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Since optical fiber communication has many advantages, such as strong anti-interference ability, large transmission capacity, frequency bandwidth, low transmission loss and so on, it is first applied and developed rapidly in the power sector. In addition to ordinary optical fiber, some special special optical fiber is also used in power communication.
Special optical fiber refers to OPGW (fiber composite ground wire), OPPC (fiber composite phase line), MASS (metal self-supporting optical cable), ADSS (All-medium self-supporting optical cable), ADL (phase/ground bundle cable) and GWWOP (phase, ground wire winding cable) and so on. Currently。 In China, there are mainly ADSs and OPGW for special electric cables.
Fiber composite ground wire. Fiber-optic composite Ground--OPGW (Optiealgroundwire) OPGW, also known as ground wire composite optical cable, optical fiber overhead ground wire, etc., is in the power transmission line of the ground contains for communication of optical fiber unit. The overhead ground wire contains the optical fiber. It is reliable and does not need maintenance, but the one-time investment is large, suitable for new lines or old line replacement ground use.
It has two functions: first, as the Lightning protection line of transmission line, it can protect the transmission conductor against Xiao-ray Flashover; the second is to transmit the information through the fiber which is combined in the ground wire. OPGW is a composite of aerial and optical cables, but not the simple addition of them.
In addition to the optical properties of OPGW cable, it also fully satisfies the mechanical and electrical performance requirements of aerial grounding wire, so it can be applied to all transmission and distribution lines with overhead earthing wires. The optical fiber unit is placed in the protective tube or the metal skeleton, and is fully protected so that the fiber has high reliability and safety. OPGW when applied to new lines, construction costs are not increased.
OPGW is a High-tech product, abroad in recent years, the product research has made great progress, which makes us still have a lot of work to do. At the same time, the domestic demand for OPGW is also increasing, all of which portend a bright future for OPGW.
Fiber composite phase line. Fiber composite Phase line--In the power grid, some lines can not set aerial grounding, but phase line is essential.
In order to meet the requirements of fiber networking, similar to the OPGW technology, in the traditional phase-line structure in the appropriate way to add fiber, fiber composite phase line (OPPC). Although their structure is identical, but from design to installation and operation, OPPC and OPGW have the principle difference.
OPPC make full use of the power system's own line resources, avoid the contradiction with the outside, such as frequency resource, route coordination, electromagnetic compatibility, a new type of special power cable for power communication.
In the 1980s, some countries allowed the OPPC to be used in power systems under 150KV, and have been widely installed in Europe, the Americas and other countries. At present, it has been applied to higher voltage power lines.
In the current power grid in China, three-phase power system is generally used in the transmission line of 35KV, and the power communication of the system is carried out in traditional way. If using OPPC to replace one phase of three items, forming a three-phase power system composed of two wires and one OPPC, the automation, dispatch and communication of this kind of power network can be solved without the need of additional communication lines, and the quality and quantity of transmission can be greatly improved.
All-medium self-supporting cable. All-dielectric self-supporting optical cable--ADSS,ADSS optical cable in 220KV, 110KV, 35KV voltage transmission line widely used, especially in the established lines used more, for the power sector directly using High-voltage transmission pole Tower to build their own communications network provides a feasible way to cross rivers, valleys, Aerial laying in lightning concentrated area and special tensile environment.