The Synthesis and Analysis of Partial Discharges from Stator Winding Insulation of Hydro Generators

In this paper to perform the partial discharges which appear in stator winding insulation, the main characteristic measures of these, measurement and the results of partial discharges test

Study for a photovoltaic system to supply electricity to an isolated apiary

The paper presents, based on the study and the experience of the authors in the field, some considerations, especially from an application aspect, useful in building a photovoltaic system for supplying electricity to an isolated apiary, as well as simulations for such a system, made with the PVGIS program . The main high-performing electric machines of today with relatively high energy consumption from an isolated beehive are identified, as well as their specific mode of use, during a calendar year, an essential factor for establishing the installed power of such a photovoltaic system and a its effective technical-economic design

Mathematical Model of Lifetime Duration at Insulation of Electrical Machines

Abstract. This paper present a mathematical model of lifetime duration at hydro generator stator winding insulation when at hydro generator can be appear the damage regimes. The estimation to make by take of the programming and non-programming revisions, through the introduction and correlation of the new defined notions

Study for monitoring of the insulation stator winding of the hydro generators using a data acquisition system

The paper presents a study for a system for data acquisition in order to monitor online the state of the insulation stator winding of hydro generators, using the LabVIEW graphical programming language. The data acquisition system allows the acquisition of the quantities of interest in the process and at the same time, through it, the creation of a strong database for the current state of the hydro generator insulation

Model of microprocessor centrifugal equipment for honey extraction

The paper presents a model of centrifugal equipment for extracting honey made around an ATmega 328 processor, with which the Arduino Uno module is equipped. The created model is functional, being tested, and the practical results obtained would allow the transition to prototype equipment. The created model is flexible, allowing to obtain flexible operating cycles, with variable speeds, soft settable, in both directions of rotation. The number of frames from which the bee honey can be extracted is variable depending on the juicer itself, which is driven by the motor

Study of the Accelerated Degradation of the Insulation of Power Cables under the Action of the Acid Environment

Over operation time, there are a number of internal and external factors that change the characteristics of dielectric materials that are part of the electrical equipment. In areas with high pollution, an important requirement is the acidic chemical compounds in the soil in which the power cables are laid, which penetrate the insulation by infiltration, resulting in changes in the parameters of electrical insulation and causing a decrease in operating time. The paper is focused on the analysis, through a series of experimental determinations, of the effects of stresses to which the power cables laid in acidic environments are subjected, by simulating the operating conditions in the laboratory, obtaining concrete results. It also describes the direct current test installation used in the laboratory and presents the two stages of testing the cable sample inserted in the electrolyte, the first being a stage of accelerating the degradation of the insulation by supplying higher voltages to require insulation, and the second stage being the testing in the absence of the electric field, under the direct action of the chemical compounds from the installation tank. Given that in alternating current, the electric field causes an additional heating of the dielectric due to energy losses by electric polarization, the test is performed in direct current, precisely to be able to monitor the variation of insulation resistance in relation to temperature and losses through conduction currents, as a result of the Joule–Lenz effect and not as a result of the dielectric polarization process. At the same time, the power of the direct current source used is lower compared to that of an alternative current test source and does not contribute to the generation of electrical discharges during testing

The command of the Flour Transport Pumps in a Cereal Mill with PLC Siemens S7-1200

This paper presents pump control with PLC Siemens Simatic S7 - 1200, for transporting flour designed to be implemented in the Pfalzmühle Mannheim. The order was designed to replace the old system made in various traditional contacts and relays. Programming PLC Simatic S7 - 1200, which is a powerful and reliable, a new generation, was conducted in FBD. In order to verify the accuracy and to optimize the operation of the control system was built a functional model

Study of the Accelerated Degradation of the Insulation of Power Cables under the Action of the Acid Environment

Over operation time, there are a number of internal and external factors that change the characteristics of dielectric materials that are part of the electrical equipment. In areas with high pollution, an important requirement is the acidic chemical compounds in the soil in which the power cables are laid, which penetrate the insulation by infiltration, resulting in changes in the parameters of electrical insulation and causing a decrease in operating time. The paper is focused on the analysis, through a series of experimental determinations, of the effects of stresses to which the power cables laid in acidic environments are subjected, by simulating the operating conditions in the laboratory, obtaining concrete results. It also describes the direct current test installation used in the laboratory and presents the two stages of testing the cable sample inserted in the electrolyte, the first being a stage of accelerating the degradation of the insulation by supplying higher voltages to require insulation, and the second stage being the testing in the absence of the electric field, under the direct action of the chemical compounds from the installation tank. Given that in alternating current, the electric field causes an additional heating of the dielectric due to energy losses by electric polarization, the test is performed in direct current, precisely to be able to monitor the variation of insulation resistance in relation to temperature and losses through conduction currents, as a result of the Joule–Lenz effect and not as a result of the dielectric polarization process. At the same time, the power of the direct current source used is lower compared to that of an alternative current test source and does not contribute to the generation of electrical discharges during testing

Command and Running of an Experimental Model Vehicle for Covering a Labyrinth Type Runway

The paper presents the command and running of an autonomous vehicle - experimental model – for covering a labyrinth type runway. The command is realized with a Micro Arduino type platform and the running with two mini engines of continuous power, each coupled to a tire. The program has been written in C++

Calculation of Digital Control Circuits using Scilab Environment

The paper presents the computing of digital control circuits using Scilab environment. It exemplifies the influence of the sampling time in case of a transfer system described by a PT3 element composed of one PT1 and one PT2 element. For a continuous control system, the transfer function in z is computed and replaced with a digital control system. The presented calculation, done in Scilab, highlights the test responses of the process evidencing the systems performances