The document presents an analysis of asymmetrical faults in 220/400 kV transmission lines using fast Fourier transform (FFT), detailing the occurrence and characteristics of symmetrical and asymmetrical faults. It emphasizes the importance of numerical relays for enhancing reliability in power systems, enabling better fault detection and diagnosis, particularly for line-to-ground and line-to-line-ground faults. The study concludes with FFT analysis results indicating significant changes in current and voltage parameters during faults, which are critical for effective fault management in electrical power systems.