In a mechanical-hydraulic governor system, what is the purpose of the auxiliary oil pump?

In a mechanical-hydraulic governor system, the auxiliary oil pump is primarily responsible for providing oil pressure during the start-up of the turbine. This is a crucial function because, during start-up, the main pump may not yet be providing adequate pressure or may not be operational until the turbine reaches a certain speed. The auxiliary oil pump ensures that there is sufficient lubrication and hydraulic pressure available at this critical phase, allowing the governor system to effectively control turbine speed and performance right from the moment it begins operation. This capability helps prevent possible damage due to insufficient lubrication and assures the proper functioning of control mechanisms that manage the turbine’s operation.