This part of GB 1094 is applicable to oil-immersed transformers. It describes the effect of operation under various ambient temperatures and loading conditions on transformer life.
Note: for furnace transformers, the manufacturer shall be consulted in view of the special loading curve.
Foreword I
Introduction III
1 Scope
2 Normative References
3 Terms and Definitions
4 Symbols and Abbreviations
5 Effect of Loading Beyond Nameplate Rating
6 Relative Ageing Rate and Transformer Insulation Life
7 Limitations
8 Determination of Temperatures
9 Influence of Tap Changers
Appendix A (Informative) Non-thermally and Thermally Upgraded Insulation Paper
Appendix B (Informative) Example of Calculating and Presenting Overloading Data
Appendix C (Informative) Practical Example of the Exponential Formulas
Appendix D (Informative) Calculation of Winding and Oil Time Constant
Appendix E (Informative) Illustration of the Differential Equation Solution Method
Appendix F (Informative) Flowchart, Based on the Example in Appendix B
References
