Short-circuit current rating (SCCR) of industrial control panels
... A device that, when interrupting currents in its current limiting range, reduces the current flowing in the faulted circuit to a magnitude substantially less than that obtainable in the same circuit if the device were replaced with a solid conductor having comparable impedance. Feeder Circuit The co ...
... A device that, when interrupting currents in its current limiting range, reduces the current flowing in the faulted circuit to a magnitude substantially less than that obtainable in the same circuit if the device were replaced with a solid conductor having comparable impedance. Feeder Circuit The co ...
DEPARTMENT OF ELECTRICAL ENGINEERING
... I. Overview of Department of Electrical Engineering The Electrical Engineering (EE) department is part of the School of Engineering (SoE) at SNU. Its vision is to be a catalyst in imparting quality education and conducting valued research for the benefit of society. Historically, the field of elect ...
... I. Overview of Department of Electrical Engineering The Electrical Engineering (EE) department is part of the School of Engineering (SoE) at SNU. Its vision is to be a catalyst in imparting quality education and conducting valued research for the benefit of society. Historically, the field of elect ...
HMC597LP4 / 597LP4E
... The circuit board used in the final application should use RF circuit design techniques. Signal lines should have 50 ohm impedance while the package ground leads and exposed paddle should be connected directly to the ground plane similar to that shown. A sufficient number of via holes should be used ...
... The circuit board used in the final application should use RF circuit design techniques. Signal lines should have 50 ohm impedance while the package ground leads and exposed paddle should be connected directly to the ground plane similar to that shown. A sufficient number of via holes should be used ...
Technical Notes
... other benefits in assuring that the drive will operate in its installation environment while neither causing nor experiencing electromagnetic interference (EMI). EMI is any interference with normal equipment operation caused by abnormal energy entering equipment either by conduction though wiring co ...
... other benefits in assuring that the drive will operate in its installation environment while neither causing nor experiencing electromagnetic interference (EMI). EMI is any interference with normal equipment operation caused by abnormal energy entering equipment either by conduction though wiring co ...
MAX8860 低噪声、低压差300mA (确保)稳压器，µMAX封装
... this reference to the selected feedback voltage and amplifies the difference. The MOSFET driver reads the error signal and applies the appropriate drive to the Pchannel pass transistor. If the feedback voltage is lower than the reference voltage, the pass-transistor gate is pulled lower, allowing mo ...
... this reference to the selected feedback voltage and amplifies the difference. The MOSFET driver reads the error signal and applies the appropriate drive to the Pchannel pass transistor. If the feedback voltage is lower than the reference voltage, the pass-transistor gate is pulled lower, allowing mo ...
Full-text
... operation waveforms as well as basic expressions for the calculation of currents and voltages are proposed. A 1500 W laboratory prototype was built and experimentally verified at two operation points: that of light-load (300 W) and full-load (1500 W). All the experiments were also carried with reson ...
... operation waveforms as well as basic expressions for the calculation of currents and voltages are proposed. A 1500 W laboratory prototype was built and experimentally verified at two operation points: that of light-load (300 W) and full-load (1500 W). All the experiments were also carried with reson ...
Bus Protection - GE Grid Solutions
... To prevent differential-relay operation should a CT open-circuit, the relay pickup is often made no less than about twice the load current of the most heavily loaded circuit; 8 if the magnitude of groundfault current is sufficiently limited by neutral-grounding impedance, lower pickup may be require ...
... To prevent differential-relay operation should a CT open-circuit, the relay pickup is often made no less than about twice the load current of the most heavily loaded circuit; 8 if the magnitude of groundfault current is sufficiently limited by neutral-grounding impedance, lower pickup may be require ...
AN2132
... ring mode without load. The VBAT value must be chosen taking into account the absolute maximum ratings of the device (VBTOT = 90 V). VBTOT = (VBAT + VPOS) = 90 V must not be exceeded. When ring mode is selected through the control interface, the VBAT voltage is increased by an internal circuit from ...
... ring mode without load. The VBAT value must be chosen taking into account the absolute maximum ratings of the device (VBTOT = 90 V). VBTOT = (VBAT + VPOS) = 90 V must not be exceeded. When ring mode is selected through the control interface, the VBAT voltage is increased by an internal circuit from ...
Dc Microgrids Stability
... reduced stiffness when operating in islanded mode. General solutions involve the use of energy storage devices and/or load management (e.g. load shedding). • milliseconds to seconds: • Mostly a power quality issue that without a quick correction may usually lead to loss of stability ...
... reduced stiffness when operating in islanded mode. General solutions involve the use of energy storage devices and/or load management (e.g. load shedding). • milliseconds to seconds: • Mostly a power quality issue that without a quick correction may usually lead to loss of stability ...
Basis for Kelvin Contacts
... A common application of Kelvin sockets is to allow accurate measurement of low resistance. An example of this is the need to measure the low RDS-ON values (resistance between drain and source leads when the transistor is “on”) in a MOSFET. These values can be as low as 1 milliohm, which requires a K ...
... A common application of Kelvin sockets is to allow accurate measurement of low resistance. An example of this is the need to measure the low RDS-ON values (resistance between drain and source leads when the transistor is “on”) in a MOSFET. These values can be as low as 1 milliohm, which requires a K ...
Important Principle:
... This usually means connecting a balanced load such as a dipole antenna to an unbalanced input such as a 50ohm coaxial cable. The shield side of the cable is usually grounded. ...
... This usually means connecting a balanced load such as a dipole antenna to an unbalanced input such as a 50ohm coaxial cable. The shield side of the cable is usually grounded. ...
Siemens STEP 2000 Course
... power from the utility company is metered and enters the plant through a distribution switchboard. The switchboard serves as the main disconnecting means. The feeder on the left feeds a distribution switchboard, which in turn feeds a panelboard and a 480 volt, three-phase, three-wire (3Ø3W) motor. T ...
... power from the utility company is metered and enters the plant through a distribution switchboard. The switchboard serves as the main disconnecting means. The feeder on the left feeds a distribution switchboard, which in turn feeds a panelboard and a 480 volt, three-phase, three-wire (3Ø3W) motor. T ...
TAP 118- 1: Potential dividers
... It may be helpful to give a demonstration of a resistive sensor being used to turn some device on or off, as a way of giving point to the work. These experiments can be kept simple by using rather high resistances and high impedance digital voltmeters. They will not be a success using low impedance ...
... It may be helpful to give a demonstration of a resistive sensor being used to turn some device on or off, as a way of giving point to the work. These experiments can be kept simple by using rather high resistances and high impedance digital voltmeters. They will not be a success using low impedance ...
File
... Transformer Classification • Transformers are allocated symbols which indicate the type of cooling used • Can consist of up to 4 letters indicating the cooling system ...
... Transformer Classification • Transformers are allocated symbols which indicate the type of cooling used • Can consist of up to 4 letters indicating the cooling system ...
INTRODUCTION - KFUPM Faculty List
... The double terminals methods are that fault point is determined by accurately time tagging the arrival of traveling wave at each end of the line. This method depends less on grounding resistance and system running-way, etc... This method is used widely. The velocity is determined by the distributed ...
... The double terminals methods are that fault point is determined by accurately time tagging the arrival of traveling wave at each end of the line. This method depends less on grounding resistance and system running-way, etc... This method is used widely. The velocity is determined by the distributed ...
Model of Voltage Source Inverter for Estimation Methods with
... appropriate to measure stator currents just before entry into the current control loop algorithm. Then actual data are at disposal. The stator voltages can be estimated direct or indirect. The direct measurement requires high quality voltage sensors. At indirect method, there is used simpler voltage ...
... appropriate to measure stator currents just before entry into the current control loop algorithm. Then actual data are at disposal. The stator voltages can be estimated direct or indirect. The direct measurement requires high quality voltage sensors. At indirect method, there is used simpler voltage ...
Technical information for micro switches
... short-circuiting, open-circuiting and temperature rises. If this switch is to be used in equipment where safety is a prime consideration, examine the possible effects of these failures on the equipment concerned, and ensure safety by providing protection circuits or protection devices. In terms of t ...
... short-circuiting, open-circuiting and temperature rises. If this switch is to be used in equipment where safety is a prime consideration, examine the possible effects of these failures on the equipment concerned, and ensure safety by providing protection circuits or protection devices. In terms of t ...
AND8230 - Application Hints for Transient Voltage
... are trademarks of Semiconductor Components Industries, LLC dba ON Semiconductor or its subsidiaries in the United States and/or other countries. ON Semiconductor owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property. A listing of ON Semiconduc ...
... are trademarks of Semiconductor Components Industries, LLC dba ON Semiconductor or its subsidiaries in the United States and/or other countries. ON Semiconductor owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property. A listing of ON Semiconduc ...
University Improves Sustainability of HVAC Motors in
... The cumulative bearing damage caused by VFD-induced shaft voltages and resulting bearing currents is often overlooked until it is too late to save the motor. The high peak voltages and extremely fast voltage rise times (dv/dt) associated with the insulated gate bipolar transistors (IGBTs) found in t ...
... The cumulative bearing damage caused by VFD-induced shaft voltages and resulting bearing currents is often overlooked until it is too late to save the motor. The high peak voltages and extremely fast voltage rise times (dv/dt) associated with the insulated gate bipolar transistors (IGBTs) found in t ...
Ground (electricity)
In electrical engineering, ground or earth is the reference point in an electrical circuit from which voltages are measured, a common return path for electric current, or a direct physical connection to the Earth.Electrical circuits may be connected to ground (earth) for several reasons. In mains powered equipment, exposed metal parts are connected to ground to prevent user contact with dangerous voltage if electrical insulation fails. Connections to ground limit the build-up of static electricity when handling flammable products or electrostatic-sensitive devices. In some telegraph and power transmission circuits, the earth itself can be used as one conductor of the circuit, saving the cost of installing a separate return conductor (see single-wire earth return).For measurement purposes, the Earth serves as a (reasonably) constant potential reference against which other potentials can be measured. An electrical ground system should have an appropriate current-carrying capability to serve as an adequate zero-voltage reference level. In electronic circuit theory, a ""ground"" is usually idealized as an infinite source or sink for charge, which can absorb an unlimited amount of current without changing its potential. Where a real ground connection has a significant resistance, the approximation of zero potential is no longer valid. Stray voltages or earth potential rise effects will occur, which may create noise in signals or if large enough will produce an electric shock hazard.The use of the term ground (or earth) is so common in electrical and electronics applications that circuits in portable electronic devices such as cell phones and media players as well as circuits in vehicles may be spoken of as having a ""ground"" connection without any actual connection to the Earth, despite ""common"" being a more appropriate term for such a connection. This is usually a large conductor attached to one side of the power supply (such as the ""ground plane"" on a printed circuit board) which serves as the common return path for current from many different components in the circuit.