Replacement of the H Arm of Transmission Line Structure
© 2007 Dr. Ray Franco, PhD., PE r.a.franco@ieee.org
Entergy of Mississippi is changing the wood arms and insulators on the 115 KV transmission line between Bovina and Yahoo City, MS. The top cross member of the structure, which is supporting the shield wires (ground), was already a metal arm. On 26 March 2007, I photographed the Pike Electric crew performing this work.
For Maximum Resolution, Click on the Body of the Picture.
The Wood Arm and Insulators will be replaced on the Depicted HXX Transmission Line Structure.
The Pike Electric Crew: Cecil Jackson, Ray Morrow, Brent Smith, Nicholas Fernandez, Shannon Pippen , Randy Parks.
Some Assembly Work of the Metal Replacement Arm is done on the Ground.
The Crew Chief, Ray Marron, was fixing to Load One of the New Polymer Insulators into the Bucket when I stopped him.
Safety First - The Far Insulator will be the First one replaced. The Wood Pole is grounded to the Phase Line to Form an Equal-Potential Zone.
Holes are being drilled into the Pole for Bolts,
Which will support the New Metal Arm.
Linemen Climb the Structure, and the First Section of the Metal Arm is delivered to them via the Bucket Truck.
The First Section of Metal Arm is secured.
The Second and Last Section of the Metal Arm is delievered to the Linemen.
Both Lineman and the man in Bucket are securing the Metal Arm.
The Polymer Insulator is attached to the Metal Arm by the Lineman.
The Winch on Bucket is used to Hole the Line,
while the New Insulator is being attached to the Line.
The Old Insulator is lowered to the Ground via a Pulley.
The End of Old Wood Arm is removed with a Chain Saw.
The Second Polymer Insulator is attached to the Metal Arm.
Before Any Work on the Second Pole began,
the Second Wood Pole was grounded to its Phase Line.
Again, the Winch on the Bucket is used to relieve the Mechanical Load (Strain) so the Center Insulator can be removed.
The Center Polymer Insulator is connected to its Phase Line.
The First Part of the Old Wood Arm is removed.
The Second and Last Part of the Old Wood Arm is Removed, and the Metal Arm connected to the Shield Wires. The Final Product.
