Application and design of load ratio-control equipment

Load ratio control of transformers, which means the possibility of changing the transformation ratio without interrupting the load, has found very rapid adoption on account of its wide application possibility. It provides the long sought solution for a voltage regulation on industrial loads and large blocks of power, and enables a perfect tie-in operation of two or more power systems with any desired load dispatch regardless of voltage or power factor. It is the only economical method known to operate extended transmission systems on an equipotential basis. The paper gives the various possible applications and some details of the electrical and mechanical design of the apparatus.