RLC Branch (3-phase)

Three-phase series-RLC branch — single component carrying both an EMT trapezoidal R+L+C Norton companion and a load-flow R/X row. Per-phase impedance is series R + jωL + 1/(jωC). Enter each of R, L and C in its own unit, chosen from the dropdown (Ω / kΩ / pu / Siemens for R; H / mH / pu / X reactance / X.pu for L; F / µF / pu / B susceptance / B.pu for C); the pu / reactance / susceptance options read the bases from the Units tab. Set any element to 0 to remove it — the element is shorted out, drawn as a plain wire, and the icon tag shrinks to the elements that remain (e.g. RL when C = 0). Use for short overhead lines, series-compensated lines, transformer-leakage equivalents, or any branch whose per-phase impedance is approximately series-R + L (+ optional series-C). For long cables with significant charging current, use the Transmission Line component (PI / Bergeron).

Category: Three-Phase / Passive

Ports

Name	Direction	Value type	Notes
i	electrical_3ph	double
j	electrical_3ph	double

Parameters

Config

Name	Label	Type	Default	Units	Description
r_ohms	R	double	0.5	Ohms (Ω, kΩ, pu, S)	Per-phase series resistance. Pick a unit from the dropdown; pu / Siemens conversions read the bases from the Units tab. Drives the EMT Norton companion and the load-flow R column (R_pu = R / Z_base on the from-bus side). Enter 0 to remove the resistor (shorted out — drawn as a plain wire).
l_henries	L	double	0.01	H (H, mH, pu, Ω, X.pu)	Per-phase series inductance. Pick a unit from the dropdown; pu / X (Ω reactance) / X.pu conversions read the bases from the Units tab. Drives EMT and the inductive part of load-flow X (X_L_pu = ωL / Z_base). Enter 0 to remove the inductor (shorted out — drawn as a plain wire).
c_farads	C	double	0	F (F, μF, pu, S, B.pu)	Per-phase series capacitance. Pick a unit from the dropdown; pu / B (Siemens susceptance) / B.pu conversions read the bases from the Units tab. Capacitive part of load-flow X (X_C_pu = −1/(ωC·Z_base); series-comp convention). Total X = X_L + X_C. Default 0 = no capacitor (pure series-RL). Enter 0 to remove the capacitor (shorted out — drawn as a plain wire).
measure_current	Measure current	enum (Off / On)	0	—	Emit per-phase branch currents (positive = `i` → `j`). Names on the Current Monitoring tab; blank skips a phase.

Current Monitoring

Name	Label	Type	Default	Units	Description
i_name_a	Current name A	string	Ia	—	Signal name for Phase A branch current. Blank skips this phase.
i_name_b	Current name B	string	Ib	—	Signal name for Phase B branch current.
i_name_c	Current name C	string	Ic	—	Signal name for Phase C branch current.

Units

Name	Label	Type	Default	Units	Description
S_base	S_base (MVA)	double	100	—	System base apparent power in MVA. Used by `pu` impedance / admittance conversions in this component's `computations` block.
V_base	V_base (kV)	double	230	—	Base RMS line-to-line voltage in kV. Used by `pu` impedance / admittance conversions in this component's `computations` block.
Freq	Frequency (Hz)	double	60	—	Frequency in Hz. Used by `B` (susceptance) / `X` (reactance) conversions in this component's `computations` block.

Observables

Signal	Type	Default name	Enable	Description
branchCurrent_a	signal	from i_name_a	measure_current	Phase A series-branch current (A). Positive = current flowing from `i` to `j`.
branchCurrent_b	signal	from i_name_b	measure_current	Phase B series-branch current (A).
branchCurrent_c	signal	from i_name_c	measure_current	Phase C series-branch current (A).