Transformerless UPS : Concepts and Capabilities
... security, and should not be depended on as a safety feature • Battery terminals should be treated with the same caution and respect given to any AC terminal in the system If a UPS only has an input transformer, then the battery is not floating • An output transformer is required to isolate the batte ...
... security, and should not be depended on as a safety feature • Battery terminals should be treated with the same caution and respect given to any AC terminal in the system If a UPS only has an input transformer, then the battery is not floating • An output transformer is required to isolate the batte ...
Power system considerations for cell tower applications
... rated full load amp (FLA) output of 3-phase motors, and up to 12 times the FLA for single-phase motors. Similarly, the alternator also needs to meet the steadystate reactive power requirements of all other loads in the BTS. This requirement explains why the alternator is typically oversized by about ...
... rated full load amp (FLA) output of 3-phase motors, and up to 12 times the FLA for single-phase motors. Similarly, the alternator also needs to meet the steadystate reactive power requirements of all other loads in the BTS. This requirement explains why the alternator is typically oversized by about ...
TechTopics No. 20 - Power factor correction capacitor
... the motor when the motor is switched off. At the instant that the motor is switched off, the motor and the driven load are at full speed. When the motor is switched off, the motor and load inertia will continue to drive the motor. If the magnetizing current required by the motor is available from th ...
... the motor when the motor is switched off. At the instant that the motor is switched off, the motor and the driven load are at full speed. When the motor is switched off, the motor and load inertia will continue to drive the motor. If the magnetizing current required by the motor is available from th ...
SMJE 2103 Electiral Power System
... (a) If the power system is exactly as described above in Figure (a), what will the voltage at the load be? What will the transmission line losses be? (b) Suppose a 1:10 step-up transformer is placed at the generator end of the transmission line and a 10:1 step-down transformer is placed at the load ...
... (a) If the power system is exactly as described above in Figure (a), what will the voltage at the load be? What will the transmission line losses be? (b) Suppose a 1:10 step-up transformer is placed at the generator end of the transmission line and a 10:1 step-down transformer is placed at the load ...
CLAS12 Drift Chamber Electronics
... Discriminator stage not shown, but typical discriminator setting is 30mV ...
... Discriminator stage not shown, but typical discriminator setting is 30mV ...
DIP SWITCH ADJUSTMENT Multifunction timer ZMR , ZMRS, ZMRV
... Flasher beginning with pause (and immediate-contact) : To activate immediate-contact function on ZMR devices, B1/B2 has to be bridged. To activate immediate-contact function on ZMRV devices, voltage has to be applied on terminal B1. Timing begins with the connection of the power supply to the termin ...
... Flasher beginning with pause (and immediate-contact) : To activate immediate-contact function on ZMR devices, B1/B2 has to be bridged. To activate immediate-contact function on ZMRV devices, voltage has to be applied on terminal B1. Timing begins with the connection of the power supply to the termin ...
555 Timer As Mono Stable Multi Vibrator
... connects pin 7 (discharge) to ground when it is closed. ...
... connects pin 7 (discharge) to ground when it is closed. ...
IOSR Journal of Electrical and Electronics Engineering (IOSR-JEEE) e-ISSN: 2278-1676,p-ISSN: 2320-3331
... on the superposition theorem and the feedback linearization technique, a controller is designed to independently regulate the positive and negative sequence currents of the PMSG voltage source converters (VSC), overcoming several drawbacks of existing approaches in the presence of unbalanced voltage ...
... on the superposition theorem and the feedback linearization technique, a controller is designed to independently regulate the positive and negative sequence currents of the PMSG voltage source converters (VSC), overcoming several drawbacks of existing approaches in the presence of unbalanced voltage ...
Testing of Low Voltage Installations
... Earthed Equipotential Bonding & Automatic Disconnection of Supply (EEBADS) – An established practice in Hong Kong – Earthed Equipotential Bonding • TT - when l.v. supply is given directly by the supply company • TN-S - allowed only when the supply transformer is owned by the ...
... Earthed Equipotential Bonding & Automatic Disconnection of Supply (EEBADS) – An established practice in Hong Kong – Earthed Equipotential Bonding • TT - when l.v. supply is given directly by the supply company • TN-S - allowed only when the supply transformer is owned by the ...
Types of resistors
... The narrow superstrips, which have two vertical sets of holes, are connected so that all holes lying on the same vertical line are connected to each other, i.e., horizontally adjacent holes are not connected to each other. The two wide superstrips, which have five horizontal sets of holes, are conne ...
... The narrow superstrips, which have two vertical sets of holes, are connected so that all holes lying on the same vertical line are connected to each other, i.e., horizontally adjacent holes are not connected to each other. The two wide superstrips, which have five horizontal sets of holes, are conne ...
Electronics IEEE Projects
... diode. For a particular type of SCRs, Vg-Ig characteristic has a spread between two curves 1 and 2 as shown in Fig. 4 This spread, or scatter, of gate characteristics is due to difference in the low doping levels of p and n layers. The gate trigger circuitry must be suitably designed to take care of ...
... diode. For a particular type of SCRs, Vg-Ig characteristic has a spread between two curves 1 and 2 as shown in Fig. 4 This spread, or scatter, of gate characteristics is due to difference in the low doping levels of p and n layers. The gate trigger circuitry must be suitably designed to take care of ...
MCE380 handout - Cleveland State University
... Analog-to-Digital Conversion Principles In ADC we take a sample of an analog voltage and represent it using the available number of bits. ADC converters usually require a sample-and-hold (S&H) circuit at their input. The S&H captures the voltage and holds it constant for the converter to carry its ...
... Analog-to-Digital Conversion Principles In ADC we take a sample of an analog voltage and represent it using the available number of bits. ADC converters usually require a sample-and-hold (S&H) circuit at their input. The S&H captures the voltage and holds it constant for the converter to carry its ...
Compact, Low-Loss, Wideband, and High-Power Handling Phase Shifters With Piezoelectric
... [9]–[12]. With the introduction of the dielectric perturber that is closely placed above a microstrip transmission line, the characteristic impedance of the line is only slightly altered, while its effective dielectric constant can be changed significantly, which leads to phase shift. However, such ...
... [9]–[12]. With the introduction of the dielectric perturber that is closely placed above a microstrip transmission line, the characteristic impedance of the line is only slightly altered, while its effective dielectric constant can be changed significantly, which leads to phase shift. However, such ...
neutral grounding resistors
... ground fault current to a high level (typically 50 amps or more) in order to operate protective fault clearing relays and current transformers. These devices are then able to quickly clear the fault, usually within a few seconds. The importance of this fast response time is that it: ...
... ground fault current to a high level (typically 50 amps or more) in order to operate protective fault clearing relays and current transformers. These devices are then able to quickly clear the fault, usually within a few seconds. The importance of this fast response time is that it: ...
Courseware Sample Electric Power / Controls 25986-F0
... In a DC circuit, with a resistance load, as the voltage across the resistor increases, the current through the resistor increases. This is also true in an AC circuit with a resistance load. If a sinusoidal voltage e is applied across a resistor R, the instantaneous variations of current i through R ...
... In a DC circuit, with a resistance load, as the voltage across the resistor increases, the current through the resistor increases. This is also true in an AC circuit with a resistance load. If a sinusoidal voltage e is applied across a resistor R, the instantaneous variations of current i through R ...
PLM 10000Q
... extensive networks of powered loudspeaker management systems from a single computer. The user interface is based on discrete processing modules, with each module assigned to power outputs normally defined for sets of band-limited drivers (e.g. low, mid, high, subs). Adjustments can be made in real t ...
... extensive networks of powered loudspeaker management systems from a single computer. The user interface is based on discrete processing modules, with each module assigned to power outputs normally defined for sets of band-limited drivers (e.g. low, mid, high, subs). Adjustments can be made in real t ...
MJD44H11
... Resale of ST products with provisions different from the statements and/or technical features set forth in this document shall immediately void any warranty granted by ST for the ST product or service described herein and shall not create or extend in any manner whatsoever, any liability of ST. ...
... Resale of ST products with provisions different from the statements and/or technical features set forth in this document shall immediately void any warranty granted by ST for the ST product or service described herein and shall not create or extend in any manner whatsoever, any liability of ST. ...
Evaluates: MAX16835/MAX16836 MAX16836 Evaluation Kit General Description Features
... on the MAX16836 current regulator. The MAX16836 EV kit is capable of supplying regulated output currents of up to 350mA and runs at supply voltages between 6.5V to 40V. If the supply voltage is above the LED operating voltage by more than 7V, the maximum output current should be limited to prevent t ...
... on the MAX16836 current regulator. The MAX16836 EV kit is capable of supplying regulated output currents of up to 350mA and runs at supply voltages between 6.5V to 40V. If the supply voltage is above the LED operating voltage by more than 7V, the maximum output current should be limited to prevent t ...
1 Purpose and scope 2 Power supply systems
... for the primary power supply backup with UPS only may be accepted. The battery capacity shall in these circumstances be dimensioned for full load in 8 hours. c) The performance of the UPS-facility shall be dimensioned and matched to the size and type of load. Special care should be paid for loads wi ...
... for the primary power supply backup with UPS only may be accepted. The battery capacity shall in these circumstances be dimensioned for full load in 8 hours. c) The performance of the UPS-facility shall be dimensioned and matched to the size and type of load. Special care should be paid for loads wi ...
Three-phase electric power
Three-phase electric power is a common method of alternating-current electric power generation, transmission, and distribution. It is a type of polyphase system and is the most common method used by electrical grids worldwide to transfer power. It is also used to power large motors and other heavy loads. A three-phase system is usually more economical than an equivalent single-phase or two-phase system at the same line to ground voltage because it uses less conductor material to transmit electrical power.The three-phase system was independently invented by Galileo Ferraris, Mikhail Dolivo-Dobrovolsky, Jonas Wenström and Nikola Tesla in the late 1880s.