IEC TS 60076-14:2009

FOREWORD
INTRODUCTION
1 Scope
2 Normative references
3 Terms and definitions
4 Insulation materials
   4.1 General
   4.2 Ageing and lifetime of insulation materials
   4.3 Solid insulation
   4.4 Wire enamel insulation
   4.5 Insulating liquids
5 Insulation systems
   5.1 General
   5.2 Insulation system types
        5.2.1 Homogeneous high-temperature insulation
               system
        5.2.2 Hybrid insulation system
        5.2.3 Semi-hybrid insulation system
        5.2.4 Mixed insulation system
6 Temperature limits
7 Transformer accessories and compatibility
   7.1 General
   7.2 Bushings
   7.3 Tap-changer
   7.4 Gasket material
   7.5 Tank painting
   7.6 Coolers
   7.7 Pumps
   7.8 Tank and conservator
   7.9 Adhesives
   7.10 Current transformers
   7.11 Temperature gauges and indicators
   7.12 Protective relays
   7.13 Auxiliary cables
8 Special design considerations
   8.1 Short-circuit considerations
   8.2 Dielectric requirements
   8.3 Temperature requirements
   8.4 Overload
   8.5 Effects of harmonic currents
   8.6 Liquid preservation system
9 Required information
   9.1 Information to be provided by the purchaser
        9.1.1 Ambient temperatures and loading cycle
        9.1.2 Harmonic currents
        9.1.3 Other unusual service conditions
   9.2 Information to be provided by the manufacturer
        9.2.1 Thermal characteristics
        9.2.2 Reference temperature
        9.2.3 Guarantees
10 Rating plate and additional information
   10.1 Rating and warning plates
        10.1.1 Rating plate
        10.1.2 Warning plate
   10.2 Transformer manual
11 Testing
   11.1 General
   11.2 Requirements for routine, type and special tests
        11.2.1 General
        11.2.2 Routine tests
        11.2.3 Type tests
        11.2.4 Special tests
   11.3 Temperature-rise test
        11.3.1 General
        11.3.2 Evaluation of temperature-rise tests for
               mixed insulation systems
   11.4 Dielectric type tests
12 Supervision, diagnostics, and maintenance
   12.1 General
   12.2 Transformers filled with mineral insulating oil
   12.3 Transformers filled with high-temperature insulating
        liquids
Annex A (informative) Calculation of bubble generation
        temperature
Annex B (informative) A perspective of transformer
        temperatures from Tables 4 and 5
Bibliography

IEC 60076-14:2009(E) provides specification, design, testing and loading information for use by both the manufacturer and user of liquid-immersed power transformers employing either high-temperature insulation or combinations of high-temperature and conventional insulation. Is applicable to:
- power transformers designed in accordance with IEC 60076-1,
- convertor transformers designed to IEC 61378 series,
- arc furnace transformers,
- and covers the use of various liquid and solid insulation combinations. This new edition includes the following significant technical changes with respect to the previous edition:
- enhancement of insulation system descriptions;
- clarification of temperature rise limits
- and the addition of overload temperature limits.