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由于双绕组发电机的主副绕组相当于一台变压器,主绕组短路后,副绕组电压必很低,发电机就不可能自励建压,因此不能直接实现短路烘干。去年我县有一台125kW的双绕组发电机,因尾水位上涨被淹。水退后,我们借用电网220V电源供励磁,实现了短路烘干,效果很好。现介绍如下。(一) 运转接线在打×处(见附图)拆除副绕组在三相整流桥上的连接,使副绕组开路。引接电网单相电源,经60安控制开关和限流电热丝,接至整流桥上任意二个交流输
Since the primary and secondary windings of a double-wound generator are equivalent to one transformer, the voltage of the secondary winding must be low after the main winding is short-circuited, and it is impossible for the generator to self-build pressure so that short-circuiting and drying can not be realized directly. Last year, my county had a 125kW dual-winding generator, flooded due to tail water level rise. Water back, we borrow 220V power grid for excitation, to achieve a short circuit drying, the effect is very good. Now introduced as follows. (A) operation wiring in the play × (see photo) Remove the secondary winding connection in the three-phase rectifier bridge, so that the secondary winding open. Lead to the grid single-phase power supply, the 60-control switch and current limiting heating wire, connected to the rectifier bridge on any two exchanges