why capacitor bank always connected in delta,why not in
star to a system?

Answer Posted / debasish

Capacitor is used to balance the line inductance and hence
to increase the power factor. The effective capacitive
reactance is 3 times more when connected in parallel than in
series. So, to improve the p.f. by a fixed amount, the
capacitance required in parallel is 1/3 of capacitance
required in series. So, the cost is less for parallel
connection.

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