Electricity: electrical systems and devices – Safety and protection of systems and devices – High voltage dissipation
Patent
1995-06-07
1998-02-24
Fleming, Fritz
Electricity: electrical systems and devices
Safety and protection of systems and devices
High voltage dissipation
361111, 324512, H01C 712
Patent
active
057216622
ABSTRACT:
A floating ground isolator for shunting only selected damaging and/or annoying induced energy from a communications cable sheath to ground, thereby facilitating long range cable location using conventional signal radiation techniques. The floating ground isolator provides a surge suppression circuit to effectively suppress dangerous transient surges present on the cable sheath and a filtering circuit to pass annoying periodic signals within a preselected frequency range from the cable sheath to ground. A selectively connected terminating resistance is also provided between the cable sheath and ground to form a side leg termination useful in facilitating long range cable location on spurs emanating from a main cable line. Furthermore, a relay controlled floating ground circuit is disclosed having a normal position shunting the cable sheath to ground and an actuated position lifting the ground connection.
REFERENCES:
patent: 3668640 (1972-06-01), Driscoll
patent: 4262317 (1981-04-01), Baumbach
patent: 5224878 (1993-07-01), Lurie et al.
ACT Communications, Inc. Schematic 44 x Jun., 1992.
Glaser James A.
Glaser Ronald W.
ACT Communications, Inc.
Fleming Fritz
Medley Sally C.
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