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Device and method for rapidly melting ice and snow of transmission line

A transmission line and transmission wire technology, applied in the installation of cables, electrical components, overhead installation, etc., can solve the problems of easily damaged transmission lines, unsafe operation, troublesome operation, etc., to achieve safe and convenient, simple operation, simple installation. Effect

Inactive Publication Date: 2011-11-02
潘明清
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the disadvantages of unsafe, unreliable, easily damaged transmission lines, and troublesome operation in the above-mentioned existing production, the applicant provides a method for quickly melting ice and snow on transmission lines that is easy to operate, so that wires and cables can be used in snowstorms, freezing rain, etc. Eliminate the occurrence of icing and overloading under severe weather conditions, ensure the normal operation of the power system under severe weather conditions, and provide a strong power guarantee for the national disaster prevention and reduction work and the normal operation of the economy and society

Method used

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  • Device and method for rapidly melting ice and snow of transmission line
  • Device and method for rapidly melting ice and snow of transmission line
  • Device and method for rapidly melting ice and snow of transmission line

Examples

Experimental program
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Effect test

Embodiment 1

[0049] Measure the distance between the two substations to be 50km, and the section of the transmission wire to be 50mm 2 , The wire heating power is 60w / m.

[0050] The calculation process is as follows:

[0051] (1) Total resistance of a single wire: R=r×L =0.387Ω / km ×50km=19.35Ω (50mm 2 The resistance value of the transmission wire per kilometer is r≈0.387Ω);

[0052] (2) Total power of a single wire: P= Pm×L=60w / m×50km=3000kw; where P is the total heating power of a single wire, Pm is the heating power per meter of a wire, and L is the total heating power of a single wire length;

[0053] (3) The line voltage U of the heating wire 线 ===7619V, the phase voltage U of the three-phase heating wire 相 =×U 线 =1.732×7619≈13200V;

[0054] (4) The current of the heating wire: I=U 线 / R=7619 / 19.35=393.7A, the current carrying capacity per square unit of the heating wire: i=I / S=393.7 / 50=7.87A, where S is the cross-sectional area of ​​the wire mm 2 ;

[0055] (5) Three-phase...

Embodiment 2

[0058] The distance between the two substations is 50km, and the cross section of the input conductor is 300mm 2 , The wire heating power is 100w / m.

[0059] The calculation process is as follows:

[0060] (1) The total resistance of a single wire R= r×L =0.0601×50=3.005Ω (300 mm 2 The resistance value per kilometer of the copper core wire r≈0.0601Ω);

[0061] (2) The total power of a single wire P = Pm × L = 100w / m × 50km = 5000kw; where P is the total heating power of a single wire, Pm is the heating power per meter of the wire, and L is the total length of a single wire ;

[0062] (3) The line voltage U of the heating wire 线 ===3876V, the phase voltage U of the three-phase heating wire 相 =×U 线 =6714V;

[0063] (4) The current of the heating wire: I=U 线 / R=3876 / 3.005=1289.85A, current carrying per square unit of the heating wire: i=I / S=1289.85 / 300≈4.3A, where S is the cross-sectional area of ​​the wire mm 2 ;

[0064] (5) Three-phase total power of heating wire: ...

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Abstract

The invention relates to a device and a method for smelting the ice and snow of a transmission line. An ice and snow melting transformer and a selector switch are connected to the front end of the transmission line, and are positioned behind a first transformer and a main switch of the conventional transmission line. The rear end of the transmission line is provided with a three-phase connected and grounded lines before a conventional final transformer. When the main switch is switched off, the selector switch and the grounded line are switched on, and the transmission line forms a three-phase Y-connected circuit. By the device and the method, the ice coating overload phenomenon of electric wires and cables is eliminated under the severe weather conditions such as snowstorms, frozen rain and the like, a power system is ensured to be normally run under the severe weather conditions, and powerful power protection is provided for the normal running of national disaster prevention and reduction work and the economic society.

Description

technical field [0001] The invention relates to the field of protection devices for transmission lines, in particular to the protection against damage caused by ice and snow on overhead transmission lines. Background technique [0002] Every winter, the transmission lines in various places will be damaged by ice and snow. The transmission lines will be covered with thick ice edges, which will aggravate the wires, cause circuit breaks, and even cause accidents such as the collapse of power supply towers, which seriously affect the transmission performance and cause large-scale power outages. Affect industrial and agricultural production and residential electricity consumption. [0003] The southern blizzard in January 2008 caused the collapse of power supply towers and disconnection of power supply lines, involving power outages in more than 90 counties and cities, resulting in suspension of trains, suspension of TV broadcasts, interruption of communications, social life into...

Claims

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Application Information

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IPC IPC(8): H02G7/16
Inventor 潘明清潘玲
Owner 潘明清
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