Question

please solve the question in pu sysyem !!!!

Solvein pu sysvem 2-10. A 13,800/480 V three-phase Y-A-connected transformer bank consists of three identical 100-kVA 967/480-V transformers. I is supplied with power directly from a large constant-voltage bus. In the short-circuit test, the recorded values on the high-voltage side for one of these transformers are Isc 12.6 A Pc3300 w (a) If this bank delivers a rated load at 0.85 PF lagging and rated voltage, what is the line-to-line voltage on the primary of the transformer bank? (b) What is the voltage regulation under these conditions? (c) Assume that the primary voltage of this transformer bank is a constant 13.8 kV, and plot the secondary voltage as a function of load current for currents from no-load to full-load. Repeat this process for power factors of 0.85 lagging. 1.0. and 0.85 leading. (d) Plot the voltage regulation of this transformer as a function of load current for currents from no-load to full-load. Repeat this process for power factors of 0.85 lagging. 1.0, and 0.85 leading. Solve in pu sysyem (per unit )

Answer 1

Solutian 3300 3xto0 KVA /2554 omponon SL tiD6 12. 2.3 X 1 2-6

s) Raed Cu○ovonta- a) o.gspf, torp 350 IsvA 그taled 2. X 13.8 kV 1-31, 7z" 12.6 L 2.li L-L 느 14214.gliso

O.o iven priners lne. vol 0 3/.79

afiorn V. Xlo0 1c16 所) 79 67 一0-136

2-0H/ 4t unity p. P1 -o7.1