Exercise 1: Calculate transformer values. Np Ns Ep Es Rs Pp Ps Type 2 1 50V 25V 5?? 125mW 125mW Step-Down 3 1 5 3?? 1 1.5 20 10?? 3 25 100 50?? 5 15 75 5?? 1 15 14.8 3?? 6 5 18 7.5?? 3 7 10 8?? 1 21 14 2?? 3 12 36 3?? 51 17 24 4??
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Step 1: The transformer is a device that transfers electrical energy from one circuit to another through inductively coupled conductors. Show more…
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Given a 31.5 MVA single-phase step-down transformer: 110 KV:11 KV. 1. Find a, where a = N1/N2. 2. Find the input current I1. 3. Find the output current I2. 4. Is the actual input current greater, equal, or lesser than the rated value? Why? (Look at the circuit diagram). The open circuit test values are: Input voltage = 11 KV, P = 22.1 KW, I = 5.85 A. 5. Is the OC test run on the primary or the secondary side? 6. Find Rc. 7. Find Xm. The short circuit test values are: Input voltage = 5.755 KV, P = 163.935 KW, I = 286.36A. 8. Find Req (Req = r1 + r2'). 9. Find r1 and r2' assuming they are equal. 10. Find Xea (Xeq = x1 + x2'). 11. Find x1 and x2'. 12. Is the SC test run on the primary or secondary side? If the transformer is run at full load output with a power factor of 0.8 lagging: 13. Find I2 and V2 (bold denotes phasor values). 14. Find the full load power P. 15. Find the voltage drop across the transformer. 16. Find the % Regulation of the transformer. 17. Find the efficiency of the transformer. If the transformer is run at full load output with a power factor of 0.85 leading: 18. Find I2 and V2 (bold denotes phasor values). 19. Find the full load power P. 20. Draw the equivalent transformer circuit with all resistors and inductors on the primary side. 21. Label the transformer drawing with the resistance and inductance values.
Sri K.
P1 = 16W R1 = 25 R2 = 100 R3 = 150 R4 = 150 R5 = 200 R6 = 400 R7 = 200 R8 = 100 What is Et? 3.2 V 320 V 20 V 230 V
Supreeta N.
Secondary Voltage and Current in a Transformer Ranking Task Six transformers have the rms primary voltages (Vp), number of primary turns (Np), and number of secondary turns (Ns) listed below. Part A Which of the transformers are step-up transformers? Which of the transformers are step-down transformers? Place the appropriate transformers into the two categories listed below.
Adi S.
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