance . 92
Figure I.2 – Example of VFI-S duty allowance . 93
Figure I.3 – Example of VFI-S stand-by and duty allowance . 94
Figure I.4 – Example of VFD duty allowance calculation . 95
Figure K.1 – Reliability % over time . 100
Figure K.2 – Maintainability % over time . 101

Table 1 – Power derating factors for use at altitudes above 1 000 m . 27
Table 2 – Compatibility levels for individual harmonic voltages in low voltage networks . 30
Table 3 – UPS test schedule . 40
Table 4 – Free fall testing . 56
Table D.1 – UPS technical data – Manufacturer’s declaration . 76
Table I.1 – Efficiency for UPS rated from 0,3 kVA to less than 10,0 kVA with
classification “VFI – S…" . 88
Table I.2 – Efficiency for UPS rated from 0,3 kVA to less than 10,0 kVA with
classification VI and VFI, except "VFI – S…” . 88
Table I.3 – Efficiency for UPS rated from 0,3 kVA to less than 10,0 kVA with
classification VFD . 89
Table I.4 – Efficiency for UPS rated from 10,0 kVA (inclusive) and above with
classification “VFI – S…" . 89
Table I.5 – Efficiency for UPS rated from 10,0 kVA (inclusive) and above with
classification VI and VFI, except "VFI – S…” . 90
Table I.6 – Efficiency for UPS rated from 10,0 kVA (inclusive) and above with
classification VFD . 90
Table I.7 – UPS efficiency allowances for input or output isolation transformer . 91

62040-3  IEC:2011 – 5 –
Table I.8 – UPS efficiency allowances for input harmonic current filtering . 91
Table K.1 – Reliability integrity levels for UPS . 99

– 6 – 62040-3  IEC:2011
INTERNATIONAL ELECTROTECHNICAL COMMISSION
_____________
UNINTERRUPTIBLE POWER SYSTEMS (UPS) –

Part 3: Method of specifying the performance and test requirements

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 in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
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 62040-3 has been prepared by subcommittee 22H: Uninterruptible
power systems (UPS), of IEC technical committee 22: Power electronic systems and
equipment.
This second edition cancels and replaces first edition published in 1999 and constitutes a
technical revision. The significant technical changes are:
– reference test load – definition and application revised (3.3.5 and 6.1.1.3);
– test schedule – presented as a single table grouped by revised type and routine tests (see
6.1.6, Table 3);
– dynamic output voltage performance characteristics – guidance to measure – addition
(Annex H);
– UPS efficiency – requirements and methods of measure – addition (Annexes I and J);
– functional availability – guidance for UPS reliability integrity level classification – addition
(Annex K).
62040-3  IEC:2011 – 7 –
The text of this standard is based on the following documents:
FDIS Report on voting
22H/129/FDIS 22H/133A/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
In this standard, the following print types are used:
– requirements proper and normative annexes: in roman type;
– compliance statements and test specifications: in italic type;
– notes and other informative matter: in smaller roman type;
– normative conditions within tables: in smaller roman type;
– terms that are defined in Clause 3: bold.
A list of all parts of the IEC 62040 series, under the general title: Uninterruptible power
systems (UPS) can be found on the IEC website.
The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
IMPORTANT – The 'colour inside' logo on the cover page of this publication 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.
– 8 – 62040-3  IEC:2011
UNINTERRUPTIBLE POWER SYSTEMS (UPS) –

Part 3: Method of specifying the performance and test requirements

1 Scope
This International Standard applies to movable, stationary and fixed electronic
uninterruptible power systems (UPS) that deliver single or three-phase fixed frequency a.c.
output voltage not exceeding 1 000 V a.c. and that incorporate an energy storage system,
generally connected through a d.c. link.
This standard is intended to specify performance and test requirements of a complete UPS
and not of individual UPS functional units. The individual UPS functional units are dealt with
in IEC publications referred to in the bibliography that apply so far that they are not in
contradiction with this standard.
The primary function of the UPS covered by this standard is to ensure continuity of an a.c.
power source. The UPS may also serve to improve the quality of the power source by keeping
it within specified characteristics. UPS have been developed over a wide range of power, from
less than hundred watts to several megawatts, to meet requirements for availability and
quality of power to a variety of loads. Refer to Annexes A and B for information on typical
UPS configurations and topologies.
This standard also covers UPS test and performance when power switches form integral part
of a UPS and are associated with its output. Included are interrupters, bypass switches,
isolating switches, and tie switches. These switches interact with other functional units of the
UPS to maintain continuity of load power.
This standard does not cover
– conventional a.c. input and output distribution boards or d.c. boards and their
associated switches (e.g. switches for batteries, rectifier output or inverter input);
– stand-alone static transfer systems covered by IEC 62310-3;
– systems wherein the output voltage is derived from a rotating machine.
NOTE 1 This standard recognises that power availability to information technology (IT) equipment represents a
major UPS application. The UPS output characteristics specified in this standard are therefore also aimed at
ensuring compatibility with the requirements of IT equipment. This, subject any limitation stated in the
manufacturer’s declaration, includes requirements for steady state and transient voltage variation as well as for the
supply of both linear and non-linear load characteristics of IT equipment.
NOTE 2 Test loads specified in this standard simulate both linear and non-linear load characteristics. Their use is
prescribed with the objective of verifying design and performance, as declared by the manufacturer, and also of
minimising any complexity and energy consumption during the tests.
NOTE 3 This standard is aimed at 50 Hz and 60 Hz applications but does not exclude other frequency
applications within the domain of IEC 60196. This is subject to an agreement between manufacturer and purchase
in respect to any particular requirements arising.
NOTE 4 Single phase and three-phase voltage UPS covered by this standard include without limitation UPS
supplying single-phase, two-wire; single-phase, three-wire; two-phase, three-wire, three-phase, three-wire and
three-phase, four-wire loads.
62040-3  IEC:2011 – 9 –
2 Normative references
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 60038, IEC standard voltages
IEC 60068-2-1, Environmental testing - Part 2-1: Tests – Test A: Cold
IEC 60068-2-2, Environmental testing – Part 2-2: Tests – Test B: Dry heat
IEC 60068-2-27, Environmental testing – Part 2-27: Tests – Test Ea and guidance: Shock
IEC 60068-2-31:2008, Environmental testing – Part 2-31: Tests – Test Ec: Rough handling
shocks, primarily for equipment-type specimens
IEC 60068-2-78, Environmental testing – Part 2-78: Tests – Test Cab: Damp heat, steady
state
IEC 60146-1-1:2009, Semiconductor converters – General requirements and line commutated
converters – Part 1-1: Specification of basic requirements
IEC 60146-2:1999, Semiconductor converters – Part 2: Self-commutated semiconductor
converters including direct d.c. converters
IEC 60196, IEC standard frequencies
IEC 60364-1, Low-voltage electrical installations – Part 1: Fundamental principles,
assessment of general characteristics, definitions
IEC 60364-5-52, Low-voltage electrical installations – Part 5-52: Selection and erection of
electrical equipment – Wiring systems
IEC 60947-3, Low-voltage switchgear and controlgear – Part 3: Switches, disconnectors,
switch-disconnectors and fuse-combination units
IEC 60947-6-1, Low-voltage switchgear and controlgear – Part 6-1: Multiple function
equipment – Transfer switching equipment
IEC 60950-1, Information technology equipment – Safety – Part 1: General requirements
IEC 60990, Methods of measurement of touch current and protective conductor current
IEC 61000-2-2:2002, Electromagnetic compatibility (EMC) – Part 2-2: Environment –
Compatibility levels for low-frequency conducted disturbances and signalling in public low-
voltage power supply systems
IEC 61000-3-2, Electromagnetic compatibility (EMC) – Part 3-2: Limits – Limits for harmonic
current emissions (equipment input current ≤ 16 A per phase)
IEC/TS 61000-3-4, Electromagnetic compatibility (EMC) – Part 3-4: Limits – Limitation of
emission of harmonic currents in low-voltage power supply systems for equipment with rated
current greater than 16 A
– 10 – 62040-3  IEC:2011
IEC 61000-3-12, Electromagnetic compatibility (EMC) – Part 3-12: Limits – Limits for
harmonic currents produced by equipment connected to public low-voltage systems with input
current > 16 A and ≤ 75 A per phase
IEC 61000-4-30, Electromagnetic compatibility (EMC) – Part 4-30: Testing and measurement
techniques – Power quality measurement methods
IEC 61672-1, Electroacoustics ‒ Sound level meters – Part 2: Pattern evaluation tests
IEC 62040-1:2008, Uninterruptible power systems (UPS) – Part 1: General and safety
requirements for UPS
IEC 62040-2, Uninterruptible power systems (UPS) – Part 2: Electromagnetic compatibility
(EMC) requirements
IEC 62310-3:2008, Static transfer systems (STS) – Part 3: Method for specifying performance
and test requirements
ISO 7779:2010, Acoustics – Measurement of airborne noise emitted by information technology
and telecommunications equipment
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
NOTE In this standard, IEC 60050 definitions are referenced wherever possible, particularly those of
IEC 60050(551).
When an existing IEC 60050 definition needs amplification or additional information, this is indicated by adding the
word “modified” after the IEC 60050 reference.
3.1 Systems and components
3.1.1
uninterruptible power system
UPS
combination of convertors, switches and energy storage devices (such as batteries),
constituting a power system for maintaining continuity of load power in case of input power
failure
NOTE Input power failure occurs when voltage and frequency are outside rated steady-state and transient
tolerance bands or when distortion or interruptions are outside the limits specified for the UPS.
3.1.2
(electronic) (power) converter or convertor
an operative unit for electronic power conversion, comprising one or more electronic valve
devices, transformers and filters if necessary and auxiliaries if any
NOTE In English, the two spellings "converter" and "convertor" are in use, and both are correct.
[IEC 60050-551:1998, 551-12-01]
3.1.3
UPS functional unit
functional unit, for example, a UPS rectifier, a UPS inverter or a UPS switch

62040-3  IEC:2011 – 11 –
3.1.4
UPS rectifier
electronic converter for rectification
[IEC 60050-551:1998, 551-12-07, modified]
3.1.5
UPS inverter
electronic converter for inversion
[IEC 60050-551:1998, 551-12-10, modified]
3.1.6
energy storage system
system consisting of single or multiple devices and designed to provide power to the UPS
inverter for the required stored energy time
NOTE Notwithstanding challenges with respect to recharge, examples of energy storage systems include but are
not limited to battery, double-layer capacitor (“super” or “ultra” capacitor), flywheel and fuel-cell systems.
3.1.7
d.c. link
direct current power interconnection between the rectifier or rectifier/charger and the inverter
functional unit
NOTE 1 The voltage of the energy storage system may differ from that of the d.c. link.
NOTE 2 The d.c. link may include converters.
3.1.8
battery
set of electrochemical cells of the same type so connected as to act together
[IEC 60050-151:2001, 151-12-11, modified]
3.1.9
secondary battery (of electrochemical cells)
composite system in which electric energy produces chemical reactions or, conversely, in
which the energy produced by chemical reactions is mainly delivered as electric energy
[IEC 60050-111:1996, 111-15-10]
NOTE 1 A valve regulated secondary battery consists of cells which are closed but have a valve which allows the
escape of gas if the internal pressure exceeds a predetermined value. Valve regulated lead-acid cells are
abbreviated as VRLA cells [IEC 60050-482:2004, 482-05-15, modified].
NOTE 2 A vented secondary battery consists of cells having a cover provided with an opening through which
products of electrolysis and evaporation are allowed to escape freely, or through a venting system, from the cell to
the atmosphere [IEC 60050-482:2004, 482-05-14, modified].
3.1.10
flywheel storage system
mechanical energy storage system wherein stored kinetic energy can be converted to d.c.
power during stored energy mode of operation
3.1.11
battery charger
device for changing alternating current power to direct current power for the purpose of
charging a battery
– 12 – 62040-3  IEC:2011
3.1.12
UPS switch
controllable switch used in accordance with applicable requirements for load power continuity
to interconnect or isolate power ports of UPS units, bypass or load
NOTE 1 Annex C details UPS switch applications.
NOTE 2 Examples of ports include a group of terminals and sockets.
3.1.13
transfer switch
UPS switch used to transfer power from one source to another
NOTE Transfer represents the act of switching the supply path to the load from one source to another.
3.1.14
electronic (power) switch
UPS switch comprising at least one controllable valve device
[IEC 60050-551:1998, 551-13-01, modified]
NOTE A static bypass switch is an example of an electronic (power) switch.
3.1.15
mechanical (power) switch
UPS switch with mechanically separable contacts
3.1.16
hybrid (power) switch
UPS switch with mechanically separable contacts in combination with at least one controlled
electronic valve device
3.1.17
self-commutated electronic switch
electronic switch where the commutating voltage is supplied by components within the
electronic switch
3.1.18
line-commutated electronic switch
electronic switch where the commutating voltage is supplied by the line
3.1.19
interrupter
UPS switch which is capab
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