Street Light Voltage Drop Calculator

"Pole Detail: :Current Detail: SummaryNo of Poles on "R" Ph 6 Nos Load on "R" Phase 18 Amp Total Disatance

No of Poles on "Y" Ph 5 Nos Load on "Y" Phase 15 Amp Total Lighting Load

No of Poles on "B" Ph 3 Nos Load on "B" Phase 9 Amp Total No of PoleTotal No of Poles 16 Nos Total No of Luminar

Street Light Pole Cable Route System Detail Voltage Distribution at each Pole

Pole (From) Pole (To) P.F

A B 415 230 3Ph - 0.75B C 415 230 1Ph R 0.75C D 415 230 1Ph R 0.75D E 415 230 1Ph Y 0.75E F 415 230 1Ph Y 0.75F G 415 230 1Ph B 0.75G H 415 230 1Ph R 0.75H I 415 230 1Ph Y 0.75I J 415 230 1Ph B 0.75J K 415 230 1Ph R 0.75K L 415 230 1Ph Y 0.75L M 415 230 1Ph B 0.75M N 415 230 1Ph R 0.75N O 415 230 1Ph Y 0.75O P 415 230 3Ph - 0.75P Q 415 230 1Ph R 0.75Q NN

System Voltage (P-P)

System Voltage (L-N)

Phase for Pole

Select Phase for Luminar

Street Light Voltage Drop Calculator

Summary :Voltage Drop Detail:0.8 Km Cable Voltage Drop Permissible Actual Status

8 Watt Voltage Drop in R Phase 4.0% 2.42% O.K

16 Nos Voltage Drop in Y Phase 4.0% 1.75% O.K

32 Nos Voltage Drop in B Phase 4.0% 0.74% O.K

Pole Detail Luminar / Fixture Details Cable Detail

Total Watt Amp

1 50 250 2 500 0.9 50.0 11 50 250 2 500 2.9 50.0 11 50 250 2 500 2.9 100.0 11 50 250 2 500 2.9 50.0 11 50 250 2 500 2.9 100.0 11 50 250 2 500 2.9 50.0 11 50 250 2 500 2.9 150.0 11 50 250 2 500 2.9 150.0 11 50 250 2 500 2.9 100.0 11 50 250 2 500 2.9 200.0 11 50 250 2 500 2.9 200.0 11 50 250 2 500 2.9 150.0 11 50 250 2 500 2.9 250.0 11 50 250 2 500 2.9 250.0 11 50 250 2 500 0.9 100.0 11 50 250 2 500 2.9 300.0 1

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Total Distance (Meter)No of

PolePole Distance

(Meter)Each Luminar

(Watt)No of

Luminar/PoleNo of Cable

Run

16 800 32 8000 42.435

Cable Detail

2.29 0.097 0.06%2.29 0.097 0.11%2.29 0.097 0.22%2.29 0.097 0.11%2.29 0.097 0.22%2.29 0.097 0.11%2.29 0.097 0.34%2.29 0.097 0.34%2.29 0.097 0.22%2.29 0.097 0.45%2.29 0.097 0.45%2.29 0.097 0.34%2.29 0.097 0.56%2.29 0.097 0.56%2.29 0.097 0.12%2.29 0.097 0.67%

Jignesh.Parmar www.electricalnotes.wordpress.com jiguparmar@yahoo.com

Voltage Drop Rsistance

(Ω/Km)Reactance

(Ω/Km)

Calculate Distance between Each Street Light Pole

Luminaire Detail:Type of fixture considered 250 WattLumen Output of the Lamp (LL) 33200 LumensLux Required 5 LuxCoefficient of utilization (CU) 0.18Lamp Lumen Depreciation Factor (LLD) 0.8Luminaire dirt Depreciation Factor (LDD) 0.9

Road DetailWidth of the road (W) 11.5 Foot

Height of the pole (H) 26.5 Foot

Spacing between each Pole: 75 FootSpace Height Ratio 3

Calculate Required Power for Street Light Area

Luminaire Detail:Required Illumination Level for Street Light 6 Lux per Sq.Meterluminous efficacy 20 Lumen/Watt

Area Detail:Surface Area 1 Sq.Meter

ORSpherical Radius Meter 1

Required Power 0.3 Watt

Equations:Spacing between each Pole=(LL*CU*LLD*LDD) / Eh*W

Calculate Street Light Luminaire Watt

Street Light & Road DetailRequired Illumination Level for Street Light 6.46 Lux per Sq.MeterWidth of the road (W) 7 MeterDistance Between two pole (D) 50 MeterMaintenance factor (mf) 0.29Coefficient of utilization factor (cu) 0.9luminous efficacy 24 Lumen/Watt

Average Lumen of Lamp (Al) 8663 Lumen

Each Street Light Luminaire 361 Watts

Type of Luminaire Max. spacing/ height Ratio

Cut-off / Full Cut-off 3

Semi-cut-off 3.5Non-cut-off 4

Type of Luminiar Luminous Efficiency Tungsten incandescent light bulb 12.5 to 17.5 Lumen/WattHalogen lamp 16 to 24 Lumen/WattFluorescent lamp 45 to 75 Lumen/WattLED lamp 30 to 90 Lumen/Watt

Metal halide lamp 75 to 100 Lumen/Watt

High pressure sodium vapor lamp 85 to 150 Lumen/WattLow pressure sodium vapor lamp 100 to 200 Lumen/WattMercury vapor lamp 35 to 65 Lumen/Watt

Pay Back Calculation of Lamp

Lamp Parameters Existing Lamp Lamp Replacement Type of Luminar: HPS Induction MHLamp Wattage : (Watt) 118 55 85Fixture Cost: $75 $200 $80Fixture Labor Cost: $150 $150 $150Lamp Cost: $43 $200 $111Lamp Labor Cost: $100 $100 $100Lamp Life: (Hr) 30000 60000 24000Annual Operating Hours: (Hr) 4160 4160 4160Energy Cost Per Kwh $0.15 $0.15 $0.15CO2 Emission (Kg/KWH) 0.9 0.9 0.9CO2 Emission per Annum (Kg/KWH) 441.8 205.9 318.2Capital Cost: $268 $550 $341Annual Energy Consumption (Kwh): 491 229 354Annual Energy Costing $76 $35 $54Annual Maintenance Cost: $20 $21 $37Less Annual CO2 Emission (Kg/KWH) -235.9 -123.6Diffential Capital Cost: -$282 -$73Annual Energy Saving $40 $21Annual Maintenance Saving -$0.97 -$16.74

Simple Payback Period: 7.2 Year 16.6 Year

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Pay Back Calculation of Lamp

Lamp Replacement Retrofit LED

55$200$150$200$100600004160$0.15

0.9205.9 0.0$550 $0229 0$35 $0$21 $0

-235.9 -441.8-$282 $0$40 $0

-$0.97 $0.00

7.2 Year 0.0

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