Question

Draw the circuit of three-phase converters with Y-connected loads and with delta-connected loads. Also, derive the relations for the Star-connected loads.

Answer 1

A three-phase converter can have Y-connected or delta-connected loads; with Y-connected loads, the line voltage is root three times the phase voltage and the line current is equal to the phase current.

Step-by-step explanation:

Three-Phase Converter Circuits

A three-phase converter circuit can be connected in two configurations: Y (Star) or Delta. The circuit includes a three-phase voltage source with each phase connected to a load. In a Y-connected load, the loads are connected at a central point, forming a 'Y' shape, whereas in a delta-connected system, the loads are connected in a triangle.

Y-Connected Load Derivation

For Y-connected loads, the line voltage (VL) is related to the phase voltage (VP) by the relation VL = √3 * VP. Similarly, the relationships between line currents (IL) and phase currents (IP) for a balanced Y-connected system are IL = IP, as the line current is the same as the phase current for Y-connected loads.

To provide an understanding of voltage and current in a Y-connected system, we can examine the loop abcda. Starting at point a and traveling in the loop to b, c, d, and back to a, we add the voltage source and subtract potential drops across the resistors. Within this context, the voltage and phase relationships can be mathematically represented and analyzed.