as an example, finite element analysis and optimization design are made to a voltage transformer of rating primary voltage 35kv, rating secondary voltage 100v, rating frequency 50hz.
by measuring the change of primary voltage of the transformer in several periods, pi controller adjusts the width of pulse so that flux imbalance of the transformer is limited in a reasonable scope.
by adopting resistance divider, the voltage sensor designed in this paper can transform primary voltage into micro-signal less than 10v, which can be used in measurement system directly.
t3 on sampling signal panel is sampling transformer, which can convert primary voltage (0~380v)of primary transformer into 0~10v ac voltage.
取样信号板上t3为取样变压器,将整流变压器一次电压(0~380v)变为0~10v交流电压。
once the customer loads are determined , they are grouped for service from secondary lines connected to distri2 bution transformers that step down from primary voltage .