I'm needing a good rough estimate of the cost per mile to build a 50 mile 138KV, 1272 ACSR transmission line in the central US excluding land acqusition cost? Route is straight, land is flat, mostly open range and sparsly populated. Considering wooden H-frame or concrete structures. Sorry, I...
We are having problems in the field with drive trips, fuses blowing,etc caused by high level 5th order harmonics on our lines. With over 1000 6 pulse vfds installed and little or no filtering on the drives, the voltage distortion is really bad.
The thought is to have half of the sites pole top...
A couple of days ago we had a failure of a GE 1000 hp extruder motor on one of our films lines here in our plant. The motor had a lot of water and ice ingested into the air intake from the roof during the snow storm shorting out 2 of the 6 motor field windings.
The motor shop says the repairs...
We had a driveshaft failure that bent the worm shaft on a Flender Cavex CFW 250 gear reducer ratio 16.67:1. We have ordered a gearbox from Flender but it won't ship until mid-December.
Anyone have an idea where to look for an emergency replacement gearbox maybe on the surplus market...
We recently had a GE 600HP DC motor suffer overheating and destruction when the cooling air intake became blocked by debris. During the the investigation it was discovered that the motor overtemperature devices (thermistor - GE p/n 36A172828BBG01) were not configured to work with the Siemens...
I am researching methods to retrofit a bunch of dc motors in the plant with indicator lights to let someone know when its time to replace brushes in the motor.
I see where one of the brush manufacturers has come out with an embedded sensor in their brushes that can be used to signal an...
We currently have 10 200KVAR capacitor banks scattered around the plant on the 480V side that have failed in the past 25+ years and were not repaired. At the plant service entrance there is a 2250KVAR bank on the 12.5KV side that has been maintained and is working.
Our power factor runs at 0.8...
We have had 3 50HP DC motors fail in the same location in the last 18 months. It has also been noticed that commutator brushes wear out quickly on this motor (3 mo). Failure modes on last 2 motors are shorted field windings and shorted armature windings on most recent failure.
Drive checks...
I need to determine the load rating for Square-Duct metal wireway (8"). The electricians walk on the overhead wireways on occassion and the question of whether or not the wireways provide adequate support has come up. I don't see a specification for this in the technical documentaion.
From...
We lost a GE 800hp motor on an extrusion line this week when the commutator flashed over. The motor brushes were completely worn away on the A- racks and the A+ brushes were almost gone.
We measure brush lengths every 90 days so the failure caught us by suprise.The National Electrical Carbon...
Does anyone have experience with in-line filtering of hot oil. I am looking for a basket strainer to put in the flow to trap contaminants. This is a positive displacement pumping system that flows 25 gpm at 475F. Fluid capacity is about 25 gallons. Viscosity of the oil is about 0.85 of water.
Two days ago, we experienced a failure of an 800 amp Square-D moulded case circuit breaker that vaporized the A phase stab connector and bus bar connection. Three large production lines were down as a result. Three IR inspections in the last year (most recent 10/01) failed to identify a hotspot...
We are experiencing severe problems w/ corrosion stress cracks in 1/2" stainless steel flex hoses that supply cooling water to heat/cool jackets on our plastic extrusion lines. The RO water system is a closed loop with make-up that passes through SS coils embedded in a cast aluminum heater...
[b]I need a device to arrest or catch a falling load of approximately 2000 lbs (similar to a fall arrestor for personnel safety). It should use an interia activated brake or catch mechanism like those found in automotive safety belt restraints. Does anyone know of such an animal?
