zichang voltage stabilizer series regulates voltage through a series of transformers. A static control circuit drives the variable autotransformer that supplies the required voltage to a series transformer, either in phase or out of phase, to bring the mains to the rated value. 

Three-phase stabilizers are available in two versions:
The models zichang and zichang perform voltage regulation by an average of three phases and are suitable for lines with balanced voltage and for an unbalance between phases up to 50%. These models are equipped with one stabilizing circuit to ensure a common regulation of the three-phase and may be connected to input mains without neutral.

The models zichang and zichang are equipped with one stabilizing circuit for each phase and are suitable for unbalanced mains with a maximum unbalance between phases up to 100%. For correct operation, the input line must be three-phase + neutral. Voltage regulators do not transform the voltage and therefore have the same output voltage as the input. When input and output voltages are different, an additional isolating transformer or auto-transformer is required.