Distance Protn Carrier Scheme Rev 1
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Transcript of Distance Protn Carrier Scheme Rev 1
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DISTANCE PROTECTION CARRIER SCHEMES
By
Y. k. Pandharipande.
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DISTANCE PROTECTION CARRIER SCHEMES
NEED FOR TELE-PROTECTION CHANNEL Conventional 3 Zone Distance Protection results in delayed
Zone 2 trip for end zone faults (last 20%)
Faults hanging up to Zone 2 time may cause instability.
Non-simultaneous tripping at near and far end precludes the possibility of applying high speed auto-reclosing, which further aggravates system stability.
Simultaneous tripping can be achieved by inter-locking both end relays through a signalling channel (PLCC, Micro-wave, Pilots, Fibre Optic). Information transmitted can be:
Trip Order (for internal faults) Block Order (for external fault)
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DISTANCE PROTECTION CARRIER SCHEMES
3 ZONE DISTANCE PROTECTION
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DISTANCE PROTECTION CARRIER SCHEMES
PERMISSIVE UNDER REACH TRANSFER TRIP (PUR)
AIDED TRIP LOGIC FOR FAULT AT F1
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DISTANCE PROTECTION CARRIER SCHEMES
PERMISSIVE OVER-REACH TRANSFER TRIP (POR)
AIDED TRIP LOGIC FOR FAULT AT F1
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DISTANCE PROTECTION CARRIER SCHEMES
PERMISSIVE OVER- REACH TRANSFER TRIP (POR)
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DISTANCE PROTECTION CARRIER SCHEMES
IDEAL BLOCKING SCHEME
AIDED TRIP LOGIC FOR FAULT AT F1
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DISTANCE PROTECTION CARRIER SCHEMES
PRACTICAL BLOCKING SCHEME
AIDED TRIP LOGIC FOR FAULT AT F1
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DISTANCE PROTECTION CARRIER SCHEMES
COMPARISON OF INTER-TRIP & BLOCKING SCHEME.
1. INTER-TRIP SCHEME
Signal Attenuation, being sent on a faulted line. This can be over come by inter-phase or inter-circuit coupling.
No intentional delay.
POR schemes are suitable for short lines tied up to weak sources, where S.I.R. (Zs/Zl Ratio) is low. Also suitable for Series Compensated Lines.
2. BLOCKING SCHEME
No attenuation since signal sent on a healthy line.
Aided trip is intentionally delayed to allow signal transmission time for blocking signal to be received on external fault.
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DISTANCE PROTECTION CARRIER SCHEMES
WEAK INFEED SCHEME OPTION (FOR POR SCHEME)
WEAK INFEED LOGIC FOR FAULT AT F1
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DISTANCE PROTECTION CARRIER SCHEMES
ZONE 1 EXTENSION SCHEME (NO CARRIER)
Contact from A/R to reset Zone 1 Extn to Zone 1 during Dead Time.