Electrical Calculation
Electrical Calculation and Electrical Notes on Electrical Engineering:
All Notes ,Calculations & Abstracts are Based on Some Electrical References. All References are mention at end of each Notes.
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Electrical Calculation : .
(1) Cable:
- Calculation of Cable Tray Size
- Calculate Cable Trunking Size
- Calculate Conduit Size for Wire / Cables
- Calculate Cable Size and Voltage Drop
(2) Panel / Bus bar / Relay:
- Calculate Size of Bus bar & Panel Design
- Calculate IDMT over Current Relay Setting (50/51)
- Calculate TC Size & Voltage Drop due to starting of Large Motor
- Calculate Size of Solar Panel
- Calculate Size of Main ELCB/ Branch MCB of Distribution Box
(3) Transmission / Distribution / Transformer:
- culate Size of Circuit Breaker/ Fuse for Transformer (As per NEC)
- Calculation Short Circuit Current (Base KVA Method)
- Calculate Technical Losses of Transmission / Distribution Line
- Calculate Voltage Regulation of Distribution Line
- Calculate Transformer Regulation & Losses (As per Transformer Name Plate)
(4) Earthing / Lighting Protection:
- Calculate Numbers of Plate/Pipe/Strip Earthings (Part-3)
- Calculate Numbers of Plate/Pipe/Strip Earthings (Part-2)
- Calculate Numbers of Plate/Pipe/Strip Earthings (Part-1)
- Calculate Lightening Protection for Building / Structure
- Calculate Size of Neutral Earthing Transformer (NET)
- Calculate Size of Circuit Breaker/ Fuse for Transformer (As per NEC)
(5) Illumination / Street Light / Flood Light:
- Calculate Size of Pole Foundation & Wind Pressure on Pole
- Calculate Street Light Pole’s Distance / Fixture Watt / Lighting Area
- Calculate No of Street Light Poles
- Calculate No of Lighting Fixtures / Lumen for Indoor Lighting
- Calculate Lighting Fixture’s Beam Angle and Lumen
- Simple Calculation of Flood Light, Facade Light, Street Light & Signage Light-(Part-2)
- Simple Calculation of Flood Light, Facade Light, Street Light & Signage Light-(Part-1)
- Calculate Voltage drop for Street Light Poles
(6) Motor:.
- Calculate Size of Cable for Motor (As NEC)
- Calculate Size of Contactor, Fuse, C.B, Over Load Relay of DOL Starter
- Calculate Size of Contactor / Fuse / CB / OL Relay of Star-Delta Starter
(7) Others:.
- Calculate Motor Pump Size
- Calculate Size of Capacitor Bank / Annual Saving & Payback Period
- Calculate Size of Diesel Generator Set
- Calculate Size of Inverter / Battery Bank
- Calculate Required Air ventilation and Heat generation of D.G Set
- Calculate Size of Ventilation Fan
- Calculate Size of Pole Foundation & Wind Pressure on Pole
- Calculate Size of Anchor Fastener for Water Pipe Support
- Calculation of Crippling (Ultimate Transverse) Load on Electrical Pole
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I have doubt in the formula of earthing part 1
The Earth Resistance of Single Rod or Pipe electrode is calculated as per BS 7430:
R=ρ/2×3.14xL (loge (8xL/d)-1)
Where ρ=Resistivity of Soil (Ω Meter),
L=Length of Electrode (Meter),
D=Diameter of Electrode (Meter)
Example:
Calculate Isolated Earthing Rod Resistance. The Earthing Rod is 4 Meter Long and having 12.2mm Diameter, Soil Resistivity 500 Ω Meter.
As per formula I din’t get the value which you have solved.
R=500/ (2×3.14×4) x (Loge (8×4/0.0125)-1) =156.19 Ω.
Please clarify this.
Thanks
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