CLC/TR 61800-6:2007

Adjustable speed electrical power drive systems - Part 6: Guide for determination of types of load duty and corresponding current ratings

Provides alternative methods for specifying ratings for adjustable speed electrical power drive systems (PDS) and in particular their basic drive modules (BDM

Elektrische Leistungsantriebssysteme mit einstellbarer Drehzahl - Teil 6: Richtlinie zur Bestimmung von Lastspielarten und entsprechenden Strombemessungen

Entraînements électriques de puissance à vitesse variable - Partie 6: Guide de détermination du type de régime de charge et de dimensionnement en courant correspondant

Donne un choix de méthodes pour spécifier les valeurs assignées des systèmes d'entraînements électriques à vitesse variable (PDS) et en particulier leurs variateurs ou bases de motorisation (BDM).

Električni pogonski sistemi z nastavljivo hitrostjo - 6. del: Vodilo za ugotavljanje tipov obratovalnih obremenitev in ustreznih tokovnih vrednosti (IEC/TR 61800-6:2003)

General Information

• Status: Published
• Publication Date: 05-Feb-2007
• ICS: 29.130 - Switchgear and controlgear
• Technical Committee: CLC/TC 22X - Power electronics
• Drafting Committee: IEC/SC 22G - IEC_SC_22G
• Parallel Committee: IEC/SC 22G - IEC_SC_22G
• Current Stage: 6060 - Document made available - Publishing
• Start Date: 06-Feb-2007
• Completion Date: 06-Feb-2007
• Ref Project: SIST-TP CLC/TR 61800-6:2008 - Adjustable speed electrical power drive systems -- Part 6: Guide for determination of types of load duty and corresponding current ratings

Relations

• Replaces: EN 61136-1:1995 - Semiconductor power convertors - Adjustable speed electric drive systems - General requirements - Part 1: Rating specifications, particularly for d.c. motor drives
• Effective Date: 28-Jan-2023

Overview

CLC/TR 61800-6:2007 (IEC/TR 61800-6:2003 endorsed by CENELEC) is a technical report that provides guidance for determining types of load duty and the corresponding current ratings for adjustable speed electrical power drive systems (PDS) and their basic drive modules (BDM). The report explains alternative methods for specifying rating values (current‑time characteristics) for converters, semiconductor assemblies and associated equipment. It does not cover traction drives.

Key topics

• Load duty definitions - formalizes duty types used in drive specification: uniform load duty, intermittent peak load duty, intermittent load duty, intermittent load duty with no‑load intervals, repetitive load duty, and non‑repetitive load duty.
• Current‑time load charts - provides standard current‑time diagrams to record and classify load profiles and to support rating calculations.
• Rated values and procedures - guidance for establishing rated current‑time values for semiconductor assemblies, converters, transformers and equipment sections. Includes methods for calculating r.m.s. and mean currents over duty cycles.
• System rating considerations - rules for common converter transformers, double converters and reversible converters, and for specifying rated currents for uniform and various intermittent duties.
• Overload and surge capability - overview of requirements and how to account for short‑term peaks relative to steady‑state ratings.
• Duty classes for non‑repetitive loads - classification and typical rating curves for industrial non‑repetitive applications.
• Figures and tables - standardized figures (current‑time charts) and tables (symbols, duty classes) support consistent specification and communication.

Applications and users

This guide is practical for professionals involved in the design, specification, selection and testing of variable‑speed drive systems and power converters, including:

• Drive designers and OEMs sizing converters, BDMs, semiconductor assemblies and common transformers
• System integrators and control engineers defining duty cycles and ratings for industrial automation
• Procurement and specification authors creating technical requirements for variable‑speed drives
• Test laboratories and compliance engineers assessing current‑time performance and overload capability
• Maintenance and reliability engineers evaluating thermal loading and lifetime effects

Typical application areas include industrial motor drives, process control, pumping/compression systems, conveyor and machine‑tool drives (excluding traction).

Related standards

• IEC 61800-1 - rating specifications for low voltage adjustable speed d.c. drive systems
• IEC 61800-2 - rating specifications for low voltage adjustable frequency a.c. drive systems
• IEC 60146-1-1 - semiconductor converters general requirements
• Supersedes EN 61136-1:1995

Keywords: adjustable speed electrical power drive systems, load duty, current ratings, PDS, basic drive modules, duty cycle, current‑time chart, IEC/TR 61800-6, CLC/TR 61800-6:2007.

Standards Content (Sample)

SLOVENSKI STANDARD
01-januar-2008
(OHNWULþQLSRJRQVNLVLVWHPL]QDVWDYOMLYRKLWURVWMRGHO9RGLOR]DXJRWDYOMDQMH
WLSRYREUDWRYDOQLKREUHPHQLWHYLQXVWUH]QLKWRNRYQLKYUHGQRVWL,(&75

Adjustable speed electrical power drive systems - Part 6: Guide for determination of
types of load duty and corresponding current ratings (IEC/TR 61800-6:2003)
Elektrische Leistungsantriebssysteme mit einstellbarer Drehzahl - Teil 6: Richtlinie zur
Bestimmung von Lastspielarten und entsprechenden Strombemessungen (IEC/TR
61800-6:2003)
Entranements lectriques de puissance vitesse variable - Partie 6: Guide de dtermination
du type de rgime de charge et de dimensionnement en courant correspondant (IEC/TR
61800-6:2003)
Ta slovenski standard je istoveten z: CLC/TR 61800-6:2007
ICS:
29.130.01 Stikalne in krmilne naprave Switchgear and controlgear
na splošno in general
29.200 8VPHUQLNL3UHWYRUQLNL Rectifiers. Convertors.
6WDELOL]LUDQRHOHNWULþQR Stabilized power supply
QDSDMDQMH
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

TECHNICAL REPORT
CLC/TR 61800-6
RAPPORT TECHNIQUE
February 2007
TECHNISCHER BERICHT
ICS 29.130 Supersedes EN 61136-1:1995

English version
Adjustable speed electrical power drive systems –
Part 6: Guide for determination of types of load duty
and corresponding current ratings
(IEC/TR 61800-6:2003)
Entraînements électriques de puissance  Elektrische Leistungsantriebssysteme
à vitesse variable – mit einstellbarer Drehzahl –
Partie 6: Guide de détermination Teil 6: Richtlinie zur Bestimmung
du type de régime de charge von Lastspielarten und entsprechenden
et de dimensionnement en courant Strombemessungen
correspondant (IEC/TR 61800-6:2003)
(CEI/TR 61800-6:2003)
This Technical Report was approved by CENELEC on 2006-09-02.

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

© 2007 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. CLC/TR 61800-6:2007 E

Foreword
The text of the Technical Report IEC/TR 61800-6:2003, prepared by SC 22G, Adjustable speed electric
drive systems incorporating semiconductor power converters, of IEC TC 22, Power electronic systems
and equipment, was submitted to vote and was approved by CENELEC as CLC/TR 61800-6 on
2006-09-02.
This Technical Report supersedes EN 61136-1:1995.
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the Technical Report IEC/TR 61800-6:2003 was approved by CENELEC as a Technical Report
without any modification.
__________
- 3 - CLC/TR 61800-6:2007
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 60146-1-1 Semiconductor convertors - General EN 60146-1-1
- 1993
requirements and line commutated convertors
Part 1-1: Specifications of basic requirements

1) 2)
IEC 61800-1 Adjustable speed electrical power drive EN 61800-1
- 1998
systems
Part 1: General requirements - Rating
specifications for low voltage adjustable
speed d.c. power drive systems

1) 2)
IEC 61800-2 Adjustable speed electrical power drive EN 61800-2
- 1998
systems
Part 2: General requirements - Rating
specifications for low voltage adjustable
frequency a.c. power drive systems

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

RAPPORT CEI
TECHNIQUE IEC
TR 61800-6
TECHNICAL
Première édition
REPORT
First edition
2003-03
Entraînements électriques de puissance
à vitesse variable –
Partie 6:
Guide de détermination du type de régime
de charge et de dimensionnement
en courant correspondant
Adjustable speed electrical
power drive systems –
Part 6:
Guide for determination of types of load duty
and corresponding current ratings
 IEC 2003 Droits de reproduction réservés  Copyright - all rights reserved
Aucune partie de cette publication ne peut être reproduite ni No part of this publication may be reproduced or utilized in any
utilisée sous quelque forme que ce soit et par aucun procédé, form or by any means, electronic or mechanical, including
électronique ou mécanique, y compris la photocopie et les photocopying and microfilm, without permission in writing from
microfilms, sans l'accord écrit de l'éditeur. the publisher.
International Electrotechnical Commission, 3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, Switzerland
Telephone: [phone] Telefax: [phone] E-mail: [e-mail]  Web: www.iec.ch
CODE PRIX
P
Commission Electrotechnique Internationale
PRICE CODE
International Electrotechnical Commission
Международная Электротехническая Комиссия
Pour prix, voir catalogue en vigueur
For price, see current catalogue

TR 61800-6 © IEC:2003 – 3 –
CONTENTS
FOREWORD . 5
1 General. 9
1.1 Scope and object . 9
1.2 Normative references. 9
2 Definitions. 9
3 Rated values.17
3.1 General .17
3.2 System of establishing rated current-time values for semiconductor
assemblies and equipments .21
3.2.1 General.21
3.2.2 Rated current of a common converter transformer .21
3.2.3 Rated values of a double converter .21
3.2.4 Determination of type of load duty .21
3.3 Rated currents for equipments and sections .21
3.3.1 General.21
3.3.2 Rated currents for uniform load duty.23
3.3.3 Rated currents for intermittent peak load duty.23
3.3.4 Rated currents for intermittent load duty .23
3.3.5 Rated currents for intermittent load duty with no-load intervals.23
3.3.6 Rated currents for repetitive load duty .23
3.3.7 Rated currents for non-repetitive load duty .27
3.4 Overload and surge current capability .29
4 Duty classes for non-repetitive load duty .29
Figure 1 – Typical current-time chart for uniform load duty .11
Figure 2 – Typical current-time chart for intermittent peak load duty.11
Figure 3 – Typical current-time chart for intermittent load duty .13
Figure 4 – Typical time chart for intermittent load duty with no-load intervals .13
Figure 5 – Example of current-time chart for repetitive load duty .15
Figure 6 – Typical current-time chart for non-repetitive load duty.15
Figure 7 – Equivalent repetitive load duty load-time chart.27
Figure 8 – Typical rating curves for non-repetitive load duty .29
Table 1 – List of symbols .17
Table 2 – Duty classes for non-repetitive industrial applications .29

TR 61800-6 © IEC:2003 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
___________
ADJUSTABLE SPEED ELECTRICAL POWER DRIVE SYSTEMS –
Part 6: Guide for determination of types of load duty
and corresponding current ratings
FOREWORD
1) The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of the 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, the IEC publishes International Standards. 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. The 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 the 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 National Committees.
3) The documents produced have the form of recommendations for international use and are published in the form
of standards, technical specifications, technical reports or guides and they are accepted by the National
Committees in that sense.
4) In order to promote international unification, IEC National Committees undertake to apply IEC International
Standards transparently to the maximum extent possible in their national and regional standards. Any
divergence between the IEC Standard and the corresponding national or regional standard shall be clearly
indicated in the latter.
5) The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with one of its standards.
6) Attention is drawn to the possibility that some of the elements of this technical report may be the subject of
patent rights. The IEC shall not be held responsible for identifying any or all such patent rights.
The main task of IEC technical committees is to prepare International Standards. However, a
technical committee may propose the publication of a technical report when it has collected
data of a different kind from that which is normally published as an International Standard, for
example “state of the art”.
IEC 61800-6, which is a technical report, has been prepared by subcommittee 22G: Semi-
conductor power converters for adjustable speed electric drive systems, of IEC technical
committee 22: Power electronics systems and equipment.
This first edition cancels and replaces IEC 61136-1, issued in 1992, and constitutes a
technical revision.
The text of this technical report is based on the following documents:
Enquiry draft Report on voting
22G/85/DTR 22G/100/RVC
Full information on the voting for the approval of this technical report 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.

TR 61800-6 © IEC:2003 – 7 –
The committee has decided that the contents of this publication will remain unchanged until
2008. At this date, the publication will be
• reconfirmed;
• withdrawn;
• replaced by a revised edition, or
• amended.
TR 61800-6 © IEC:2003 – 9 –
ADJUSTABLE SPEED ELECTRICAL POWER DRIVE SYSTEMS –
Part 6: Guide for determination of types of load duty
and corresponding current ratings
1 General
1.1 Scope and object
This technical report provides alternative methods for specifying ratings for adjustable speed
electrical power drive systems (PDS) and in particular their basic drive modules (BDM).
It is not intended to cover adjustable speed drives for traction purposes.
General rules for rating specification for low voltage adjustable speed d.c. power drive systems
are contained in IEC 61800-1, and for low voltage adjustable frequency a.c. power drive
systems in IEC 61800-2.
1.2 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 60146-1-1, Semiconductor convertors – General requirements and line commutated
convertors – Part 1-1: Specifications of basic requirements
IEC 61800-1, Adjustable speed electrical power drive systems – Part 1: General requirments –
Rating specifications for low voltage adjustables speed d.c. power drive systems
IEC 61800-2, Adjustable speed electrical power drive systems – Part 2: General requirements –
Rating specifications for low voltage adjustable frequency a.c. power drive systems
2 Terms, definitions and symbols
2.1 Terms and definitions
For the purpose of this technical report the definitions given in IEC 61800-1, IEC 61800-2 and
IEC 60146-1-1 as well as the following, apply.
2.1.1
equilibrium temperature
steady-state temperature reached by a component of a converter under specified conditions of
load and cooling
NOTE Steady-state temperatures are in general different for different components. The times necessary to
establish the steady state are also different and proportional to thermal time constants.

TR 61800-6 © IEC:2003 – 11 –
2.1.2
current-time load chart
record of load current with respect to time
2.1.3
uniform load duty
duty for which a converter equipment carries a current of fixed value for an interval sufficiently
long for the components of the converter to reach equilibrium temperatures corresponding to
the said value of current. Figure 1 illustrates this type of load duty (see Table 1 for symbols).
θ I
j a
I
b
θ
j
t
IEC  884/03
Figure 1 – Typical current-time chart for uniform load duty
2.1.4
intermittent peak load duty
type of duty for which loads of high magnitude and short duration are applied following no-load
periods such that thermal equilibrium is reached between successive applications of the load.
Figure 2 illustrates this type of load duty. The intermittent loads need not be equidistant, but
the minimum value of t to achieve no-load semiconductor temperature before the next
intermittent load should be specified by the manufacturer.
θ I
j a
t
t
p
I
p
θ
j
t
IEC  885/03
Figure 2 – Typical current-time chart for intermittent peak load duty

TR 61800-6 © IEC:2003 – 13 –
2.1.5
intermittent load duty
type of duty for which intermittent loads are superimposed onto a constant base load such that
thermal equilibrium is reached between successive applications of the intermittent load.
Figure 3 illustrates this type of load duty. The intermittent loads need not be equidistant, but
the minimum value of t to achieve steady state semiconductor temperature before the next
b
intermittent load is applied should be specified by the manufacturer.
θ I
j a
t
b t
p
I
p
I
b
θ
j
t
IEC  886/03
Figure 3 – Typical current-time chart for intermittent load duty
2.1.6
intermittent load duty with no-load intervals
type of duty for which intermittent no-load intervals followed by high load intervals are
superimposed onto a constant base load, such that thermal equilibrium is reached between
successive applications of the intermittent load. Figure 4 illustrates this type of load duty. The
intermittent loads need not be equidistant, but the minimum value of t to achieve steady state
b
semiconductor temperature before the next intermittent load is applied should be specified by
the ma
...