BS EN 60255-22-4:2008

1 Scope and object
2 Normative references
3 Terms and definitions
4 Test severity level
5 Test equipment
6 Test set-up
  6.1 Test set-up using CDNs
  6.2 Test set-up using the capacitive coupling clamp
7 Test procedure
8 Criteria for acceptance
9 Test report
Annex A (informative) - Background information for fast
                        transient/burst immunity test
Annex B (informative) - Examples of environments for Class A
                        and Class B test levels
Annex ZA (normative) - Normative references to international
                       publications with their corresponding
                       European publications

Describes the general requirements for electrical fast transient immunity tests for measuring relays and protection equipment for power system protection, including the control, monitoring and process interface equipment used with these systems.

IEC 60255-22-4:2008 specifies the general requirements for electrical fast transient immunity tests for measuring relays and protection equipment for power system protection, including the control, monitoring and process interface equipment used with these systems. Is based on IEC 61000-4-4. The objective of the tests is to confirm that the equipment under test will operate correctly when energized and subjected to repetitive fast transients (bursts) such as those originating from interrupting of inductive loads, relay contact bounce, etc. The main change with respect to the previous edition is the improvement of the test severity level regarding the repetition rate.