各种电气设备中，往往需要不同的电压电源。例如，我们在日常生活中的照明用电，都是220伏，或者110伏；机床、粉碎机等机器的电动机用电为380伏；而安全照明用电是36伏；城市工业供电线路的电压高达6千伏或10千伏。由于对用电要求不同，以及便于配备相适应的各种电器元件，将电压分成了许多等级，500伏级及以下，3干伏；6千伏；10干伏；35(44)千伏；60千伏；110干伏；154千伏；220千伏；330千伏级。其中，500伏以下电压称为低压系统，3千伏及以上称为高压系统。 In all kinds of electrical equipment, different voltage sources are required. For example, we have 220 volts, or 110 volts, in our daily lives. Machine tools, pulverizer and other machines have an electric motor of 380 volts. And the safety lighting is 36 volts; The voltage of the urban industrial supply line is as high as 6 kilovolts or 10 kilovolts. The voltage is divided into a number of grades, 500 volts and below, due to different electrical requirements and various electrical components that are easy to accommodate. 6 kv; 10 dry v; 35 kv (44); 60 kv; 110 dry v; 154 kv; 220 kv; 330 QianFuJi. Among them, the voltage below 500 volts is called the low voltage system, which is known as the high voltage system. 现代化的工业企业，广泛地采用了电力做为能源，电能都是由水电站和发电广的发电机直接转化出来的。发电机发出来的电力根据输送距离将按照不同的电压等级输送出去，就需要有一种专门改变电压的设备，这种设备叫做“控制变压器”。 Modern industrial enterprises, widely adopted as energy, are converted directly by hydropower stations and electricity generators. Generator of electricity according to the conveying distance will carry out according to the different voltage grade, you need to have a special change voltage equipment, this equipment is called "control transformer". 控制变压器在输配电系统中占着很重要的地位，要求它安全可靠地运行，当控制变压器在运行中损坏时，则将造成停电事故。所以，控制变压器是非常重要的电气设备。除了在电力系统之外，在其它方面控制变压器应用得也十分广泛。例如，根据配套需要供给冶炼用电炉控制变压器；电解或化工用整流控制变压器；煤矿用防爆控制变压器和特殊结构的矿用控制变压器；以及交通远输用的电机车控制变压器和船用控制变压器等。 Control transformer occupy very important position in transmission and distribution system, require it to run safely and reliably, when in the operation of the control transformer in damage will cause blackouts. So, the control transformer is a very important electrical device. In addition to the power system, the control of transformers in other areas is also widely applied. For example, according to the necessary supply of smelting furnace control transformer; Rectifier control transformer for electrolysis or chemical industry; Control transformer for coal mine explosion-proof transformer and special structure; And the electric locomotive control transformer and the Marine control transformer for the transport.