Design method for matching optical fiber composite overhead ground wires with common ground wire

Abstract

The invention relates to a design method for matching optical fiber composite overhead ground wires with a common ground wire. The method comprises the following steps: (1) a structure design stage of determining the optical fiber composite overhead ground wires, wherein the matching degree of electrical performance parameters and mechanical performance parameters of the optical fiber composite overhead ground wires and a shunt ground wire is in the matching range and the optical fiber composite overhead ground wires meet the circuit design requirement; (2) an optimizing and selecting stage of determining to sort the optical fiber composite overhead ground wires according to an optimization target and calculating dynamic sag difference verification in the thermal effect and engineering; and (3) a test verification stage of carrying out test verification on the optical fiber composite overhead ground wires which are sorted according to the optimization target. The method provided by the invention is beneficial for ensuring the operating quality of an OPGW (Optical Fiber Composite Overhead Ground Wire) cable, reducing the accident occurrence rate, prolonging the service life of the cable and regulating the OPGW design selection and engineering construction and has important significance on ensuring the safe and stable operation of a power telecommunication network.

Description

technical field [0001] The invention relates to a design method, in particular to a design method for matching an optical fiber composite overhead ground wire and a common shunt ground wire. Background technique [0002] Double ground wires are commonly used in transmission lines of 110kV and above. In the past, when designing the ground wire, two identical cables were selected, and the same grounding method was adopted, which could evenly bear the short-circuit current and lightning strikes. In the dual ground wire system, the mechanical and electrical parameters of the optical fiber composite overhead ground wire (OPWG) introduced can only be as close as possible to the common shunt ground wire, the cable diameter, dead weight, rated tensile strength, elastic modulus , linear expansion coefficient, DC resistance, heat capacity, etc. are always different, and sometimes they are mutually restrained. The mismatch of parameters leads to problems such as uneven distribution o...

AI Technical Summary

Problems solved by technology

[0007] At present, the transmission line ground wire system usually adopts the cooperation of optical fiber composite overhead ground wire and ordinary shunt ground wire, but there is no unified design standard for optical fiber composite overhead ground wire and ordinary shunt ground wire. Among them, the mechanical and electrical parameters of the introduced optical fiber composite overhead ground wire and the common shunt ground wire can only be as close as possible

Due to the mutual constraints among the parameters of the optical fiber composite overhead ground wire, if there is no comprehensive analysis and unified design during project construction, the overall performance of each other will not be well matched, and it is easy to produce optical fiber composite overhead ground wire and ordinary shunt Problems such as uneven distribution between ground wires and increased probability of lightning strikes for optical fiber composite overhead ground wires

If the service life of the optical cable is calculated on the basis of 30 years, the service life of the optical fiber composite overhead ground wire will be greatly reduced due to lightning strikes, broken strands or short-circuit faults.

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