工厂供电第4章变电所-低压开关设备及作业讲义.pptVIP

第四章 工厂变配电所及其一次系统;低压开关设备及其选择;低压开关设备及其选择;低压电器;低压电器;低压电器;低压断路器;低压断路器;低压断路器;低压断路器;低压断路器;低压断路器;低压断路器;低压断路器;低压断路器;低压断路器;低压断路器;低压断路器;低压断路器;低压断路器;1）额定工作电压Ue V Rated operational voltage 额定冲击耐受电压 Uimp V Rated impulse withstand voltage 2）额定持续电流 Iu A Rated uninterrupted current 额定短路接通能力Icm kA Rated short-circuit making capacity 额定短路分断能力Icn kA Rated short-circuit breaking capacity 额定极限短路分断能力Icu kA Icu Test cycle O-t-CO 额定运行短路分断能力Ics kA Ics Test cycle O-t-CO-t-CO 额定短时耐受电流Icw kA Rated short-time withstand current;2）过载脱扣器的电流整定值Ir A Setting current of overload release 短路脱扣器的电流整定值Irm kA Setting current of short-circuit release 3）机械寿命、电气寿命 Mechanical and electrical lifespan 4）工作条件 Operational conditions, such as  （海拔高度、温度、湿度、 污染等级等） … pollution degree etc. ;低压断路器;低压断路器;低压电器;接触器;接触器;接触器;The Contactor;接触器;接触器;起动器;Actuation of pushbutton I energizes the coil of contactor Q11. The contactor switches on the motor and maintains itself after the button is enables via its own auxiliary contact Q11/14-13 and pushbutton 0. Contactor Q11 is de-energized, in the normal course of events, by actuation of pushbutton 0. In the event of an overload, it is de-energized via the normally closed contact 95-96 on the overload relay F2. The coil current is interrupted, and contactor Q11 switches the motor off.;起动器;低压开关设备及其选择;低压成套开关设备和控制设备;低压成套开关设备和控制设备;低压成套开关设备和控制设备;低压成套开关设备和控制设备;低压成套开关设备和控制设备;低压成套开关设备和控制设备;低压成套开关设备和控制设备;低压开关柜;低压开关柜;低压成套开关设???和控制设备;低压母线槽系统;低压母线槽系统;低压母线槽系统;低压母线槽系统;作 业;作 业;作 业