The paper presents how the physical phenomenon, corona discharge, can be assessed using circuits for measuring partial discharges (PD) and radio disturbances. In test PD measurement, may also present as a disturbing element at certain voltages, even if all measures are taken to avoid them. main features differences between measurement circuit interference voltage presented, which include systems their calibration methods. So presented of with same impulse charge but different type filters...

Contactless power transmission is a major concern due to its many applications in the modern technique. Different topologies for near field are presented literature, with emphasis on efficiency of process, especially when such systems used medium or high power, like those needed charging storage batteries electric/hybrid cars. This paper analyzes one system's key elements which provides magnetic inductive transfer between supply and load, hereinafter referred as coupler. For fast...

Wireless power transmission is a special concern of electrical engineering with major implications in the life society. It manifested both scientific field through large number congresses and prestigious journals publications as well various practical applications ranging from medical care to robotics, communications military technique. After latency more than 100 years since Tesla's inventions, advances microelectronics electronics have led capitalization this field. Now time when different...

The air pollution in large urban agglomerations can be drastically reduced by electrical mobility which covers all means of road transport: personal cars, freight cars and especially buses. All them are dependent on the existence charging stations that able to ensure their batteries at home, parking lots, route or depots. Compared classic, conductive (Plug-In), contactless (Wireless Power Transfer - WPT) is a disruptive technique with numerous advantages allows static, semi-dynamic...

Contactless power transfer is a major concern due to its many applications in the modern technique. Different topologies for transmission near field (magnetic or electric) are presented literature, with emphasis on process efficiency, especially when such systems used medium high powers, like those needed charging storage batteries from electric/hybrid cars. One of key elements system that provides contactless magnetic inductive coupling between source and user, herein after referred as...

This paper presents a review of the existing charging technologies for EVs, followed by presentation proposed solution based on several distributed transmitter coils supplied parallel resonant inverters sequentially energized depending position receiver coil mounted vehicle. Then reduced scale demonstrator with an lane meters, containing elements real system, will be presented. Numerical 3D simulations are used to calculate parameters inductive system and their variation EV as well energy...

In recent years, many results in the field of contactless power transfer by inductive coupling have been published. Practical applications start from very low delivered powers a few mW case medical implants, up to order kW charging electric vehicle (EV) batteries. The key element system is coupler made two planar coils certain (circular or rectangular) shape, located at variable distances one another. this paper there are analyzed couplers used EV, for transferred tens kW, with view...

Two models of two-way radio transceivers, usually used for communication in front the face, are investigated determining their both near field components air and specific absorption rate energy deposition simulating-tissue liquids, at frequency 446 MHz. In range 2–20 cm distance device positioned next to 5W output power 100% duty cycle transmission, human protection could be partially ensured occupational use, but not public use. For 1 W 500 mW power, use becomes safe, as reported safety...

Contactless power transfer is at present a successful unconventional method for using the electromagnetic field properties, with many practical advantages in most different activity fields: robotics, connectics, lighting, medicine, easy to use water, aggressive or potentially explosive environment. The non-radiative methods near (electric, magnetic), where efficiency comparable that of galvanic contact transmission short and medium distances, are developing. Many theoretical experimental...

This study presents issues related to electromagnetic pollution and the level of magnetic field radiation occurring around conductors used for electricity transmission distribution. The fact that modeling simulation are most efficient methods optimization, considering cost–benefit ratio, was premise this work. paper proposes performance a complex analysis, carried out in comparative manner, which includes physical tests simulations existing distribution cables transformer substations. In...

The paper presents a study on the degree of electromagnetic field exposure workers in electric power distribution stations. For this purpose, they performed series tests electricity transmission cables used transformer Based results obtained from experimental testing carried out, levels to influences and magnetic fields existing area where these are located were determined. This is interest because maximum limits regulated by Decision Romanian government HG 520/2016 July 20, 2016 Directive...

This work presents aspects related to the protection that must be provided workers against safety and health risks when they are exposed electromagnetic fields. A series of experimental determinations carried out in compatibility (EMC) laboratory presented. The purpose tests is determine level field registered room under conditions where measurements not out. We considered dedicated testing equipment was turned off during experiments. measured check if it exceeds maximum limit imposed by...

In many measurement technique applications (high voltage engineering, pulse power electronics, electromagnetic compatibility a.s.o.) it is necessary to measure some current pulses with ns durations, superimposed on periodical currents different shapes or frequencies. When detecting partial discharges (PD), short duration impulses are a low frequency (usually line frequency) carrier signal. If High Frequency Current Transformers (HFCTs) used PD in large capacitors capacitor banks, the...

The measurement and monitoring of some important parameters characteristic for the equipment health evolution, from moment leaving manufacturing company throughout active life, is contained in standards field followed carefully by organizations that use equipment. paper deals with issues related to accurate Partial Discharges (PD) level electrical insulation and, particular, sensors used this purpose. Lately, inductive current are more instead classical measuring impedances RLC type provided...

Use of air core or open magnetic resonant transformers is a modern technique for generating some high reactive powers necessary to test the insulation power capacitors, cables and electric machines. In this paper it shown design non - conventional transformer with internal parallel resonance able operate within narrow frequency range agreed by standards (45 – 65 Hz) using simple inverter. The inverter assembly compact easily transportable on site as compared closed circuit.

Abstract Portable transceivers emitting in the UHF radiofrequency band are sources of human electromagnetic exposure, when located front face. Three output power levels were tested while exposed target was a phantom filled with dielectric liquid simulating average head behavior at used frequency 446 MHz. A flat and scanned by an automatic E-field probe robot, based on standardized procedure, order to report specific absorption rates energy deposition head. discussion obtained results is...

During recent years, the pronounced electromagnetic pollution of environment makes it ever more necessary to increase number calibrated field strength meters aiming at a better protection people and equipment against radiations. The paper presents calibration procedure RF in antenna inside semi-anechoic chamber (SAC) ICMET. whole process is automatically controlled by computer. Some experimental results certify system such as uniformity, conversion factor measurement uncertainty are also presented

Wireless charging of electric vehicle batteries is a modern technology real interest to replace the classical solutions with plugged-in chargers their mechanical and electrical hazards related cables power connectors. Although technical solution near-field contactless transfer well known, several achievements are described in literature, issues time, efficiency, system stability real-world conditions EMC-related problems remain wider interest. In such context, this paper presents novel...

In HV laboratories, the insulation of power transformers is tested with 1.2/50 μs lightning impulses (LI). According to current standards, test technique consists in comparing waveforms applied voltage and through winding checked, obtained at reduced voltage. Voltage measurement made a divider shunt. The paper analyzes replacement conventional shunts high frequency pulse (HFPCT) that currently have competitive price performance, including advantage they no point earthed so avoid common mode...

This paper presents aspects regarding the measurement technique in order to implement recommendations for evaluating absorption of radio-frequency (RF) signals, according IEEE Std. 1128-1998(R2012). To characterize properties materials used field signal absorption, standard recommends several test methods, opting arch method. A type RF absorber with pyramidal geometry was tested, measurements being carried out frequency range 3 - 5 GHz, horn antennas. without absorbents first performed...