Line Constants Program Output

Steady-State (Single-Frequency) Output

Detailed (Multi-Frequency) Output

The Line Constants Program can be set to provide an assortment of output data, which can be classified into two types:  Frequency domain data and steady-state (single frequency) data.

Output parameters are written to files with the extension *.out, all of which can be found in the PSCAD Temporary Directory (*.emt) for the case project, following a transmission system solve.  Each output file will possess a unique name, which consists of the line name prefixed to the name of whatever the quantity exists in the file:

<systemname><quantityname>.out

The only exception to this naming rule is the steady-state output file, which does not have a quantity name.

Steady-State (Single-Frequency) Output

A single file is used by the LCP to display data calculated at a single-frequency.  By default, this frequency is the Steady-State Frequency entered in the Transmission Line or Cable Configuration component.  However, this default may also be changed by using the Additional Options component from the Master Library.

A detailed description of this file is provided in Chapter 8 of the PSCAD Manual under the heading Line Constants Files.

Detailed (Multi-Frequency) Output

When solving frequency-dependent transmission systems, the Line Constants Program can be set to provide output details on some frequency-domain system parameters, the type of which is determined by the model used.   When enabled, detailed data is written to a collection of text files in the PSCAD temporary (*.emt) directory, and each file includes data plotted verses both frequency fk and log(fk).  If the parameter is a matrix or vector, every single element will be included in the file as a distinct scalar quantity.  If the data is complex, then a file will be produced separately, both for the magnitude and phase angle of each matrix or vector element.  In some cases, the calculated frequency-domain quantities are provided alongside the respective curve fitted quantities.  This enables analysis of the curve fitting results and provides feedback for 'tuning' the transmission system.

PSCAD provides a utility called the Detailed Output Viewer, which is programmed specifically for viewing these files.

The parameters written as detailed output depend on the frequency-dependent model being used to solve the system.  The following tables summarize the parameters output for each model:

Common to All Frequency-Dependent Models

Frequency Dependent (Mode) Model

Frequency Dependent (Phase) Model