Transformer operating in the method of three-dimensional

The Nine areas graph method, eleven areas graph method and fifteen areas graph method are briefly introduced, then the limit setting in different situations of voltage limit and power factor are detailed elaborated. A three-dimensional areas control strategy is proposed, including three-dimensional control strategy and three-dimensional projection plane control strategy. Three-dimensional plane projection control strategy is a new control strategy that projection from different angles, it is simple to determine whether the transformer to meet the best running condition. The control strategy is high practical value, methods varied and easy to operate. It achieved optimal control and transformers´ economic operation. The projection control strategy is applied to the project of economic operation of transformers in a electric power bureau 220KV substation, then a data acquisition circuit is designed to achieve this control strategy and get satisfactory optimization results. By comparing the losses before and after optimization,proved that the control strategy is feasible.