I am about to do a load transfer on a UPS and I noticed a "Static Switch Unable" alarm on an old Emerson UPS. I believe we also get alarms on the newer Liebert UPS ("Not OK to Transfer"). I would like to understand why this is happening. When the generators that support the Emerson & Liebert...
I have a system where the generators are a seperatly derived system and the utilty feeds the normal and generator the emergency.
From the xfmr switch for a number of reasons it feeds another transfer switch. (all loads are have are 4w+g)
So the long and short in a 4W+G system can a four pole...
I have a 4w+G system in which generators and utility feed a common 3P automatic transfer switch. The load then goes to a 3w+G switchboard and then to another 3P transfer switch.
The utility is 2000kVA OA, 12470 pri Y 480/277v sec and the Generators are connected Y through a 3 pole transfer...
In my industrial plant I have (4) 480V 4W+G 2000kW .8pf generators that all terminate in paralleling switchgear. From the switchgear we go to closed transition switches and that feeds the loads.
Question:
I went through the shop drawings which are about 2 years old and noticed know bus...
I know the differences (at least i think) between these but not to sure which one would be better for (4) paralleling of 480V, 2500kVA, 4w+g generators.
I have never installed any switchgear by siemens. I normally don't like to use them-mostly from here say from my older colleges. It seems like they take the cheap route and taper bus and etc.
I am curious what the rest of the world thinks of siemens and would they allow it in their buildings?
Can you open/close a circuit breaker remotely in a Kirk key system. It is a main tie main and if the keys are in both mains can I operate the circuit breakers?
I did a coordination study for an existing system and found a switchgear assembly rated for 30kA and it is a 480/277V 2000A and has the ability to recieve over 90kA of fault current.
This isn't safe and I assume needs to be fixed immediatly.
The solution I have come up with is provide CLF...
Yesterday we turned commercial power off to an older piece of switchgear and it is a Main-Tie-Main and when the left side main went away so did the control power – I am assuming they don’t have a rollover control power scheme otherwise this wouldn’t have happened. To solve this problem I was...
I have two utility feeds from 1500kVA transformers that terminate in new switchboard with LVPCB
Also generator paralleling gear with 1200kVA worth of generator. The generators (3) sync up and parallel with each other and then terminate on new main switchboard.
The main question lies with a...
