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Line Capacitance

Calculates per-phase overhead line capacitance from conductor radius and geometric mean phase spacing. The reduced transposed-line method also estimates three-phase charging Mvar per 100 km and surge impedance from an explicit inductance input.

inputs

7 fields

context

2 archetypes

engine

with-tool

outputs

4 scored fields

contract fields

Parameter Map

7 inputs to 4 scored outputs

  • conductor_radius_m

    float

    Physical conductor radius

    0.001 to 0.05m

  • phase_spacing_ab_m

    float

    Spacing between phase A and phase B

    0.2 to 30m

  • phase_spacing_bc_m

    float

    Spacing between phase B and phase C

    0.2 to 30m

  • phase_spacing_ca_m

    float

    Spacing between phase C and phase A

    0.2 to 50m

  • nominal_voltage_kv

    float

    Line-to-line nominal voltage

    1 to 765kV

  • frequency_hz

    floathidden in hard

    System frequency

    16.7 to 60Hz

  • inductance_mh_per_km

    float

    Per-phase line inductance

    0.1 to 3mH/km
geometric_mean_distance_mtol 0.03

Geometric mean distance between phases

capacitance_nf_per_kmtol 0.03

Per-phase capacitance per kilometre

charging_mvar_per_100kmtol 0.03

Three-phase charging reactive power per 100 km

surge_impedance_ohmtol 0.03

Surge impedance from L and C

visibility contract

Difficulty Ladder

all_giveneasy

Distribution line with all geometry visible

all fields visible
all_givenmedium

Distribution or transmission capacitance calculation

all fields visible
partialhard

Frequency hidden in system context

frequency_hz

scenario bands

Archetype Atlas

distribution_line

2 contexts

Medium-voltage distribution overhead line

conductor_radius_m0.004 to 0.015
phase_spacing_ab_m0.5 to 3
phase_spacing_bc_m0.5 to 3
phase_spacing_ca_m1 to 6

rural-feeder / urban-distribution

transmission_line

2 contexts

High-voltage transmission overhead line

conductor_radius_m0.01 to 0.04
phase_spacing_ab_m3 to 15
phase_spacing_bc_m3 to 15
phase_spacing_ca_m5 to 30

132kv-overhead / 330kv-overhead

rendered task

Generation Preview

132kv-overhead-transmission-line-preview

difficulty
hard
visibility
partial
archetype
transmission_line
site context
132kv-overhead
instruction excerptline-capacitance_calc.py

visible fields

  • conductor_radius_m0.01 to 0.04 m
  • phase_spacing_ab_m3 to 15 m
  • phase_spacing_bc_m3 to 15 m
  • phase_spacing_ca_m5 to 30 m
  • nominal_voltage_kv110 to 500 kV
  • inductance_mh_per_km0.6 to 1.5 mH/km

withheld schema

frequency_hzgeometric_mean_distance_mcapacitance_nf_per_kmcharging_mvar_per_100kmsurge_impedance_ohm
High-voltage transmission overhead line. 132kv-overhead. Required outputs: geometric_mean_distance_m, capacitance_nf_per_km, charging_mvar_per_100km, surge_impedance_ohm