LOAD ANALYSIS |
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Sr.No. | Load Details | Load Type (Non-linear /Motor/ Lighting) | Rated KVA | Quantity | Connected Load KVA | Utilisation Factor | Peak Load KVA | Starting Current | Starting KVA |
Three Phase Load | |||||||||
1 | NIL | ||||||||
Single Phase Load | |||||||||
1 | Equipment Load ( 4X25 A ,50V DC with eff. 0.85 & pf 0.85 ) | Non-linear | 6.92 | 1.00 | 6.92 | 60% | 4.15 | 85% | 5.88 |
2 | Windo Air conditioner ( 10A,230 V AC) | Motor | 2.3 | 2 | 4.6 | 0.5 | 2.3 | 50 | 11.5 |
3 | Tube Fittings (2x40 W) | Lighting | 0.1 | 2 | 0.2 | 1 | 0.2 | ||
Total | 11.72 | 6.65 | |||||||
Total Single Phase Load | 6.65 | KVA | Genset rating | 7.5 | KVA | ||||
Assuming above single phase load equally distributed | 2.22 | KVA | |||||||
Assuming that the largest load is started at last | |||||||||
Base Load on generator | 6.65 - 2.3 | .= | 4.35 | KVA | |||||
KVA required while starting last load | .= | 4.35+11.5 | .= | 15.85 | KVA* | ||||
For Gen set of 7.5 KVA short time capacity is 15 KVA.( 2 times the Rated capacity) | |||||||||
* this value exceeds short time capacity ,hence the Gen set rating is increased accordingly to 10 KVA. | I | ||||||||
Total KVA required at site | 6.65 | KVA | |||||||
Reserve for future | 15% | 1.00 | |||||||
7.65 | KVA | ||||||||
Derating for Altitude 500 m,Temp 40 0 C & Humidity 90% RH | 0.92 | ||||||||
Gen set Rating | 8.32 | KVA | |||||||
Standard available Gen set | 10 | KVA | Single phase | II | |||||
Recommended Gen set capacity | 10 | KVA | Single phase | ||||||
Wednesday 16 July 2014
ENGINE ALTERNATOR SET CAPACITY CALCULATION
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