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Three Phase Fault Current

Computes initial symmetrical (Ik'') and peak (ip) short-circuit currents for a radial network using the IEC 60909-0 simplified method. Sums source, transformer, and cable impedances in series referred to the system voltage level, then applies the voltage factor c and peak factor kappa to determine fault currents for switchgear rating and protection coordination.

inputs

8 fields

context

4 archetypes

engine

with-tool

outputs

6 scored fields

contract fields

Parameter Map

8 inputs to 6 scored outputs

  • system_voltage_kv

    float

    Nominal system voltage at the fault location

    0.4 to 33kV

  • source_fault_level_mva

    float

    Upstream source fault level (short-circuit power)

    50 to 2000MVA

  • transformer_rated_power_mva

    float

    Transformer rated apparent power

    0.1 to 100MVA

  • transformer_impedance_percent

    float

    Transformer short-circuit impedance (uk%)

    4 to 12%

  • cable_resistance_ohm_per_km

    float

    Cable resistance per unit length

    0.05 to 1.5ohm/km

  • cable_reactance_ohm_per_km

    float

    Cable reactance per unit length

    0.06 to 0.15ohm/km

  • cable_length_m

    float

    Cable route length from transformer to fault point

    5 to 500m

  • voltage_factor_c

    floatoptionalfrom archetypehidden in hard

    IEC 60909 voltage factor c for maximum fault current

    1 to 1.1
source_impedance_ohmtol 0.03

Source impedance referred to system voltage (ohm)

transformer_impedance_ohmtol 0.03

Transformer impedance referred to system voltage (ohm)

cable_impedance_ohmtol 0.03

Cable impedance magnitude (ohm)

total_impedance_ohmtol 0.03

Total short-circuit impedance at fault point (ohm)

initial_symmetrical_current_katol 0.03

Initial symmetrical short-circuit current Ik'' (kA)

peak_current_katol 0.03

Peak short-circuit current ip (kA)

visibility contract

Difficulty Ladder

all_giveneasy

LV system, short cable, all parameters given including voltage factor

all fields visible
all_givenmedium

Any voltage level and archetype, all parameters given

all fields visible
partialhard

Voltage factor hidden, agent must determine c from IEC 60909 Table 1

voltage_factor_c

scenario bands

Archetype Atlas

lv_commercial

2 contexts

Low-voltage commercial distribution board

system_voltage_kv0.4
source_fault_level_mva150 to 500
transformer_rated_power_mva0.5 to 2
transformer_impedance_percent4 to 6

sydney-commercial / melbourne-commercial

lv_industrial

2 contexts

Low-voltage industrial motor control centre

system_voltage_kv0.4
source_fault_level_mva200 to 750
transformer_rated_power_mva1 to 5
transformer_impedance_percent5 to 6.5

hunter-valley-industrial / gladstone-industrial

mv_distribution

2 contexts

Medium-voltage distribution switchboard

system_voltage_kv11
source_fault_level_mva250 to 1000
transformer_rated_power_mva5 to 30
transformer_impedance_percent6 to 10

perth-substation / brisbane-substation

mv_heavy_industrial

2 contexts

Medium-voltage heavy industrial switchgear

system_voltage_kv22 to 33
source_fault_level_mva500 to 2000
transformer_rated_power_mva10 to 100
transformer_impedance_percent7 to 12

pilbara-mining / bowen-basin-mining

rendered task

Generation Preview

perth-substation-mv-distribution-preview

difficulty
hard
visibility
partial
archetype
mv_distribution
site context
perth-substation
instruction excerptthree-phase-fault-current_calc.py

visible fields

  • system_voltage_kv11 to 11 kV
  • source_fault_level_mva250 to 1000 MVA
  • transformer_rated_power_mva5 to 30 MVA
  • transformer_impedance_percent6 to 10 %
  • cable_resistance_ohm_per_km0.05 to 1.5 ohm/km
  • cable_reactance_ohm_per_km0.06 to 0.15 ohm/km
  • cable_length_m50 to 500 m

withheld schema

voltage_factor_csource_impedance_ohmtransformer_impedance_ohmcable_impedance_ohmtotal_impedance_ohminitial_symmetrical_current_kapeak_current_ka
Medium-voltage distribution switchboard. perth-substation. Required outputs: source_impedance_ohm, transformer_impedance_ohm, cable_impedance_ohm, total_impedance_ohm, initial_symmetrical_current_ka, peak_current_ka