ग्राउंड फ़ॉल्ट करंट कैलकुलेटर — सूत्र
## Motor Starting Current
Electric motors draw significantly more current during startup than at full speed. This inrush can be 6-8 times the full-load current.
### Formulas
**FLA (3-phase) = HP x 746 / (sqrt(3) x V x Eff x PF)**
**Starting Current = FLA x Multiplier**
### Starting Methods and Multipliers
- Direct-On-Line (DOL): 6-8x FLA
- Star-Delta: 2-3x (reduced torque)
- Soft Starter: 2-4x (adjustable)
- VFD: 1-1.5x (best control)
Electric motors draw significantly more current during startup than at full speed. This inrush can be 6-8 times the full-load current.
### Formulas
**FLA (3-phase) = HP x 746 / (sqrt(3) x V x Eff x PF)**
**Starting Current = FLA x Multiplier**
### Starting Methods and Multipliers
- Direct-On-Line (DOL): 6-8x FLA
- Star-Delta: 2-3x (reduced torque)
- Soft Starter: 2-4x (adjustable)
- VFD: 1-1.5x (best control)
हल किया गया उदाहरण
10 HP motor, 480 V 3-phase, 90% efficient, PF 0.85, DOL start (6x).
- Motor watts: 10 x 746 = 7,460 W
- FLA: 7460 / (1.732 x 480 x 0.90 x 0.85) = 7460 / 635.6 = 11.7 A
- Starting current: 11.7 x 6 = 70.4 A
- Starting kVA: 70.4 x 1.732 x 480 / 1000 = 58.5 kVA