Purpose and Standards for Switching impulse test & Lightning impulse test
The purpose of the test is to verify the integrity of the insulation for transient voltages, which are caused by atmospheric phenomena (lightning strikes), switching operations or network flaws.
IEC: 60060-1
High-voltage test techniques – Part 1: "General definitions and test requirements
IEC 60060-2
High-voltage test techniques – Part 2: "Measuring systems
IEC 60060-3
High voltage test techniques – Part 3: "Definitions and requirements for onsite tests
IEC 60076-3
Power Transformers – Part 3: "Insulation levels, dielectric tests and external clearances in air
IEC 60076-4
"Guide to lightning impulse and switching impulse testing of power transformers and reactors
IEE C57.12.90 Clause 10: "Dielectric test
IEE C57.98
"Guide to impulse testing techniques, interpretation of oscillograms and failure detection criteria