Characteristics of DELTA-DELTA connection

• In delta-delta connection, dissimilar ends join together.
• The system is three phase, 3 wire system.
• In delta-delta connection line current is given by I_L = I_P√3.
• In star-star connection line voltage and phase voltage are equal  V_L = V_P.
• Line currents are 120 degree apart.
• Line currents are 120 degree ahead w.r.t phase current.
• Zero sequence current and circulating current can not be avoided.
• As phase voltage is greater so large number of turns are required and hence more insulation is required.
• Due to low currents winding must have small cross sectional area.
• This connection is suitable for low voltage transformers.