The PVA Combined Current / Voltage Transformers are used for supplying measurement and protection of systems current and voltage signals in 50Hz electric Hitachi Energy.
PVA transformers are top core type CT design with an inductive voltage transformer housed in the base. The current and voltage modules are encapsulated in a common hermetic housing filled with PCB-free transformer oil. Top core current design makes it possible to achieve high values of thermal and dynamic short-circuit currents as well as broad range of rated primary currents and outputs of secondary windings.
Placing the CT and VT modules in one housing gives considerable savings, thanks to lower number of transformers in a bay, less supporting structures, connections and space needed in the substation, lower transportation and installation costs.