The voltage of the transformer can be selected according to the needs, and special attention should be paid to the total capacity of the electrical appliances being smaller than the capacity of the safety isolation transformer during use. The capacity of safety isolation transformers currently produced is 0.1-15KVA.
When connecting the three-eye safety socket, the ground terminal of the electrical socket should be connected to the zero lines of the three-phase four-wire system to achieve the purpose of protecting the zero connection.
It can be used for the protection of household appliances, such as washing machines, refrigerators, etc. Because these household appliances work in a humid environment, their metal shells are prone to leakage. But applying this method requires that the ground terminal of the socket is directly connected to the zero lines before entering the house.
There are several wiring methods for three-phase isolation transformers: delta input, star connection output, delta input, delta output, as well as input star, output delta, input star connection, output star connection, what is delta The connection method is simple. The input only has three live wires. The ABC star connection method is that ABCN has one more neutral wire.
The primary side of the transformer is electrically isolated from the secondary side, and the isolation transformer is used to suspend the secondary side to the ground so that the current of the system to the ground is too small to cause personal injury(box type transformer statation).
The most direct effect is to change the voltage. Compared with the ordinary transformer, the primary side and the secondary side form different voltages through different numbers of turns, and they are different windings instead of sharing one winding.
To suppress harmonics, when the three-phase isolation transformer is connected in Y-△, it is beneficial to suppress the third harmonic on the grid side.