| 摘要 |
PROBLEM TO BE SOLVED: To improve the power factor of an electric circuit, to decrease the reactive power and the voltage drop and to reduce the loss, by providing a tap in an inserting transformer, and using a resistance-type or inductance-type switching unit in interlocking with a phase meter. SOLUTION: A tap 4 is provided in an insertion transformer 2. A resistance- type or inductance switching unit is used in interconnection with a phase meter. Furthermore, a tertiary winding is provided in power-supply transformer 1. A capacitor 3 can be connected to this winding. That is to say, the capacitor 3 is connected to a transmission circuit through the insertion transformer 2. Therefore, the connecting point becomes the intermediate point of a transmission transformer in balance in the case of a three-wire system. In the delta connection in a three-phase system, the connection is performed to the intermediate part of the transformer winding or to an external line. In the star connection, the connection is performed between the common connecting point, which is the grounding point, and the winding of the individual phase transformer. Thus, the high frequency can be controlled. Therefore, the power factor of the electric circuit can be improved, the reactive power is reduced, the voltage drop is also decreased and the loss can be reduced. |
