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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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