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4.4 Voltage regulating transformer. Consider the following circuit in which the generator real and reactive power...
A tap changing transformer at the end of a feeder as shown in Fig.Q4 supplies a...
A tap changing transformer at the end of a feeder as shown in Fig.Q4 supplies a load of (0.5 + j0.2) pu. The combined impedance of the feeder and the transformer is 0.05+j0.6) pu. The source end is maintained at 1.0 pu voltage. A reactive power compensator is available at the load busbar. The voltage at the load bus is to be maintained above 0.9 pu. The off nominal tap ratio t of the transformer is set to 1.195. The...
Voltage regulating transformers (load voltage control). This question 4.3 explores the use ofregulating transformers to control...
Voltage regulating transformers (load voltage control). This question 4.3 explores the use ofregulating transformers to control voltages at bulk supply load- buses An important application of voltage regulating transformers is to control the voltage on the low-voltage (LV) side of transformers in bulk supply substations. Such sub- stations receive power from the transmission system (e.g. at voltages at 275 kV and higher) and transform it to sub-transmission / distribution system voltages (e.g. 66 kV or 33 kV) for distribution to...
Problem 1: A three-phase transformer has the following name plate data: Rated Power Primary voltage Secondary...
Problem 1: A three-phase transformer has the following name plate data: Rated Power Primary voltage Secondary Voltage Excitation reactance Series Impedance 150 MVA 230 kV 32 kV 30 (pu) 0.02+0.15j (pu) The transformer is Y/A connected. Answer the following questions: a) What are the nominal (rated) primary and secondary line currents?| b) What is the nominal value of the Delta-side winding (internal) current? c) What is the secondary to primary winding turn ratio? d) The transformer is supplying 150 MVA...
Consider the 4-bus power system shown in Fig. 1. The system parameters are given below: 50 MVA, 2...
Please show all the clearly step
Y11 ist j30 and Y44 isnt -j12.85
Consider the 4-bus power system shown in Fig. 1. The system parameters are given below: 50 MVA, 20 kV, X-2090 40 MVA, 20 kV, X-20%, X, = 5% 50 MVA, 20 kV Δ /110 kV Ý, X= 1090 50 MVA, 20 kV MI 10 kV Ý, X= 10% Xi-24.2 Ω Generator G: Motor M: Transformer T1 : Transformer T2 : Transmission line: 3 4 T2 nu)M Fig....
A single line diagram of a power system is shown in Fig. 2. The system data with equipment ratings and assumed sequence reactances are given the following table. The neutrals of the generator and A-Y...
A single line diagram of a power system is shown in Fig. 2. The system data with equipment ratings and assumed sequence reactances are given the following table. The neutrals of the generator and A-Y transformers are solidly grounded. The motor neutral is grounded through a reactance Xn 0.05 per unit on the motor base. Assume that Pre-fault voltage is takin as VF-1.0 ,0° per unit and Pre- fault load current and Δ-Y transformer phase shift are neglected In the...
A 450 MVA, 26-kV generator is connected to a 345-kV power system through a 500MVA, 26-kV:345-kV t...
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...
5 in the 3-bus power system, what reactive power compensation needs to be provided at bus-3...
5 in the 3-bus power system, what reactive power compensation
needs to be provided at bus-3 to bring its voltage to 1
pu.
To illustrate power flow calculations, an extremely simple power system consisting of three buses is shown in Figure 5.1. These three buses are connected through three 345-kV transmission lines 200 km, 150 km, and 150 km long, as shown in Figure 5.1. Similar to the values listed in Table 4-1 of Chapter 4, assume that these transmission...
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...
03 Consider the following one line diagram. The generator is rated at 25 MVA, IN has...
03 Consider the following one line diagram. The generator is rated at 25 MVA, IN has subtransient reactance of 20 %. The transmission line has a reactance of 10 The subtransient reactance of motorlis 0.345 pu where is that ol second more pu. Each motor has the following ratings. 10 MVA and 11 kV. Both transformers are rated at 25 MVA and have a reactance of 8.05% each; the transformers 1 and 2 have voltage ratio of 11/121 KV and...
Problem #1 Part I (50 points) Consider the following one-line diagram of a three-phase power system. Assume that the system has the following base quantities: S3 100 MVA, and VbaselL 38 kV at the...
Problem #1 Part I (50 points) Consider the following one-line diagram of a three-phase power system. Assume that the system has the following base quantities: S3 100 MVA, and VbaselL 38 kV at the generator side. The rated line-to-line terminal voltage of the generator (BUS 1) is 38 kV. A single-circuit three-phase transposed overhead line composed by one ACSR Partridge conductor per phase with vertical configuration. The transmission line length is 50 km and the distance between phases a-b, b-c...
A tap changing transformer at the end of a feeder as shown in Fig.Q4 supplies a load of (0.5 + j0.2) pu. The combined impedance of the feeder and the transformer is 0.05+j0.6) pu. The source end is maintained at 1.0 pu voltage. A reactive power compensator is available at the load busbar. The voltage at the load bus is to be maintained above 0.9 pu. The off nominal tap ratio t of the transformer is set to 1.195. The...
Voltage regulating transformers (load voltage control). This question 4.3 explores the use ofregulating transformers to control voltages at bulk supply load- buses An important application of voltage regulating transformers is to control the voltage on the low-voltage (LV) side of transformers in bulk supply substations. Such sub- stations receive power from the transmission system (e.g. at voltages at 275 kV and higher) and transform it to sub-transmission / distribution system voltages (e.g. 66 kV or 33 kV) for distribution to...
Problem 1: A three-phase transformer has the following name plate data: Rated Power Primary voltage Secondary Voltage Excitation reactance Series Impedance 150 MVA 230 kV 32 kV 30 (pu) 0.02+0.15j (pu) The transformer is Y/A connected. Answer the following questions: a) What are the nominal (rated) primary and secondary line currents?| b) What is the nominal value of the Delta-side winding (internal) current? c) What is the secondary to primary winding turn ratio? d) The transformer is supplying 150 MVA...
Please show all the clearly step
Y11 ist j30 and Y44 isnt -j12.85
Consider the 4-bus power system shown in Fig. 1. The system parameters are given below: 50 MVA, 20 kV, X-2090 40 MVA, 20 kV, X-20%, X, = 5% 50 MVA, 20 kV Δ /110 kV Ý, X= 1090 50 MVA, 20 kV MI 10 kV Ý, X= 10% Xi-24.2 Ω Generator G: Motor M: Transformer T1 : Transformer T2 : Transmission line: 3 4 T2 nu)M Fig....
A single line diagram of a power system is shown in Fig. 2. The system data with equipment ratings and assumed sequence reactances are given the following table. The neutrals of the generator and A-Y transformers are solidly grounded. The motor neutral is grounded through a reactance Xn 0.05 per unit on the motor base. Assume that Pre-fault voltage is takin as VF-1.0 ,0° per unit and Pre- fault load current and Δ-Y transformer phase shift are neglected In the...
5 in the 3-bus power system, what reactive power compensation
needs to be provided at bus-3 to bring its voltage to 1
pu.
To illustrate power flow calculations, an extremely simple power system consisting of three buses is shown in Figure 5.1. These three buses are connected through three 345-kV transmission lines 200 km, 150 km, and 150 km long, as shown in Figure 5.1. Similar to the values listed in Table 4-1 of Chapter 4, assume that these transmission...
03 Consider the following one line diagram. The generator is rated at 25 MVA, IN has subtransient reactance of 20 %. The transmission line has a reactance of 10 The subtransient reactance of motorlis 0.345 pu where is that ol second more pu. Each motor has the following ratings. 10 MVA and 11 kV. Both transformers are rated at 25 MVA and have a reactance of 8.05% each; the transformers 1 and 2 have voltage ratio of 11/121 KV and...
Problem #1 Part I (50 points) Consider the following one-line diagram of a three-phase power system. Assume that the system has the following base quantities: S3 100 MVA, and VbaselL 38 kV at the generator side. The rated line-to-line terminal voltage of the generator (BUS 1) is 38 kV. A single-circuit three-phase transposed overhead line composed by one ACSR Partridge conductor per phase with vertical configuration. The transmission line length is 50 km and the distance between phases a-b, b-c...
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