Journal of Sustainable Energy

4

Authors: AGAPE C.P., KILYENI ST., BARBULESCU C.

This paper presents a new design for a surveillance and control system of a medium voltage cell. The accent is on the acquisition of information of the consumer’s state, the instantaneous current consumption, power and voltage apparent to the consumer. The proposed design is based on Wilke Technology development board at its basis being a Tiny-tiger 2 Multitasking Microcontroller. This computer has 2 MByte or 4 MByte Flash for programming, and 1 MByte SRAM with backup input for data. On the software’s behalf we managed to create a Delphi Interface which communicates with the serial port on the development board. The interface takes information about the consumer and its capacity to load with voltage.

6

Authors: PĂCUREANU I., ALBUŢ-DANA D., BARLA E., MEIANU D.

The paper has three parts, in the first one, is presented the theoretical concepts that refer on the grounding lines fault, the treating mode, and implemented solutions for their detection in electric stations. In the second part is presented the result of the operational reliability analyse in period of 2011 – 2015, as in the final part of the paper are given the conclusions and identified solutions regarding the improving of operational reliability of the protection equipment of detection of grounding lines.

6

Authors: MOLDOVAN V., COROIU N., POPOVICI D., CÎMPAN M.

The influences of distributed electrical energy sources based on renewable energy resources over the power transmission and distribution systems are varied. The possible effects are more pronounced in the case of electricity generated using solar and wind resources, given the specificity and intermittency of the power produced from these resources. Photovoltaic systems (PVS) are one of the most promising renewable energy solutions. In case of the grid connected photovoltaic systems, these could provide many benefits to the network utilities. This paper intends to present the effects of PVS upon the power quality (PQ) parameters carried out in case of a radial distribution network within Bihor County Power System (BCPS), by analyzing the results of the measurements performed upon the electrical parameters from the point of common coupling (CCP) where these PVS are injecting the produced power. Measured values are compared with the limitations set in the international standards and the technical code of distribution networks, respectively the connecting conditions stipulated regarding these sources.

8

Authors: CSUZI I., CSUZI B.I.

Maintenance of transport infrastructure and vehicles is important cost element of the budget of local transport companies, cost reduction is optimized by adapting appropriate strategies. Obsolescence can directly and indirectly influence the operation and maintenance of public transport systems. Challenged by the technical wear and lack of spare parts, it is impossible to cover increased needs with amenities to the given level. The reliability and availability of transport systems will be adapted at minimal cost and maximum safety criteria. Case study: the tram system in Oradea.