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1 关于加快故障切除时间 快速切除故障,即加快保护和开关动作时间,可减轻故障产生的冲击,促使电压快速恢夏、减缓发电机加速,是提高系统稳定性最有效的措施,其作用十分显著。计算表明,湖南500kV电网正常接线方式下,500kV线路故障近端切除时间由0.09s降至0.08s时,五岗、五娄、岗云、葛岗线三相短路故障可少切系统大量负荷,娄云线三相短路故障不切负荷即可维持系统暂态稳定,500kV母线故障切除时间由0.10s降至0.09s,任何
1 Accelerating voltage and speed recovery and slowing down the generator acceleration are the most effective measures to improve the stability of the system, which is very effective in speeding up the quick removal of fault removal time, that is, accelerating the protection and switching operation time, which can reduce the impact generated by the fault. . The calculation shows that under the normal connection mode of Hunan 500kV power grid, when the 500kV line fault near-end cutting time is reduced from 0.09s to 0.08s, the large load of the system can be cut less when the three-phase short-circuit faults of Wugang, Wuluo, Gangyun, Lou Yun line three-phase short-circuit fault does not cut the load to maintain system transient stability, 500kV bus fault removal time from 0.10s to 0.09s, any