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3. A GE 3-phase power transformer is tested at 10,000KVA at is voltage rating of 34.4KV/13.2KV,...
A 1200 kVA, 11/3.3 kV, 50-Hz, three phase Dyn 11 transformer is subjected to both the...
A 1200 kVA, 11/3.3 kV, 50-Hz, three phase Dyn 11 transformer is subjected to both the open, and short circuit tests, yielding the following results: OPEN CIRCUIT TEST SHORT CIRCUIT TEST Vsupply = 3.3 kV Vsupply = 650 V Io = 7.3 A Isc = 54.4A Po = 6.71 kW Psc = 8.89 kW Determine: 1.1 The no load current per phase, in RECTANGULAR form, referred to the H.V. side. (5) 1.2 How would you know, without being told, that...
A three-phase Yy0 connected transformer has a nominal rating of 250 kVA and a voltage ratio...
A three-phase Yy0 connected transformer has a nominal rating of 250 kVA and a voltage ratio 15:0.4 kV. After conducting the short-circuit test, where the secondary winding is short-circuited, it is found that the primary series resistance is 0.08 pu and the primary series impedance magnitude is 0.1pu. The effect of the parallel branch in the transformer’s equivalent circuit may be neglected. Explain what information ‘Yy0’ gives about the transformer. Draw the per-phase equivalent circuit of the transformer during the...
Problem 1: A single-phase load with a nameplate rating of 4.16kV, 2.5MW, 0.8 pf (lag) is...
Problem 1: A single-phase load with a nameplate rating of 4.16kV, 2.5MW, 0.8 pf (lag) is being supplied from a 4.16kV singe-phase generator. There is a 5km transmission line between the generator and the load. The transmission line has an impedance of 0.5 / 60◦ ohms per 1000m. What is the ratio of the voltage at the load to the voltage at the generator terminals? What is the power loss in the transmission line? What is the actual load power?...
1. A three-phase synchronous generator connected to a 345-KV transmission line through a transformer as shown...
1. A three-phase synchronous generator connected to a 345-KV transmission line through a transformer as shown in Figure P1. Parameters of both generator and transformer are given in the figure. Transformer losses and exciting current are neglected. A three-phase short-circuit occurs on the line side of the circuit breaker when the generator is operated at rated terminal voltage and at no-load. The breaker interrupts the fault three cycles after fault inception. Neglect the effect of the transformer on the time...
[29] SECTION B: TRANSFORMERS QUESTION 2 2.1 A 240:48-volt, 50-F power factor of 0.8 lagging. If...
[29] SECTION B: TRANSFORMERS QUESTION 2 2.1 A 240:48-volt, 50-F power factor of 0.8 lagging. If the no load current and iron loss of this e transformer supplies a load of 10 ampere at a ampere and 12-watt respectively, calculate the total current supplied and the powe oad current and iron loss of this transformer are factor. (7) KVA, 50-Hz, 1200:230-volt single phase transformer has the following series impedance values: Z1 = (0.047 +0.112) Z2 = (0.00172 +0.00411)2 Calculate: 2.2.1...
Question I The rating of a three phase three winding transformer are: Y-connected 10 KV 40 MVA Secondary Y-connecte...
Question I The rating of a three phase three winding transformer are: Y-connected 10 KV 40 MVA Secondary Y-connected 22 KV 40 MVA A-connected 4 KV 15 MVA Primary Tertiary Neglecting winding resistance and exciting current, the per unit leakage reactance are: Mps 9.6 % pu on 40 MVA, 11022 KV xm = 7.2 % pu on 40 MVA, I 10/ 4 KV Xsti: 12 % pu on 40 MVA, 22/ 4 KV Determine the era nyimpedances of the transformer...
SOLVE: In a factory there is a three-phase transformer with the following characteristics: -S = 100...
SOLVE: In a factory there is a three-phase transformer with the following characteristics: -S = 100 kVA, 22 / 12.7 kV - D-Y - Resistance of 0.15 pu and a reactance of 0.6 pu. -Ram of excitation Rm = 100 pu and Xm = 20 pu. a) If this transformer supplies an 80 kVA load with an FP = 0.8 lag, draw the phasor diagram of one phase of the transformer. b) What is the regulation of the transformer bank...
A three phase power transformer of 100 (KVA), 22 / 12.7 (kV) and Δ-Y has a...
A three phase power transformer of 100 (KVA), 22 / 12.7 (kV) and Δ-Y has a resistance of 0.15 (pu) and a reactance of 0.6 (pu). The elements of the excitation branch are R_m = 100 (pu) and X_m = 20 (pu) a) If this transformer supplies a load of 80 (KVA) with an FP = 0.8 delay, draw the phasor diagram of one phase of the transformer. b) What is the voltage regulation of the transformer bank in these...
A large power plant generates electricity at 12.0 kV. Its old transformer once converted the voltage...
A large power plant generates electricity at 12.0 kV. Its old transformer once converted the voltage to 330 kV. The secondary of this transformer is being replaced so that its output can be 775 kV for more efficient cross-country transmission on upgraded transmission lines. If the power output is 1,000 MW and line resistance is 1.20 Ω, what are the old and new line power losses (in MW)? old line losses. new line losses physics
A large power plant generates electricity at 12.0 kV. Its old transformer once converted the voltage...
A large power plant generates electricity at 12.0 kV. Its old transformer once converted the voltage to 350 KV. The secondary of this transformer is being replaced so that its output can be 765 kV for more efficient cross-country transmission on upgraded transmission lines. If the power output is 1,000 MW and line resistance is 2.750, what are the old and new line power losses (in MW)? old line losses new line losses MW MW
1. A three-phase synchronous generator connected to a 345-KV transmission line through a transformer as shown in Figure P1. Parameters of both generator and transformer are given in the figure. Transformer losses and exciting current are neglected. A three-phase short-circuit occurs on the line side of the circuit breaker when the generator is operated at rated terminal voltage and at no-load. The breaker interrupts the fault three cycles after fault inception. Neglect the effect of the transformer on the time...
[29] SECTION B: TRANSFORMERS QUESTION 2 2.1 A 240:48-volt, 50-F power factor of 0.8 lagging. If the no load current and iron loss of this e transformer supplies a load of 10 ampere at a ampere and 12-watt respectively, calculate the total current supplied and the powe oad current and iron loss of this transformer are factor. (7) KVA, 50-Hz, 1200:230-volt single phase transformer has the following series impedance values: Z1 = (0.047 +0.112) Z2 = (0.00172 +0.00411)2 Calculate: 2.2.1...
Question I The rating of a three phase three winding transformer are: Y-connected 10 KV 40 MVA Secondary Y-connected 22 KV 40 MVA A-connected 4 KV 15 MVA Primary Tertiary Neglecting winding resistance and exciting current, the per unit leakage reactance are: Mps 9.6 % pu on 40 MVA, 11022 KV xm = 7.2 % pu on 40 MVA, I 10/ 4 KV Xsti: 12 % pu on 40 MVA, 22/ 4 KV Determine the era nyimpedances of the transformer...
A large power plant generates electricity at 12.0 kV. Its old transformer once converted the voltage to 350 KV. The secondary of this transformer is being replaced so that its output can be 765 kV for more efficient cross-country transmission on upgraded transmission lines. If the power output is 1,000 MW and line resistance is 2.750, what are the old and new line power losses (in MW)? old line losses new line losses MW MW
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