Title :
Adjusting third zone distance protection to avoid voltage collapse
Author :
Nikolaidis, V.C. ; Savvopoulos, N. ; Safigianni, A.S. ; Vournas, C.D.
Author_Institution :
Democritus Univ. of Thrace (DUTH), Xanthi, Greece
Abstract :
Undesirable distance relay operations are possible to be initiated under heavy stressed system conditions leading to voltage instability. This can result in cascaded outages in the transmission system that may cause severe system deterioration. A number of recent blackouts have been reported to be initiated from undesired distance protection operations. This paper proposes an adaptive distance relaying scheme that avoids undesirable third zone tripping during the evolution of voltage instability phenomena. The relaying scheme is based on local measurements and provides the necessary time for other emergency controls like undervoltage load-shedding to be applied, if needed, in order to mitigate system collapse.
Keywords :
load shedding; power system dynamic stability; power transmission reliability; relay protection; adaptive distance relaying scheme; distance third zone distance relay protection; load shedding; power blackout; power outage; third zone tripping; transmission system; voltage collapse avoidance; voltage instability; Delay effects; Impedance; Power transmission lines; Protective relaying; Trajectory; Transmission line measurements; Adaptive protection; distance relaying; loadshedding; voltage stability; zone 3;
Conference_Titel :
Power Systems Computation Conference (PSCC), 2014
Conference_Location :
Wroclaw
DOI :
10.1109/PSCC.2014.7038392