WHY WE REDUCE TRANSFORMER COPPER LOSS:

  • Consider a load of 600 kW connected to a transformer of 1000 kVA. The typical full-load copper losses in a 1000 kVA transformer are 12000 W.

When compensation is provided on HT side, operating power factor of the transformer is 0.75 (same as uncompensated), denoted by cosØ1.

When compensation is provided on LT side, operating power factor of the transformer is 0.99 (compensated), denoted by cosØ2.

Power Saving = Wf * K *(1/cosØ1 - 1/cosØ2)


Where,

Wf = Full Load Copper Losses = 12000 W

K = Load in Kw/ KVA rating of transformer = 0.6

Power Saving (in W) = 12000*0.6*(1/.75-1/.99) = 2328 W

Monthly Energy Savings (in kWh) = 2328 *24*30/1000 = 1676.16 kWh

Typical Energy Charge (in Rs/kWh) = Rs. 7 per kWh

Monthly Cost Saving (in Rs) = 6*3380 = Rs. 11733.12/-

Yearly Cost Savings (in Rs) = 12*11733.12 = Rs. 140797.44/-

Thus, LT compensation provides monthly savings of Rs. 11733.12/- for a 1000 KVA transformer.

Additionally, the operating temperature of the transformer is relatively less because of reduced copper losses. Hence, apart from monetary benefits, LT compensation also ensures longer life of the transformer.