CEI EN 60255-26

General

This part of the IEC 60255 series is applicable to measuring
relays and protection equipment, taking into account combinations
of devices to form schemes for power system protection including
the control, monitoring, communication and process interface
equipment used with those systems.

This standard specifies the requirements for electromagnetic
compatibility for measuring relays and protection equipment.

Tests specified in this standard are not required for equipment
not incorporating electronic circuits, for example
electromechanical relays.

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.

Emission

The object of this standard is to specify limits and test
methods, for measuring relays and protection equipment in relation
to electromagnetic emissions which may cause interference in other
equipment. These emission limits represent electromagnetic
compatibility requirements and have been selected to ensure that
the disturbances generated by measuring relays and protection
equipment, operated normally in substations and power plants, do
not exceed a specified level which could prevent other equipment
from operating as intended.

Test requirements are specified for the enclosure and auxiliary
power supply ports.

Immunity

This standard is to specify the immunity test requirements for
measuring relays and protection equipment in relation to continuous
and transient, conducted and radiated disturbances, including
electrostatic discharges.

These test requirements represent the electromagnetic
compatibility immunity requirements and have been selected so as to
ensure an adequate level of immunity for measuring relays and
protection equipment, operated normally in substations and power
plants.

NOTE 1 Safety considerations are not covered in this
standard.

NOTE 2 In special cases, situations will arise where the levels
of disturbance could exceed the levels specified in this standard,
for example where a hand-held transmitter or a mobile telephone is
used in close proximity to measuring relays and protection
equipment. In these instances, special precautions and procedures
could have to be employed.