Protection specifications保护规格
Protection system settings at wind turbine风电机组保护系统设定值
UNS: operating voltage of WTat
generator side
UNS: 发电机侧的风电机组运行电压
??Undervoltage protection U< = 0,8 UNS, retardation 1,5 s to 2,4 s??低压保护U< = 0.8 UNS, 延时1.5 s 至2.4 s
??To enable fault-ride-through, when fault is in the high-voltage system??当高压系统发生故障时确保低电压穿越
??Undervoltage protection U<< = 0,45 UNS, retardation 0,3 s低压保护U<< = 0.45 UNS, 延时0.3s
??For immediate switching-off, when fault is in the medium voltage system??当中压系统发生故障时能立即切断
??Overvoltage protection U>> = 1,2 UNS, retardation 0,1 s
??For protection of WT equipment，为了保护风电机组设备
过压保护U>> = 1.2 UNS, 延时0.1s
??Overfrequency protection f> = 51,5 Hz and Underfrequency protection f< = 47,5 Hz??高频保护f> = 51.5 Hz 和低频保护f< = 47.5 Hz
??To enable operation over the required frequency range，确保在要求的频率范围内运行
LVRT Workshop Beijing 06./07. January 2009Weck: LVRT requirements and testing
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