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Answer Posted / ahmed abdel fattah
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The open delta transformer connection can be made with only
two transformers instead of three (figure below). This
connection is often used when the amount of three phase
power needed is not excessive, such as a small business. It
should be noted that the output power of an open delta
connection is only 87% of the rated power of the two
transformers. For example, assume two transformers, each
having a capacity of 25 kVA, are connected in an open delta
connection. The total output power of this connection is
43.5 kVA (50 kVA x 0.87 = 43.5 kVA).
Figure : Open Delta Connection
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1. A 380 / 220 V r.m.s. 3-phase 4-wire circuit carries loads of 8 + j8.1 ohm; 4 + j4.1 ohm; and 2 +j2.1 ohmin the three phases respectively. The length of the circuit is 100 m, and the resistivity of the phase conductors is 0.0005 Ω/m. The neutral conductor is of the same size as the phase conductors. a) Select a reference angle 0for the first phase. Then write down the three phase voltages in both polar format and complex number format. b) Make appropriate assumptions, and take temperature effects on resistance is insignificant. Calculate the currents in the three phases. (Note: Determine conductor resistance, and apply Kirchhoff’s Voltage Law) Based on the result, suggest a main switch rating for the circuit. c) Show your preferred direction of neutral current in a diagram, and then determine its value. (Note: Apply superposition principle, and Kirchhoff’s Current Law) Use its magnitude to show that in this circuit, the unbalanced load may increase the voltage drop in some of the phases. (Note: Also observe the common volt drip in neutral) State your assumptions, if there are any. d) Suddenly the neutral wire of the circuit is broken. Estimate the new currents in the first phase, i.e. Phase L1. State your assumptions, if there are any.
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