-In this paper, we proposed a system and a scenario to raise efficiency of gas safety management by developing wireless ZigBee communication modules, smart-home gas safety appliances and the system suitable for gas safety. Our designed system consists of a micom gas meter, an automatic extinguisher, sensors, and a wall-pad. A micom-gas-meter monitors gas flow, gas pressure, and earthquake. An automatic fire extinguisher checks combustible gas leaks and temperature of 100โ(cut off) and 130โ(fire). Sensors measure smoke and CO gas. In our novel system, a micom-gas meter cut off inner valve with warnings, an automatic fire extinguisher cut off middle valve and spray extinguishing materials, and sensors generate signals when detecting smoke and CO and then take a next action. Gas safety appliances and sensors automatically takes measures, and transmit those information to a wall-pad. The wall-pad again transmits real time information to server. Users can check and manage gas safety situations by connecting BcN server through web or mobile application. We hereby devised scenarios for gas safety and risk management based on the smart, and demonstrated their efficiency through test applied to filed.
In this paper an excitation system which is effective for improving the start-up characteristic of synchronous motors has been discussed in this study. Excitation system is a system that maintains/controls the voltage of an output terminal(s) by supplying direct current to a field coil. The excitation control system of synchronous motor should be able to achieve stabilization (i.e., power factor 1) as rapidly possible by controlling excitation current in accordance with the control mode applied. When a direct current is passed through the field winding of the rotor, the rotation is restrained in the rotor. When the
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