- Contact Person : Ms. Zeng Jenny
- Company Name : Guangzhou COPOWCO Electric Energy Technology Co., Ltd.
- Tel : 86-020-18924100751
- Fax : 86-020-28679517
- Address : Guangdong,Guangzhou,Floor 4,block 3,Gangxin Industrial park, Xinji Country, Nancun Town,Panyu District, Guangzhou.
- Country/Region : China
Intelligent Power Saving Streetlight
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Scheme | Common Streetlight | ENERTEK Streetlight | ||
General Situation | 35m distance,2*400W double-arm streetlights,3 transformers | 42m distance,2*250W double-arm streetlights,2 transformers | ||
Reckoning | Explanation | Reckoning | Explanation | |
Power Supply Radius | 4500÷3÷2=750m | 3 is the quantity of transformer, 2 is double-arm streetlights | 4500÷2÷2=1125m | 2 is the quantity of transformer, 2 is double-arm streetlights |
Streetlights at Each Side of Transformer | 750÷35*2=42.8 | total 44 | 1125÷42*2=53.5 | total 54 |
Apparent power at Each Side of Transformer | 44*400*(1+0.17)÷0.75 =27.45 KVA | 0.17 is the percentage of consumed power of inductive ballast; 0.75 is power factor | 54*250*(1+0.14)÷0.99 =15.54 KVA | 0.14 is the percentage of consumed power of inductive ballast; 0.99 is power factor |
Load Torque | 27.45*750*0.5*1.1*1.15 =13021 KVAM | 0.5 is uniformly distributed load; 1.1 is coefficient of zero line current of three phase imbalance ; 1.15 is coefficient of reserved length of cable | 15.54*1125*0.5*1.1*1.15 =11057 KVAM | 0.5 is uniformly distributed load; 1.1 is coefficient of zero line current of three phase imbalance; 1.15 is coefficient of reserved length of cable |
Percentage of Voltage Loss at Tail End | 13021÷83÷25=6.27% | VV4*25+1*16mm2cable: 25 is sectional area of cable: 83 is load torque coefficient of 1% line drop of 1mm2 copper conductor | 11057÷83÷16=8.32% | VV5*16mm2cable: 16 is sectional area of cable; 83 is load torque coefficient of 1% line drop of 1mm2 copper conductor |
Tail End Voltage | 220-220*6.27%=206.2V | 220-220*8.32%=201.7V | ||
Current-carrying Capacity | 27.45÷380*1000=72.23A | the current-carrying capacity of VV4*25+1*16mm2 cable is 125A, meeting the demand | 15.54÷380*1000=40.89A | the current-carrying capacity of VV5*16mm2p cable is 125A, meeting the demand |
Power of Adopted Transformer | 27.45*2÷0.85=64.58 KVA | adopt 80kVA transformer | 15.54*2÷0.85=36.56 KVA | adopt 50KVA transformer |
Conclusion | This street should adopt 3 sets of 80KVA transformers,5175m VV4*25+1*16mm2 cable,132 lamp-posts, and 264 lamps | This street should adopt 2 sets of 50KVA transformers,5175m VV5*16mm2 cable,108 lamp-posts,216 lamps | ||
Intelligent Power Saving Streetlight
