In the context of substations, what does it mean to "connect or disconnect lines or equipment"?

To "connect or disconnect lines or equipment" refers to the operation of switchgear, which is essential for managing the flow of electricity within substations. Switchgear includes various components like circuit breakers, switches, and disconnectors that are used to make or break electrical circuits safely. This operation is crucial for controlling power distribution, performing maintenance, and ensuring the safety of personnel and equipment.

In substations, effectively connecting or disconnecting lines allows for the isolation of certain sections of power lines or equipment, which is necessary during maintenance, in emergencies, or when rerouting power as needed. Understanding how to operate switchgear is vital for substation technicians, as it directly impacts the reliability and safety of the electrical system.

The other options, while related to the functions of a substation, do not specifically pertain to the act of connecting or disconnecting equipment. The installation of new circuits relates more to establishing a network rather than isolating existing equipment. Measurement of electrical parameters involves diagnostics and monitoring, which is not directly connected to switching operations. Security monitoring focuses on the safety and protection of the substation, not on the physical or operational aspects of connecting or disconnecting equipment.