IEC 60255-22-3:2007

INTERNATIONAL IEC
STANDARD
CEI
60255-22-3
NORME
Third edition
INTERNATIONALE
Troisième édition
2007-07
Measuring relays and protection equipment –
Part 22-3:
Electrical disturbance tests –
Radiated electromagnetic field immunity

Relais de mesure et dispositifs de protection –
Partie 22-3:
Essais d’influence électrique –
Immunité aux champs électromagnétiques
rayonnés
Reference number
Numéro de référence
IEC/CEI 60255-22-3:2007
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INTERNATIONAL IEC
STANDARD
CEI
60255-22-3
NORME
Third edition
INTERNATIONALE
Troisième édition
2007-07
Measuring relays and protection equipment –
Part 22-3:
Electrical disturbance tests –
Radiated electromagnetic field immunity

Relais de mesure et dispositifs de protection –
Partie 22-3:
Essais d’influence électrique –
Immunité aux champs électromagnétiques
rayonnés
PRICE CODE
M
CODE PRIX
Commission Electrotechnique Internationale
International Electrotechnical Commission
МеждународнаяЭлектротехническаяКомиссия
For price, see current catalogue
Pour prix, voir catalogue en vigueur

– 2 – 60255-22-3 © IEC:2007
CONTENTS
FOREWORD.3

1 Scope and object .5
2 Normative references.5
3 Terms and definitions .6
4 Test severity level.6
5 Test equipment.6
6 Test set-up .6
7 Test procedure .7
7.1 Frequency sweep.7
7.2 Spot frequencies.8
8 Criteria for acceptance.8
9 Test report.9

Bibliography .12

Figure 1 – Example of a test set-up for floor standing equipment .10
Figure 2 – Example of a test set-up for single equipment .11

Table 1 – Spot frequencies.8
Table 2 – Criteria for acceptance.9

60255-22-3 © IEC:2007 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
_____________
MEASURING RELAYS AND PROTECTION EQUIPMENT –

Part 22-3: Electrical disturbance tests –
Radiated electromagnetic field immunity

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
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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.
International Standard IEC 60255-22-3 has been prepared by IEC technical committee 95:
Measuring relays and protection equipment.
This third edition cancels and replaces the second edition published in 2000. The main change
with respect to the previous edition concerns the extension of the frequency range to be tested.
The text of this standard is based on the following documents:
FDIS Report on voting
95/209/FDIS 95/215/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.

– 4 – 60255-22-3 © IEC:2007
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts of IEC 60255 series, published under the general title Measuring relays and
protection equipment, can be found on the IEC website.
The committee has decided that the contents of this publication will remain unchanged until the
maintenance result 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.
60255-22-3 © IEC:2007 – 5 –
MEASURING RELAYS AND PROTECTION EQUIPMENT –

Part 22-3: Electrical disturbance tests –
Radiated electromagnetic field immunity

1 Scope and object
This part of IEC 60255 is based on IEC 61000-4-3, referring to that publication where
applicable, and specifies the general requirements for radiated electromagnetic field immunity
tests for measuring relays and protection equipment for power system protection, including the
control, monitoring and process interface equipment used with those systems.
The objective of the tests is to confirm that the equipment under test (EUT) will operate
correctly when energised and subjected to an electromagnetic field from a radiation source
operating within the frequency range 80 MHz to 2,7 GHz.
NOTE 1 The product standard IEC 60255-22-6 (based on IEC 61000-4-6) establishes the immunity of measuring
relays and protection equipment over the frequency range of 0,15 MHz to 80 MHz.
NOTE 2 The test methods defined in this standard are structured for the primary objective of establishing
adequate repeatability of results at various test facilities for qualitative analysis of effects. The test methods using a
portable transmitter are not taken into consideration here because the EMC directive now specifies a sweep test,
calibrated field strengths must be used and the portable transmitter test is not generally reproducible.
The requirements specified in this standard are applicable to measuring relays and protection
equipment in a new condition, and all tests specified are type tests only.
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 60050(161), International Electrotechnical Vocabulary (IEV) – Chapter 161:
Electromagnetic compatibility
IEC 60050(446), International Electrotechnical Vocabulary (IEV) – Chapter 446: Electrical
relays
IEC 60050(448), International Electrotechnical Vocabulary (IEV) – Chapter 448: Power system
protection
IEC 60255-6, Electrical relays – Part 6: Measuring relays and protection equipment
IEC 61000-4-3, Electromagnetic compatibility (EMC) – Part 4-3: Testing and measurement
techniques – Radiated, radio-frequency, electromagnetic field immunity test
___________
Specified in the first edition (1989) of this standard.

– 6 – 60255-22-3 © IEC:2007
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60050(161),
IEC 60050(446) and IEC 60050(448), and the following apply.
3.1
auxiliary equipment
equipment necessary to provide the EUT with the signals required for normal operation, and
equipment used to verify the performance of the EUT
3.2
equipment under test
EUT
equipment which may be either a measuring relay or a protection equipment
3.3
port
particular interface of the EUT with electromagnetic environment
[IEV 131-12-60, modified and IEC 61000-4-12, 3.7, modified]
4 Test severity level
The field strength, prior to modulation being applied, shall be 10 V/m, measured in accordance
with IEC 61000-4-3.
NOTE This level of field strength is applicable to equipment used in a severe electromagnetic radiation
environment, for example levels typical of transceivers that can be operated close to the equipment, but not closer
than 1 m.
5 Test equipment
The recommended test equipment is described in IEC 61000-4-3. This includes a description of
the test facility and calibration of the field.
6 Test set-up
The general test set-up should be as specified in IEC 61000-4-3. Specific details for measuring
relays and protection equipment are as follows.
Where possible, it is recommended that all auxiliary equipment should be located outside the
boundary of the test site.
Normally, the EUT shall be individually tested, with the EUT placed on a non-conducting table
0,8 m above the ground plane. All parts of the EUT shall be at least 0,8 m from any metal
surface.
Where the EUT is exclusively mounted in a cubicle, the tests may be conducted with the EUT
in the cubicle. The cubicle should be placed on a non-conducting support, and for practical
reasons a distance of approximately 0,1 m is recommended between the cubicle and the
ground plane.
Where earth connections are required for safety purposes, they shall be connected to the
ground plane. Where they are not otherwise provided or specified by the manufacturer, earth
connections shall be, where practicable, 1 m long and shall run parallel to, and at a distance of
not more than 0,1 m from, the auxiliary power supply connection.

60255-22-3 © IEC:2007 – 7 –
Earth connections for functional purposes (e.g. for EMC) either specified or supplied by the
manufacturer for connection to the same terminal as the safety earth connection shall also be
connected to the ground plane. The length of these connections shall be as short as possible.
Interconnecting cables shall be as follows:
• the manufacturer’s specified wiring types and connectors shall be used;
• if the manufacturer’s specification requires a wiring length of less than or equal to 3 m, then
the specified length shall be used;
• if the specified length is greater than 3 m, or is not specified, then the length exposed to the
electromagnetic field shall be 1 m. The remainder is decoupled, for instance via lossy radio
frequency ferrite tubes or low-inductive bundling of the cable. The decoupling method shall
not impair the operation of the EUT.
The length of exposed wiring is run in a configuration which essentially simulates normal
wiring, i.e. the wiring is run to the side of the EUT and then either up or down.
Typical EUT set-ups for measuring relays and protection equipment are shown in Figures 1
and 2, which are based on the equivalent figures of IEC 61000-4-3.
7 Test procedure
The tests shall be carried out under the reference conditions given in IEC 60255-6.
The tests shall be performed with the antenna facing each side of the EUT. When technically
justified, the EUT can be tested by exposing fewer sides to the generating antenna. The
polarisation of the field generated by the antenna necessitates testing each side twice, once
with the antenna positioned vertically, and once with the antenna positioned horizontally.
For practical reasons, the effect of this disturbance on the relay in its transitional or operate
state is only considered at certain spot frequencies as specified in 7.2.
The following tests are to be performed to confirm that
a) the EUT will have normal performance within the specification limits when energised and
subjected to an electromagnetic field from a radiation source operating within the swept
frequency ranges 80 MHz to 1 GHz and 1,4 GHz to 2,7 GHz;
b) the EUT is capable of correct operation and reset in the presence of an electromagnetic
field from a radiation source at given spot frequencies within the range 80 MHz to 2,7 GHz.
7.1 Frequency sweep
Time delay settings of the EUT shall be set to their minimum practical values as defined by
their intended application.
The tests shall be carried out with auxiliary energising quantities applied to the appropriate
circuits, using input energising quantities equal to rated values. The values of the input
energising quantities shall be within twice the assigned error of the transitional state.
If the rated conditions of the EUT mean that the input energising quantity is much lower than
the relay operate value, the tests shall be performed at the continuous thermal withstand value.

– 8 – 60255-22-3 © IEC:2007
The frequency range is swept from 80 MHz to 1 GHz and 1,4 GHz to 2,7 GHz, with the signal
80 % amplitude-modulated with a 1 kHz sinewave, pausing to adjust the radio frequency signal
level or to switch oscillators and antennas as necessary. The rate of sweep shall not exceed
–3
1,5 × 10 decades per second.
Where the frequency range is swept incrementally, the step size shall not exceed 1 % of
fundamental, with linear interpolation between calibrated points. The dwell time at each
frequency shall be 0,5 s. In those cases where the EUT operate time is greater than 0,5 s, the
dwell time shall be increased until operation of the EUT is possible.
NOTE The expression “not exceed 1 % of fundamental” means that the frequency of each step is less than, or
equal to, the frequency of the previous step after multiplication by a factor of 1,01 (for a 1 % step size).
7.2 Spot frequencies
The tests shall be carried out with auxiliary energising quantities applied to the appropriate
circuits with values equal to rated conditions.
Table 1 specifies the spot frequencies which shall be used.
Table 1 – Spot frequencies
Spot frequency Modulation
Test MHz Tolerance (1 kHz sinewave) Duty cycle
1 80 80 % 100 %
±0,5 %
2 160 ±0,5 % 80 % 100 %
3 380 80 % 100 %
±0,5 %
4 450 ±0,5 % 80 % 100 %
5 900 80 % 100 %
±5 MHz
6 1 850 80 % 100 %
±5 MHz
7 2 150 80 % 100 %
±5 MHz
During each spot frequency test, the input energising quantities shall be adjusted to cause the
EUT to change from the normal energised state to the operated state, and held until the EUT
operates correctly. The input energising quantities shall then be re-adjusted to cause the
EUT to reset.
The testing time at each spot frequency should be not less than 10 s.
8 Criteria for acceptance
The test result is positive if the EUT shows its immunity throughout the entire period of the
application of the tests.
Table 2 lists the important functions which could apply to a measuring relay or protection
equipment. These should be monitored during both sweep and spot frequency testing.

60255-22-3 © IEC:2007 – 9 –
Table 2 – Criteria for acceptance
Function Criterion for acceptance
Protection
Command and control
Measurement Normal performance within the specification limits
Integral human-machine interface and visual alarms
Data communication
9 Test report
The test report shall include those items listed in the standard IEC 60255-6 and also the
following:
• the identification and configuration of the EUT;
• the test conditions;
• the mounting and orientation of the EUT;
• the distance between the EUT and the antenna;
• the type(s) and number of interconnecting wires used and the interface port (of the EUT) to
which these are connected;
• the operating conditions of the EUT, for example relay settings and values of input
energising quantities;
• the rate of sweep frequency, dwell time, frequency steps;
• the test severity level;
• the spot frequencies;
• the test equipment used;
• the EUT exercising method used in the spot frequency test;
• the test conclusion (pass/fail).

– 10 – 60255-22-3 © IEC:2007
Chamber wall
Equipment
under test
Area of
Shielded connections
uniform field
through chamber wall
Cable length
1 m
Non-conducting support Power cable
filter
Field generation
antenna
Shielded
Absorbing ferrite
power cable
or EMI filter
0,1 m
Shielded
signal cable
Optional anechoic material used
in semi-anechoic chamber to
reduce floor reflections
IEC  1152/07
NOTE Anechoic material has been omitted from walls for clarity.
Figure 1 – Example of a test set-up for floor standing equipment

60255-22-3 © IEC:2007 – 11 –
Chamber wall
Area of uniform
field
Equipment
Non-conducting table under test
Absorbing ferrite or EMI filter
for power cables
Wiring >3 m
...