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Stator slot wedge testing

Electrical Insulating Material. Coated Cloth Products. Insulating Compounds. Insulation Paper and Film. Rigid Laminate. Offering the best in stator wedges, rotor wedges, armature wedges, formed slot wedges and liners, magnetic wedges, and rotor pole collars. slot liner, wedge and phase insulation for both manual and automatic insertion. Stator Wedge Analysis Loose stator wedges can lead to coil vibration and erosion of stator insulation. Iris Power stator wedge tightness testing provides a consistent and quantitative means of identifying the location and severity of loose stator wedges in order to plan rewedging or other necessary repairs. Method and apparatus for measuring the tightness of generator stator slot wedges and ripple springs with the rotor still in place. A wedge block having a hydraulic cylinder disposed therein is installed within the upper of a pair of parallel grooves in the stator slot. The hydraulic cylinder is activated to press down on a load plate, which in turn contacts a slot wedge within the other pair.

slot wedge for stator

The apparatus as recited in claim 1, wherein said means for displacing said slot wedge so as to compress said ripple spring comprises an hydraulic cylinder and a load plate, the load plate disposed between the wedge block and said slot wedge such that the hydraulic cylinder forces the load plate into contact with said slot wedge. Accordingly, particular arrangements disclosed are meant to be illustrative only and not limiting as to the scope of the invention which is to be given the full breadth of the appended claims and in any and all equivalents thereof. The apparatus as recited in claim 1, wherein said means for measuring the force required to compress said ripple spring comprises a load cell operably associated with said means for displacing said slot wedge so as to compress, said ripple spring. So it is significant to detect loose slot wedges in stator slots to ensure generatorpsilas normal operation. Once all measurements have been recorded and analyzed, the maximum height of the ripple spring and the load on the ripple spring can be determined. The wedge block 53 is inserted into the outer pair of grooves

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A new method for stator slot wedge testing of large generators

Do you want to read the rest of this article? For full functionality of ResearchGate it is necessary to enable JavaScript.

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Here are the instructions how to enable JavaScript in your web browser. When large generators become operational, the stator bars in the slots are subjected to the electromagnetic force during normal operation. After the generators have been operating for a long time, the electromagnetic force may cause the stator bars to vibrate due to the existence of loose stator slot wedges in large generators.

This leads to mechanical abrasion of the groundwall insulation and accelerates the deterioration of the generator, and can even cause generators to fail if the slot wedges are not treated. In order to ensure large generators continue working reliably, it is essential to detect loose slot wedges in the stator slots.

This paper describes the modeling of slot wedges with different fixing styles in large generators to study the process by which slot wedges become loose, and also presents an analysis of the looseness of slot wedges based on their vibration characteristics corresponding to the loosening process of the stator slot wedge. Moreover, a series of tests were performed with a nondestructive detection system developed based on this analysis to check the tightness of slot wedges in the laboratory.

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Details

The invention relates to electric generator stator coils and slot wedges, and more particularly to a method and apparatus for testing the deflection load of generator slot wedges and ripple springs.

In a large electric generator stator coils are retained in slots within the stator, the coils are in turn held in place by stator wedges. The stator wedges are inserted within a pair of opposed parallel grooves on either side of the stator slot. Ripple springs are inserted between the stator wedges and the coils to maintain a positive load on the coils to thereby maintain a consistent pressure or preload on the stator coil of the stator.

It is important to monitor the load on this ripple spring to insure that the pressure on the stator coil remains constant.

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Should the stator coils not be held to the proper tightness, insulation failure due to vibration caused by mechanical and magnetic loading can occur. There are various methods and apparatuses to test the tightness of stator wedges and ripple springs. One method is to measure the load on the stator coil's ripple spring by first drilling several holes along the length of the stator wedge. At each of these holes, the measurement of the height of the ripple spring is taken. Once all measurements have been recorded and analyzed, the maximum height of the ripple spring and the load on the ripple spring can be determined.

One drawback to this method is that for a typical generator having stator slots with three spaced wedges along each slot, each wedge having seven holes therein, ripple spring readings must be made and recorded. In this apparatus, a probe is inserted through the stator wedge holes and contacts the peak of the ripple spring. An apparatus on a carriage measures the extension of the probe which is successfully aligned with several holes in the stator wedge to determine the degree of compression of the spring.

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