This paper is a continuation of the paper “Examination of Micro Grid Operation in Island Condition, Focusing on Voltage Control” . It has presented the assessment of micro grids’ voltage and reactive power control. The increasing integration of intelligent energy distribution networks has to serve the interest of the consumers. Therefore, it is necessary to examine the quality of the electricity supply with regard to the voltage quality as well. How is it possible to ensure the regulation in those cases, e.g. in case of island operation? In the paper the model developed and used for simulating the micro grids are introduced and it is also shown how to apply them for island operation assessment. With the help of a model network the results of the simulations are presented and the conclusions are evaluated.
The wettability of a copper substrate by Sn–Ni alloy and the interfacial active properties of nickel were investigated. We determined the contact angle as a function of holding time in the Sn–Ni/Cu system at low Ni concentration. The contact angle of Sn can be decreased from 30° to 25° by adding 0.1 wt% Ni to Sn. We observed accumulation of the nickel at the solid–liquid interface. We assume that the nickel accumulation is caused by the interfacial active property of the nickel in an Sn–Ni/Cu system.
the holding time is increased from 5 min to 10 min, there is more time for the penetrated copper to diffuse further into the steel substrate bulk using the already formed channels of penetration. However, there are no reactive compounds formed in the
Authors:Nada Žnidaršič, Polona Mrak, Eva Rajh, Kristina Žagar Soderžnik, Miran Čeh, and Jasna Štrus
paraffin sections and methylene blue–Azure II staining for resin semithin sections. To localize Alcian blue reactive components that include acidic binding sites at the pH applied, Alcian blue staining was performed in paraffin and in resin sections
Constant stream of data has been generated and stored as more devices are being connected to the internet and supported with cloud technologies. The price drop of such applications along with industry 4.0 trending, triggered an explosive growth and demand for many IT modern solutions. From an industrial point of view, sensorization practices are spreading through factories and warehouses where software is constantly adapting to provide actionable insights in a data-driven configuration. The fourth industrial revolution is empowering the manufacturers with solutions for cost reduction, which translates in competitive advantage. The sector of maintenance operations is leading in engineering innovation, from reactive to planned preventive techniques the next step in history of proactive approaches is Predictive Analytics Maintenance.
This paper integrates a Real Power Differential Scheme (RPDS) for power transformer protection. The suggested RPDS for power transformer computes the active power loci during normal operation, switching, normal, and internal, involves turn to turn, and external faults at varied load angles. The proposed RPDS concept is based on monitoring and comparing the transformers primary and secondary active and reactive powers. The dynamic response of the proposed RPDS is tested 300 MVA, 220/66 kV, Y/Δ transformer. Furthermore, the suggested scheme is simulated with the use of Matlab/Simulink then tested for various fault and switching conditions. Moreover, the RPDS is checked for inter turn fault conditions at primary and secondary sides. The evaluation of the suggested scheme confirms the superiority of the proposed scheme to distinguish internal and external faults as well as magnetizing inrush currents with good selectivity, high speed, sensitivity, stability limits and high accuracy response of the power differential scheme. Finally, the suggested scheme is able to detect correctly the turn to turn faults for wide range of fault resistances but fails at very low values.
Authors:G. Lizia Thankam and Neelakantan Thurvas Renganathan
throughout the globe. Metakaolin inhibits a high equivalent quality of cement, and hence it is often referred to as High Reactivity Metakaolin (HRM). The non-reactive impurities in metakaolin are removed by water processing leaving the 100% reactive pozzolan
Authors:R.T. Mócsai, A. Maczó, C. Grünwald-Gruber, K. Majer-Baranyi, N. Adányi, P. Milotay, J. Czelecz, and R. Tömösközi-Farkas
, O.Y. , Weiss , J. , Wienkoop , S. , Lehmann , K. , Scheler , C. , Dölle , S. , Schwarz , D. , Franken , P. , George , E. , Worm , M. & Weckwerth , W. ( 2009 ). Evidence for novel tomato seed allergens: IgE-reactive legumin and
central-station generation. Integration of large quantities of wind power has, however, presented some challenges such as absorption of reactive power from the grid during faults, which affects system stability in weak power grids. Power generation using