Photovoltaic systems integrated to the grid have received considerable attention around the world. They can be connected to the electrical grid via galvanic isolation (transformer) or without it (transformerless). Despite making galvanic isolation, low frequency transformer increases size, cost and losses. On the other hand, transformerless PV systems increase the leakage current (common-mode c...

In this paper, we propose a dynamic file transfer scheme with coallocation architecture, called Dynamic Adjustment Strategy, a dynamic file transfer scheme with co-allocation architecture that reduce the file transfer times and improves the performance in Data Grid environments. Our approach reduces the idle time faster servers spend waiting for the slowest server, and decreases file transfer c...

We enhance the narrowing-driven partial evaluation scheme for lazy functional logic programs with the computation of symbolic costs. The enhanced scheme allows us to estimate the effects of the program transformer in a precise framework and, moreover, to quantify these effects. The considered costs are “symbolic” in the sense that they measure the number of basic operations performed during a c...

Moving to higher transition frequencies, lower supply voltages and smaller dimensions are, nowadays, general trends in the semiconductor industry. While operating at lower supply voltages results in a low-power design, smaller dimensions allow the use of a large number of transistors, a high transition frequency (fT) is accepted as an almighty-good, opening a way to a design of the amplifiers w...

The paper proposes an innovative design to develop a system based on AVR micro controller that is used for monitoring the voltage, current and temperature of a distribution transformer in a substation and to protect the system from the rise in mentioned parameters. Providing the protection to the distribution transformer can be accomplished by shutting down the entire unit with the aid of the R...

Power utilities are aware of the specific characteristics and requirements for their network. For this reason, they may require additional functionality from the protective devices and secondary systems included in their power network. Therefore ECEPA requires a number of specific tests to be conducted on the protection system proposed for a particular application to prove the suitability of th...