I belive the impedance and capacitance to ground of the long line results in some sort of resonance with output filter.
Isolation transformers "a delta primary star secondary transfomer on the output of the drive" should solve the issue.
I would connect the shield of cable to that transformer...
Proper solution is to use 2000A rated bus.
3 runs of 600MCM would produce voltage drop over 5% and I do not think any arrangment would provide the ampacity you need.
Check Underground Ampacity calculator @
http://www.mc-group.ca/download.htm
It is for U/G but shows cable configurations - there...
Does any of you use the Autodesk Building Systems for Mechanical/Electrical design.
Does the system work in real life?
I will appreciate info from M&E designers who tried or is using it.
Thank you
Once you select TIF as a printer go to properties (in PLOT dialog box) and set custom resolution as large as you need to get your dpi. I do not now of any limitation the higest I needed was 1600x1200 pixels
During power outage when a 40 HP fan (on a VSD) is on emergency supply I would like to limit its power consumption arbitrarily to 25% nominal to avoid the generator overload.
What is the best, foolproof way to do it?
Create custom icon and use this Diesel string
^C^C_ai_molc;\_-layer;_off;*;;;
it turns all but selected layer off.
experiment with freeze but you may not be able to freeze the current layer, unless you change the "selected" to "current" first - can be done.
You may want to check software from
http://members.rogers.com/mcgroup/download.htm
Or just download
http://members.rogers.com/mcgroup/Uground.zip
It contains tabulated ampacity values for different feeder sizes configurations, plus ambient and cable temperature rating correction factors that...
Try lighting calculator from MC Group
http://members.rogers.com/mcgroup/download.htm
It is very fast, but no frils.
You may try it without registering.
There is also some usefull freeware there
Peebee comments are right on
Additional considerations should be:
-Wet cell usually fails by shorting, failure not trivial to diagnose and may lead to catastrophic failure.
-Wet cell may short the UPS electronics if system is not floating (isolation transformers on input and output.
-Wet cell...
>Ampacity rating of cable in free air, above grade >conduits with Ambient temperature & corresponding >correction factors
Try FREE Ampacity Calculator from
http://members.rogers.com/g.cygalski/download.htm
OR
http://www.execulink.com/~cygalski/download.htm
If you like it you will also like...
Go to
http://members.rogers.com/g.cygalski/download.htm
at the bottom of page point to "Last updated...) link
and click or use the save us option and download the spreadsheet
It is in Excell 2000
Your system does not have to be grounded.
Isolate both power terminals from the chassis and monitor if the isolation is maintained.
If that isolation is breached shut down the battery.
Isolated power cct’s provide the highest level of safety.
Power you employ may be dangerous only if a circuit...
I hope it is 24 times #14AWG
Aluminum is OK.
In some countries galvanized steel tape is also used, as long as it conducts electricity, has decent crosssection, it is OK. Steel will not last as long as copper.
Make sure all bends in the wire are no less than 12" radious.
I would like to change numerical value in text boxes
up and down by a certain increment
using the wheel
Are there any scrol OCX.s or other ways of dooing it?
