旁路母线带变压器运行方式二次回路的设计

Design and Evaluation of Secondary Circuit on Bypass Bus Operation Mode with Transformer

乌兹洛瓦亚变电站2台主变压器计划采用高压侧和中压侧旁带运行方式,对该运行方式的二次回路进行了设计:在能够满足所有电气要求的前提下,220 kV侧旁路电流互感器的型号和变比选择与主变压器电流互感器相同;旁路电流互感器的2组二次绕组专用于变压器保护,变压器保护柜装有电流切换连片,变压器在旁带时只需切换电流即可;110 kV侧由于电流互感器变比不同,在旁带时需修改保护定值;旁路带主变压器运行时的失灵保护判据取旁路电流互感器电流进行判别。变电站设备投入运行至今状况良好。

In order to meet all electrical requirements of the premise, the type of 220 kV side bypass current transformer and choice of transformation ratio are the same as those of the main transformer. Two bypass current transformer secondary winding transformer protection designed for use. Transformer protection screen with current switching contiguous. Just when the transformer sideband switching current on the protective screen can be, but pay attention to another transformer current switching contiguous appropriate action should be done. Because 110 kV side of the current transformer ratio different, need to change with time in the next setpoint. Bypass with a main transformer runtime failure protection to take the bypass current transformer for current discrimination.