I was in a medium course for the whole of last week and the trainer mentioned that SF6 filled-switchgear is by far the safest compared to vacuum and air filled. But he could not explain to us why the gas is so good in quenching a flash. I did not need a...
I am doing a motor control upgrade.
The present installation is as follows:-
· 400V, 15 KW, 2pole, 3Ph sq-cage induction motor spinning a high inertia fan.
· Cable from sub-station isolating fuses to the starter and then the motor 6mm sq – a distance of 18 meters
· Fuse rating 80 A
·...
I wish to share some learning with you guys about this failure.It sounds basic but it may help someone.
A week did not go by after posting a question on thread237-176733 about an upgrade I am intending to do of a 40 years old system.
An operator and a mechanical fitter were changing over fans...
I kindly need your input on a project I am doing, pardon me for the long text.
I have 2 furnaces with a common fume-extraction-duct. The duct split in to two (like a ‘Y’) and a fan is fitted on each split for the purpose of redundancy. The fans sit in the ducts but shafts, mechanical torque...
My question is very basic.
We had a big discussion last night with my work mates about 3 phase faults. One engineer said that ALL 3 PHASE FAULTS ARE SYMETRICAL. He even explained that a fault in 3 phases would cause all currents to increase symmetrically and the reverse for voltages. I feel...
I am kindly looking for some good notes on AC/DC drives theory and application and how PLCs are used in this applications.
I have seen a mult-media CD on sale but the price is just to high.
Any one out there who can help me?
Thanyou in advance.
Bestboy
