Overhead Conductor Installation Guide Recommended Practices First Edition 1 INTRODUCTION This guide provides suggestions for various methods, equipment and tools that have been found practical based on field experience during the installation of General Cable’s TransPowr® bare overhead conductors on transmission lines. It is also applicable to many aspects of distribution line installations. The intent of this guide, along with IEEE Standard 524, Guide to the Installation of Overhead Transmission Line Conductors, is to provide guidance for an optimized installation of overhead conductors. The recommended dimensions for the stringing sheaves and bullwheel tensioner have been adapted from the IEEE publication. It is recognized that each and every installation set-up is different and there will be situations where customized techniques will be required that may be different from those found within this document. This installation guide applies to the following conductor constructions: TransPowr® AAC, AAC/T-2® ACSR, ACSR/TW, ACSR/T-2®, ACSS, ACSS/TW, Covered Line Wire and Tree Wire. ACSS, ACSS/TW and T-2® Installation Guide. TransPowr® , AAAC, AACSR, ACAR, As recommended by IEEE Standard 524, the conductor used in a given pull or sagging section shall be from a single manufacturer. Special procedures for TransPowr® are provided in the tabbed sections throughout the ACSS and ACSS/TW products are high temperature bare overhead conductors manufactured with fully annealed 1350-O aluminum wires. The annealed aluminum wires are softer and much more ductile than the hard drawn wires in ACSR and ACSR/TW conductors. While these conductor types may be installed using techniques and equipment similar to that used to install conventional ACSR and ACSR/TW conductors, there are some special procedures that are recommended. TransPowr® AAC/T-2® and ACSR/T-2® products are bare overhead conductors manufactured with two tension-balanced conventional component conductors twisted around each other. While this conductor type may be installed using techniques and equipment similar to that used to install standard round overhead conductors, there are some special procedures that are recommended. Also discussed in this guide are problems that can be encountered during installation and suggested trouble- shooting steps that may be of further assistance during the installation of TransPowr® T-2® 2 OVERHEAD CONDUCTOR HANDLING The emphasis in any bare conductor installation should be placed on avoiding damage to the conductor surface. The conductor should not be dragged across the bare ground, over rocks, fences or guard structures. Overhead conductor should never be rewound from the original shipping reel to another reel in the field. Reels should be stored with the flanges upright on paved or compacted surfaces. For long-term storage, the flanges of the reel should be supported using wood or similar cribbing to keep the reel flange off of the ground. Never lay or transport a reel on its side. 3 OVERHEAD CONDUCTOR STRINGING METHODS Most methods of installation have been used satisfactorily to install overhead conductors. These conductor stringing methods include Tension, Semi-Tension, Layout and Slack. All of these methods are adequate for distribution line erection. General Cable and IEEE Standard 524 only recommend the tension method (Section 3.1) for the installation of ACSS and ACSS/TW as well as for any other multilayer transmission conductor construction, defined as having more than one layer of aluminum over the core or central wire. The following is a brief description of each of these methods. 3.1 Tension Method The tension method means that the conductor is pulled into position under tension. A puller (winch) is set up at one end of the line section, and a bullwheel tensioner at the other end. The reel of conductor is staged behind the bullwheel tensioner. A steel cable or synthetic rope, called a pulling line, is strung from the puller through each stringing block between the puller and bullwheel tensioner. The end of the pulling line is then attached to the conductor end after it has been threaded through the bullwheel tensioner. During the stringing process, the conductor is pulled through the stringing sheaves until the end reaches the puller. The tension maintained between the bullwheel tensioner and the puller keeps the conductor clear of the ground and other obstructions that could cause damage. It is important to note that the back-tension is created and controlled by the bullwheel tensioner and not the pay-off reel.
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Overhead Conductor Installation Guide
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