Apparatus for precise detection of blade passing times in a steam turbine

Patent · Tue May 08 04:00:00 EDT 1990

OSTI ID:7085844

Rozelle, P F; Koch, K C; Einolf, Jr, C W; Oates, R M

This patent describes an apparatus for detecting the passing times of the blades of a steam turbine past a stationary sensor for providing blade vibration data. It comprises: stationary magnetic sensor means for producing an input signal each time a blade of a steam turbine passes the sensor means; zero crossing detection means responsive to the input signal for producing an output signal each time the input signal crosses a reference axis; means responsive to the input signal for shifting the phase of the input signal; comparator means responsive to the phase shifted input signal and a reference signal for producing a gating signal whenever the phase shifted input signal exceeds the reference signal; and gate means responsive to the gating signal and the output signals for conducting those output signals which occur during the duration of the gating signal.

• Assignee: Westinghouse Electric Corp., Pittsburgh, PA
• Patent Number(s): US 4922757; A
• Application Number: PPN: US 7-205770A
• OSTI ID: 7085844
• Country of Publication: United States
• Language: English

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47 OTHER INSTRUMENTATION
DESIGN
MACHINERY
MAGNETIC FIELDS
MEASURING INSTRUMENTS
MECHANICAL VIBRATIONS
METERING
METERS
STEAM TURBINES
TURBINE BLADES
TURBINES
TURBOMACHINERY