Design of Non-Contact On-Load Automatic Regulate Voltage Transformer

Became automatic-mechanic contact, tap-changing switch does not fit for distributing transformer, almost all distributing transformers adopt no-load voltage-regulating. This paper introduces a distributing transformer which uses power electronic component as tap-changing switch of the transformer and realizes automatic onload voltage-regulating under the control of single-chip. We present the structure, fundamental principle, design method of each link and experimental results of the distributing transformer. The results show that we adopt solid-state relay as non-contact tap-changing switch has merits that onload voltage-regulating response quickly, small waveform distortion, long lifetime and low cost.