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WEDGE TIGHTNESS DETECTION THROUGH STRAIN GAGES

IP.com Disclosure Number: IPCOM000238559D
Publication Date: 2014-Sep-03
Document File: 4 page(s) / 167K

Publishing Venue

The IP.com Prior Art Database

Abstract

The present invention proposes a technique to monitor tightness of a stator wedge. The technique includes a wedge design with slight alternation to part geometry or manufacture the structure of the wedge to monitor tightness of the stator wedge. The technique provides testing the generator wedge without degassing and end shield removal. Utilization of the current wedge slot design with the modified wedge equipped with a strain gage provides minimal modification to stator core. The technique includes several embodiments to monitor tightness of the stator wedge.

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WEDGE TIGHTNESS DETECTION THROUGH STRAIN GAGES

BACKGROUND

The present invention relates generally to a stator wedge and more particularly to a technique for detecting tightness of the stator wedge.

Usually, removing parts or disassembly of a system requires monitoring of tightness of a stator wedge within the system. Removing the parts disrupts plant operation and results in power plant outages extension to complete the inspection. At the time of outage, loose or bad wedge results into delay for the system to be online, as this requires waiting for parts and labor.

A conventional technique includes an apparatus for evaluating stator wedge tightness of an electric alternator. However, the conventional technique requires opening the generator to deduce tightness.

Another conventional technique includes removal of an end shield for a crawler to be placed into the machine to measure the wedge tightness.

One other conventional technique includes utilization of a harness tester, which requires field to be removed and requires three weeks for completion.

However, the conventional techniques require long time to monitor tightness of the wedge and prepare the system to be online.

It would be desirable to have an efficient technique to monitor tightness of the wedge without opening the generator.

BRIEF DESCRIPTION OF THE DRAWING

Figure 1 depicts the wedge with a slight bow in the middle.

Figure 2 depicts the wedge manufactured with the curve.

Figure 3 depicts the components required to monitor tightness.

DETAILED DESCRIPTION

The present invention proposes a technique to monitor tightness of a stator wedge. The technique includes a wedge design with slight alternation to part geometry or manufacturing structure of the wedge to monitor tightness of the stator wedge. The technique provides testing generator wedge without degassing and end shield removal. Utilization of the conventional wedge slot design with the modified wedge equipped with strain gages provides minimal modification to stator core. The technique includes several embodiments to monitor tightness of the stator wedge.

In an embodiment of the invention, relief is cut into side of the wedge to allow slight deflection. A slide utilized on the wedge has a slight bow in the middle. Figure 1 depicts the wedge with a slight bow in the middle.

Figure 1

When the slide is forced under the wedge, the surface is placed under tension or compression depending upon which way the gage is mounted. At the time of manufacture, the strain is measured. Once a generator is online...