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The compensation system introducing Δ-connected and Y-connected compensation networks can be used to eliminate negative sequence components and zero sequence components of unbalanced load currents and improve power factor to unity. To summarize the existing achievements, this paper applied instantaneous reactive power theory to the control strategies in compensation networks to improve power factor...
Frequency signal is gotten from voltage signal by external V/F converter, and then is sent to high-speed counter of PLC. As a host, CPU222 of Siemens S7-200 series PLC is used. Through programming PLC, input voltage is measured by high-speed I/O channels. High-speed digital pulse of variable duty cycle produced by PLCpsilas PWM pulse generator is turned into voltage signal of amplitude-adjustable...
We demonstrate a quantum cascade laser featuring a low-voltage-defect short injector. Devices showing a voltage-defect as low as 20 meV and voltage efficiency of 88% at 80 K are reported, with > 80% voltage efficiency at room temperature.
It is important to comprehend the interruption phenomenon of contact materials for aiming at adaptation to high voltage of vacuum circuit breakers. Then, we carried out measurement of arc energy and anode surface temperature and observation of vacuum arc by using the vacuum chamber. Moreover, we made prototype of new contact materials that was based on these tests result. And these contact materials...
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