Tech Calc a34y
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How to find Amps Rating?
TRANSFORMER Capacity: VOLTAGE Ratio:
320 KVA 11 KV/ 433
Current Rating: PRIMARY SIDE: KVA=1.732x11KVxI
HV Amps 16.79613689 amps
SECONDARY SIDE: KW=KVAxP.F KW=1.732xVxIxCOSФ
LV Amps 256 kw 426.6916992 amps
APFCR Capacity: VOLTAGE Ratio: kvar=VISinФ CosФ Angle SinФ
Current Rating
2500 KVAR 433 Volt
0.8 36.86989765 0.6
103.92 Amps
v
dg Capacity: VOLTAGE:
500 KVA 415 Volts
Current Rating:
KW=KVAxP.F KVA=1.732xVxI
450 Kw 695.6231 Amps
UPS BACKUP CALCULATION GIVEN: INPUT: NEED: Eff: Backup for Full Load
24V 220VAC 90% 6 to 12 hr 3kw
3000
How to cal calculate AH? Ans: don’t know how did they calculate 3333w from 3000w 3333w 24v kw=VI 138.875 AMPS Hrs to backup 6 12 Ah . Reqrd 833.25 1666.5 Calculate to below percentage of discharge for 6 hr 80% discharge of battery -Give Normal life 50% discharge of battery -Give Long Life
0.8 0.5
for 12 hr
1041.563 2083.125 AH 1666.5
3333 AH
UPS BACKUP CALCULATION GIVEN: INPUT: NEED: Eff: Backup for Full Load
Load Details 24V 220VAC 90% 6 to 12 hr 310
Load Watts Qty Fan 75 Tube light 40 3000
How to cal calculate AH? Ans: don’t know how did they calculate 350w from 310w 350w 24v kw=VI 14.58333 AMPS Hrs to backup 6 Ah . Reqrd 87.5 Calculate to below percentage of discharge 80% discharge of battery -Give Normal life
0.8
109.375 Ah Reqrd for 6 hr
50% discharge of battery -Give Long Life
0.5
175 Ah Reqrd for 6 hr
Total 2 4
150 160
Total watts
310
w
UPS BACKUP CALCULATION GIVEN: INPUT: NEED: Eff: Backup for Full Load in VA Ahr given Calculate Backup time? Ans:
Hrs to backup Ah . Reqrd
24V 220VAC 90% ? 875 185 AH
700w kw=VI 29.16667 5.074286 148
700 watts
24v AMPS Hr AH
Amps per hr can taken Ah=Ampsxhr
Calculate to below percentage of discharge 80% discharge of battery -Give Normal life
0.8
185 Ah Reqrd for 6 hr
50% discharge of battery -Give Long Life
0.5
296 Ah Reqrd for 6 hr
final AH=Ah/80%discg
Load Details Load Watts Qty Fan 75 Tube light 40 w
Total 4 10
300 400
Total watts
700
LOAD CURRENT CALCULATION LOAD IN KVA LOAD IN KW VOLTAGE 3Ф LOAD CURRENT 1Ф LOAD CURRENT
108 86.4 415 150.2546 469.5652
KVA KW V Amps Amps
60% of full Load Current
51.84 kw 90.15276 Amps
86.4 KW
KW=1.732*V*I*COSФ KW=V*I*COSФ
RUNS CABLE CURRENT RATING 90% OF CURRENT RATING
270 486
Total Current 2 540
Feeder
Load
Nos 18
30
90
Total load Per Feeder 3DB
Total
4.3
1000 watts 750 333.3333
77.4
1.333333
1
TRANSFORMER Capacity: VOLTAGE Ratio:
320 KVA 11 KV/ 433
Current Rating: PRIMARY SIDE: KVA=1.732x11KVxI
HV Amps 16.79613689 amps
SECONDARY SIDE: KW=KVAxP.F KW=1.732xVxIxCOSФ
LV Amps 256 kw 426.6916992 amps
APFCR Capacity: VOLTAGE Ratio: kvar=VISinФ CosФ Angle SinФ
Current Rating
2500 KVAR 433 Volt
0.8 36.86989765 0.6
103.92 Amps
v
dg Capacity: VOLTAGE:
500 KVA 415 Volts
Current Rating:
KW=KVAxP.F KVA=1.732xVxI
450 Kw 695.6231 Amps
UPS BACKUP CALCULATION GIVEN: INPUT: NEED: Eff: Backup for Full Load
24V 220VAC 90% 6 to 12 hr 3kw
3000
How to cal calculate AH? Ans: don’t know how did they calculate 3333w from 3000w 3333w 24v kw=VI 138.875 AMPS Hrs to backup 6 12 Ah . Reqrd 833.25 1666.5 Calculate to below percentage of discharge for 6 hr 80% discharge of battery -Give Normal life 50% discharge of battery -Give Long Life
0.8 0.5
for 12 hr
1041.563 2083.125 AH 1666.5
3333 AH
UPS BACKUP CALCULATION GIVEN: INPUT: NEED: Eff: Backup for Full Load
Load Details 24V 220VAC 90% 6 to 12 hr 310
Load Watts Qty Fan 75 Tube light 40 3000
How to cal calculate AH? Ans: don’t know how did they calculate 350w from 310w 350w 24v kw=VI 14.58333 AMPS Hrs to backup 6 Ah . Reqrd 87.5 Calculate to below percentage of discharge 80% discharge of battery -Give Normal life
0.8
109.375 Ah Reqrd for 6 hr
50% discharge of battery -Give Long Life
0.5
175 Ah Reqrd for 6 hr
Total 2 4
150 160
Total watts
310
w
UPS BACKUP CALCULATION GIVEN: INPUT: NEED: Eff: Backup for Full Load in VA Ahr given Calculate Backup time? Ans:
Hrs to backup Ah . Reqrd
24V 220VAC 90% ? 875 185 AH
700w kw=VI 29.16667 5.074286 148
700 watts
24v AMPS Hr AH
Amps per hr can taken Ah=Ampsxhr
Calculate to below percentage of discharge 80% discharge of battery -Give Normal life
0.8
185 Ah Reqrd for 6 hr
50% discharge of battery -Give Long Life
0.5
296 Ah Reqrd for 6 hr
final AH=Ah/80%discg
Load Details Load Watts Qty Fan 75 Tube light 40 w
Total 4 10
300 400
Total watts
700
LOAD CURRENT CALCULATION LOAD IN KVA LOAD IN KW VOLTAGE 3Ф LOAD CURRENT 1Ф LOAD CURRENT
108 86.4 415 150.2546 469.5652
KVA KW V Amps Amps
60% of full Load Current
51.84 kw 90.15276 Amps
86.4 KW
KW=1.732*V*I*COSФ KW=V*I*COSФ
RUNS CABLE CURRENT RATING 90% OF CURRENT RATING
270 486
Total Current 2 540
Feeder
Load
Nos 18
30
90
Total load Per Feeder 3DB
Total
4.3
1000 watts 750 333.3333
77.4
1.333333
1
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