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Realization method of capacity expansion operation of 220-500kV lines

An implementation method and line technology, applied in the directions of cable installation, overhead installation, electrical components, etc., can solve problems such as improving transmission capacity, old lines getting stuck, and power outages.

Inactive Publication Date: 2014-01-22
STATE GRID CORP OF CHINA +2
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0002] During the operation of the current power grid, the maximum allowable operating temperature of the conductors of overhead transmission lines is 70°C. Due to the rapid increase in power load, the phenomenon of "stuck necks" in many places on the original old lines has brought great harm to the development of the national economy. influences
At the same time, since the transmission capacity of a unit line is mostly a fixed value during the power grid dispatching process, when an "N-1" fault occurs in the power grid, other sections are also limited by the maximum transmission capacity and cannot increase the transmission capacity in a short time. Cause large-scale power cuts

Method used

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  • Realization method of capacity expansion operation of 220-500kV lines

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Embodiment Construction

[0083] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0084] This embodiment provides a method for realizing the capacity-enhancing operation of a 220-500kV line. According to the current-carrying theory, an experimental method for verifying the relationship among the actual current-carrying capacity, temperature, and sag of the conductor is researched and invented. On the basis of Morgan's formula, the calculation method of short-time overload current of conductor is obtained. The specific implementation is as follows:

[0085] First of all, it is assumed that in a steady state, the sum of the heat lost by the wire resistance and the absorbed solar heat should be equal to the sum of the radiation heat dissipation and air convection heat dissipation of the wire, and the heat balance equation of the wire is:

[0086] Q R +Q S =Q f +Q d

[0087] Of which: Q R Indicates the heating power of the wire resi...

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Abstract

The invention relates to a realization method of capacity expansion operation of 220-500kV lines. The transmission capacity of the lines can be improved by allowing the maximum permissible operation temperature of a lead wire to achieve 80 DEG C under the condition that the existing power grid resource is fully used; in addition, the transmission capacity of the lines is controlled by monitoring conditions such as different ambient temperatures where the lines are located and the real-time operation temperature of the lead wire, so that operation scheduling personnel can grasp operation conditions of the lines in real time; the transmission capacity of each unit line is improved under lower investment increase; and the method has good reference significance in improving the transmission capacity of the built-up line, lowering the investment of the newly-built line, and solving the problems of line corridor shortage, electric power construction and local planning contradiction, as well as frequent heavy load and overload of a residual section when certain areas or a certain section has N-1 failures.

Description

technical field [0001] The invention relates to the technical field of power line capacity increase, in particular to a method for realizing the capacity increase operation of a 220-500kV line. Background technique [0002] During the operation of the current power grid, the maximum allowable operating temperature of overhead transmission line conductors is 70°C. Due to the rapid growth of electricity load, the phenomenon of "jamming" appears in many places in the original old lines, which brings great impact to the development of the national economy. influences. At the same time, in the process of grid dispatching, the transmission capacity of a unit line is mostly a fixed value. When the “N-1” fault occurs in the power grid, other sections cannot improve the transmission capacity in a short time due to the limitation of the highest transmission capacity. Cause a wide range of power outages. SUMMARY OF THE INVENTION [0003] The purpose of the present invention is t...

Claims

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Application Information

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IPC IPC(8): H02G7/00
Inventor 唐自强李庆先陈卫东石建
Owner STATE GRID CORP OF CHINA
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