how turning gear interlock works?

A turning gear interlock is a safety mechanism used in machinery, particularly in steam and gas turbines, to prevent the unintended rotation of the equipment during maintenance or inspection. It ensures that the turning gear, which is used to rotate the turbine for lubrication or cooling, cannot be engaged while the turbine is in operation or under certain unsafe conditions. The interlock typically involves mechanical or electrical locks that prevent simultaneous operation of the turbine and turning gear, ensuring the safety of maintenance personnel. By requiring specific conditions to be met before activation, the interlock helps to mitigate the risk of accidents.