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The core loss in a 250 kVA, 3-phase transformer is estimated to be 0.004 pu. The...
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...
Q1 A single-phase 11/2.2 kV, 22 kVA transformer has the following parameters all referred to the HV side RI 0.4, X 0...
Q1 A single-phase 11/2.2 kV, 22 kVA transformer has the following parameters all referred to the HV side RI 0.4, X 0.602, R2 7.5 , X2 22 , Re 2500 , and Xm - 20002 The transformer is supplying 80% of its rated load at a power factor of 0.87 power factor lagging and at its rated voltage. Calculate (a) the efficiency of the transformer, (b) the power losses on the primary side (the copper loss and core loss), and...
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 2: A 10 KVA 2200/220 V, 50 Hz transformer core and full load copper losses...
Problem 2: A 10 KVA 2200/220 V, 50 Hz transformer core and full load copper losses are given as PCore = 153 W, PCu = 224 W. a) Find the maximum efficiency b) Determine the all-day efficiency under following load pattern: 1. 2 hrs at 5/4 load 2. 6 hrs at full load 3. 8 hrs at 2 load 4. 4 hrs at 4 load 5. 4 hrs at no load
A three phase 250 kVA 2400:415 V 50 Hz distribution transformer is constructed by connecting thre...
A three phase 250 kVA 2400:415 V 50 Hz distribution transformer is constructed by connecting three single phase transformers in the Dynll vector group as shown in Fig.P1. The per phase equivalent circuit parameters on the high voltage side are: R1-0.72 Ω, Xi,-0.92 Ω, R2-0.70 Ω, Xp-0.90 Ω, R.-308.49 Ω, and X,,-44.61 Ω (a) Sketch the corresponding phasor diagram of the primary and secondary voltages for the Dynll vector group; lagging; terminal voltage is 415 V line to line, and...
help me please please answer many as possible 10. The hysteresis loss in the core of a transformer can be reduced by A. increasing the frequency of the aliemating current, B. using a solid iro...
help me please
please answer many as possible
10. The hysteresis loss in the core of a transformer can be reduced by A. increasing the frequency of the aliemating current, B. using a solid iron core. C. using grain-oriented-steel D, reducing the connected load. 11. In Fig. 1(b) in the text, the phasor I, It is the resultant of the A. exciting and the magnetizing current. B. active and the reactive secondary current. C. primary and the exciting current. D....
what information needed? 3. Repeat Example 7.8, using a 100 kVA transformer and #3/0 AWG and...
what information needed?
3. Repeat Example 7.8, using a 100 kVA transformer and #3/0 AWG and #2 AWG cables for the SLs and SDs, respectively Show the procedure to arrive at the following answers (a) 0.72 pu A (b) 0.050 pu V Example 7.8 residential secondary distribution system. Assume that the distribution trans- Figure 7.11 shows former capacity is 75 kVA (use Table 7.1), all secondaries and services are single-phase three wire, nominally 120/240 V, and all SLs are of...
can you calculate this question and explain why? thanks 1. A 250-kVA, 11000/2200-V, 50-Hz, single-phase transformer...
can you calculate this question and explain why?
thanks
1. A 250-kVA, 11000/2200-V, 50-Hz, single-phase transformer has the following parameters: RI 1.3 , R2 0.05 , Rel 193 k2, X1 4.5 Q X2 0.16 2 I,- 80 kQ Xml (a) Draw the approximate equivalent circuit of the transformer showing all the circuit parameters referred to the low-voltage side. Use the approximate equivalent circuit to calculate the input voltage and voltage regulation of the transformer when it delivers full load at...
how to draw this question? A 100-KVA, delta-delta transformer (Xeqs 0.12 pu,680V/3 parallel Delta-Y-grounded load (Delta: 30j ohms, Y-g: Zy 20 ohms and 2n -5 ohms) through a transmission line of i...
how to draw this question?
A 100-KVA, delta-delta transformer (Xeqs 0.12 pu,680V/3 parallel Delta-Y-grounded load (Delta: 30j ohms, Y-g: Zy 20 ohms and 2n -5 ohms) through a transmission line of impedance 0.7Sel"sohms. The phase voltages of the source are as follows: 40 v) is connected to a Va 680 Vb 680e-115 v Vc 680e/140 y Assume transmission line impedance is 0.75e/75ohms and a symmetrical Y grounded load is connected to the end with Zy 20 ohms and Zn 5...
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...
Q1 A single-phase 11/2.2 kV, 22 kVA transformer has the following parameters all referred to the HV side RI 0.4, X 0.602, R2 7.5 , X2 22 , Re 2500 , and Xm - 20002 The transformer is supplying 80% of its rated load at a power factor of 0.87 power factor lagging and at its rated voltage. Calculate (a) the efficiency of the transformer, (b) the power losses on the primary side (the copper loss and core loss), and...
Problem 2: A 10 KVA 2200/220 V, 50 Hz transformer core and full load copper losses are given as PCore = 153 W, PCu = 224 W. a) Find the maximum efficiency b) Determine the all-day efficiency under following load pattern: 1. 2 hrs at 5/4 load 2. 6 hrs at full load 3. 8 hrs at 2 load 4. 4 hrs at 4 load 5. 4 hrs at no load
A three phase 250 kVA 2400:415 V 50 Hz distribution transformer is constructed by connecting three single phase transformers in the Dynll vector group as shown in Fig.P1. The per phase equivalent circuit parameters on the high voltage side are: R1-0.72 Ω, Xi,-0.92 Ω, R2-0.70 Ω, Xp-0.90 Ω, R.-308.49 Ω, and X,,-44.61 Ω (a) Sketch the corresponding phasor diagram of the primary and secondary voltages for the Dynll vector group; lagging; terminal voltage is 415 V line to line, and...
help me please
please answer many as possible
10. The hysteresis loss in the core of a transformer can be reduced by A. increasing the frequency of the aliemating current, B. using a solid iron core. C. using grain-oriented-steel D, reducing the connected load. 11. In Fig. 1(b) in the text, the phasor I, It is the resultant of the A. exciting and the magnetizing current. B. active and the reactive secondary current. C. primary and the exciting current. D....
what information needed?
3. Repeat Example 7.8, using a 100 kVA transformer and #3/0 AWG and #2 AWG cables for the SLs and SDs, respectively Show the procedure to arrive at the following answers (a) 0.72 pu A (b) 0.050 pu V Example 7.8 residential secondary distribution system. Assume that the distribution trans- Figure 7.11 shows former capacity is 75 kVA (use Table 7.1), all secondaries and services are single-phase three wire, nominally 120/240 V, and all SLs are of...
can you calculate this question and explain why?
thanks
1. A 250-kVA, 11000/2200-V, 50-Hz, single-phase transformer has the following parameters: RI 1.3 , R2 0.05 , Rel 193 k2, X1 4.5 Q X2 0.16 2 I,- 80 kQ Xml (a) Draw the approximate equivalent circuit of the transformer showing all the circuit parameters referred to the low-voltage side. Use the approximate equivalent circuit to calculate the input voltage and voltage regulation of the transformer when it delivers full load at...
how to draw this question?
A 100-KVA, delta-delta transformer (Xeqs 0.12 pu,680V/3 parallel Delta-Y-grounded load (Delta: 30j ohms, Y-g: Zy 20 ohms and 2n -5 ohms) through a transmission line of impedance 0.7Sel"sohms. The phase voltages of the source are as follows: 40 v) is connected to a Va 680 Vb 680e-115 v Vc 680e/140 y Assume transmission line impedance is 0.75e/75ohms and a symmetrical Y grounded load is connected to the end with Zy 20 ohms and Zn 5...
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