Electric furnace heating

Furnace transformer is also called“Smelting transformer”, its load is the furnace. Different from ordinary intermediate frequency equipment. This transformer, generally with primary 10KV, secondary as needed in 40 to 130 volts, current from thousands to tens of thousands of amperes have, capacity is usually large. Split, all in one. Use carbon rods as electrodes. Common in electric furnace smelting special steel, white corundum, electrolytic aluminum and so on.

Furnace transformer technical parameters:

(1) one-time rated voltage. This voltage is the voltage that the power supply network adds on the transformer primary coil, namely the standard voltage of the power supply network, mainly has 6 kv, 10 kv, 35 kv and 110 kv.

(2) secondary voltage. The secondary voltage is also called the low-voltage side voltage. Its size and its series mainly depends on the requirements of steelmaking process, its range is generally between 100-1200V.

(3) rated current. The rated current in the low-voltage side coil of the transformer remains constant regardless of the connection mode, while the current in the high-voltage coil changes with the secondary current.

(4) rated capacity. The capacity at the highest secondary voltage is defined as the rated capacity of the arc furnace transformer.

(5) power supply frequency. In China, power supply frequency f = 50hz, but in foreign countries, power supply frequency regulations are different.

(6) the connecting circuit and connecting group of the coil. When the coils are connected into a Y-△ shape or △-△ shape, the connection group numbers are YD11(11 indicates a primary and secondary phase angle difference of 11 °) or DD0(0 indicates a primary and secondary phase angle difference of 0 °) .

(7) efficiency. In general, η = 95% ~ 98% for medium and small transformers, η = 99% for large transformers.