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 270C (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 270C the correction ± 0.0007/0C change in temp. should be made in sp. gr. (Subtract for temp. below 270 C  and add for temp. above 270 C).

Voltage of each cell (float charger in 'ON' position) should be.2.16-2.2 volts.

Volt across 55 cell (110 V) should be maintained between 118.8-121 volts.

Volt across 24 cells (48 V) should be maintained between 51.8-52.8 volts.










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