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- Figure 3.39 shows a oneline diagram of a system in which the three-phase generator is rated 300 MVA, 20 kV with a subtransient reactance of 0.2 per unit and with its neutral grounded through a 0.4- reactor. The transmission line is 64km long with a cries reactance of 0.5-/km. The three-phase transformer T1 is rated 350MVA.230/20kV with a leakage reactance of 0.1 per unit. Transformer T2 is composed of three single-phase transformers, each rated 100 MVA, 127/13.2kV with a leakage reactance of 0.1 per unit. Two 13.2kV motors M1 and M2 with a subtransient reactance of 0.2 per unit for each motor represent the load. M1 has a rated input of 200 MVA with its neutral grounded through a 0.4- current-limiting reactor, M2 has a rated input of 100 MVA with its neutral not connected to ground. Neglect phase shifts associated with the transformers. Choose the generator rating as base in the generator circuit and draw the positive-sequence reactance diagram showing all reactances in per unit.Consider the single-Line diagram of a power system shown in Figure 3.42 with equipment ratings given: Generator G1: 50MVA,13.2kV,x=0.15p.u. Generator G2: 20MVA,13.8kV,x=0.15p.u. Three-phase -Y transformer T1: 80MVA,13.2/165YkV,X=0.1p.u. Three-phase Y- transformer T2: 40MVA,165Y/13.8kV,X=0.1p.u. Load: 40MVA,0.8PFlagging,operatingat150kV Choose a base of 100 MVA for the system and 132-kV base in the transmission-line circuit. Let the load be modeled as a parallel combination of resistance and inductance. Neglect transformer phase shifts. Draw a per-phase equivalent circuit of the system showing all impedances in per unit.The busbars of a gonerating station are divided into two soctions A and B by a busbar reactor rated at 8000KVA with 9% reactive drop. On busbar A there are two generators each of 8000 KVA with 12.5% reactance and on busbar B there are two generatore each of 10,000KVA with 10% reactance. Feeders are taken. from sections A and B separately. Calculate the rupturing capacity of each foeder switchgear for 3-phase faults which may occur on any feeder. Ans: Feeder A 189 MVA; Feeder B 252 MVA
- A generator operating at 50Hz delivers 1 pu power to an infinite bus through a transmission circuit inwhich resistance is ignored. A fault takes place reducing the maximum power transferable to 0.5 puwhereas before the fault, this power was 2.0pu and after the clearance of the fault, it is 1.5 pu. By theuse of equal area criterion, determine the critical clearing angle.A power transmission line of 11kV (maximum) carries a maximum current of 200A is connecting the two areas. A PMMC voltmeter of (0-300V) range and a PMMC ammeter of (0-10A) range are to be used for measurement of voltage and currents of the transmission line. 1.Design and draw a circuit with suitable instrument transformers for the measurement. Use sample values for winding turns. 2.On a particular day, the readings shown by the meters were 7.5A and 240V. Calculate the actual voltage and current in the transmission line.Question 2 A generator having H = 6.0 MJ /MVA is delivering power of 1 .0 per unit to an infinite bus through a purely reactive network when the occurrence of a fault reduces the generator output power to zero. The maximum power that could be delivered is 2.5 per unit. When the fault is cleared, the original network conditions again exist. Calculate: a) The critical clearing angle. b) The critical clearing time.
- A generating station has 4 sections busbars. Bach section busbar has a generator connected to it of rating 5000KVA,10% reactance and also each busbar is connected to a tibbar through reactors each having 7.5% reactance based upon the rating of the generator counected to it. Find the short circuit KVA, when thore is a 3-phase fault between the lines on one of the sections of busbars (a) with and (b) without reactors. The answers must be the ff: Ans: (a) 87,500KVA (b) 200,000KVAA generating station has 4 sections busbars. Bach section busbar has a generator connected to it of rating 5000KVA,10% reactance and also each busbar is connected to a tibbar through reactors each having 7.5% reactance based upon the rating of the generator counected to it. Find the short circuit KVA, when thore is a 3-phase fault between the lines on one of the sections of busbars (a) with and (b) without reactors. Ans: (a) 87,500KVA (b) 200,000KVA(a) Which parameter is the most important in case of determining the rating of a circuit breaker and why? (b) In the given picture, would there be any difference in calculation of the transformers, if you choose primary or secondary side? Explain in words. Answer follow image.
- 2.14 The resistances and leakage reactances of a 40-kVA 60-Hz 7.97-kV-V:240-V single-phase distribution transformer are R1 = 41.6 2 R2 = 37.2 m X1, = 42.1 2 X, = 39.8 m2 where subscript 1 denotes the 7.97-kV winding and subscript 2 denotes the 240-V winding. Each quantity is referred to its own side of the transformer. a. Draw the equivalent circuit referred to (i) the high- and (ii) the low-voltage sides. Label the impedances numerically. b. Consider the transformer to deliver its rated kVA to a load on the low-voltage side with 240 V across the load. (i) Find the high-side terminal voltage for a load power factor of 0.87 power factor lagging. (ii) Find the high-side terminal voltage for a load power factor of 0.87 power factor leading. c. Consider a rated-kVA load connected at the low-voltage terminals. Assuming the load voltage to remain constant at 240 V, use MATLAB to plot the high-side terminal voltage as a function of the power-factor angle as the load power factor varies from…90KVA, 460/230 3Phase transformer, Determine the Primary Conductor Size (include the AWG size number), Secondary Conductor Size (include the AWG size number), Primary Protection Breaker, and Secondary Protection Breaker. uarnAn autotransformer is used to connect a 6 kV distribution line to a 7.5 kV distribution line. It must be capable of handling 1 MVA. There are three phases, connected Y-Y with their neutrals solidly grounded. ROUND YOUR ANSWERS TO ONLY TWO DIGITS TO THE RIGHT OF THE DECIMAL POINT. (a) What must the Ncommon: Nseries turns ratio be to accomplish this connection? (b) How much apparent power must the wind- ings of each autotransformer handle? (c) If one of the autotrans- formers were reconnected as an ordinary transformer, what would its ratings be? Autotransformer connecting two three phase power systems. xlgc 301 (a) Ncommon: Nseries: (b) Power rating of each winding: kVA (c.1) Power rating of each single phase transformer: (c.1) High voltage rating of each single phase transformer: kV KVA (c.1) Low voltage rating of each single phase transformer: kV