EN 60076-4:2002

FOREWORD
1 Scope
2 Normative references
3 General
4 Specified waveshapes
5 Test circuit
6 Calibration
7 Lightning impulse tests
   7.1 Waveshapes
   7.2 Impulses chopped on the tail
   7.3 Terminal connections and applicable methods of
        failure detection
   7.4 Test procedures
   7.5 Recording of tests
8 Switching impulse tests
   8.1 Special requirements
   8.2 Transformers
   8.3 Reactors
9 Interpretation of oscillograms or digital recordings
   9.1 Lightning impulse
   9.2 Switching impulse
10 Digital processing, including transfer function analysis
11 Impulse test reports
Annex A (informative) Principles of waveshape control
Annex B (informative) Typical oscillograms and digital
        recordings
Annex ZA (normative) Normative references to international
         publications with their corresponding European
         publications

Gives guidance and explanatory comments on the existing procedures for lightning and switching impulse testing of power transformers to supplement the requirements of EN 60076-3. Also generally applicable to the testing of reactors (see EN 60289), modifications to power transformer procedures being indicated where required. Information is given on waveshapes, test circuits including test connections, earthing practices, failure detection methods, test procedures, measuring techniques and interpretation of results.