# Circuit analysis delta star

### Star delta questions and answers pdf

Similarly, i1p, i2p, i3p, i12p, i23p, and i31p are the phase currents, and i1L, i2L, and i3L are the line currents. Two common balanced-load connections in three-phase ac circuits. In Fig. Suppose we have a Star connected load as shown in the figure An above, and it has to be converted into a Delta connection as shown in figure B. If the line voltage is V rms and the line current is A rms , calculate the current in each resistor, the voltage across the resistors, and the resistance of each resistor. It is very convenient to carry out the calculations in a per-phase star-connected line to neutral basis. For simplifying complex network, delta to star or star to delta transformation is often required. The following steps are given below to solve the 3 phase unbalanced delta connected loads. The phase voltages of a three-phase supply can be given as Equation 3. Table

This follows from the relationship that the per-phase real power and reactive power are one-third of the total real power and reactive power, respectively. Suppose we have a Star connected load as shown in the figure An above, and it has to be converted into a Delta connection as shown in figure B. Related terms:. Delta To Star Conversion The replacement of delta or mesh by equivalent star connection is known as delta — star transformation.

If the line voltage is V rms and the line current is A rmscalculate the current in each resistor, the voltage across the resistors, and the resistance of each resistor.

### Delta star transformation questions and answers

A similar procedure will be followed for solving the unbalanced Star connected load. What line voltage is needed so that the lamps burn normally at rated conditions? The three-phase load is connected to a V rms, line voltage and 50 Hz three-phase star-connected supply. The two connections are equivalent or identical to each other if the impedance is measured between any pair of lines. Similarly, i1p, i2p, i3p, i12p, i23p, and i31p are the phase currents, and i1L, i2L, and i3L are the line currents. Delta to Star Conversion Similarly, a Delta connection network is given as shown above, in figure B and it has to be transformed into a Star connection, as shown above, in the figure A. Voltage and current relationships in three-phase circuits. Now if we measure the resistance value between points A and B, we will get, Since the two systems are identical, resistance measured between terminals A and B in both systems must be equal. Calculate the phase and line currents.

In this section, the voltage and the current functions are examined while the three-phase loads are connected to the star-connected three-phase supplies, shown in Fig.

Refer to Fig. Verify the results analytically. That means, the value of impedance will be the same if it is measured between any pair of lines irrespective of whether the delta is connected between the lines or its equivalent star is connected between that lines. Step 4 — Calculate the total power by the equation shown below.

The following steps are given below to solve the 3 phase unbalanced delta connected loads. What line voltage is needed so that the lamps burn normally at rated conditions? Equation 3.

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