OPGW cable power a boat factory outlets

OPGW cable power Published: 2014-02-17 09:43:13 Source: one hundred Hang Zhou Edit: edit OPGW cable, Optical Fiber Composite Overhead Ground Wire (OPGW also known). The fiber is placed in the ground in high voltage overhead transmission lines, transmission lines for constituting fiber-optic network, which forms the structure of both the ground and the dual function of communication, commonly referred to as OPGW cable. Since the optical fiber with anti-electromagnetic interference, light weight and other characteristics, it can be installed on top of the transmission line towers without having to consider the best frame hanging position and electromagnetic corrosion problems. Thus, OPGW with high reliability, superior mechanical properties, lower cost and other notable features. This technique when newly installed or replaced existing ground particularly suitable and economical. Fiber is the use of the core and cladding refractive index difference between the size of the two materials to make light in optical fiber transmission, which became a major revolution in communications history. Fiber optic cable light weight, small size, the power system has been adopted, the transfer between the substation and dispatch telephone center scheduling, remote signal, relay, television images and other information. In order to improve the stability and reliability of fiber optic cable, fiber optic cable and foreign development phase conductor transmission lines, power cables and composite overhead ground as one of the structures. OPGW cable due to the metal wire wrapped, so that the cable is more reliable, stable, strong, due to the composite overhead ground wire and cable as a whole, compared with other forms of fiber optic cable, both to shorten the construction period and save construction costs. In addition, if the aluminum-clad steel wire or aluminum wire stranding of OPGW, equivalent to erect a good conductor of the overhead ground wire, you can receive reducing power lines arc current, lower power frequency overvoltage, improve power line communication lines multiple benefits of interference and dangerous impact. OPGW installation design, to consider the tie with wire stress, sag and insulation gaps, as well as its load should not exceed the current basis with a tower and permitted range. Therefore should be calculated according to the selected OPGW main technical parameters of its characteristics, combined with practical engineering design junction box, all kinds of fittings and accessories layout, outline drawings and installation diagram. 1. Early treatment for OPGW early elongation elongation process, can be used to cool method, that review OPGW steel than aluminum, similar cooling reference value or ground wire handle its initial elongation. 2. The anti-vibration design fittings measures supporting the use of OPGW, Clamp for wire-cutter style, drape clips with pre-twisted wire, rubber gaskets, which already has two gold with anti-vibration capability. In order to further strengthen anti-vibration capability, consider installing anti-vibration hammer, generally based on the span calculation: downshift from ≤300M, install a damper; time span> 300M, install two damper. 3. OPGW construction Erection Problems Erection OPGW different from ordinary steel cable, pay attention to prevent permanent damage to avoid future affect the performance of the fiber, and should consider: reverse OPGW, and slightly bent, clip outside partial radial stress and pollution of the fiber. Therefore, during the construction phase to take effective measures to solve the following: (1) prevent OPGW reversed in running board and tighten the clamp installation counterweight, anti-twist device; using a special dual-slot pulley; dual winch tension defense machine; (2) to prevent and reduce the stress of OPGW slightly curved and not allowed to have an acute angle occurs (the minimum bend radius control 500mm); OPGW cable disc diameter shall be not less than 1500mm; pulley diameter should be more than 25 times the diameter of OPGW, generally not less than 500mm; medial pulleys have nylon or rubber pads to prevent scratches the surface of OPGW; proper traction lines and actinomycetes fittings; specifies the maximum disk OPGW length 6000M, in order to prevent excessive number of pulleys; continuous line angle limit of actinomycetes ≤30 °, in a section of a strain of actinomycetes, OPGW towards the corner post should show "C" shape; control (3) off tension: the use of hydraulic tension belt tension release mechanism put-ray machine and tractor; actinomycetes speed limit ≤0.5 m / s; (4) to prevent fiber contamination in Erection of OPGW should pay attention to the package to end; in addition, OPGW arrived to the scene, before the erection, erection is carried out after the end of the optical fiber splicing and line construction After the scene in a timely manner should OPGW fiber attenuation acceptance testing. OPGW cable mainly in the 500KV, 220KV, 110KV voltage line use, the impact of power lines, security and other factors, multi-application on the new line. OPGW applicable characteristics are: (1) high pressure over 110kv line, span large (generally in more than 250M); (2) easy to maintain, easy to solve the problem for a line across its line of mechanical properties can meet big leap; ( 3) OPGW outer layer of metal armor, no effect on the high-voltage erosion and degradation; (4) OPGW in the construction must be power outages, large power loss, so the new 110kv high voltage line above should be used in OPGW; (5) OPGW performance index, the short-circuit current, the more need to use a good conductor do armored, correspondingly reducing the tensile strength, the tensile strength and in certain cases, to improve the short-circuit current capacity, and only increases the metal cross-sectional area resulting cable diameter and cable weight increased, so the strength of the line tower raised security issues.