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