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Online partial discharge detection techniques and condition monitoring strategy for rotation machines

Kante, Naveen Chandra (2012). Online partial discharge detection techniques and condition monitoring strategy for rotation machines. Master of Engineering Thesis, Charles Darwin University.

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Author Kante, Naveen Chandra
Title Online partial discharge detection techniques and condition monitoring strategy for rotation machines
Institution Charles Darwin University
Publication Date 2012
Thesis Type Master of Engineering
Supervisor Debnath, Kamal K.
Abstract Partial Discharge is the physical phenomenon where localized electric discharges are seen within insulation system. They are confined to specific areas like voids and cavities of insulation material and thus they only bridge the electrodes partially. Partial discharge is a symptom of large number of problems in insulation of different electrical equipment caused by electrical, thermal, mechanical and chemical stresses. These may occur at the time of fabrication or as a result of aging. They can also be associated to surface discharges, which occur on the boundary of different insulation material. They can also be related to corona discharges in gaseous dielectrics.

Partial discharges can be seen in all the electrical equipment such as rotating machines, transformers, cables, switchgear, bus bars etc.; in low, medium and high voltage conditions. But this paper entirely deals with insulation material of windings in rotating machines. The voltage difference between the two major components of rotating machines, stator and rotor, can be thousands of volts.Hence insulation is used to separate them. Although insulation is necessary for isolation, it has no functional purpose in the generation of electricity. And insulation, though inherently reliable, is the weakest material and ages very quickly. Partial discharge is likely the main reason for deterioration of insulation.

As the partial discharge is known problem for a long time there are a different methods to detect it. When a partial discharge occurs it exhibits some physical features such as release of light, electromagnetic waves, acoustic waves and chemical reactions. The earlier detections included listening and observing the arc. But they are highly unreliable. At present there are many detection techniques such as online, offline, periodic, continuous etc.; and equipment ranges from handheld devices to large setups. The online technique which uses coupled capacitors is unique and needs assessment and analysis. Hence this paper presents detailed study of different failure mechanisms of insulation, effect of partial discharge, online techniques for partial discharge detection and finally a condition monitoring strategy for rotation machines.
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Created: Thu, 24 Aug 2017, 13:23:20 CST by Jessie Ng