The figure below shows the circuit diagram of a controlled rectifier supplied from a 230 V, 50 Hz, 1-phase voltage source and a 10:1 ideal transformer. Assume that all devices are ideal. The firing angles of the thyristors T₁ and T₂ are 90^o and 270^o, respectively.

The RMS value of the current through diode D₃ in amperes is ________