| 摘要 |
PURPOSE:To prevent an accident by making the X-Y coordinates of the maximum discharging charge and a value relating to the mean discharge energy, plotting a measuring point of the winging, adding the tendency of dielectric deterioration of the winding to the residual dielectric breakdown voltage, and deciding the result. CONSTITUTION:The measuring point of the range insulation winding is plotted on the X-Y coordinates where the maximum discharge charge Qm and the value W relating to the mean discharge energy (for instance, gamma) have been graduated in the two axis directions. According to this graph, the farther the position is separated from the position of the initial coil group O, the lower the AC dielectric breakdown voltage (residual BDV) becomes for the residual short time of the winding, but the normal deterioration coil and the abnormal deterioration coil go forward in the straight line N and A, respectively. Also, when suitable value is put into the expression of VR=100-k1(W-W')-k2 log (Qm/Qm'), and a curve which has made VRa param eter is drawn on the X-Y coordinates which have been graduated by log Qm and gamma, it becomes a parallel straight line group. In this way, since not only t he deterioration tendency but also the residual BDV are decided easily, an accident is prevented. |
