Generators and furnaces
Generators and furnaces
(OP)
Hi,
I would like to know whether the induction furnace and ladle furnace loads be connected and operated on a battery of Diesel Generators without any adverse effects.The scenario is this.
2*7MW Induction Furnaces are driven by two nos phase shifting transformers cum converter and inverter combination-24 pulse.The phase shifting transformers are connected to 13.8KV bus.There are two such IF set ups are proposed.
The DGs are of 480V 1MW capacity.The DGs will be connected to a 13.8KV bus through step up transformers.All other loads like ladle furnace and plant loads are fed thro' 13.8kv bus only. The number of DGs will depend upon the connected load.
Nature of loading and operating power factor is very much fluctuating due to the process.Moreover,is the harmonics mitigation ie.,24pulse, reasonably effective?Is the battery of Diesel Generators strong enough a source to handle such kind of loads?What precautions to be taken or system improvements to be done?
Any advice will be helpful.
I would like to know whether the induction furnace and ladle furnace loads be connected and operated on a battery of Diesel Generators without any adverse effects.The scenario is this.
2*7MW Induction Furnaces are driven by two nos phase shifting transformers cum converter and inverter combination-24 pulse.The phase shifting transformers are connected to 13.8KV bus.There are two such IF set ups are proposed.
The DGs are of 480V 1MW capacity.The DGs will be connected to a 13.8KV bus through step up transformers.All other loads like ladle furnace and plant loads are fed thro' 13.8kv bus only. The number of DGs will depend upon the connected load.
Nature of loading and operating power factor is very much fluctuating due to the process.Moreover,is the harmonics mitigation ie.,24pulse, reasonably effective?Is the battery of Diesel Generators strong enough a source to handle such kind of loads?What precautions to be taken or system improvements to be done?
Any advice will be helpful.





RE: Generators and furnaces
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: Generators and furnaces
There are totally 48*1MW Diesel Generators planned, out of which 32 DGs will be catering to two sets of 2*7MW Induction furnace,16MW/set.Rest of the DGs will be catering Ladle Furnace and other plant loads.The main concern is inspite of the DG installed capacity whether they can handle the fluctuation in loading,voltage,frequency ,power factor and harmonics,as the entire system is NOT connected to the Grid.
RE: Generators and furnaces
I suggest you speak to Cummins or Caterpillar who have experience of large multi-machine generator farms and see what their applications people have to say. Or do you work for one of them...?
RE: Generators and furnaces
I have used a line fed AVR to maintain service while waiting for replacement parts for the PMG.
32 sets trying to run in parallel with a fluctuating load is scary.
I would consider upping the set capacity to 5 MW to 10 MW.
Normal settings for reverse power protection may not be suitable.
I would consider islanding the furnaces.
It may be well to increase the droop settings on the governors to soften the effect of fluctuations on the diesels. This is another reason to island the furnace generators from the other plant loads.
An old style saturable transformer type AVR with current compensation may be beneficial. I have only seen a few and they were dependable and trouble free. Is anyone else familiar with these AVRs?
They may be used with a brushless exciter.
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: Generators and furnaces
I am not working for any DG manufacturers.I had come across a client who had been weighing different options for their proposed steel plant whether to run the plant exclusively with locally operated DG sets or combination of grid and DGs. Whatever be the combination, the possibility of the grid getting separated or grid failure can not be ruled out.Another grid source as a back up,if available,might overcome that problem.
Any var compensation and harmonic filters will help to reduce voltage and frequency excursions?And the grid voltage level?
RE: Generators and furnaces
Beyond that, it seems very ineffecient and problematic to use 32 small diesel generators instead of a few large generators.
RE: Generators and furnaces
But what exactly are the ladle furnaces mentioned? More info needed here.
rasevskii
RE: Generators and furnaces
A ladle furnace is a type of arc furnace - in the UK they are frequently called 'ladle arc furnace'. At least one of the offenders across the fence from our generating station was a ladle arc furnace - they are a really messy load!
RE: Generators and furnaces
Keith Cress
kcress - http://www.flaminsystems.com
RE: Generators and furnaces