protección direccional de sobrecorriente

8/18/2019 Protección Direccional de Sobrecorriente

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Curso Avanzado de Protección deSistemas Eléctricos de Potencia

Protección Oireccional de

Sobrecorriente

Material donado por Schweitzer Engineering Laboratories para suuso en este curso

C'pyo;,h!" SEL2001

Directional Overcurrent ProtectionBasicPrincipie

v ,

166)-- --6)-z; ~

F2 F,

Forward Fault (F,) Reverse Fault (F2)

\,~v

1\ ~v

Directional Overcurrent Protection

Basic Applications (2)

ef: ~---u~ -+--

Traditional Une DirectionalOvercurrent Protection

Directional Overcurrent Protection

Basic Applications (1)

ei:::J

Directional Relay OperationCharacteristic

Vlcos«p -


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90° Phase Directional Element

Connection

Load

Fault - MTL

la ~~~- Voltage Currenta, no - - u -_uu

Vbe la

e

Vo,

Vea lb

leVab

~ b

. 'h V

6H~[l.

ITilJ

ZTO ZlO

Current

310~,,,

-3V: ~0-310

Voltage

3Vo- 3Vo

-310310

'PMT= 60° (Lagging)

Three Ways of Obtaining 310

-- lo a

b

e

- 310 310

2

-- -


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310- Polarized Ground Directional ElementConnection

ab g=

+- 310T

e

310T t

310L--

--310L

Digital Solutions for Une DirectionalOvereurrent Proteetion

Numerieal Relay Platform

lA la le VA Va Ve

Trip

Direetional Element

Design and Evaluation

Jeff Roberts and Armando Guzmán

Schweitzer Engineering LaboratoriesPullman, WA USA

Direetional-Element Topies

. Input Selection

. Security Problems and Remedies

. Conventional Elements

3

Conventional Relay Panel

lA VBC la VeA le VAs IR 3Vo

67A 678 67C 67N

:-§ :-8 :-§ :-8I 32A I I 328 I I 32C I I 32N II I

:8:

I I

:8::8: I I

:e: I I

I 50/51 I I 50/51 I I 50/51 I I 50/51 II I I I I I I I----_J ---_J ---_J "---_J

Trip Trip Trip Trip


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Direetional-Element Topies

. Positive-Sequence Element

. Improved Negative-SequenceElement

. Superposition Positive-SequenceElement

Phase Directional-Element Design

90° Conneeted-PhaseDireetional-Element Torque Equation

T~O

lop

VPOl

T =llop 1-1 VpOl ¡-cos (LVPOl -Iop)

Why Use Direetional Elements?

. Determine Fault Direction. Supervise Distance Elements

. Form Quadrilateral GroundDistance Characteristics

90° Conneeted-PhaseDireetional-Element Input Quantities

900-Conneeted, Phase-Directional ElementT > Ofor Forward Three-Phase Faults

BusS BusR

4

Operating Polarizing

Phase Quantity (Iop) Quantity (Vrol)

A lA VPOlA =VSC

B lB VpOlS=VCA

e le VpOlC = VAS


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Reverse SLG Fault With Strong

Remote Zero-Sequence Infeed

BuA-Phase

Fault

BusR

Possible Phase-

Directional Element Solutions

. Require Agreement of al! DirectionalElements

. Supervise With Phase-PhaseOvercurrent Element

. Block Directional-Element DecisionBased on 310Level

T32P Must Exceed

Minimum Threshold to

Declare Fault Direction

Reverse SLG Fault

May Cause Relay Misoperation

Relay 1 Relay 2

Vpa,,=VeV,o,"

fA' fe' le

VpalA=Vec VpalA

Positive-SequenceDirectional Element

T32P =13V,I-131,I-cos [¿3V, - (¿31,+ ¿lL,)]

T32P Cannot Operate for

Zero-Voltage, Three-Phase Faults

5


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Memory-Polarized T32P Element

T32P uses V1MEMtor V1POl

to Overcome Sensitívity Problems

for Clase-In, Three-Phase Faults

T32P Relay2 Misoperatesfor Out-of-Section BC Fault

Relay 11,.1¿Z"

Relay 2

v,

v,

1,.1¿Zc,

Traditional Negative-SequenceDirectional Element

T32Q =13V, 1.131,lcos [L - 3V, - (¿31, + ¿Zl1)]

T32PPerfor mance forOut-of-Section Phase-Phase Faults

Bus S Bus R

Source SES ¿ 30.

Line 1

Z" "ZR,"jO.80 Z" =j4


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T32PQResponsefor

Out-of-SectionPhase-to-Phase Fault

T32Q

T32P

= -50.13

= 148.52

T32PQ = -13.00

Summary

. Positive- and Negative-SequenceDirectional Elements Improve Scheme

Security.

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protección direccional de sobrecorriente

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