TAPPCHANGING CONTROL SYSTEM IN ACCDC CONVERSION EQUIPMENT

摘要

PURPOSE:To improve an overexcitation of each instrument connected to the phase modifier and a voltage drop by the use of an automatic voltage regulator with a control command to the phase modifier for controlling the tap-changing transformer in loading. CONSTITUTION:The tap-changing transformer 8 connected to the phase modifier in the AC-DC conversion equipment is controlled by means of a tap-changing. A by- pass circuit operated by a control command of the phase modifier consisting of a shunt capacitor SC and a shunt reactor SR is provided to the automatic voltage regulator AVR 90. A tap-changing time is sharply reduced by performing a tap- changing capable of compensating a voltage variation which is previously calculated by a control command of the phase modifier according to the system condition.