Which combination of factors is crucial for the successful integration of protection relays?

The successful integration of protection relays hinges significantly on settings definition and scenario simulation, as these factors are essential for ensuring that relays function correctly within the specific electrical system they are protecting.

Defining the settings involves calibrating the relays to the unique electrical characteristics and protection requirements of the system. Proper settings ensure that relays accurately detect faults and respond appropriately, which is crucial for maintaining system reliability and safety.

Scenario simulation complements the settings by allowing engineers to test how the relays will perform under various operating conditions and fault scenarios. This proactive approach facilitates the identification of potential issues before they occur in the field, thereby enhancing the reliability of the protection systems.

The other choices do not encompass the broader requirements necessary for successful integration. While convenience and cost may be practical concerns, they do not directly contribute to the functionality and reliability of protection relays. Relying solely on hardware upgrades overlooks the critical aspects of configuration and testing required for effective protection. Lastly, eliminating the need for analysis undermines the foundation of effective relay integration, as continuous evaluation and analysis of settings and performance are vital in adapting to system changes and ensuring long-term effectiveness.