Info Page - Transmission Line Page 1 of 5

Info Page - Transmission Line Editor

You can use the Info page to specify the transmission line ID, From and To bus ID and kV, In/Out of Service,
Feeder Tag, Name, Description, and Length.

Line Type
The Transmission Line editor type displays information from the transmission line header of the library
selected. It is arranged as follows:

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Source
Source of the transmission line data for the selected line.

Conductor Type
Conductor material. The current types available are listed in the following table

Type Description
AAAC All Aluminum Alloy Conductor
AAC All Aluminum Conductor
AAC/TW All Aluminum Conductor / Trapwire
AACSR Aluminum Alloy Conductor Steel Reinforced
ACAR Aluminum Conductor Alloy Reinforced
ACCC Aluminum Conductor Composite Core
ACCR Aluminum Conductor Composite Reinforced
ACSR Aluminum Conductor Steel Reinforced
ACSR/AW Single Layer Aluminum Conductor Aluminum Clad Steel Reinforced
ACSR/COMP Compact round Aluminum Conductor Steel Reinforced
ACSR/TW Aluminum Conductor Steel Reinforced / Trapwire
ACSS Aluminum Conductor Steel Supported
ACSS/AW Aluminum Conductor Aluminum Clad Steel Supported
ACSS/TW Shaped Wire Concentric Lay Compact Aluminum Conductor Aluminum Steel Supported
AHC Anaconda Hollow Copper
AW Aluminum-Clad Steel Conductor
CU Copper
CW Copper Weld
CWC Copper Weld Copper
GTACSR Gas Type Thermal Resistant ACSR
TACIR Thermal Resistant Aluminum Conductor Invar Reinforced
TACSR Aluminum-Zirconium Alloy Conductor, Steel Reinforced
VR Wind Induced – Motion Resistant Conductor

Base Temp.1 for R

Base Rated Temperature 1 for the Resistance value in degrees Celsius. This temperature plus the rated
temperature 2 are used to calculate the resistance variation for the line at various temperatures.

Base Temp.1 for R

Base Rated Temperature 2 for the Resistance value in degrees Celsius. This temperature plus the rated
temperature 1 are used to calculate the resistance variation for the line at various temperatures.

Frequency

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Line rated frequency in Hz. This value indicates the frequency at which reactance, GMR, and other parameters
are specified by the manufacturer or standard. If the frequency of the system is different, ETAP will
automatically adjust these parameters to the system frequency.

Code
Code name given to a transmission line by the standard or source of data. For most available lines, their code
(for example, bird, flower, city, or sport) has been entered in this field. In the case of the T&D book, since they
do not use the bird names, size-strands has been used for the code.

Size
Line size in AWG, kcmil, or mm2.

Con. # of Strands
Main conductor number of strands.

Info
ID
Enter a unique ID with up to 25 alphanumeric characters. ETAP automatically assigns a unique ID to each
transmission line. The assigned IDs consist of the default line ID plus an integer, starting with the number one
and increasing as the number of lines increase. The default line ID (Line) can be changed from the Defaults
Menu in the menu bar or from the System Manager.

From and To
Bus IDs for the connecting buses of a transmission line are designated as From and To buses. If a terminal of a
branch, From or To, is not connected to any bus, a blank entry will be shown for bus ID. To connect or
reconnect a branch to a bus, select a bus from the list box. The one-line diagram will be updated to show the
new connection after you click OK.

Note: you can only connect to buses that reside in the same view where the branch resides, i.e., you cannot
connect to a bus that resides in the Dumpster or in another composite network.

For 3 Phase Transmission Lines, only 3 Phase buses will be displayed in the drop down lists. For Single
Transmission Lines only single-phase buses will be displayed.

If a branch is connected to a bus through a number of protective devices, reconnection of the branch to a new
bus from the editors will reconnect the last existing protective device to the new bus, as shown below where
Branch X is reconnected from Bus10 to Bus4.

Single Phase Transmission lines can also be connected to Phase Adapters. If the Cable is connected as such,
then the Phase Adapter ID will show in the Primary or Secondary field.

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Next to the From and To bus IDs, ETAP displays the nominal kV of the buses for your convenience.

Condition
Service
The operating condition can be set by clicking on the radio buttons for either In Service or Out of Service. The
engineering properties within the editor of an Out of Service element can be edited like an In Service element;
however, an Out of Service element will not be included in any system studies. When the continuity check is
activated, an Out of Service element is automatically color coded with the deenergized color (theme manager).
The default color for a deenergized element is grey.

Note: The In/Out of Service option is independent of the configuration status. Therefore, you can set a branch
to be In Service for the Base Data and Out of Service in Revision Data.

State
State is used to describe the service status of an element. Certain states have flexible service status like As-
Built, New, Future, Moved and Modified can be both In or Out of Service. Certain states have fixed service
status like Removed, Warehouse, Abandoned, Repair Shop and Other are out of service states.

Connection
Transmission Lines can be defined as 3 Phase or 1 Phase lines by selecting any of the following selections:

3 Phase
Define the line as a three-phase line. This line can be connected only to three-phase buses.

1 Phase
Define the line as a single-phase line.

Equipment
Tag #
Enter the feeder tag in this field, using up to 25 alphanumeric characters.

Name
Enter the equipment name, using up to 50 alphanumeric characters.

Description
Enter the equipment description, using up to 100 alphanumeric characters.

Lock / Unlock

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Click to lock / unlock the editor properties of the current element. When the editor properties are locked, all
engineering data is displayed as read-only except condition information. The user can change condition
information (service & state) even though the element properties are locked.

Length
Length
Enter the length of the transmission line, in the units specified in the Unit field.

Unit
Select the unit from the list box. The units of length available are feet, miles, meters, and kilometers.

Tolerance
Enter the percent tolerance in line length. The Adjustments page in the analysis modules can be used to
consider +/- % tolerance in line length, effectively increasing or decreasing the impedance based on the type of
study being performed.

Transmission Line
Info Page
Parameter Page
Configuration Page
Grouping Page
Earth Page
Impedance Page
Protection Page
Sag & Tension Page
Ampacity Page
Compensation Page
Reliability Page
Remarks Page
Comment Page

AC Elements Editor Overview

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