Mask and Parameters

Location of data Parameters

Name	Description
Open an existing line case data file or use previously saved (click OK now) data for this device	Provide an existing line data file if you want to modify an existing case or use previously saved data for this device. To open the previously saved version simply click on the OK button, in this case the data is saved within the device and not in a file.
Convert an existing EMTP-V3 data file	Provide an existing EMTP-V3 (AUX) data file if you want to modify an existing old case. This device will try to translate the existing file to create a line case data compatible with HYPERSIM. The user should verify if the translation has been performed correctly by opening the line case data file with the first option on this page. The provided myfile.data will be converted to myfile.lin and can be opened using the fisrt option on this page.
Run an existing line case data file without opening its data	This option allows submitting directly an existing case file to the Line Data Calculation function. It can be also used to run old EMTP-V3 cases without translating them.
Create a new line case	This option allows to create a new case from scratch

Conductor Data Parameters

Once a (new) line case is selected (created), a new window with following parameters is open.

The Data tab allows entering the geometrical and electrical data of the transmission line. This include the electrical data of the conductors, their geometrical placement as well as a general description of the construction of the towers. The normally required information to characterize the transmission line is the geometric location of the conductors and their electrical characteristics. However, when the line geometry is not known, it is still possible to generate reasonably accurate line models from the 60-Hz (or any other specific frequency) positive and zero sequence impedance values.

Name

Description

Unit

Module

Allows to specify the type of data to be generated

Line Model

To generate transmission line models for steady-state and for time-domain studies

Line Parameters

To determine the resistance, inductance, and capacitance matrices for a multiphase overhead transmission line consisting of an arbitrary configuration of conductors

Units

Identify the units used for conductor and line data. To facilitate the data entry, the units are mentioned next to each parameter. Two types of unit systems are allowed

Metric

The SI system of units is used for conductor and line data

English

The English system of units is used for conductor and line data

Input option

The geometry of the conductors and the line data is either

Standard Conductor Data

Specified directly with the Conductor data option

Conductor Data for Line Rebuilt

Rebuilt (Line Rebuild) from the electrical parameters.

Number of conductors

Selects the (N) number of conductors in the current system

Conductor data table

Wire

The wire number

Phase number

The phase number to which the conductor belongs. If more than one conductor is given the same phase number, this means that the conductors are electrically connected (connected in parallel). This is the case, for instance, of individually specified conductors in a bundle. It could also be used, for instance, to internally unite two parallel lines when it is not desired to preserve their individual identity. Phase numbers for conductors must follow the sequence 1, 2, 3,..., N with no missing phases. Set the phase number to 0 for a ground wire (ground is phase number zero, by definition) when the ground wire is not to be considered separately.

DC resistance

DC resistance of the conductor in the specified unit

Ω/km or Ω/mi

Outside diameter

Outside diameter of the conductor

cm or in

Horizontal distance

Horizontal distance of the conductor from the reference point x=0

m or ft

Vertical Height at tower (tower VH)

Vertical height of the conductor above the ground at the tower

m or ft

Vertical Height at Midspan (VH _mid)

Vertical Height of the conductor above the ground at the middle of the span. When both VH _tower and VH _mid are specified, an average height is calculated using the following formula:

m or ft

Additional data for Wire

Allows specifying the data in the next items for each specified wire selected from the number list

Skin effect correction

This option is to consider the skin effect correction of an equivalent tubular conductor. See also the Reactance model data description below for more information.

Thick/Diam

Specify the Thickness/Diameter (T/D) factor which has to be less or equal of 0.5

None

To neglect the skin effect correction

Solid conductor

Assume a solid conductor

Galloway-Wedephol

Use Galloway-Wedephol’s correction formula for stranded conductors. This option is only available for Line Parameters. See the Permeability of outer strand description below.

Bundled conductor

Specify a symmetrical bundle using

Number of conductors in the bundle

Number of conductors

Spacing (cm)

Spacing (SEPAR) between adjacent conductors in the bundle

cm or in

Angular position

Angular position (ALPHA) of the first conductor (or any conductor) of the bundle. Positive angles are measured counter-clock wise

Reactance model data

Specify the model used for the calculation of the internal inductance of the conductor. With the default options the conductor internal inductance is corrected for skin effect assuming tubular conductor geometry. Alternative inductance options are possible that do not correct the conductor’s internal inductance.

Relative permeability

This is the standard case used in both Line Model and Line Parameters calculation. The internal reactance is calculated and corrected for skin effect assuming tubular conductor geometry

Permeability of outer strand

For use with Galloway-Wedepohl's equation for stranded conductors. The user must specify the relative permeability of the outer strand as well as the number of the outer strands in the conductor. This option is only available with Line Parameters

Reactance for unit spacing

The reactance (not the inductance) is assumed to remain constant regardless of the frequency that may be specified in the frequency data. The reactance is in units of Ω/ km for Metric units and Ω/mile for English units. The unit spacing is 1 meter for Metric units and 1 foot for English units. This option is only available with Line Parameters. The name 1-foot spacing is for the case where the spacing among the three phases (expressed as geometric mean distance GMD) is 1 foot, with GMR given in feet as well

Reactance for unit spacing at 60 Hz

Reactance for unit spacing (as above) at 60 Hz. As opposed to the case above where the reactance is assumed to remain constant, it is now the inductance that is assumed to remain at its 60- Hz value. If frequencies other than 60 Hz are specified in the frequency data, the reactance will be changed proportionately. This option is only available with Line Parameters.

Note that the relationship between reactances for 1-foot spacing and GMR (geometric mean radius) is given by:

Line Data

Description

Mask and Parameters

Location of data Parameters

Conductor Data Parameters