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Until recently, vibration technology was the only means to assess many mechanical failures in the field. However, the motor and driven load is relatively inaccessible in industrial environments. Due... (View Full Article)
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When performing a surge or surge comparison test on three phase motors, you are evaluating the integrity of the coils inside the motor. There are certain motors that will, by design, show a mismatch... (View Full Article)
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This paper will discuss the root causes of electrical failures in motors and how high voltage testing can help in early detection. The paper will review the insulation resistance test, polarization... (View Full Article)
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Q: Why can my motor have a coil with a "hole blown in it" and still give a stable trace on a surge test? The Baker surge test works GREAT for detecting shorts, why not a blown open coil? A: There may... (View Full Article)
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Vane axial fans find frequent applications in nuclear environments. Their failure can result in unplanned outages, health and safety costs and extensive damage to supplementary equipment. The... (View Full Article)
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Surge testing of motor coils has been an industry practice since J. L. Rylander published "A High Frequency Voltage Test for Insulation of Rotating Electrical Apparatus" in Transactions of the AIEE,... (View Full Article)
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The objective of this paper is to describe conceptually how the Explorer calculates the operating speed of an induction motor. This calculation is disclosed in [3], and is significantly more involved... (View Full Article)
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This I-Presentation is a short introduction to a new technique that will offer users of high voltage test equipment that have motors with high impedance to view better qualified information about DC... (View Full Article)
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Impulse testing is an integral part of predictive maintenance of electrical motors. Through the following questions the influence that extensive impulse testing has on a motor is investigated. Can... (View Full Article)
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On-line testing of motors, diagnostics and motor monitoring have shown large scientific development in the past few years. Current and voltage signature analysis have increased the quality of... (View Full Article)
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A motor supplying compressed air in a smelting plant fails, a motor necessary to pump petroleum products goes offline in a petrochemical plant, a motor essential to the operation of the number one... (View Full Article)
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Predictive Maintenance has become a highly technical and diverse field requiring both state-of-the-art equipment and skillfully trained and aggressive reliability engineers. Online, (dynamic), motor... (View Full Article)
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Predictive Maintenance professionals typically don't have the luxury of owning their variable frequency drive (VFD) vendor's software that identifies many of the motor-load fault mechanisms. The... (View Full Article)
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Modern Plant Management widely accepts predictive maintenance as a significant source of cost savings. However, preventive maintenance is still viewed as an alternative. This fact is based upon... (View Full Article)
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Consider a large several 1000hp motor with an operating voltage of 4160V. Motors of this size can have inductance on the order of Henrys, depending on specifics of the windings in the motor. The... (View Full Article)
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There has been much said about the effectiveness of the surge test that has been taken for granted by our industry. The notion that "all the surge voltage" appears across the first turn is one of... (View Full Article)
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We are all very aware of the advantages and the cost savings of using predictive maintenance technologies. The Surge test has always fallen into a go and no go test. With the updated AWA software, the... (View Full Article)