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Abstract
In any of the industry flashovers in electrical system is quite often and generally handled casually. But when any of the vulnerable auxiliary or MCC become out of service on account of loose connection, it is difficult to handle the situation as the emergency systems of the process industry gets locked which simultaneously may be associated with huge revenue loss. All attempt should be made to minimize such electrical flashovers by adopting suitable technical measures. © 2018, Central Board of Irrigation and Power. All rights reserved.
... When analyzing electrical failures, it is revealed that about 20 to 25% of the total failures are the result of connection failures due to poor terminations and loose connections. In general, poor terminations / loose connections in the electrical system cause overheating of these connections which in turn leads to equipment failure [2]. This means that the main symptoms of damage to machinery and equipment can be indicated by the increase in temperature of the equipment. ...
The use of electrical energy in the industrial is very important to drive production machines. Machine maintenance is carried out so that the lifetime of the machine becomes longer so that the production process continues. Temperature is one of the most common indicators of the structural health of equipment and components. This means that the main symptoms of damage to machines and equipment can be indicated by increasing the temperature of the equipment. One of the symptoms of an increase in equipment temperature is due to a loose cable termination. The use of infrared thermography to measure the temperature rise due to loose termination is one of the methods in electrical machine maintenance. Previous studies using infrared thermography to measure the temperature rise due to loose termination have been carried out by many researchers, but these studies did not show a correlation between the level of loose termination and the increase in temperature but only stated that the loose termination caused an increase in temperature. This study focuses on finding the relationship between the level of loose termination compared to standard torque and the increase in temperature at the termination point. This is very useful as a quick overview in determining the level of urgency in maintenance activity, that percentage of loose termination of a certain value below the standard will give an increase in temperature of a certain value as well. This study resulted, for the torque setting condition 67% below the standard (loose) the temperature increase at the terminal was 13.4% - 15.6%, for the torque setting condition 33% below the standard temperature increase at the terminal of 12.3% -13.8% which mean that the increase in temperature is directly proportional to the level of slack termination and is also directly proportional to the increase in the motor speed. If the termination torque level is lower and the motor speed is increased, the terminal temperature rise will be drastically rise.
... Electric cables and other electrical appliances designed to carry the rated currents can dissipate any heat generated at the joints. In condition of weak connection, the heat generated at this joint is more than the dissipation capacity of the cable; hence resulting in temperature increment of the cable (Gore and Gore, 2018). Zhou and Schoepf (2011) reported that overheated electrical joints caused by loose cable connection are often the forerunners of electric fires, arc faults and arc flash in electrical systems. ...
Electricity is the prime mover of every economy; hence there is a need to maintain its generation, distribution and consumption. This study was carried out to appraise the status of electrical wiring in the Isoko area of Delta State, Nigeria. A total of 300 residential buildings, 200 makeshift shops and 100 artisan workshops were sampled and their structures, state of connection, overvoltage protection (cut-out fuse) and earthing were accessed. 100 questionnaires were distributed to electricians involved in electrical wiring and installations in the study area. Results obtained from the questionnaires revealed that only 71% of the residential buildings, 23% of the makeshift shops, and 8% of the artisan workshops made use of electric cables that met the NIS recommendations. For electric cable connections, it was observed that there was a lapse in the connections; mostly in the artisan workshops, as some service cables were not properly tightened to the distribution lines. Only 75% of the residential buildings, 53% of the makeshift shops, and 5% of the artisan workshops had approved rating cut-out fuse. It was observed that in artisan workshops, welding machines were connected directly to the service lines. Furthermore, the results revealed that 42% of the residential buildings, 87% of the makeshift shops and 99% of the artisan’s workshops lacked proper earthing. These results revealed electrical risks in many makeshift shops and artisan workshops and the need for the relevant authorities to act fast to minimize power outrage and prevent electrical tragedies in the study area. Keywords: Artisan, electrical wiring, energy theft, makeshift shops, residential buildings
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