Research on Key Technologies of Electronic Transformer Acquisition Unit

Electronic transformer acquisition unit is used to adjust,integrate,and A/D-convert the signal from transformer sensing head.The detailed implementation means of the acquisition unit decide the precision,transient response and reliability of the transformer.In this paper,several key technologies are described,including analog-and digital-type sampling unit's power supply supervision,temperature drift mitigation,sampling accuracy improvement,interchangeability of transformer sensing head,and hot-standby redundancy of power supply.The influence of digital integration on harmonics and transient states is discussed.Practical applications verify the improvements in both performance and cost of the electronic transformers with these methods.