Current ice-melting method for overhead ground wires of electric transmission line

A technology of overhead ground wire and ice melting method, which is applied in overhead installation, installation of electrical components, cables, etc., can solve problems such as poor deicing effect, avoid flashover of transmission lines, solve icing, and facilitate implementation Effect

Active Publication Date: 2012-11-14
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Some also use mechanical deicing method, passive deic

Method used

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  • Current ice-melting method for overhead ground wires of electric transmission line
  • Current ice-melting method for overhead ground wires of electric transmission line
  • Current ice-melting method for overhead ground wires of electric transmission line

Examples

Experimental program
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Embodiment Construction

[0028] The present invention will be further described below in conjunction with the drawings:

[0029] figure 1 This is a specific flow diagram of step S1) of the present invention. Step S1) mainly needs to determine the melting length of the overhead ground wire to be melted, determine the melting power supply voltage, select a ground insulator with appropriate mechanical strength, and determine its protection gap distance d, the specific steps are as follows:

[0030] S1.1) According to its load, material requirements and installation methods, select ground insulators with appropriate mechanical strength;

[0031] S1.2) Select the ice melting power voltage according to the degree of ice coating on the overhead ground wire and the length of the ice melting;

[0032] S1.3) Determine the protective gap distance d of the ground insulator according to the ice melting power supply voltage;

[0033] S1.4) Determine whether the discharge voltage of the protective gap distance d is less than...

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PUM

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Abstract

The invention discloses a current ice-melting method for overhead ground wires of an electric transmission line. The method mainly includes following steps that by means of ground wire insulators, each of the overhead ground wires is down led in an insulation mode and grounded through grounding knife switches; the overhead ground wires are reliably grounded through the closed grounding knife switches when the electric transmission line is in normal operation; the grounding knife switches break, and the overhead ground wires are to ground insulation during ice melting; and a tail end of an overhead ground wire requiring ice melting is in short circuit with another nearby overhead ground wire or a shutdown transmission line, a starting end of the overhead ground wire requiring ice melting and the another nearby overhead ground wire or the shutdown transmission line are connected with an ice melting power supply to form an ice melting loop to start the ice melting power supply, and ice-melting currents are generated in the ice melting loop and used for working and heating to achieve ice melting. According to the current ice-melting method for the overhead ground wires of the electric transmission line, the ice-melting currents are loaded to the overhead ground wires to heat the overhead ground wires to rise temperatures so that covered ice on the overhead ground wires can be effectively melted.

Description

Technical field [0001] The invention relates to a method for melting ice on an overhead ground wire of a power transmission line, which is suitable for ice melting on a transmission line with a single overhead ground wire or two overhead ground wires. Background technique [0002] The current of the overhead ground wire of the transmission line is much smaller than that of the transmission wire, so it is easier to get ice. The sag of the overhead ground wire after icing becomes larger, which cannot meet the sag requirement of the transmission line for its overhead ground wire. When the wind blows, flashover is prone to occur between the transmission wire of the transmission line and the overhead ground wire. Tripping of the transmission line affects the normal operation of the transmission line and may damage the transmission line. In addition, if the spans at both ends of the tower are unequal or the tower is located in a mountainous area, the overhead ground wire is icing and ...

Claims

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Application Information

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IPC IPC(8): H02G7/16
Inventor 徐晓刚王宇彭向阳姚森敬王建国毛先胤麦晓明薛健李志峰李显强
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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