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چکیده
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Electric power systems constantly encounter disturbances and faults, necessitating fast and precise identi-cation and recti-cation of these issues. 'is is crucial for ensuring the stability and reliability of the system. 'is paper introduces a protection scheme for accelerating the second zone operation of the distance relay during internal faults. 'e proposed scheme exploits the locus of power with positive power characteristics to e0ectively distinguish between internal and external faults. 'is is achieved by detecting the remote circuit breaker operation (RCBO). 'e locus of power remains predominantly within regions 1 or 2, with occasional transfers between these regions due to internal faults prior to and following the RCBO. Conversely, in the case of external faults, regions 3 or 4 are implicated. 'is distinct variation in the locus of power is applied to derive the protection algorithm. 'is is a5rmed through sequence network analysis of various faults in the transmission line. 'e cumulative rate of change in relative reactive power has been employed for single-phase RCBO detection. 'e proposed protection logic employs supplementary undervoltage logic to avoid single-phase operation during two-phase and three-phase faults. 'e simulations are conducted with meticulous consideration of key factors, such as fault type, fault resistance, fault location, fault inception angle, and power source angle. Simulation results demonstrate the e0ectiveness of the proposed protection scheme.
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