Overview

The PVA 123a and PVA 145a combined instrument transformer is top core construction; it comprises current and voltage modules encapsulated in common hermetically sealed housing filled with PCB free transformer oil. The current module is located in transformer’s head and voltage module is in the bottom tank. The transformer’s stainless steel expansion bellows is fixed to the head and it is made of stainless steel. The expansion bellows compensates for thermal changes in oil volume.
The location of both CT and VT modules in one housing benefits the environment and offers reductions in the total cost of ownership of a substation due to:

Reduced Station footprint:
- lower number of transformers in a bay,
- lower number of supporting structures,
- lower number of connections.
- lower cost of civil works.
- lower transportation costs.
- lower installation costs.

Technology parameters