Sequence Components (Tutorial)

S. A. Soman Department Of Electrical Engineering, Iit Bombay

Description

Problem 1 Problem 2 Problem 3 Problem 4 Problem 5 Problem 6 Problem 7 Problem 8 Problem 9 Problem 10SequenceComponents(Tutorial)S. A. SomanDepartment of Electrical Engineering,IIT BombayS. A. Soman Department of Electrical Engineering, IIT BombaySequenceComponents(Tutorial)Problem 1 Problem 2 Problem 3 Problem 4 Problem 5 Problem 6 Problem 7 Problem 8 Problem 9 Problem 10Outline1 Problem 12 Problem 23 Problem 34 Problem 45 Problem 56 Problem 67 Problem 78 Problem 89 Problem 910 Problem 10S. A. Soman Department of Electrical Engineering, IIT BombaySequenceComponents(Tutorial)Problem 1 Problem 2 Problem 3 Problem 4 Problem 5 Problem 6 Problem 7 Problem 8 Problem 9 Problem 10Problem 1The currents in a 3 - unbalanced system are given by! ! !I = (10 +j4)A; I = (11 j9)A; I = ( 15 +j9)Aa b cCalculate the positive, negative and zero sequence currents.S. A. Soman Department of Electrical Engineering, IIT BombaySequenceComponents(Tutorial)Problem 1 Problem 2 Problem 3 Problem 4 Problem 5 Problem 6 Problem 7 Problem 8 Problem 9 Problem 10Problem 2The zero, positive and negative sequence voltages of phase ‘a’! ! !are given below. Find out the phase voltagesV ,V andVa b c! ! ! V = 200\0 ; V = 210\ 30 ; V = 150\1900 1 2S. A. Soman Department of Electrical Engineering, IIT BombaySequenceComponents(Tutorial)Problem 1 Problem 2 Problem 3 Problem 4 Problem 5 Problem 6 Problem 7 Problem 8 Problem 9 Problem 10Problem 3A 20MVA, 6.6kV 3-phase ...

Informations

• Publié par: Sheaz
• Nombre de lectures: 167
• Langue: Norwegian

Extrait

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Department of Electrical Engineering, IIT Bombay

S. A. Soman

Sequence Components (Tutorial)

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S. A. Soman Department of Electrical Engineering, IIT Bombay

Outline

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Problem 1

The currents in a 3 -φ unbalanced system are given by −→−→−→ I a = ( 10 + j 4 ) A , I b = ( 11 − j 9 ) A , I c = ( − 15 + j 9 ) A

Calculate the positive, negative and zero sequence currents.

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Problem 2

The zero, positive and negative sequence voltages of phase ‘a’ −→−→−→ are given below. Find out the phase voltages V a , V b and V c −→−→−→ V 0 = 200 ∠ 0 ◦ , V 1 = 210 ∠ − 30 ◦ , V 2 = 150 ∠ 190 ◦

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Problem 3

A 20MVA, 6.6kV 3-phase generator has a positive sequence impedance of j1.5 Ω , negative sequence impedance of j1.0 Ω and zero sequence impedance of j0.5 Ω . and Z n = 0 (a) If a single phase to ground fault occurs on phase ‘a’ find out the fault current. (b) If the fault is through an impedance of j2 Ω , what will be the fault current?

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In a 3 φ system, if the per unit values of positive, negative and zero sequence reactances are given by j 0 . 1, j 0 . 085 and j 0 . 05 respectively. Determine the fault current, if the fault is of the following types (a) L-L-G (b) L-L.

Problem 4

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Calculate the positive, negative and zero sequence impedance of a feeder if its self impedance is j1.67 Ω and mutual impedance is j0.67 Ω . Self impedance Z s = 1 . 67 Ω and mutual impedance Z m = 0 . 67 Ω

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Problem 6

Assuming b phase to be reference phasor define the sequence transformation matrix.

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Problem 7

Comment if the two sequence transformations obtained by taking ‘a’ phase and ‘b’ phase as reference are identical or not.

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In problem No. 2 if the data represented sequence components with ‘b’ phase as reference phasor, instead of ‘a’ phase, −→−→−→ compute V a , V b and V c . Comment on the result.

Problem 8

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Analyze a bolted S-L-G fault on phase ‘b’ of an unloaded transmission line using sequence components with b phase as reference phasor.

Problem 9

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