Concerns noted. Not a utility application. This transfer may take place a few times per year. Operating personnel are electricians who would wear level 4 PPE.
In thinking about it, I may be forced to use some logic or interlocking mechanism to prevent closing into a fault which would be highly...
ok.. Guess I have to go with my gut on this one...Was really trying to avoid double breakers and logic.
Was hoping there was some old school device that could work. This assumption was based on an old Westinghouse 'versarupter' that i had glimpsed in a similar sort of configuration some time...
I have been trying to locate a 13.8kV on-load (Make before break) transfer switch for the last two days that would allow me to swap feeds from two reclosers being fed from the same transformer. The problem is that one is a dedicated feed and the other shared with some other folks.
However, all...
Batteries (lead calcium) are 25yrs vs the 20yr projected life for switchgear control. Preventive maintenance over the last few weeks revealed sudden and repetitive breakdown. Haven't done the investigation as yet but physical evidence include:
1. plate shedding
2. corrosion and cracks
Bank is...
I have station battery bank (56 2.22V cells @130Vdc) that is breaking down rapidly. Replacement batteries are on order but I need an interim measure to survive until then.
Any thoughts on using a deep discharge inductrial battery in the cirucit? What are pros and cons?
I am attempting to realize a stepwise improvement in power factor (0.71 - 0.85) at an aged facility via the installation of capacitors at several low power factor loads. The attempt is to reduce var import from the utility (as well as the other benefits from power factor correction)
Resonance...
Ground current is approx 90A. Were able to reduce down to 20A based on corrective measures.
No ground fault indicator or shunt trip available. Supply is balanced but there are voltage regulation problems...
You're right, I'll try posting in the power engineering forum
Thanks
I am attempting to realize a stepwise improvement in power factor (0.71 - 0.85) at an aged facility via the installation of capacitors at several low power factor loads. The attempt is to reduce var import from the utility (as well as the other benefits from power factor correction)
Resonance...
BobPE,
Was thinking the same thing. Some sort of coagulant or absorbent that can mop up the oil and maybe we can find a way to get it out (vacuum or sweep)?
Whatever the solution it's going to be difficult and time consuming!
This was posed in the motor controls forum. Just want to see what some of the power guys think about this
I have a cable tray located below a few oil filters to a couple of boilers that has been doused with oil over the years that an insurance risk assessment just uncovered.
As the plant EE I...
I am between a rock and a hard place!!
I have a cable tray located below a few oil filters to a couple of boilers that has been doused with oil over the years that an insurance risk assessment just uncovered.
As the plant EE I am faced with the task of correcting within 6 months. Step 1 is to...
Yep, V/Hz ratio prevails as it relates to speed control. Oh! Another complication is that the motor is not inverter duty. So I've got to compensate for that.
The 30hp motor is already coupled to a reduction gearbox etc.. Bottom line is that soft start maybe the way to go. I should be able to...
Ok let me clarify..Yes the SMC is a soft start unit that allows adjustment of ramp time and offers several preset starting modes..similar to other makes like the Saftronics EZ6 etc...
Also I understand that a VFD is basically a freq converter. I have installed several from AB to Control...
Trying to weigh speed control options for a 3ph 220V AC induction motor. The easiest (and more expensive option) is to use a VFD.
However, I want to take up the challenge to implement the most economic solution while not sacrificing too much functionality. Was looking at the SMC-2 controller...
I typically use Raychem HVS or HVT type splice kits....
The electrical infrastructure one of our plants in Guinea is very old and has some unorthodox equipment. I guess I am not old enough to recognize some of them!!!!
However,
I found a solution to the old HV cable issue using a Raychem...
