mshields
Senior Member
- Location
- Boston, MA
I'm looking at a project where we'll be replacing an old service to a hospital. The service at present has switched capacitor banks on each of 2 incomming lines. These two incoming lines are set up in a main tie main arrangement.
A couple of questions. Are switched capacitor banks as relevant today as they ever where. I know we've got better power factors these days on motors but I also know that when they operate on drives as is often the case, they seldom if ever run at full load and that the pf's can be considerably lower at the lower rpm. Still, I don't hear about them much these days.
Does it all depend on whether or not the utility has PF penalty. Is this less common these days?
My second question is this. It's been a long time since I applied these, and I seem to recall a specific concern relating to resonance under some circumstance. Problem is, I can't remember what the concern is. I realize that ones a little out of the blue, but perhaps it will prompt a helpful reply.
Thanks,
Mike
A couple of questions. Are switched capacitor banks as relevant today as they ever where. I know we've got better power factors these days on motors but I also know that when they operate on drives as is often the case, they seldom if ever run at full load and that the pf's can be considerably lower at the lower rpm. Still, I don't hear about them much these days.
Does it all depend on whether or not the utility has PF penalty. Is this less common these days?
My second question is this. It's been a long time since I applied these, and I seem to recall a specific concern relating to resonance under some circumstance. Problem is, I can't remember what the concern is. I realize that ones a little out of the blue, but perhaps it will prompt a helpful reply.
Thanks,
Mike
