PLEASE SOLVE THIS POWER / LOAD FLOW
![07-Elec-B December 2016 Page 7 of 7 Problem 7 Consider the system shown in the single-line diagram of Figure (5). Here, a 60-Hz synchronous generator having a transient reactance of 0.15 pu. is connected to an infinite bus through a transformer whose reactance is 0.1 p. u. and a double circuit transmission line with circuits having a reactance of 0.6 p.u each as indicated in the figurc. The generator delivers a real power of 0.9 pu. to bus 1. The magnitudc of the voltage at bus 1 is 1.05 pu. The infinite bus voltage is 1.0 pu with an angle zero a- Determine the excitation voltage of the generator under these conditions. [10 points] b- A three phase fault occurs at the middle of one transmission circuit as shown. Assume that the generator excitation voltage remains constant at E,= 1.14 pu. Let the parameter (a) be 0.25 (ie, the fault is close to bus1. ll the system remain stable under sustained fault conditions? [10 points] j0. Line 1 j0.15 j 0.1 . Line 2 j0.6 a j0.6 (1-a) Figure (5) Circuit for Problem 7](http://img.homeworklib.com/questions/00771990-0569-11ec-ab8e-bbe251e8685e.png?x-oss-process=image/resize,w_560)
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PLEASE SOLVE THIS POWER / LOAD FLOW
07-Elec-B December 2016 Page 7 of 7 Problem 7...
A remote generator transmits energy to a major load/generation via a system shown in the drawing....
A remote generator transmits energy to a major load/generation via a system shown in the drawing. Assume the generators voltage behind transient reactance to be 1.1pu, the infinite bus voltage to be 1.0 pu and the power transfer to be 0.3 pu during the steady state condition of the network. The line reactance is j0. 5 pu per line and the transient reactance of the generator isj0. 2 pu. The normalised constant of the generator H- 3KWS7KVA A 3 phase...
thanks for the help Course ID: 103891. ELEC ENG 706, June 2017 Page 16 of 21...
thanks for the help
Course ID: 103891. ELEC ENG 706, June 2017 Page 16 of 21 Question 5. [ 20 marks ] 5a) Power Systems analysis [ 7 marks The single-line diagram below represents a generator driving a load over a long transmission line with a synchronous compensator connected to the receiving end. The transmission line can be modelled as shown with an inductive reactance X - 0,4 pu and two capacitive reactances Xc-3 pu on a base of 1000...
Problem 2. A 3-phase star-connected turbo-generator feeds power to 11 kV infinite bus, through two parallel...
Problem 2. A 3-phase star-connected turbo-generator feeds power to 11 kV infinite bus, through two parallel transmission lines each having a reactance of452. The generator synchronous reactance is 3 Ω. (a) The mechanical input to alternator and its excitation are adjusted as that the operating power factor at alternator terminals is unity and rated current of 500 A is delivered. Calculate the alternator terminal and excitation voltages. Also determine the active and reactive powers delivered to the infinite bus. (b)...
Question 2 A 60 Hz synchronous generator with Xd 0.2 pu transient reactance is connected to...
Question 2 A 60 Hz synchronous generator with Xd 0.2 pu transient reactance is connected to an infinite us through a transformer and the transmisiones as shown in the Figure. All system reactances are marked on the diagram and are expressed on a common MVA base. The generator dies a power of Auto busbar 1. The magnitude of the generator's excitation voltage e'is 12 pu, and the infinite bus voltage is -1.00u. If a 3-phase fault occurs at the middle...
The generator has an internal voltage of 1.5 pu and an inertia constant (H) of 3 MJ/MVA. Determine whether the generator is transiently stable or not if the fault clearing time is 0.15 seconds.
A generator, with a transient reactance of j0.5 pu, delivers 1.0 pu real power to an infinite bus through a transformer and two transmission lines in parallel as shown below. A solid three phase fault occurs at position near “F” which is cleared by opening both ends of the transmission leaving only one line in service.
The generator has an internal voltage of 1.5 pu and an inertia constant (H) of 3 MJ/MVA. Determine whether the generator is transiently stable...
Consider the circuit as shown. Assume that E = 1.25 p.u. and V = 1.00 p.u. (You can assume that the transient reactance of the generator is j 0.03 pu.)
Consider the circuit as shown. Assume that E=1.25 p.u. and V=1.00 p.u. (You can assume that the transient reactance of the generator is j 0.03 pu.)
a) Find the initial power angle \(\delta\) when the active component of the load on the circuit is 2.8 p.u. [5 marks]
b) A three-phase short circuit takes place in the middle of transmission line 3 . Determine whether the system will remain stable or not when the fault is sustained (i.e., a permanent...
A 50 Hz, 250 MVA synchronous generator having inertia constant H=5 MJ/MVA is connected to an infinite bus through trans...
A 50 Hz, 250 MVA synchronous generator having inertia constant H=5 MJ/MVA is connected to an infinite bus through transformer and transmission line as shown below. The transformer reactance is based on 500 MVA, while the other impedances are based on the generator MVA Infinite bus 1 2 3 XL 0.1 pu - oto G1 V= 1.0 pu X 0.1 pu Xd = 0.3 pu at 500 MVA The generator is delivering 0.8 of full load current at a power...
b) A fault occurs at bus 4 of the network shown in Figure Q3. Pre-fault nodal...
b) A fault occurs at bus 4 of the network shown in Figure Q3. Pre-fault nodal voltages throughout the network are of 1 +j0 p.u. and the impedance of the electric arc is neglected (Zf-0+)0p.u). The positive, negative and zero sequence impedance parameters of the generator, transmission lines and transformer are given in Figure Q3 x,(1) 30. 15 p.u. 1岚12,-j0.15 p.u. 2 T2)0.15 Figure Q3. Circuit for problem 3b) (i) Assuming a balanced excitation, draw the positive, negative and zero...
PROBLEM 5 a Discuss the consequences of short circuit faults on electric power systems [5 Points...
PROBLEM 5 a Discuss the consequences of short circuit faults on electric power systems [5 Points Protective schemes are routinely used for electric power transformers. Name at least three different types of transformer protective schemes (by function) and explain briefly their principles of operation. [5 Points] Consider the system shown in the single-line diagram of Figure (4 per unit to the same base. Assume that the voltage at both sources is 1 p.u .) All reactances are shown in ind...
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 remote generator transmits energy to a major load/generation via a system shown in the drawing. Assume the generators voltage behind transient reactance to be 1.1pu, the infinite bus voltage to be 1.0 pu and the power transfer to be 0.3 pu during the steady state condition of the network. The line reactance is j0. 5 pu per line and the transient reactance of the generator isj0. 2 pu. The normalised constant of the generator H- 3KWS7KVA A 3 phase...
thanks for the help
Course ID: 103891. ELEC ENG 706, June 2017 Page 16 of 21 Question 5. [ 20 marks ] 5a) Power Systems analysis [ 7 marks The single-line diagram below represents a generator driving a load over a long transmission line with a synchronous compensator connected to the receiving end. The transmission line can be modelled as shown with an inductive reactance X - 0,4 pu and two capacitive reactances Xc-3 pu on a base of 1000...
Problem 2. A 3-phase star-connected turbo-generator feeds power to 11 kV infinite bus, through two parallel transmission lines each having a reactance of452. The generator synchronous reactance is 3 Ω. (a) The mechanical input to alternator and its excitation are adjusted as that the operating power factor at alternator terminals is unity and rated current of 500 A is delivered. Calculate the alternator terminal and excitation voltages. Also determine the active and reactive powers delivered to the infinite bus. (b)...
Question 2 A 60 Hz synchronous generator with Xd 0.2 pu transient reactance is connected to an infinite us through a transformer and the transmisiones as shown in the Figure. All system reactances are marked on the diagram and are expressed on a common MVA base. The generator dies a power of Auto busbar 1. The magnitude of the generator's excitation voltage e'is 12 pu, and the infinite bus voltage is -1.00u. If a 3-phase fault occurs at the middle...
A 50 Hz, 250 MVA synchronous generator having inertia constant H=5 MJ/MVA is connected to an infinite bus through transformer and transmission line as shown below. The transformer reactance is based on 500 MVA, while the other impedances are based on the generator MVA Infinite bus 1 2 3 XL 0.1 pu - oto G1 V= 1.0 pu X 0.1 pu Xd = 0.3 pu at 500 MVA The generator is delivering 0.8 of full load current at a power...
b) A fault occurs at bus 4 of the network shown in Figure Q3. Pre-fault nodal voltages throughout the network are of 1 +j0 p.u. and the impedance of the electric arc is neglected (Zf-0+)0p.u). The positive, negative and zero sequence impedance parameters of the generator, transmission lines and transformer are given in Figure Q3 x,(1) 30. 15 p.u. 1岚12,-j0.15 p.u. 2 T2)0.15 Figure Q3. Circuit for problem 3b) (i) Assuming a balanced excitation, draw the positive, negative and zero...
PROBLEM 5 a Discuss the consequences of short circuit faults on electric power systems [5 Points Protective schemes are routinely used for electric power transformers. Name at least three different types of transformer protective schemes (by function) and explain briefly their principles of operation. [5 Points] Consider the system shown in the single-line diagram of Figure (4 per unit to the same base. Assume that the voltage at both sources is 1 p.u .) All reactances are shown in ind...
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...
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