The model for coupled lines is used to simulate a double-circuit line or two lines with the same right of way.

Coupled Lines Icons and Diagrams

In the model palette, two icons and two diagrams used to represent coupled lines.

Parameter Description

The parameters for coupled transmission lines are the same as for uncoupled lines. The only difference is that the modal transformation matrix of coupled transmission lines is a 6x6 matrix because each bundle of conductors is considered as a separate phase.

List of Available Signals

At acquisition, the following signals are made available by the sensors:

Line Signals

V(a, b, c)_line label_bus label	Voltage of each phase on “bus label” bus (volt);
I(a, b, c,n)_line label_bus label	Currents of each phase and ground on “bus label” bus (ampere). When 2 are connected to the same bus, the inductors of phase d, e and f are used to differentiate the signals. Also, the n1 and n2 neutral indicators will appear.
P_line label_bus label	Active power on “bus label” bus (watt)
Q_line label_bus label	Reactive power on “bus label” bus (var)

Coupled Lines Control Panels

This section shows how to enter data in the control panels of Coupled Lines.

Line Data

Figures 7 - 15 to 7 - 16 show the layout of two coupled lines.

Load File

An EMTP file that contains the physical parameters of the lines (Fig 7 - 2 and 7 - 3) or the resolve matrix by the external software of EMTP can be loaded automatically in the parameter form.

Calculation of Electrical Parameters and Corresponding Control Panel

Calculation of Electrical Parameters

The calculation of electrical parameters of frequency constant parameter lines with their geometric parameters is done by using the Line Generator or the Line Data component from the library. Figure 7 - 9 shows the relevant part of the geometrical parameters.

Example:
Example of a 500-kV three-phase, double-circuit line.
6 bundles of 3 ACSR 1355 MCM conductors, 2 steel ground wire.
The Phase numbering is set to obtain the (6x6) RLC matrices and sequence parameters of the two individual circuits.

Geometric Layout of Two Coupled Lines

Details of a Conductor Bundle for Lines in Figure 7-15

Line Height

Note: In the control panel, the modes are not presented in the same order as that of an EMTP input file. For HYPERSIM®, this order is 2G, 2IL, 2L, 2L, 2L, 2L.