| 摘要 |
PURPOSE:To prevent DC magnetic deflection of a transformer by providing the function for comparing ignition angles given to thyristors within the same phase, and correcting the deviation of said comparison in the thyristor groups connected adversely in parallel with each other. CONSTITUTION:A thyristor controlled reactor (TCR)1 consists of thyristors U, V, Y, W and Z, and reactors L1, L2 and L3. The thyristors U and X, V and Y, and W and Z are connected adversely in parallel with each other respectively. The currents flowing to the reactors L1-L3 are controlled with control of the ignition phase. When the phases of thyristors are controlled for control of the voltage of an electric power system, the integration arithmetic results or the ignition angle signals are compared with each other for each adversely parallel thyristors within the same phase. Then the deviations of said comparison are added, together for compensation. In other words, the ignition angles given to the thyristors within the same phase are compared with each other and the deviation of this comparison is corrected. The DC magnetic deflection is avoided for a transformer. |
