FOREWORD
INTRODUCTION
1 Scope
2 Normative references
3 Terms and definitions
4 General
5 Highest voltage for equipment and rated insulation
level
6 Transformers with re-connectable windings
7 Dielectric tests
8 Dielectric tests on transformers that have been
in service
9 Insulation of auxiliary wiring (AuxW)
10 Applied voltage test (AV)
11 Induced voltage tests (IVW and IVPD)
12 Line terminal AC withstand test (LTAC)
13 Lightning impulse tests (LI, LIC, LIN, LIMT)
14 Switching impulse test (SI)
15 Action following test failure
16 External clearances in air
Annex A (informative) - Application guide for partial
discharge measurements on transformers
Annex B (informative) - Overvoltage transferred from
the high-voltage winding to a low-voltage
winding
Annex C (informative) - Information on transformer
insulation and dielectric tests to be supplied
with an enquiry and with an order
Annex D (informative) - Neutral insulation voltage level
calculation
Annex E (informative) - Basis for dielectric tests, insulation
levels and clearances
Bibliography
Annex ZA (normative) - Normative references to international
publications with their corresponding European
publications