China manufacturer of magnetic ballasts for metal halide flood lights & hps flood lights

The fluorescent ballasts Load too much, the current large wire fever, the construction unit should according to Dengpan ballasts nominal current multiplied by 1.6 times Shun starting current design. Some experience in the construction units to design simple surface power, but only about 0.5 and each fluorescent ballast ignore the power factor of the inductor bracket about 8W loss. (Power factor compensation is not energy-efficient, only to improve the quality of power supply, power meter records only the active power, reactive power is not recorded, the power factor compensation compensation and concentration of the single lamp (stand-alone) to compensate for the two methods. Single lights compensation is every fixture in parallel with a capacitor, concentrated compensation is generally set up an automatic compensation screen in the distribution room, according to the inductive load into how much of the power grid operation can be automatically put into the the electrical capacity COSφ maintain a power factor close to 1). Such as: 40W × 3 Dengpan 10 sets.
Single count from the surface: current = 40W × 3 × 10 ÷ 220V = 5 .45 A,
And in fact should be: its current = (40W +8 W) × 3 × 10 ÷ 220V ÷ 0.5 = 13.09A
Coupled with instantaneous starting current = 13.09A × 1.6 times = 20.9A
The solution: increase the ballast power factor compensation capacitor (COSφ-refers)
COSφ = 40W +4.0 uF = 0.9 COSφ = 40W +4.5 uF = 0.95
COSφ = 30W +3.5 uF = 0.88 COSφ = 30W +4.0 uF = 0.90
COSφ = 20W +2.5 uF = 0.75 COSφ = 20W +4.0 uF = 0.90
After signing a 12uF compensation capacitor current = (40W +8 W) × 3 × 10 ÷ 220V ÷ 0.9 = 7.27A
Coupled with instantaneous starting current = 7.27A × 1.6 times = 11.63A
Ie: no compensation capacitor circuit withstand current capability 20.9A above design compensation capacitor 11.63A above design.