There are considerable pulsating stresses between the hub and rib plate of rotor spider in bulb hydrogenerator.So some defects such as cracks would occur during long-time operation of the unit.

• 灯泡式水轮发电机轮毂和辐板间承受很大的脉动载荷,在长期运行中,偶有裂纹等缺陷产生。