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Device and method for performing DC ice melting on overhead ground wire of power transmission line

An overhead ground wire, DC ice-melting technology, applied in the direction of overhead installation, cable installation, electrical components, etc., can solve the problems of high cost of ground wire insulation and segmental transformation, long time of ice-melting operation, etc., to reduce line maintenance Effects of cost, increased selection flexibility, and reduced short-circuit time

Active Publication Date: 2017-02-08
EXAMING & EXPERIMENTAL CENT OF ULTRAHIGH VOLTAGE POWER TRANSMISSION COMPANY CHINA SOUTHEN POWER GRID
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the defects of the existing ground wire melting, such as the high cost of ground wire insulation and segmental transformation, and the long time of ice melting operation. Device and method, concrete technical scheme is as follows:

Method used

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  • Device and method for performing DC ice melting on overhead ground wire of power transmission line
  • Device and method for performing DC ice melting on overhead ground wire of power transmission line

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Such as figure 1 As shown in the figure, a device for DC deicing the overhead ground wire of transmission lines, including 5 segmented towers, overhead ground wires, AC three-phase power supply, DC deicing device, first wire, second wire, segmented ground line, grounding knife switch KG, automatic wiring device KN; the five segmented towers are segmented tower 1, segmented tower 2 ... segmented tower 5, and the first wire, the second wire and The power grid is isolated and insulated from the ground, the short-connection point of the first wire is on the even-numbered segment tower, the short-connection point of the second wire is on the odd-numbered segment tower, and the overhead ground wire is insulated from the ground and divided The segment is grounded through a plurality of grounding knife gates KG, each of the segmented towers is short-circuited with the first conductor or the second conductor and the overhead ground wire through an automatic wiring device KN, and...

Embodiment 2

[0024] Such as figure 2 As shown, the difference from Embodiment 1 is that for a special section with a shorter distance between the segmented towers (generally less than 10 km), the two sides of the segmented overhead ground wire are connected in series and connected in parallel between the first conductor and the second conductor.

Embodiment 3

[0026] A method for direct current melting of overhead ground wires of power transmission lines, comprising the following steps:

[0027] S1) Operate and confirm that the first conductor, the second conductor and the overhead ground wire are isolated from the power grid, and open all the grounding knife switches KG to insulate the entire overhead ground wire from the ground;

[0028] S2) Close the automatic wiring device KN that needs to melt the ice segment to short-circuit the first wire, the second wire and the overhead ground wire;

[0029] S3) Close the ice-melting device and connect it to the knife switch K, start the DC ice-melting device to output the minimum ice-melting current, and gradually increase the DC current within the range of the minimum ice-melting current and the maximum ice-melting current according to the site conditions until the ice cover melts and falls off, Stop the output of the DC ice-melting device, and disconnect the switch K to isolate the first...

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Abstract

A device for performing DC ice melting on an overhead ground wire of a power transmission line comprises the components of N segmented towers, the overhead ground wire, an AC three-phase power supply, a DC ice melting device, a first lead wire, a second lead wire, a segmented ground wire, grounding disconnecting links KG and an automatic wiring device KN. The overhead ground wire is insulated to the ground and is grounded through a plurality of grounding disconnecting links. Each segmented tower realizes shortcircuit between the first lead wire or the second lead wire and the overhead ground wire through the automatic wiring device KN. At least one segmented ground wire is parallelly connected or at least one segmented ground wire is connected in series at each shortcircuit portion. The automatic wiring devices KN are switched on and switched off through signals. The device has advantages of reducing ground wire ice melting line shortcircuit time and shortcircuit device cost by more than one time, greatly improving ice melting segment selection flexibility, preventing disconnection and connection of an optical cable in the OPGW ground wire for satisfying an ice melting requirement, and reducing line maintenance cost.

Description

technical field [0001] The invention relates to the technical field of direct current melting of overhead ground wires of power transmission lines, in particular to a device and method for direct current melting of overhead ground wires of power transmission lines. Background technique [0002] In recent years, due to climate change, large-scale low-temperature rain, snow and freezing disasters have frequently occurred in southern China in winter, which has had a very serious impact on the normal operation of the power grid. It takes a long time and a lot of manpower to repair accidents such as disconnection, short circuit, tower collapse and even system disassembly caused by icing on transmission wires. Among them, the icing situation of the overhead ground wire in the power grid is the most serious. Therefore, the anti-icing technology of overhead ground wires has received more and more attention. [0003] At present, the DC deicing is mainly to deicing the AC transmissi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02G7/16
CPCH02G7/16
Inventor 唐金昆卢志良梁宁彭茂兰顾保全
Owner EXAMING & EXPERIMENTAL CENT OF ULTRAHIGH VOLTAGE POWER TRANSMISSION COMPANY CHINA SOUTHEN POWER GRID