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 those systems.
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.