EN 60618:1997

SLOVENSKI STANDARD
01-september-2000
Induktivni napetostni delilniki (IEC 60618:1978 + A1:1981)
Inductive voltage dividers
Induktive Spannungsteiler
Diviseurs de tension inductifs
Ta slovenski standard je istoveten z: EN 60618:1997
ICS:
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.

NORME CEI
INTERNATIONALE IEC
INTERNATIONAL
Première édition
STAN DARD
First edition
1978-01
inductifs
Diviseurs de tension
Inductive voltage dividers
de reproduction réservés — Copyright - all rights reserved
© CEI 1978 Droits
de cette publication ne peut être reproduite ni No part of this publication may be reproduced or utilized
Aucune partie
sous quelque forme que ce soit et par aucun procédé, in any form or by any means, electronic or mechanical,
utilisée
y compris la photocopie et les including photocopying and microfilm, without permission
électronique ou mécanique,
de l'éditeur. in writing from the publisher
microfilms, sans l'accord écrit
Bureau central de la Commission Electrotechnique Internationale 3, rue de Varembé Genève Suisse
CODE PRIX
Commission Electrotechnique Internationale
R
PRICE CODE
International Electrotechnical Commission
IEC
Messi,nyHapokulaa 3nenrporexHHVecnan HoMHCCHa
Pour prix, voir catalogue en vigueur
• •
For price, see current catalogue

- 3 -
CONTENTS
Page
FOREWORD 5
PREFACE 5
Clause
1. Scope 7
2. Terms and definitions
2.1 Inductive voltage divider 7
2.2 Transfer ratio 7
2.3 Fiducial value 7
2.4 Transfer ratio error
2.5 Input impedance 9
2.6 Output impedance 9
2.7 Influence quantity
2.8 Variation
2.9 Reference conditions
2.10 Nominal range of use
2.11 Limiting values of an influence quantity
2.12 Circuit insulation voltage (nominal circuit voltage) 11
2.13 Common mode voltage
2.14 D.C. series mode input current
2.15 Distortion factor
2.16 Electrostatic screen
2.17 Leakage current screen
2.18 Resolution
2.19 Auxiliary equipment
2.20 Accuracy
3. Classification 15
4. Limits of intrinsic error
4.1 Permissible limits of intrinsic error
4.2 Selectable ratios 15
5. Conditions for the determination of intrinsic errors 19
6. Permissible variations
6.1 Limits of variations
6.2 Conditions for the determination of the variations
6.3 Variation due to d.c. series mode current 23
6.4 Variation due to the influence of an externally produced magnetic field
7. Additional electrical and mechanical requirements
7.1 Limiting values of input voltage
7.2 Input voltage switching
7.3 Voltage test and other safety requirements
7.4 Insulation resistance test
7.5 Limiting conditions for storage, transport and use
8. Information, markings and symbols
8.1 Information
8.2 Markings, symbols and their locations
8.3 Documentation
8.4 Example of the marking of an IVD
A - Transfer ratio and other performance characteristics 33
APPENDIX
FIGURES
INTERNATIONAL ELECTROTECHNICAL COMMISSION
INDUCTIVE VOLTAGE DIVIDERS
FOREWORD
The formal decisions or agreements of the I E C on technical matters, prepared by Technical Committees on which all the
1)
National Committees having a special interest therein are represented, express, as nearly as possible, an international
consensus of opinion on the subjects dealt with.
They have the form of recommendations for international use and they are accepted by the National Committees in that
2)
sense.
tional Committees should adopt the
3) In order to promote international unification, the I E C expresses the wish that all Na
text of the I E C recommendation for their national rules in so far as national conditions will permit. Any divergence
between the I E C recommendation and the corresponding national rules should, as far as possible, be clearly indicated in
the latter.
PREFACE
This standard has been prepared by Sub-Committee 13B, Electrical Measuring Equipment, of
I E C Technical Committee No. 13, Electrical Measurements.
Drafts were discussed at the meetings held in The Hague in 1975 and in Warsaw in 1976. As a
result of this latter meeting, the draft, Document 13B(Central Office)55, was submitted to the
National Committees for approval under the Six Months' Rule in November 1976.
publication:
The following countries voted explicitly in favour of
Japan
Argentina
Poland
Australia
Belgium Romania
South Africa (Republic of)
Canada
Sweden
Denmark
Switzerland
Egypt
Turkey
Finland
Germany Union of Soviet Socialist Republics
Hungary United Kingdom
United States of America
Italy
Other IEC publications quoted in this standard:
Publications Nos. 27: Letter Symbols to be Used in Electrical Technology.
51: Recommendations for Direct Acting Indicating Electrical Measuring Instruments and Their
Accessories.
160: Standard Atmospheric Conditions for Test Purposes.
186: Voltage Transformers.
414: Safety Requirements for Indicating and Recording Electrical Measuring Instruments and Their
Accessories.
— 7 —
INDUCTIVE VOLTAGE DIVIDERS
. Scope
This standard applies to inductive voltage dividers which are designed to provide a number
of accurate ratios of alternating voltage over a range of frequencies and are intended to be
used with negligible burden on their output.
Transformer devices intended to supply a burden for measurement purposes are covered by IEC
Notes 1. —
Publication 186, Voltage Transformers.
2. — In some multi-dial inductive voltage dividers, the setting circuit of the last (least significant) dial is
resistive.
This standard does not apply to any auxiliary equipment used with inductive voltage
dividers.
2. Terms and definitions
For the purposes of this standard, the following definitions apply:
"IVD")
2.1 Inductive voltage divider (for brevity, in this standard, referred to as
A device comprising one transformer or more than one interconnected transformers which,
by means of switches or otherwise, can be set to provide output voltages equal to a selected
proportion of the input voltage.
Notes 1. — Such IVDs include devices which are referred to as "precision autotransformers", "decade transformer
dividers", "inductive dividers" and "ratio transformers".
2. — The main characteristics of IVDs are discussed in Appendix A.
Some IVDs have a separate auxiliary winding (the magnetizing winding) which supplies the magnetization
3. —
and losses of the magnetic core. Use of this winding greatly increases the input impedance of the
measuring winding and reduces the errors of the IVD. These IVDs are called "2-stage IVDs".
2.2 Transfer ratio
The ratio of the complex value representing the open circuit output voltage (phasor) of an
IVD to the complex value representing its input voltage (phasor).
2.2.1
Nominal transfer ratio
The ratio between the open circuit output voltage and the input voltage indicated either by
the setting(s) of the switch(es) or by some other method of selecting the ratio.
Note. — This ratio is a pure number obtained by reading the instrument dials or similar indication.
2.3 Fiducial value
A value to which reference is made in order to specify the accuracy of an IVD.
The fiducial value for an IVD is unity, i.e. the ratio which corresponds (or which would
correspond) to an open circuit output voltage equal to the input voltage.

— 9 —
2.4 Transfer ratio error
The value obtained by subtracting the true value of the transfer ratio from the value of the
nominal transfer ratio.
Notes 1. When the transfer ratio error is expressed as a proportion of the fiducial value, its numerical value
remains unchanged, as the fiducial value is a ratio of unity.
2. — Although the transfer ratio error is complex, containing both an in-phase (e5) and a quadrature (eq)
(e)
component, for the purpose of this standard, only the modulus of this , complex quantity is used.
The modulus of the transfer ratio error is expressed mathematically by:
e = ep 2 + eq 2 (see Appendix A, Clause A7).
V
3. The modulus of the transfer ratio error is expressed in per cent (%), in parts per million (ppm) or in
proportional parts using scientific notation, of the fiducial value (see Clause 3 and Table I).
2.4.1 Intrinsic transfer ratio error
Transfer ratio error determined under reference conditions.
2.5 Input impedance
2.5.1 Input impedance of the measuring winding
Under specified conditions, the impédance presented to the source by an IVD when its
output terminals are open circuited. For an IVD with a separate magnetizing winding
("2 stage"), this is the impedance at the measuring input terminals when the magnetizing
winding is energized by a voltage of the same amplitude and phase as the voltage at the
measuring input terminals.
Note. The impedance of the magnetizing winding is not part of the input impedance of the measuring winding.
2.5.2 Input impedance of the magnetizing winding
Under specified conditions, the impedance presented to the source by the magnetizing
winding of a 2-stage IVD when the measuring winding is energized by a voltage having the
same amplitude and phase as the voltage at the magnetizing winding terminals.
Note. — The impedance of the measuring winding is not part of the input impedance of the magnetizing winding.
2.6 Output impedance
Under specified conditions, the impedance presented to any load by an IVD when its input
terminals are connected together by a link of negligible impedance.
2.6.1 Maximum output resistance
The highest value of the resistive component of the output impedance at any setting of the
switch(es) or other ratio adjusting arrangement.
2.6.2 Maximum output inductance
The inductance which, at a particular frequency, produces the highest value of the reactive
component of the output impedance at any setting of the switch(es) or other ratio adjusting
arrangement.
— 11 —
2.7 Influence quantity
A quantity which is liable to cause unwanted variation in the transfer ratio of an IVD.
Generally, it covers such quantities as input voltage and frequency, ambient temperature and humidity.
Note. —
These quantities will have reference ranges and nominal ranges of use, which are given in the appropriate
tables.
2.8
Variation
fluence quantity
The difference between the true values of the transfer ratio when an in
assumes successively two different specified values, all other influence quantities remaining
within their reference conditions.
2.9 Reference conditions
The specified conditions under which the IVD is intended to comply with the requirements
concerning intrinsic transfer ratio errors. These conditions may have either of the following:
2.9.1 Reference value
A specified single value of an influence quantity at which, within the stated tolerance, the
IVD is intended to comply with the requirements concerning intrinsic transfer ratio errors.
2.9.2 Reference range
A specified range of values of an influence quantity within which the IVD is intended to
comply with the requirements concerning intrinsic transfer ratio errors.
2.10 Nominal range of use
A specified range of values which each influence quantity can assume without causing a
variation exceeding the specified limits.
2.11 Limiting values of an influence quantity
Extreme values which an influence quantity may assume without the IVD being damaged
or permanently altered in such a way that it no longer satisfies the requirements of its
accuracy class.
2.12 Circuit insulation voltage (nominal circuit voltage)
The highest voltage with respect to earth which may be applied to any circuit of an IVD
so that the IVD is unlikely to become dangerous to touch.
2.13 Common mode voltage
Any voltage which exists between the common input-output terminal(s) and the earth
terminal, the leakage current screen terminal or the electrostatic screen terminal (if any),
separately or collectively (as specified).
When the input and output circuits do not have a common point, the common mode voltage is defined
Note. —
between a specified terminal of each circuit and the earth terminal or screen terminal, according to the
method of connection specified.

— 13 —
2.14 D.C. series mode input current
The value of the direct current which enters the input terminals.
2.15
Distortion factor
The ratio of the r. m. s. value of the harmonic content . to the r. m. s. value of the non-
sinusoidal quantity.
2.16 Electrostatic screen
An electrically conductive enclosure or coating intended to protect the enclosed space from
external electrostatic influences.
2.17 Leakage current screen
A conductive path which prevents leakage currents to earth from affecting the results of
measurements.
The terminal of the leakage current screen is often called "guard terminal".
Note.
2.18 Resolution
The change of transfer ratio corresponding either to the smallest step or to the smallest
division on the lowest (least significant) dial.
2.19 Auxiliary equipment
Additional equipment, which is or is not an integral part of the IVD and is necessary to
enable the IVD to operate accurately and safely as specified.
2.20 Accuracy
The accuracy of an IVD is defined by the limits of the modulus of intrinsic transfer ratio
error and by the limits of variations of this modulus due to influence quantities (see
Appendix A, Clause A8).
Notes 1. — The accuracy is defined in terms of the modulus of the transfer ratio error (see Sub-clause 2.4) which is a
single descriptor representing, in a practical way, the effective error of the IVD.
2. —
The accuracy of an IVD can also be stated, in part, by the in-phase component of its transfer ratio error.
It is not defined in this way in this standard, and no requirements are given for it. However, when a
certificate is provided, it is useful to give the in-phase error component, which can be easily verified by
the user (see Sub-clause 8.1.2).
2.20.1 Accuracy class
A class of IVDs, the accuracy o
...