A Voltage Transformer (VT for short, Potential Transformer for short PT) is similar to a transformer and is an instrument used to transform voltage.

　　A voltage transformer is an indispensable electrical appliance in power transmissions and power supply systems such as power plants and substations. A precision voltage transformer is an instrument used in the electrical testing laboratory to expand the quantity limit and measure voltage, power, and electric energy. Voltage transformers are very similar to transformers in that they are used to transform the voltage on the line.

　　Why do you need to change the voltage on the line? This is because according to the different conditions of power generation, transmission, and electricity consumption, the voltages on the lines are different in magnitude, and the difference is very different. Some are low-voltage 220V and 380V, and some are high-voltage tens of thousands of volts or even hundreds of thousands of volts. To directly measure these low-voltage and high-voltage voltages, it is necessary to make corresponding low-voltage and high-voltage voltmeters and other instruments and relays according to the size of the line voltage. This will not only bring great difficulties to the manufacture of the instrument, but more importantly, it is impossible to directly make a high-voltage instrument and measure the voltage directly on the high-voltage line, and it is absolutely not allowed.