2. A 480-V industrial facility is fed by a 2000-kVA, 6% transformer. The total load in the facility is 1200 kVA with a power factor of 0.70 lagging. Determine the following:
a. The required capacitor size to improve the power factor to 0.95 lagging
b. The steady state voltage rise due to the capacitor
c. In the real world, a low voltage 3-phase capacitor is connected in delta. Construct the power factor correction capacitor from the common capacitor units shown in Table 5.1 below.
Table 5.1 Typical voltage and reactive power ratings.
Volt,rms (terminal-to-terminal) | kvar | Number of phases
216 | 5, 7 1/2, 13 1/3, 20, and 25 | 1 and 3
240 | 2.5, 5, 7 1/2, 10, 15, 20, 25, and 50 | 1 and 3
480, 600 | 5, 10, 15, 20, 25, 35, 50, 60, and 100 | 1 and 3
2400 | 50, 100, 150, 200, 300, and 400 | 1 and 3
2770 | 50, 100, 150, 200, 300, 400, and 500 | 1 and 3
4160, 4800 | 50, 100, 150, 200, 300, 400, 500, 600, 700, and 800 | 1 and 3
6640, 7200, 7620, 7960, 8320, 9540, 9960, 11 400, 12 470, 13 280, 13 800, 14 400 | 50, 100, 150, 200, 300, 400, 500, 600, 700, and 800 | 1
15 125 | 50, 100, 150, 200, 300, 400, 500, 600, 700, and 800 | 1
19 920 | 100, 150, 200, 300, 400, 500, 600, 700, and 800 | 1
20 800, 21 600, 22 800, 23 800 24 940 | 100, 150, 200, 300, 400, 500, 600, 700, and 800 | 1
SOURCE: IEEE Std 18-2002, IEEE Standard for Shunt Power Capacitors, Table 1.