Features and Application of Split Transformer

The split transformer is a power equipment that consists of several branch windings in parallel to form a total low-voltage winding to convert the voltage to the high-voltage winding for power supply.

We all know that the working principle of the transformer is to generate magnetic induction through the coil winding, and then the secondary coil converts the magnetic induction into AC power. The working principle of split multi-transformer is the same as that of ordinary transformers. All of them can generate electrical energy conversion through the principle of electromagnetic conversion.

The difference is that the split transformer is composed of multiple coils in parallel, and at the same time provides electromagnetic induction to a large coil to convert electrical energy.

The main function of the split transformer is that multiple generators input electrical energy to the power supply coil. The multiple coils are arranged in a certain pattern to convert the electrical energy into magnetic energy, and then the magnetic energy is converted into electrical energy through a secondary coil. A low-voltage power supply, high-voltage output function.

Ⅰ. Application of split transformer:

1. When two generators send power to the system through a split transformer, the split impedance of the split transformer effectively increases the impedance between the two generators, thereby achieving the purpose of reducing short-circuit current.

2. When a split transformer is used to divide into two branches to supply power to two independent busbars, the split impedance also makes the two busbars have a larger impedance to reduce the mutual influence when the busbar is short-circuited. 

Ⅱ. Features of split transformer:

1. When a short circuit fault occurs in one branch of the split winding, the bus voltage drop of the other branch is very small, that is, the residual voltage is relatively high, which is the main advantage of the split transformer.

2. It is conducive to the improvement of the self-starting conditions of the motor. The through impedance of the split transformer is smaller than the short-circuit impedance of the ordinary transformer, so the voltage drop of the transformer when the starting current flows is smaller, allowing the motor to have a larger starting capacity.

3. The effect of limiting short-circuit current is significant. When a branch of the split winding is short-circuited, the short-circuit current passes through the half-through impedance. The half-through impedance is equal to the sum of the high-voltage winding and the short-circuit impedance of a branch, equal to one plus a quarter of the splitting factor, multiplied by the through impedance. That is to say, the half-through impedance is larger than the through impedance by a quarter of the splitting factor, which is larger than the short-circuit impedance of an ordinary transformer, so the short-circuit current is small.