CN105973745A - Experiment and analysis method of insulation life of power supply cable polymer material - Google Patents
Experiment and analysis method of insulation life of power supply cable polymer material Download PDFInfo
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Abstract
The invention provides an experiment and analysis method of the insulation life of a power supply cable polymer material. The method comprises the following steps: weighing a cable to be measured; determining the failure index of the cable, wherein the failure index is characterized in that the cable is disabled when the weight loss of the cable is 10%; measuring the absolute temperature of the cable to be measured at the failure time in a thermal gravimetric analyzer under different heating rates; and establishing a corresponding function relation expression between the service life t and the service temperature T of the cable under service temperature conditions to obtain the service life t of the cable at the service temperature T, wherein the cable is a polymer insulating material. The experiment method can concretize the life experiment, and allows the service life of the cable at the service temperature to be solved through establishing and analyzing the t and T corresponding function relation. The method is important to correctly assess and predicate the ageing and life problems of lines, avoid initiation of circuit fire hazards and guarantee the national and people's life and property safety.
Description
Technical field
The invention belongs to experiment and the parsing field of insulation life, particularly relate to the experiment of power cable macromolecular material insulation life
Method and parsing.
Background technology
The places such as present family, office, hotel, amusement, workshop, the light used, household electrical appliances, office equipment, production set
The electricity consumption facility such as executing to get more and more, load capacity is the most increasing, and the supply line therefore used is also more and more.For a long time
Since the aging and life problems of supply line because correct assessment cannot be implemented so that can not accurately know which circuit is the most aging,
Service life terminates, it is necessary to the cable more renewed.Otherwise, it is possible to cause puncture short, even detonator circuit fire.Arrive
So far, the fire having occurred many causes cable aging and to cause.So, the experiment of cable aging life-span must be paid much attention to,
This to ensure the country and people the security of the lives and property it is critical that.
At present the prediction and evaluation method of insulant thermal lifetime has two classes: conventional method and rapid evaluation method based on analytic process.
Conventional method application is ripe, but experimental period is long.Rapid evaluation method has been presented for more than 40 year, though still cannot set up theoretically
Information that analytic process is provided and material function lost efficacy between relation, and lack substantial amounts of repeatability and facts have proved.But
It is successfully employed in the life appraisal of some macromolecular materials.
Liu Lihui is in " aging life of cables caused by heat prediction " literary composition, by setting up the functional relationships of aging life of cables caused by heat and current-carrying capacity
System, provides the foundation data for the preventing and treating of current caused hot type cable fire.But owing to it uses DSC as analytical tool, experiment
During macromolecular material occur in that decomposition, the material such as the carbon that thermal decomposition separates out can the detector of severe contamination DSC.On the other hand,
The high temperature of the left and right of the pollutant need 1000 DEG C such as carbon could be purified to be burnt, and DSC can not increase temperature and be burnt, because of institute
Having the maximum operation (service) temperature of real DSC all without more than 700 DEG C, its principle that can exceed that is not the most DSC.So, do
Complete first time test after, after 3 times or 4 times test test data the most inaccurate, just lose use value, therefore DSC be not
Can be used for evaluating the heat stability of macromolecular material, i.e. cannot be used for the prediction of the thermal lifetime of insulant.
Summary of the invention
In order to overcome above-mentioned deficiency, the present invention provides experimental technique and the parsing that a kind of method is simple, calculate simplicity.Experimental technique
Simply, data reliable, it is convenient to resolve.Life experiment can be embodied by the experimental technique using the present invention, by setting up and resolving t
With the respective function relational expression of T, the service life under cable temperature conditions under arms can be obtained.This is to correct assessment and the line of prediction
Aging and the life problems on road, it is to avoid detonator circuit fire, ensure the country and people the security of the lives and property all it is critical that.
Realize rapid evaluation method it is critical only that the contact set up between detection data and the invalid principle of insulant.Existing height
The character of molecule insulant depends primarily on the content of plasticizer and heat stabilizer.Inventor studies discovery: polymer insulation material
Expect that the content of this different component is about at 20% (generally 16%～24%).During heating, they first volatilize or decompose, when they
When weight loss reaches 50%, cable failure.To this end, cable failure target setting is cable weightlessness 10% by inventor.Further
Experimental demonstration shows: " cable failure index refers to that cable weightlessness 10% is inefficacy " of setting and plasticising in insulating polymeric material
Agent reaches 50% with the weight loss of heat stabilizer and is consistent, and therefore, the present invention proposes one simply, accurately based on this discovery
The experiment of power cable macromolecular material insulation life and analytic method.
For achieving the above object, the present invention uses following technical proposals:
The experiment of a kind of power cable macromolecular material insulation life and analytic method, including:
Cable under test is weighed；
Determine that the invalid principle of cable, described invalid principle are: cable weightlessness 10% is inefficacy；
In thermogravimetric analyzer, measure the absolute temperature under different heating rates, when cable under test lost efficacy；
According to pyrolysis kinetics reaction rate equation and Amhenius equation, set up the service life under cable temperature conditions under arms
The respective function relational expression of t and service temperature T, obtains the service life t under the conditions of cable temperature T under arms；
Described cable is insulating polymeric material, and wherein, the total content of plasticizer and heat stabilizer is 16%～24%.
In order to describe conveniently, " power cable " is referred to as " cable " by the present invention.
Preferably, described thermogravimetric analyzer refers to the thermogravimetric analyzer with difference quotient.Evaluate insulant and include the heat of medical drugs
Stability must use thermogravimetric analyzer (TG) or the thermogravimetric analyzer (DTG) with differential, starts on its thermogravimetric curve
Weightlessness occur, i.e. weight starts the temperature alleviated, it is simply that material starts the temperature of thermal decomposition.
Preferably, described different heating rates is at least divided into 3 groups, and each group rate of heat addition becomes arithmetic progression.
It is furthermore preferred that the tolerance of described arithmetic progression is 5 DEG C/min.
Preferably, described " setting up the respective function relational expression of the service life t under cable temperature conditions under arms and service temperature T "
Concrete steps, including:
Decomposition activation energy △ E is tried to achieve according to Doyle-Qzawa method；
General expression according to life time (t) equation is: t=-ln (1-α) e△E/RT/ A, α=w/w in formulaAlways, A=[e△E/RT/(wAlways
-w)]dw/dt；Wherein w is weight loss when weightless 10%；wAlwaysWeight loss during for all having burnt；Dw/dt is and 10%
Time the corresponding difference quotient value of weightlessness point；R is air constant, and equal to 8.314Jmol-1K-1；At A=[e△E/RT/(wAlways-w)]dw/dt
In formula, T is the absolute temperature at weightless 10%；
Try to achieve the respective function relation of t Yu T；Obtain the service life t under the conditions of cable temperature T under arms.
It is furthermore preferred that the solution procedure of described decomposition activation energy △ E is:
Map with experimental data, a straight line of i.e. 1/T being mapped to obtain with lg Φ, solving is to make straight slope be equal to-0.4567 △ E/R,
Thus try to achieve decomposition activation energy △ E.
Present invention also offers experiment and the resolver of a kind of power cable macromolecular material insulation life, including:
Cable weighing device, for weighing the weight of polymer insulation cable to be measured；
Thermogravimetric analyzer, is used for gathering under different heating rates, absolute temperature during polymer insulation cable failure to be measured；Described
Inefficacy refers to: cable weightlessness 10%；
Processor, for each group absolute temperature that will detect and corresponding cable weight, according to pyrolysis kinetics reaction rate side
Journey and Amhenius equation, set up the respective function relation of the service life t under cable temperature conditions under arms and service temperature T
Formula, obtains the service life t under the conditions of cable temperature T under arms；
Described cable is insulating polymeric material, and wherein, the total content of plasticizer and heat stabilizer is 16%～24%.
Preferably, described " setting up the respective function relational expression of the service life t under cable temperature conditions under arms and service temperature T "
Concrete steps, including:
Decomposition activation energy △ E is tried to achieve according to Doyle-Qzawa method；
General expression according to life time (t) equation is: t=-ln (1-α) e△E/RT/ A, α=w/w in formulaAlways, A=[e△E/RT/(wAlways
-w)]dw/dt；Wherein w is weight loss when weightless 10%；wAlwaysWeight loss during for all having burnt；Dw/dt is and 10%
Time the corresponding difference quotient value of weightlessness point；R is air constant, and equal to 8.314Jmol-1K-1；At A=[e△E/RT/(wAlways-w)]dw/dt
In formula, T is the absolute temperature at weightless 10%；
Try to achieve the respective function relation of t Yu T；Obtain the service life t under the conditions of cable temperature T under arms.
It is furthermore preferred that the solution procedure of described decomposition activation energy △ E is:
Map with experimental data, a straight line of i.e. 1/T being mapped to obtain with lg Φ, solving is to make straight slope be equal to-0.4567 △ E/R,
Thus try to achieve decomposition activation energy △ E.
The core value of the present invention is: insulating polymeric material invalid principle is applied to detect the military service of polymer insulation cable
Longevity, by given invalid principle (that is: cable weightlessness 10% is inefficacy), it is achieved that to insulating polymeric material heat ageing equation
Effectively solve.
Present invention also offers experimental technique and the parsing of a kind of preferably power cable macromolecular material insulation life, including following step
Rapid:
The first step, weighs cable macromolecular material；
Second step, puts into thermal analyzer by sample, by setup program Heating Experiment；
3rd step, determines cable failure index；
4th step, the invalid principle determined by the 3rd step intercepts experimental data on thermogravimetric curve；
5th step, maps with experimental data, solves；
6th step, sets up life time equation, and analytical Calculation.
7th step, calculates the life-span under the conditions of cable service temperature.
Weighing described in the described first step, i.e. weighs 5 parts of cable macromolecular materials, and its quality is the most equal, and no more than 10mg.
Sample described in described second step is put into and is referred to point put into for 5 times, and thermal analyzer refers to the thermogravimetric analyzer with difference quotient
(DTG), and respectively press and set 5 DEG C/min of heating schedule, 10 DEG C/min, 15 DEG C/min, 20 DEG C/min, the heating of 25 DEG C/min
Speed Φ carries out Heating Experiment, ends until weightless.
Cable failure index described in described 3rd step refers to that cable weightlessness 10% is inefficacy, or sets according to reality.
The invalid principle determined by the 3rd step described in described 4th step intercepts experimental data on thermogravimetric curve, in weightlessness is i.e.
The local corresponding 5 DEG C/min of 10%, 10 DEG C/min, 15 DEG C/min, 20 DEG C/min, 5 heating curves of 25 DEG C/min cut respectively
Take 5 corresponding absolute temperature T.
Mapping with experimental data described in described 5th step, a straight line of i.e. mapping 1/T to obtain with lg Φ, solving is to make straight line oblique
Rate is equal to-0.4567 △ E/R, thus tries to achieve △ E value.
The general expression of life time (t) equation described in described 6th step is: t=-ln (1-α) e△E/RT/ A, α=w/w in formulaAlways,
A=[eΔE/RT/(wAlways-w)] dw/dt. wherein w is weight loss when weightless 10%；wAlwaysWeight loss during for all having burnt；dw/dt
For the difference quotient value corresponding with weightlessness point when 10%；R is air constant, and equal to 8.314Jmol-1K-1；At A=[eΔE/RT/
(wAlways-w)] in dw/dt formula, T is the absolute temperature at weightless 10%.The concrete of α and A can be obtained by these experimental datas
Numerical value.Again α, A, Δ E, R are substituted into t=-ln (1-α) eΔE/RT/ A, so that it may obtain the respective function relational expression of t Yu T.
The life-span under the conditions of cable service temperature is calculated, even T is (absolute equal to the service temperature of cable described in described 7th step
Temperature), and substitute into the respective function relational expression of t Yu T, so that it may calculate the service life under cable temperature conditions under arms.
Sample identical in quality, respectively with 5 DEG C/min, 10 DEG C/min, 15 DEG C/min, 20 DEG C/min, the heating of 25 DEG C/min
After speed carries out Heating Experiment, 5 thermogravimetric curves can be obtained, be the place of 10% in weightlessness and intercept respectively, 5 can be obtained
Corresponding absolute temperature T.With lg Φ, 1/T is mapped, decomposition activation energy can be tried to achieve by straight slope.Set up and resolve t
With the respective function relational expression of T, then the service temperature (absolute temperature) of cable is substituted into the respective function relational expression of t Yu T,
Just can calculate the service life of cable.
Beneficial effects of the present invention
(1) present invention provides experimental technique and the parsing that a kind of method is simple, calculate simplicity.Experimental technique is simple, data are reliable,
It is convenient to resolve.Life experiment can be embodied by the experimental technique using the present invention, by the respective function set up with resolve t Yu T
Relational expression, can obtain the service life under cable temperature conditions under arms.This aging and life-span to correct assessment with prediction circuit
Problem, it is to avoid detonator circuit fire, ensure the country and people the security of the lives and property all it is critical that.
(2) core value of the present invention is: be applied to insulating polymeric material invalid principle detect polymer insulation cable
It is on active service the longevity, by given invalid principle (that is: cable weightlessness 10% is inefficacy), it is achieved that to insulating polymeric material heat ageing
Effectively solving of equation.
(3) present invention is compared with conventional method, and experimental period is short.Also it is 24 years front former standard (GB/T13464-92 " material heat
The heat analysis method of stability ") revision provide revision foundation.
(4) the analytic method step of the present invention be simple and convenient to operate, practical, it is possible to meet actually used middle cable life
Prediction requirement.
Detailed description of the invention
By the following examples feature of present invention and other correlated characteristic are described in further detail, in order to technology people of the same trade
The understanding of member:
Embodiment 1:
The experimental technique of power cable macromolecular material insulation life and parsing, comprise the following steps:
The first step, weighs cable macromolecular material, and described macromolecular material is crosslinked polyethylene；
Second step, puts into thermal analyzer by sample, by setup program Heating Experiment；
3rd step, determines cable failure index；
4th step, the invalid principle determined by the 3rd step intercepts experimental data on thermogravimetric curve；
5th step, maps with experimental data, solves；
6th step, sets up life time equation, and analytical Calculation.
7th step, calculates the life-span under the conditions of cable service temperature.
Weighing described in the described first step, i.e. weighs 5 parts of cable macromolecular materials, and its quality is equal to 7mg.
Sample described in described second step is put into and is referred to point put into for 5 times, and thermal analyzer refers to the thermogravimetric analyzer with difference quotient
(DTG), and respectively press and set 5 DEG C/min of heating schedule, 10 DEG C/min, 15 DEG C/min, 20 DEG C/min, the heating of 25 DEG C/min
Speed Φ carries out Heating Experiment, ends until weightless.
Cable failure index described in described 3rd step refers to that cable weightlessness 10% is inefficacy, or sets according to reality.
The invalid principle determined by the 3rd step described in described 4th step intercepts experimental data on thermogravimetric curve, in weightlessness is i.e.
The local corresponding 5 DEG C/min of 10%, 10 DEG C/min, 15 DEG C/min, 20 DEG C/min, 5 heating curves of 25 DEG C/min cut respectively
Take 5 corresponding absolute temperature T.
Mapping with experimental data described in described 5th step, a straight line of i.e. mapping 1/T to obtain with lg Φ, solving is to make straight line oblique
Rate is equal to-0.4567 Δ E/R, thus tries to achieve Δ E value.
The general expression of life time (t) equation described in described 6th step is: t=-ln (1-α) eΔE/RT/ A, α=w/w in formulaAlways,
A=[eΔE/RT/(wAlways-w)] dw/dt. wherein w is weight loss when weightless 10%；wAlwaysWeight loss during for all having burnt；dw/dt
For the difference quotient value corresponding with weightlessness point when 10%；R is air constant, and equal to 8.314Jmol-1K-1；At A=[eΔE/RT/
(wAlways-w)] in dw/dt formula, T is the absolute temperature at weightless 10%.The concrete of α and A can be obtained by these experimental datas
Numerical value.Again α, A, Δ E, R are substituted into t=-ln (1-α) eΔE/RT/ A, so that it may obtain the respective function relational expression of t Yu T.
The life-span under the conditions of cable service temperature is calculated, even T is (absolute equal to the service temperature of cable described in described 7th step
Temperature), and substitute into respective function relational expression lgt=-10.865+5391/T of t Yu T.
Embodiment 2:
The experimental technique of power cable macromolecular material insulation life and parsing, comprise the following steps:
The first step, weighs cable macromolecular material, and described macromolecular material is polyimides；
Second step, puts into thermal analyzer by sample, by setup program Heating Experiment；
3rd step, determines cable failure index；
4th step, the invalid principle determined by the 3rd step intercepts experimental data on thermogravimetric curve；
5th step, maps with experimental data, solves；
6th step, sets up life time equation, and analytical Calculation.
7th step, calculates the life-span under the conditions of cable service temperature.
Weighing described in the described first step, i.e. weighs 5 parts of cable macromolecular materials, and its quality is equal to 8mg.
Sample described in described second step is put into and is referred to point put into for 5 times, and thermal analyzer refers to the thermogravimetric analyzer with difference quotient
(DTG), and respectively press and set 5 DEG C/min of heating schedule, 10 DEG C/min, 15 DEG C/min, 20 DEG C/min, the heating of 25 DEG C/min
Speed Φ carries out Heating Experiment, ends until weightless.
Cable failure index described in described 3rd step refers to that cable weightlessness 10% is inefficacy, or sets according to reality.
The invalid principle determined by the 3rd step described in described 4th step intercepts experimental data on thermogravimetric curve, in weightlessness is i.e.
The local corresponding 5 DEG C/min of 10%, 10 DEG C/min, 15 DEG C/min, 20 DEG C/min, 5 heating curves of 25 DEG C/min cut respectively
Take 5 corresponding absolute temperature T.
Mapping with experimental data described in described 5th step, a straight line of i.e. mapping 1/T to obtain with lg Φ, solving is to make straight line oblique
Rate is equal to-0.4567 Δ E/R, thus tries to achieve Δ E value.
The general expression of life time (t) equation described in described 6th step is: t=-ln (1-α) eΔE/RT/ A, α=w/w in formulaAlways,
A=[eΔE/RT/(wAlways-w)] dw/dt. wherein w is weight loss when weightless 10%；wAlwaysWeight loss during for all having burnt；dw/dt
For the difference quotient value corresponding with weightlessness point when 10%；R is air constant, and equal to 8.314Jmol-1K-1；At A=[eΔE/RT/
(wAlways-w)] in dw/dt formula, T is the absolute temperature at weightless 10%.The concrete of α and A can be obtained by these experimental datas
Numerical value.Again α, A, Δ E, R are substituted into t=-ln (1-α) eΔE/RT/ A, so that it may obtain the respective function relational expression of t Yu T.
The life-span under the conditions of cable service temperature is calculated, even T is (absolute equal to the service temperature of cable described in described 7th step
Temperature), and substitute into respective function relational expression lgt=-10.882+5382/T of t Yu T.
Embodiment 3:
The experimental technique of power cable macromolecular material insulation life and parsing, comprise the following steps:
The first step, weighs cable macromolecular material, and described macromolecular material is polrvinyl chloride；
Second step, puts into thermal analyzer by sample, by setup program Heating Experiment；
3rd step, determines cable failure index；
4th step, the invalid principle determined by the 3rd step intercepts experimental data on thermogravimetric curve；
5th step, maps with experimental data, solves；
6th step, sets up life time equation, and analytical Calculation.
7th step, calculates the life-span under the conditions of cable service temperature.
Weighing described in the described first step, i.e. weighs 5 parts of cable macromolecular materials, and its quality is equal to 9mg.
Sample described in described second step is put into and is referred to point put into for 5 times, and thermal analyzer refers to the thermogravimetric analyzer with difference quotient
(DTG), and respectively press and set 5 DEG C/min of heating schedule, 10 DEG C/min, 15 DEG C/min, 20 DEG C/min, the heating of 25 DEG C/min
Speed Φ carries out Heating Experiment, ends until weightless.
Cable failure index described in described 3rd step refers to that cable weightlessness 10% is inefficacy, or sets according to reality.
The invalid principle determined by the 3rd step described in described 4th step intercepts experimental data on thermogravimetric curve, in weightlessness is i.e.
The local corresponding 5 DEG C/min of 10%, 10 DEG C/min, 15 DEG C/min, 20 DEG C/min, 5 heating curves of 25 DEG C/min cut respectively
Take 5 corresponding absolute temperature T.
Mapping with experimental data described in described 5th step, a straight line of i.e. mapping 1/T to obtain with lg Φ, solving is to make straight line oblique
Rate is equal to-0.4567 Δ E/R, thus tries to achieve Δ E value.
The general expression of life time (t) equation described in described 6th step is: t=-ln (1-α) eΔE/RT/ A, α=w/w in formulaAlways,
A=[eΔE/RT/(wAlways-w)] dw/dt. wherein w is weight loss when weightless 10%；wAlwaysWeight loss during for all having burnt；dw/dt
For the difference quotient value corresponding with weightlessness point when 10%；R is air constant, and equal to 8.314Jmol-1K-1；At A=[eΔE/RT/
(wAlways-w)] in dw/dt formula, T is the absolute temperature at weightless 10%.The concrete of α and A can be obtained by these experimental datas
Numerical value.Again α, A, Δ E, R are substituted into t=-ln (1-α) eΔE/RT/ A, so that it may obtain the respective function relational expression of t Yu T.
The life-span under the conditions of cable service temperature is calculated, even T is (absolute equal to the service temperature of cable described in described 7th step
Temperature), and substitute into respective function relational expression lgt=-11.111+5812/T of t Yu T.
Embodiment 4:
The experimental technique of power cable macromolecular material insulation life and parsing, comprise the following steps:
The first step, weighs cable macromolecular material, and described macromolecular material is organic siliconresin；
Second step, puts into thermal analyzer by sample, by setup program Heating Experiment；
3rd step, determines cable failure index；
4th step, the invalid principle determined by the 3rd step intercepts experimental data on thermogravimetric curve；
5th step, maps with experimental data, solves；
6th step, sets up life time equation, and analytical Calculation.
7th step, calculates the life-span under the conditions of cable service temperature.
Weighing described in the described first step, i.e. weighs 5 parts of cable macromolecular materials, and its quality is equal to 10mg.
Sample described in described second step is put into and is referred to point put into for 5 times, and thermal analyzer refers to the thermogravimetric analyzer with difference quotient
(DTG), and respectively press and set 5 DEG C/min of heating schedule, 10 DEG C/min, 15 DEG C/min, 20 DEG C/min, the heating of 25 DEG C/min
Speed Φ carries out Heating Experiment, ends until weightless.
Cable failure index described in described 3rd step refers to that cable weightlessness 10% is inefficacy, or sets according to reality.
The invalid principle determined by the 3rd step described in described 4th step intercepts experimental data on thermogravimetric curve, in weightlessness is i.e.
The local corresponding 5 DEG C/min of 10%, 10 DEG C/min, 15 DEG C/min, 20 DEG C/min, 5 heating curves of 25 DEG C/min cut respectively
Take 5 corresponding absolute temperature T.
Mapping with experimental data described in described 5th step, a straight line of i.e. mapping 1/T to obtain with lg Φ, solving is to make straight line oblique
Rate is equal to-0.4567 Δ E/R, thus tries to achieve Δ E value.
The general expression of life time (t) equation described in described 6th step is: t=-ln (1-α) eΔE/RT/ A, α=w/w in formulaAlways,
A=[eΔE/RT/(wAlways-w)] dw/dt. wherein w is weight loss when weightless 10%；wAlwaysWeight loss during for all having burnt；dw/dt
For the difference quotient value corresponding with weightlessness point when 10%；R is air constant, and equal to 8.314Jmol-1K-1；At A=[eΔE/RT/
(wAlways-w)] in dw/dt formula, T is the absolute temperature at weightless 10%.The concrete of α and A can be obtained by these experimental datas
Numerical value.Again α, A, Δ E, R are substituted into t=-ln (1-α) eΔE/RT/ A, so that it may obtain the respective function relational expression of t Yu T.
The life-span under the conditions of cable service temperature is calculated, even T is (absolute equal to the service temperature of cable described in described 7th step
Temperature), and substitute into respective function relational expression lgt=-10.871+5394/T of t Yu T.
Embodiment 5:
The experimental technique of power cable macromolecular material insulation life and parsing, comprise the following steps:
The first step, weighs cable macromolecular material, and described macromolecular material is natural butadiene-styrene rubber；
Second step, puts into thermal analyzer by sample, by setup program Heating Experiment；
3rd step, determines cable failure index；
4th step, the invalid principle determined by the 3rd step intercepts experimental data on thermogravimetric curve；
5th step, maps with experimental data, solves；
6th step, sets up life time equation, and analytical Calculation.
7th step, calculates the life-span under the conditions of cable service temperature.
Weighing described in the described first step, i.e. weighs 5 parts of cable macromolecular materials, and its quality is equal to 10mg.
Sample described in described second step is put into and is referred to point put into for 5 times, and thermal analyzer refers to the thermogravimetric analyzer with difference quotient
(DTG), and respectively press and set 5 DEG C/min of heating schedule, 10 DEG C/min, 15 DEG C/min, 20 DEG C/min, the heating of 25 DEG C/min
Speed Φ carries out Heating Experiment, ends until weightless.
Cable failure index described in described 3rd step refers to that cable weightlessness 10% is inefficacy, or sets according to reality.
The invalid principle determined by the 3rd step described in described 4th step intercepts experimental data on thermogravimetric curve, in weightlessness is i.e.
The local corresponding 5 DEG C/min of 10%, 10 DEG C/min, 15 DEG C/min, 20 DEG C/min, 5 heating curves of 25 DEG C/min cut respectively
Take 5 corresponding absolute temperature T.
Mapping with experimental data described in described 5th step, a straight line of i.e. mapping 1/T to obtain with lg Φ, solving is to make straight line oblique
Rate is equal to-0.4567 Δ E/R, thus tries to achieve Δ E value.
The general expression of life time (t) equation described in described 6th step is: t=-ln (1-α) eΔE/RT/ A, α=w/w in formulaAlways,
A=[eΔE/RT/(wAlways-w)] dw/dt. wherein w is weight loss when weightless 10%；wAlwaysWeight loss during for all having burnt；dw/dt
For the difference quotient value corresponding with weightlessness point when 10%；R is air constant, and equal to 8.314Jmol-1K-1；At A=[eΔE/RT/
(wAlways-w)] in dw/dt formula, T is the absolute temperature at weightless 10%.The concrete of α and A can be obtained by these experimental datas
Numerical value.Again α, A, Δ E, R are substituted into t=-ln (1-α) eΔE/RT/ A, so that it may obtain the respective function relational expression of t Yu T.
The life-span under the conditions of cable service temperature is calculated, even T is (absolute equal to the service temperature of cable described in described 7th step
Temperature), and substitute into respective function relational expression lgt=-10.671+5344/T of t Yu T.
Finally should be noted that and the foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, to the greatest extent
The present invention has been described in detail by pipe with reference to previous embodiment, and for a person skilled in the art, it still can be right
Technical scheme described in previous embodiment is modified, or wherein part is carried out equivalent.All spirit in the present invention
Within principle, any modification, equivalent substitution and improvement etc. made, should be included within the scope of the present invention.On
Although stating the detailed description of the invention to the present invention to be described, but not limiting the scope of the invention, art skill
Art personnel should be understood that on the basis of technical scheme, and those skilled in the art need not pay creative work i.e.
The various amendments that can make or adjustment are still within protection scope of the present invention.
Claims (10)
1. the experiment of a power cable macromolecular material insulation life and analytic method, it is characterised in that including:
Cable under test is weighed；
Determine that the invalid principle of cable, described invalid principle are: cable weightlessness 10% is inefficacy；
In thermogravimetric analyzer, measure the absolute temperature under different heating rates, when cable under test lost efficacy；
According to pyrolysis kinetics reaction rate equation and Amhenius equation, set up the service life under cable temperature conditions under arms
The respective function relational expression of t and service temperature T, obtains the service life t under the conditions of cable temperature T under arms；
Described cable is insulating polymeric material, and wherein, the total content of plasticizer and heat stabilizer is 16%～24%.
2. the method for claim 1, it is characterised in that described thermogravimetric analyzer refers to the thermogravimetric analyzer with difference quotient.
3. the method for claim 1, it is characterised in that described different heating rates is at least divided into 3 groups, each group heating speed
Rate becomes arithmetic progression.
4. method as claimed in claim 3, it is characterised in that the tolerance of described arithmetic progression is 5 DEG C/min.
5. the method for claim 1, it is characterised in that described " set up the service life under cable temperature conditions under arms
The respective function relational expression of t and service temperature T " concrete steps, including:
Decomposition activation energy Δ E is tried to achieve according to Doyle-Qzawa method；
General expression according to life time (t) equation is: t=-ln (1-α) eΔE/RT/ A, α=w/w in formulaAlways, A=[eΔE/RT/(wAlways
-w)]dw/dt；Wherein w is weight loss when weightless 10%；wAlwaysWeight loss during for all having burnt；Dw/dt is and 10%
Time the corresponding difference quotient value of weightlessness point；R is air constant, and equal to 8.314Jmol-1K-1；At A=[eΔE/RT/(wAlways-w)]dw/dt
In formula, T is the absolute temperature at weightless 10%；
Try to achieve the respective function relation of t Yu T；Obtain the service life t under the conditions of cable temperature T under arms.
6. method as claimed in claim 5, it is characterised in that the solution procedure of described decomposition activation energy Δ E is:
Map with experimental data, a straight line of i.e. 1/T being mapped to obtain with lg Φ, solving is to make straight slope be equal to-0.4567 Δ E/R,
Thus try to achieve decomposition activation energy Δ E.
7. the experiment of a power cable macromolecular material insulation life and resolver, it is characterised in that including:
Cable weighing device, for weighing the weight of polymer insulation cable to be measured；
Thermogravimetric analyzer, is used for gathering under different heating rates, absolute temperature during polymer insulation cable failure to be measured；Described
Inefficacy refers to: cable weightlessness 10%；
Processor, for each group absolute temperature that will detect and corresponding cable weight, according to pyrolysis kinetics reaction rate side
Journey and Amhenius equation, set up the respective function relation of the service life t under cable temperature conditions under arms and service temperature T
Formula, obtains the service life t under the conditions of cable temperature T under arms；
Described cable is insulating polymeric material, and wherein, the total content of plasticizer and heat stabilizer is 16%～24%.
8. device as claimed in claim 7, it is characterised in that described " set up the service life under cable temperature conditions under arms
The respective function relational expression of t and service temperature T " concrete steps, including:
Decomposition activation energy Δ E is tried to achieve according to Doyle-Qzawa method；
General expression according to life time (t) equation is: t=-ln (1-α) eΔE/RT/ A, α=w/w in formulaAlways, A=[eΔE/RT/(wAlways
-w)]dw/dt；Wherein w is weight loss when weightless 10%；wAlwaysWeight loss during for all having burnt；Dw/dt is and 10%
Time the corresponding difference quotient value of weightlessness point；R is air constant, and equal to 8.314Jmol-1K-1；At A=[eΔE/RT/(wAlways-w)]dw/dt
In formula, T is the absolute temperature at weightless 10%；
Try to achieve the respective function relation of t Yu T；Obtain the service life t under the conditions of cable temperature T under arms.
9. device as claimed in claim 8, it is characterised in that the solution procedure of described decomposition activation energy Δ E is:
Map with experimental data, a straight line of i.e. 1/T being mapped to obtain with lg Φ, solving is to make straight slope be equal to-0.4567 Δ E/R,
Thus try to achieve decomposition activation energy Δ E.
10. material failure index is the application in detection polymer insulation cable service life, it is characterised in that described inefficacy refers to
It is designated as described cable weightlessness 10% and is inefficacy.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110487844A (en) * | 2019-06-12 | 2019-11-22 | 广东电网有限责任公司 | A kind of appraisal procedure of power cable insulation layer temperature and failure of insulation |
| CN112763541A (en) * | 2020-12-23 | 2021-05-07 | 上海交通大学 | Thermal life evaluation method of cable insulation material |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102759690A (en) * | 2012-06-25 | 2012-10-31 | 中国电力科学研究院 | Method for judging insulation aging degrees of alternating current (AC) cables |
| CN102967620A (en) * | 2012-12-11 | 2013-03-13 | 常州大学 | Method for evaluating service life of high-molecular material |
| CN104749503A (en) * | 2015-03-30 | 2015-07-01 | 华南理工大学 | XLPE cable insulation aging state determining method |
| WO2015122864A1 (en) * | 2014-02-12 | 2015-08-20 | Aromsa Besi̇n Aroma Ve Katki Maddeleri̇ Sanayi̇ Ve Ti̇caret Anoni̇m Şi̇rketi̇ | Accelerated shelf life calculation method |
-
2016
- 2016-04-29 CN CN201610281211.6A patent/CN105973745A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102759690A (en) * | 2012-06-25 | 2012-10-31 | 中国电力科学研究院 | Method for judging insulation aging degrees of alternating current (AC) cables |
| CN102967620A (en) * | 2012-12-11 | 2013-03-13 | 常州大学 | Method for evaluating service life of high-molecular material |
| WO2015122864A1 (en) * | 2014-02-12 | 2015-08-20 | Aromsa Besi̇n Aroma Ve Katki Maddeleri̇ Sanayi̇ Ve Ti̇caret Anoni̇m Şi̇rketi̇ | Accelerated shelf life calculation method |
| CN104749503A (en) * | 2015-03-30 | 2015-07-01 | 华南理工大学 | XLPE cable insulation aging state determining method |
Non-Patent Citations (1)
| Title |
|---|
| 刘立辉等: ""电缆热老化寿命预测"", 《武警学院学报》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110487844A (en) * | 2019-06-12 | 2019-11-22 | 广东电网有限责任公司 | A kind of appraisal procedure of power cable insulation layer temperature and failure of insulation |
| CN110487844B (en) * | 2019-06-12 | 2020-09-25 | 广东电网有限责任公司 | Method for evaluating temperature and insulation failure of power cable insulation layer |
| CN112763541A (en) * | 2020-12-23 | 2021-05-07 | 上海交通大学 | Thermal life evaluation method of cable insulation material |
| CN112763541B (en) * | 2020-12-23 | 2022-06-14 | 上海交通大学 | Thermal life evaluation method of cable insulation material |
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