What is the purpose of disconnect switches within a power system?

Disconnect switches play a crucial role in ensuring safety during maintenance activities within a power system. Their primary purpose is to provide a means of isolating sections of the electrical network from the power supply, thereby allowing maintenance personnel to safely work on the equipment without the risk of electric shock or accidental re-energization. When the disconnect switch is open, it physically disconnects the power source from the equipment or circuit being serviced, ensuring that it is de-energized.

In contrast to the other options, disconnect switches are not primarily designed to prevent overload, control voltage levels, or manage reactive power. While these functions are vital within a power system and often involve different equipment such as circuit breakers or voltage regulators, the specific and essential function of disconnect switches is related to providing safe isolation which is critical for maintenance work. This functional clarity underscores the importance of understanding the correct application of different devices within electrical systems for both safety and operational effectiveness.