The SZ20 series on-load oil-immersed energy-saving transformer is based on the S20 with an added on-load tap-changing switch. This product can adjust the low-voltage output voltage while energized, automatically maintaining stable output voltage during significant grid fluctuations without affecting downstream equipment operation. It is suitable for unstable rural grids and industrial/mining enterprises requiring long-term stable operation.

Main Features:

Maintains voltage stability through automatic voltage regulation, ensuring stable operation of electrical equipment

Facilitates changes in power supply management models and improves distribution management levels

Optional intelligent on-load tap switch enables:

Real-time regulation: View transformer voltage, current, active power, reactive power, and power factor in real-time via handheld terminal APP

Intelligent judgment: Controller automatically measures voltage and adjusts tap positions to ensure stable system voltage output

Core adopts laminated structure with 45° stepped, five-level fully mitered joints, no punching, improving magnetic circuit, increasing joint area, and reducing magnetic resistance at joints

Compared with S13 transformer, no-load loss reduced by 30–40%, load loss by 20–30%, improving efficiency, reducing grid losses, and enhancing power supply quality

SZ22 series Level 1 energy efficiency oil-immersed distribution transformers can also be produced according to user needs