电压互感器和变压器很像，都是用来变换线路上的电压，主要区别就在于容量、尺寸、工作磁密和补偿。 The voltage transformer is similar to the transformer, which is used to transform the voltage on the line, the main difference is the capacity, size, the work magnetism and the compensation. 变压器变换电压的目的是为了输送电能，因此容量很大，而电压互感器变换电压的目的，主要是用来给测量仪表和继电保护装置供电，用来测量线路的电压、功率和电能，或者用来在线路发生故障时保护线路中的贵重设备、电机和变压器，因此电压互感器的容量很小。 Transform voltage transformer is for the purpose of conveying electrical energy, so the capacity is large, and the purpose of the voltage transformer transform voltage, is mainly used to power meter and relay protection device, used to measure the line voltage, power and energy, or used in the circuit failure protection circuit of expensive equipment, motor and transformer, voltage transformer capacity is small. 电压互感器一般不用于提供电源，但是，它们的确限定了可以接入的额定功率。当现场没有120V电源时，电压互感器经常被用来为轻型的维持设备提供120V的临时电源。在开关室，电压互感器的二次侧可以用来驱动断路器的电机。在调压器室，它们可以用来区分驱动分接开关的电机。电压互感器功率范围是：对于低压电压互感器为500VA及以下，中压互感器为1~3kVA，高压电压互感器为3~5kA。由于电压互感器的额定功率是如此之小，所以，它们的物理尺寸也就很小。 A voltage transformer is not normally used to supply power, but they do limit the power to be connected. When there is no 120V power supply at the scene, the voltage transformer is often used to provide a temporary power supply of 120V for lightweight maintenance equipment. In the switch room, the second side of the voltage transformer can be used to drive the circuit breaker's motor. In the regulator room, they can be used to distinguish the motors that drive the split-switch. The voltage transformer power range is: for the low voltage transformer, the transformer is 1 ~ 3kVA, and the voltage transformer is 3 ~ 5kA. Since the rated power of the transformer is so small, the physical size of the transformer is small.