发电厂低压厂用变压器主保护配置分析  

Analysis on main protection of low-voltage transformers in power plants

作　　者：梁玉枝[1] 李琳[2] 李江国 

机构地区：[1]华北电力科学研究院有限责任公司,北京100045 [2]中国矿业大学(北京)机电学院,北京100083 [3]内蒙古岱海发电有限责任公司,内蒙古岱海013700

出　　处：《中国电力》2009年第5期82-84,共3页Electric Power

摘　　要：近年来大型发电厂低压厂用静电除尘变压器的容量一般为2500kVA,在运行中的谐波分量较大,在带50%以上负荷时,经常出现差动保护误动跳闸的现象,给生产运行带来不便。通过对低压厂用变压器速断保护整定原则及灵敏度计算分析认为,在速断保护满足灵敏性要求的前提下,低压厂用变压器可以不装设差动保护,而用速断保护作为低压厂用变压器的主保护,以简化保护配置,减少误动机率。In recent years, the capacity of a low-voltage transformer is generally 2 500 kVA which is used for electrostatic precipitators in large-scale power plants. The harmonic component of the transformer is larger in operation. The differential protection of the transformer often has real-operation tripping phenomenon in more than 50% load. Through analysis and calculation of setting principles and sensitivity for instantaneous trip protection of a low-voltage transformer, the differential protection can be cancelled and can use instantaneous trip protection as the main protection of a low-voltage transformer in order to simplify the protection configuration, and reduce the rate of mal-operation.

关 键 词：低压厂用变压器 差动保护 速断保护 灵敏度 

分 类 号：TM772[电气工程—电力系统及自动化]