Battery Charger Used in Grid and Substation
In almost on all the 132 kV & 220 kV Sub-stations two sets of 110 V (for protection) and one set of 48 V (for carrier communication) lead Acid station batteries along with battery chargers are installed. The battery charging equipment comprises of a float charger and a boost charger. Stabilization output voltage is provided in the float charger to float the battery at the correct level. The battery can be boost charging after a prolonged mains failure by the boost charger. These chargers have been provided protection for under voltage DC & earth fault. DC Board is installed to feed various essential DC load from a separate feeder. Recommended specific gravity of cells at 27 0 C (electrolyte temp) should be 1.210 ± 0.005. Actual temp should be measured in the electrolyte of the cell. If the temp is different than 27 0 C the correction ± 0.0007/ 0 C change in temp. should be made in sp. gr. (Subtract for temp. below 27 0 C and add f...