trip isolation valve assembly operates, the HP protection oil drains, the steam inletvalves close quickly and the steam admission to the unit is shut off.5.3.2.3.7 Low lube oil pressure breaker: see Fig. 1-95.3.2.3.7.1 The system is composed of 8 pressure switches, 3 pressure transmitter, 3throttling orifices, 3 test solenoid valves and accessories.5.3.2.3.7.2 The pressure switch PSA1 detects the drive oil pressure in oil turbine, when the oilpressure drops to 1.205MPa, the auxiliary oil pump (TOP) starts up.5.3.2.3.7.3 The pressure switch PSA2 detects the oil inlet pressure in main oil pump, when theoil pressure drops to 0.07MPa, the suction pump (MSP) starts up.5.3.2.3.7.4 The pressure switch PSA3 detects the oil pressure in lube oil mains, when the oilpressure drops to 0.105MPa, the DC emergency oil pump (EOP) starts up.5.3.2.3.7.5 The pressure switch PSA4 detects the oil pressure in lube oil mains, when the oilpressure drops to 0.115MPa, the oil pressure low alarm signal will give out and theauxiliary oil pump (TOP) starts up.5.3.2.3.7.6 The pressure switch PSA5 detects the oil pressure in lube oil mains, when the oilpressure drops to 0.03MPa, the turning stops.5.3.2.3.7.7 The pressure switch PSA6~PSA8 detects the oil pressure in lube oil mains, whenthe oil pressure drops to 0.07MPa, a signal is transmitted to ETS, and the steamturbine will be tripped after two-out-of-three logic processing.5.3.2.3.7.8 The pressure transmitters Pt1~Pt3 detect the main oil pump outlet pressure andlube oil pressure respectively.5.3.2.3.7.9 The three throttling orifices and three solenoid valves can be used to perform theon-line test of AC auxiliary oil pump (TOP), suction pump (MSP), and DCemergency oil pump (EOP) respectively.
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