The rectifier transformer of the intermediate frequency electric furnace adopts a primary high voltage reduction to the input voltage suitable for the intermediate frequency power supply. The primary voltage is 10KV (35KV or 6KV in some areas), and the secondary voltage adopts the DY11, d0 wiring 12 pulse rectification form.

The rectifier transformer is used to reduce a high voltage to an input voltage suitable for intermediate frequency power supply. It adopts a high impedance oil immersed self cooling rectifier transformer, and its model is ZS series.

At present, for the commonly used SCR full bridge parallel inverter intermediate frequency power supply in the industry, the numerical relationship between transformer capacity and power supply value is: transformer capacity value=power supply power value x 1.2

For IGBT half bridge series inverter intermediate frequency power supply (commonly known as one to two, one melting and one insulation, two working simultaneously), the numerical relationship between transformer capacity and power supply is: the value of transformer capacity=the value of power supply x 1.1

Transformers are rectifier transformers. In order to reduce harmonic interference, one rectifier transformer is configured for one intermediate frequency power supply.

At present, due to the regulations of China’s power supply policy, the transformers used for industrial electricity in China are generally S11 type power transformers, with a secondary voltage output of 380V, while the secondary output voltage for foreign medium frequency electric furnaces is 650-780V. If a special transformer for medium frequency induction furnaces is used to make the secondary output voltage 650V, when the output power is constant, the output current will be reduced by 0.585 times, the copper loss will be reduced by about one-third of the original, and the heat generation of the transformer can be reduced, so that the copper coil will not increase in resistance due to high temperature, and the heat carried away by the cooling system will also be reduced, resulting in a significant increase in energy-saving effect. The power supply voltage can be adjusted as needed during the operation of the electric furnace to regulate the input power of the furnace and minimize the losses of the intermediate frequency induction furnace. Therefore, it is imperative to use a medium frequency electric furnace transformer to increase the voltage.

In addition, restricting the no-load operation of transformers can also play a certain role in energy conservation. In practical applications, when the no-load time exceeds a few hours or production stops, the switch should be turned off and the operation of the transformer should be stopped in a timely manner, which is more conducive to energy conservation, consumption reduction, and power factor improvement of the transformer. Suggest using a medium frequency furnace transformer. We need to adopt energy-saving type. Irregular. The secondary voltage is 575V, 660V, 750V, and 950V.