Limiting short-circuit currents in medium-voltage
... 33kV or higher, and then to step the voltage back down with substation transformers in order to supply the loads. These step-up and step-down transformers together with the additional switchgear for their protection greatly increased the amount of space required for the installation of the electrica ...
... 33kV or higher, and then to step the voltage back down with substation transformers in order to supply the loads. These step-up and step-down transformers together with the additional switchgear for their protection greatly increased the amount of space required for the installation of the electrica ...
Advances in Environmental Biology
... of unbalance voltage on operation of adjustable speed drives (ASDs) and induction motors are introduces and simulated. Also as an effective method for mitigating the intensity of unbalanced voltage on ASD, the idea of replacing the diode rectifier with an active PWM rectifier in investigated. Since ...
... of unbalance voltage on operation of adjustable speed drives (ASDs) and induction motors are introduces and simulated. Also as an effective method for mitigating the intensity of unbalanced voltage on ASD, the idea of replacing the diode rectifier with an active PWM rectifier in investigated. Since ...
Spark Plugs Do Tell A Story! Spark Plugs
... In standard ignition, the contact set is attached to the movable breaker plate. A vacuum advance unit attached to the distributor housing is mounted under the breaker plate. The rotor covers the centrifugal advance mechanism, which consists of a cam actuated by two centrifugal weights. As the breake ...
... In standard ignition, the contact set is attached to the movable breaker plate. A vacuum advance unit attached to the distributor housing is mounted under the breaker plate. The rotor covers the centrifugal advance mechanism, which consists of a cam actuated by two centrifugal weights. As the breake ...
5V and 3.3V Hot Swap Controller Reference Design
... • Wait for 5V and 3.3V input rails to stabilize after contact bounce using Timer 1 • Enable hot-swap operation, operate MOSFETs in SOA • Wait for 5V and 3.3V output from the MOSFET to reach acceptable levels within short circuit timeout period using Timer 2 • If short circuit timer expires then jump ...
... • Wait for 5V and 3.3V input rails to stabilize after contact bounce using Timer 1 • Enable hot-swap operation, operate MOSFETs in SOA • Wait for 5V and 3.3V output from the MOSFET to reach acceptable levels within short circuit timeout period using Timer 2 • If short circuit timer expires then jump ...
MP6001 - Monolithic Power System
... selection of the transformer (Tr), the output cap, (C2), and the input cap, (C1). The higher the frequency, the smaller the sizes for Tr, C2, and C1. However, a higher frequency also leads to higher AC power losses in the power switch, control circuitry, transformer, and in the external interconnect ...
... selection of the transformer (Tr), the output cap, (C2), and the input cap, (C1). The higher the frequency, the smaller the sizes for Tr, C2, and C1. However, a higher frequency also leads to higher AC power losses in the power switch, control circuitry, transformer, and in the external interconnect ...
Reverse Blocking IGCTs for Current Source
... reduce dynamic losses by lifetime reduction leads to an increase in conduction losses. These drawbacks can be overcome by the series connection of discrete GCT and diode wafers. Since both wafers can be optimised for minimal thickness, their on-state voltage drops versus turn-off losses are very fav ...
... reduce dynamic losses by lifetime reduction leads to an increase in conduction losses. These drawbacks can be overcome by the series connection of discrete GCT and diode wafers. Since both wafers can be optimised for minimal thickness, their on-state voltage drops versus turn-off losses are very fav ...
IMPORTANT SAFETY INSTRUCTION IF 1638 Solar Recombiner, Array Fuse, Disconnect Box
... If no Integral Disconnect Switch is provided one must be utilized in the PV system at time of installation and any conductor not opened through disconnect switch must be grounded during installation. All disconnects to be turned to the OFF position and locked out prior to servicing. ...
... If no Integral Disconnect Switch is provided one must be utilized in the PV system at time of installation and any conductor not opened through disconnect switch must be grounded during installation. All disconnects to be turned to the OFF position and locked out prior to servicing. ...
Inductors and transformers
... The magnetic flux density B may also be expressed in gauss, where 104 gauss = 1 tesla. The earth’s magnetic flux density varies from 0.2 to 0.6 gauss, depending on location. The 60 Hz magnetic flux density in a home or office is usually less than a few milligauss except near a source (electric heater, co ...
... The magnetic flux density B may also be expressed in gauss, where 104 gauss = 1 tesla. The earth’s magnetic flux density varies from 0.2 to 0.6 gauss, depending on location. The 60 Hz magnetic flux density in a home or office is usually less than a few milligauss except near a source (electric heater, co ...
MOSFET Biasing using..
... Note this equation determines the ratio of resistors R1 and R2 , but not the resistors themselves. ...
... Note this equation determines the ratio of resistors R1 and R2 , but not the resistors themselves. ...
Line Conductors
... This topmost wire (or wires) helps to attenuate the transient voltages/currents that arise during a lighting strike. The ground wire is typically grounded at each pole. Corona discharge: Due to high electric fields around lines, the air molecules become ionized. This causes a crackling sound and may ...
... This topmost wire (or wires) helps to attenuate the transient voltages/currents that arise during a lighting strike. The ground wire is typically grounded at each pole. Corona discharge: Due to high electric fields around lines, the air molecules become ionized. This causes a crackling sound and may ...
transformers - Crompton Instruments
... A transformer is a device that transfers electrical energy from one circuit to another by electromagnetic induction (also called transformer action). It is most often used to step up or step down voltage. Occasionally, it is used as an isolating device to eliminate a direct mechanical electrical con ...
... A transformer is a device that transfers electrical energy from one circuit to another by electromagnetic induction (also called transformer action). It is most often used to step up or step down voltage. Occasionally, it is used as an isolating device to eliminate a direct mechanical electrical con ...
Low Voltage Ride-through Capability Enhancement of Doubly Fed
... components of the stator transients induced in the rotor side. The value of the slip generally between -0.3 and 0.3 [18], and from the equation (22)-(24): the positive sequence component is proportional to the slip (s), the negative sequence component is proportional to (2-s) and the DC component is ...
... components of the stator transients induced in the rotor side. The value of the slip generally between -0.3 and 0.3 [18], and from the equation (22)-(24): the positive sequence component is proportional to the slip (s), the negative sequence component is proportional to (2-s) and the DC component is ...
AYA DAC - Audiostereo.pl
... production and tolerances are not small, to choose the right value for this resistor we would have to know the Idss of the used sample. Manufacturers are sometimes helpful making ranges of the certain pieces with regard to the Idss (so we have BF245A, -B and – C, and we have 2SK170GR, -BL and –Y). I ...
... production and tolerances are not small, to choose the right value for this resistor we would have to know the Idss of the used sample. Manufacturers are sometimes helpful making ranges of the certain pieces with regard to the Idss (so we have BF245A, -B and – C, and we have 2SK170GR, -BL and –Y). I ...
LEP 4.4.03 Inductance of solenoids
... As a difference in length also means a difference in the number of turns, the relationship between inductance and number of turns found in Problem 1 must also be used to solve Problem 2. Notes The distance between L1 and L should be as large as possible so that the effect of the excitation coil on t ...
... As a difference in length also means a difference in the number of turns, the relationship between inductance and number of turns found in Problem 1 must also be used to solve Problem 2. Notes The distance between L1 and L should be as large as possible so that the effect of the excitation coil on t ...
Experiment 4
... they range in size from miniature units weighing ounces to huge units weighing tons. All transformers, however, exhibit the same basic properties. When mutual induction is permitted between two coils or windings, a change in current flowing through one coil induces a voltage upon the other coil. All ...
... they range in size from miniature units weighing ounces to huge units weighing tons. All transformers, however, exhibit the same basic properties. When mutual induction is permitted between two coils or windings, a change in current flowing through one coil induces a voltage upon the other coil. All ...
ECE 2115: E
... 1. Measure the IB = 10µA curve. a. Build the circuit depicted in Figure 2.1 using the 2N3904 BJT. b. Measure the exact resistances of RB and RC using the DMM and record these values. c. Use a DMM to measure the voltage at node VB in the circuit. This is VBE. d. Use a DMM to measure the voltage at no ...
... 1. Measure the IB = 10µA curve. a. Build the circuit depicted in Figure 2.1 using the 2N3904 BJT. b. Measure the exact resistances of RB and RC using the DMM and record these values. c. Use a DMM to measure the voltage at node VB in the circuit. This is VBE. d. Use a DMM to measure the voltage at no ...
Electrical 4th Sem
... Note : Examiner will set eight question, taking two from each unit. Students will be required to attempt five questions taking at least one from each unit. ...
... Note : Examiner will set eight question, taking two from each unit. Students will be required to attempt five questions taking at least one from each unit. ...
Joule thief
... region (and opens the collector-emitter “switch”). The magnetic field collapses, inducing however much voltage is necessary to make the load conduct, or for the secondary-winding current to find some other path. When the field is back to zero, the whole sequence repeats; with the battery ramping-up the ...
... region (and opens the collector-emitter “switch”). The magnetic field collapses, inducing however much voltage is necessary to make the load conduct, or for the secondary-winding current to find some other path. When the field is back to zero, the whole sequence repeats; with the battery ramping-up the ...
VF-0 series - Panasonic Electric Works
... Due to vector control, the VF-CE inverter achieves considerably higher torque in comparison to conventional V/f control (maximum torque = 1.8 x MN for 60s) and has low level open-circuit power consumption. This function is particularly useful for drives with strong fluctuating loads or high starting ...
... Due to vector control, the VF-CE inverter achieves considerably higher torque in comparison to conventional V/f control (maximum torque = 1.8 x MN for 60s) and has low level open-circuit power consumption. This function is particularly useful for drives with strong fluctuating loads or high starting ...
Arc-quenching magnetically controlled reactors
... In this mode, current pulses of 1 msec duration are generated by the ACS and propagated into the network through the AQMCR signal winding. The recurrence rate of current pulses depends on reactor power and network conditions, and is between 3 to 10 Hz. Current pulse charges network capacitance, and ...
... In this mode, current pulses of 1 msec duration are generated by the ACS and propagated into the network through the AQMCR signal winding. The recurrence rate of current pulses depends on reactor power and network conditions, and is between 3 to 10 Hz. Current pulse charges network capacitance, and ...
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.