SN EN 60076-3 : 2001

INTRODUCTION
Clause
1 Scope
2 Normative references
3 Definitions
4 General
5 Highest voltage for equipment and insulation level
6 Rules for some particular transformers
7 Insulation requirements and dielectric tests - Basic
   rules
   7.1 General
   7.2 Insulation requirements
   7.3 Dielectric tests
   7.4 Insulation requirements and tests for the neutral
       terminal of a winding
8 Tests on a transformers having a tapped winding
9 Repeated dielectric tests
10 Insulation of auxiliary wiring
11 Separate source AC withstand voltage test
12 Induced AC voltage tests (ACSD, ACLD)
   12.1 General
   12.2 Short-duration induced AC withstand voltage test
        (ACSD) for transformers with uniformity insulated
        high-voltage windings
   12.3 Short-duration AC withstand voltage test (ACSD) for
        transformers with non-uniformity insulated
        high-voltage windings
   12.4 Long-duration induced AC voltage test (ACSD) with
        non-uniformity and/or uniformity insulated
        high-voltage windings, according to table 1
13 Lightning impulse (LI) test
   13.1 General
   13.2 Test sequence
   13.3 Test connections
   13.4 Records of test
   13.5 Test criteria
14 Test with lightning impulse chopped on the tail (LIC)
   14.1 General
   14.2 Chopping gap and characteristics of the chopping
   14.3 Test sequence and test criteria
15 Switching impulse test (SI)
   15.1 General
   15.2 Test sequence and records
   15.3 Test connections
   15.4 Test criteria
16 External clearances in air
   16.1 General
   16.2 Bushing clearance requirements as determined by
        transformer insulation withstand voltages
Annex A (Informative) Application guide for partial
        discharge measurements during induced a.c.
        withstand voltage test on transformers according
        to 12.2, 12.3 and 12.4
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 an order
Annex D (normative) ACSD
Annex ZA (normative) Normative references to international
         publications with their corresponding European
         publications
Annex ZB (normative) Special national conditions

Applies to single-phase and three-phase oil-immersed power transformers with the exception of certain small and special transformers.