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Combining Transmission Line Protection with Voltage Stability Monitoring

This paper introduces a Relay-Based Local Identification of Voltage Emergency (RLI) for voltage instability detection and considers ways to avoid undesirable line disconnections by distance protection during long-term voltage instability. The RLI stems from the previously presented New LIVES Index (NLI), which is calculated by processing voltage/current phasor measurements from Phasor Measurement Units (PMUs) at transmis-sion substations on the boundaries of a weak system area. Dis-tance relays of transmission lines can similarly calculate the RLI in a similar time scale. The RLI should not provide false alarm during the occurrence of a remote short-circuit fault, whereas it should provide an early alarm before any of the critical trans-mission lines forming a corridor is tripped by any distance ele-ment. Comparison between the alarms provided by NLI and RLI is performed using simulation studies of the Nordic Test System where a case of unwanted Zone-3 tripping is identified.

Author(s):

Vassilis Nikolaidis    
Democritus University of Thrace
Greece

Panagiotis Mandoulidis    
National Technical University of Athens
Greece

Costas Vournas    
National Technical University of Athens
Greece

 

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