The difference between voltage transformer type

The most important difference is in the normal working state when operating on different:
1) during normal operation voltage transformer close to saturation flux density, magnetic flux density decreased when failure; current transformer flux density is low during normal operation, the short circuit breakers ue to the primary current becomes large, the magnetic flux density increased significantly, sometimes even as far as

Far exceeding the saturation value.
2) was used to measure voltage transformer special transformer high-voltage grid, it will be required proportion of high voltage is converted to a lower voltage, and then connect to the meter up measurements. Voltage transformer primary voltage either how many volts, while the secondary voltage are generally defined as

100 volts, the supply voltage meter, power transformers ,  and kilowatt hour meter relay coil voltage and voltage required.
3) could short-circuit the current transformer secondary, but not open; voltage transformer secondary can open, but not short-circuit. The large current is converted to the required proportion of low current electrical device called a current transformer. Current transformer secondary side current is generally defined as 5

Security or a security, in order to supply meter, power meter, kilowatt hour meter and relay current coil current.
4) for the second side of the load, the voltage transformer or a small internal resistance negligible, a large voltage transformer can be considered a voltage source; the current transformer has a great resistance, as well as can be infinite resistance that is a current source