Prober for testing generator stator wedge tightness with rotor in place
First Claim
1. Apparatus for measuring the tightness of stator wedges held in place by ripple springs in an electric generator having a rotor and a stator separated by a narrow radial gap without removing the rotor, where selected of said stator wedges have a series of longitudinally spaced holes through which the ripple springs are accessible, said apparatus comprising:
- a low profile carriage insertable in said narrow gap between the rotor and stator and successively positionable adjacent each hole in said series of holes through said selected stator wedges;
a probe;
probe mounting means mounting said probe on said low profile carriage and selectively extending said probe through an adjacent hole in said selected wedges and into contact with said ripple springs; and
means measuring the extension of said probe.
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0 Petitions
Accused Products
Abstract
Apparatus for measuring ripple spring deflection to determine stator wedge tightness in an electric generator without removing the rotor includes a low profile carriage insertable in the gap between the rotor and stator. A probe is aligned longitudinally and laterally with holes in the stator wedges with the aid of a miniature television camera on the carriage and extended through an aligned hole to contact the ripple spring. The probe is connected through a cable to the core of a linear variable differential transformer mounted on the carriage which provides an accurate measurement of probe extension. The probe is extended and retracted by an arrangement of cables and springs providing a lost motion coupling which accommodates for seating of the probe against a ripple spring at less than full extension.
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Citations
22 Claims
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1. Apparatus for measuring the tightness of stator wedges held in place by ripple springs in an electric generator having a rotor and a stator separated by a narrow radial gap without removing the rotor, where selected of said stator wedges have a series of longitudinally spaced holes through which the ripple springs are accessible, said apparatus comprising:
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a low profile carriage insertable in said narrow gap between the rotor and stator and successively positionable adjacent each hole in said series of holes through said selected stator wedges; a probe; probe mounting means mounting said probe on said low profile carriage and selectively extending said probe through an adjacent hole in said selected wedges and into contact with said ripple springs; and means measuring the extension of said probe. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. Apparatus for measuring the tightness of stator wedges held in place by ripple springs in an electric generator having a rotor and stator separated by a narrow radial gap without removing the rotor where selected of said stator wedges have a series of longitudinally spaced holes through which the ripple springs are accessible, said apparatus comprising:
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a low profile carriage insertable in said narrow radial gap between the rotor and stator and successively positionable adjacent each hole in said series of holes through said selected stator wedges; a tray mounted on said low profile carriage for movement generally toward and away from an adjacent stator wedge; reference setting means setting the distance between said tray and the adjacent stator wedge to a preselected reference distance; a platform; means mounting the platform on said tray for movement with said tray to said preselected reference distance between the tray and the adjacent stator wedge, and for movement laterally with respect to said tray; a probe; probe mounting means mounting said probe on said platform and selectively extending said probe through an adjacent hole in said selected stator wedges and into contact with said ripple springs; and measuring means measuring the extension of said probe when in contact with said ripple springs. - View Dependent Claims (19, 20, 21, 22)
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Specification