Energy-saving running method suitable for OPGW (optical fiber composite overhead ground wire) cable of 220kV electric transmission line

Abstract

The invention provides an energy-saving running method suitable for an OPGW (optical fiber composite overhead ground wire) cable of a 220kV electric transmission line, and relates to the technical field of high-tension transmission lines. By using the scheme, the OPGW cable is insulated from a tangent tower through a ground wire insulator by using a plate as a unit; connection points of plates serve as grounding points during grounding; the whole OPGW cable runs through continuously; the position of the OPGW and the position of a ground wire are changed on an optional tension support between the two grounding points; the OPGW cable is fixed by using an OPGW cable insulating downlead at a position changing site, so that the OPGW cable is insulated from a support head; and ground wires are directly grounded at a short-circuit high-current section of an exit of a transformer substation. Because induced electromotive force is greatly reduced, only weak induced current exists, electric energy loss is small, difference between the system electric performance of the shunt ground wires and the system electric performance of the OPGW cable due to the grounding frequency is reduced, and the probability of lightning stroke on the OPGW cable is reduced to a certain degree, running conditions of the cable are improved, and the annular cost of the OPGW cable is minimum within the life cycle.

Description

Technical field: [0001] The invention relates to the technical field of high-voltage transmission lines, in particular to an energy-saving operation method for OPGW optical cables of 220kV transmission lines. Background technique: [0002] my country's 220kV transmission lines are all designed with double ground wires. When the transmission lines are in normal operation, the OPGW optical cables are all grounded tower by tower. In this case, there will be the following disadvantages: [0003] 1. A closed loop is formed between the ground wire and the earth. Under the action of the induced electromotive force, an induced current will be generated on the ground wire, resulting in a certain amount of power loss. [0004] 2. Due to the difference in the operation mode of the OPGW optical cable and the ordinary ground wire, the grounding resistance on the OPGW side is small. When a lightning strike occurs, the lightning current always chooses the OPGW side to enter the ground, res...

AI Technical Summary

Problems solved by technology

[0003] 1. A closed loop is formed between the ground wire and the earth. Under the action of the induced electromotive force, an induced current will be generated on the ground wire, resulting in a certain power loss

[0004] 2. Due to the different operation modes of the OPGW optical cable and the ordinary ground wire, the grounding resistance on the OPGW side is small. When a lightning strike occurs, the lightning current always chooses the OPGW side to enter the ground, so that the outer layer of the optical cable has a frequent failure of the single wire to break

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