Unsymmetrical Faults on Power Systems

EE 605 · Chapter 5

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5.

Unsymmetrical Faults on Power Systems

5.1

Sequence Networks of Synchronous Generators

2 questions
  1. 2082 BhadraChapter 5: Unsymmetrical Faults on Power Systems5.1 Sequence Networks of Synchronous Generators

    Draw the positive, negative and zero sequence network for the following system. Assume the system is unloaded and operating at nominal voltage.

    [IMAGE: Figure from the original question paper with labels: G₁–T₁ (bus A–B), line L₁ (B–C), line L₂ (C–D), T₂–G₂ (D–E); G₃–T₃ connected at C via F]
    X₁ (p.u.)X₂ (p.u.)X₀ (p.u.)
    G₁0.50.20.18
    G₂0.330.150.15
    G₃0.2750.10.12
    T₁0.20.20.2
    T₂0.1670.1670.167
    T₃0.1430.1430.143
    L₁0.0830.0830.4
    L₂0.1030.1030.6
    ASK ON:ChatGPTClaudeAnswers · -8 marks Asked 1×
  2. 2079 BhadraChapter 5: Unsymmetrical Faults on Power Systems5.1 Sequence Networks of Synchronous Generators

    Draw the positive, negative and zero sequence impedance networks for the power system shown in figure below. Choose a base of 50 MVA, 220 kV in 50 Ω transmission lines and mark all reactances in pu. The ratings of the generators and transformers are:

    Generator 1: 25 MVA, 11 kV, X'' = 20%

    Generator 2: 25 MVA, 11 kV, X'' = 20%

    Three-phase transformer (each): 20 MVA, 11 Y/220 kV, x = 15%

    The negative sequence reactance of each synchronous machine is equal to its substransient reactance. The zero sequence reactance of each machine is 8%. Assume that the zero sequence reactances of lines are 25% of their positive sequence reactances.

    [IMAGE: Figure from the original question paper with labels: Two j50 Ω lines; X = 5% at machine 1 rating; X = 5% at machine 2 rating]
    ASK ON:ChatGPTClaudeAnswers · -8 marks Asked 1×
5.2

Fault Calculations of a Single Synchronous Generator

21 questions
  1. 2080 Bhadra2075 AshwinChapter 5: Unsymmetrical Faults on Power Systems5.2 Fault Calculations of a Single Synchronous Generator

    A 25 MVA, 13.2 kv alternator with solidly grounded neutral had a subtransient reactance of 0.25 pu. The negative and zero sequence reactances are 0.35 and 0.1 pu respectively. A line to line fault occurs at the terminals of an alternator. Determine the line to line voltages under fault conditions. Neglect resistance.

    ASK ON:ChatGPTClaudeAnswers · -8 marks Asked 2×
5.3

Path for Zero Sequence Currents in Transformers

1 question
5.4

Fault Calculations on a Power System Networks

18 questions
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