摘要
为了验证失磁保护和低励限制参数的配合关系,即发电机的失磁保护必须在励磁调节器的低励限制之后动作,提出将二者归算到同一平面上进行对比的观点,通过探讨失磁阻抗圆和功率圆的关系,给出了发电机失磁阻抗圆转化为功率圆的具体方法。以广东某电厂机组参数为例,通过计算绘出了其发电机的低励限制曲线和失磁保护异步圆,从低励限制曲线位于失磁保护异步圆外直观地判断出二者的动作顺序满足配合要求。
In order to testify matching of parameters of loss-of-excitation protection and low excitation limitation, namely the action of loss-of-excitation protection of generators should follow low excitation limitation of excitation regulator, the paper proposes to put the two in the same plane for comparison. By discussing relationship between impedance circle of loss-of-ex- citation and power circle, the paper brings forward a specific approach to the transmission. Parameter of units in a power plant in Guangdong is taken as an example, and curve of low excitation limitation and asynchronous circle of loss-of-excita- tion protection are framed out. It is visually judged that sequence of operation meets matching requirement because curve of low excitation limitation is by the outside of asynchronous circle of loss-of-excitation protection.
出处
《广东电力》
2011年第11期112-114,共3页
Guangdong Electric Power
关键词
失磁保护
励磁限制
整定配合
防止误动
loss-of-excitation protection
excitation limitation
setting and match
misoperation prevention
