Transmission Line

Synthetic two-port transmission line assembled from a pair of Transmission Line Terminals and their shared Transmission Line Model. Not placed directly — the netlist converter creates it when two terminals sharing a line name are paired. Implements PI (lumped nominal-pi) and Bergeron (travelling-wave) models in single-phase and three-phase forms.

Category: Transmission

Ports

Name	Direction	Value type	Notes
end_a	electrical	double	Visible when number_of_conductors == 1
end_b	electrical	double	Visible when number_of_conductors == 1
end_a3	electrical_3ph	double	Visible when number_of_conductors == 3
end_b3	electrical_3ph	double	Visible when number_of_conductors == 3

Parameters

Name	Label	Type	Default	Units	Description
number_of_conductors	Conductors	enum (1 / 3)	1	—	1 = single-phase (ports end_a/end_b), 3 = three-phase (ports end_a3/end_b3).
model	Model	enum (PI / Bergeron)	Bergeron	—	PI = lumped nominal-pi section. Bergeron = travelling-wave. Set by the converter; the converter falls back to PI when the travel time is shorter than the time step.
R	R (Ω)	double	1	—	Single-phase total series resistance (canonical).
L	L (H)	double	0.1	—	Single-phase total series inductance (canonical).
C	C (F)	double	0.000001	—	Single-phase total shunt capacitance (canonical).
R1	R1 (Ω)	double	3	—	Positive-sequence total series resistance (canonical, 3-phase).
L1	L1 (H)	double	0.09	—	Positive-sequence total series inductance (canonical, 3-phase).
C1	C1 (F)	double	0.0000012	—	Positive-sequence total shunt capacitance (canonical, 3-phase).
R0	R0 (Ω)	double	30	—	Zero-sequence total series resistance (canonical, 3-phase).
L0	L0 (H)	double	0.26	—	Zero-sequence total series inductance (canonical, 3-phase).
C0	C0 (F)	double	8e-7	—	Zero-sequence total shunt capacitance (canonical, 3-phase).

Observables

Signal	Type	Default name	Enable	Description
branchCurrent	signal	from current_name	emit_i1	Single-phase current at terminal end_a, scaled to the chosen unit (A / kA): series-branch current plus the end_a shunt-charging current. Positive 'out of end_a into the line' unless the end-A terminal selects '+ve in'.
branchCurrent_a	signal	from current_name_a	emit_i3	Phase A current at terminal end_a, scaled to the chosen unit (A / kA).
branchCurrent_b	signal	from current_name_b	emit_i3	Phase B current at terminal end_a, scaled to the chosen unit (A / kA).
branchCurrent_c	signal	from current_name_c	emit_i3	Phase C current at terminal end_a, scaled to the chosen unit (A / kA).
branchCurrentB	signal	from currentB_name	emit_i1_b	Single-phase current at terminal end_b, scaled to the chosen unit (A / kA): series-branch current plus the end_b shunt-charging current. Positive 'out of end_b into the line' unless the end-B terminal selects '+ve in'.
branchCurrentB_a	signal	from currentB_name_a	emit_i3_b	Phase A current at terminal end_b, scaled to the chosen unit (A / kA).
branchCurrentB_b	signal	from currentB_name_b	emit_i3_b	Phase B current at terminal end_b, scaled to the chosen unit (A / kA).
branchCurrentB_c	signal	from currentB_name_c	emit_i3_b	Phase C current at terminal end_b, scaled to the chosen unit (A / kA).