From the lagging and upf load secondary terminal voltage will dip from induced voltage, where in leading load terminal voltage will rise from induced voltage.
As we can observe in the plotted graphs.
QUESTION 3 A 200 - MVA, 15/200 kV single-phase power transformer has a per – unit...
A 5 MVA 230/13.8 kV, single-phase transformer has a per-unit resistance of 1% and a per-unit reactance of 5%. The open-circuit test performed on the low voltage side of the transfromer yielded the following data: VOC=13.8 kV, IOC=21.1 A, and POC=90.8 kW. (a) Find the equivalent circuit referred to the high voltage side of this transformer. (b) If the transformer is operating at full-load and at 0.8 pf lagging, find the voltage regulation of the transformer at this operating condition.
A 400-MVA, 200-kV/20-kV, three phase Y-Y transformer has an equivalent series impedance of ZTL = 0.012 + 20.0162 per phase referred to the low-voltage side (secondary side). The transformer is supplying a three-phase load of 300-MVA, 0.8 power factor lagging at terminal voltage of 20 kV (line-to-line) on its low-voltage side (secondary side) as shown in Fig. 22. The primary is supplied from a transmission line with an impedance of ZL = 0.5 + j1.0 per phase. The line-to-neutral load...
4. [Transformer - 15 points) A 50-kVA, 13,800/208-V, A-Y distribution transformer has an equivalent resistance of 3 percent and a reactance of 9 percent per unit. (a) What is the transformer's phase impedance referred to the high-voltage side? (b) Calculate this transformer's voltage regulation at full load and 0.9 PF leading.
A three-phase Y-A transformer is rated 225-kV:24-kV, 400 MVA and has a single-phase equivalent series reactance of 6.08 ? as referred to its high-voltage terminals. The transformer is supplying a load of 375 MVA at 0.89 power factor leading at a voltage of 24 kV (line to line) on its low-voltage side. It is supplied from a feeder whose impedance is 0.17 +/2.2 ? connected to its high-voltage terminals. For these conditions, calculate (a) the line-to-line voltage at the high-...
A 50-kVA, 13,800/208-V, Delta to Wye connected distribution transformer has an equivalent resistance of 3 percent and a reactance of 9 percent per unit. (a) what's the transformers phase impedance referred to the high side voltage? (b) what's the transformers voltage regulation at full load and 0.9 PF leading? equivalent resistance of 3 percent and a reactance of 9 percent per unit. (a) What is the transformer's phase impedance referred to the high-voltage side? (b) Calculate this transformer's voltage regulation...
Given a 31.5 MVA Single phase step down transformer.110 KV:11 KV The open circuit test values are Input voltage = 11 KV, P = 22.1 KW, I=5.85 A The short circuit test values are.Input voltage = 5.755 KV, P=163.935 KW, I= 286.36A If the transformer is run 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...
A 150 MVA, 22/220 KV transformer has p.u. resistance of 1.2% and reactance of3.5%.The magnetizing impedance is 136.6+ 185j p.u. The transformer supplies the rated current at 0.92 PF. Find the Equivalent circuit referred to the secondary. Find the Voltage regulation Find the copper losses and the core closes of the transformer. Find the efficiency of the transformer.
Transformer TI : 50 MVA, 10 kV Y/138 kV Y, X=0.10 per unit; Transformer T2: 100 MVA, 15 kV D/138 kV Y, X-0.10 per unit; Each 138-kV line: X1-400 A three-phase short circuit occurs at bus 5, where the prefault voltage is 15 kV. Prefault load current is neglected. (a)Draw the positive-sequence reactance diagram in per-unit on a 100-MVA, 15-kV base in the zone of generator G2. Determine: (b) the The'venin equivalent at the fault, (c) the subtransient fault current...
three-phase transformer is rated at 12 kV/135 kV, 100 MVA. It has the following equivalent circuit parameters (referred to the primary winding where appropriate) : • primary resistance R1 = 0.03 ohms, secondary resistance R2’ = 0.04 ohms • primary leakage reactance X1 = 0.1 ohms, secondary leakage reactance X2’ = 0.1 ohms • magnetising reactance XM = 16 ohms, core-loss resistance RC = 200 ohms. In your calculations, you should use the simplified equivalent circuit. i) The transformer is...
A 450 MVA, 26-kV generator is connected to a 345-kV power system through a 500MVA, 26-kV:345-kV transformer which can be represented by a series reactance of 95 m Ω when referred to its low-voltage terminals. The generator has a saturated synchronous reactance of 1.73 per unit and a rated-open- circuit-voltage field current of 2140 A. Under normal operating procedures, the generator is operated under automatic voltage regulation set to maintain its terminal voltage at 26 kV. In this problem you...