IEC 60132-1A

SLOVENSKI STANDARD
SIST IEC 60255-16:1995
01-avgust-1995
Electrical relays - Part 16: Impedance measuring relays
Electrical relays - Part 16: Impedance measuring relays
Relais électriques - Seizième partie: Relais de mesure d'impédance
Ta slovenski standard je istoveten z: IEC 60255-16
ICS:
29.120.70 Releji Relays
SIST IEC 60255-16:1995 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------

SIST IEC 60255-16:1995

---------------------- Page: 2 ----------------------

SIST IEC 60255-16:1995
CEI
NORME
INTERNATIONALE IEC
255-16
INTERNATIONAL
Première édition
STAN DARD
First edition
1982
Relais électriques
Seizième partie:
Relais de mesure d'impédance
Electrical relays
Part 16:
Impedance measuring relays
de reproduction réservés — Copyright — all rights reserved
© CEI 1982 Droits
Aucune partie de cette publication ne peut être reproduite ni No part of this publication may be reproduced or utilized in
utilisée sous quelque forme que ce soit et par aucun pro- any form or by any means, electronic or mechanical,
including photocopying and microfilm, without permission
cédé, électronique ou mécanique, y compris la photocopie et
les microfilms, sans l'accord écrit de l'éditeur. in writing from the publisher.
Bureau Central de la Commission Electrotechnique Internationale 3, rue de Varembé Genève, Suisse
Commission Electrotechnique Internationale CODE  PRIX
International Electrotechnical Commission PRICE CODE Iv
aponHaa 3neKrporeHVectart xH KOMH RCCH
Met yu I EC.
voir catalogue en vigueur
Pour prix, •
For price, see current catalogue

---------------------- Page: 3 ----------------------

SIST IEC 60255-16:1995
255-16 Oc IEC 1982 - 3 -
CONTENTS
Page
FOREWORD 5
PREFACE 5
SECTION ONE - GENERAL AND DEFINITIONS
Clause
1. Scope

7
2. Definitions
2.1 Source impedance Z S 7
2.2 Steady-state characteristic 9
2.3 Dynamic characteristic 9
2.4 Transient characteristic 9
SECTION Two - REQUIREMENTS
3. Standard values 9
9
3.1 Input and auxiliary energizing quantities and frequency
3.2 Characteristic quantity 9
9
3.3 Specified times
3.4 Standard reference values of influencing quantities and factors and standard values of their nominal and
extreme ranges 9
11
3.5 Values of the limits of the operative range of the auxiliary energizing quantities
13
4. Methods of presenting relay characteristics and performance
13
4.1 Operating characteristics
4.2 Resetting characteristics 15
4.3 Operating times 15
15
4.4 Resetting times
5. Thermal requirements 15
6. Accuracy 17
7. Mechanical requirements 17
8. Rated burden 17
17
9. Shock and vibration
10. Contact performance 17
11. Insulation requirements 17
12. Marking and data 17
13. High-frequency disturbance tests 19
SECTION THREE - TEST METHODS
19
14. General requirements
15. Test circuits and methods for determining relay characteristics, performan ce and accuracy 19
15.1 Tests for determining steady-state characteristics 19
21
15.2 Tests for determining the dynamic characteristics and operating times
16. Tests for thermal requirements 21
17. Tests for mechanical requirements 21
FIGURES 22

---------------------- Page: 4 ----------------------

SIST IEC 60255-16:1995
255-16 © IEC 1982 — 5
INTERNATIONAL ELECTROTECHNICAL COMMISSION
ELECTRICAL RELAYS
Part 16: Impedance measuring relays
FOREWORD
1) The formal decisions or agreements of the IEC on technical matters, prepared by Technical Committees on which all the
National Committees having a special interest therein are represented, express, as nearly as possible, an international
consensus of opinion on the subjects dealt with.
2) They have the form of recommendations for international use and they are accepted by the National Committees in that
sense.
3) In order to promote inte rnational unification, the I EC expresses the wish that all National Committees should adopt the
text of the I EC recommendation for their national rules in so far as national conditions will permit. Any divergence
between the IEC 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 41B: Measuring Relays and Protection Equipment, of IEC Technical
Committee No. 41: Electrical Relays.
Drafts were discussed at the meetings held in Nice in 1976, in Milan in 1977 and in Helsinki in 1979. As a result of this
meeting, a draft, Document 41 B(Central Office)24, was submitted to the National Committees for approval under the Six
Months' Rule in April 1980.
The National Committees of the following countries voted explicitly in favour of publication:
Austria Romania
Belgium South Africa (Republic of)
Egypt Spain
France  Sweden
Germany * Switzerland
Ireland Turkey
Israel United Kingdom
Japan United States of America
Norway Yugoslavia
Poland
* The German National Committee cast a positive vote for publication with the exception, however, of Clause 11: Insulation
requirements.
Publications of Technical Committee No.41 are classified on a hierarchical basis:
First level: General standards.
Second level: Generic standards relating wholly or partly to a family of relays.
Third level: Standards applicable wholly or partly to a particular group of relays.
Fourth level: Particular requirements or specifications relating to a specific type (or pattern) of relay.
This standard is a third level publication.
Other IEC publications quoted in this standard:
Publications Nos. 50 (131): International Electrotechnical Vocabulary (I.E.V.), Chapter 131: Electric and magnetic
circuits.
255-0-20: Electrical Relays. Contact Performance of Electrical Relays.
255-5: Part 5: Insulation Tests for Electrical Relays.
255-6: Part 6: Measuring Relays with More than One Input Energizing Quantity.
255-6A: First Supplement to Publication 255-6.
255-12: Part 12: Directional Relays and Power Relays with Two Input Energizing Quantities.

---------------------- Page: 5 ----------------------

SIST IEC 60255-16:1995
255-16 © IEC 1982 — 7 —
ELECTRICAL RELAYS
Part 16: Impedance measuring relays
SECTION ONE —
GENERAL AND DEFINITIONS
1. Scope
This standard specifies the general requirements for impedance measuring relays. These
relays constitute a particular sub-family of measuring relays with more than one input
energizing quantity as defined in IEC Publication 255-6, Part 6: Measuring Relays with More
than One Input Energizing Quantity.
This standard specifies test methods and methods of presenting relay characteristics and
performance. It covers multi-input energizing quantity measuring relays in which impedance is
a characteristic quantity and for which the operating characteristics are defined in the
R—X
plane.
This standard applies to independent or dependent specified time relays.
Relays coming within the scope of IEC Publication 255-12, Part 12: Directional Relays and
Power Relays with Two Input Energizing Quantities, are excluded.
All tests in this standard are type tests.
This standard applies only to relays in new condition.
Notes 1. —
The term relay includes all the additional components which are necessary for its operation and which are
tested with it.
2. —
The voltage(s) and/or current(s) contributing to the measurement of the impedance can be either simple
quantities or combinations of more than one voltage and/or more than one current, for example the
difference of two phase-to-ground voltages, the sum of a phase current and residual current, etc. To obtain
specific operating characteristics which may have special properties (e.g. directional) the energizing
quantities may be mixed or additional input quantities may be brought into the relay.
2. Definitions
For definitions of general terms not defined in this standard, reference should be made to
the IEC Inte rn
ational Electrotechnical Vocabulary (I.E.V.), to IEC Publication 255-6, and to
IEC Publication 255-6A: First Supplement to IEC Publication 255-6 (1978).
For the purpose of this standard, the following definitions shall apply:
2.1
Source impedance Z,,
For a particular fault location, the source impedance is the impedance in the equivalent
circuit of the fault current path between the point where the voltage is applied to the
measuring relay and the e.m.f. in the equivalent circuit producing the fault current in the same
path.
Note. —
Where necessary, the source impedance takes into account its positive, negative and zero sequence
components.

---------------------- Page: 6 ----------------------

SIST IEC 60255-16:1995
255-16 © I E C 1982 9 —
2.2 Steady-state characteristic
The characteristic resulting from a slow change in the value of at least one of the input
energizing quantities.
2.3 Dynamic characteristic
The characteristic resulting from a sudden change in the value of at least one of the input
energizing quantities, including the effect of any aperiodic component.
2.4 Transient characteristic
The characteristic resulting from transient variations in the value of the input energizing
quantities such as magnetizing in-rush current, travelling waves, etc.
SECTION TWO — REQUIREMENTS
3. Standard values
3.1 Input and auxiliary energizing quantities and frequency
The standard values of input and auxiliary energizing quantities and of frequency are
specified in IEC Publication 255-6.
3.1.1 Effective range of input energizing quantities
There are no standard effective ranges of input energizing quantities. These shall be declared
by the manufacturer.
3.1.2 Operative ranges of auxiliary energizing quantities
The standard values of operative ranges of auxiliary energizing quantities are specified in
I E C Publication 255-6A.
3.2 Characteristic quantity
There are no standard values of the characteristic quantity or of its setting range.
3.3 Specified times
There are no standard values of specified times.
3.4
Standard reference values of influencing quantities and factors and standard values of their
nominal and extreme ranges
3.4.1 Influencing quantities and factors
The standard reference conditions are given in Table I of IEC Publication 255-6. In
addition, the standard conditions specified in Table I of this standard apply to impedance
measuring relays.

---------------------- Page: 7 ----------------------

SIST IEC 60255-16:1995
— 11 —
255-16 © I E C 1982
TABLE I
Standard reference conditions and test tolerances of influencing quantities
and factors
Influencing quantity or factor Test tolerance
Reference condition
Input energizing voltage(s)
â
As declared by the manufacturer or as specified in national
° Input energizing currents)
standards unless specified in this standard or in lower
D
R level documents
0
a
0 c,
Phase angle between input
pa
.0
energizing quantities
N
^
Û 
F
0
ca 0
Û Zero, unless specified
in the clauses of this 5% of peak a.c. value
D.C. component in a.c., transient
standard (see note)
d • •;
4 D.C. component in a.c., transient Zero (see note) 5% of peak a.c_ value
d 0 a
Note. — In the special case of relays in which polyphase measurements are made on a single relay, the manufacturer or
national standard shall define which of the input quantities shall be under reference conditions.
3.4.2 Limits of the nominal ranges of the influencing quantities and factors
The standard values are specified in Table II of I EC Publication 255-6. In addition, the
standard values specified in Table II of this standard apply to impedance measuring relays.
3.5 Values of the limits of the operative range of the auxiliary energizing quantities
The standard values of the limits of the operative range of the auxiliary energizing quantities
are specified in the I EC Publication 255-6A.

---------------------- Page: 8 ----------------------

SIST IEC 60255-16:1995
255-16 © IEC 1982 — 13 —
TABLE II
Standard values of the limits of the nominal ranges of influencing quantities
and factors
Nominal range
Influencing quantity or factor
Input energizing voltage(s)
Input energizing current(s)
" Phase angle between input energizing quantities
b " a
cd a
As declared by the manufacturer or as specified
'r Frequency
in national standards
=
y N
*El
os Waveform
cC a
.c
U
D.C. component in a.c., steady state
D.C. component in a.c., transient
Voltage or current
As declared by the manufacturer or as specified
in national standards unless specified
Frequency
ez in this standard
Q
N
Waveform
"âo
cu 4)
a
A.C. component in d.c. (ripple) 0% to 12% of the rated d.c. value*
tt
.,
a
X
ti
D.C. component in a.c., steady state
As declared by the manufacturer or as specified
in national standards unless specified
in this standard
D.C. component in a.c., transient
* This value of tolerance is based on the new definition I.E.V. 131-03-14: Peak ripple factor.
4. Methods of presenting relay characteristics and performance
4.1 Operating characteristics
R — X plane, in graphical
The manufacturer shall declare the operating characteristics in the
form or by mathematical formulae. The operating characteristics shall be referred to the relay
impedance setting(s). The exact significance of the setting value shall be defined by the
manufacturer, i.e. whether it is in terms of the phase or loop impedance. The effect of
influencing quantities or factors such as source impedance, fault direction, type of fault,
voltage value, phase angle value, etc. shall also be shown graphically or shall be stated.
22 and 23.
Typical examples of characteristics used in practice are shown in Figure 1, pages

---------------------- Page: 9 ----------------------

SIST IEC 60255-16:1995
255-16 © IEC 1982 — 15 —
The manufacturer shall declare the temporary and steady output states of the relay when the
input voltage is zero, due to either an interruption or a short circuit, over the operating
current range of the relay.
If an impedance relay has current-dependent operating values, this influence can be shown
in graphical form for different settings with the input current as the varying influencing
quantity and at a constant phase angle de
...