A type selection method of transmission line opgw
A transmission line and ground wire technology, applied in the field of transmission line OPGW type selection, can solve the problems of inability to accurately judge the stability of the ground wire, calculation errors, and lack of comprehensive coverage, etc., to achieve a simple and easy selection method, ensure stability, The effect of increasing computational difficulty
Active Publication Date: 2017-11-17
STATE GRID CORP OF CHINA +1
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Problems solved by technology
However, due to the complexity of the calculation of the short-circuit current of the ground wire of the transmission line, the existing empirical formulas do not fully cover all the influencing factors, and cannot accurately judge whether the ground wire is stable, and the empirical formula is based on long-term measurements of low-voltage lines. , there is an error in the calculation of the OPGW type selection for the transmission line of the high-voltage line
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[0065] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0066] 1. Set up the combination of transmission line OPGW and shunt line.
[0067] Assuming the combination of transmission line OPGW and shunt line at the station entrance, the combination of transmission line OPGW and shunt line at the line needs to be changed. If the line is not long, the line change is not considered, and the whole line is a combination. Example: 5km near the station entrance, transmission line OPGW1 / / JLB1, 5~10km, transmission line OPGW2 / / JLB2, after 10km, transmission line OPGW2 / / GJ.
[0068] 2. Calculate the allowable short-circuit current of the transmission line OPGW and shunt line.
[0069] Calculate the allowable short-circuit current of the transmission line OPGW and the shunt line according to the respective parameters of the transmission line OPGW and the shunt line and the allowable curr...
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The invention relates to a model selection method for a power transmission line OPGW. The method includes the steps of (1) selecting a combination of the power transmission line OPGW and a shunt wire, (2) calculating allowable short-circuit currents, (3) calculating self-impedance, (4) calculating composite impedance, (5) calculating short-circuit currents allowed by a ground wire set, and (6) verifying the short-circuit currents. The model selection method for the power transmission line OPGW has the advantages that the self-impedance and the composite impedance of the power transmission line OPGW and the self-impedance and the composite impedance of the shunt wire are considered, and computational accuracy is high; meanwhile, the short-circuit currents of two kinds of ground wires are considered, so that the stability of model selection results is guaranteed; short-circuit current verification is carried out after model selection and comprises station port verification and wire exchange tower verification, and it is guaranteed that the ground wires in a line can stably act at any place under any condition; the computational difficulty is not increased, and the model selection method is simple and convenient to operate.
Description
technical field [0001] The invention relates to a type selection method of a power transmission line, in particular to a type selection method of a power transmission line OPGW. Background technique [0002] On the power line, the OPGW optical cable of the transmission line has the dual functions of ground wire and optical fiber communication. As a new information transmission channel, it has developed rapidly in some countries in recent years. In terms of communication, it has the characteristics of large communication capacity, anti-interference, high reliability, and does not occupy additional corridors; as a ground wire, it can meet the lightning protection requirements of ordinary ground wires, and has the shielding effect of a good conductor, which can reduce the transmission line electromagnetic influence. At present, due to the lack of a unified national standard model and the differences in the production processes of manufacturers, the electromechanical characteri...
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IPC IPC(8): G01R31/00
Inventor 马潇莫娟刘蕊黄彭金欢王宪
Owner STATE GRID CORP OF CHINA