Q2: Draw the single line diagram of a substation having the following equipments: (1) Incoming lines: Two, 400kV (2) Outgoing lines: (a) Two 400kV, (b) four, 132kV (C) Three, 33kV (3) Transformers: (a) Two 250MVA, 400/123KV D/Y11 (b) One, 25MVA, 132/33kV, D/Y11 (C) One, 2MVA, 33kV/ 420V,Y/Y (4) Bus-bars: 400KV Duplicate bus-bar, 132 kV- Duplicate bus-bar, 33kV single bus-bar, 0.42KV single bus-bar Show the positions of necessary equipments that using for protections, measurements and communications.

Q2: Draw the single line diagram of a substation having the following equipments: (1) Incoming lines: Two, 400kV (2) Outgoing lines: (a) Two 400kV, (b) four, 132kV (C) Three, 33kV (3) Transformers: (a) Two 250MVA, 400/123KV D/Y11 (b) One, 25MVA, 132/33kV, D/Y11 (C) One, 2MVA, 33kV/ 420V,Y/Y (4) Bus-bars: 400KV Duplicate bus-bar, 132 kV- Duplicate bus-bar, 33kV single bus-bar, 0.42KV single bus-bar Show the positions of necessary equipments that using for protections, measurements and communications.

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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A 3-phase generator (30 MVA, 13.8 KV, 0.15) supplies two motors (rated at 20 MVA, 12.8 KV, 20%, and 10 MVA, 12.8 KV, 20%, respectively) through a step-up transformer - transmission line - step- down transformer arrangement. The 3-phase transformers are rated at 35 MVA, 13.2 KV-A/115 KV-Y with 10 % leakage reactance. The line reactance is 80 ohms. Draw the equivalent per unit reactance diagram by selecting 30 MVA, 13.8 KV in the generator circuit. Also, calculate the current supplied by the source and the currents of each motor
The subject is: Smart Grid Applications and Technologies
The fault current level of a circuit breaker used in a transmission line with phase voltage 2.2 kV and breaking capacity 60 MVA is ......................kA. Complete the answer.
Q2: Draw the single line diagram of a substation having the following equipments:(1) Incoming lines: Two, 400kV(2) Outgoing lines: (a) Two 400kV, (b) four, 132kV (C) Three, 33kV(3) Transformers: (a) Two 250MVA, 400/123KV D/Y11 (b) One, 25MVA, 132/33kV,D/Y11 (C) One, 2MVA, 33kV/ 420V,Y/Y(4) Bus-bars: 400KV Duplicate bus-bar, 132 kV-Duplicate bus-bar, 33kV single bus-bar,0.42KV single bus-barShow the positions of necessary equipments that using for protections, measurements andcommunications.
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.
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.
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Consider the system shown in the single-line diagram of Figure (3). All reactances are shown in per unit to the same base. Assume that the voltage at both sources is 1 p.u. a Find the fault current due to a bolted- three-phase short circuit at bus 3 b- Find the fault current supplied by each generator and the voltage at each of the buses 1 and 2 under fault conditions 0.06 p.u. 0.2 p.u. 0.04 p.u. 0.25 p.u. 0.2 p.u. 0.2 p.. 0.2 p.u. 0.06 p.u. 0.25 p.u. Figure (3) Single-line diagram ele ver ele 888 ele 0.06 p.u. 0.25 p.u.
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The system values are given below. The bus 1 voltage after fault = 1.5 p.u The bus 2 voltage after fault = 1.2 p.u The line admittance between bus 1 and bus 2 (Y12 ) is = 0.8 p.u The post fault current current flow between bus 1 and 2 is ..............
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