为了有效地维护发电机正常运行，介绍了发电机中 性点接地装置中二次负载电阻器研制过程。该电阻器采用高电阻电热合金作为电阻材料，电 阻片布置采用叠式多层框架结构，无感蛇形绕制；为防止受潮及积尘，电阻器对地绝缘采用 10 kV级耐压瓷瓶，电阻片绝缘材料采用新型的纯氧化物高温陶瓷。实测结果表明：电阻器 常规运行温度由原350℃提高到1 000℃，电阻材料截面积减少43%；绝缘子耐受高温达1 200 ℃，抗折强度大于300 MPa，按设计最大电流运行1 min后，其性能指标均符合设计要求，功率因数优于90%的一般标准。

For effectively protecting normal operation of a gene rator, the development process of a secondary-load resistor in the neutral-point grounding of the generator is presented . The resistor uses high-resistance electrically heated allo y as resistance material, in which the resistance-pieces arr angement adopts multi-layer framed structure with non-inductive coil winding. For preventing moisture and dirt, the insu lation of resistor agains the earth uses 10 kV withstand-vol tage porcelain insulator the insulation of resistor employs new pure*. oxide high-temperature porcelain insulator. The me asured results show that: the conventional operation temperature of the resistor may be raised from 350℃ to 1 000℃, the cross-section area decreased by 43%; the heat*.endurance of the insultor may be reached to 1 200℃; the bending strength is more than 300 MPa; when the generat or is operated with maximum design current in 1 minute, its performance indexes all reach design requirements, and the power factor is superior to 90% of genera l standard .