By investigating the transformer parameters of 60 t LF in a steelmaking workshop and combining with the selected test GCr15 steel LF process characteristics

the software is developed

and its electrical power characteristic curve is calculated

two power supply schemes that are suitable for the LF with the fastest heating speed and relatively power saving and the most economical power consumption are proposed. The first power supply scheme

at slagging and heating phase in the first stage the 4 stages (220 V) voltage and 18-20 kA phase current are adopted

and at heating phase in the second stage the 3 stages (240 V) voltage and 20 kA phase current are adopted

which is suitable for LF secondary power supply with fast production rhythm and relatively power saving. In the second power supply scheme

the5-grade(203 V)voltage and 17- 19 kA current power supply system are adopted in the first stage of slag melting and heating up; in the second stage of heating up

the 4-grade(220 V)voltage with 18 kA current is adopted; in the third stage

the heat preservation period is the same as the first power supply scheme

it can be applied to most of the production rhythm not too tight heats. Compared with the index before the test of the power consumption per ton of CCr15 steel and energy consumption per unit weight of molten steel temperature rise

the main energy consumption is reduced by8.51% and7.29% respectively

and the heating rate is increased by 8. 14%.