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Comparison of Application of Optical Fiber Composite Overhead Ground Cable and All-dielectric Self-supporting Optical Fiber Cabl




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Comparison of Application of Optical Fiber Composite Overhead Ground Cable and All-dielectric Self-supporting Optical Fiber Cabl

2018/01/30 14:06

The smart grid is known as the “energy internet”. It is known for its strong, widely interconnected, highly intelligent, and open and interactive features. It is called the base platform that carries the third industrial revolution and has an overall perspective on the third industrial revolution. Promote the role. The smart grid is inseparable from the robustness and optimization of the power communication system, which is also one of the prerequisites for implementing a smart grid. In order to meet the special needs of power system communications, special power cable has emerged.


Power special optical cable is set up through the power line system's unique line tower resource. It is attached to the power line and the optoelectronic composite optical cable attached to the power pole tower, making full use of the overhead power line corridor. Power special optical fiber cable makes full use of the unique resources of the power system and is closely integrated with the power grid structure. It is economical, reliable, fast, and safe. Power special optical cables are less likely to be damaged by external forces and have high reliability. Although their own cost is relatively high, the cost of construction is low. Power special optical cables are installed on various power pole towers with different voltage levels. Compared with ordinary optical cables, there are special requirements for their electrical characteristics, mechanical characteristics and optical fiber characteristics.


The special optical cable relies on its own line resources to avoid contradictions and disputes with the outside world in terms of frequency resources, route coordination, and electromagnetic compatibility, and has great initiative and flexibility.


Power special optical cables are divided into optical fiber composite overhead ground wires OPGW, optical fiber composite overhead overhead wires OPPC, all-metal self-supporting optical cables MASS, all-media self-supporting optical cables ADSS, ground bundled optical cables ADL, and ground-wound cable GWWOP and other kinds.


OPGW optical fiber cable is mainly used on 500kV, 220kV, 110kV voltage grade lines, which are affected by factors such as line blackout and security, and are mostly applied on newly-built lines. The prominent feature of the OPGW composite cable is to integrate the overhead cable on the communication cable and the high-voltage transmission line, integrate the optical cable technology with the transmission line technology, and become a multi-functional overhead ground wire, which is not only a lightning protection line, but also It is an overhead cable, and it is also a shielded cable. While completing the construction of high-voltage transmission lines, it also completed the construction of communication lines, which is very suitable for new transmission lines. There are three major types of common OPGW structures, namely, aluminum pipes, aluminum frames, and (stainless) steel pipes.


The applicable features of OPGW are: (1) Lines with high voltage exceeding 110kV have large spans (usually above 250M); (2) Easy to maintain, easy to solve for line crossing problems, and their mechanical characteristics can satisfy large span of lines; ( 3) The outer layer of OPGW is metal armored, which has no impact on high-voltage corrosion and degradation; (4) OPGW must be powered off during construction, and the loss of power outage is large. Therefore, OPGW should be used in new high-voltage lines over 110kV; (5) In OPGW's performance index, the larger the short-circuit current is, the more it needs to be armored with good conductors, the lower the corresponding tensile strength, and in the case of certain tensile strength, the short-circuit current capacity must be increased, only the metal cross-sectional area can be increased. As a result, the cable diameter and cable weight increase, which raises a safety issue for the strength of the cable tower.


The OPGW is affected by a short-circuit fault. When the short-circuit current of the line fault strikes the OPGW cable, the stainless steel unit is instantaneously high in temperature, and the short-circuit current capacity of the optical cable must be increased to reduce the impact of the short-circuit fault on the optical cable. According to Q=I2t, the heat resistance of the OPGW can also be improved by limiting the size and duration of the actual short-circuit current.