|
摘要: |
纵向零序电压式发电机匝间保护,由于动作灵敏度的要求,其动作整定值很小(2.5~3V),受外界条件的影响较大。增加具有故障量的负序功率方向闭锁,改进电压互感器(TV)断线闭锁功能,能有效地减小该匝间保护的误动几率。 |
关键词: 负序功率方向,电压互感器断线闭锁,匝间保护 |
DOI: |
分类号:TM774 |
基金项目: |
|
Discussion on enhancing reliability of stator winding''''s inter-turn S/C protection for large thermal generator |
ZHANG Mao - qiang
|
Abstract: |
In order to meet the sensitivity requirement ,the settings of the longitudinal zero - sequence - voltage inter - turn fault protection are usually quite small ( 2.5~3V ),which is much influenced by system disturbance.By adding a negative - sequence fault - power directional element and a finer TV break detection element to block the tripping at external fault ,the improper trips of the integrated protection may effectively decreased. |
Key words: negative -sequence power direction,CT wire break blocking,inter -turn fault protection, |