FOREWORD
INTRODUCTION
1 Scope
2 Normative references
3 Definitions
4 General
5 Highest voltage for equipment and 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
10 Applied voltage test
11 Induced voltage tests (IVW and IVPD)
12 Line terminal AC withstand test
13 Lightning impulse tests
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 insulation and test levels