Discussion on Voltage Frequency of Applied Voltage Test on Transformer and Reactor

The frequency of applied voltage test for transformers and reactors varies in different standards. This paper summarizes the provisions of existing China's standards, IEC standards, and IEEE standards on this issue, and points out the problems of the existing standards. This paper presents the impact of different frequency requirements on the testing equipment in AV testing, and also analyzes the influence of voltage frequency on insulation strength. Suggestions are proposed for providing different specified values for factory test and onsite hand-over test.