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EK33821826
EK33821826

... to 10ms and 5ms to 7.5ms respectively [11]. This gives the analysis of waveform of capacitor voltage, line current, thyristor current and capacitor current of TCSC as shown in fig.. It has been concluded that at if alpha=117o for positive waveform then there should be a difference or phase delay of ...
Power supply CP-D 12/2.1
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...  Do not modify the installation (primary and secondary side)! High current! Risk of electric arcs and electric shock (danger to life)!  Risk of burns: Depending on the operation conditions the enclosure can become very hot.  If the internal fuse blows, most probably the device is defect. In th ...
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universal power cells
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... Note that inside the HV Power Supply these three grounds connect at a single node denoted by ‘Star Connection” in the figure. When the HV Power Supply is connected to the load, each of the three grounds must connect separately to three corresponding terminals at the load. The grounds must connect se ...
Detecting, Identifying, and Correcting Power Quality Problems
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... often the electric power quality is suspected. It is a convenient culprit, as it is invisible and not easy to defend. Power quality problems may be very difficult to troubleshoot, and often the electric power may not have any relation to the actual problem. For example, in an industrial plant the fa ...
International Electrical Engineering Journal (IEEJ) Vol. 6 (2015) No.6, pp. 1925-1930
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... The proposed system is modeled using Matlab/Simulink and simulation results are presented. The results revealed the fast recovery of stator, rotor, and dc link currents to their steady state values after fault removal. The electric torque, the active and reactive stator power, and the active and rea ...
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... equipment. These LEDs are designed for continuous, ongoing use. They consume little power, just a few cents worth a month, like a clock. UNSWITCHED OUTLET: This outlet provides conditioned power at all times when the PL-PRO is plugged in and operating under normal conditions. CIRCUIT BREAKER/ON-OFF ...
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A New Figure of Merit and General Properties of Wireless
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... by the opmtimum load reactacne Xr,η . Fig. 4 shows two efficiency curves for two different values of Qk together with the corresponding values of α and β normalized to the optimum load resistance Rr,η on a semi-log scale. The curves are symmetrical and the efficiency at α/Rr,η equals the efficency a ...
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... source and drives a constant-voltage load,1 as illustrated in Fig. 1. For example, this often occurs in battery-charger/power-supply systems, such as employed in automotive and aerospace applications. The three-phase source with series inductance represents the alternator back emf and synchronous in ...
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Power factor



In electrical engineering, the power factor of an AC electrical power system is defined as the ratio of the real power flowing to the load to the apparent power in the circuit, and is a dimensionless number in the closed interval of -1 to 1. A power factor of less than one means that the voltage and current waveforms are not in phase, reducing the instantaneous product of the two waveforms (V x I). Real power is the capacity of the circuit for performing work in a particular time. Apparent power is the product of the current and voltage of the circuit. Due to energy stored in the load and returned to the source, or due to a non-linear load that distorts the wave shape of the current drawn from the source, the apparent power will be greater than the real power. A negative power factor occurs when the device (which is normally the load) generates power, which then flows back towards the source, which is normally considered the generator.In an electric power system, a load with a low power factor draws more current than a load with a high power factor for the same amount of useful power transferred. The higher currents increase the energy lost in the distribution system, and require larger wires and other equipment. Because of the costs of larger equipment and wasted energy, electrical utilities will usually charge a higher cost to industrial or commercial customers where there is a low power factor.Linear loads with low power factor (such as induction motors) can be corrected with a passive network of capacitors or inductors. Non-linear loads, such as rectifiers, distort the current drawn from the system. In such cases, active or passive power factor correction may be used to counteract the distortion and raise the power factor. The devices for correction of the power factor may be at a central substation, spread out over a distribution system, or built into power-consuming equipment.
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