2016 China International Conference on Electricity Distribution
... (SVG), etc, are wildly used in the power grid [1]. It is required that these GC-VSCs should inject high quality ac current into the grid. However, the GC-VSC usually exhibits low harmonic impedance presented to the grid, which means the injected grid current from the GC-VSC is more sensitive to the ...
... (SVG), etc, are wildly used in the power grid [1]. It is required that these GC-VSCs should inject high quality ac current into the grid. However, the GC-VSC usually exhibits low harmonic impedance presented to the grid, which means the injected grid current from the GC-VSC is more sensitive to the ...
... One of the wires is used to carry signals to the receiver, and the other is used only as a ground reference. The receiver uses the difference between the two. In addition to the signal sent by the sender on one of the wires, interference (noise) and crosstalk may affect both wires and create unwante ...
Filters and Impedance Matching
... A. A high-gain, direct-coupled differential amplifier with very high input impedance and very low output impedance B. A digital audio amplifier whose characteristics are determined by components external to the amplifier C. An amplifier used to increase the average output of frequency modulated amat ...
... A. A high-gain, direct-coupled differential amplifier with very high input impedance and very low output impedance B. A digital audio amplifier whose characteristics are determined by components external to the amplifier C. An amplifier used to increase the average output of frequency modulated amat ...
15 Single-phase series ac circuits
... 40 D 8 V The phasor diagram is shown in Figure 15.7(b). (Note that in a.c. circuits, the supply voltage is not the arithmetic sum of the p.d.’s across components but the phasor sum) Problem 12. A coil of inductance 159.2 mH and resistance 20 is connected in series with a 60 resistor to a 240 V, ...
... 40 D 8 V The phasor diagram is shown in Figure 15.7(b). (Note that in a.c. circuits, the supply voltage is not the arithmetic sum of the p.d.’s across components but the phasor sum) Problem 12. A coil of inductance 159.2 mH and resistance 20 is connected in series with a 60 resistor to a 240 V, ...
Chapter 21: Resonance
... • Reactive powers dissipated by inductor and capacitor are I2X • Reactive powers are equal and opposite at resonance ...
... • Reactive powers dissipated by inductor and capacitor are I2X • Reactive powers are equal and opposite at resonance ...
Standing wave ratio
In radio engineering and telecommunications, standing wave ratio (SWR) is a measure of impedance matching of loads to the characteristic impedance of a transmission line or waveguide. Impedance mismatches result in standing waves along the transmission line, and SWR is defined as the ratio of the partial standing wave's amplitude at an antinode (maximum) to the amplitude at a node (minimum) along the line.The SWR is usually thought of in terms of the maximum and minimum AC voltages along the transmission line, thus called the voltage standing wave ratio or VSWR (sometimes pronounced ""viswar""). For example, the VSWR value 1.2:1 denotes an AC voltage due to standing waves along the transmission line reaching a peak value 1.2 times that of the minimum AC voltage along that line. The SWR can as well be defined as the ratio of the maximum amplitude to minimum amplitude of the transmission line's currents, electric field strength, or the magnetic field strength. Neglecting transmission line loss, these ratios are identical.The power standing wave ratio (PSWR) is defined as the square of the VSWR, however this terminology has no physical relation to actual powers involved in transmission.The SWR can be measured with an instrument called an SWR meter. Since SWR is defined relative to the transmission line's characteristic impedance, the SWR meter must be constructed for that impedance; in practice most transmission lines used in these applications are coaxial cables with an impedance of either 50 or 75 ohms. Checking the SWR is a standard procedure in a radio station, for instance, to verify impedance matching of the antenna to the transmission line (and transmitter). Unlike connecting an impedance analyzer (or ""impedance bridge"") directly to the antenna (or other load), the SWR does not measure the actual impedance of the load, but quantifies the magnitude of the impedance mismatch just performing a measurement on the transmitter side of the transmission line.