25-08-2012, 11:18 AM
Auto - Reclosing
Auto - Reclosing.pptx (Size: 231.29 KB / Downloads: 51)
Benefits Of Auto - Reclosing
Minimizing the interruption of supply
Maintenance of system stability and Synchronism
Minimum Outage and least expenditure of manpower
Ability to run substation unattended
FACTORS CONSIDERED IN HIGH SPEED AUTO RECLOSING ON
EHV SYSTEMS
Protection Characteristics
De- Ionization of Fault Arc
Circuit Breaker Characteristics
Reclaim Time
Number of Shots
SINGLE PHASE AUTO – RECLOSING
Maintenance of System Integrity
Reduced switching overvoltage due to reclosing
Reduced shock to generators.
Sudden changes in mechanical output are less
Delayed Auto-Reclose Application
1. Densely interconnected systems.
Where the Loss of a single line is unlikely to cause loss of synchronism between two ends
2. Dead Time is allowed to be long enough for any power swings due to fault and tripping allowed to decay before reclosing
a) Less shock to system than with high speed A/R
b) Problems of arc de – ionization times, and circuit breaker operating charactersitics are eliminated
Auto - Reclosing.pptx (Size: 231.29 KB / Downloads: 51)
Benefits Of Auto - Reclosing
Minimizing the interruption of supply
Maintenance of system stability and Synchronism
Minimum Outage and least expenditure of manpower
Ability to run substation unattended
FACTORS CONSIDERED IN HIGH SPEED AUTO RECLOSING ON
EHV SYSTEMS
Protection Characteristics
De- Ionization of Fault Arc
Circuit Breaker Characteristics
Reclaim Time
Number of Shots
SINGLE PHASE AUTO – RECLOSING
Maintenance of System Integrity
Reduced switching overvoltage due to reclosing
Reduced shock to generators.
Sudden changes in mechanical output are less
Delayed Auto-Reclose Application
1. Densely interconnected systems.
Where the Loss of a single line is unlikely to cause loss of synchronism between two ends
2. Dead Time is allowed to be long enough for any power swings due to fault and tripping allowed to decay before reclosing
a) Less shock to system than with high speed A/R
b) Problems of arc de – ionization times, and circuit breaker operating charactersitics are eliminated