IEC 88528-11:2004

Reciprocating internal combustion engine driven alternating current generating sets — Part 11: Rotary uninterruptible power systems — Performance requirements and test methods

Specifies criteria, including performance and test methods, for rotary uninterruptible power systems arising out of a combination of mechanical and electrical rotating machines. Applies to power supplies primarily designed for supplying uninterrupted a.c. power to the consumer.

Groupes électrogènes à courant alternatif entraînés par moteurs alternatifs à combustion interne — Partie 11: Systèmes électriques alternatifs sans interruption — Exigences de performance et méthodes d'essai

General Information

• Status: Published
• Publication Date: 26-May-2004
• ICS: 27.020 - Internal combustion engines
• Technical Committee: ISO/TC 70 - Internal combustion engines
• Drafting Committee: ISO/TC 70 - Internal combustion engines
• Current Stage: 9093 - International Standard confirmed
• Completion Date: 26-Nov-2020

Standards Content (Sample)

INTERNATIONAL IEC

STANDARD 88528-11


First edition
2004-03

Reciprocating internal combustion engine driven
alternating current generating sets –
Part 11:
Rotary uninterruptible power systems –
Performance requirements and test methods
Reference number
IEC 88528-11:2004(E)

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INTERNATIONAL IEC


STANDARD 88528-11


First edition
2004-03



Reciprocating internal combustion engine driven
alternating current generating sets –
Part 11:
Rotary uninterruptible power systems –
Performance requirements and test methods
 IEC 2004
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any
means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher.
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PRICE CODE
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For price, see current catalogue

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CONTENTS
FOREWORD.5

1 Scope.7
2 Normative references.7
3 Terms and definitions .8
3.1 General.8
3.2 Performance of systems and components .9
3.3 Specified values.10
3.4 Input values.11
3.5 Output values.12
4 Symbols and abbreviations.12
5 Selection criteria.12
6 General description.13
6.1 Rotary UPS.13
6.2 Types of rotary UPS .13
6.2.1 Series connected rotary UPS.13
6.2.2 Line interactive rotary UPS .14
6.3 Parallel operation of a rotary UPS installation.15
6.3.1 General.15
6.3.2 Parallel operation.15
6.3.3 Redundant operation.15
6.4 Power system changeover with rotary UPS installations (bypass).16
6.5 Enclosure protection.16
7 Modes of operation.16
7.1 Power conditioning mode .17
7.2 Independent mode.17
7.3 Bypass mode.18
7.4 Off mode.18
7.5 Transitions.18
7.5.1 Transition 1, starting the system with mains voltage present.18
7.5.2 Transition 2, start-up without mains voltage (black start) .18
7.5.3 Transition 3, disconnect from grid.19
7.5.4 Transition 4, connect to grid .19
7.5.5 Transition 6, transfer.19
7.5.6 Transition 7, 8, retransfer .19
8 Service conditions .19
8.1 Normal service conditions .19
8.2 Operation at extended ambient.19
8.2.1 Ambient service temperature.19
8.2.2 Ambient storage and transportation conditions .19
8.3 Engines.20
8.4 Rotating electrical machines.20
8.5 Control logic.20

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88528-11  IEC:2004(E) – 3 –
9 Electrical service conditions and performance .20
9.1 General – all rotary UPS.20
9.2 Performance.21
10 Manufacturer technical declarations .22
10.1 General.22
10.2 Purchaser specification guidelines.22
10.2.1 Type of rotary UPS, additional features, and system requirements .23
10.2.2 Rotary UPS input.23
10.2.3 Load to be supplied from a rotary UPS .23
10.2.4 Rotary UPS output.24
10.2.5 Battery (where applicable) .24
10.2.6 General application requirements and special service conditions.25
10.2.7 Multi-module system configurations .25
10.2.8 Electromagnetic compatibility.26
11 Testing.27
11.1 Static output voltage and frequency deviations.27
11.2 Dynamic output voltage and frequency deviations .28
11.3 Input current characteristics .28
11.4 Measurement of filter properties .28
11.4.1 From mains to output.28
11.4.2 From output to mains.30
11.5 System performance.30
11.5.1 Efficiency.30
11.5.2 Stored energy times .30
11.5.3 Multi-module rotary UPS performance .30
11.6 Black start test.31
11.7 Environmental tests.31
11.8 Audible noise.31
11.9 Testing.31
12 Maintenance and product marking .33
12.1 Nameplate markings.33
12.2 Label requirements.34
12.3 Name plate marker.34
12.4 Decals – labelling .35
12.4.1 Safety instructions and documentation .35
12.5 Maintenance.35

Annex A (informative) Typical energy storage devices .36
Annex B (normative) Reference non-linear load – Single-phase.40
Annex C (normative) Reference non-linear load – Three-phase .42
Annex D (normative) Input mains failure – Test method .43
Annex E (informative) Types of uninterruptible power systems (UPS) configurations .44

Figure 1 – Types of UPS systems .13
Figure 2 – Typical example series connected rotary UPS.13
Figure 3 – Typical example of a line interactive rotary UPS.14
Figure 4 – Parallel operation of a rotary UPS .15

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Figure 5 – Bypass operation .16
Figure 6 – Illustration of rotary UPS operation .17
Figure 7 – Operating modes.18
Figure 8 – Surge test .29
Figure 9 – Warning label.34
Figure A.1 – Dual conversion – direct-coupled flywheel .37
Figure A.2 – Line interactive – direct-coupled flywheel.37
Figure A.3 – Dual conversion – indirect coupled flywheel.37
Figure A.4 – Line interactive – indirect coupled flywheel .38
Figure A.5 – Double fed a.c. machine .38
Figure A.6 – Dual conversion with battery.38
Figure A.7 – Line interactive with battery .39
Figure B.1 – Single-phase non-linear load .40
Figure C.1 – Three-phase non-linear load.42
Figure D.1 – Input mains failure test method.43
Figure E.1 – Series connected type 1 .44
Figure E.2 – Series connected type 2 .45
Figure E.3 – Line interactive .45
Figure E.4 – Typical UPS.46
Figure E.5 – Typical switchless dual feed UPS .47

Table 1 – Compatibility levels for individual harmonic voltages in mains power .21
Table 2 – Operating steady-state limit values for performance classes .21
Table 3 – Operating dynamic limit values for performance classes (note 1).22
Table 4 – Technical data sheets – Manufacturers declaration .26
Table 5 – Test methods for rotary UPS performance characteristics .32

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88528-11  IEC:2004(E) – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

RECIPROCATING INTERNAL COMBUSTION ENGINE DRIVEN
ALTERNATING CURRENT GENERATING SETS –

Part 11: Rotary uninterruptible power systems –
Performance requirements and test methods


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
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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 88528-11 has been prepared jointly by IEC technical committee 2:
Rotating machinery, and ISO technical committee 70: Internal combustion engines.
The text of this standard is based on the following documents:
FDIS Report on voting
2/1275/FDIS 2/1280/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.

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The committee has decided that the contents of this publication will remain unchanged until
2007. At this date, the publication will be
• reconfirmed;
• withdrawn;
• replaced by a revised edition, or
• amended.

IEC 88528-11 is integrated into the ISO 8528 series listed below, under the general title
Reciprocating internal combustion engine driven alternating current generating sets:
Part 1: Application, ratings and performance
Part 2: Engines
Part 3: Alternating current generators for generating sets
Part 4: Controlgear and switchgear
Part 5: Generating sets
Part 6: Test methods
Part 7: Technical declarations for specification and design
Part 8: Requirements and tests for low-power generating sets (available in English only)
Part 9: Measurement and evaluation of mechanical vibrations (available in English only)
Part 10: Measurement of airborne noise by the enveloping surface method
Part 12: Emergency power supply to safety services

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88528-11  IEC:2004(E) – 7 –
RECIPROCATING INTERNAL COMBUSTION ENGINE DRIVEN
ALTERNATING CURRENT GENERATING SETS –

Part 11: Rotary uninterruptible power systems –
Performance requirements and test methods


1 Scope
This International Standard, which forms part of the ISO 8528 series, specifies criteria,
including performance and test methods, for rotary uninterruptible power systems (UPS)
arising out of a combination of mechanical and electrical rotating machines. This standard
applies to power supplies primarily designed for supplying uninterrupted a.c. power to the
consumer. When operated without input mains feed, the power is provided by stored energy
and/or reciprocating internal combustion (RIC) engine and the output power is provided by
one or more rotating electrical machines.
This part 11 applies to a.c. power supplies primarily designed for supplying uninterruptible
electrical power for stationary land and marine use, excluding supplies for aircraft, land
vehicles or locomotives. It also excludes power supplies where the output power is generated
by static converters. (See IEC 62040-3.)
The use of a rotary UPS installation to improve the quality of a.c. power supply, to provide
voltage and/or frequency conversion, and to provide peak shaving is also described.
For some specific applications (for example, essential hospital supplies, offshore, non-
stationary applications, high rise buildings, nuclear, etc.) supplementary requirements may be
necessary. The provisions of this part of ISO 8528 should be used as a basis.
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 60034-1:2003, Rotating Electrical Machines – Part 1: Rating and performance
IEC 60034-22:1996, Rotating Electrical Machines – Part 22: AC generators for reciprocating
internal combustion (RIC) engine driven generating sets
IEC 60417 (all parts), Graphical symbols for use on equipment. Index, survey and compilation
of the single sheets
IEC 60529:1989, Degrees of protection provided by enclosures (IP Code)
IEC 61000, Electromagnetic compatibility (EMC)
ISO 3046-1:2003, Reciprocating internal combustion engines
ISO 7000, Graphical symbols for use on equipment
ISO 8178-1, Reciprocating internal combustion engines – Exhaust emission measurement –
Part 1: Test-bed measurement of gaseous and particulate exhaust emissions
ISO 8528-1, Reciprocating internal combustion engine driven alternating current generating
sets – Part 1: Application, ratings and performance

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ISO 8528-6, Reciprocating internal combustion engine driven alternating current generating
sets – Part 6: Test methods
ISO 8528-9, Reciprocating internal combustion engine driven alternating current generating
sets – Part 9: Measurement and evaluation of mechanical vibrations
ISO 8528-10, Reciprocating internal combustion engine driven alternating current generating
sets – Part 10: Measurement of airborne noise by the enveloping surface method
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1 General
3.1.1
generating set
one or more RIC engines to produce mechanical energy and one or more generators to
convert the mechanical energy into electrical energy together with components for
transmitting the mechanical energy (for example, couplings, gearbox) and where applicable
bearing and mounting components
3.1.2
uninterruptible power system (UPS)
power system for maintaining continuity of load power in the event of failure of the mains
power
3.1.3
rotary UPS
UPS where one or more electrical rotating machines provide the output voltage
3.1.4
converter
set of equipment, static or rotating, to convert one type of electric current to another type,
different in nature, voltage and/or frequency
3.1.5
power system reactor
regulated or non-regulated inductance in series with the input of some types of UPS
3.1.6
machine set
any combination of one or more electrical rotating machines
3.1.7
energy storage device
device to provide stored energy on failure of the normal power supply system. This energy
shall be available either during the total failure time or until the take over of a power supply by
the RIC engine
3.1.8
continuity of load power
availability of the power supplied to the load with voltage and frequency within steady-state
and transient tolerance bands and with distortion and power interruptions within the limits
specified for the load

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88528-11  IEC:2004(E) – 9 –
3.2 Performance of systems and components
3.2.1
mains power
power normally continuously available which is supplied from the electrical power system or
by independent electrical power generation
3.2.2
backfeed
condition where a portion of the voltage or energy available within the UPS is fed back to any
of the input terminals, either directly or by a leakage path
3.2.3
linear load
load where the parameter Z (load impedance) is a constant when a variable sinusoidal voltage
is applied to it and that a sinusoidal voltage causes a sinusoidal current
3.2.4
non-linear load
load where the parameter Z (load impedance) is no longer a constant but is a variable
dependent on other parameters, such as voltage or time
3.2.5
power failure
any variation in the input voltage or frequency of the mains power not within acceptable limits
3.2.6
redundant operation
any operation with the addition of parallel functional units or groups of functional units in a
system to enhance the availability of load power
3.2.7
power conditioning mode
stable mode of operation that the UPS finally attains when operating under the following
conditions:
– normal power is present and within its given tolerance;
– full (100 %) stored energy available within its given restored energy time;
– the operation is or may be continuous;
– the load is within its given range;
– the output voltage is within its given tolerance.
Where a bypass is used:
– the input voltage is available and within specified tolerances;
– the phase lock is active, if present.
3.2.8
independent mode
operation of the UPS when operating under the following conditions:
– normal power is disconnected or is out of given tolerance;
– energy is from storage device or RIC engine;
– load is within the given range;
– output voltage and frequency are within given tolerances.

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3.2.9
bypass mode
state the UPS attains when operating and the load is supplied via the bypass
3.2.10
off mode
state that the rotary UPS attains when de-energized and at rest
3.2.11
synchronization
adjustment of an a.c. power source to match another a.c. source in frequency and phase
angle
3.2.12
load power
power which is supplied to the load from the UPS
3.2.13
asynchronous transfer
switching of load power between two sources that are not synchronized. This transfer must
happen with an interruption
3.3 Specified values
3.3.1
rated value
value of a quantity used for specification purposes, established for a specified set of operating
conditions of a component, device, equipment, or system
[IEV 151-16-08]
3.3.2
tolerance band
range of values of a quantity within specified limits
3.3.3
deviation
difference between the desired value and the actual value of a variable at a given instant
NOTE This definition applies whether the desired value is constant or varies in time.
[IEV 351-12-15]
3.3.4
rated voltage
input or output supply voltage for which equipment is designed or specified
3.3.5
rated frequency
input or output frequency as declared by the manufacturer
3.3.6
phase angle
angle (usually expressed in electrical degrees) between reference points on one or more a.c.
waveforms
3.3.7
crest factor
ratio of the peak value of a periodic waveform to its r.m.s. value

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88528-11  IEC:2004(E) – 11 –
3.3.8
power
time rate of transferring or transforming energy or of doing work. (also called active power)
[IEV 111-13-30]
3.3.9
apparent
...