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Anti-icing and de-icing method of split wire economic current

A technology of splitting wires and economical current, applied in the direction of electrical components, cable installation, overhead installation, etc., can solve the problems affecting the normal power supply of the line, and achieve the effect of increasing heat generation and increasing DC resistance

Active Publication Date: 2016-08-24
STATE GRID CORP OF CHINA +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the existing anti-icing and de-icing technology for split wires will affect the normal power supply of the line, and provide an economical current anti-icing and de-icing method for split wires

Method used

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  • Anti-icing and de-icing method of split wire economic current
  • Anti-icing and de-icing method of split wire economic current
  • Anti-icing and de-icing method of split wire economic current

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specific Embodiment approach 1

[0019] Specific implementation mode one: combine figure 1 and figure 2 Describe this embodiment, the method for economical current anti-icing and deicing of split conductors described in this embodiment is: install insulating spacers between adjacent split conductors, set a melting branch switch on each split conductor, and set one of them When a split conductor is performing an ice-melting operation, keep the ice-melting branch switch on the split conductor closed, and disconnect the ice-melting branch switches on other split conductors.

[0020] The electrical principle of the split conductor economic current anti-icing and deicing method described in this embodiment is as follows: figure 1 shown. figure 1 Among them, U is the power supply voltage; Z F is the load impedance; I F×2 is the total load current flowing through the double split wire; I F×1 is the branch current flowing through the single conductor of the double-split wire; K1 and K2 are the ice-melting branc...

specific Embodiment approach 2

[0031] Embodiment 2: This embodiment is a further limitation of the method for anti-icing and deicing with split wire economical current described in Embodiment 1. In this embodiment, the ice-melting branch switch is a 220KV outdoor GW7 isolating switch.

[0032] Calculation of the break voltage of the ice-melting branch switch K:

[0033] From the electrical schematic diagram of anti-icing and deicing, it can be seen that the voltage borne by the fracture of the ice-melting branch switch K is the voltage drop U of the ice-melting conductor r×1 . Double-split conductors are generally used in large-capacity transmission lines with a voltage level of 220KV and above. The load current they transmit is generally relatively large, and can basically reach the design value of economic current operation. The current density of the line is selected according to the economic current density. Take 0.8A~1.65A / mm2 per square millimeter, and run according to the economical current in normal ...

specific Embodiment approach 3

[0042] Specific implementation mode three: combination image 3 This embodiment is described. This embodiment is a further limitation of the split wire economical current anti-icing and deicing method described in Embodiment 1. In this embodiment, the ice-melting current of the above method is obtained through the following steps:

[0043] Step 1. Establish ice-melting power triangle

[0044] In the plane Cartesian coordinate system P x OP y An isosceles right-angled triangle is established in the interior, and this isosceles right-angled triangle is the described ice-melting power triangle, and the three apex coordinates of this ice-melting power triangle are respectively (0, 0), (P, 0) and (P, P r +P s ), where P is the input power for melting ice, P r Absorbed power for icing, i.e. the total power needed to heat up and melt the icing body, P s for wire heating and ambient loss power, then

[0045] Step 2. Set P Q is the initial power, and 0Q x Take a point on the a...

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Abstract

The invention relates to anti-icing and deicing technology for bundled conductors, discloses an economical current anti-icing and deicing method for the bundled conductors and solves the problem that existing bundled conductor anti-icing and deicing technology influences normal power supply of lines. The method includes that an insulated spacing rod is arranged between each two adjacent bundled conductors, an ice melting branch switch is arranged on each bundled conductor, and each ice melting branch switch is on during normal running; when ice melting operation is performed on one of the bundled conductor, the ice melting branch switch on the bundled conductor is maintained on, the ice melting branch switches on other bundled conductors are off, and ice melting branches conveys all current, so that the bundled conductors are enabled to realize anti-icing and deicing under the condition of normal power supply of the lines; relation between conductor temperature increase and time after the conductors are deiced, ice melting power and ice melting current are acquired by building an ice melting power triangle, and calculation error is smaller than 10%, so that a basis is provided for engineering application. The economical current anti-icing and deicing method is suitable for economical current anti-icing and deicing of the bundled conductors.

Description

technical field [0001] The invention relates to anti-icing and de-icing technology for split wires. Background technique [0002] my country has widely used split wires to transmit electric energy. Due to the skin effect of the current conveyed by wires, the transmission capacity and economic benefits of using split wires to transmit electricity are significantly better than single wires. Since 2008, power grid icing accidents caused by atmospheric icing weather have occurred frequently in my country. In order to prevent accidents such as ice-coated disconnection, downed towers, and ice-coated flashovers on power lines, the research on anti-icing technology for power transmission and distribution lines has been comprehensively carried out and considerable progress has been made. At present, the research work on icing prevention and control of power grids mainly focuses on the physical properties of icing on a single conductor, the accumulation and growth of icing, and the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02G7/16
CPCH02G7/16
Inventor 刘刚姜世金陈永辉赵学增周丽滨李军刘勇军孙福军田伟刘建军迟连道
Owner STATE GRID CORP OF CHINA