... all stator and rotor related monitoring solutions and support for turbogenerators and motors. Qualitrol-Iris Power also has world-class machines experts to aid with data interpretation. Flexible and modular platform: Additional technologies such as Shaft Voltage & Current monitoring are also availab ...
Low-Cost Current-Fed PMSM Drive System With Sinusoidal Input
... charge controller. It should be noted that motor speed sensing is not necessary because the speed feedback signal can be derived from the inverter synchronization signals. The complete control system uses only one sensor for the dc link current. Inverter triggering signals are synchronized to the ro ...
... charge controller. It should be noted that motor speed sensing is not necessary because the speed feedback signal can be derived from the inverter synchronization signals. The complete control system uses only one sensor for the dc link current. Inverter triggering signals are synchronized to the ro ...
the contribution of double-fed wind farms to transient voltage and
... short circuit faults, wind farms can hardly provide reactive power support in a short time and they lack transient voltage control capability. The absence of transient reactive power and voltage control ability of large-scale double-fed wind farms brings greater risks to grid operation and is unfavo ...
... short circuit faults, wind farms can hardly provide reactive power support in a short time and they lack transient voltage control capability. The absence of transient reactive power and voltage control ability of large-scale double-fed wind farms brings greater risks to grid operation and is unfavo ...
14PE15 Single Power-Conversion AC–DC Converter with High
... series-resonant circuit of the output-voltage double removes the reverse-recovery problem of the output diodes. The proposed converter provides maximum power factor 0.995 and maximum efficiency of 95.1% at the full load. The operation principle of the converter is analyzed and verified. Experimental ...
... series-resonant circuit of the output-voltage double removes the reverse-recovery problem of the output diodes. The proposed converter provides maximum power factor 0.995 and maximum efficiency of 95.1% at the full load. The operation principle of the converter is analyzed and verified. Experimental ...
EW22912916
... In today„s fast processing environment, the use of dynamic circuits are becoming increasingly popular [7]. Dynamic CMOS circuits are defined as those circuits which have an additional clock signal inputs along with the default combinational circuit inputs of the static systems. Dynamic systems are f ...
... In today„s fast processing environment, the use of dynamic circuits are becoming increasingly popular [7]. Dynamic CMOS circuits are defined as those circuits which have an additional clock signal inputs along with the default combinational circuit inputs of the static systems. Dynamic systems are f ...
Auto-biasing white LED drivers reduce overall power
... LCD module, which needs to be illuminated all the time. While there are many manufacturers of standalone white LED drivers, one technique for currentcontrol boost converters automatically optimizes current efficiency, regardless of the number of LEDs it supports. All color displays need some form of ...
... LCD module, which needs to be illuminated all the time. While there are many manufacturers of standalone white LED drivers, one technique for currentcontrol boost converters automatically optimizes current efficiency, regardless of the number of LEDs it supports. All color displays need some form of ...
MT-88 Manual - American Fibertek
... contact closure signals. It is designed to operate with the MR-88 or RR-89 contact closure receiver over one singlemode fiber optic cable. The 88 series receiver has a user selectable switch that allows the contact status sent by the MT-88 to be maintained unchanged through loss of optical or electr ...
... contact closure signals. It is designed to operate with the MR-88 or RR-89 contact closure receiver over one singlemode fiber optic cable. The 88 series receiver has a user selectable switch that allows the contact status sent by the MT-88 to be maintained unchanged through loss of optical or electr ...
Unit 6: Electrical and Electronic Principles - Edexcel
... The modern world relies on electrical and electronic devices – from mobile telephones to jet aeroplanes, these devices have had an enormous impact on the way we live today. Without early engineers such as Faraday and Lenz, who studied the then new concept of electricity, many of the inventions we no ...
... The modern world relies on electrical and electronic devices – from mobile telephones to jet aeroplanes, these devices have had an enormous impact on the way we live today. Without early engineers such as Faraday and Lenz, who studied the then new concept of electricity, many of the inventions we no ...
A Merged-Stage High Efficiency High Power Factor HB
... output. This topology is similar to the one presented in [17,18], used for fluorescent lamps. However, unlike the previous solution, it does not need a big electrolytic capacitor and can operate with high input voltages, i.e. full range of line voltages. In this converter, both stages share a half-b ...
... output. This topology is similar to the one presented in [17,18], used for fluorescent lamps. However, unlike the previous solution, it does not need a big electrolytic capacitor and can operate with high input voltages, i.e. full range of line voltages. In this converter, both stages share a half-b ...
Nominal 48 V input range - Power Sources Manufacturers Association
... Most systems include a low input shutdown (LISD) function, to shut down the DC-DC converters if the input voltage falls below the minimum. Assuming the LISD is set to 37±1 V, the minimum voltage at the DC-DC converter is 36 V. At the other extreme, the maximum voltage for a -48 V power system is nor ...
... Most systems include a low input shutdown (LISD) function, to shut down the DC-DC converters if the input voltage falls below the minimum. Assuming the LISD is set to 37±1 V, the minimum voltage at the DC-DC converter is 36 V. At the other extreme, the maximum voltage for a -48 V power system is nor ...
High Current Low Voltage Solution For Microprocessor
... microprocessor power is small size. As CMOS fabrication capabilities continue to evolve it becomes possible to include more transistors on a die, and hence more functionality within a microprocessor chip. By the same token, the increased functionality applies to the motherboard as well, as increasin ...
... microprocessor power is small size. As CMOS fabrication capabilities continue to evolve it becomes possible to include more transistors on a die, and hence more functionality within a microprocessor chip. By the same token, the increased functionality applies to the motherboard as well, as increasin ...
LI3519411946
... design have small nodal capacitance which results in high speed. To realize any function logically, PT design uses less number of transistors so that there is low power dissipation. Reduced number of transistors occupies small area which leads to low interconnection effect [7-10]. There are two main ...
... design have small nodal capacitance which results in high speed. To realize any function logically, PT design uses less number of transistors so that there is low power dissipation. Reduced number of transistors occupies small area which leads to low interconnection effect [7-10]. There are two main ...
dynamics and 8tability of wind amd diesel
... or through nuclear energy and wherever possible through hydro resources. All of these in addition to other disadvantages give rise to environmental issues of varied nature. It is therefore necessary to consider the problems of electrical energy generation and environment jointly so that the growing ...
... or through nuclear energy and wherever possible through hydro resources. All of these in addition to other disadvantages give rise to environmental issues of varied nature. It is therefore necessary to consider the problems of electrical energy generation and environment jointly so that the growing ...
Solution
... percent and a per-unit reactance of 5 percent (data taken from the transformer’s nameplate). The magnetizing impedance is j80 per unit. (a) Find the equivalent circuit referred to the low-voltage side of this transformer. (b) Calculate the voltage regulation of this transformer for a full-load curre ...
... percent and a per-unit reactance of 5 percent (data taken from the transformer’s nameplate). The magnetizing impedance is j80 per unit. (a) Find the equivalent circuit referred to the low-voltage side of this transformer. (b) Calculate the voltage regulation of this transformer for a full-load curre ...
VGA 400.2 VGA 600.2 VGA 800.2 VGA 1600.2 VGA 320.4 VGA
... Short Circuit Protection engaged: The amplifier will turn off and try to come back on immediately. The amplifier will cycle like this indefinitely, with "blips" of sound each time. If this is the case, check your speakers and wiring for low impedance and short circuits. Thermal Protection engaged: T ...
... Short Circuit Protection engaged: The amplifier will turn off and try to come back on immediately. The amplifier will cycle like this indefinitely, with "blips" of sound each time. If this is the case, check your speakers and wiring for low impedance and short circuits. Thermal Protection engaged: T ...
AN2048
... Characterization results As we can see from Figure 9, 10 and 11, we can achieve a minimum gain of 12 dB with an input return loss better than 5 dB and a drain efficiency between 55% and 65% over the frequency band 445 ÷ 475 MHz. Even so the output power can be controlled through Vgs, a minimum of 15 ...
... Characterization results As we can see from Figure 9, 10 and 11, we can achieve a minimum gain of 12 dB with an input return loss better than 5 dB and a drain efficiency between 55% and 65% over the frequency band 445 ÷ 475 MHz. Even so the output power can be controlled through Vgs, a minimum of 15 ...
Power engineering
Power engineering, also called power systems engineering, is a subfield of energy engineering that deals with the generation, transmission, distribution and utilization of electric power and the electrical devices connected to such systems including generators, motors and transformers. Although much of the field is concerned with the problems of three-phase AC power – the standard for large-scale power transmission and distribution across the modern world – a significant fraction of the field is concerned with the conversion between AC and DC power and the development of specialized power systems such as those used in aircraft or for electric railway networks. It was a subfield of electrical engineering before the emergence of energy engineering.Electricity became a subject of scientific interest in the late 17th century with the work of William Gilbert. Over the next two centuries a number of important discoveries were made including the incandescent light bulb and the voltaic pile. Probably the greatest discovery with respect to power engineering came from Michael Faraday who in 1831 discovered that a change in magnetic flux induces an electromotive force in a loop of wire—a principle known as electromagnetic induction that helps explain how generators and transformers work.In 1881 two electricians built the world's first power station at Godalming in England. The station employed two waterwheels to produce an alternating current that was used to supply seven Siemens arc lamps at 250 volts and thirty-four incandescent lamps at 40 volts. However supply was intermittent and in 1882 Thomas Edison and his company, The Edison Electric Light Company, developed the first steam-powered electric power station on Pearl Street in New York City. The Pearl Street Station consisted of several generators and initially powered around 3,000 lamps for 59 customers. The power station used direct current and operated at a single voltage. Since the direct current power could not be easily transformed to the higher voltages necessary to minimise power loss during transmission, the possible distance between the generators and load was limited to around half-a-mile (800 m).That same year in London Lucien Gaulard and John Dixon Gibbs demonstrated the first transformer suitable for use in a real power system. The practical value of Gaulard and Gibbs' transformer was demonstrated in 1884 at Turin where the transformer was used to light up forty kilometres (25 miles) of railway from a single alternating current generator. Despite the success of the system, the pair made some fundamental mistakes. Perhaps the most serious was connecting the primaries of the transformers in series so that switching one lamp on or off would affect other lamps further down the line. Following the demonstration George Westinghouse, an American entrepreneur, imported a number of the transformers along with a Siemens generator and set his engineers to experimenting with them in the hopes of improving them for use in a commercial power system.One of Westinghouse's engineers, William Stanley, recognised the problem with connecting transformers in series as opposed to parallel and also realised that making the iron core of a transformer a fully enclosed loop would improve the voltage regulation of the secondary winding. Using this knowledge he built a much improved alternating current power system at Great Barrington, Massachusetts in 1886. In 1885 the Italian physicist and electrical engineer Galileo Ferraris demonstrated an induction motor and in 1887 and 1888 the Serbian-American engineer Nikola Tesla filed a range of patents related to power systems including one for a practical two-phase induction motor which Westinghouse licensed for his AC system.By 1890 the power industry had flourished and power companies had built thousands of power systems (both direct and alternating current) in the United States and Europe – these networks were effectively dedicated to providing electric lighting. During this time a fierce rivalry in the US known as the ""War of Currents"" emerged between Edison and Westinghouse over which form of transmission (direct or alternating current) was superior. In 1891, Westinghouse installed the first major power system that was designed to drive an electric motor and not just provide electric lighting. The installation powered a 100 horsepower (75 kW) synchronous motor at Telluride, Colorado with the motor being started by a Tesla induction motor. On the other side of the Atlantic, Oskar von Miller built a 20 kV 176 km three-phase transmission line from Lauffen am Neckar to Frankfurt am Main for the Electrical Engineering Exhibition in Frankfurt. In 1895, after a protracted decision-making process, the Adams No. 1 generating station at Niagara Falls began transmitting three-phase alternating current power to Buffalo at 11 kV. Following completion of the Niagara Falls project, new power systems increasingly chose alternating current as opposed to direct current for electrical transmission.Although the 1880s and 1890s were seminal decades in the field, developments in power engineering continued throughout the 20th and 21st century. In 1936 the first commercial high-voltage direct current (HVDC) line using mercury-arc valves was built between Schenectady and Mechanicville, New York. HVDC had previously been achieved by installing direct current generators in series (a system known as the Thury system) although this suffered from serious reliability issues. In 1957 Siemens demonstrated the first solid-state rectifier (solid-state rectifiers are now the standard for HVDC systems) however it was not until the early 1970s that this technology was used in commercial power systems. In 1959 Westinghouse demonstrated the first circuit breaker that used SF6 as the interrupting medium. SF6 is a far superior dielectric to air and, in recent times, its use has been extended to produce far more compact switching equipment (known as switchgear) and transformers. Many important developments also came from extending innovations in the ICT field to the power engineering field. For example, the development of computers meant load flow studies could be run more efficiently allowing for much better planning of power systems. Advances in information technology and telecommunication also allowed for much better remote control of the power system's switchgear and generators.