(C2) ;Elektrisches Energie穟bertragungssystem f穟r die eigensichere Energie穟bertragung

摘要

An intrinsically safe electric energy transmission system, especially for face support controls in mining, comprises an intrinsically safe power supply 1 connected by an energy transmission line 2 to at least one load 8, the line 2 having at least one intrinsically safe line portion terminated by a Zener diode 6 which has a Zener voltage equal to the maximum transmission voltage and is connected in parallel with a fast-acting diode 7 for neutralising inverse voltages, and the length L of the line portion 2 being less than or equal to the maximum permissible length, as dependent on the line characteristics and intrinsic safety values of the current and voltage of supply 1, determined to be safe without such termination. Individual line portions 2 each terminated by diodes 6, 7, may be connected in series, with a respective load 8 being connected to the terminated end of each line portion. <IMAGE>