Upload File

example symmcomp

6
Consider a thevenin source supplying a delta/wye-grounded transformer, and assume a SLG fault at the wye-grounded side of the transformer For simplicity, we’ll neglect all resistances, and assume j1 ohm reactive impedance for each element, in all sequence networks. The symmetrical component networks for this fault condition are connected in series as seen from the fault location, as follows: At the fault location, Current at the fault location, on the faulted phase Current at the fault location, on the unfaulted phases: XS XT SLG Fault 1 pu / wye- gnd Sourc e j1 p u j1 pu 1 pu j1 pu j1 pu -ve seq j1 pu j1 pu 0-seq If1 If2 If0 IS1 IS2 IS0 +ve seq

Upload: taylor-martinez

Post on 18-Jul-2016

6 views

Category:

Documents


2 download

Report

DESCRIPTION

Example of application of symmetrical components

TRANSCRIPT

Page 1: Example SymmComp

Consider a thevenin source supplying a delta/wye-grounded transformer, and assume a SLG fault at the wye-grounded side of the transformer

For simplicity, we’ll neglect all resistances, and assume j1 ohm reactive impedance for each element, in all sequence networks. The symmetrical component networks for this fault condition are connected in series as seen from the fault location, as follows:

At the fault location,

Current at the fault location, on the faulted phase

Current at the fault location, on the unfaulted phases:

XS XT

SLG Fault1 pu

/ wye-gndSource

j1 pu j1  pu1 pu

j1  pu j1  pu-ve seq

j1  pu j1  pu0-seq

If1

If2

If0

IS1

IS2

IS0

+ve seq

Page 2: Example SymmComp

Next, consider current seen on the source side of transformer terminals (i.e. on the side of the delta-connected winding):

Consider if the result is reasonable.

Consider the following winding configuration, where the voltage on the delta side lags that on the wye-connected side by 30 degrees. With a fault on Phase a on the wye-side, current is expected to flow between phases a & b on the delta side. However current in Phase ‘c’ ought to be zero!!!

Va

Vc

Vb

va

vc

vb

Page 3: Example SymmComp

Similarly, if on the other hand the voltage on the delta connected side were to lead that on the wye-connected side by 30 degrees, as shown below:

Then a fault on Phase a on the wye-side should result in current between phases a & c on the delta side, and no current in Phase ‘b’!!!

**** What’s wrong? ***

ANSWER: We have not taken into account the phase shift resulting from the delta-wye transformation.

Let’s say we consider the case where the voltage on the delta-connected side lags the voltage on the wye-connected side by 30 degrees.

Then, in the positive sequence mode, Va_delta_pos = Va-wye_pos * e-j30

whereas in the negative sequence mode, Va_delta_neg = Va-wye_neg * e+j30

Hence

Finally,

Va

Vc

Vb

vavc

vb

Page 4: Example SymmComp

Thus, as expected, Ia = -Ib, and Ic = 0

Page 5: Example SymmComp

In this case, let’s check for energy balance:

Three phase power at the sending end

Three-phase power at the receiving end


Example: Electrostatic Potential Energy Example: Three

GENERAL HALLOWEEN · 2019-08-16 · cat 8 a cat Bean example cat 15 cat cute example cat 17 example cat 18 example Cat 31 example cat Dirty Duo example HappyYoureHom e example cat

Slide 1 - Mrs. Davis' World · Web viewExample 4 Example 4 Example 10 Example 10 Example 12 Example 12 Example 14 Example 14 Example 2 Example 2 Example 7 Example 7 Example 15 Example

Chapter 5. Example 1 Example 2 Example 3 Example 4

Multi-Scale Kernel Operators for Reflection and Rotation Symmetryvision.cse.psu.edu/research/symmComp/workshop/... · 2011. 6. 30. · CVPR 2011 – June 24 2011 Symmetry The property

Example text 1 This is an example text. Example text. Example text 2 This is an example text. Example text. Example text 3 This is an example text. Example

Symmetry Detection Competitionvision.cse.psu.edu/research/symmComp/TR-CSE-11-012.pdfSymmetry is a pervasive phenomenon presenting itself in all forms and scales in natural and manmade

Synopsis Example for Thesis | PDF Example

Lesson 4 Contents Example 1Translate a Figure Example 2Find a Translation Matrix Example 3Dilation Example 4Reflection Example 5Rotation

Kenlayer Example Kenlayer Example

Splash Screen Lesson 3 Contents Example 1Independent Events Example 2Dependent Events Example 3Mutually Exclusive Events Example 4Inclusive Events

Example: Combinatorial Control Example: Sequential Control

Detecting Bilateral Symmetry with Feature Mirroringvision.cse.psu.edu/research/symmComp/workshop/qmo_print.pdfReference: G. Loy, J. Eklundh, “Detecting Symmetry and Symmetric Constellations

Pass - Jazz...Joe Pass JAZZ LINES REH VIDEO Example 1 Cmaj7 Example 2 Example 3 Example 4 Cmaj7 Example 5 H.O. P.o. Examplc 6 H.O. Example 7 H.O. H.O. H.O. Example 8 Crnaj7 Example

Example and Non-Example

Programmable Controllers Lab Manual - Mechatronics from Programmable... · Cosimir PLC EXAMPLE. 11 EXAMPLE. 12 EXAMPLE. 13 EXAMPLE. 14 EXAMPLE. 15 EXAMPLE. 16 ... • Programmable

Example text This is an example text. Example text This is an example text. Example text This is an example text

Lesson 6 Contents Example 1Multiply Powers Example 2Multiply Monomials Example 3Divide Powers Example 4Divide Powers Example 5Divide Powers to Solve a

Devonian Example Ordovician Example Triassic Examples

Symmetry Detection Competition - LPACvision.cse.psu.edu/research/symmComp/workshop/Symmetry... · 2011-07-01 · symmetry, second best on rotation symmetry and last translation symmetry

Propositional Logic Example Example Example · Propositional Logic Example Example Example Consider the following sentences: 1 If it rains, the aquaphobes won’t vote 2 John will

Introduction mood what example how personality anger example sorrow example humour example Home Page rules

Lesson Menu Main Idea Example 1:Write an Algebraic Equation Example 2:Real-World Example Example 3:Real-World Example

Example Restricted Appraisal Report - Southsfreappraisal.com/.../docs/Example-Restricted-Industrial-Condo.pdf · Example Industrial Condominium, Doral, FL I ... Example Restricted

Example ANSWER x(x+1). Example Example ANSWER 1

Example Scripts - Cisco ... Example Scripts. The Example Scripts

Specification by Example - By Example

Supplemental Document: Anisotropic Spherical Gaussianskun/asg/...ASG 1 ASG 2 approx. ref. ASG 1 ASG 2 approx. ref. Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example

Splash Screen. Lesson Menu Objectives Vocabulary Example 1 Example 2 Example 3 Example 4 Quick Quiz

Example for Six Sigma( Indian Example)

Property address 1 Example Block Example Road, Example ......Property address 1 Example Block, Example Road, Example Town, Example County, Example PC 8 1 1 1 Open plan living room

Image-based Modelingvision.cse.psu.edu/Research/SymmComp/Workshop/Ibm-longQuan.pdfmodeling) Objects are of different natures: Smooth objects (surface reconstruction) Curvilinear objects

Parsing Image Facades with Reinforcement Learningvision.cse.psu.edu/research/symmComp/workshop/Shape Grammars.pdfParsing Image Facades with Reinforcement Learning Symmetry Detection

Example 1 Example 2 Allowed Not Allowed Example 3

print job - dociwebgitar.files.wordpress.com · example 10 over over solo all over acain/second soto example 11 example 12 example 13 example 14 example 15 example 16 example 17 18