Operating turbine resonant blade monitor
First Claim
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1. An apparatus to provide torsional excitation to a rotor of a turbine-generator at a predetermined frequency, said rotor having a plurality of turbine blades extending radially therefrom, the apparatus comprising:
- an exciter coupled to a field winding of said turbine-generator to provide amplitude modulation of a current in said field winding and thereby impart a torsional excitation to said rotor at said predetermined frequency,whereby turbine blades which vibrate resonantly at said predetermined frequency can be distinguished.
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Abstract
An operating turbine monitor is described incorporating one or more acoustic sensors positioned next to a blade row of a rotor, an analog digital converter, a tachometer sensor at the rotor shaft, a memory, a synchronous averaging circuit, a subtractor circuit, and a comparator. The invention overcomes the problem of monitoring an operating turbine of order-related turbine blade vibration and for non order-related turbine blade vibration as well as for other turbine conditions.
55 Citations
11 Claims
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1. An apparatus to provide torsional excitation to a rotor of a turbine-generator at a predetermined frequency, said rotor having a plurality of turbine blades extending radially therefrom, the apparatus comprising:
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an exciter coupled to a field winding of said turbine-generator to provide amplitude modulation of a current in said field winding and thereby impart a torsional excitation to said rotor at said predetermined frequency, whereby turbine blades which vibrate resonantly at said predetermined frequency can be distinguished. - View Dependent Claims (3, 4)
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2. A method to provide torsional excitation to a rotor of a turbine-generator at a predetermined frequency, said rotor having a plurality of turbine blades extending radially therefrom, the method comprising the steps of:
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coupling an exciter to a field winding of said turbine-generator to provide amplitude modulation of a current in said field winding; operating said exciter to provide torsional excitation of said rotor at said predetermined frequency by modulating the current in said field winding, said predetermined frequency causing a resonant vibration of a portion of said turbine blades; indicating said portion of turbine blades which are resonant at said predetermined frequency. - View Dependent Claims (5, 6)
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7. An apparatus to impart a resonant torsional vibration to a rotor of a turbine-generator, said rotor having a plurality of turbine blades extending radially therefrom, the apparatus comprising:
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an exciter coupled to a field winding of said turbine-generator for providing amplitude modulation of a current in said field winding to induce a resonant torsional vibration in said rotor; whereby a resulting vibration in said turbine blades may be monitored to confirm that said rotor is vibrating resonantly. - View Dependent Claims (8, 9)
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10. A method for imparting a resonant torsional vibration to a rotor of a turbine-generator, said rotor having a plurality of turbine blades extending radially therefrom, the method comprising the steps of:
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coupling an exciter to a field winding of said turbine-generator; operating said exciter to provide amplitude modulation of the current in said field winding to induce a resonant torsional vibration in said rotor; and monitoring a resulting vibration in said turbine blades to confirm that said rotor is vibrating resonantly. - View Dependent Claims (11)
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Specification