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。
Shanghai Electric Appliance co., Ltd. is the production of variable transformers and control devices, isolation transformers, voltage regulator, volta.
电器配件；电力变压器。电动机。电焊机。仪上海华变电器有限公司。
Shanghai Electric Appliance co., Ltd. is the production of variable transformers and control devices, isolation transformers, voltage regulator, volta.
电器配件；电力变压器。电动机。电焊机。仪上海华变电器有限公司。
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