The GIS elements of the electrical power distribution outage management system described in the following professional paper were developed from the TatukGIS DK. This paper has been presented to the international IECON 2003 conference (the 29th Annual Conference of the IEEE Industrial Electronics Society) to be held in Roanoke, Virginia on November 2 e 6, 2003. The system described in this paper is has been implemented at the Santa Maria Power and Light Company located in Colatina, Espirito Santo, Brazil. The author has been a DK licensed user since late mid February, 2003.
|Shared Radio System for Reclosers Control
Emerson Trarbach, Marcio Brumatti, Eduardo
Casotto and Jose L. F. Vieira
Electrical Engineering Department
Federal University of Espirito Santo
Viteria - Esperito Santo - Brazil
Paulo C. A. Almeida
Santa Maria Power and Light Company
Colatina, ES - Brazil
Abstract-Reclosers are typically used in the power electric plants to protect the system against temporary faults caused by natural effects (e.g., lightning, winds, trees) or permanent faults. Monitoring and controlling reclosers could be an expensive task depending on the type of reclosers are employed. A simple way to perform these tasks is by using radio communications capabilities.
This paper describes a system to control a net of reclosers over a shared radio system. A main computer allows to monitoring all system status by a GIS (Geographical Information System) based software that facilitates the user operation.
Generally, the power distribution system is protected by reclosers, which are compounded by a simple break and an electronic recloser relay interconnected. The purpose of recloser is reduce the fault time when a temporary problem occurs. The interrupts in the power electric source could be caused by natural phenomena such as: lightning, winds, trees or intentional faults like cars accidents, overloads, etc. After the fault, the recloser must try reconnect the source and load again, timing according to its internal program. If a fault still present away, the recloser open and a new timing cycle starts again. The process repeats until the internal program counter (typically 3 times) finalizes the process and the recloser remains open until manual operation. A recloser without communications capabilities could be a problem at this time, no alerts are sent to operators. Only the customers promote the signaling. The problem could be more complicate if a recloser is outside of the downtown. The time to reestablish the power should be long due to the distances. A monitored recloser should be the efficient solution for this problem. The communications facilities are increased near to the cities but outside, the communications conditions are poor and expensive. A good solution is a radio-based system capable to coverage a large area with low costs. A radio-based system described in this paper takes advantage of a shared radio-based system used to local communications on an electricity company that employ this monitoring system. The radio system is VHF Motorola compounded by personal radio unit, repeaters and vehicular units.
II. SYSTEM OVERVIEW
The main block diagram that describes the system, in a general way, is shown in the Fig1.
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