This paper presents a novel solution for the protection of high-voltage power cables based on differential protection principles with currents measured by Rogowski Coil current sensors. This solution has been designed for implementation on four in-service 220 kV power cables that interface a gasinsulated substation (GIS) with overhead transmission lines. The protection scheme has been subjected to extensive testing in a high power laboratory and in a field application that provided extreme power system operating conditions. All tests have verified the high dependability and security of the solution.
This work aims to make a comparison between disconnector circuit breakers (DCB) and conventional circuit breakers, with the purpose of evaluating the feasibility of implantation in several installations in Brazil that follow procedures and regulations of the agents of the Brazilian electric sector. The development of DCB technology has allowed an increase in the reliability and availability of the substations, which has contributed to the reduction of failures and, consequently, of the costs related to the maintenance of the substations that incorporate these types of circuit breakers in their projects [1]. It is worth mentioning that, due to the innovative technology of combining two functions (circuit breaker and disconnector) in the same protection device, DCB are not only reducing the amount of raw materials and the emission of gases that favor global heating, but also a relevant reduction of the space occupied by substations that adopt these types of devices in their projects, about 75%, thus resulting in substations more ecologically and economically sustainable substations [1, 2].
The condition of mechanical integrity and the reliability of interconnected storage tanks in the oil export logistics chain in the Brazilian maritime terminals gains in importance in the continuity and operational safety in the coming years. These tanks have large diameters and characteristics that make it difficult to inspect in operation and monitor corrosion damage of the bottom plates. In this scenario, the concern arose with the exhaustion of the installed capacity, which may lead to consequent failures due to loss of containment, compromising not only people, facilities and the environment, but the sustainability of the business itself. Acoustic emission tests were carried out in two oil storage tanks of the marine terminal aiming at the detection and location of regions with corrosive process in the bottom plates. After evaluating the results, it was verified: (1) the relationship between the results found and the expected benefits; (2) the motivations for the use of the technique as an auxiliary tool for monitoring the integrity of the bottom of the tanks in operation; and (3) more assertive planning of shutdowns for general maintenance and internal inspection.
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