A Protection Relay Testing job involves inspecting, calibrating, and testing protective relays used in electrical systems to ensure they operate correctly during faults or abnormal conditions. Technicians and engineers in this role perform diagnostic tests, evaluate relay settings, and verify system coordination to prevent power failures and equipment damage. They work with electromechanical, static, and digital relays in substations, power plants, and industrial facilities. The job requires knowledge of electrical protection schemes, testing procedures, and specialized testing equipment like secondary injection test sets. Proper testing ensures system reliability, safety, and compliance with industry standards.