The Optimal Design of Electromagnetic Compatibility for Electronic Transformer

As the data acquisition equipment of high voltage and large current in the smart substation, the electronic transformer’s measurement accuracy is the most important factor to ensure reliable and accurate control of power grid. However, due to the existence of strong electromagnetic disturbance sources in substation, the electronic transformer is strongly influenced in operation. The finite element analysis method is presented to establish typical model and calculate the electromagnetic field of typical structure of electronic instrument transformer in this paper. Then the main influence factors of measurement accuracy is assessed by analyzing the outer shield structure, the main capacitance and the change of surrounding electromagnetic field. Finally, the optimal design of electromagnetic compatibility is proposed in this paper. The results show that the electronic transformer prototype with optimized design has excellent anti-electromagnetic interference performance and meets the accuracy requirement of 0.2 accuracy class when it is running in the power grid.