Turbo-Generator
Off-line Testing

Wedge Tightness Detector -- Model WTD 501™
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The WTD-501 instrument is an improved version of the original WTD-123. Generator testing with the WTD-501 instrument quickly and objectively measures the relative tightness of all stator wedges in a machine. The redesigned probe is small, light and adjustable to fit most rotating machines, regardless of slot size or depth.

Stator Wedge Tightness Detector
Features
  • Accurate, reliable and consistent results assist in maintenance decisions to be reached
  • Objective electronic analysis removes subjectivity of hand tapping
  • Quick, easy collection and interpretation of data
  • Easy to operate, experienced personnel not required

Stator wedges were traditionally tested for tightness by tapping them with a hammer and listening to the sound produced. Electronic stator wedge tightness detection is faster, more accurate, provides more consistent results than hand tapping methods, and the test procedure is repeatable. The WTD Model 501 can be used to test all types of generators and motor stator wedges, including those with ripple springs.

Loose stator wedges may lead to vibration and erosion of stator insulation in electric generators. These serious problems can cause generator failure. The WTD acts as a sophisticated electronic ear that quickly and reliably provides an electronic map of wedge tightness.

The tightness of each wedge is compared to all other wedges in the winding, the wedges of another winding or an absolute external reference. A colored map showing the relative tightness of every wedge in the stator is produced and the data can be stored for trend analysis to determine when maintenance will be required.

ADWEL offers WTD testing services using the WTD-501 instrument as well as a complete training course on the use and operation of the WTD-501 instrument.