关键词: 电动盘车, 剩磁, 启动电流, 水电站

Abstract: The axis measurement and adjustment of hydroelectric generating units are the key processes after completing the assembly of the whole units, which require the use of barring device. Empirical formula is often adopted in the engineering projects to calculate the current value added to the constant-torque. It has been proven by practices of many power stations that the starting current calculated by empirical formula deviates much from the actual input current; however, the starting current calculated by electromagnetism approximates the actual added current value. The computing process and practical application results are elaborated and the influence on barring device due to the unbalanced magnetic pull and remanence is dealt with by corresponding measures. Through the operation in many power stations, the units operate well and both vibration and throw are within the allowable range. Calculation formula is derived and the problems are solved in this study, which provides certain reference for axis adjustments of hydropower stations.

Key words: electric barring device, remanence, starting current, hydropower station