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我厂一台旧调压变压器,额定容量9620KVA,一次电压10KV,二次电压0～14.5KV可调。无载开关分3个大档,每个大档中有载开关17级,1～17级为升压,17～1为降压。有载开关采用电动操作,由3相交流电机传动。为了准确停车,原有载控制电路采用二相反接制动,由于电路本身的缺陷及其它原因,经常会出现电机正转、反转反复进行的现象,如本来想升压,启动按钮后,却出现升压、降压来回动作,严重地威胁着变压器的安全运行。1991年初,将其改为能耗制动,使用了半年多,从没有出现上述现象,消除了一大安全隐患。
I plant an old regulator transformers, rated capacity 9620KVA, a voltage of 10KV, secondary voltage 0 ~ 14.5KV adjustable. No-load switch is divided into three big gear, each big gear in-load switch 17, 1 to 17 for the boost, 17 to 1 for the buck. The on-load switch adopts electric operation and is driven by 3-phase AC motor. In order to accurately stop the original load control circuit using two-phase reverse brake, due to the circuit’s own shortcomings and other reasons, often appear positive motor, reverse the phenomenon of repeated, such as would like to boost, start the button, but A boost, buck back and forth action, a serious threat to the safe operation of the transformer. In early 1991, it was replaced with energy-saving braking, which has been in use for more than six months. The above phenomenon has never occurred and a big security risk has been eliminated.