When the variation of bus-bar voltage and frequency occurs, the reliability of electric motors, transformers, control and protection system is analyzed in this thesis.
当电网电压和频率的变化时，分析了电动机、变压器、控制及保护系统、照明系统、通信导航设备等受电器工作的可靠性。
Back in the 80s low voltage lighting with transformers was new technology, now we are close to having a computer inside every light fitting to control LEDs!
早在上世纪80年代，带变压器的低压照明已经是新技术了，而现在，我们就差没在每个灯光装置里面置入一台“电脑”来控制所用的LED灯了！
ABB will also provide low-voltage switchgear, motor control centers, and distribution (MV/LV) transformers.
ABB还将提供低压开关装置，电机控制中心和分布式变压器。
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