Megger torkel 820 - Imax, Max Power, and Final Voltage Calculations; Examples of Load Capacities

3 5
T O R K E L 8 2 0 / 8 4 0 / 8 6 0
P r o g r a m m a E l e c t r i c A B
Z P - B S 0 6 E R 1 0 1
Imax
Check that the desired current load is not greater than
the Imax for the TORKEL unit in question (column 2 in
the tables above).
Max power
For the 10 – 480 V range on TORKEL 860, you must
also check to see that current multiplied by maximum
voltage does not exceed the 15 kW power limit.
Final voltage
If the final voltage is lower than the value set forth in
column 4 (in the table above), the internal TORKEL
resistance will limit the current so that it will be impos-
sible to reach Imax (column 2 in the table above). In
such case, you can calculate the current that will be
obtained at the final voltage as follows:
Add the TORKEL internal resistance (column
3) to the cable resistance (which is 1.5 mΩ for
TORKEL 820 and 4 mΩ for TORKEL 840/860 if you
are using standard cables).
Subtract 2.2 V from the final voltage and di-
vide by the resistance you obtained in step one
(above).
Example: The final voltage is 10.8 V, and you want
to find the maximum possible current at this voltage if
you are using a TORKEL 840 and the voltage range is
10 – 27.6 V.
Calculate the resistance as follows:
0.165 Ω + 0.004 Ω = 0.169 Ω .
Calculate the maximum current as follows:
(10.8 V – 2.2 V) / 0.169 Ω = 50.9 A.
Examples of load capacities
TORKEL 820
12 V battery (6 cells)
1)
Final voltage Constant current Constant power
1.80 V / cell (10.8 V) 0 – 121 A 0 – 1.31 kW
1.75 V / cell (10.5 V) 0 – 117 A 0 – 1.23 kW
1.67 V / cell (10.0 V) 0 – 110 A 0 – 1.10 kW
24 V battery (12 cells)
1)
1.80 V / cell (21.6 V) 0 – 270 A 0 – 5.8 kW
1.75 V / cell (21.0 V) 0 – 266 A 0 – 5.59 kW
1.60 V / cell (19.2 V) 0 – 241 A 0 – 4.63 kW
48 V battery (24 cells)
1)
1]
2]
1.80 V / cell (43.2 V) 0 – 270 A 0 – 11.6 kW
1.75 V / cell (42.0 V) 0 – 270 A 0 – 11.3 kW
1.60 V / cell (38.4 V) 0 – 259 A 0 – 9,9 kW
1) 2.15 V per cell when test starts
TORKEL 840/860
12 V battery (6 cells)
1)
Final voltage Constant cur-
rent
Constant
power
1.80 V / cell (10.8 V) 0 – 50.0 A 0 – 0.54 kW
1.75 V / cell (10.5 V) 0 – 49.0 A 0 – 0.51 kW
1.67 V / cell (10.0 V) 0 – 46.0 A 0 – 0.46 kW
24 V battery (12 cells)
1)
1.80 V / cell (21.6 V) 0 – 110 A 0 – 2.37 kW
1.75 V / cell (21.0 V) 0 – 110 A 0 – 2.31 kW
1.60 V / cell (19.2 V) 0 – 100 A 0 – 1.92 kW
48 V battery (24 cells)
1)
1.80 V / cell (43.2 V) 0 – 110 A 0 – 4.75 kW
1.75 V / cell (42.0 V) 0 – 110 A 0 – 4.62 kW
1.60 V / cell (38.4 V) 0 – 110 A 0 – 4.22 kW
110 V battery (54 cells)
1)
1.80 V / cell (97.2 V) 0 – 110 A 0 – 10.7 kW
1.75 V / cell (94.5 V) 0 – 110 A 0 – 10.4 kW
1.60 V / cell (86.4 V) 0 – 110 A 0 – 9.5 kW
120 V battery (60 cells)
1)
1.80 V / cell (108 V) 0 – 110 A 0 – 11.9 kW
1.75 V / cell (105 V) 0 – 110 A 0 – 11.5 kW
1.60 V / cell (96 V) 0 – 110 A 0 – 10.5 kW
220 V battery (108 cells)
1)
1.80 V / cell (194 V) 0 – 55 A 0 – 10.7 kW
1.75 V / cell (189 V) 0 – 55 A 0 – 10.4 kW
1.60 V / cell (173 V) 0 – 51.0 A 0 – 8.82 kW
240 V battery (120 cells)
1)
1.80 V / cell (216 V) 0 – 55 A 0 – 11.9 kW
1.75 V / cell (210 V) 0 – 55 A 0 – 11.5 kW
1.60 V / cell (192 V) 0 – 55 A 0 – 10.5 kW
1) 2.15 V per cell when test starts
TORKEL 860
UPS battery (180 cells)
1)
(TORKEL 860)
1.70 V / cell (306 V) 0 – 38 A 0 – 15 kW
1.60 V / cell (288 V) 0 – 38 A 0 – 15 kW
UPS battery (204 cells)
1)
(TORKEL 860)
1.80 V / cell (367 V) 0 – 34 A 0 – 15 kW
1.60 V / cell (326 V) 0 – 34 A 0 – 15 kW
1) 2.15 V per cell when test starts