首页>
外国专利>
Method for remotely controlling the switching-on and -off of load objects in a power system by means of remote control signals radiated at radio frequency, and device for carrying out the method
Method for remotely controlling the switching-on and -off of load objects in a power system by means of remote control signals radiated at radio frequency, and device for carrying out the method
展开▼
机译:通过射频辐射的遥控信号远程控制电力系统中负载对象的接通和断开的方法以及执行该方法的装置
展开▼
页面导航
摘要
著录项
相似文献
摘要
Remote control signals which are transmitted non-line-conducted by means of radio-frequency waves are used for switching load objects on and off in a power system. For this purpose, radio waves of existing transmitters, for example broadcast transmitters operating in the medium-wave band (520-1560 kHz) can be used. The transmitter operating in amplitude modulation is modulated, also in amplitude modulation, with the remote control commands in a frequency range which is below the ordinary modulation band (10 to 30 Hz with an audio-frequency range from 50 to 10,000 Hz). For this extraordinary modulation, a reduced modulation percentage of 5% is provided so that no special measures need to be provided at the transmitter end. The receiver (1) for these remote control commands is designed in such a manner that it is capable of separating the weakly modulated pulses from the ordinary modulation so that the latter cannot trigger any faulty switching. For this reason, a low-frequency filter (12) is provided as essential component of the receiver in order to recover the coded remote control commands. The output of the filter (12) is conducted via a rectifier (15) to a level comparator (18) which only passes pulse sequences which reach a modulation percentage of approximately 5%. The switching member (2) for switching a load object (3) on or off is controlled via a following decoder (21). IMAGE
展开▼