Residual Current Protective Devices / Arc Fault Detection Devices SENTRON
... Frequency converters, medical devices and UPS systems are seeing increasing use in industry. Smooth DC residual currents or currents with low residual ripple may occur in the event of faults on these devices. Type A residual current protective devices are unable to detect these smooth DC residual cu ...
... Frequency converters, medical devices and UPS systems are seeing increasing use in industry. Smooth DC residual currents or currents with low residual ripple may occur in the event of faults on these devices. Type A residual current protective devices are unable to detect these smooth DC residual cu ...
control of harmonics in electrical power systems
... Foreword Harmonics (or distortion in wave form) has always existed in electrical power systems. It is harmless as long as its level is not substantial. However, with the recent rapid advancement of power electronics technology, so-called nonlinear loads, such as variable frequency drives for motor ...
... Foreword Harmonics (or distortion in wave form) has always existed in electrical power systems. It is harmless as long as its level is not substantial. However, with the recent rapid advancement of power electronics technology, so-called nonlinear loads, such as variable frequency drives for motor ...
SIMULATIONS AND PRACTICAL DESIGNS OF FLYBACK
... Given the 100 V input source, the switch jumps to around 200 V and stays there until the next on-time event. The rest of the waveforms are similar to those obtained with a buck-boost converter operated in CCM. Calculating the average value of the input current will lead us to a very useful design eq ...
... Given the 100 V input source, the switch jumps to around 200 V and stays there until the next on-time event. The rest of the waveforms are similar to those obtained with a buck-boost converter operated in CCM. Calculating the average value of the input current will lead us to a very useful design eq ...
Earth fault current distribution on transmission networks
... the fault current (more or less 30-40 %) from the fault point, which depends on the overhead earth wire type, tower footing resistances of adjacent pylons and it also reduces the total earth substation impedance which yields a reducing of the EPR (Earth Potential Rise) in case of fault at a high vol ...
... the fault current (more or less 30-40 %) from the fault point, which depends on the overhead earth wire type, tower footing resistances of adjacent pylons and it also reduces the total earth substation impedance which yields a reducing of the EPR (Earth Potential Rise) in case of fault at a high vol ...
Design and construction of a numerical over current relay
... transmission lines are required to be protected by comprehensive and quite involved protective schemes so that the power interruption are reduced to minimum with regard the times of interruption and the area are affected since this sector is an important area as well as high expense in required for ...
... transmission lines are required to be protected by comprehensive and quite involved protective schemes so that the power interruption are reduced to minimum with regard the times of interruption and the area are affected since this sector is an important area as well as high expense in required for ...
LTM4600 - 10A High Efficiency DC/DC uModule
... Pulling the RUN/SS pin low forces the controller into its shutdown state, turning off both Q1 and Q2. Releasing the pin allows an internal 1.2μA current source to charge up the softstart capacitor. When this voltage reaches 1.5V, the controller turns on and begins switching. At low load current the ...
... Pulling the RUN/SS pin low forces the controller into its shutdown state, turning off both Q1 and Q2. Releasing the pin allows an internal 1.2μA current source to charge up the softstart capacitor. When this voltage reaches 1.5V, the controller turns on and begins switching. At low load current the ...
IEEE Draft Guide for the Specification of Fixed Series Capacitor
... This document is an unapproved draft of a proposed IEEE Standard. As such, this document is subject to change. USE AT YOUR OWN RISK! Because this is an unapproved draft, this document must not be utilized for any conformance/compliance purposes. Permission is hereby granted for IEEE Standards Commit ...
... This document is an unapproved draft of a proposed IEEE Standard. As such, this document is subject to change. USE AT YOUR OWN RISK! Because this is an unapproved draft, this document must not be utilized for any conformance/compliance purposes. Permission is hereby granted for IEEE Standards Commit ...
A Constant ON-Time 3-Level Buck Converter for Low Power
... COT valley current mode controller, which is the center of the control scheme. The efficiency of the 3-level buck converter was measured and ranges from 82% to 95% at 100 mW and 5000 mW, respectively. The transient response of the converter shows no overshoot due to a 500 mA load step up or down, an ...
... COT valley current mode controller, which is the center of the control scheme. The efficiency of the 3-level buck converter was measured and ranges from 82% to 95% at 100 mW and 5000 mW, respectively. The transient response of the converter shows no overshoot due to a 500 mA load step up or down, an ...
VS-UFB280FA20 Insulated Ultrafast Rectifier Module, 280 A
... PdREV = Inverse power loss = VR1 x IR (1 - D); IR at VR1 = 80 % rated VR ...
... PdREV = Inverse power loss = VR1 x IR (1 - D); IR at VR1 = 80 % rated VR ...
national transmission
... tubes in the boiler. The boiler will be shut down, and the tubes allowed cooling and draining. Thus we have in effect eliminated two hazards. They are: The heat, and The pressurized water in the tubes Now other hazards may still remain but we eliminated those that were practical to eliminate. Ok ...
... tubes in the boiler. The boiler will be shut down, and the tubes allowed cooling and draining. Thus we have in effect eliminated two hazards. They are: The heat, and The pressurized water in the tubes Now other hazards may still remain but we eliminated those that were practical to eliminate. Ok ...
Electronic DC Transformer with High Power Density
... Prof. dr. J.A. Ferreira, Technische Universiteit Delft, promotor Ir. S.W.H. de Haan, Technische Universiteit Delft, toegevoegd promotor Prof. dr. ir. R.W. de Doncker, Aachen University of Technology, Germany Doc. ing. J. Dudrik PhD, Technical University of Kosice, Slovakia Prof. ir. M. Antal, Techni ...
... Prof. dr. J.A. Ferreira, Technische Universiteit Delft, promotor Ir. S.W.H. de Haan, Technische Universiteit Delft, toegevoegd promotor Prof. dr. ir. R.W. de Doncker, Aachen University of Technology, Germany Doc. ing. J. Dudrik PhD, Technical University of Kosice, Slovakia Prof. ir. M. Antal, Techni ...
Using 650-V High Speed 3 IGBTs in Power Modules for... ter Performance Improvement
... stray inductance of the setup for equal switching parameters. The equal switching parameters were realized by modifying RG in the way that di/dt = 1.5 kA/µs and dv/dt = 7.2 kV/µs for VDC = 400 V and di/dt = 1.6 kA/µs and dv/dt = 6.0 kV/µs for VDC = 300 V were set during turnon and turn-off, respecti ...
... stray inductance of the setup for equal switching parameters. The equal switching parameters were realized by modifying RG in the way that di/dt = 1.5 kA/µs and dv/dt = 7.2 kV/µs for VDC = 400 V and di/dt = 1.6 kA/µs and dv/dt = 6.0 kV/µs for VDC = 300 V were set during turnon and turn-off, respecti ...
High Voltage Engineering Practice and Theory
... polymers are also used to support the high voltage conductors. Transformers and other equipment use mineral oil, either on its own or in combination with linen or paper. In a properly designed system the above mentioned insulation systems should be able to perform reliably under normal voltage condi ...
... polymers are also used to support the high voltage conductors. Transformers and other equipment use mineral oil, either on its own or in combination with linen or paper. In a properly designed system the above mentioned insulation systems should be able to perform reliably under normal voltage condi ...
PLANNING LEVELS FOR HARMONIC VOLTAGE DISTORTION
... Summary of THD Planning Levels .................................................................. .9 Planning Levels for Harmonic Voltages in 400V Systems .............................. 10 Planning Levels for Harmonic Voltages in 6.6kV, 11kV, and 20kV Systems .. 10 Planning Levels for Harmonic Volta ...
... Summary of THD Planning Levels .................................................................. .9 Planning Levels for Harmonic Voltages in 400V Systems .............................. 10 Planning Levels for Harmonic Voltages in 6.6kV, 11kV, and 20kV Systems .. 10 Planning Levels for Harmonic Volta ...
Stepper motor
A stepper motor or step motor or stepping motor is a brushless DC electric motor that divides a full rotation into a number of equal steps. The motor's position can then be commanded to move and hold at one of these steps without any feedback sensor (an open-loop controller), as long as the motor is carefully sized to the application in respect to torque and speed.Switched reluctance motors are very large stepping motors with a reduced pole count, and generally are closed-loop commutated.