上海仪表电子技术发展中心研制的SJDB型系列三相交流电动机多功能保护器通过上海市仪表电讯工业局组织的技术鉴定。随着社会生产和生活的飞速发展,电动机的应用数量迅速增长,应用范围不断扩大。但是,由于电网电压波动幅度大、断缺相、过载严重等主客观原因经常造成电动机特别是三相交流电动机损坏乃至烧毁,更有甚者酿成火灾、人员伤亡等重大事故,损失巨大,给国民生产和职工生命安全带来难以预测的潜在威胁。据此,上海仪表电子技术发展中心开发了对电源电压过高、过低、三相严重不平衡、 Shanghai Instrument Electronics Technology Development Center developed SJDB series of three-phase AC motor multi-function protector through the Shanghai Instrument Telecommunications Industry Organization technical appraisal. With the rapid development of social production and living, the number of motor applications has been rapidly increasing, and the range of applications has been constantly expanding. However, subjective and objective reasons, such as large fluctuation of grid voltage, lack of phase and serious overload, often result in damage to the motor, especially the three-phase AC motor, and even burned down, causing huge losses such as fire and casualties National production and employee life safety bring unpredictable potential threat. Accordingly, Shanghai Instrument Electronics Technology Development Center has developed a power supply voltage is too high, too low, three-phase serious imbalance,