Operating current

Calculate current based on voltage, power, power factor, or impedance. Supports: Single-phase and three-phase systems Active power → current Apparent power → current Resistance/impedance → current Bilingual support Key Formulas Single-phase: I = P / (V × cosφ) Three-phase: I = P / (√3 × V × cosφ) Single-phase: I = S / V Three-phase: I = S / (√3 × V) Single-phase: I = V / R Three-phase: I = V / (√3 × Z) Example Three-phase system, 400V, 10kW, PF=0.85 → Current ≈ 17.5 A

Calculates the neutral current in a three-phase, four-wire system based on phase currents. Supports: Any three-phase current values Real-time neutral current calculation Bilingual support (Chinese/English) Key Formula I_N = √(I_A² + I_B² + I_C² - I_A×I_B - I_B×I_C - I_C×I_A) Where: I_A, I_B, I_C: Phase currents I_N: Neutral current Example Phase A: 10A, Phase B: 10A, Phase C: 5A → Neutral current ≈ 5.0A

Maximum short-circuit current

Calculates the minimum short-circuit current at the end of a low-voltage circuit, used to verify protective device sensitivity. Supports: Single-phase, two-phase, three-phase systems Copper/Aluminum conductors mm²/AWG units m/ft/yd length units Parallel conductors Key Formula I_sc,min = U / (√3 × (R_L + X_L)) Where: U: System voltage R_L: Line resistance X_L: Line reactance Example Current type: Three-phase Voltage: 400 V Length: 50 m Conductor: Copper, 16 mm² → Minimum short-circuit current ≈ 8.5 kA