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An important position measurement in Turbine Supervisory Instrumentation (Tsi) is case expansion. Case expansion(sometimes referred to as shell expansion) is the thermalgrowth of the machine case as it expands during machinestartup and on-line operations. The case expansiontransducer system is typically mounted on the foundation atthe opposite end from where the turbine casing is attachedto the foundation and provides information about the growthof the machine case relative to the foundation.

Case expansion is a parameter that you should use a dualtransducer arrangement to measure. This arrangementprovides information about the position of the sliding feet onthe machine case. A condition that obstructs or jams onefoot could distort the case and damage the machine. Thedual case expansion transducer configuration in conjunctionwith the 3300 or 3500 monitors provides an alarm for thiscondition. The high temperature dual case expansion transducer configuration is compatible only with the 3500/45Position Monitor.

Frequently Asked Questions

What exactly does the model number "24765-02-01" represent?

It breaks down into three parts: 24765 is the base model for the DC LVDT Case Expansion Transducer System; -02 specifies a linear measurement range of 50.8 mm (2.0 inches); -01 indicates it is equipped with a Spring Return mechanism.

Where is the 24765-02-01 typically installed on a turbine?

It is mounted on the foundation (or a stable structural beam) at the "sliding foot" or the governor end of the turbine casing to measure relative thermal expansion.

What type of output signal does the 24765-02-01 generate?

It provides a negative DC voltage output that varies linearly relative to the displacement of the sensor's rod.

What is the operating temperature range for the 24765-02-01?

The sensor operating temperature range is -40°C to +100°C (-40°F to +212°F),making it suitable for harsh environments near turbine shells.

Product Applications

Thermal power plants: Used for thermal expansion monitoring and measurement of cylinders (casings) in large steam turbine units (TSI system) to prevent friction caused by uneven thermal expansion between the casing and rotor.

Nuclear power plants: Used for mechanical condition and displacement monitoring of conventional islands and related large turbine equipment. 

Petrochemical and metallurgical industries: Applied to displacement and thermal expansion protection of critical drive equipment such as large compressors and industrial turbines.