GB/T 1094.7-2008 in English

《GB/T 1094.7-2008电力变压器 第7部分：油浸式电力变压器负载导则》由TC44（全国变压器标准化技术委员会）归口，主管部门为中国电器工业协会。
本标准适用于油浸式变压器。它阐述了变压器在不同环境温度和负载条件下的运行对其寿命的影响。

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