Metal working – Means to assemble or disassemble – Means to assemble electrical device
Reexamination Certificate
2007-01-09
2009-06-16
Arbes, C. J (Department: 3729)
Metal working
Means to assemble or disassemble
Means to assemble electrical device
C029S755000, C029S868000, C029S869000
Reexamination Certificate
active
07546680
ABSTRACT:
A method and associated equipment for replacing existing overhead transmission line conductors with new ones while the transmission line remains in service and carrying power. The invention uses the old conductor to pull the new conductor through a series of sheaves installed at the bottom of each tower insulator. Conventional tension-stringing principles are used to assure that both the old and new conductors maintain a safe distance from ground. To achieve this, both the pulling and tensioning (braking) equipment, as well as supply and take-up reels or drums may be elevated to power line voltage and the current is transferred between new conductor and old, while in transit to the line, by means of a brush system and a conducting wheel which may or may not be integral with pulling and tensioning equipment.
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Black, R.C., et al., A Live Line Method for Retensioning Transmission Line Conductors, CIGRE, Int'l Conference, 1970 Session, Aug. 24-Sep. 2.
IEEE Guide to the Installation of Overhead Transmission Line Conductors, IEEE Std. 524-2003, Published Mar. 12, 2004.
Arbes C. J
Dingman Brian M.
Mirick O'Connell DeMallie & Lougee LLP
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