Stator bar jacking device for measuring radial movement of stator bar using an LVDT
First Claim
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1. A barjacking test unit for measuring radial movement of generator stator bars in-situ, the barjacking test unit comprising:
- a linear voltage displacement transducer (LVDT) secured to a frame, the LVDT including a spring biased displacement measuring arm;
a bar sensor engageable at an exterior end with a stator bar; and
a pivot bracket pivotally secured to the frame and disposed between an interior end of the bar sensor and the spring biased displacement measuring arm of the LVDT, wherein the spring biased displacement measuring arm urges the bar sensor toward engagement with the stator bar via the pivot bracket.
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Abstract
A pneumatic jacking device is used to measure radial movement of stator bars in their slots while the generator is in-situ. The jacking device is designed to pass through the radial gap between the field retaining ring and stator end winding, requiring a minimum entrance gap of 2.625". The device is placed between the retaining ring and the stator bar, and radial movement is measured by the application of a force such as by a pneumatic ram or the like. Radial movement is measured by a linear voltage displacement transducer and is transmitted to a measuring unit for further processing.
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Citations
9 Claims
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1. A barjacking test unit for measuring radial movement of generator stator bars in-situ, the barjacking test unit comprising:
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a linear voltage displacement transducer (LVDT) secured to a frame, the LVDT including a spring biased displacement measuring arm; a bar sensor engageable at an exterior end with a stator bar; and a pivot bracket pivotally secured to the frame and disposed between an interior end of the bar sensor and the spring biased displacement measuring arm of the LVDT, wherein the spring biased displacement measuring arm urges the bar sensor toward engagement with the stator bar via the pivot bracket. - View Dependent Claims (2)
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3. A barjacking crawler for measuring radial movement of generator stator bars in-situ, the barjacking crawler comprising:
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a barjacking assembly insertable into a radial gap between a field retaining ring and a stator end winding of a generator; a barjacking test head attached to the jacking assembly; and a barjacking test unit cooperatively engaged with the barjacking test head, the barjacking test unit comprising; a linear voltage displacement transducer (LVDT) secured to a frame, the LVDT including a spring biased displacement measuring arm, a bar sensor engageable at an exterior end with a stator bar, and a pivot bracket pivotally secured to the frame and disposed between an interior end of the bar sensor and the spring biased displacement measuring arm of the LVDT, wherein the spring biased displacement measuring arm urges the bar sensor toward engagement with the stator bar via the pivot bracket. - View Dependent Claims (4, 5, 6, 7, 8, 9)
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Specification