Title: Transmission line-communications equipment coupling unit having short-circuit and overvoltage protection

Abstract: A transmission line carries power cables and twin wire communication lines. The coupling unit consists of an elongated, oil filled insulating body having metal caps closing off its opposite ends. The twin wires are brought to the low impedance terminals of an autotransformer which also has a pair of high impedance terminals and a center tap. Each of the high impedance terminals is coupled through a coupling capacitor to the high impedance terminals of a second autotransformer mounted within the second metal cap. The second autotransformer also has a center tap and also has a pair of low impedance terminals for connection to the communications equipment. The center tap of the first autotransformer is connected through a capacitor or a cathode drop arrester to the first metal cap. Overvoltage arresters are connected from the center tap to the low impedance and to the high impedance terminals of both autotransformers.

Do you think this is a good invention? Vote now:

Votes so far: For:(0) Against:(0)
Other info:

Inventors: Dornseifer, Karl Friedrich (Cologne, DT)
Kirch, Hans-Joachim (Cologne, DT)
Levacher, Friedrich (Brauweiler, DT)
Nolting, Karl Heinz (Cologne, DT)

Application Number: 431561
Filing Date: 1974-01-07
Publication_date: 1976-04-13
Assignee: Felten & Guilleaume Carlswerk Aktiengesellschaft (Cologne, DT)
Primary Class(es): 361/40 333/24C, 361/65
Other Classes:
US Patent Ref:

2066935	Jan, 1937	Hodnette	317/14.
2172640	Sep, 1939	Nelson	317/14.
2703852	Mar, 1955	Meador	336/70.
3644787	Feb, 1972	Hamilton	317/31.
3771069	Nov, 1973	Levacher et al.	333/24.

Other Refs:
Primary Examiner: Miller, J. D.
Assistant Examiner: Salce, Patrick R.
Attorney: Striker; Michael J.