220kv power transmission line using energy-saving OPGW cable operation mode

Abstract

The invention discloses a 220 kV power transmission line using an energy-saving OPGW cable operation mode and relates to the technical field of the high-voltage power transmission line. The 220 kV power transmission line using the energy-saving OPGW cable operation mode comprises a tangent tower and a strain tower, the tower head of each of the tangent tower and strain tower is provided with a ground wire and an OPGW cable, the OPGW cable is insulated from the tangent tower through ground wire insulators in a mode of using tray as a unit, the joints between the cable trays are connected with the ground, the whole OPGW cable is continuous, on one part of the strain tower between each two joints, the positions of the OPGW cable and the ground wire are changed, at the position change part, the OPGW cable is fixed on the tower head through an insulated down-lead clip, and at the transformer substation export, the segment of the ground wire with larger short-circuit current is directly connected with the ground. According to the 220 kV power transmission line, although a loop is formed between the OPGW cable and the ground, the induced current is greatly lowered because of the counteracting of the induced voltage, the electric energy consumption is greatly lowered, the electrical performance difference of a system due to the grounding times of the shunting ground wire and OPGW is reduced, the lightning stroke probability of the OPGW is lowered in a certain degree, the cable running condition is improved, and the initial investment for the OPGW cable of the power transmission line is saved.

Description

Technical field: [0001] The invention relates to the technical field of high-voltage transmission lines, in particular to a 220kV transmission line adopting an OPGW optical cable energy-saving operation mode. Background technique: [0002] The 220kV transmission lines in my country are all designed with double ground wires. The ground wire operation mode of the initial transmission line is to ground the two ground wires tower by tower. Coupling with the electrostatic field will generate longitudinal induced electromotive force and electrostatic induced voltage of thousands of volts distributed along the ground on the ground, and the OPGW will form a ground loop with the ground induced current loop, which will cause a large induction loss on the transmission line. [0003] Later, in order to reduce the power loss of the ground wire of the transmission line, the operation mode of the ground wire was changed to a fully insulated operation mode. With the large-scale application o...

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Problems solved by technology

[0002] The 220kV transmission lines in my country are all designed with double ground wires. The ground wire operation mode of the initial transmission line is to ground the two ground wires tower by tower. Coupling with the electrostatic field will generate longitudinal induced electromotive force and electrostatic induced voltage of thousands of volts distributed along the ground on the ground, and the OPGW will form a ground loop with the ground induced current loop, which will cause a large induction loss on the transmission line

[0003] Later, in order to reduce the power loss of the ground wire of the transmission line, the operation mode of the ground wire was changed to a fully insulated operation mode. With the large-scale application of OPGW optical cables in transmission lines, 220kV transmission lines basically adopt ordinary ground wire segment insulation, and OPGW optical cables gradually Tower grounding method, but the main disadvantages of this kind of transmission line are: the operation mode of the OPGW optical cable of the transmission line is different from that of the ordinary ground wire, resulting in a small grounding resistance on the OPGW side. When a lightning strike occurs, the lightning current always chooses the OPGW side to enter the ground, so that The outer monofilament of the optical cable is frequently broken. In order to operate safely, the diameter of the outer monofilament of the optical cable must be increased, which leads to an increase in the initial investment of the transmission line project.

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