Abstract Since the year 2000, Celeo Redes has been operating on the power transmission industry, and now has 12 Utilities, one of which is under construction, in 11 Brazilian States, totaling more than…
Summary This paper presents a fuzzy strategy for voltage control in power distribution systems. This control system will act on the tap changer of power transformers. Fuzzy system techniques have been use to…
Abstract On-line monitoring of the bushing conditions has been adopted by Tractebel for all the step-up transformers 550 kV at hydroelectric power plants (UHE) of Machadinho, Itá and Salto Santiago, with the purpose…
Summary With the purpose of increasing the operation reliability and optimization of transformer maintenance procedures, Eletronorte looks for implementing on-line monitoring systems for its substation assets. To do that, it is necessary to…
Summary With the purpose of assuring good supply of Electric Power to its 1.3 million customers spread on a 406,800 km2 area, ANDE - Administración Nacional de Electricidad, which is the company in…
Abstract The step-up transformers at the Euzébio Rocha Thermal Power Plant in Cubatão - SP [São Paulo] are key for the Brazilian national electric power supply. Due to their significance and to their…
Abstract Electric power is a fundamental input for the industrial production of the Johnson&Johnson plant in São José dos Campos-SP. Keeping the park operating correctly has always been a priority for the maintenance…
Abstract Because many transformer flaws originate at the bushings, in order to reduce the shutdowns for tests the offline tests on bushings have been replaced by online monitoring, which has been providing new…
Abstract The increasing demand for greater reliability and continuity in electricity supply, confirmed by new applications of electricity, such as electric cars, for example, are reflected in industry regulations, which provide heavy financial…
Abstract Condensive bushings are an essential part of the insulation mechanism of high voltage equipment. Monitoring this component helps in the early detection of failures, making it possible to have a more effective…
Summary Due to large quantity of cabling needed for implanting a monitoring and control system using conventional equipment, Escelsa Energias do Brasil adopted a system with a communication bus, connecting various sensors to…
Abstract Resolution ANEEL 505 made voltage supply limits even stricter. As a result, voltage regulation in some of ELEKTRO’s facilities was difficult, and satisfactory results were not being obtained with conventional regulation relays…
Abstract The purpose of this paper is to study the results of the implementation of the pilot project power transformer use maximization, without compromising the service life of the equipment and the reliability…
Abstract The importance of transformers in the SS Margem Direita of Itaipu for supply of power to Paraguay led to the installation of a pilot project for on-line monitoring in November 2006, which…
Abstract The relevance of Ibiúna Converter Substation for the supply of electricity to São Paulo led Furnas to select the online monitoring of converter transformers, initially by replacing mechanical temperature measurement systems with…
Abstract Due to the regulation of Brazil's electricity sector, the unavailability of power transmission equipment, such as power transformers, imply in the application of very high fines to equipment owner, whether the unavailability…
Abstract In general, even though the unit cost for bushings is relatively low if compared to the total cost of the equipment where it is applied, a bushing insulation failure can result in…
Abstract Power Transformers, essential for transmission and distribution networks and, usually the more important assets of a substation, can have eventual failures diagnosed or predicted through online monitoring systems based on decentralized architecture.…
Abstract The on-line capacitance and AC bushing delta tangent monitoring has reached good results in its application on power reactors and transformers. However, its direct application in converter transformer condensive bushings, with the…
Abstract This article, published in Eletricidade Moderna magazine, shows the principle of operation of the monitoring condensive high voltage bushings in equipment such as transformers and reactors with application examples and typical topology…
Abstract In 2001, the first commercial online power transformer monitoring system in Brazil was installed at Alumar, one of the largest aluminum production complexes in the world. The monitoring system was installed on…
Abstract This report presents the data obtained from deployment of two MO Moisture Monitors in an oil drying machine at Elektro’s Tatuí Substation. It also brings the comparison between the online readings of…
Abstract In 2001 Eletrosul started operation of Itajai substation with two 150MVA 230-138kV power transformers with OLTC. This paper will present the philosophy and field experience with the On-line Monitoring of these transformers…
Abstract This work analyzes the practical results from implementation and operation of a modern predictive monitoring system in high voltage transformers of the Braskem unit substations in São Paulo (PE8 Cubatão and PP4…
LAD has Treetech technology to control and thermal protection, with the cost adapted to small applications. Developed for applications in oil transformers, dry-transformers, motors and generators, the IED is prepared to receive up…
Abstract The present electric power scenario in Brazil and abroad has led companies in the industry to operate in a highly competitive context, forcing those companies to constantly strive for better efficiency, higher…
Abstract When a transformer is subject to high currents caused by short circuit, electromechanical internal stresses can cause geometric changes in the windings such as strains and displacements. These strains are harmful because…
Abstract The purpose of this technical paper is to describe the wireless communication network technology integrated in the monitoring system inside the Santo Ângelo substation in order to improve performance, customize the communication…
Abstract The Step Up Transformers at the Tucuruí Hydroelectric Power Plant are very important for the National Interconnected System (SIN). Due to that, and due to the severe work conditions, Eletrobrás Eletronorte has…
Abstract High voltage assets in substations, such as transformer and reactors, are crucial for the safe operation and continuity of the electric power supply. Consequently online monitoring systems have been used to increase…
Abstract The substitution of insulating mineral oils with fluids or plant origin in power transformers has awakened a high degree of interest in recent years. This is due to diverse factors such as…
Abstract Capacitance and tangent delta are acknowledged as some of the main parameters for bushing insulation condition diagnosis, because they are directly affected by the deterioration of the insulation. This article intends to…
Abstract In order to increase the substation’s transformation capacity, Furnas substation in the city of Campinas, received a new bank of 345-138/13,8kV 150MVA single phase, auto-transformers with on load shunt changers, comprised of…
Abstract The objective of this article is to show the advantages of modernization carried out in the voltage regulation systems and measuring temperature of 60 MVA power transformer. This project served as a…
Abstract Power transformers are vital components in a transmission system. The work to keep this equipment in dependable operating conditions depends a lot of its system to measure oil and winding temperature. It…
Abstract The changes in maintenance philosophy, with migration of maintenance actions from Preventive to Predictive have led to the adoption of On-line Power Transformer Monitoring Systems as one of the main tools used…