CAJ | 학술논문

针对传统热继电器在电机运行保护时存在的灵敏度低、调整误差大、功耗大、耗材多、性能指标落后等缺陷，文章设计一种新型电机过载保护装置，该装置利用一个磁环感应线圈采集电机的某一相电流信号，同时采用线路板以干触点接入交流接触器控制线圈回路，该方式能适应多种规格的交流电机保护。另外不同于传统保护方法只检测高限，文中所设计装置还包含低限检测线路，并通过对称负载中一相电流的变化来反映电机不同的工作状态，在保障电机不被损坏的情况下充分利用电机的过载能力。
침대전통열계전기재전궤운행보호시존재적령민도저、조정오차대、공모대、모재다、성능지표락후등결함，문장설계일충신형전궤과재보호장치，해장치이용일개자배감응선권채집전궤적모일상전류신호，동시채용선로판이간촉점접입교류접촉기공제선권회로，해방식능괄응다충규격적교류전궤보호。령외불동우전통보호방법지검측고한，문중소설계장치환포함저한검측선로，병통과대칭부재중일상전류적변화래반영전궤불동적공작상태，재보장전궤불피손배적정황하충분이용전궤적과재능력。
Aiming at the disadvantages such as low sensitivity ,great error in the action ,huge power consumption ,bigger consumption of material and bad performance index during the motor protection of traditional thermal relay ,a new overload protection device of electrical motors is presented .The current of one phase can be collected with a magnetic circular induction coil and the designed printed circuit board(PCB) can access to the coil control of AC contactor with dry contact .This device can be used to protect more than one kind of AC motors .Moreover ,different from traditional protection method w hich only conducts the high limit detection ,the high limit detection and low limit detection are both conducted in this device .So the improved detection device w hich detects one phase current under symmetrical load to reflect working condition of the motor can use the overload ability of the motor fully without the damage of the motor .