IEC 60255-22-1:2007

IEC 60255-22-1
Edition 3.0 2007-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Measuring relays and protection equipment –
Part 22-1: Electrical disturbance tests – 1 MHz burst immunity tests

Relais de mesure et dispositifs de protection –
Partie 22-1: Essais d’influence électrique – Essais d’immunité à l’onde
oscillatoire amortie 1 MHz
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IEC 60255-22-1
Edition 3.0 2007-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Measuring relays and protection equipment –
Part 22-1: Electrical disturbance tests – 1 MHz burst immunity tests

Relais de mesure et dispositifs de protection –
Partie 22-1: Essais d’influence électrique – Essais d’immunité à l’onde
oscillatoire amortie 1 MHz
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
M
CODE PRIX
ICS 29.120.70 ISBN 2-8318-9331-3

– 2 – 60255-22-1 © IEC:2007
CONTENTS
FOREWORD.3

1 Scope and object .5
2 Normative references.5
3 Terms and definitions .5
4 Test severity levels .7
5 Test equipment.7
6 Test set-up .10
7 Test procedure .11
8 Criteria for acceptance.12
9 Test report.13

Figure 1 – Ports for measuring relays and protection equipment .7
Figure 2 – Common mode test between each independent port and earth .8
Figure 3 – Common mode test between each independent port and all other
independent ports coupled to earth.9
Figure 4 – Differential mode test.10
Figure 5 – Test set-up for communication ports with shielded and unshielded cables .12

Table 1 – Test voltages for the EUT ports.7
Table 2 – Criteria for acceptance.12

60255-22-1 © IEC:2007 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
MEASURING RELAYS AND PROTECTION EQUIPMENT –

Part 22-1: Electrical disturbance tests –
1 MHz burst immunity tests
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
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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 60255-22-1 has been prepared by IEC technical committee 95:
Measuring relays and protection equipment.
This third edition cancels and replaces the second edition published in 2005. This standard
constitutes a technical revision. The main differences with respect to the previous edition are:
– this document is based on IEC 61000-4-18;
– a capacitor was added for testing shielded communication lines when earthed at one end
only;
– the test procedure for communication ports is clarified;
– the length of the communication cable for testing is fixed at 10 m;
– connection to earth removed in Figure 4 for test generator terminal.

– 4 – 60255-22-1 © IEC:2007
The text of this standard is based on the following documents:
CDV Report on voting
95/204/CDV 95/218/RVC
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
A list of all parts of the IEC 60255 series, under the general title Measuring relays and
protection equipment, can be found on the IEC website.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
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.
60255-22-1 © IEC:2007 – 5 –
MEASURING RELAYS AND PROTECTION EQUIPMENT –

Part 22-1: Electrical disturbance tests –
1 MHz burst immunity tests
1 Scope and object
This part of IEC 60255 is based on IEC 61000-4-18, referring to that publication where
applicable, and specifies the general requirements for 1 MHz oscillatory wave immunity tests
for measuring relays and protection equipment for power system protection, including the
control, monitoring and process interface equipment used with the relays and protection
equipment.
The objective of the tests is to confirm that the equipment under test will operate correctly
when energised and subjected to repetitive damped oscillatory waves such as those originating
from closing or opening circuit breakers or disconnectors in high voltage substations or power
plants.
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.
The object of this standard is to state:
– definition of terms used;
– test severity levels;
– test equipment;
– test set-up;
– test procedure;
– criteria for acceptance;
– test report.
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 60255-6, Electrical relays – Part 6: Measuring relays and protection equipment
IEC 61000-4-18:2006, Electromagnetic Compatibility (EMC) – Part 4-18: Testing and
measurement techniques – Damped oscillatory wave immunity test
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

– 6 – 60255-22-1 © IEC:2007
3.1
auxiliary equipment
equipment necessary to provide the EUT with the signals required for normal operation and
equipment to verify the performance of the EUT
3.2
auxiliary power supply port
AC or DC auxiliary energising input of the EUT
3.3
burst
a sequence of a limited number of distinct pulses or an oscillation of limited duration.
[IEV 161-02-07]
3.4
communication port
interface with a communication and/or control system, using low energy signals, permanently
connected to the EUT
3.5
EUT
Equipment Under Test, which may be either a measuring relay or a protection equipment
3.6
functional earth port
a port on the EUT which is connected to earth for purposes other than electrical safety
3.7
input port
port through which the EUT is energised or controlled in order to perform its function(s), e.g.
current and voltage transformer, status (binary) inputs, etc.
[IEV 131-12-61, modified]
3.8
output port
port through which the EUT produces predetermined changes, e.g. contact, optocoupler,
analogue outputs, etc.
[IEV 131-12-62, modified]
3.9
port
particular interface of the EUT with the external electromagnetic environment (see Figure 1)
[IEC 61000-4-18, 3.10]
60255-22-1 © IEC:2007 – 7 –
Auxiliary power supply port Functional earth port
Output port
EUT
Input port Communication port
IEC  1978/07
Figure 1 – Ports for measuring relays and protection equipment
4 Test severity levels
The test voltages for the appropriate ports of the EUT are shown in Table 1.
Table 1 – Test voltages for the EUT ports
Test voltage (kV peak ± 10 %)
Oscillation frequency 1 MHz
Port under test Common mode test Differential mode test
Auxiliary power supply 2,5 1
Input and output (see note) 2,5 1
Communication 1 0
NOTE In more severe environments a differential test voltage of 2,5 kV may be required for current
and voltage transformer inputs.

The 1 MHz test is not applicable to functional earth port.
The 1 MHz test is not applicable to the communications port if interfacing with cables which are
not permanently connected, or whose total length according to the manufacturers functional
specification is always less than 3 m.
5 Test equipment
The test generator, characteristics and performance are specified in IEC 61000-4-18. The
coupling and decoupling networks shall be in accordance with the arrangements in Figures 2, 3
and 4 of this part of IEC 60255.

– 8 – 60255-22-1 © IEC:2007
Test
generator
Coupling/
decoupling
network
Auxiliary
equipment
C C
EUT
L
L
L
L
L
L
L
L
Insulating support
Ground reference plane
IEC  1979/07
Key
L high-frequency blocking inductor, 1,5 mH
C high-frequency coupling capacitor, 0,5 μF
1, 2, 3, 4 EUT input and output ports
Figure 2 – Common mode test between each independent port and earth

60255-22-1 © IEC:2007 – 9 –
Test
generator
Coupling/
decoupling
network
Auxiliary
C C C C
equipment
EUT
C C C C
L
L
L
L
L
L
L
L 4
Insulating support
Ground reference plane
IEC  1980/07
Key
L high-frequency blocking inductor, 1,5 mH
C high-frequency coupling capacitor, 0,5 μF
1, 2, 3, 4 EUT input and output ports
Figure 3 – Common mode test between each independent port
and all other independent ports coupled to earth

– 10 – 60255-22-1 © IEC:2007
Test
generator
Coupling/
decoupling
network
Auxiliary
C C
equipment
EUT
L
L
L
L
L
L
L
L
Insulating support
Ground reference plane
IEC  1981/07
Key
L high-frequency blocking inductor, 1,5 mH
C high-frequency coupling capacitor, 0,5 μF
1, 2, 3, 4 EUT input and output ports
Figure 4 – Differential mode test
6 Test set-up
The general test set-up is specified in IEC 61000-4-18.
All auxiliary equipment used to provide the EUT with signals for normal operation, and to verify
the correct operation of the EUT, shall be decoupled, so that the test voltage does not affect
the auxiliary equipment.
The length of leads between the test generator and the coupling/decoupling network shall be
as short as possible. The test leads used between the EUT and the coupling/decoupling
network shall not be longer than 2 m.
The EUT and test leads shall be placed on an insulating support 0,1 m above the ground
reference plane. The minimum distance between the EUT and all other conductive structures

60255-22-1 © IEC:2007 – 11 –
(for example the walls of a shielded room) except the ground reference plane beneath the
EUT, shall be 0,5 m.
The EUT shall be tested in its case with the cover in position.
Where the EUT is exclusively mounted in a cubicle, the tests may be conducted with the EUT
in the cubicle. The cubicle, test leads and interconnecting cables shall be placed on an
insulating support, 0,1 m above the ground reference plane.
All parts of the EUT intended to be earthed, shall be earthed.
The test set-up for common and differential mode tests are shown in Figures 2, 3 and 4. For
communication ports, the length of shielded or unshielded cable between EUT1 and EUT2,
tested according to Figure 5, shall be 10 m.
For cables with only one end of the screen earthed, the unearthed end of the screen shall be
connected to the case of the EUT through a 0,5 μF coupling capacitor.
7 Test procedure
The tests shall be carried out at the reference conditions given in IEC 60255-6.
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 equal to rated values. The values of the input energising quantities shall be within twice
the assigned error of the transitional state both below and above the operating value.
The test voltage shall be applied as follows:
a) between each independent port and earth (common mode), connected as in Figure 2;
b) between each independent port and all other independent ports coupled to earth where
applicable (common mode), connected as in Figure 3;
c) between terminals of the same port where applicable (differential mode), connected as in
Figure 4;
d) between the cable connections of communication ports and earth (common mode),
connected as in Figure 5. The test shall be applied to individual communication cables, i.e.
one cable tested at a time. The exception to this is where more than one cable is required
to ensure correct operation of a communication circuit of the EUT. In such a case the
minimum number of cables to ensure correct operation of the communication circuit shall
be tested.
Independent ports shall be stated by the manufacturer and included in the test report.
The test voltage shall be applied separately with both polarities, for each combination of ports
for a period of at least 2 s.
Where the operating time of the EUT is longer than 2 s, the test voltage shall be applied for a
period longer than the actual operating time of the EUT.
The minimum time interval between two successive tests shall be 1 s.

– 12 – 60255-22-1 © IEC:2007
Test
generator
EUT2 EUT1
Cable 1 (shielded)
0,5 μF
Cable 2 (shielded)
Cable 3 (unshielded)
10 m
Insulating support Insulating support
Ground reference plane
IEC  1982/07
F
...