DD ENV 50232:1997

Contents
Foreword
Introduction
1. Scope
2. Normative references
3. Definitions, symbols and abbreviations
    3.1 Definitions
    3.2 Symbols and abbreviations
4. General requirements
    4.1 Isolating transformer
    4.2 Connection cables
    4.3 Electrical characteristics
5. Type and production tests
    5.1 Type tests
    5.2 Requalification tests
    5.3 Production tests
6. Tests description
    6.1 On load current ratio
    6.2 Power factor
    6.3 Efficiency
    6.4 Short circuit current
    6.5 Off load voltage
    6.6 Dielectric strength
    6.7 Current leakage
    6.8 Fall test
    6.9 Pull test
    6.10 Soaking tests
    6.11 Dimensional tests
    6.12 Ageing test
    6.13 Cycling test
    6.14 Temperature rise test
    6.15 Surge test
    6.16 Gas tightness test
7. Classification and designation
    7.1 Classification
    7.2 Marking, labelling, packaging

Specifies the nominal characteristics of the isolating transformers used in airfield ground lighting for 6,6 A series circuits that are supplied by Constant Current Regulators up to 30 kW in rating. The isolating transformer gives electrical insulation, between the primary circuit that is supplied by a constant current regulator and the secondary connected to the load (generally the lamp of the luminaire) under the specified conditions.