CN202840439U

CN202840439U - Double ground wire connecting system

Info

Publication number: CN202840439U
Application number: CN201220431483.7U
Authority: CN
Inventors: 陈�光; 张林枫
Original assignee: Northeast Electric Power Design Institute of China Power Engineering Consulting Group
Current assignee: Northeast Electric Power Design Institute of China Power Engineering Consulting Group
Priority date: 2012-08-29
Filing date: 2012-08-29
Publication date: 2013-03-27
Anticipated expiration: 2022-08-29

Abstract

The utility model discloses a double ground wire connecting system. The connecting system comprises towers, a common ground wire and an optical fiber composite overhead ground wire, wherein the common ground wire and the optical fiber composite overhead ground wire are suspended at two sides of the tops of the towers through ground wire insulators. Two insulated ground wires are communicated with each other along lines, and are grounded at two ends of an electric transmission line through drainage coils; and the ground wires realize transposition by arranging high and low pin insulators on tensile-resistant tower heads. With the double ground wire connecting system, channel impedance of the OPGW is increased, a lightning protection effect of the OPGW is enhanced, an induced current and a return current of the ground wires when a line-to-ground short-circuit fault appears are decreased so as to reduce the zero sequence impedance of the wires, and an electromagnetic shielding effect for adjacent weak current lines is improved. By arranging the high and low pin insulators on the tensile-resistant tower heads to change the positions of the ground wires, an induced voltage and an induced ring current can be reduced greatly, and electric energy loss of the ground wires is decreased. The two ground wires are both insulated to the tower and are communicated with one another along lines, so that an ice-melting power supply can be provided by a specialized ice-melting transformer and used for melting ice of the overhead ground wire directly.

Description

A kind of double earth wire connected system

Technical field

The utility model relates to the double earth wire connected system that a kind of ultra-high-tension power transmission line is used, and is the double earth wire system that consists of to Optical Fiber composite overhead Ground Wire (OPGW) and common ground wire specifically.

Background technology

Overhead ground wire is the important component part of transmission line.Set up ground wire and originally mainly be used for lightning protection by tower grounding; have concurrently and reduce the circuit zero sequence impedance, reduce power-frequency overvoltage, reduce the effects such as interference effect to communications facility; along with the development of optical-fibre communications, overhead ground wire has been quoted Optical Fiber composite overhead Ground Wire (OPGW).

The common ground wire graded insulation of more employing, OPGW reduce the ground wire loss by the technology of tower ground connection in the engineering at present, but this mode will make and can induce with downward guide the opposite polarity charges of different polarity more on the OPGW, the electric field of the two is strengthened, cause lightning discharge to be easier to occur at OPGW, thereby easily make the 0PGW disconnected thigh that is struck by lightning affect the reliable communication of electric power system.

When transmission line normally moved, phase current produced induced electromotive force by magnetic coupling in ground wire.If ground wire then can form the loop by the earth between ground wire and the ground wire by the direct ground connection of shaft tower, under the driving of ground wire induced electromotive force, can produce induced current in ground wire and the steel tower, cause electric energy loss.

Though overhead ground wire and wire are located same environment, to resist part freezing because can produce heat energy with load current on the transmission line, therefore the transmission pressure head and shoulders above of the ice covering thickness on the overhead ground wire.When the icing on the overhead ground wire acquires a certain degree, can cause ground wire broken string or since the sag deficiency to line discharge.Because power telecom network is compounded in the overhead ground wire at present, if there are not effective ice-melt means, the ground thread breakage will cause power communication channel to interrupt the normal operation that jeopardizes electric control system.Therefore, in time deicing of overhead ground wire.

The utility model content

The purpose of this utility model provides a kind of double earth wire connected system, to reach the effect of ground wire lightning protection, energy-conservation, deicing.

For achieving the above object, the utility model provides a kind of double earth wire connected system, it is characterized in that: comprise shaft tower and be suspended on common ground wire and the Optical Fiber composite overhead Ground Wire of both sides, shaft tower top by ground insulator, two thoroughly do away with every of edge ground wire is interconnected along the line, and at the transmission line two ends through drainage coil ground connection, ground wire replaces at strain tower by high and low pin insulator is set.

With respect to background technology, advantage of the present utility model is as follows:

1) common ground wire and Optical Fiber composite overhead Ground Wire (OPGW) all insulate completely by ground insulator, have improved the channel impedance of OPGW, improve the lightning protection effect of Optical Fiber composite overhead Ground Wire (OPGW).

2) two every of eradication edge ground wire are interconnected along the line, and at the transmission line two ends through drainage coil ground connection, the induced current of ground wire and return current improve the electromagnetic shielding action to contiguous light current circuit to reduce the circuit zero sequence impedance when having reduced the line-to-ground short trouble.

3) by arrange the height pin insulator on the strain insulator tower head with ground wire transposition.Can greatly reduce like this induced voltage and induction circulation, reduce the electric energy loss on the ground wire.

4) when the ground wire icing, because two ground wires all are interconnected to shaft tower insulation and every, can use special-purpose ice-melt transformer that the ice-melt power supply is provided, directly to the overhead ground wire ice-melt along the line.

Description of drawings

Fig. 1 is structural representation of the present utility model;

Fig. 2 is ground wire transposition structural representation of the present utility model.

Embodiment

With reference to Fig. 1, Fig. 2, the utility model comprises shaft tower 1 and is suspended on common ground wire 2 and the Optical Fiber composite overhead Ground Wire 3 of both sides, shaft tower top by ground wire suspension insulator 4, ground wire strain insulator 5, two thoroughly do away with every of edge ground wire is interconnected along the line, and at the transmission line two ends through drainage coil 7 ground connection, the voltage on the Ground wire with insulation ocver, the minimizing of electric current adopt the lead wire and earth wire transposition to solve.This practicality is new as follows with novel concrete operation method:

(1) common ground wire 2, Optical Fiber composite overhead Ground Wire 3 all insulate, insulate by ground wire strain insulator 5 and strain rod tower 6 by ground wire suspension insulator 4 and straight line pole 1.

(2) two thoroughly do away with every of edge ground wire is interconnected along the line, and at the transmission line two ends through drainage coil ground connection.

(3) wire more rationally replaces according to line length.Ground wire should be on strain tower 6 tower heads by high pin insulator 8 is set, low pin insulator 9 replaces, can the ground wire wire jumper with steel wire lashing in the pin insulator groove.Ground wire answers interval 5-10km to replace.

Claims

1. double earth wire connected system, it is characterized in that: comprise shaft tower and be suspended on common ground wire and the Optical Fiber composite overhead Ground Wire of both sides, shaft tower top by ground insulator, two thoroughly do away with every of edge ground wire is interconnected along the line, and at the transmission line two ends through drainage coil ground connection, ground wire replaces at strain tower by high and low pin insulator is set.