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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). Set C = 0 to disable the capacitive term (the branch then behaves as a series-RL). 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
Keywords: 3-phase, 3-ph, 3 ph, 3ph, three, three-phase, three phase, phase, ph, RL, RC, RLC, branch, RX, series, line, load flow, loadflow, EMT
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 (Ω) | double | 0.5 | — | Per-phase series resistance (Ω). Drives the EMT Norton companion and the load-flow R column (R_pu = R / Z_base on the from-bus side). |
l_henries | L (H) | double | 0.01 | — | Per-phase series inductance (H). Drives EMT and the inductive part of load-flow X (X_L_pu = ωL / Z_base). Set 0 to disable. |
c_farads | C (F) | double | 0 | — | Per-phase series capacitance (F). Capacitive part of load-flow X (X_C_pu = −1/(ωC·Z_base); PSSE series-comp convention). Total X = X_L + X_C. Set 0 to disable (= pure series-RL). |
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 | — | Observable id for Phase A branch current. Blank skips this phase. |
i_name_b | Current name B | string | Ib | — | Observable id for Phase B branch current. |
i_name_c | Current name C | string | Ic | — | Observable id for Phase C branch current. |
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). |
Used in samples
Implemented in C++ class SimCompElecRlcBranch3ph (components/electrical/sim_comp_elec_rlc_branch_3ph/sim_comp_elec_rlc_branch_3ph.h).