Description

This device is used for generating data for the Wideband Line/Cable model “WB m-phase” device. This device accepts Model data file from the Line Data and Cable Data (old) modules. After running and generating model data, the user can reopen the “WB fitter” and visualize the fitting results for the characteristic admittance Yc and the propagation function H. The data generated by this device is referenced in the Wideband Line/Cable model. The convergence tolerance is a relative tolerance; it can be modified when fitting problems are encountered. The default value is acceptable in most cases.

The fitting technique used by this device is described in [1].

Table of Contents

Mask and Parameters

Data Parameters

For portability reasons it is strongly recommended to locate the data file(s) in the same directory or in a directory below this design file. The project directory is the recommended choice.

Name	Description	Unit
Convergence tolerance	Tolerance used in the fitting process	-
Select data file	The location of the EMTP file (lyz or cyz) given by the “WB fitter” device containing the line parameters	-
Run this case to generate model data	Check box to run the case to generate model data	-
View Yc fitting results from previous run	Link option to plot the fitting results of the entries of the characteristic admittance matrix	-
View H fitting results from previous run	Link option to plot the fitting results of the entries of the propagation fucntion matrix	-

Help Parameters

Name	Description				Unit	Variable = {Possible Values}
Model documentation	Link option to to see the description of the device				-

Ports, Inputs, Outputs and Signals Available for Monitoring

Ports

None

Inputs

None

Outputs

None

Sensors

None

Data of a 3-phase transmission line

The following figure shows the geometrical data of a 735-kV transmission line as an example to simulate a 3-phase WB model.

The calculation of the electrical parameters can be done with the Line Data auxiliary module. The lyz generated by the Line Data module is used in the Wideband Line/Cable Fitter to produce a dat file for the WB line model. The fitting results are shown in a text file.

A portion of the dat file generated with the Wideband Line/Cable Fitter is shown next.

Reference

Morched A., Gustavsen B. and Tartibi M.: “A universal model for accurate calculation of electromagnetic transients on overhead lines and underground cables”. Power Delivery, IEEE Transactions, Volume: 14, Issue: 3 , July 1999, pp. 1032 -1038