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Knowledge of the actual values of power system components parameters represents essential input for real time applications. In this regard, this paper presents a method for estimating transmission line and transformer parameters based on phasor measurement units (PMU) installed at both ends of the network components. Transmission line parameters are essential inputs for various applications such as...
A calorimetric measurement device based on the front photopyroelectric (PPE) configuration, consisting in a composite pyroelectric sensor and an irradiation LED, aimed to generate modulated optical excitation is presented. The proposed device is designed for on-field measurements and monitoring of a sample's thermal effusivity, when the investigated liquid is a semi-infinite layer. The composite PPE...
Thermoplastic materials from electrical and electronic equipment are very common in phones, televisions, and personal computers. However, many plastic components are concealed and which are used for the connection of assemblies and components. The unique properties of the electrically insulating thermoplastic material, sound, resistance to bending, flexibility, and durability are that thermoplastics...
In this paper a new architecture of a continuous sensors monitoring system based on charge amplifier and ARM microcontroller is proposed. In particular the electrical circuit, the schematic of a double system monitoring of sensors and Labview user interface were designed.
Electronic weighing instruments consist of a load receptor, an electromechanical converter, an electronic processing unit, a display and an interface. The object of the calibration is the indication provided by the instrument in response to an applied load. The results are expressed in units of mass. When is not possible to use only standard weights, the substitution loads may be used. With each substitution...
In this paper realization of digital LCR meter is presented. Realized system is based on integrated circuit AD5933 which is controlled by microcontroller ATmega128. Device can calculate resistance, capacitance and inductance of the device under test as well as Dissipation and Quality factors. Operating frequency range is from 5 to 100 kHz with frequency sweep function in maximum 511 steps. Device...
A resistive structure designed with graphene, thin 2D monoatomic layers of graphite, was deposited by dropcast method from a solution, on a ceramic substrate, between Copper electrodes. The obtained structure is proposed as temperature sensor and was tested in the cryogenic field down to 77K. The obtained numerical results from this investigation are compared with previous experimental results of...
The paper present studies on development, implementation, testing and evaluation of an intelligent system for human-machine interaction by voice that allows a mobile robot to learn through a language based on voice commands.
Low power microwave effects on Zea mays (corn) root meristeme tissues were studied in present work. Zea mays seeds exposed to 1GHz continuous wave for three different time durations and at two incident power levels were let to germinate post-exposure. Root tip cells in different mitotic division phases were investigated by specific cytological techniques in order to determine the mitotic index and...
In this paper a system for measuring impedance, based on AD5933 circuit is presented. The impedance measuring range is between 9 Ω and 18 MΩ for a 1 kHz ÷ 100 kHz frequency range. Possibilities of expanding this range of measurement are also presented in the paper. The system calibration is automatic and the relative error of the impedance modulus measurement is in the range ±2%. Measured impedance...
Research in recent years have led to the emergence of technologies for remote monitoring of patients with the wireless transmitted to biomedical signal obtained from various sensors. Specialist person who monitors can be connected via a router to the IP address of the wireless board monitoring system, and through software developed in LabVIEW graphical programming software can read the value of measuring...
This paper presents a few aspects regarding the modelling, simulation and monitoring of dynamic regimes for asynchronous motors. There are presented the two-axes mathematical model of these motors, the Simulink simulation program, the simulation results for the case of direct on-line starting, as well as a few experimental results (which confirm the simulations). The research originality derives from...
This paper reports a three-dimensional numerical study for the finned electric motor frame. The main objective is to optimize the housing geometry by choosing an appropriate number of fins for a given amount of housing material. A conjugated heat transfer problem is solved. Both laminar and turbulent flow with buoyancy effects is considered. In order to simplify the complexity of the numerical problem...
Accurate Battery Pack Modeling gains more and more importance in many applications such as Hybrid Electric Vehicles (HEVs), EVs [1],[2] and small embedded UPS devices [8],[9]. A high fidelity model gives information of the dynamics of the power delivery and the State of Charge (SOC), which is very important for estimating the runtime of these systems.
The paper presents a microgrid with one renewable source, photovoltaic (PV) panels respectively. To reduce the cost of the microgrid the authors propose an interface between the PV panels and the DC bus or the storage system with two DC/DC boost converters obtained with the help of a dedicated integrated circuit used for switch-mode power supplies (SMPSs) control. This module can be multiplied to...
The paper presents a new approach to store and read Transducer Electronic Data Sheets (TEDS) compliant with the IEEE 1451.4 standard. The idea is to take the bit stream of the TEDS structure and store it on a non-volatile, easy-to-read, cheap support as is the case of 2D bar codes. The TEDS structure can thus be stuck to the transducer case or printed on catalogues, ready to be read anytime and anywhere...
The paper introduces a speed servo drive with an automatic parameter tuning. A proportional controller (P-controller), a disturbance observer (DO) and a filter of the actual speed are used in the speed control loop. This structure is characterized by a low ripple of the manipulated variable. The identified value of the inertia moment is used to calculate the gain of the speed controller. An algorithm...
The morphological features and local properties of an semi-alicyclic polyimide film were closely evaluated by atomic force microscopy (AFM). These characteristics were optimized by applying high frequency plasma treatment, in order to increase their suitability for electronic purposes. Starting from the surface texture parameters, a deep analysis of the surface topographies at the interface with certain...
The paper presents the constructive solutions applied for the fabrication of three loop magnetic probes, followed by the affordable calibrating procedures. The performance factors obtained after these processes (edited as .csv format, each one associated with the corresponding calibration graph) were used in association with SPECTRAN NF-5035 capabilities, the selected option (from the main menu) for...
Metal oxide based electrochemical pH sensors are an alternative to the glass pH sensor, exhibiting many potential advantages in industrial and laboratory applications. In particular, thick film based pH sensors are promising devices for a next generation of wireless sensors for online monitoring of water pollution. So far, there have been many solid state materials used for pH sensor fabrication,...
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