Recent Developments for Off-Line Testing of Stator Insulation
... When high partial discharge (PD) activity is detected in an on-line test, endusers usually want to verify that there is a problem by performing a visual inspection and/or doing some off-line testing. The traditional off-line DC tests are the insulation resistance (IR) and polarization index (PI) tes ...
... When high partial discharge (PD) activity is detected in an on-line test, endusers usually want to verify that there is a problem by performing a visual inspection and/or doing some off-line testing. The traditional off-line DC tests are the insulation resistance (IR) and polarization index (PI) tes ...
DS3668 - Texas Instruments
... the enable pin low for at least 1.0 µs. This built-in delay is provided to ensure that the protection circuitry is not triggered by turn-on surge currents associated with certain kinds of loads. The DS3668’s inputs combine TTL compatibility with high input impedance. In fact, its extreme low input c ...
... the enable pin low for at least 1.0 µs. This built-in delay is provided to ensure that the protection circuitry is not triggered by turn-on surge currents associated with certain kinds of loads. The DS3668’s inputs combine TTL compatibility with high input impedance. In fact, its extreme low input c ...
Research Article Matrix Converter Based Unified Power Quality
... the matrix converter output terminals to the load side through series transformer and the input side of matrix converter is connected to the supply side with step up transformer. So a matrix converter injects the compensation voltage on the load-side, so it is possible to mitigate the voltage sag/sw ...
... the matrix converter output terminals to the load side through series transformer and the input side of matrix converter is connected to the supply side with step up transformer. So a matrix converter injects the compensation voltage on the load-side, so it is possible to mitigate the voltage sag/sw ...
A Soft-Switching Isolated Bidirectional Converter Fed
... Compared with traditional isolated bidirectional dc–dc converters such as dual active bridge converter, the reverse energy and turn-off loss are reduced dramatically, and the conversion efficiency can be much improved. With the proposed new control scheme, the power flow direction and output power o ...
... Compared with traditional isolated bidirectional dc–dc converters such as dual active bridge converter, the reverse energy and turn-off loss are reduced dramatically, and the conversion efficiency can be much improved. With the proposed new control scheme, the power flow direction and output power o ...
Chapter 2 Technical Terms and Characteristics
... The relationship between switching time and collector current is shown in Fig.2-6 (Tj = 125°C) and Fig. 2-7 (Tj =150°C). At greater collector currents or higher Tj, the switching time increases causing higher losses. The effect of gate resistance (Rg) vs. switching time can be seen in Fig.2-8. When ...
... The relationship between switching time and collector current is shown in Fig.2-6 (Tj = 125°C) and Fig. 2-7 (Tj =150°C). At greater collector currents or higher Tj, the switching time increases causing higher losses. The effect of gate resistance (Rg) vs. switching time can be seen in Fig.2-8. When ...
TL circuits with half- and quarter
... • Last lecture we established that phasor solutions of telegrapher’s equations for TL’s in sinusoidal steady-state can be expressed as V +ejβd − V −e−jβd V (d) = V e + V e and I(d) = Zo in a new coordinate system shown in the margin. + jβd ...
... • Last lecture we established that phasor solutions of telegrapher’s equations for TL’s in sinusoidal steady-state can be expressed as V +ejβd − V −e−jβd V (d) = V e + V e and I(d) = Zo in a new coordinate system shown in the margin. + jβd ...
PSpice with Cadence
... The phase isn’t displayed on the schematic for the VSIN source, but it can be added. Double-click on it to bring up the property editor. Find the ‘PHASE’ field and select it, then click the ‘Display…’ button. Select Name and Value from the Display Format list, then click Ok. The ‘PHASE’ property is ...
... The phase isn’t displayed on the schematic for the VSIN source, but it can be added. Double-click on it to bring up the property editor. Find the ‘PHASE’ field and select it, then click the ‘Display…’ button. Select Name and Value from the Display Format list, then click Ok. The ‘PHASE’ property is ...
Keysight U1450A/U1460A Series Insulation Resistance Testers
... Keysight's new insulation resistance tester family ...
... Keysight's new insulation resistance tester family ...
FAN7554 Versatile PWM Controller Features Description
... fixed time constant because of this component. If the feedback loop, which controls the output voltage, was to start without the soft start circuit, the feedback loop would appear to be open during initial start-up , so, at start-up, the feedback voltage applied to the PWM comparator’s inverting inp ...
... fixed time constant because of this component. If the feedback loop, which controls the output voltage, was to start without the soft start circuit, the feedback loop would appear to be open during initial start-up , so, at start-up, the feedback voltage applied to the PWM comparator’s inverting inp ...
Transistors - University of Toronto Physics
... The following diagram shows the circuit used in the example of finding the operating region of the transistor using several voltage measurements. RC 1k ...
... The following diagram shows the circuit used in the example of finding the operating region of the transistor using several voltage measurements. RC 1k ...
all other uses, in any ... © 2013 IEEE
... the development of multilevel topologies to achieve not only more voltage levels but also more cost-effective topologies [1]. As wind turbines are now entering multi-MW power range, the multilevel converters with high cost-effective performance are becoming preferred [2]. In the last few decades, th ...
... the development of multilevel topologies to achieve not only more voltage levels but also more cost-effective topologies [1]. As wind turbines are now entering multi-MW power range, the multilevel converters with high cost-effective performance are becoming preferred [2]. In the last few decades, th ...
System recovery made faster through advanced event monitoring
... • Powerlogic® System Manager™ Software integration, paging, or custom advanced reports ...
... • Powerlogic® System Manager™ Software integration, paging, or custom advanced reports ...
Important Principle:
... • BALUNS can also change impedance levels. For example, 4:1, or 200W to 50W or 300W to 75W. • UNUN means “Unbalanced to Unbalanced” This is a device inserted into a coaxial transmission line usually to reduce “common mode” currents more on that later. ...
... • BALUNS can also change impedance levels. For example, 4:1, or 200W to 50W or 300W to 75W. • UNUN means “Unbalanced to Unbalanced” This is a device inserted into a coaxial transmission line usually to reduce “common mode” currents more on that later. ...
BSPS2255TN(R) / BSPS2255TT(R)
... * N-PE Surge arrester for location between neutral conductor and protective conductor in TT systems. ** See Cooper Bussmann SPD Limited Warranty Statement (3A1502) for details at www.cooperbussmann.com/surge. ...
... * N-PE Surge arrester for location between neutral conductor and protective conductor in TT systems. ** See Cooper Bussmann SPD Limited Warranty Statement (3A1502) for details at www.cooperbussmann.com/surge. ...
A test of the linearity of a photomultiplier used for reflectivity
... directions, and allowing for a phase difference between the components caused by the bircfringence of the filter. Because of the large difference in the amplitudes of the two components, the resulting ellipticity will be small. In addition to sin20, the expression contains a term in sin 20 and a con ...
... directions, and allowing for a phase difference between the components caused by the bircfringence of the filter. Because of the large difference in the amplitudes of the two components, the resulting ellipticity will be small. In addition to sin20, the expression contains a term in sin 20 and a con ...
Review
... Idealized switch symbol When on, current can flow only in the direction of the arrow Instantaneous switching from one state to the other Conduct large current with zero voltage drop in on-state Block large forward and reverse voltages with zero current flow when off • Infinite voltage and current ha ...
... Idealized switch symbol When on, current can flow only in the direction of the arrow Instantaneous switching from one state to the other Conduct large current with zero voltage drop in on-state Block large forward and reverse voltages with zero current flow when off • Infinite voltage and current ha ...
Understanding Steering Diode Arrays
... On the IC side of the transformer, a rail-to-rail device is used to prevent CMOS latch-up by clamping the line voltage to the level of the supply rail. The integrated TVS/Steering Diode array keeps the potential between the supply voltage and the ground to within the breakdown voltage of the device ...
... On the IC side of the transformer, a rail-to-rail device is used to prevent CMOS latch-up by clamping the line voltage to the level of the supply rail. The integrated TVS/Steering Diode array keeps the potential between the supply voltage and the ground to within the breakdown voltage of the device ...
unit08 - electromaths
... In an electrical company there are 30 employees. 20 are male and 10 are female. Form a ratio of male to female staff by completing this ratio. ...
... In an electrical company there are 30 employees. 20 are male and 10 are female. Form a ratio of male to female staff by completing this ratio. ...
Electrical substation
A substation is a part of an electrical generation, transmission, and distribution system. Substations transform voltage from high to low, or the reverse, or perform any of several other important functions. Between the generating station and consumer, electric power may flow through several substations at different voltage levels.Substations may be owned and operated by an electrical utility, or may be owned by a large industrial or commercial customer. Generally substations are unattended, relying on SCADA for remote supervision and control.A substation may include transformers to change voltage levels between high transmission voltages and lower distribution voltages, or at the interconnection of two different transmission voltages. The word substation comes from the days before the distribution system became a grid. As central generation stations became larger, smaller generating plants were converted to distribution stations, receiving their energy supply from a larger plant instead of using their own generators. The first substations were connected to only one power station, where the generators were housed, and were subsidiaries of that power station.