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built templatethermal-ratingwith-tool

Static Thermal Rating

Determines the continuous current-carrying capacity (ampacity) of bare overhead conductors by solving the IEEE 738 steady-state heat balance equation: convective and radiative cooling must equal solar heat gain plus ohmic heating. Accounts for wind speed, solar radiation, conductor emissivity, and temperature-dependent air properties to rate transmission and distribution lines.

inputs

9 fields

context

3 archetypes

engine

with-tool

outputs

4 scored fields

contract fields

Parameter Map

9 inputs to 4 scored outputs

  • conductor_diameter_mm

    float

    Outer diameter of the bare overhead conductor

    5 to 50mm

  • conductor_resistance_ohm_per_km

    float

    AC resistance of conductor at 25 deg C

    0.02 to 1.5ohm/km

  • max_conductor_temp_c

    float

    Maximum allowable conductor operating temperature

    50 to 150deg C

  • ambient_temp_c

    float

    Ambient air temperature

    -10 to 50deg C

  • wind_speed_m_s

    float

    Wind speed perpendicular component

    0 to 15m/s

  • wind_angle_deg

    float

    Angle between wind direction and conductor axis (0 = parallel, 90 = perpendicular)

    0 to 90deg

  • solar_radiation_w_m2

    float

    Total solar radiation intensity on surface normal to conductor

    0 to 1200W/m2

  • emissivity

    floatfrom archetypehidden in hard

    Conductor surface emissivity (0 = shiny new, 1 = fully weathered)

    0.2 to 0.9

  • absorptivity

    floatfrom archetypehidden in hard

    Conductor surface solar absorptivity (0 = fully reflective, 1 = fully absorbing)

    0.2 to 0.9
convective_cooling_w_mtol 0.05

Convective heat loss per unit length (W/m)

radiative_cooling_w_mtol 0.05

Radiative heat loss per unit length (W/m)

solar_heat_gain_w_mtol 0.05

Solar heat gain per unit length (W/m)

ampacity_atol 0.03

Steady-state ampacity (A)

visibility contract

Difficulty Ladder

all_giveneasy

Low wind, no solar, all params given including emissivity and absorptivity

all fields visible
all_givenmedium

Full weather conditions, all params given

all fields visible
partialhard

Emissivity and absorptivity hidden, agent must infer from conductor age and conditions

emissivityabsorptivity

scenario bands

Archetype Atlas

light_distribution

2 contexts

Light distribution line with small new ACSR conductor (recently strung, minimal weathering)

conductor_diameter_mm5 to 15
conductor_resistance_ohm_per_km0.5 to 1.5
max_conductor_temp_c50 to 80
wind_speed_m_s0.5 to 5

regional-australia / rural-new-zealand

medium_subtransmission

2 contexts

Subtransmission line with medium ACSR conductor aged in service (10+ years weathered surface)

conductor_diameter_mm15 to 30
conductor_resistance_ohm_per_km0.1 to 0.5
max_conductor_temp_c75 to 100
wind_speed_m_s0.5 to 8

sydney-western-corridor / melbourne-northern-ring

heavy_transmission

2 contexts

High-voltage transmission line with large ACSR conductor aged in service (10+ years weathered surface)

conductor_diameter_mm25 to 50
conductor_resistance_ohm_per_km0.02 to 0.15
max_conductor_temp_c80 to 150
wind_speed_m_s0.5 to 15

hunter-valley-transmission / queensland-powerlink

rendered task

Generation Preview

sydney-western-corridor-medium-subtransmission-preview

difficulty
hard
visibility
partial
archetype
medium_subtransmission
site context
sydney-western-corridor
instruction excerptstatic-thermal-rating_calc.py

visible fields

  • conductor_diameter_mm15 to 30 mm
  • conductor_resistance_ohm_per_km0.1 to 0.5 ohm/km
  • max_conductor_temp_c75 to 100 deg C
  • ambient_temp_c-10 to 50 deg C
  • wind_speed_m_s0.5 to 8 m/s
  • wind_angle_deg0 to 90 deg
  • solar_radiation_w_m20 to 1200 W/m2

withheld schema

absorptivityemissivityconvective_cooling_w_mradiative_cooling_w_msolar_heat_gain_w_mampacity_a
Subtransmission line with medium ACSR conductor aged in service (10+ years weathered surface). sydney-western-corridor. Required outputs: convective_cooling_w_m, radiative_cooling_w_m, solar_heat_gain_w_m, ampacity_a