The paper describes a new integrated power supply station for Auxiliary Services (AS) to install in Primary Substation. The new station provides several innovative logic functions to improve the life cycle of the battery. Furthermore, to improve the reliability of device, the new station foreseen a double parallel branch rectifier stage. The costs-benefits analysis shows that the investment return time for each plant in which the new station will be installed is about 5 years.

In the paper, an analytical method for determining the optimal positioning of intelligent electronic devices in medium voltage grids is proposed. Intelligent electronic devices are automated devices able to communicate one with each other and command the circuit breaker in order to localize and isolate a line fault as fast as possible. However, the number of intelligent electronic devices to install has to be limited, due to the relevant installation costs and the reduction in the transmission bandwidth caused by the increased number of exchanged messages. So, the electrical distributor has to carefully detect the nodes of the grid where the intelligent electronic devices have to be installed. The authors propose a method based on integer linear programming, which, given the number of intelligent electronic devices to install, finds their optimal position, i.e., the one that minimizes the penalties associated with the power down experienced by customers. In order to highlight the offered advantages in terms of computational effort, the proposed approach has been assessed with a real medium voltage grid.

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