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南汀河四级电站1号机组安装HL220-WJ-71水轮机,配SFW143/72-8,2000kW发电机。发电机导轴承冷却结构为内冷式,即轴承瓦背中穿有孔,冷却水流经其内而达到冷却的目的。此结构冷却方式直接、效果好,存在的问题是受瓦背厚度限制,因孔直径太小,故孔口常被漏过滤网的草屑堵住。多年的运行证明,绝大多数冷却水中断故障是
Unit 1 of Nanting 4 hydropower station installed HL220-WJ-71 turbine with SFW143 / 72-8 and 2000kW generator. The cooling structure of the generator guide bearing is an internal cooling type, that is, a hole is drilled in the back of the bearing bush, and the cooling water flows through the inside to achieve the purpose of cooling. The structure of the cooling method is direct, the effect is good, there is the problem is limited by the thickness of tile back, because the hole diameter is too small, so the hole is often blocked by the cuticle filter leakage. Years of operation proved that the vast majority of cooling water interruption fault is