Hi All,
We are starting to design a system where the motor control center is feeding power to various motor and other loads at 480Vac. The difference is, we want to include an insulated non-current carrying conductor that will serve as a 'ground-check' conductor. The idea is to land one end of...
Hello fellow sparkies,
I did a search on this site for a similar question and, finding none, thought I'd post it here.
Is it possible to 'shoehorn' a single E300 digital expansion module into a 1-space factor Allen Bradley IntelliCenter bucket that gets its 120 Vac control power from a...
Good day, all....
Looking for some practical advice on whether to integrate a 200 HP PowerFlex 755 VFD as part of a new Allen Bradley Intellicenter, or keep the VFD in it's own cabinet separate from the MCC. I know both can be done, but I'm looking for practical advice either way.
Thanks...
Hello Everyone,
I am in the process of designing a 480V three-phase, 3-Wire + Ground industrial distribution system that will be fed from a 2500 KVA pad mount transformer with a 480V Delta secondary (The delta secondary is being used to create a 30 degree phase shift from a different pad mount...
Do any of you know of an insulation resistance tester (0 - 2500 V) that incorporates a remote dead man switch feature? We are getting ready to do a lot of insulation resistance testing on new construction in an industrial plant. I've been doing megger testing the old school way for years, but...
Hi All...
Not sure this is the right forum for this question but thought I'd take a shot anyway. I'm looking for a graphical software package similar to FlashTrack (facilityresults.com) but which operates on either the iPad or an Android tablet. FlashTrack only operates on Windows. Any...
Hi All,
I have been given the task of installing 15kV power via a 50 ft long borehole, six inches in diameter, from the surface down into an underground limestone mine. The power cable down the borehole is estimated to be a 500 MCM three-conductor cable plus ground. I have never installed a...
I have an existing facility that was built 30+ years ago where the 480V power is supplied by transformers with ungrounded delta secondaries. As such, no equipment grounding conductors were pulled through the conduits between the ungrounded delta transformer secondaries and the motor control...
Hi All,
Do any of you know of a manufacturer of 600V, 3-conductor power cable, Type G-GC (ground plus ground-check) with a galvanized steel or aluminum armor and overall PVC jacket? Needing sizes #10 AWG thru #4/0 AWG. If so, please point me to the manufacturer(s) where I can order.
Thanks in...
Hello All,
I'm looking for some free or nearly free Cad drawings (dwg, dxf, etc.) for various styles of overhead power line pole framing- mostly simple R.E.A. type framing. Any ideas where I can go download?
Thanks!
Ohio Aviator
Galatians 2:20
Hello all...
Here's a question for the group, and an opportunity for someone to tell me I'm crazy. Here's the situation: We are operating a 4,000 HP wound rotor motor that's connected to a dynamic load with quite significant load torque variations. The rotor at present is connected to a liquid...
Hello all,
As I type this I am going nuts trying to deal with GE/Multilin tech. support. We recently sent in an older style SR469 relay for repair and calibration. The relay had a password set when it was sent in for repair. We now have the relay back and are trying to put it in service...
Hello all,
I hope this isn't a silly question, but I just can't seem to noodle this out in my head.
I need to derive a system neutral for a 4,160 Volt Delta industrial power system. The derived neutral will then connect to ground via a neutral grounding resistor. I know that I can use a...
Hello All,
What is the largest horsepower switched reluctance motor and drive out on the market at present? I see that LeTourneau has several wheel mining loaders that use this technology, the largest being about 2,300 HP. Has anyone heard of or seen anything larger? If so, what's the...
Hi All,
Does the NEC permit erecting a pole barn-type steel building on top of an underground concrete encased duct bank that is approx. 4-5 ft. below grade? An 8" slab concrete parking lot covers the entire area. The duct bank does not contain any service laterals; only feeder laterals...
We recently commissioned some new GE AKD-10 switchgear that have WavePro circuit breakers in them. The WavePro circuit breakers are all outfitted with GE's new 'Entelliguard' trip units, instead of their long-standing MicroVersaTrip PM trip units.
Question: Does anybody know of a software tool...
Hello all,
I recently had a problem with a 4.16 Kv, 4,000 HP wound rotor induction motor where the motor started eating brushes like crazy on one slip ring, and greatly accelerated brush wear on a second slip ring.
The surfaces of all three slip rings looked fine, so it wasn't a ring pitting...
Hello all,
I have a need for a loadbreak switch, fused or non-fused, that is rated 2,000 Amps @ 2,400 Volts AC. It needs to be metal enclosed, NEMA 3R outdoor. Of course, I can use a 5kV switch but I definitely need the 2,000 Amp continuous current rating. Anyone know where I can get one...
Situation:
Small industrial facility, two-story building with two motor control centers and one 400Amp main-lug panelboard located on the second floor. Motor control centers are rated 2,000Amp main bus and are also main-lug only.
Located approximately 30 feet away from building at ground level...
Hello All,
Can someone point me in the right direction? I would like to electronically plot the coordinated TCC curves for a simple power system. I only need to coordinate three overcurrent devices (Multilin 469, Multilin MIFII, and Multilin 750), all at the same voltage level.
Instead of...
