Experimental investigation of insulation resistance for turbo generator digital protection
1 Mechanical and Mechatronics Engineering Department, Afe Babalola University, P.M.B., 5454, Ado-Ekiti Nigeria.
2 Department of Electrical/Avionics Engineering, Air Force Institute of Technology Kaduna, Nigeria.
Research Article
Global Journal of Engineering and Technology Advances, 2020, 05(02), 030-037.
Article DOI: 10.30574/gjeta.2020.5.2.0096
Publication history:
Received on 10 November 2020; revised on 21 November 2020; accepted on 25 November 2020
Abstract:
Insulation of all electrical machinery is practically in the form of organic compounds that contain water as part of their make-up. Excessive temperature tends to dehydrate and oxidize the insulation and make it become brittle and disintegrate under vibration and shock. The insulation lifespan of turbo generators deteriorates slowly at low temperatures and more rapidly at high temperature. Economic factors, such as initial cost, replacement cost, obsolescence, and maintenance, are of prime importance when determining the years of useful service desired for the electrical insulation. Generator digital protection- fault diagnosis test was carried out to find out the cause of insulation breakdown on the turbo generator unit 411G3. The experimental procedure consists of an insulation resistance test, meggering (time-resistance absorption test), and pendulum over-speed test. A thorough investigation was conducted to identify all the stator bars that constituted the Red phase and other connections. Voltage drops on these stator bars were measured and values were used to detect ground faults which were rectified via an intelligent protection scheme.
Keywords:
IR Testing; Meggering; Phasor Data; Polarization Index; Thermal Insulation.
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Copyright © 2020 Author(s) retain the copyright of this article. This article is published under the terms of the Creative Commons Attribution Liscense 4.0