The missing values.
Explanation of Solution
The given values are shown in below table:
Primary (P) | Secondary (S) | Load (L) | |||
7200 | 240 | ||||
Ratio |
Refer to the circuit shown in Figure 8-30.
The primary windings of three single phase transformer are connected in wye connection. In wye connection, the line voltage is equal to
The secondary windings of three single phase transformer are connected in delta connection. In delta connection, the line voltage is equal to phase voltage.
Calculate the turns ratio of primary and secondary winding.
Thus, the turns ratio
Since, the secondary winding (S) is directly connected to the load (L). Thus, the line voltage of secondary winding and load are equal.
Here, the load uses wye connection. In wye connection, the line voltage is equal to
Calculate the phase current of the load
In wye connection, the phase current
Since, the secondary winding (S) is directly connected to the load (L). Thus, the line current of secondary winding and load are equal.
Here, the secondary winding uses delta connection. In delta connection, the line current is equal to
Calculate the phase current in primary winding
Since, the primary winding uses wye connection. In wye connection, the line current is equal to phase current.
Thus, the all missing values are calculated and shown in below table:
Primary (P) | Secondary (S) | Load (L) | |||
4156.92 | 440 | 138.56 | |||
1.15 | 20 | 34.64 | |||
7200 | 240 | 240 | |||
1.15 | 34.64 | 34.64 | |||
Ratio | 17.32:1 |
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Chapter 8 Solutions
Electrical Transformers and Rotating Machines
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