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Erection method and erection system of overhead conductor considering creep quantity

An overhead wire and wire technology, which is applied in the direction of overhead lines/cable equipment, etc., can solve the problems of inability to meet safe operation, difficulty in estimating wire elongation, and excessive sag.

Active Publication Date: 2019-09-10
CHINA ELECTRIC POWER RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the lack of experience and theoretical basis, it is more and more difficult to estimate the elongation of the wire during line design
For example, if the cooling value used in the actual stringing process is too large, the initial stress of the stringing will be higher, and the line will run under high stress in the initial stage, and the requirements for wires, fittings and iron towers will be higher, and the requirements for anti-vibration will also be higher; Or if the cooling value is too small, the sag of the line will be too large after long-term operation, resulting in insufficient distance to the ground and crossing objects, which cannot meet the requirements of safe operation

Method used

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  • Erection method and erection system of overhead conductor considering creep quantity
  • Erection method and erection system of overhead conductor considering creep quantity
  • Erection method and erection system of overhead conductor considering creep quantity

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] A schematic flow chart of an overhead conductor erection method considering creep provided by the present invention is as follows figure 1 shown, including:

[0056] Step 1: Determine the creep characteristics of the wire through the wire creep test at different temperatures, and obtain the equivalent time hardening creep rate equation of the wire;

[0057] Step 2: Based on the creep equation, calculate the creep amount during the running process of the wire and the creep amount during the running process of the wire, and obtain the creep amount during the wire tension unwinding process and the wire running process;

[0058] Step 3: Conduct overhead line conductor erection based on the creep value during conductor tension pay-off and conductor running.

[0059] Specifically, the erection methods of overhead conductors considering creep include:

[0060] Step 101: Determining the size a of the creep amount per unit time and the slope b of the creep rate equation in log...

Embodiment 2

[0108] Firstly, the creep characteristics of the wire are determined by creep test. Set the test temperature as 20°C, 40°C and 60°C respectively, and the plus or minus error shall not exceed 2°C; according to the material and cross section of the wire, check the table to determine the wire breaking force RTS; select 25% and multiply the wire breaking force RTS to get Test the tension and keep it constant; measure the creep (deformation) elongation of the wire under 3 temperature conditions within 1000 hours, and sample a set of data every 2 hours; the creep ε is a function of the creep time t, determined by the creep rate Equation ε = a t b Determined, where ε represents the elongation of the wire per unit time due to creep, a represents the size of the creep amount per unit time, and b represents the slope of the creep rate equation in double-logarithmic coordinates, representing the speed of creep with time , t represents the duration of creep of the wire; taking the logari...

Embodiment 3

[0111] Based on the same inventive concept, the present invention also provides an overhead conductor erection system considering creep. Since the principle of solving technical problems of these devices is similar to the overhead conductor erection method considering creep, the repetition will not be repeated.

[0112] The basic structure of the system is as figure 2 As shown, including: equation determination module, creep calculation module and conductor erection module;

[0113] Among them, the equation determination module is used to determine the creep characteristics of the wire through different temperature wire creep tests, and obtain the equivalent time hardening creep rate equation of the wire;

[0114] The creep calculation module is used to calculate the creep amount during the running process of the wire and the creep amount during the running process of the wire based on the creep equation, and obtain the creep amount during the wire tension unwinding process a...

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Abstract

The invention provides an erection method and an erection system of an overhead conductor considering creep quantity. The method comprises the steps of determining a creep characteristic of the conductor by different temperature conductor creep tests to obtain an equivalent time conductor hardening creep rate equation, respectively calculating creep quantity in an operation process of the conductor and creep quantity in an operation process of the conductor based on the creep equation to obtain creep quantity in a tensile pay-off process of the conductor and the creep quantity in the operationprocess of the conductor, and performing overhead line conductor erection based on the creep quantity in the tensile pay-off process of the conductor and the creep quantity in the operation process of the conductor. With the adoption of the method and the system, the overhead conductor can be well erected, and a safe operation requirement is met.

Description

technical field [0001] The invention belongs to the technical field of wire erection methods, and in particular relates to an overhead wire erection method and system considering creep. Background technique [0002] In addition to elastic elongation, creep elongation will also occur in overhead transmission line conductors during tension setting-out and operation due to the multiple effects of tension, temperature and time. The greater the wire tension, the longer the duration, and the higher the temperature, the greater the creep of the wire. The existence of wire creep increases the length of the wire in the span, thereby permanently increasing the arc sag, and as a result, the distance between the wire and the ground and the object to be crossed becomes smaller, endangering the safe operation of the line. Therefore, during the construction of new wire racks, it is necessary to compensate for the creep elongation of the overhead wires during the unwinding process and the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02G1/04
CPCH02G1/04
Inventor 司佳钧刘胜春周立宪朱宽军牛海军孙娜顾建李新民刘臻刘龙孙跃祥郎超
Owner CHINA ELECTRIC POWER RES INST
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