Power Demand and Energy Usage of Container Crane
... To make a true comparison between AC and DC quay cranes, the electrical conditions have to be the same. It is assumed that the issue of poor power factor of DC drive quay crane has been solved (in the later section), comparison is now based on the peak kW demand rather than the peak kVA demand. As s ...
... To make a true comparison between AC and DC quay cranes, the electrical conditions have to be the same. It is assumed that the issue of poor power factor of DC drive quay crane has been solved (in the later section), comparison is now based on the peak kW demand rather than the peak kVA demand. As s ...
Evaluates: MAX9922/MAX9923 MAX9922 Evaluation Kit General Description Features
... and tested PCB used to evaluate the MAX9922 and MAX9923 ultra-precision, high-side current-sense amplifiers. An ultra-low offset voltage (VOS) of 10µV (max) allows accurate measurement of currents at both extremes of sense voltages (VSENSE), from 10mV to 100mV. The EV kit has a 1.9V to 28V input com ...
... and tested PCB used to evaluate the MAX9922 and MAX9923 ultra-precision, high-side current-sense amplifiers. An ultra-low offset voltage (VOS) of 10µV (max) allows accurate measurement of currents at both extremes of sense voltages (VSENSE), from 10mV to 100mV. The EV kit has a 1.9V to 28V input com ...
Power Factor in Electrical Energy Management
... plant etc.) introduces inefficiencies into the electricity supply network by drawing additional currents, called "inductive reactive currents". Although these currents produce no useful power, they increase the load on the supplier’s switchgear & distribution network and on the consumer's switchgear ...
... plant etc.) introduces inefficiencies into the electricity supply network by drawing additional currents, called "inductive reactive currents". Although these currents produce no useful power, they increase the load on the supplier’s switchgear & distribution network and on the consumer's switchgear ...
A Reduced Clock-swing Flip-flop (RCSFF) For 63% Power
... a clock system and a logic part itself consume almost the same power in various chips, and the clock system consumes 20–45% of the total chip power. In this clock system power, 90% is consumed by the flip-flops themselves and the last branches of the clock distribution network which directly drives ...
... a clock system and a logic part itself consume almost the same power in various chips, and the clock system consumes 20–45% of the total chip power. In this clock system power, 90% is consumed by the flip-flops themselves and the last branches of the clock distribution network which directly drives ...
Full PDF
... wires. For a given quantity of power transmitted, doubling the voltage will deliver the same power at only half the current. Since the power lost as heat in the wires is proportional to the square of the current for a given conductor size, or inversely proportional to the square of the voltage, doub ...
... wires. For a given quantity of power transmitted, doubling the voltage will deliver the same power at only half the current. Since the power lost as heat in the wires is proportional to the square of the current for a given conductor size, or inversely proportional to the square of the voltage, doub ...
Low Power Designs with CoolRunner-II CPLDs
... standard logic levels. In this case, the input buffer is driven into the linear region where the P and N channel transistors are both switched on. Therefore, to avoid this situation, I/Os can be configured to use internal pull-ups or bus hold circuitry. I/Os configured as inputs or bidirectional sho ...
... standard logic levels. In this case, the input buffer is driven into the linear region where the P and N channel transistors are both switched on. Therefore, to avoid this situation, I/Os can be configured to use internal pull-ups or bus hold circuitry. I/Os configured as inputs or bidirectional sho ...
Experiment 3 - Portal UniMAP
... The load on a large power transformer in a sub-station will vary from a small value in the early hours of the morning to a very high value during the heavy peaks of maximum industrial and commercial activity. The transformer secondary voltage will vary somewhat with the load, and because motors, inc ...
... The load on a large power transformer in a sub-station will vary from a small value in the early hours of the morning to a very high value during the heavy peaks of maximum industrial and commercial activity. The transformer secondary voltage will vary somewhat with the load, and because motors, inc ...
RF2174 0
... any RF device. High currents lead to high channel temperatures and may force early failures. The RF2174 includes temperature compensation circuits in the bias network to stabilize the RF transistors, thus limiting the current through the amplifier and protecting the devices from damage. The same mec ...
... any RF device. High currents lead to high channel temperatures and may force early failures. The RF2174 includes temperature compensation circuits in the bias network to stabilize the RF transistors, thus limiting the current through the amplifier and protecting the devices from damage. The same mec ...
Diesel-electric Drives Diesel
... there will be sufficient power to operate the vessel safely. Reduced vulnerability to single point of failure providing the basis to fulfill high redundancy requirements. Reduced life cycle cost, resulting from lower operational and maintenance costs. Improved manoeuvrabilty and station-keeping abil ...
... there will be sufficient power to operate the vessel safely. Reduced vulnerability to single point of failure providing the basis to fulfill high redundancy requirements. Reduced life cycle cost, resulting from lower operational and maintenance costs. Improved manoeuvrabilty and station-keeping abil ...
Comparison of low voltage AC and DC power grids
... of computer power supplies, lamp drivers and other appliances. Electricity is supplied over an AC power cable to these applications. Alternatively, rectifier modules can be located at the public grid access of buildings and electricity can be transferred locally by 380 V DC grids. Figure 1 compares ...
... of computer power supplies, lamp drivers and other appliances. Electricity is supplied over an AC power cable to these applications. Alternatively, rectifier modules can be located at the public grid access of buildings and electricity can be transferred locally by 380 V DC grids. Figure 1 compares ...
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... 6. Write down the expression for the average output voltage for step down and step up chopper. Average output voltage for step down chopper is VO = VS. Average output voltage for step up chopper is VO = VS x [1/ ( 1- )]. 7. What are the different types of chopper with respect to commutation proce ...
... 6. Write down the expression for the average output voltage for step down and step up chopper. Average output voltage for step down chopper is VO = VS. Average output voltage for step up chopper is VO = VS x [1/ ( 1- )]. 7. What are the different types of chopper with respect to commutation proce ...
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... In present days the distribution system is facing the problems mainly with voltage dips and voltage sags. The increasing use of electronics in daily activities creates problem of power quality. The term Voltage dip is defined as, a short term reduction in, or complete loss of RMS voltage Simply the ...
... In present days the distribution system is facing the problems mainly with voltage dips and voltage sags. The increasing use of electronics in daily activities creates problem of power quality. The term Voltage dip is defined as, a short term reduction in, or complete loss of RMS voltage Simply the ...
recognization and reduction of source current harmonics in a loaded
... for both linear and non linear load. The advantages of this system are that the line drop and line losses are reduced by introducing active filter. The scope of the present work is to reduce the current harmonic THD by using Active filter and PI controller. This proposed control scheme will be very ...
... for both linear and non linear load. The advantages of this system are that the line drop and line losses are reduced by introducing active filter. The scope of the present work is to reduce the current harmonic THD by using Active filter and PI controller. This proposed control scheme will be very ...
Aalborg Universitet Reactive Power Injection Strategies for Single-Phase Photovoltaic Systems
... electricity generation in most countries, when compared to other renewable systems, e.g. wind turbine power systems. Thus, single-phase configurations are more common for PV applications with lower power ratings (e.g. several kW), and are typically connected to low-voltage networks. Meanwhile, it is ...
... electricity generation in most countries, when compared to other renewable systems, e.g. wind turbine power systems. Thus, single-phase configurations are more common for PV applications with lower power ratings (e.g. several kW), and are typically connected to low-voltage networks. Meanwhile, it is ...
A2000 Multifunctional Power Meter
... The measuring instrument acquires instantaneous values for starconnected voltages and currents at three-phase electrical systems. If no neutral is available, the instrument automatically creates a virtual neutral point. The speed at which measured values are logged depends upon the respective line f ...
... The measuring instrument acquires instantaneous values for starconnected voltages and currents at three-phase electrical systems. If no neutral is available, the instrument automatically creates a virtual neutral point. The speed at which measured values are logged depends upon the respective line f ...
A New Method Voltage and Frequency Regulation of Self
... Specially, the later feature promotes the choice of the induction generator to operate in discarded areas where the extension of the grid is usually expensive, difficult and unreliable. When it is connected to the grid, the induction generator can obtain its necessary reactive power from it. Further ...
... Specially, the later feature promotes the choice of the induction generator to operate in discarded areas where the extension of the grid is usually expensive, difficult and unreliable. When it is connected to the grid, the induction generator can obtain its necessary reactive power from it. Further ...
UC2852 数据资料 dataSheet 下载
... The UC1852 provides a low-cost solution to active power-factor correction (PFC) for systems that would otherwise draw high peak current pulses from AC power lines. This circuit implements zero-current switched boost conversion, producing sinusoidal input currents with a minimum of external component ...
... The UC1852 provides a low-cost solution to active power-factor correction (PFC) for systems that would otherwise draw high peak current pulses from AC power lines. This circuit implements zero-current switched boost conversion, producing sinusoidal input currents with a minimum of external component ...
Power factor
In electrical engineering, the power factor of an AC electrical power system is defined as the ratio of the real power flowing to the load to the apparent power in the circuit, and is a dimensionless number in the closed interval of -1 to 1. A power factor of less than one means that the voltage and current waveforms are not in phase, reducing the instantaneous product of the two waveforms (V x I). Real power is the capacity of the circuit for performing work in a particular time. Apparent power is the product of the current and voltage of the circuit. Due to energy stored in the load and returned to the source, or due to a non-linear load that distorts the wave shape of the current drawn from the source, the apparent power will be greater than the real power. A negative power factor occurs when the device (which is normally the load) generates power, which then flows back towards the source, which is normally considered the generator.In an electric power system, a load with a low power factor draws more current than a load with a high power factor for the same amount of useful power transferred. The higher currents increase the energy lost in the distribution system, and require larger wires and other equipment. Because of the costs of larger equipment and wasted energy, electrical utilities will usually charge a higher cost to industrial or commercial customers where there is a low power factor.Linear loads with low power factor (such as induction motors) can be corrected with a passive network of capacitors or inductors. Non-linear loads, such as rectifiers, distort the current drawn from the system. In such cases, active or passive power factor correction may be used to counteract the distortion and raise the power factor. The devices for correction of the power factor may be at a central substation, spread out over a distribution system, or built into power-consuming equipment.