The Heavy Load Voltage Schedule Action is issued during what condition?

The Heavy Load Voltage Schedule Action is issued during peak load periods. This is a critical time when the demand for electricity is at its highest, and it becomes necessary to maintain voltage levels within acceptable limits to ensure stability and reliability in the power system. During peak load periods, the transmission system can experience higher losses, and voltage may drop due to increased power flow. Issuing a Heavy Load Voltage Schedule helps mitigate these issues by adjusting the voltage levels accordingly and ensuring that the grid can efficiently handle the higher loads without risking equipment failure or service interruptions.

In contrast, low load periods do not typically warrant a Heavy Load Voltage Schedule, as the demand on the system is minimal and can often be managed without adjustments. Equipment maintenance usually follows pre-defined schedules, where voltage levels are maintained according to planned outages. Unexpected outages could lead to other types of operational actions, but they do not specifically align with the need for a Heavy Load Voltage Schedule, which is focused on managing peak demand scenarios.