Current-Only Directional Overcurrent Relay
... protection of power transmission systems. Distributionside protection, e.g., for radial and ring-main units [2], mostly employs non-directional relays. Here, a fault generally means an overcurrent [3], mainly from a short circuit. The nondirectional relay typically monitors the overcurrent (from the ...
... protection of power transmission systems. Distributionside protection, e.g., for radial and ring-main units [2], mostly employs non-directional relays. Here, a fault generally means an overcurrent [3], mainly from a short circuit. The nondirectional relay typically monitors the overcurrent (from the ...
AD7352 数据手册DataSheet下载
... reference pin with a 10 μF capacitor. Provided the output is buffered, the on-chip reference can be taken from these pins and applied externally to the rest of the system. The nominal internal reference voltage is 2.048 V and appears at these pins. These pins can also be overdriven by an external re ...
... reference pin with a 10 μF capacitor. Provided the output is buffered, the on-chip reference can be taken from these pins and applied externally to the rest of the system. The nominal internal reference voltage is 2.048 V and appears at these pins. These pins can also be overdriven by an external re ...
ETS80X10.5C - AMETEK Programmable Power
... At the heart of the PV simulator are two 80 MIPS RISC microcontrollers. One processor interfaces with a 16-bit measurement and control system that monitors the output voltage and current at 5 µs intervals. At each interval, the processor sends computed data to its 16-bit D/A control system that adju ...
... At the heart of the PV simulator are two 80 MIPS RISC microcontrollers. One processor interfaces with a 16-bit measurement and control system that monitors the output voltage and current at 5 µs intervals. At each interval, the processor sends computed data to its 16-bit D/A control system that adju ...
EUP3510 Preliminary Current Limited Load Switch
... The EUP3510 is a Current Limited P-channel MOSFET power switch designed for high-side load-switching applications. An integrated current-limiting circuit protects the input supply against large currents which may cause the supply to fall out of regulation. It can be used to control loads that requir ...
... The EUP3510 is a Current Limited P-channel MOSFET power switch designed for high-side load-switching applications. An integrated current-limiting circuit protects the input supply against large currents which may cause the supply to fall out of regulation. It can be used to control loads that requir ...
Distribution Network Capacitor Resonance – A Case
... Harmonics are generally caused by customer non-linear loads interacting with network impedances. Capacitor banks used for voltage support can resonant and cause excessive levels of harmonics that may cause problems for customer equipment. This case study looks at the problems associated with a capac ...
... Harmonics are generally caused by customer non-linear loads interacting with network impedances. Capacitor banks used for voltage support can resonant and cause excessive levels of harmonics that may cause problems for customer equipment. This case study looks at the problems associated with a capac ...
A Cascaded Boost-Buck Converter for High Efficiency Wireless
... occurs when power sources and receiving devices are specially designed magnetic resonators with approximately same natural frequencies, i.e. resonant inductive coupling using the inherent capacitances of the coils [8]. The inductive coupling systems are also usually tuned to resonance but using exte ...
... occurs when power sources and receiving devices are specially designed magnetic resonators with approximately same natural frequencies, i.e. resonant inductive coupling using the inherent capacitances of the coils [8]. The inductive coupling systems are also usually tuned to resonance but using exte ...
1C.4.1—Harmonic Distortion
... Some customers may want rules-of-thumb to help keep their harmonic distortion under control without formal analysis. PacifiCorp suggests that harmonic producing devices used by these customers be limited or filtered at the individual device or equipment level. PacifiCorp’s recommended maximum indivi ...
... Some customers may want rules-of-thumb to help keep their harmonic distortion under control without formal analysis. PacifiCorp suggests that harmonic producing devices used by these customers be limited or filtered at the individual device or equipment level. PacifiCorp’s recommended maximum indivi ...
Definition of the module stray inductance Ls
... Lσ. It is overlayed to the DC link voltage VCC and seen as a voltage spike across the turningoff IGBT1. Permissible limits for turn-off current di/dt and overvoltage can be deduced from the RBSOA diagram of the IGBT. This curve (see Fig.2) is valid when the measurement is done through the CE auxilia ...
... Lσ. It is overlayed to the DC link voltage VCC and seen as a voltage spike across the turningoff IGBT1. Permissible limits for turn-off current di/dt and overvoltage can be deduced from the RBSOA diagram of the IGBT. This curve (see Fig.2) is valid when the measurement is done through the CE auxilia ...
LM1894 Dynamic Noise Reduction System DNR(RM)
... has a variable bandwidth of 1 kHz to 30 kHz, dependent on music spectrum. The DNR system operates on three principles of psychoacoustics. 1. White noise can mask pure tones. The total noise energy required to mask a pure tone must equal the energy of the tone itself. Within certain limits, the wider ...
... has a variable bandwidth of 1 kHz to 30 kHz, dependent on music spectrum. The DNR system operates on three principles of psychoacoustics. 1. White noise can mask pure tones. The total noise energy required to mask a pure tone must equal the energy of the tone itself. Within certain limits, the wider ...
Output Isolation Modules
... N170-Series Output Isolation Modules contain two independent circuits that can be interconnected to create a single, isolated bi-polar output when required by the application. Three versions of this module are available. All three models are controlled by a nominal MicroLok II 12V vital output. Modu ...
... N170-Series Output Isolation Modules contain two independent circuits that can be interconnected to create a single, isolated bi-polar output when required by the application. Three versions of this module are available. All three models are controlled by a nominal MicroLok II 12V vital output. Modu ...
RF3934 120W GaN WIDEBAND POWER AMPLIFIER Features
... capacitances change value as the terminal voltages are varied. RFMD presents the three terminal capacitances measured with the gate pinched off (VGS = -8V) and zero volts applied to the drain. During the measurement process, the parasitic capacitances of the package that holds the amplifier is remov ...
... capacitances change value as the terminal voltages are varied. RFMD presents the three terminal capacitances measured with the gate pinched off (VGS = -8V) and zero volts applied to the drain. During the measurement process, the parasitic capacitances of the package that holds the amplifier is remov ...
Datasheet
... +29dB. This gain can be changed by programming from +22dB to -37dB in 1dB steps. The user can also change the gain via Register VOL (See section "Handsfree"). The receive input is the differential signal of RI and STB. The soft clip circuit limits the output voltage at LO1 of LO2 to 1V p. It prevent ...
... +29dB. This gain can be changed by programming from +22dB to -37dB in 1dB steps. The user can also change the gain via Register VOL (See section "Handsfree"). The receive input is the differential signal of RI and STB. The soft clip circuit limits the output voltage at LO1 of LO2 to 1V p. It prevent ...
Preliminary Detail of Signal Input/Output Terminals
... to 15V 10%. Table 3-1 describes the behavior of this IPM for various control supply voltages. The control supply should be well filtered with a low impedance electrolytic capacitor and a high frequency decoupling capacitor connected right at terminals. High frequency noise on the supply might caus ...
... to 15V 10%. Table 3-1 describes the behavior of this IPM for various control supply voltages. The control supply should be well filtered with a low impedance electrolytic capacitor and a high frequency decoupling capacitor connected right at terminals. High frequency noise on the supply might caus ...
Aalborg Universitet A Novel Harmonic Elimination Approach in Three-Phase Multi-Motor Drives
... (uncontrolled) or thyristor-based rectifiers (phase-controlled) of less complexity and cost are still widely used in Adjustable Speed Drives (ASD). In addition, the undesirable nonlinearity of the conventional AC-DC conversion stage may become significant, when a large number of industrial converter ...
... (uncontrolled) or thyristor-based rectifiers (phase-controlled) of less complexity and cost are still widely used in Adjustable Speed Drives (ASD). In addition, the undesirable nonlinearity of the conventional AC-DC conversion stage may become significant, when a large number of industrial converter ...
Title Coordinated control and energy management of distributed
... of power directly from the distribution grid. With the proliferation of power-electronics equipment being connected to the microgrid, the load currents could be distorted due to the presence of harmonic components. The DG units also function to compensate for any harmonics in the currents drawn by n ...
... of power directly from the distribution grid. With the proliferation of power-electronics equipment being connected to the microgrid, the load currents could be distorted due to the presence of harmonic components. The DG units also function to compensate for any harmonics in the currents drawn by n ...
Type 4 self-contained single beam for access control FF
... done on delivery to shorten time spent on setting up the system. The mechanics of both column and mirrors is designed to fulfill the requirements of the optics, and eases beam alignment adjustment. Moreover, a laser pen can be used to adjust beam alignment quickly. The integrated functions simplify ...
... done on delivery to shorten time spent on setting up the system. The mechanics of both column and mirrors is designed to fulfill the requirements of the optics, and eases beam alignment adjustment. Moreover, a laser pen can be used to adjust beam alignment quickly. The integrated functions simplify ...
A New Zero-Field Paramagnetic Resonance Spectrometer
... be swept until the resonance condition is met. The interpretation of spectra is particularly simple since one may determine energy level splittings directly from the frequency axis, without needing to know the field for resonance at a fixed frequency. In general, the lines are not broadened by inhom ...
... be swept until the resonance condition is met. The interpretation of spectra is particularly simple since one may determine energy level splittings directly from the frequency axis, without needing to know the field for resonance at a fixed frequency. In general, the lines are not broadened by inhom ...
Pulse-width modulation
Pulse-width modulation (PWM), or pulse-duration modulation (PDM), is a modulation technique used to encode a message into a pulsing signal. Although this modulation technique can be used to encode information for transmission, its main use is to allow the control of the power supplied to electrical devices, especially to inertial loads such as motors. In addition, PWM is one of the two principal algorithms used in photovoltaic solar battery chargers, the other being MPPT.The average value of voltage (and current) fed to the load is controlled by turning the switch between supply and load on and off at a fast rate. The longer the switch is on compared to the off periods, the higher the total power supplied to the load.The PWM switching frequency has to be much higher than what would affect the load (the device that uses the power), which is to say that the resultant waveform perceived by the load must be as smooth as possible. Typically switching has to be done several times a minute in an electric stove, 120 Hz in a lamp dimmer, from few kilohertz (kHz) to tens of kHz for a motor drive and well into the tens or hundreds of kHz in audio amplifiers and computer power supplies.The term duty cycle describes the proportion of 'on' time to the regular interval or 'period' of time; a low duty cycle corresponds to low power, because the power is off for most of the time. Duty cycle is expressed in percent, 100% being fully on.The main advantage of PWM is that power loss in the switching devices is very low. When a switch is off there is practically no current, and when it is on and power is being transferred to the load, there is almost no voltage drop across the switch. Power loss, being the product of voltage and current, is thus in both cases close to zero. PWM also works well with digital controls, which, because of their on/off nature, can easily set the needed duty cycle.PWM has also been used in certain communication systems where its duty cycle has been used to convey information over a communications channel.