• Draw the single line diagram of a substation having the following equipments: i) Incoming lines: Two, 110kV • ii) Outgoing lines: (a) One, 110kV (b) Four, 11kV iii) Transformers: (a) Two, 10MVA, 110/11kV, D/Y (b) One, 2MVA, 11kV/ 415V,Y/Y • iv) Bus-bars: 110kV-Duplicate bus-bar, 11kV single bus-bar Show the positions of CTs, PTs, isolators, lightning arresters, circuit breakers.

• Draw the single line diagram of a substation having the following equipments: i) Incoming lines: Two, 110kV • ii) Outgoing lines: (a) One, 110kV (b) Four, 11kV iii) Transformers: (a) Two, 10MVA, 110/11kV, D/Y (b) One, 2MVA, 11kV/ 415V,Y/Y • iv) Bus-bars: 110kV-Duplicate bus-bar, 11kV single bus-bar Show the positions of CTs, PTs, isolators, lightning arresters, circuit breakers.

Power System Analysis and Design (MindTap Course List)

6th Edition

ISBN:9781305632134

Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Chapter3: Power Transformers

Section: Chapter Questions

Problem 3.49P: Consider the single-Line diagram of a power system shown in Figure 3.42 with equipment ratings...

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Similar questions

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 a single-phase electric system shown in Figure 3.33. Transformers are rated as follows: XY15MVA,13.8/138kV, leakage reactance 10 YZ15MVA,138/69kV, leakage reactance 8 With the base in circuit Y chosen as 15MVA,138kV determine the per-unit impedance of the 500 resistive load in circuit Z, referred to circuits Z, Y, and X. Neglecting magnetizing currents, transformer resistances, and line impedances, draw the impedance diagram in per unit.
Three single-phase distribution transformers, each rated for 18 kVA, 20000/220 volts, are connected in a Dy three-phase bank. For convenience, at the factory, the OCT and the SCT were per- formed as per standards with the whole three-phase bank already connected and the measured values were as follows: Vline 381.051V, line 1.78436A, P30 = 372.414 W. Vline = 5656.85 V, Iline = 1.55885 A, P30 = 2160 W. Three phase bank of single phase transformer on a utility pole. 37.5 K (a) Find the single phase equivalent circuit referred to the low volt- age side. (b) Find the transformer regulation at the rated load and voltage and a power factor of 0.45 lagging (Neglect the excitation current). (c) Using the "load" model, what is the approximate transformer- bank's efficiency, n, under these conditions of load? (a) R2 X=2 Rsc=mXsc = mS (b) Vreg= (c) n = %
2) For a given short-circuit calculation utilizing the per unit method, a base voltage of 480 V and a base power of 2500 kVA are chosen. Calculate the following: a. Base current. b. Base impedance.
Q4: Draw the single line diagram of a substation having the following equipments: i) Incoming lines: Two, 400kV ii) Outgoing lines: (a) four, 400kV (b) four, 33kV iii) Transformers: (a) One, 100MVA, 400/132KV, D/Y (b) One, 20MVA, 132kV/33 D/Y11, One, MVA, 33KV/420V,Y/Y iv) Bus-bars: 400 kV-Duplicate bus-bar, 11kV single bus-bar, 33kV single bus-bar Show the positions of necessary equipments that using for protections, measurements and communications.
e 6 e ● Draw the single line diagram of a substation having the following equipments: i) Incoming lines: Two, 110kV ii) Outgoing lines: (a) One, 110kV (b) Four, 11kV iii) Transformers: (a) Two, 10MVA, 110/11kV, D/Y (b) One, 2MVA, 11kV/ 415V,Y/Y iv) Bus-bars: 110kV-Duplicate bus-bar, 11kV single bus-bar Show the positions of CTS, PTs, isolators, lightning arresters, circuit breakers.
In the following network, the voltage magnitudes at all buses are equal to 1 p.u., the voltage phase angles are very small, and the line resistances are negligible. All the line reactances are equal to j1 p.u. (1) (2. P₂ = 0.1 p.u. P3 = 0.2 p.u. The voltage phase angle 83 in radian at bus 3 is (Assume one of the generator bus as slack bus and sin-¹ (0.1) = 0.1 rad) (a) -0.1 (b) -0.2 (c) 0.1 (d) 0
Draw the single line diagram of a substation having the following equipments: i) Incoming lines: Two, 132kV ii) Outgoing lines: (a) Five, 132kV (b) Five, 33kV iii) Transformers: (a) One, 25MVA, 132/33kV, D/Y (b) One, 2MVA, 33kV/ 420V,Y/Y iv) Bus-bars: 132 kV-Duplicate bus-bar, 33kV single bus-bar Show the positions of necessary equipments that using for protections, measurements and
Draw the single line diagram of a substation having the following equipments: i) Incoming lines: Two, 132kV ii) Outgoing lines: (a) Five, 132kV (b) Five, 33kV iii) Transformers: (a) One, 25MVA, 132/33KV, D/Y (b) One, 2MVA, 33KV/ 420V,Y/Y iv) Bus-bars: 132 kV-Duplicate bus-bar, 33kV single bus-bar Show the positions of necessary equipments that using for protections, measurements and communications.
b) The one-line diagram for a simple power system is given in Figure 1(b). į. Draw the impedance diagram of the system. i. Construct the bus admittance matrix, Xeus and bus impedance matrix, Zous of the system. I. Evaluate the fault current, bus voltages and line current during the flow when a balanced three-phase fault occurs on bus 1. bus 1 bus 2 j65 N G G 25 MVA 25 MVA 13.8 kV 15% 13.2/69 kV 11% 25 MVA 69/13.2 kV 11% 15 MVA 13 kV 15% Figure 1(b) m
A 30-MVA alternator with 15% reactance is connected to a bus bar. A second alternator rated 25-MVA with 10% reactance is also connected through a 10% bus bar reactor to the same bus bar. Both of these reactances are based on 25 MVA. If a feeder taken out from the bus bars through a circuit breaker develops a 3-phase fault, what should be the appropriate MVA rating of the circuit breaker?(325 MVA)
.18 Assume that a 5 mile long feeder is supplying a 2000 kVA load of increasing load density starting at a substation. If the K constant of the feeder is given as 0.00001%VD per kVA-mi, determine the following: (a) The percent voltage drop in the main. (b) Repeat part (a) but assume that the load is a lumped-sum load and connected at the end of the feeder. (c) Repeat part (a) but assume that the load is distributed uniformly along the main.