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Sao Paulo, Brazil

AES Eletropaulo is a major Brazilian power distributor in the state of São Paulo, created in the breakup of the old state-owned power distribution company Eletropaulo that monopolized electricity distribution in São Paulo from 1981 to 1999. The similarity of the names makes most old customers call it simply Eletropaulo.The company has around 5.8 million customers - nearly 16.3 million people - in an area of 4526 kilometers ², in 24 municipalities in the metropolitan area of São Paulo, including the city itself;Its stock is traded on BM&F Bovespa, where it is part of the Ibovespa index. The company is majority owned by AES Corporation. Wikipedia.

Magrini L.C.,FDTE | Kayano P.S.D.,FDTE | Ogiboski L.,FDTE | Goncalves F.A.,AES Eletropaulo
2013 IEEE PES Conference on Innovative Smart Grid Technologies, ISGT LA 2013 | Year: 2013

The partial discharge analysis is one of the techniques used to diagnose the insulation degradation process of various electrical components. However, characterizing these partial-discharge sources in electrical components under operation becomes difficult due to the large amount of noise and interference. This article presents the development of a real-time monitoring system with partial discharge sensors installed in each phase of a transformer and in a power cable bay. The monitoring system also contains some other type of sensors, making it suitable to monitor some other substation elements. Regarding the correlation between the transformer ageing, the degradation of its solid insulation and the quality of the insulating oil. A database system and diagnosing software that will both manipulate the acquired information and suggest some maintenance policies are also part of the developed system. © 2013 IEEE.

Pereira F.,Marcelo Aparecido Pelegrini Sinapsis Inovacao em Energia | Martins J.C.,AES Eletropaulo | Duarte S.X.,University of Sao Paulo
2013 IEEE PES Conference on Innovative Smart Grid Technologies, ISGT LA 2013 | Year: 2013

Some customers; like hospitals, fire departments and traffic control; have special needs related to power supply. Sooner the power outage diagnostic, sooner the maintenance and the time without energy is reduced. Power quality problems can disturb traffic semaphores controls and the utilities do not have a real-time monitoring system for the low-voltage grid. An UPS with batteries was developed, for traffic semaphores with LED lamps, with a communication channel. This equipment can supply the semaphores during power failure and can transmit self diagnostic and information about the grid status to the utility. © 2013 IEEE.

Nascimento V.C.D.,AES Eletropaulo | Lambert-Torres G.,PS Solutions | Costa C.I.D.A.,Federal University of Itajuba | Borges Da Silva L.E.,Federal University of Itajuba
Electric Power Systems Research | Year: 2015

This paper describes a model for power distribution grid simulation with distributed generation, designed to be a simulation environment of two proposed elements: (1) an algorithm to reconfigure the circuit topology to enable a microgrid during an outage of power supply, and (2) a specific limiter to allow safe operation of distributed generation in the network. Moreover, an interface of the simulation model with a SCADA was designed to suggest possible operational screens for both: the generator and the utility. The simulation model was designed with a synchronous generator with all cogeneration typical controls: speed, active power, voltage, reactive power and power factor. Thus, it is possible to simulate critical situations with all control modes available in a typical cogeneration plant in addition to the proposed limiter. Due to the immense number of possible combinations of circuit breakers in the grid, the proposed algorithm is based on genetic algorithms to enable a fast enough autonomous reconfiguration to avoid the outage perception by the customer. ©2015 Elsevier B.V. All rights reserved.

De Oliveira A.L.,FDTE | Magrini L.C.,FDTE | Cunha C.,FDTE | Kim H.Y.,University of Sao Paulo | Kviatkowski M.A.,AES Eletropaulo
2013 IEEE PES Conference on Innovative Smart Grid Technologies, ISGT LA 2013 | Year: 2013

For the remote operation of transmission line circuit-switchers that are equipped with electric arches extinction chamber must be known the signal provided by mechanical flags that signalizes the status of SF6 gas pressure as well the state of the electrical contact inside of the chamber. This visual inspection required is costly and may generate delays, reducing the availability of the equipment. This R and D project proposed the development of a monitoring system supporting different technologies that will permit that AES Eletropaulo choose the better solution for each particular field condition. The developed system implements the automatic monitoring of the real status of mechanical flags by the use of the optical sensors, as well the state of the switch (open/closed) through position sensors and images captured e processed in the instant of the maneuver. © 2013 IEEE.

Navarro M.A.,Siemens AG | Monteiro A.J.,AES Eletropaulo
IEEE Transactions on Power Delivery | Year: 2015

This paper describes the concept and development of dry-type transformers for underground distribution networks, capable of operating in the open air, partially submerged or completely submerged without enclosure and in contact with water. The rating is in the range of 500 kVA to about 2000 kVA and 15- or 25-kV voltage. Immersion depth is limited to 3 m, due to the limits of the plug-in connectors on the high-voltage (HV) side of the transformer. A tap panel is provided on HV coils for ±5.0%. Dimensions and losses are comparable to those of liquid-immersed transformers. Electrical insulation is fully solid. The HV coils are shielded and the shield is grounded. © 1986-2012 IEEE.

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