# Cable Parameters Tool

Compute RLC parameters of radial copper cables with single screen

## Open the Cable Parameters Tool App

MATLAB

^{®}command prompt: Enter`powerCableParameters`

## Parameters

**Configuration**

`Ground resistivity`

— Ground resistivity

100 (default) | positive scalar

Ground resistivity, in Ohm-meters.

`Frequency`

— Cable frequency

16.7 (default) | positive scalar

Frequency, in hertz, that is used to evaluate RLC parameters.

`Number of cables`

— Number of cables

4 (default) | integer

Number of cables. A cable consists of an inner phase conductor, an outer screen
conductor, and insulator. This parameter determines the dimension of the R, L, and C
matrices as *2N*-by-*2N*, where *N*
is the number of cables.

`Geometric mean distance between cables`

— Geometric mean distance between cables

24.7 (default) | positive scalar

Geometric mean distance between the cables.

#### Dependencies

To enable this parameter, set **Number of cables** to
`2`

or higher.

**Phase Conductor**

`Number of strands`

— Phase conductor strands

58 (default) | integer

Number of strands contained in the phase conductor.

`Strand diameter`

— Phase conductor strand diameter

2.7 mm (default) | positive scalar

Diameter of one strand, in mm, cm, or m.

`Resistivity`

— Phase conductor resistivity

1.78e-08 (default) | positive scalar

DC resistivity of conductor, in ohm*m.

`Relative permeability`

— Phase conductor relative permeability

1 (default) | positive scalar

Relative permeability of the conductor material.

`External diameter`

— Phase conductor external diameter

20.9 mm (default) | positive scalar

Phase conductor outside diameter, in mm, cm, or m.

**Screen Conductor**

`Resistivity`

— Screen conductor resistivity

1.78e-08 (default) | positive scalar

DC resistivity of conductor, in ohm*m.

`Total section`

— Screen conductor total section

0.000169 m^2 (default) | positive scalar

Total section of screen conductor, in mm^2, cm^2, or m^2.

The screen total section value is sometimes provided in datasheets. If you do not know this value, you can compute it as follows:

Total section = pi**r_out*^2 – pi**r_in*^2
where:

*r_out*is the external radius of screen conductor*r_in*is the internal radius of screen conductor

`Internal diameter`

— Screen conductor internal diameter

65.8 mm (default) | positive scalar

Phase conductor outside diameter, in mm, cm, or m.

`External diameter`

— Screen conductor external diameter

69.8 mm (default) | positive scalar

Phase conductor outside diameter, in mm, cm, or m.

**Phase-Screen insulator**

`Relative permittivity`

— Phase-screen insulator relative permittivity

2.3 (default) | positive scalar

Relative permittivity of the phase-screen material.

`Internal diameter`

— Phase-screen insulator internal diameter

23.3 mm (default) | positive scalar

Phase conductor outside diameter, in mm, cm, or m.

`External diameter`

— Phase-screen insulator external diameter

60.6 mm (default) | positive scalar

Phase conductor outside diameter, in mm, cm, or m.

**Outer Screen insulator**

`Relative permittivity`

— Outer screen insulator relative permittivity

2.25 (default) | positive scalar

Relative permittivity of the outer screen material.

`Internal diameter`

— Outer screen insulator internal diameter

69.8 mm (default) | positive scalar

Phase conductor outside diameter, in mm, cm, or m.

`External diameter`

— Outer screen insulator external diameter

77.8 mm (default) | positive scalar

Phase conductor outside diameter, in mm, cm, or m.

**Buttons**

`RLC matrices`

— Compute RLC matrices

button

Computes the RLC matrices for a given cable. After computing the parameters, the app
displays the results in the Computed Parameters section. The obtained results are of the
form of *2N*-by-*2N* RLC matrices that can be directly
used in the block you selected to model your cable. For an example, see the ```
4
Cables with screen (PI model)
```

block in the `power_cable`

example.

`Block`

— Block selector

button

Confirms the block selection. The name of the selected block appears in the field to
the right of the **Block** button.

`Send RLC matrices to block`

— Send RLC matrices to selected block

button

Sends the RLC parameters to the Distributed Parameter Line or
Pi Section Line blocks specified in the **Block**
parameter.

`Send to workspace`

— Block selector

button

Sends the R, L, and C matrices to the MATLAB workspace. The app creates the variables *R_matrix*,
*L_matrix*, and *C_matrix* in your workspace.

**Menu**

`Load Typical parameters`

— Load typical parameters

Load the default cable parameters provided with Simscape™
Electrical™ Specialized Power Systems software. This command opens a browser window
where you can select the `DefaultCableParameters.mat`

file, which
represents the four-cable configuration used in the `power_cable`

example..

`Load User parameters`

— Load user parameters

Opens a browser window where you can select your own cable data. Select the desired MAT-file.

`Save`

— Save cable data

Saves your cable data by generating a MAT-file that contains the GUI information and cable data.

`Help`

— App documentation

Open the documentation page of the app.

## Version History

**Introduced in R2021b**