Example 8.3 A 25 MVA, 11 kV generator with X4" = 20% is connected through a transforme bus that supplies three identical motors as shown in the following figure. Each has Xa" = 25% and X4' = 30% on a base of 5 MVA, 6.6 kV. The three-phase rat the step up transformer is 25 MVA 11/66 kV with a leakage reactance of 10% of the step down transformer is 25 MVA, 66/6.6 kV with a leakage reactance o The bus voltage of the motors is 6.6 kV when a three-phase fault occurs at the For the specified fault, calculate the subtransient current at the fault point. Give reactance of transmission line is 15% on a base 25 MVA, 66 kV. Choose a syst of 25 MVA and 11 kV at generator side and assume that the system is operatin load. MI T2 Xiine = 15% M2 25 MVA 25 MVA 11/66 kV 66/6.6 kV M3 X=10% X= 10% 5 MVA 6.6 kV X"= 25%; X' = 30%

Q: Ql-phase step down transformer 1250 KVA, 1 1000/2200 V, 50 Hz .The resistance /phase and leakage…

A:

Q: A transformer with a 10/1 turns ratio has a maximum flux density of 60,000 lines/in2, when the…

A: EMF E = 4.44×frequency×Flux in the core×per phase turns. But flux = flux density× area of the core.…

Q: Consider the three single-phase two-winding transformers shown in Figure. 3. The high-voltage…

A:

Q: A 12 MVA, 132/6.6 kV, transformer having a reactance of 0.15 pu is fed from an infinite bus. The…

A: We will replace the components given in the circuit with per unit reactance respectively. The…

Three-Phase Transformers

Three-segment transformers are a type of transformer used to transform voltages of electrical systems into three ranges. Two type transformers are shell-type transformer and core type transformer. In brief, it could be described because of the exquisite kinds of configurations.

Transformer

Ever since electricity has been created, people have started using it in its entirety. We see many types of Transformers in the neighborhoods. Some are smaller in size and some are very large. They are used according to their requirements. Many of us have seen the electrical transformer but they do not know what work they are engaged in.