Abstract
This paper presents a specific method to improve the reliability of the equipment and the quality of power supplied to the electrical systems with the frequency and voltage control of a thermoelectric plant, to guarantee a more stable system. The method has the novelty of combining Total Productive Maintenance (TPM) using only four pillars, with Electrical Predictive Maintenance based in failure analysis and diagnostic. It prevents voltage drops caused by excessive reactive consumption, thus guaranteeing the company a perfect functioning of its equipment and providing a longer life of them. The Maintenance Management Program (MMP) seeks to prevent failures from causing the equipment to be shut down from the electrical system, which means large financial losses, either by reducing billing or by paying fines to the regulatory agency, in addition to prejudice the reliability of the system. Using management tools, but applying only four TPM pillars, it was possible to achieve innovation in power plants with internal combustion engines. This study aims to provide maintenance with a more reliable process, through the implantation of measurement, control and diagnostic devices, thus allowing the management to reduce breakdown of plant equipment. Some results have been achieved after the implementation, such as reduction of annual maintenance cost, reduction of corrective maintenance, increase of MTBF (Mean Time between Failures) and reduction of MTTR (Mean Time to Repair) in all areas. Probabilistic models able to describe real processes in a more realistic way, and facilitate the optimization at maximum reliability or minimum costs are presented. Such results are reflected in more reliable and continual power generation.
Highlights
In the operation of power transmission systems, problems related to reactive voltage/power may occur at any time due to contingencies and/or changes in demand
The case study presented in this paper describes some corrective maintenance problems that were constantly occurring in the equipment of the “Mauá” power plant, in the quality of power supplied to the system, in the constant stopping of the generator due to the problem of contamination and in the corrective maintenance of vibration between generators and engines
All employees participating in the Total Productive Maintenance (TPM) Program should receive the Basic Training provided by the Pillar Coordinators
Summary
In the operation of power transmission systems, problems related to reactive voltage/power may occur at any time due to contingencies and/or changes in demand. Adequate control decisions are required over a relatively short period to improve the state of operation so as not to compromise the safety and reliability of the electrical system. Some of these situations may require solutions based on specific knowledge of the operators with the electrical system or equipment. This type of knowledge is obtained from practical operational experience gained over the years. Control decisions must be done by combining the experience of the operators with the solutions proposed by computational algorithms based on mathematical methods. Several systems are proposed in the literature to support voltage/reactive
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