Known as the “Internet of Energy”, the smart grid is known for its strong, extensive interconnection, highly intelligent, open and interactive features. It is called the foundation platform for the third industrial revolution and has the overall effect on the Third Industrial Revolution Promote the role. Smart grid can not be separated from the robustness and optimization of power communication system, which is one of the prerequisites for realizing smart grid. In order to meet the special needs of power system communication, power special optic cable came into being.
Power special optical cable is through the power system, a unique line tower resources erection, attached to the power line and hung on the power tower optical composite optical cable, take full advantage of overhead power lines corridor. Special power cables take full advantage of the power system’s unique resources, and power grid structure closely integrated with the construction, with economic, reliable, fast and safe features. Power special optical fiber cable is less likely to be damaged by external forces and has high reliability. Although its own cost is relatively high, the construction cost is lower. Special power cables are installed on various power towers with different voltage levels. Compared with ordinary optical cables, they have special requirements on their electrical, mechanical and optical characteristics.
Special optical cables rely on the power system’s own line resources, avoiding conflicts and disputes with the outside world in terms of frequency resources, routing coordination, electromagnetic compatibility, etc., and have great initiative and flexibility.
Power special optical fiber cables are divided into optical fiber composite overhead ground wire OPGW, optical fiber composite overhead phase wire OPPC, all metal self-supporting optical fiber cable MASS, all-media self-supporting optical fiber cable ADSS, ground binding optical cable ADL and ground winding optical fiber cable GWWOP and so on。
OPGW optical cable is mainly used in 500kV, 220kV and 110kV voltage lines, and is affected by many factors such as line power failure and safety, and is mostly applied in new lines. Overhead ground line composite optical cable OPGW outstanding feature is the communication cables and overhead lines on the high-voltage transmission line into a whole, the optical cable technology and transmission line technology to become a multi-functional overhead ground, both lightning lines, and Is an overhead optical cable, at the same time, it is also a shielded cable. At the same time as the construction of high-voltage transmission lines, the construction of communication lines is also completed, which is very suitable for newly-built transmission lines. Common OPGW structure has three main categories, namely, aluminum tube type, aluminum frame type and (stainless) steel tube type.
The applicable features of OPGW are: (1) high voltage over 110kV lines, large span (usually above 250M); (2) easy to maintain, easy to solve for the problem of line crossing, its mechanical characteristics can meet the line span; 3) The outer layer of OPGW is metal armor, which has no effect on high-voltage electric erosion and degradation. (4) OPGW must be powered off during construction and has a large power loss. Therefore, OPGW should be used in the new high voltage lines above 110kV. OPGW performance indicators, the greater the short-circuit current, the more the need for a good conductor armored, the corresponding reduction in tensile strength, and in the case of a certain tensile strength, to increase the short-circuit current capacity, only increase the metal cross-sectional area , Resulting in increased cable diameter and cable weight, thus posing a safety issue for the strength of the line tower.
OPGW is affected by the short-circuit fault. When the line fault short-circuit current impacts the OPGW optical cable, the stainless steel unit is transiently heated. Therefore, the short-circuit current capacity of the optical cable must be increased to reduce the influence of the short-circuit fault on the optical cable. According to Q = I2t, but also by limiting the actual short-circuit current size and duration to improve the heat resistance of OPGW.
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