tailieunhanh - Electric Machinery Fundamentals Power & Energy_3

Tham khảo tài liệu 'electric machinery fundamentals power & energy_3', kỹ thuật - công nghệ, điện - điện tử phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | power rating of the two transformers implying that the apparent power rating of each transformer must be 231 kVA. The ratings for each transformer in the bank for each connection are given below Connection Primary Voltage Secondary Voltage Apparent Power Turns Ratio Y-Y kV kV 200 kVA 1 Y-A kV kV 200 kVA 1 A-Y kV kV 200 kVA 1 A-A kV kV 200 kVA 1 open-A kV kV 346 kVA 1 open-Y open-A kV kV 346 kVA 1 Note The open-Y open-A answer assumes that the Y is on the high-voltage side if the Y is on the low-voltage side the turns ratio would be 1 and the apparent power rating would be unchanged. 2-10. A 13 800 480 V three-phase Y-A-connected transformer bank consists of three identical 100-kVA 7967 480-V transformers. It 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 VSC 560 V ISC A PSC 3300 W a If this bank delivers a rated load at 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 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 lagging and 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 lagging and leading. Solution From the short-circuit information it is possible to determine the per-phase impedance of the transformer bank referred to the high-voltage side. The primary side of this transformer is Y-connected so the short-circuit phase voltage is V SC Vvc Í60X V the short-circuit phase current is Iệ SC Isc A and the

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