Iec60076-1 (Ed2.1) en D PDF
Iec60076-1 (Ed2.1) en D PDF
Iec60076-1 (Ed2.1) en D PDF
STANDARD 60076-1
Edition 2.1
2000-04
Power transformers
This is a free 6 page sample. Access the full version online.
Part 1:
General
Reference number
IEC 60076-1:1993+A1:1999(E)
Publication numbering
As from 1 January 1997 all IEC publications are issued with a designation in the
60000 series. For example, IEC 34-1 is now referred to as IEC 60034-1.
Consolidated editions
The IEC is now publishing consolidated versions of its publications. For example,
edition numbers 1.0, 1.1 and 1.2 refer, respectively, to the base publication, the base
publication incorporating amendment 1 and the base publication incorporating
amendments 1 and 2.
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INTERNATIONAL IEC
STANDARD 60076-1
Edition 2.1
2000-04
Power transformers
This is a free 6 page sample. Access the full version online.
Part 1:
General
International Electrotechnical Commission, 3, rue de Varemb, PO Box 131, CH-1211 Geneva 20, Switzerland
Telephone: +41 22 919 02 11 Telefax: +41 22 919 03 00 E-mail: inmail@iec.ch Web: www.iec.ch
CONTENTS
Page
FOREWORD .......................................................................................................................... 7
Clause
3.5 Tappings............................................................................................................... 21
3.6 Losses and no-load current................................................................................... 25
3.7 Short-circuit impedance and voltage drop ............................................................. 25
3.8 Temperature rise .................................................................................................. 27
3.9 Insulation .............................................................................................................. 27
3.10 Connections.......................................................................................................... 27
3.11 Kinds of tests ........................................................................................................ 29
3.12 Meteorological data with respect to cooling ........................................................... 31
4 Rating ............................................................................................................................ 31
4.1 Rated power ......................................................................................................... 31
4.2 Loading cycle........................................................................................................ 33
4.3 Preferred values of rated power ............................................................................ 33
4.4 Operation at higher than rated voltage and/or at disturbed frequency.................... 33
5 Requirements for transformers having a tapped winding ................................................ 33
5.1 General Notation of tapping range ..................................................................... 33
5.2 Tapping voltage tapping current. Standard categories of tapping voltage
variation. Maximum voltage tapping ...................................................................... 35
5.3 Tapping power. Full-power tappings reduced-power tappings ............................ 41
5.4 Specification of tappings in enquiry and order ....................................................... 43
5.5 Specification of short-circuit impedance ................................................................ 43
5.6 Load loss and temperature rise ............................................................................. 45
6 Connection and phase displacement symbols for three-phase transformers ................... 45
7 Rating plates.................................................................................................................. 51
7.1 Information to be given in all cases ....................................................................... 51
7.2 Additional information to be given when applicable ............................................... 51
8 Miscellaneous requirements ........................................................................................... 53
8.1 Dimensioning of neutral connection ...................................................................... 53
8.2 Oil preservation system ........................................................................................ 53
8.3 Load rejection on generator transformers.............................................................. 55
9 Tolerances ..................................................................................................................... 55
60076-1 IEC:1993+A1:1999 5
Clause Page
10 Tests ............................................................................................................................. 59
10.1 General requirements for routine, type and special tests ....................................... 59
10.2 Measurement of winding resistance ...................................................................... 61
10.3 Measurement of voltage ratio and check of phase displacement ........................... 63
10.4 Measurement of short-circuit impedance and load loss ......................................... 63
10.5 Measurement of no-load loss and current ............................................................. 63
10.6 Measurement of the harmonics of the no-load current ........................................... 65
10.7 Measurement of zero-sequence impedance(s) on three-phase transformers ......... 65
10.8 Tests on on-load tap-changers.............................................................................. 67
11 Electromagnetic compatibility (EMC) .............................................................................. 67
POWER TRANSFORMERS
Part 1: General
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.
This is a free 6 page sample. Access the full version online.
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 International Standard may be the subject
of patent rights. The IEC shall not be held responsible for identifying any or all such patent rights.
This International Standard has been prepared by IEC by technical committee 14: Power
transformers.
This consolidated version of IEC 60076-1 consists of the second edition (1993) [documents
14(CO)75 and 14(CO)77], its amendment 1 (1999) [documents 14/344/FDIS and 14/345/RVD]
and its corrigendum of June 1997.
The technical content is therefore identical to the base edition and its amendment and has
been prepared for user convenience.
A vertical line in the margin shows where the base publication has been modified by
amendment 1.
IEC 60076 consists of the following parts, under the general title: Power transformers.
Part 1:1993, General.
Part 2:1993, Temperature rise.
Part 3:1980, Insulation levels and dielectric tests.
Part 5:1976, Ability to withstand short circuit.