High voltage transformer is divided into current transformer, voltage transformer, here is the principle and wiring method of voltage transformer in high voltage transformer.

The ratio of high voltage to voltage is equal to the number of windings in the high voltage side of the winding. And the current transformer on the primary side of the coil turn number, the general is a wire, the two side of a lot of turns, so from the principle of voltage transformer to analyze, if once induction to the low voltage, then the two side if the open circuit will sense to a very high voltage, and the two side of the voltage is not more than 2000V, so the two side is determined not to open. On the other hand, because once and two are connected to the loop, the voltage is equal to one side of the current, the two side of the current is equal to two times the voltage divided by the two side of the resistance, when the first side of the voltage is equal to one side of the resistance * flow current, so the voltage is increased, and the two side current is equal to the voltage divided by the two side resistance, so the two side of the current will increase.

There are many ways of the voltage transformer, the following are common:

1 a single phase voltage transformer is used to measure the connection mode of a relative voltage or phase voltage.

2 using two single phase transformers to connect to a star, also known as V - V connection, to measure the phase voltage, but can not measure the relative voltage, widely used in the following 20KV neutral point is not grounded or by the power grid.

3 YN, YN, d0, d0, YN, y,, 3~220KV,,,, and the secondary winding is used to measure the phase voltage and the relative voltage. A three-phase five pole voltage transformer to replace the above three single-phase three winding voltage transformer to form wiring. In addition to the core, the form and figure 3 are basically the same, generally only for 3~15KV.

4 capacitor voltage transformer connection form.

In the system of neutral point non earthing or arc suppression coil grounding system, in order to measure the relative voltage, the PT primary winding must be connected to the star ground.