The PA current transformers are used in electric Hitachi Energy with a system voltage of up to 145 kV and a frequency of 50 Hz.
They are designed using top core current transformer construction. The active elements are located in a hermetic housing inside the head of the transformer. PA current transformers are filled with PCB-free transformer oil.
Top core construction makes it possible to achieve high values of thermal and dynamic short-circuit currents, as well as a broad range of rated primary currents and secondary output windings.