Rotating electrical machines - Part 22: AC generators for reciprocating internal combustion (RIC) engine driven generating sets

IEC 60034-22:2009 establishes the principal characteristics of a.c. generators under the control of their voltage regulators when used for reciprocating internal combustion engine driven generating set applications and supplements the requirements given in IEC 60034-1. It covers the use of such generators for land and marine use, but excludes generating sets used on aircraft or used to propel land vehicles and locomotives. The most important changes with respect to the previous edition are: - technical changes to many definitions; - revision of table 1 and of the annex.

Drehende elektrische Maschinen - Teil 22: Wechselstromgeneratoren für Stromerzeugungsaggregate mit Hubkolben-Verbrennungsmotoren

Machines électriques tournantes - Partie 22: Génératrices à courant alternatif pour groupes électrogènes entraînés par un moteur à combustion interne

La CEI 60034-22:2009 établit les principales caractéristiques des génératrices à courant alternatif, équipées de leurs régulateurs de tension et utilisées pour des groupes électrogènes entraînés par un moteur à combustion interne; elle complète les exigences données dans la CEI 60034-1. Elle couvre les applications terrestres et marines de telles génératrices, mais exclut les groupes électrogènes utilisés à bord des aéronefs ou pour la propulsion de véhicules terrestres et de locomotives. Les changements les plus importants par rapport à l'édition précédente sont les suivants: - modifications des définitions, - révision du tableau 1 et de l'annexe.

Električni rotacijski stroji - 22. del: Izmenični generatorji za generatorske sklope, ki jih poganjajo batni stroji z notranjim zgorevanjem (IEC 60034-22:2009)

Ta del IEC 60034 vzpostavlja glavne značilnosti izmeničnih generatorjev pod nadzorom njihovih napetostnih regulatorjev, kadar se uporabljajo pri delovanju generatorskega sklopa, ki ga poganjajo batni stroji z notranjim zgorevanjem, in dopolnjuje zahteve, podane v IEC 60034-1. Zajema uporabo takih generatorjev za kopensko in pomorsko uporabo, vendar izvzema generatorske sklope, uporabljene v letalih ali uporabljene za pogon kopenskih vozil in lokomotiv.

General Information

Status
Published
Publication Date
10-Dec-2009
Technical Committee
Drafting Committee
Parallel Committee
Current Stage
6060 - Document made available
Start Date
11-Dec-2009
Due Date
10-Jan-2010
Completion Date
11-Dec-2009

RELATIONS

Buy Standard

Standard
EN 60034-22:2010 - natisnjeno za čitalnico
English language
23 pages
sale 10% off
Preview
sale 10% off
Preview
e-Library read for
1 day

Standards Content (sample)

SLOVENSKI STANDARD
SIST EN 60034-22:2010
01-februar-2010
1DGRPHãþD
SIST EN 60034-22:1999

(OHNWULþQLURWDFLMVNLVWURMLGHO,]PHQLþQLJHQHUDWRUML]DJHQHUDWRUVNHVNORSHNL

MLKSRJDQMDMREDWQLVWURML]QRWUDQMLP]JRUHYDQMHP ,(&
Rotating electrical machines - Part 22: AC generators for reciprocating internal
combustion (RIC) engine driven generating sets (IEC 60034-22:2009)
Drehende elektrische Maschinen - Teil 22: Wechselstromgeneratoren für
Stromerzeugungsaggregate mit Hubkolben-Verbrennungsmotoren (IEC 60034-22:2009)

Machines électriques tournantes - Partie 22: Génératrices à courant alternatif pour

groupes électrogènes entraînés par un moteur à combustion interne (CEI 60034-
22:2009)
Ta slovenski standard je istoveten z: EN 60034-22:2009
ICS:
27.020 Motorji z notranjim Internal combustion engines
zgorevanjem
29.160.40 (OHNWULþQLDJUHJDWL Generating sets
SIST EN 60034-22:2010 en,fr

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN 60034-22:2010
---------------------- Page: 2 ----------------------
SIST EN 60034-22:2010
EUROPEAN STANDARD
EN 60034-22
NORME EUROPÉENNE
December 2009
EUROPÄISCHE NORM
ICS 29.160 Supersedes EN 60034-22:1997
English version
Rotating electrical machines -
Part 22: AC generators for reciprocating internal combustion (RIC)
engine driven generating sets
(IEC 60034-22:2009)
Machines électriques tournantes - Drehende elektrische Maschinen -
Partie 22: Génératrices à courant alternatif Teil 22: Wechselstromgeneratoren
pour groupes électrogènes für Stromerzeugungsaggregate
entraînés par un moteur mit Hubkolben-Verbrennungsmotoren
à combustion interne (IEC 60034-22:2009)
(CEI 60034-22:2009)

This European Standard was approved by CENELEC on 2009-11-01. 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: Avenue Marnix 17, B - 1000 Brussels

© 2009 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.

Ref. No. EN 60034-22:2009 E
---------------------- Page: 3 ----------------------
SIST EN 60034-22:2010
EN 60034-22:2009 - 2 -
Foreword

The text of document 2/1568/FDIS, future edition 2 of IEC 60034-22, prepared by IEC TC 2, Rotating

machinery, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as

EN 60034-22 on 2009-11-01.
This European Standard supersedes EN 60034-22:1997.
The technical changes with regard to EN 60034-22:1997 include:

– Clause 2: The standards which were not referenced in the text have been deleted.

– Clause 3: Technical and editorial changes to many of the definitions have been made.

– Clause 4: In the NOTE, the quantity T has been replaced by TL.
– Clause 7: Technical and editorial changes to many clauses have been made.
– Clause 9: Table 1 has been revised.
– Annex A: This annex has been revised.
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) 2010-08-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2012-11-01
Annex ZA have been added by CENELEC.
__________
Endorsement notice

The text of the International Standard IEC 60034-22:2009 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 60027-1 NOTE Harmonized as EN 60027-1:2006 (not modified).
IEC 60027-4 NOTE Harmonized as EN 60027-4:2007 (not modified).
IEC 60034-26 NOTE Harmonized as EN 60034-26:2006 (not modified).
__________
---------------------- Page: 4 ----------------------
SIST EN 60034-22:2010
- 3 - EN 60034-22:2009
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 60034-1 2004 Rotating electrical machines - EN 60034-1 2004
Part 1: Rating and performance
1) 2)
IEC 60085 - Electrical insulation - EN 60085 2008
Thermal evaluation and designation
1) 2)
CISPR 11 (mod) - Industrial, scientific and medical equipment - EN 55011 2009
Radio-frequency disturbance characteristics -
Limits and methods of measurement
Undated reference.
Valid edition at date of issue.
---------------------- Page: 5 ----------------------
SIST EN 60034-22:2010
---------------------- Page: 6 ----------------------
SIST EN 60034-22:2010
IEC 60034-22
Edition 2.0 2009-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Rotating electrical machines –
Part 22: AC generators for reciprocating internal combustion (RIC) engine driven
generating sets
Machines électriques tournantes –
Partie 22: Génératrices à courant alternatif pour groupes électrogènes entraînés
par un moteur à combustion interne
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX
ICS 29.160 ISBN 2-8318-1065-4
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 7 ----------------------
SIST EN 60034-22:2010
– 2 – 60034-22 © IEC:2009
CONTENTS

FOREWORD...........................................................................................................................3

1 Scope...............................................................................................................................5

2 Normative references........................................................................................................5

3 Terms and definitions .......................................................................................................5

4 Rating...............................................................................................................................9

5 Limits of temperature and temperature rise .....................................................................10

5.1 Base continuous rating ..........................................................................................10

5.2 Peak continuous rating ..........................................................................................10

6 Parallel operation............................................................................................................10

6.1 General .................................................................................................................10

6.2 Effect of electromechanical vibration and its frequency...........................................11

7 Special load conditions ...................................................................................................11

7.1 General .................................................................................................................11

7.2 Unbalanced load current ........................................................................................11

7.3 Sustained short-circuit current (see also 8.3) .........................................................11

7.4 Occasional excess current capability......................................................................11

7.5 Total harmonic distortion (THD) .............................................................................11

7.6 Radio interference suppression..............................................................................12

8 Asynchronous generators with excitation equipment........................................................12

8.1 General .................................................................................................................12

8.2 Rated speed and rated slip ....................................................................................12

8.3 Sustained short-circuit current ...............................................................................12

8.4 Range of voltage setting (see also 3.9) .................................................................12

8.5 Parallel operation (see also Clause 6)....................................................................12

9 Operating limit values .....................................................................................................12

10 Rating plate ....................................................................................................................13

Annex A (informative) AC generator transient voltage characteristic following a sudden

change in load ......................................................................................................................15

Bibliography ..........................................................................................................................20

Figure A.1 – Generator transient voltage versus time for sudden load application and

removal: r.m.s. voltage versus time .......................................................................................17

Figure A.2 – Generator transient voltage versus time for sudden load applications:

instantaneous voltage versus time.........................................................................................18

Figure A.3 – Performance curves (step loading) (cos φ ≤ 0,4) ................................................19

Table 1 − Operating limit values ............................................................................................13

---------------------- Page: 8 ----------------------
SIST EN 60034-22:2010
60034-22 © IEC:2009 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ROTATING ELECTRICAL MACHINES –
Part 22: AC generators for reciprocating internal combustion (RIC)
engine driven generating sets
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 60034-22 has been prepared by IEC technical committee 2:

Rotating machinery.

This second edition cancels and replaces the first edition published in 1996 and constitutes a

technical revision.
The technical changes with regard to the previous edition include:

– Clause 2: The standards which were not referenced in the text have been deleted.

– Clause 3: Technical and editorial changes to many of the definitions have been made.

– Clause 4: In the NOTE, the quantity T has been replaced by TL.
– Clause 7: Technical and editorial changes to many clauses have been made.
– Clause 9: Table 1 has been revised.
– Annex A: This annex has been revised.
---------------------- Page: 9 ----------------------
SIST EN 60034-22:2010
– 4 – 60034-22 © IEC:2009
The text of this standard is based on the following documents:
FDIS Report on voting
2/1568/FDIS 2/1573/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.

A list of all parts of IEC 60034 series, under the general title, Rotating electrical machines, can

be found on the IEC website.

NOTE A table of cross-references of all IEC TC 2 publications can be found in the IEC TC 2 dashboard on the IEC

website.

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

maintenance result 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.
---------------------- Page: 10 ----------------------
SIST EN 60034-22:2010
60034-22 © IEC:2009 – 5 –
ROTATING ELECTRICAL MACHINES –
Part 22: AC generators for reciprocating internal combustion (RIC)
engine driven generating sets
1 Scope

This part of IEC 60034 establishes the principal characteristics of a.c. generators under the

control of their voltage regulators when used for reciprocating internal combustion (RIC) engine

driven generating set applications and supplements the requirements given in IEC 60034-1. It

covers the use of such generators for land and marine use, but excludes generating sets used

on aircraft or used to propel land vehicles and locomotives.

NOTE 1 For some specific applications (e.g. essential hospital supplies, high-rise buildings, etc.) supplementary

requirements may be necessary. The provisions of this standard should be regarded as a basis for such

requirements.

NOTE 2 Attention is drawn to the need to take note of additional regulations or requirements imposed by various

regulatory bodies. Such regulations or requirements may form the subject of agreement between the customer and

the manufacturer when conditions of use of the end product invoke such requirements.

NOTE 3 Examples of regulatory authorities:

− classification societies, for generating sets used on ships and offshore installations;

− government agencies;
− inspection agencies, local utilities, etc.

Annex A discusses the behaviour of generators covered by this standard when subjected to

sudden load changes.
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.
− Part 1: Rating and performance
IEC 60034-1:2004, Rotating electrical machines
IEC 60085, Electrical insulation – Thermal evaluation and designation

CISPR 11, Industrial, scientific and medical equipment – Radio-frequency disturbance

characteristics – Limits and methods of measurement
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply:

NOTE 1 In this standard, suffix “N” is used for “rated” in accordance with IEC 60027-1 and IEC 60027-4 whereas

in ISO 8528, suffix “r” is so used.

NOTE 2 Voltage terms relate to a generator running at constant (rated) speed under the control of the normal

excitation and voltage control system.
---------------------- Page: 11 ----------------------
SIST EN 60034-22:2010
– 6 – 60034-22 © IEC:2009
3.1
rated output

the product of the rated r.m.s. voltage, the rated r.m.s. current and a constant m, expressed in

volt-amperes (VA) or its decimal multiples
where
m = 1 for single-phase;
m = 2 for two-phase;
m = 3 for three-phase
3.2
rated active power

the product of the rated r.m.s. voltage, the in-phase component of the rated r.m.s. current and

a constant m, expressed in watts (W) or its decimal multiples
where
m = 1 for single-phase;
m = 2 for two-phase;
3 for three-phase
m =
3.3
rated power factor
cos φ
the ratio of the rated active power to the rated output
cosφ=
3.4
rated reactive power

the geometrical difference of the rated apparent power and the rated active power expressed in

volt-amperes reactive (var) or its decimal multiples
2 2
Q =()S − P
N N
3.5
rated speed of rotation
the speed of rotation necessary for voltage generation at rated frequency
NOTE 1 For a synchronous generator, the rated speed of rotation is given by:
n =
where
p is the number of pole pairs;
f is the rated frequency (according to load requirements).
For an asynchronous generator the rated speed of rotation is given by:
---------------------- Page: 12 ----------------------
SIST EN 60034-22:2010
60034-22 © IEC:2009 – 7 –
n = 1− s
N N
where
p is the number of pole pairs;
f is the rated frequency (according to load requirements);
s is the rated slip.

NOTE 2 Since the slip of an asynchronous generator is always negative, the rated speed is above the

synchronous speed.
3.6
rated slip

the difference between the synchronous speed and the rated speed of the rotor divided by the

synchronous speed, when the generating set is giving its rated active power
− n
s =
NOTE Rated slip s is only relevant to an asynchronous generator.
3.7
rated voltage
the line-to-line voltage at the terminals of the generator at rated frequency

NOTE Rated voltage is the voltage assigned by the manufacturer for operating and performance characteristics.

3.8
no-load voltage

the line-to-line voltage at the terminals of the generator at rated frequency and no-load

3.9
range of voltage setting

the range of possible upward and downward adjustment of voltage at generator terminals

(ΔU and ΔU , where U is the upper limit of voltage setting and U is the lower limit of

sup sdo sup sdo

voltage setting) at rated frequency, for all loads between no-load and rated output.

ΔU = | ΔU | + | ΔU |
s sup sdo
The voltage setting range is expressed as a percentage of the rated voltage.
a) upward range, ΔU
sup
U − U
sup N
ΔU = ×100 %
sup
b) downward range, ΔU
sdo
U − U
sdo N
ΔU = ×100 %
sdo
---------------------- Page: 13 ----------------------
SIST EN 60034-22:2010
– 8 – 60034-22 © IEC:2009
3.10
steady-state voltage tolerance band

the agreed voltage band about the steady-state voltage that the voltage may reach within a

given voltage recovery time after a specified sudden increase or decrease of load

3.11
steady-state voltage regulation

the change in steady-state voltage for all load changes between no-load and rated output,

taking into account the influence of temperature but not considering the effect of quadrature

current compensation voltage droop.

NOTE The initial set voltage is usually rated voltage, but may be anywhere within the range of voltage setting,

ΔU . See 3.9.

The steady-state voltage regulation is expressed as a percentage of the rated voltage.

UU−
st:max st:min
ΔU = ×100%
3.12
transient voltage regulation
dynU

the maximum voltage change following a sudden change of load, expressed as a percentage of

the rated voltage.
a) With load increase
maximum transient voltage drop δ
dynU

the voltage drop when the generator, initially at rated voltage, is switched onto a

symmetrical load which absorbs a specified current at rated voltage at a given power

factor or range of power factors.
UU−
dyn:min N
δ = × 100%
dynU
b) With load decrease
maximum transient voltage rise δ
dynU

the voltage rise when a specified load at a given power factor is suddenly switched off.

UU−
dyn:max N
δ = × 100 %
dynU
3.13
voltage recovery time
rec

the time interval from the time at which a load change is initiated (t ) until the time when the

voltage returns to and remains within the specified steady-state voltage tolerance band (t )

u, in
tt=−t
rec u, in 0
___________
For an explanation of these terms and examples of their use, see Annex A.
---------------------- Page: 14 ----------------------
SIST EN 60034-22:2010
60034-22 © IEC:2009 – 9 –
3.14
recovery voltage U
rec
the final steady-state voltage for a specified load condition

NOTE Recovery voltage is normally expressed as a percentage of the rated voltage. For loads in excess of rated,

recovery voltage is limited by saturation and exciter-regulator field forcing capability.

3.15
voltage modulation
mod

the quasi-periodic voltage variation (peak-to-valley) about a steady-state voltage having typical

frequencies below the fundamental generation frequency expressed as a percentage of

average peak voltage at rated frequency and uniform drive
UU−
mod:max mod:min
U =×2 × 100 %
mod
UU+
mod:max mod:min
3.16
voltage unbalance
ubal

the rms value of the unbalanced phase voltages between consecutive phases in a three-phase

system that may occur.
Voltage unbalance is expressed as a percentage of the mean voltage
ˆ ˆ
U − U
max mean
U = ×100 %
ubal
mean
3.17
voltage regulation characteristics

curves of terminal voltage as a function of load current at a given power factor under steady-

state conditions at rated speed without any manual adjustment of the voltage regulation system

3.18
relative thermal life expectancy factor

the relative thermal life expectancy related to the thermal life expectancy in case of duty type

S1 with rated output (see Annex A of IEC 60034-1)
4 Rating

The generator rating class shall be specified in accordance with IEC 60034-1. In the case of

generators for RIC engine driven generating sets, continuous ratings (duty type S1) or ratings

with discrete constant loads (duty type S10) are applicable.

For the purpose of this standard, the maximum continuous rating based on duty type S1 is

named the base continuous rating (BR).

Additionally, for duty type S10, there is a peak continuous rating (PR), where the permissible

generator temperature rises are increased by a specific amount according to the thermal

classification.

NOTE In the case of duty type S10, operation at the peak continuous rating (PR) thermally ages the generator

insulation systems at an increased rate. Quantity TL for the relative thermal life expectancy of the insulation system

is therefore an important integral part of the rating class (see 4.2.10 of IEC 60034-1).

___________
For an explanation of these terms and examples of their use, see Annex A.
---------------------- Page: 15 ----------------------
SIST EN 60034-22:2010
– 10 – 60034-22 © IEC:2009
5 Limits of temperature and temperature rise
5.1 Base continuous rating

The generator shall be capable of delivering its base continuous rating (BR) over the whole

range of operating conditions (e.g. minimum to maximum coolant temperatures) with total

temperatures not exceeding the sum of 40 °C and the temperature rises specified in Table 6 of

IEC 60034-1. See Note 1 below.
5.2 Peak continuous rating

At the generator peak continuous rating (PR), the total temperatures may be increased by the

following allowances (see Notes 1 and 2).
Thermal classification in
Rating <5 MVA Rating ≥5 MVA
accordance with IEC 60085
A or E 15 ºC 10 ºC
B or F 20 ºC 15 ºC
H 25 ºC 20 ºC

For ambient temperatures below 10 °C, the limit of total temperature shall be reduced by 1 °C

for each °C by which the ambient temperature is below 10 °C.

NOTE 1 The RIC engine output may vary with changes of ambient air temperature. In operation, the generator

total temperature will depend upon its primary coolant temperature which is not necessarily related to the RIC

engine inlet air temperature.

NOTE 2 When the generator operates at these higher temperatures, the generator insulation system will age

thermally at between 2 to 6 times the rate which occurs at the generator base continuous rating temperature rise

values (depending on the temperature increase and specific insulation system). For example, the thermal ageing

relevant to operation for 1 h at peak continuous rating is approximately equal to that obtained with operation for 2 h

to 6 h at base continuous rating. It is essential that the value of TL be determined by the manufacturer and marked

on the rating plate in accordance with item b) of Clause 10.
6 Parallel operation
6.1 General

When running in parallel with other generator sets or with another source of supply, means

shall be provided to ensure stable operation and correct sharing of reactive power.

This is most often effected by influencing the automatic voltage regulator by a sensing circuit

with an additional reactive current component. This causes a voltage droop characteristic for

reactive loads.

The grade of quadrature current compensation (QCC) voltage droop δ is the difference

qcc

between the no-load voltage U and the voltage at the rated current at the power factor zero

(overexcited) U when running isolated, expressed as a percentage of rated voltage U .

U − U
0 Q
δ = ×100 %
qcc
NOTE 1 Unity power factor loads produce virtually no droop.

NOTE 2 Identical a.c. generators with identical excitation systems may operate in parallel without requiring voltage

droop when their field windings are connected by equalizer links. Adequate reactive load sharing is achieved when

there is correct active load sharing.
---------------------- Page: 16 ----------------------
SIST EN 60034-22:2010
60034-22 © IEC:2009 – 11 –

NOTE 3 When generating sets are operating in parallel with star points directly connected together, circulating

currents may occur, particularly third harmonic currents. Circulating currents can increase the r.m.s. current which

may reduce the thermal life expectancy of the insulation system.
6.2 Effect of electromechanical vibration and its frequency

It is the responsibility of the generating set manufacturer to ensure that the set shall operate

stably in parallel with others, and the generator manufacturer shall collaborate as necessary to

achieve this.
If there
...

Questions, Comments and Discussion

Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.