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Peden, whose company services utilities including water


and wastewater treatment plants, as well as municipal, com- mercial and industrial pumping equipment, decided on the latter, investing in a powerful portable winding analyzer and motor tester. Not only was the price in the lower range, but also the system was user-friendly and easy enough to use that highly trained specialists are not needed to operate it.


Living Up to Customer Guarantees “We’re a motor shop, which means we clean motors and


install or service windings,” Peden said. “We use an electronic analyzer to test the integrity of the motor windings, to ensure that they are going to provide our customers with dependable performance.” Te motors Alliance Pump and Mechanical service have


sometimes been subjected to harsh conditions, including excessive heat, debris, or occasional lightning strikes, all of which mean that windings have to be replaced. When a dam- aged or simply worn-out pump and motor assembly arrives at the shop, Alliance technicians disassemble and thoroughly inspect the motor. Te windings are then cleaned, baked and surge tested to make sure they are good. “We have to be certain that the windings are good or six


months later a motor could fail, and due to the comprehensive warranty we provide, we’d end up eating the cost of repairing the unit,” Peden explained. Peden said it takes a good analyzer to do a thorough


test on the windings to make sure that the integrity of the motor windings is good. “I looked at several different models, and decided that the iTIG II looked like a pretty user-friendly unit that performed all of the tests and reports that we needed.” Te iTIG II is a winding analyzer and motor tester from


Electrom Instruments (Longmont, CO) that comes with various options and output ranges from 4 kV to 12 kV. By adding Power Packs one can go to even higher voltages. Peden added that using this analyzer and tester is like


an insurance policy. “Once we’ve run the analyzer and everything passes there


is no doubt that the motor is good. And it also assures the cus- tomer that we did comprehensive testing, and that everything checked out,” Peden said. “Aſter the testing the device gives us a printable report that we provide to our customer as docu- mentation of what we found. It’s part of the procedure we follow in motor repair.”


Power Plant Applications Clark Myers, an electrician at Twin Oaks Power LP (Bre-


mond, TX), a division of Optim Energy LLC, has been using Electrom winding analyzers for several years at the coal-fired power generation plant. Te Electrom testers use high-frequency 60-Hz surge


pulses, eliminating ionization dissipation and thus better simulating what motors are subject to during operation. “Tis is really the only testing and analyzing device we use


for checking motors,” Myers said. “We also use it on the back of switchgear to ensure proper protection of the motor and the line. Typically this testing is done during a scheduled outage.” Myers, a 35-year veteran of power plant construction and


operation, added that the iTIG is quite user-friendly and does not require engineering expertise or extensive training to operate it successfully. “I’m not what you would call an expert as far as instrumen-


tation is concerned,” he said. “Tis particular instrument is pretty straightforward. Basically, the company just showed us how to use the device, and ever since it has been pretty much second nature.”


Friendly but Powerful One of the big advantages of some of today’s most ad-


vanced instruments is that they are both easy to operate and interpret, but also contain powerful features. Te iTIG II that Alliance Pump and Mechanical purchased


gives users the ability to perform a variety of tests from the most simple low-resistance tests to Megohm (also called insu- lation resistance), hipot and advanced surge testing. One of the key advantages of all iTIG models is that they


use a 60-Hz surge pulse frequency, the same frequency at which most motors operate. Tis high pulse rate provides a sufficient frequency to overcome ionization dissipation and can thus isolate insulation weaknesses with more sensitivity, predicting future faults before low-frequency testers, and also better simulates motor operating conditions. One of the most significant ease-of-use features is that the


iTIG II enables users to enter the surge test voltage, push a button, and let the machine run the test independently. Surge waveform ranges are automatically set for all models, which eliminates the need to specify configurations, to push multiple buttons, or to turn dials. All tests can be done with one instrument; they are available


in manual to fully automatic models. No additional items are required other than accessories, which can be added on at any time. Tests that can be performed on this system include surge comparison, DC hipot, step voltage, insulation resistance (Meg test), dielectric absorption (DAR), polarization index (PI), low resistance (Ohms), impedance (Z), phase angle, Induc- tance (L), and capacitance (C). Models have different features included and all can be upgraded to any higher-level model. Electrom Instruments started manufacturing surge testers


in the 1980s and produced the first digital winding analyzer in the early ’90s.


Edited by Yearbook Editor James D. Sawyer from material provided by Electrom Instruments.


Energy Manufacturing 2014 73


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