Wedge Tightness Detector

Modern Electronic Wedge Tightness Detector – (Model WTD 501™ )

Stator wedges are traditionally tested for tightness by tapping them with a hammer and listening to the sound produced. This method is slow and prone to inconsistency. Electronic wedge tightness evaluation is faster, more accurate and provides more consistent results.

A hand-held probe automatically taps and measures each wedge approximately 30 times in three seconds. An accelerometer gathers the data and transmits it to the WTD-501 instrument. Results are presented on a computer in the form of numeric values and a color-coded tightness map

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


The color-coded map makes it easy to identify suspect areas. Details are provided in a numeric tightness report. Operator may choose up to five ranking categories to classify wedge tightness.

WTD Brochure

Wedge Tightness Detector