37 2. SPECIFICATIONS This line specification shall take precedence if there is any conflict between it and the following specifications: PHASE CONDUCTOR AND GROUNDWIRE IEC TST Zinc-coated steel wires for stranded conductors. Quality requirements for the procurement of quality related assets, goods and services. HARDWARE SANS NWS 1019 Rev 1 TSP Code of practice for overhead power lines for conditions prevailing in South Africa. Compression accessories for phase and earth conductors for transmission lines. Design, manufacture and installation specification for transmission line labels EARTHING REQUIREMENTS TST Earthing of transmission line towers TOWERS TRMSCAAC1 TI TRMSCAAH2 Rev 5: Transmission line towers and line construction. Specification for suspension and strain assemblies and for hardware for transmission lines. NOTE: Wherever reference is made to supplier(s), vendor(s), etc, it shall mean the Contractor. TX Revision 0 December 2013 Page 37
Iec 60826 Design Criteria Of Overhead Transmission Lines Pdf Download dressiss
40 APPENDIX C: HARDWARE ASSEMBLY DRAWINGS AND INFORMATION 1. HARDWARE ADDITIONAL INFORMATION 1.1. Hardware Standards The standards within this section provide for the design and technical requirements of the line: IEC 60120: IEC 61089: IEC 61284: IEC 60372: Dimensions of ball and socket couplings of string insulator units. Round wire concentric lay overhead electrical stranded conductors. Overhead lines Requirements and tests for fittings. Locking devices for ball and socket couplings of string insulator units. IEC 60383: Insulators for overhead lines with nominal voltage above 1000V. IEC 60471: IEC 60826: BS 2874: ISO 14399: BS 4190: BS 7668: BS EN 10137: BS EN 10029: ISO 1461: BS 970: BS EN ISO 9001: 9002 Dimensions of clevis and tongue couplings of string insulator units. Loading and strength of overhead transmission lines. Specification for wrought steel for mechanical and applied engineering purposes. ISO Metric screw threads. Specification for ISO metric black hexagon bolts, screws and nuts. Specification for weld able structural steels. Hot finished structural hollow sections in weather resistant steels. Plates and wide flats made of high yield structural steels in quenched and tempered or precipitation hardened conditions. Specification for tolerances on dimensions, shape and mass for hot rolled steel plates 3mm thick or above. Specification for hot dip galvanized coatings on iron and steel articles. Specification for wrought steel for mechanical and applied engineering purposes. Quality systems model of quality assurance in design, development, production, installation and servicing. TX Revision 0 December 2013 Page 40
41 BS EN 10025: BS EN 10163: BS EN 10210: Hot rolled products of non-alloy structural steels. Technical delivery conditions. Specification for delivery requirements for surface conditions of hot rolled steel plates, wide flats and sections. Hot finished structural hollow sections of non-alloy and fine grain structural steels. BS EN 287-1:1992: Approval testing of welders for fusion welding. Part 1: Essential variables, range of approval examination and testing, acceptance requirements, re-tests, period of validity. Annexes on steel groups, welders test certificates, procedure specification and job knowledge. BS EN 288-3:1992 Specification and approval of welding procedures for metallic materials Part 3: Welding procedure tests for the arc welding of steels HARDWARE SPECIFICATIONS This line specification shall take precedence if there is any conflict between it and the following specifications: TST SANS : 2013 TSP TSP (TRMSCABS9 Rev1) TRMSCAAI3: TRMSCAAC1 TI TSP Quality requirements for the procurement of quality related assets, goods and services. Code of practice for overhead power lines for conditions prevailing in South Africa. Ceramic and Glass Cap and Pin Insulators Specification for polymeric long rod insulators for Transmission voltages of 220kV and above Spacer or spacer damper assemblies for conductor bundles for transmission lines. Transmission line towers and line construction. Phase conductor for transmission lines. TX Revision 0 December 2013 Page 41
67 1.1 INTRODUCTION The method statements provided below are to be used for the construction of transmission lines, as it is the responsibility of the designer, as set out in the construction regulations. It is however still the responsibility of the contractor to provide and demonstrate to the client a suitable and sufficiently documented health and safety plan which includes safe work procedures/method statements to mitigate, reduce or control the hazards identified. 1.2 PURPOSE The procedure contained below is to be used as an informative reference for the contractors; it will provide a starting place for the contractors to compile their own safe work procedures. The safe work procedure will conform to the legislation and specifically the Construction Regulations as part of a Health and Safety Plan. 1.3 GENERAL CONSTRUCTION REGULATIONS ROLES AND RESPONSIBILITIES Responsibility of the contractor: According to the construction regulations 9. Structures (1) a contractor shall ensure that (a) all reasonably practicable steps are taken to prevent the uncontrolled collapse of any new or existing structure or any part thereof, which may become unstable or is in a temporary state of weakness or instability due to the carrying out of construction work; and (b) no structure or part of a structure is loaded in a manner which would render it unsafe Responsibility of the designer: (2) The designer of a structure shall (a) before the contract is put out to tender, make available to the client all relevant information about the design of the relevant structure that may affect the pricing of the construction work; TX Revision 0 December 2013 Page 67
98 Once this first off inspection is carried out by the designer the construction can continue. 5.2 GENERAL When stringing and regulating conductors close to a parallel energized line(s), and when transferring conductor onto suspension and strain hardware and when fitting jumpers at strain towers, there is a real risk for workers to get injured or killed as a result of induced voltage and current. This risk can be avoided by applying safety earthing in two levels, namely 1 set of working earths on either side of the work sites, and a fall-back set of earths further away (master earth) that can act as a backup should anything go wrong with the earths closer to the worksite. It is also assumed that proper earthing tools are used, and that earthing will always be applied and be removed using an insulated earth stick. The main aim of the earthing described above is to create a preferred path for induced energy (described in engineering terms as electrostatic and electromagnetic induction which leads to measurable voltage and current levels). It is further implied that the worker should never become part of the electrical circuit through the rigorous application of the working earths. Note that the earthing system that is designed and intended to be part of the operation of the line during its lifecycle is to be seen as a separate earthing system. Internationally, line construction contractors are required to apply the safety earthing principles as laid down in in the following standards, including the adherence to earthing equipment specifications: IEC IEC ITEE Std IEEE Std 524a Live working Guidelines for the installation of transmission line conductors and earthwires stringing equipment and accessory items. Live working Portable equipment for earthing or earthing and shortcircuiting Guide to the installation of overhead transmission line conductors Guide to grounding during the installation of overhead transmission line conductors. TX Revision 0 December 2013 Page 98
V.A PJM Design and Application of Overhead Transmission Lines 69kV and Above These design criteria have been established to assure acceptable reliability of the bulk transmission system facilities. These
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