IEC TR 62711:2011

IEC/TR 62711 ®
Edition 1.0 2011-10
TECHNICAL
REPORT
Mnemonics and designations of symbols for measuring relays, instruments and
related device
IEC/TR 62711:2011(E)
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IEC/TR 62711 ®
Edition 1.0 2011-10
TECHNICAL
REPORT
Mnemonics and designations of symbols for measuring relays, instruments and
related device
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
T
ICS 01.080.40; 29.200 ISBN 978-2-88912-691-0

– 2 – TR 62711  IEC:2011(E)
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 6
3 Terms and definitions . 6
4 Measuring relay symbols . 6
5 Measuring instruments . 6
6 Mnemonics and designations for measuring relays and instruments . 7
6.1 Overview . 7
6.2 Measuring relays . 7
6.3 Power system measuring instruments. 17
Bibliography . 24

Figure 1 – The general symbol for a measuring relay in IEC 60617 . 5
Figure 2 – The general symbols for a measuring instrument in IEC 60617 . 5

Table 1 – Measuring relays – Prefix . 7
Table 2 – Measuring relays – Suffix . 7
Table 3 – Measuring relays – General . 8
Table 4 – Measuring relays – Current . 9
Table 5 – Measuring relays – Voltage . 10
Table 6 – Measuring relays – Frequency . 10
Table 7 – Measuring relays – Impedance . 11
Table 8 – Measuring relays – Power . 11
Table 9 – Measuring relays – Phase . 12
Table 10 – Measuring relays – Other quantities . 12
Table 11 – Measuring relays – Other fault phenomenon. 12
Table 12 – Measuring relays – Pilot wire relay . 13
Table 13 – Measuring relays – Carrier pilot relay . 13
Table 14 – Measuring relays – Microwave relay . 14
Table 15 – Measuring relays – Calculation type . 14
Table 16 – Measuring relays – Apparatus protection and control . 14
Table 17 – Measuring relays – Other type . 15
Table 18 – Measuring relays – Power system control . 17
Table 19 – Measuring instruments – Power system measuring instruments . 18

TR 62711  IEC:2011(E) – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
MNEMONICS AND DESIGNATIONS OF SYMBOLS FOR MEASURING
RELAYS, INSTRUMENTS AND RELATED DEVICE

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
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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.
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 62711, which is a technical report, was prepared by IEC technical committee 3: Information
structures, documentation and graphical symbols.
The text of this technical report is based on the following documents:
Enquiry draft Report on voting
3/1029A/DTR 3/1041/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.

– 4 – TR 62711  IEC:2011(E)
The committee has decided that the contents of this publication will remain unchanged until the
stability 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.
A bilingual version of this standard may be issued at a later date.

TR 62711  IEC:2011(E) – 5 –
MNEMONICS AND DESIGNATIONS OF SYMBOLS FOR MEASURING
RELAYS, INSTRUMENTS AND RELATED DEVICE

1 Scope
This Technical Report provides recommendations for consistent use of mnemonics and
qualifying symbols to be applied to symbols representing devices used in systems for monitoring,
protection, switching, and controlling of apparatus in electrical substations, generating stations,
power utilization and conversion facilities, and equipment designed for automatic protection of
power systems. The recommendations are intended for designers, manufacturers and
engineers of such systems.
For symbols of measuring relay and measuring instrument, it is intended to serve two purposes,
namely:
– Give a review of standardized designations (as defined in this report);
– Limit the range of possible variants (after final standardization and introduction in
IEC 60617).
Symbols for measuring relays are symbols in which the functional behaviour of an element,
mostly because of its complexity, is described by qualifying symbols e.g. IEC 60617-S00328
(2001-07), IEC 60617-S00337 (2001-07), particularly by referring to supporting documentation;
the relevant rules and explanations are to be found in IEC 60617 in the application notes
associated with the symbols, e.g. IEC 60617-S00327 (2001-07) (A00091 through A00094).
IEC 60617-S00327 (2001-07):
Measuring relay
Figure 1 – The general symbol for a measuring relay in IEC 60617
Symbols for indicating, recording or integrating instruments are symbols in which the functional
behaviour of an element is fully described by standardized means. The relevant rules and
explanations are to be found in IEC 60617 in the application notes associated with the symbols
IEC 60617-S00910 (2001-07), IEC 60617-S00911 (2001-07) and IEC 60617-S00912 (A00144
through A00147).
IEC 60617-S00910 (2001-07): IEC 60617-S00911 (2001-07): IEC 60617-S00912 (2001-07):
Indicating instrument Recording instrument Integrating instrument

Figure 2 – The general symbols for a measuring instrument in IEC 60617

– 6 – TR 62711  IEC:2011(E)
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 60617, Graphical symbols for diagrams
ISO/IEC 81714-1, Design of graphical symbols for use in the technical documentation of
products – Part 1: Basic rules
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
protection relay
measuring relay which, either solely or in combination with other relays, is a constituent of a
protection equipment
[IEC 60050-448:1995, 448-11-02]
4 Measuring relay symbols
Power system
...