Chapter 1
Turbine Package System Overview
1-8
Turbine Instrumentation
Instrumentation is provided to monitor the turbine parameters and provide warning and trip
control functions.
Refer to the Turbine Instrumentation schematic diagram located in this Manual Volume.
Temperature Monitoring
Temperature detectors (RTD1 and RTD48) mounted in the air inlet casing, and thermocouples
(TC1 to TC13 inclusive), mounted in the gas generator exhaust outlet, monitor compressor
turbine operating temperature and temperature deviation. Additionally the output thermocouples
monitor combustion condition and will shut the turbine down in the event of flame out in one of
the combustion chambers. A further two thermocouples (TC101 and TC102) are mounted in the
exhaust ducting, downstream of the exhaust diffuser, as part of the turbine gas path
instrumentation for turbine control.
Thermocouples (TC17 and TC18), mounted in the Center Casing and Bearing Housing Assembly,
measure the compressor exit temperature.
Thermocouples (TC21 to TC28, and TC91, TC92, TC96 and TC227) positioned in the appropriate
bearings, measure journal and thrust bearing temperatures.
Speed monitoring
Speed probes (SD20 to SD23) are used for speed detection and overspeed protection in the gas
generator, and speed probes (SD24 to SD27) are used for speed control indication and
overspeed protection in the power turbine. Probes monitor from the gas generator rotor shaft
and power turbine rotor shaft.
Vibration Monitoring
X-Y non–contacting vibration probes (UD10X1 UD10Y1, UD11X1, UD11Y1, UD12X1, UD12Y1 and
UD13X1 UD13Y1) are provided adjacent to each rotor journal bearings, within the gas generator
and power turbine, to monitor radial vibration. Probes (UD10X2 UD10Y2, UD11X2 UD11Y2,
UD12X2 UD12Y2, UD13X2 and UD13Y2) are fitted as non–active spares.
Axial vibration detection probes (ZD10T1 and ZD10T2) are provided at the gas generator input
end thrust bearings.
Keyphasors (ND10K1 and ND12K1) are provided at the gas generator input end bearing and
power turbine output end bearing respectively, (ND10K2 and ND12K2) are fitted as non-active
spares.
Pressure Monitoring
Pressure transmitters are provided to facilitate engine control as follows:
•
Air inlet pressure (PT7).
•
Turbine compressor discharge pressure (PT8).
•
Interduct static pressure (PT258).
