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Method for determining cross section of intelligent element of fire circuit breaker

A determination method and circuit breaker technology, applied in the direction of instruments, calculations, electrical digital data processing, etc., can solve problems such as the inability to quickly determine the cross-sectional area of ​​smart components

Inactive Publication Date: 2015-06-03
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the above problems, the present invention proposes a method for determining the cross-section of the intelligent component of the fire circuit breaker. The Problem of Determining the Sectional Area of ​​Intelligent Components When the Line is Overloaded

Method used

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Embodiment 1

[0053] Known: average resistivity ρ 电阻率 =0.8×10 -6 Ω·m, average specific heat c=545J / kg·℃, average density ρ 密度 =6450kg / m 3 , the peak temperature of transformation from martensite to parent phase △T=80℃ (the peak temperature is equal to one-half of the As+Af phase transition temperature; these data can be obtained from the book "Comprehensive Experiments on Shape Memory Alloys and Analysis and Testing" Checked in Table 1-5).

[0054] Let the rated current I=5 amps (A), power-off time t=2 seconds (s),

[0055] Then s2 =0.24×5 2 ×2×0.8×10 -6 / 545×6450×80=3.4136975×10 -14 (m 2 ) 2

[0056] s=3.4136975 1 / 2 ×10 -7 (m 2 )

[0057] s=1.8476194×10 -7 ×10 6 (mm 2 )=0.18476194(mm 2 )

[0058] Let the radius of the wire be r, then:

[0059] 3.14r 2 =0.18476194

[0060] r 2 =0.0588413

[0061] r=0.2425724 (mm), that is, when the rated current is 5A, the radius r=0.2425724 (mm) of the smart component is sufficient.

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Abstract

The invention discloses a method for determining a cross section of an intelligent element of a fire circuit breaker. The method comprises the following steps of deducing a relation of the mass and a sectional area of the intelligent element according to a density formula; deducing a relation of specific heat and mass of a material used by the intelligent element, a rated current intensity of a circuit and a time parameter for disconnecting the circuit when the overcurrent occurs in the circuit according to the sectional area, heat absorption amount, temperature different and Joule-Lenz's law of a resistor and the intelligent element; calculating a sectional area expression of the intelligent element, establishing a sectional model of the intelligent element of the fire circuit breaker, and determining the sectional area of the intelligent element. According to the method, the condition that the sectional area of the intelligent element depends on the square of the rated current under the situation that the type of the material of the intelligent element is determined can be deduced, i.e. the sectional area of the intelligent element is determined by the square of the rated current, and the required sectional area is larger when the rated current is greater.

Description

technical field [0001] The invention relates to a method for determining the section of an intelligent component of a fire circuit breaker. Background technique [0002] At about 13:00 on January 2, 2015, a fire broke out in a warehouse in the area enclosed by Taigu Street and Nanxun Street in Daowai District, Harbin City, Heilongjiang City for nearly 25 hours. The security guards in the famous building were injured, and more than 2,000 residents in 549 households and some shops facing the street were affected. The burned area was 11,000 square meters, and the collapsed area was 3,000 square meters. In this fire, 152 fire trucks and 642 firefighters participated in the rescue. On January 31, 2015, a fire broke out in the production workshop of Jinhe Board Industry in Genhe City, Inner Mongolia, and burned for nearly 51 hours, killing 6 people and injuring 3 others. On February 5, 2015, another fire broke out in Yiwu shopping mall in Huidong, Guangdong, killing 17 people an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00
Inventor 耿贵立毕见强高学平伦宁张爱敏张芦元
Owner SHANDONG UNIV
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