Arc Furnace at 42000 Ampères - 06/21/08 06:35 AM
Yesterday I was on a site visit at Pacific Steel in Otahuhu, and I was deeply impressed by the enormous power level of the equipment used to melt iron, scrap steel, aggregates to liquid steel, at over 1530 degrees Celsius, and shaped into bars for further processing.
The humming and grunting sound of a transformer working at short circuit conditions and act as a huge arc welder was most impressive. The ground was vibrating as a new arc was struck at a new batch of iron and steel for melting.
This machine was running at between 20 and 25 Megawatts of power level during the process. Every 20 minutes a crucible was ready to be lifted and taken down to the next stage.
The supply to the arc welders comes from a 70 MW Transformer, 110 / 33 kV "dirty" bus section, which feeds the arc furnaces, which are about 25 MW each, continuous, and run at 33 kV at 400-800 Amps at the primary, and 42000 - 56000 Amps at 270 - 330 Volts ac at the secondary.
The supply cables are watercooled to the carbon rods.
The "clean" bus section is supplied from a 40 MW transformer at 110 / 33 kV and feeds local transformers to the shredders and rolling mills. Other supplies are at 11 kV all over the place.
I have put a couple of photo's in the galleries to have a look at.
Also I put a 2½ minute video clip on Youtube under my RODALCO member name.
I can supply the encripted code but am not sure if I'm allowed to post that on ECN.
The humming and grunting sound of a transformer working at short circuit conditions and act as a huge arc welder was most impressive. The ground was vibrating as a new arc was struck at a new batch of iron and steel for melting.
This machine was running at between 20 and 25 Megawatts of power level during the process. Every 20 minutes a crucible was ready to be lifted and taken down to the next stage.
The supply to the arc welders comes from a 70 MW Transformer, 110 / 33 kV "dirty" bus section, which feeds the arc furnaces, which are about 25 MW each, continuous, and run at 33 kV at 400-800 Amps at the primary, and 42000 - 56000 Amps at 270 - 330 Volts ac at the secondary.
The supply cables are watercooled to the carbon rods.
The "clean" bus section is supplied from a 40 MW transformer at 110 / 33 kV and feeds local transformers to the shredders and rolling mills. Other supplies are at 11 kV all over the place.
I have put a couple of photo's in the galleries to have a look at.
Also I put a 2½ minute video clip on Youtube under my RODALCO member name.
I can supply the encripted code but am not sure if I'm allowed to post that on ECN.