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IEC 60152
Edition 2.0 2021-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
HORIZONTAL PUBLICATION
PUBLICATION HORIZONTALE
Designation of phase differences by hour numbers in three-phase AC systems
Désignation des déphasages par indices horaires des réseaux en courant
alternatif triphasés
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IEC 60152
Edition 2.0 2021-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
HORIZONTAL PUBLICATION
PUBLICATION HORIZONTALE
Designation of phase differences by hour numbers in three-phase AC systems
Désignation des déphasages par indices horaires des réseaux en courant
alternatif triphasés
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.020 ISBN 978-2-8322-9920-3
– 2 – IEC 60152:2021 © IEC 2021
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Hour numbers . 5
5 Phase difference . 6
Figure 1 – Illustration of hour number for three-phase transformer Dy11 . 6
Figure 2 – Examples of hour numbers representing phase differences . 7
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
DESIGNATION OF PHASE DIFFERENCES BY
HOUR NUMBERS IN THREE-PHASE AC SYSTEMS
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
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IEC 60152 has been prepared by IEC technical committee 3: Documentation, graphical symbols
and representations of technical information. It is an International Standard.
This second edition cancels and replaces the first edition published in 1963. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) the title has been updated to reflect the content of the document;
b) the concept of identifying conductors with hour number has been removed as the concept
is considered out of date and other means for identifying conductors exists;
c) definition of hour number (clock number) and phase difference introduced.
– 4 – IEC 60152:2021 © IEC 2021
The text of this International Standard is based on the following documents:
FDIS Report on voting
3/1490/FDIS 3/1516/RVD
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at /members_experts/refdocs. The main document types developed by IEC are
described in greater detail at /standardsdev/publications.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
DESIGNATION OF PHASE DIFFERENCES BY
HOUR NUMBERS IN THREE-PHASE AC SYSTEMS
1 Scope
This document specifies methods and rules for the designation of phase difference between
two items in a three-phase AC system. The designations are intended to be applied in the
technical documentation of industrial installations, equipment, and products, and also on
markings of equipment and products.
2 Normative references
There are no normative references in this document.
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1
hour number
clock number
designation of a phase difference between the same quantity of two items in an AC system
3.2
phase difference
φ
for two sinusoidal quantities of the same frequency in a given order, difference between their
initial phases with possible addition of a multiple of 2π so that the difference is greater than −π
and not greater than π
Note 1 to entry: For the quantities at´( ) A´cos(ωϑt+ ´ ) and at˝( ) A˝˝cos(ωϑt+ ) the phase difference is
0 0