Indepth Electrical engineering

AC Induction Motor Current Rating Chart (KW, HP, Amps) Induction motors are the backbone of every industry and household. From small appliances (fractional kilowatt motors) to large industrial drives (up to 375 kW and above), induction motors are widely used because of their reliability and efficiency. ·          Low rating motors are available in single-phase (220V) versions for domestic and light commercial use. ·          High rating motors are mostly three-phase (415V) motors, suitable for industrial applications. ·          For very high power requirements, HT (High Tension) induction motors are used. Below is the AC motors current rating chart for common motor sizes at 50 Hz supply frequency . 🔹 AC Induction Motor Current Rating Chart KW Rating Horsepower (HP) Current @ 3-Phase (415V) C...

  Cable Selection Chart for Induction Motors (3-Phase, 415V, 50Hz) When selecting cables for induction motors, it is important to match the motor rating (kW) with the correct cable size to ensure safety, efficiency, and compliance with standards. The following table provides the recommended copper cable sizes for motors at 415V, 50Hz supply frequency. (For aluminium cables, increase the size by 1.5 times that of copper cables.) 📊 Motor Cable Selection Table (Copper Cables) Motor Rating (kW) Full Load Current (A) Recommended Copper Cable Size 0.06 0.21 1 × 3 Core × 1.5 mm² 0.09 0.32 1 × 3 Core × 1.5 mm² 0.12 0.38 1 × 3 Core × 1.5 mm² 0.18 0.58 1 × 3 Core × 1.5 mm² 0.25 0.70 1 × 3 Core × 1.5 mm² 0.37 1.10 1 × 3 Core × 1.5 mm² ...

📘 Codes and Standards for Designing & Selection of Induction Motors Induction motors are rightly called the backbone of modern industry . From manufacturing plants to process industries, they drive almost every critical application. Since motors directly influence plant efficiency, safety, and lifecycle cost, engineers must carefully evaluate them against recognized international and Indian standards during design and procurement. This article lists the major codes and standards applicable to induction motors, along with their scope. 🔹 International Standards for Induction Motors (IEC/DIN/EN) Standard Description IEC 60034-1, IEC 60085, DIN EN 60034-1 General specifications for rotating electrical machines IEC 60034-2, DIN EN 60034-2 Specification of losses & efficiency IEC/EN 61241, DIN EN 61241 Motors in areas with flammable dust IEC/EN ...

Technical Specifications for  400 kVA, 11 kV/433V  Oil-Immersed Distribution Transformer 1. General Requirements Type: Double copper wound, three phase, oil immersed, ONAN cooled Rating: 400 kVA Primary Voltage: 11 kV Secondary Voltage: 433 V Frequency: 50 Hz ± 5% Supply Voltage Variation: ±10% Vector Group: Dyn11 2. Electrical Parameters Impedance (at 75 °C): 5% No-load losses (max): 0.7 kW Full-load losses (max): 5.1 kW Short circuit withstand: 3 sec at 5% impedance Harmonic suppression: 3rd, 5th, 7th harmonics + high-frequency disturbances 3. Thermal Limits Oil temperature rise: ≤ 35 °C over ambient (40 °C) Winding temperature rise: ≤ 40 °C over ambient (40 °C) 4. Insulation & Withstand Levels Power frequency withstand (1 min): 3 kV (433 V side) 28 kV (11 kV side) Lightning impulse withstand: 75 kVp (11 kV side) 5. Tap Changer HT side off-load tapping: ±5% in steps of 2.5% 6. Design Clear...