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Method for evaluating bearing capacity of overhead steel-cored aluminum stranded wire after mountain fire fumigation

A steel-cored aluminum stranded wire, bearing capacity technology, applied in the direction of tension measurement, special data processing applications, instruments, etc., can solve problems such as potential safety hazards in power transmission

Active Publication Date: 2019-08-23
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The burn degree that characterizes the fire is mainly reflected in the temperature of the wildfire. After different fires, the tension (sag becomes larger), tensile strength, and electrical conductivity of the wire may be affected to a certain extent, especially the strength of the line. If it is significantly reduced, it will Poses a major risk to power transmission safety

Method used

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  • Method for evaluating bearing capacity of overhead steel-cored aluminum stranded wire after mountain fire fumigation
  • Method for evaluating bearing capacity of overhead steel-cored aluminum stranded wire after mountain fire fumigation
  • Method for evaluating bearing capacity of overhead steel-cored aluminum stranded wire after mountain fire fumigation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0117] (1) Assume that an overhead conductor whose model is JL / G1A-400 / 50 is roasted by a mountain fire at 200°C, and one conductor with serious burns breaks 2 aluminum wires on the first layer, and 1 aluminum wire on the second layer. root, 3rd layer aluminum wire and steel core intact. Purchase the signal wire and fill in the number of effective experimental monofilament wires in each layer according to the site as shown in Table 3. Then carry out the resistance furnace baking test, the test temperature is 300 ℃, and the time is 30 minutes. Finally, the tensile force test of the aluminum layer and the steel core is carried out separately by using a universal material testing machine, and the parameters of the tensile force of each layer of monofilament conductor can be obtained. Finally, the comprehensive breaking force T is calculated b :

[0118] Table 3 The overhead wires of JL / G1A-400 / 50 are roasted in a resistance furnace at 300°C

[0119]

[0120] (2) Consult th...

Embodiment 2

[0126] (1) Assume that an overhead conductor whose model is JL / G1A-500 / 45 is roasted by a mountain fire at 400°C, and one conductor with serious burns breaks 4 aluminum wires on the first layer, and 2 aluminum wires on the second layer. 1 root, and 1 aluminum wire on the third layer was broken. The steel core is not broken. Purchase the signal wire and fill in the number of effective experimental monofilament wires in each layer according to the site as shown in Table 5. Then carry out the resistance furnace baking test, the test temperature is 300 ℃, and the time is 30 minutes. Finally, the tensile force test of the aluminum layer and the steel core is carried out separately by using a universal material testing machine, and the parameters of the tensile force of each layer of monofilament conductor can be obtained. Finally, the comprehensive breaking force T is calculated b :

[0127] Table 5 The overhead wire of JL / G1A-500 / 45 is roasted in a resistance furnace at 400°C ...

Embodiment 3

[0135] (1) Assume that an overhead conductor whose model is JL / G1A-800 / 70 is roasted by a mountain fire at 550°C, and one conductor with serious burns breaks 8 aluminum wires on the first layer and 5 aluminum wires on the second layer. Three aluminum wires on the third layer were broken, two steel cores on the first layer were broken, and the steel core on the second layer was intact. Purchase the signal wire and fill in the number of effective experimental monofilament wires in each layer according to the site as shown in Table 7. Then carry out the resistance furnace baking test, the test temperature is 550 ℃, and the time is 30 minutes. Finally, the tensile force test of the aluminum layer and the steel core is carried out separately by using a universal material testing machine, and the parameters of the tensile force of each layer of monofilament conductor can be obtained. Finally, the comprehensive breaking force T is calculatedb :

[0136] Table 7 The overhead wires o...

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Abstract

The invention discloses a method for evaluating the bearing capacity of an overhead steel-cored aluminum stranded wire after mountain fire fumigation, which comprises the following steps of: firstly,carrying out layered monofilament aluminum wire and steel core breaking force tests on an overhead conductor with an evaluated model at different temperatures to obtain a series of parameters of an experimental breaking force Tb of the overhead conductor; secondly, measuring required parameters on site, and calculating the maximum allowable tension T; and judging whether the steel-cored aluminum stranded wire can continue to bear the operation condition or not by comparing the theoretical maximum allowable tension T with the simulation experiment tensile strength Tb. According to the method, on-site wire dismounting is avoided, the bearing capacity can be simply and rapidly evaluated, and therefore cost is saved or reference is provided for a wire replacement maintenance department.

Description

technical field [0001] The invention relates to a method for evaluating the bearing capacity of an overhead steel-cored aluminum stranded wire after a mountain fire is smoked. Background technique [0002] my country is a mountainous country, and overhead transmission lines inevitably pass through forested areas with dense vegetation, so high-voltage wires are inevitably endangered by wildfires and cause tripping accidents. At home and abroad, there are few analyzes on the influence characteristics and laws of high-voltage conductor mechanical properties and carrying capacity after wildfires, and the operation and control of transmission lines under wildfire conditions are also lack of pertinence, which makes wildfire accidents have great impact on transmission lines and power grids. had a major impact on the security and stability of the Mountain fires cause different degrees of burns to wires depending on the size of the fire in the environment. Some areas are not severel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50G01L5/06
CPCG01L5/06G06F30/20Y02P90/30
Inventor 陈维毅武晓刚唐震王欣伟刘佳琼杨今朝
Owner TAIYUAN UNIV OF TECH
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