Two years ago, Belgian system operator ELIA started with the development of an intelligent quality management system (the Q-master project). This paper describes the first phase of the project, which consisted of developing a big database with power quality data from different types of monitoring devices: not just quality monitoring devices, but also fault recorders and digital revenue meters. Applications were developed to process all power quality data to indices that characterise the system and the customer's level of power quality.
Distributed Generation (DG) influences the traditional protection schemes. In this paper the influence of DG on the protections of the Belgian grid operator, Elia, is explained for a 70 kV/15 kV transformer in antenna. Based on the method of the symmetrical components, the detection of two different types of protections, zero-sequence overvoltage, U0>, and negative-sequence overvoltage, U2>, are analysed in case of a line-to-ground fault, a broken conductor without earth fault and a broken conductor with earth fault at the transformer side. The U0>relay is to be installed in the star point at the primary side of the transformer and measures the zero-sequence voltage. The U2>relay calculates the negative-sequence voltage at the secondary side of the transformer.
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