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` Import of a Ground Grid in AutoCAD to ETAP ` Steps Involved ` Requirements of AutoCAD drawing ` Creating g the ETAP XML File ` Importing the ETAP XML File into an ETAP Project ` Example
FICHTNER
07-Jan-11
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Ground Grid in AutoCAD Drawing ( DWG) File (.DWG)
Select & Export entitles representing conductors and rod
.XML file with conductor and rod d llocation ti and d dimensions
Import .XML File into ETAP
NEW ETAP Ground G id IIn P i Grid Presentation in FEM mode
FICHTNER
07-Jan-11
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Step 1: Modify AutoCAD drawing to map with ETAP compatible ibl elements l Step 2: Create an ETAP Extended Markup Language (XML) file from AutoCAD Step 3: Import the ETAP XML file into an ETAP project
FICHTNER
07-Jan-11
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Modification is required to map earthing layout in AutoCAD drawing with ETAP compatible elements.
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Earth mat conductors shall be Lines.
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Locations of rods (Earth Pit) shall be Circle.
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Rods shall be located at exact locations (which may be shown at the side of conductors as a normal practice)
FICHTNER
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FICHTNER
AutoCAD Entity
ETAP Ground Grid Element
Line
One conductor
Polyline
One or more conductors
Polygon
3-1024 conductors
Rectangle l
4 conductors d
Revision Cloud
One or more conductors
Circle
One rod
Ellipse
One rod
Ellipse Arc
One rod
Blocks
Bl k will ill b l d d and db k d Blocks be exploded broken down iinto one or more AutoCAD entity types listed above.
Other than above
Disregard
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AutoCAD drawing shall be made in different layers
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Earthing Layout shall be made in three separate layers x Layer-1 is for Locations of Conductors (Earthing Mat) x Layer-2 L 2 iis ffor llocations i R Rods d (Earth (E h Pit) Pi ) x Layer-3 is for risers and conductor earth connections (which may be shown as Dot in Normal practice)
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Lock all the layers except Layer-1 and Layer-2 (locations of conductors and rods)
FICHTNER
07-Jan-11
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Change the scale of AutoCAD file to match with ETAP The following table shows length mapping of AutoCAD unit to ETAP unit
FICHTNER
AutoCAD Length
Selected Unit to Create XML File
ETAP length
1 mm
Meters
1 meter
1 mm
Centimeters
1 centimeter
1 mm
Inches
1 inch
1 mm
Feet
1 feet
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Example of Scaling: 1. Change the AutoCAD drawing file to
1 th 1000
2. Select unit as meters while creating XML file. `
Example Calculation (when meter is selected for creation XML file) 1. A length of 300mm shall be scaled to 0.3mm in AutoCAD file 2 3 iin A CAD fil k as 0 3 (i 2. 0 0.3mm AutoCAD file iis taken 0.3meter (i.e. 300mm) in ETAP
FICHTNER
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¾ Open the drawing file having the Ground Grid
ETAP Tools> Export Ground Grid
Click ok to select Conductors and Rods
FICHTNER
07-Jan-11
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¾ Select the Ground Grid from AutoCAD (.DWG) File ¾Then p press “Enter”
Select S l t Following F ll i > Conductor Type > Rod Type > AutoCAD Drawing
U i ** Unit**
FICHTNER
07-Jan-11
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Click ok to convert to .XML File
¾ Once .XML XML file is created a message is displayed as… as
Click ok
¾ A file with the name ETAP_GGS.XML is created in the same location as the _ AutoCAD drawing file Note: If the file already exists, a dialog box is displayed to confirm overwriting it
FICHTNER
07-Jan-11
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¾ Open a New ETAP Project
Drop a ground grid element on the ETAP- OLD
Double-Click on The Element
¾ Select Finite Element Method (FEM) Note: IEEE Method study model does not support import of ground grids FICHTNER
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File > Import From XML File…
Browse and Select ETAP_GGS.XML file
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¾ AutoCAD .XML file Loaded into ETAP is as shown
Note: Check for X, X Y, Y Z co-ordinates co ordinates of all conductors and rods FICHTNER
07-Jan-11
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