E. Wiedenbrug

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Impulse testing has been an integral part of predictive maintenance of electrical motors for many years. The influence that extensive impulse testing has on a motor is investigated in this paper. The questions investigated are the following: can impulse testing damage healthy or deteriorated insulation? Can weak turn-to-turn insulation be diagnosed with DC(More)
On-line testing of motors, diagnostics and motor monitoring have shown large scientific development in the past few years, outgrowing the stage of RMS current and voltage measurements. This stems from current and voltage signature analysis which has progressed from the laboratory and the work of dedicated specialist experts to become the base for modern(More)
This paper discusses a new method to detect rotor eccentricity faults in induction motors using a so-called surge test that is applied to the stator windings. Rotor eccentricity faults cause an asymmetrical air gap in induction motors, which makes the surge waveform shape depend on rotor position. The change of surge waveform per revolution can be used to(More)
This paper presents very expensive impulse testing (also called surge testing) and turn insulation deterioration in electric motors. The tests include multiple start and stops under normal line conditions. The stresses introduced into the winding during startup and stopping process were two-fold. These stresses were the cause of the shorted turn-turn. The(More)
This paper investigates the effect of induction motor rotor eccentricity on the surge test data. It points out that rotor eccentricity makes surge waveform rotor-position dependent. In this way air gap abnormality can be seen clearly without the use of high-frequency data sampling and high-resolution spectral analysis, but still in a completely unobtrusive(More)
This paper describes the capabilities of a new facility that has been developed on the campus of Oregon State University by support from the Electric Power Research Institute (EPRI) and the Bonneville Power Administration (BPA). The purpose of the Motor Systems Resource Facility (MSRF) is to promote the effective and efficient use of electric motors, drives(More)
Short-circuit protection of electrical motors in explosive gas atmosphere, as in underground mines, is an important duty. Short-circuit currents of high magnitude may cause explosions and fire. But even the starting current of an induction motor is a multiple of nominal current. Consequently protection devices should have a high sensitivity to faults. This(More)
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