Turbine Protective Device Test – Bearing Oil Pressure Low Trip Test

The Bearing Oil Pressure Low Trip Test is a crucial procedure conducted on rotating machinery, particularly on turbines, generators, or other equipment equipped with bearings that rely on lubricating oil systems. This test is designed to ensure that the system can detect and respond appropriately to low oil pressure conditions, which could potentially lead to bearing damage or other operational issues.

1. )   Place the test lever in the Test Position
2. )   Gradually open the test valve in the sensing line of the bearing oil pressure
3. )   Verify that the bearing oil pressure low alarm is annunciate first as oil pressure drops after opening the test valve to 0.75 bars. Observe the bearing oil pressure in the pressure indicator.
4. )   Verify that the bearing oil pressure low-low trip is initiated as oil pressure drops further to < 0.5 bars and turbine trip solenoid valve is energized releasing the trip test oil pressure. Observe the trip test oil pressure drops to 0 bar. Confirm that the auto stop oil pressure remains > 9 bars.
5. )   Close the test valve in the bearing oil pressure sensing line and observe that the oil pressure is build up to > 1 bar.