What is the primary purpose of storage battery systems in relation to protective devices?

The primary purpose of storage battery systems in relation to protective devices is to provide a source of primary DC power. Protective devices within electrical systems, such as circuit breakers and relays, require a reliable power source to maintain their functionality, especially during disruptions or failures in the main utility power supply. Storage batteries supply the essential DC power that these devices need to operate and perform their protective functions.

When the primary AC power supply is not available, storage batteries ensure that these critical devices can still function, allowing them to monitor the system and react to fault conditions without interruption. This capability helps to protect equipment and maintain safety in the electrical system, as it allows for continued operation and monitoring of protective devices, even in adverse conditions.

While backup supply during outages may be relevant, it specifically emphasizes the function of maintaining operational status rather than solely providing power. Thus, the key aspect of storage battery systems is their role in supplying continuous, reliable DC power to protective devices to ensure the integrity and safety of electrical installations.