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This paper describes typical developments of blackouts from simple cause to cascading outages. The involvement of the protection system at the beginning and during the enlargement of the incident to the blackout will be shown. Measures to avoid cascading protection tripping will be presented. A new method will be proposed to assess the quality and security of protection systems which can be applied...
Single-pole auto-reclosing is an approved method to enhance the reliability in transmission systems. But with increasing system voltage, the maximum line length, for which a common single-pole auto-reclosing is successful, decreases. Therefore this paper will show how single-pole auto-reclosing can also be applied in extra and ultra high voltage transmission systems, by extending the system with high-speed...
This paper will show the analytical analysis of multiple parallel line corridors with their mutual coupling and inter infeeding effects. Based on a generic model in symmetrical components the analytical description of the measured impedances of distance protection relays on faulty and unfaulty parallel lines will be presented. Based on that, worst case considerations will be carried out. They will...
This paper describes an advanced coordination method for an optimized protection time grading based on a new nonstandard tripping characteristic for overcurrent protection relays. The intention is the highest possible reduction of tripping times for a selective fault clearing in distribution networks protected by overcurrent relays without communication links. The new nonstandard tripping characteristic...
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