CN109633334A - A kind of electric heating combines thermal cycling ageing method, apparatus, equipment and storage medium - Google Patents
A kind of electric heating combines thermal cycling ageing method, apparatus, equipment and storage medium Download PDFInfo
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- CN109633334A CN109633334A CN201811640515.2A CN201811640515A CN109633334A CN 109633334 A CN109633334 A CN 109633334A CN 201811640515 A CN201811640515 A CN 201811640515A CN 109633334 A CN109633334 A CN 109633334A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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Abstract
This application discloses a kind of electric heating to combine thermal cycling ageing method, apparatus, equipment and storage medium, and method acquires the essential information of the cable comprising steps of the cable of pending degradation is horizontally arranged；The thermal capacitance data and thermal resistance data that every layer of the cable is calculated according to the essential information establish thermal circuit model, and the thermal capacitance data and thermal resistance data are substituted into the surface temperature that the thermal circuit model calculates the cable；Current value of the cable under preset temperature is calculated according to the surface temperature, the cable is tested under the current value.The application establishes thermal circuit model according to essential information, carries out electric heating test by the electrothermic model of foundation by the essential information of the cable of the pending degradation of acquisition, so that electric heating joint thermal cycling test is easier, test data obtained is relatively reliable.
Description
Technical field
This application involves twisted polyethylene cables, and electric heating to be accelerated to combine accelerated aging test technical field, more particularly to a kind of
Electric heating combines thermal cycling ageing method, apparatus, equipment and storage medium.
Background technique
Power cable is mainly the power transmission being applied in electric system, in occupation of important in the field of power transmission and distribution
Role.The XLPE power cable with cross-linked polyethylene insulation being currently mainly used in the process of running due to for a long time by electricity, heat,
Different degrees of aging can occur under chemistry, the mechanical and multiple stress of environment, and the final result that aging finally results in is
Insulation breakdown, this may result in the power failure of large area, bring weight huge economic loss.So passing through the feature for characterizing aging
Amount seems most important to study the degree of aging of cable insulation material.How aging sample is obtained to power cable ageing research
Very crucial, these samples can reach the cable design service life from natural aging or route is relocated, and the retired cable in midway directly obtains
, but more samples are obtained by manually carrying out accelerated aging test.
Existing electric heating circulating aging testing method tries electric heating circulating using by parallel cable in analog loopback
The applied electric current in circuit is tested as reference frame, because the temperature sensors such as thermocouple can occur in the case where applying high-pressure situations
Irreversible destruction, can only arrangement of the parallel cable as temperature sensor in the analog loopback by applying low-voltage, high-current
Point to parallel cable carry out temperature real-time monitoring, with obtain parallel cable equilibrium temperature with envision temperature it is consistent when cable pass through
Electric current, the cable loop that this method needs two parameters essentially identical, one is used to be punched to monitor each layer temperature.
Cable after punching is unable to satisfy the requirement of real electric heating circulating accelerated aging test, that cable in addition is to subsequent electric heating
Joint accelerated aging test.This traditional analog loopback way undoubtedly causes using and destroying for additional tests cable, also increases
Lossy needs to improve.
Summary of the invention
This application provides a kind of electric heating to combine thermal cycling ageing method, apparatus, equipment and storage medium, can be by adopting
The essential information for collecting the cable of pending degradation establishes thermal circuit model according to essential information, passes through the electrothermic model of foundation
Electric heating test is carried out, so that electric heating joint thermal cycling test is easier, test data obtained is relatively reliable.
A kind of electric heating that the application first aspect provides combines thermal cycling ageing method, comprising:
The cable of pending degradation is horizontally arranged, the essential information of the cable is acquired；
The thermal capacitance data and thermal resistance data that every layer of the cable is calculated according to the essential information, establish thermal circuit model,
And the thermal capacitance data and thermal resistance data are substituted into the surface temperature that the thermal circuit model calculates the cable；
Current value of the cable under preset temperature is calculated according to the surface temperature, to described under the current value
Cable is tested.
Preferably, the essential information specifically includes:
Cross-sectional area and thickness of insulating layer.
Preferably, the cable specifically includes copper conductor layer, insulating layer, wrapping layer, aluminium sheath and oversheath.
Preferably, the thermal capacitance data and thermal resistance data that every layer of the cable is calculated according to the essential information, and root
It is specifically included according to the surface temperature that the thermal capacitance data and thermal resistance data calculate the cable:
Thermal circuit model is established by simulation software, it is every referring to IEC standard to calculate the cable according to the essential information
The thermal capacitance data and the thermal resistance data are substituted into the thermal circuit model by the thermal capacitance data and thermal resistance data of layer, and according to institute
The temperature for stating the conductor layer of cable calculates the surface temperature of corresponding cable.
Preferably, the current value for calculating the cable under preset temperature, to the cable under the current value
Test is carried out to specifically include:
Current value of the cable under preset temperature is calculated, the electric current that the cable generates is controlled by punching transformer
Reach the current value, thermal cycling ageing test is carried out to the cable under the constant current value.
The application second aspect provides a kind of thermal cycling ageing device of electric heating joint, comprising:
It acquires information module and acquires the basic letter of the cable for the cable of pending degradation to be horizontally arranged
Breath；
Computing module, for calculating the thermal capacitance data and thermal resistance data of every layer of the cable according to the essential information,
Thermal circuit model is established, and the thermal capacitance data and thermal resistance data are substituted into the surface temperature that the thermal circuit model calculates the cable
Degree；
Tentative module, for calculating current value of the cable under preset temperature according to the surface temperature, described
The cable is tested under current value.
Preferably, the essential information specifically includes:
Cross-sectional area and thickness of insulating layer.
Preferably, the cable specifically includes copper conductor layer, insulating layer, wrapping layer, aluminium sheath and oversheath.
Preferably, the grouping module is also used to:
It controls concatenated cable and is in same temperature.
A kind of electric heating that the application third aspect provides combines thermal cycling ageing equipment, the equipment include processor and
Memory:
Said program code is transferred to the processor for storing program code by the memory；
The processor is used for old according to the electric heating joint thermal cycle of the instruction execution first aspect in said program code
Change method.
A kind of computer readable storage medium that the application fourth aspect provides, the computer readable storage medium are used for
Program code is stored, said program code combines thermal cycling ageing method for executing electric heating described in first aspect.
As can be seen from the above technical solutions, the application has the following advantages:
A kind of electric heating provided by the present application combines thermal cycling ageing method, apparatus, equipment and storage medium, and method includes step
It is rapid: the cable of pending degradation being horizontally arranged, the essential information of the cable is acquired；It is calculated according to the essential information
The thermal capacitance data and thermal resistance data of every layer of the cable out, establish thermal circuit model, and by the thermal capacitance data and thermal resistance data generation
Enter the surface temperature that the thermal circuit model calculates the cable；The cable is calculated in preset temperature according to the surface temperature
Under current value, the cable is tested under the current value.The electricity that the application passes through the pending degradation of acquisition
The essential information of cable establishes thermal circuit model according to essential information, electric heating test is carried out by the electrothermic model of foundation, so that electric
Heat integration thermal cycling test is easier, and test data obtained is relatively reliable.
Detailed description of the invention
It in ord to more clearly illustrate embodiments of the present application, below will be to required use in embodiment or description of the prior art
Attached drawing be briefly described, it should be apparent that, the drawings in the following description are only some examples of the present application, for this
For the those of ordinary skill of field, without any creative labor, it can also be obtained according to these attached drawings other
Attached drawing.
Fig. 1 is the flow diagram that a kind of electric heating provided by the embodiments of the present application combines thermal cycling ageing method；
Fig. 2 is the cross section signal for the cable that a kind of electric heating provided by the embodiments of the present application combines thermal cycling ageing method
Figure；
Fig. 3 is the equivalent circuit for the thermal circuit model that a kind of electric heating provided by the embodiments of the present application combines thermal cycling ageing method
Figure.
Specific embodiment
This application provides a kind of electric heating to combine thermal cycling ageing method, apparatus, equipment and storage medium, by acquisition to
Carry out degradation cable essential information, thermal circuit model is established according to essential information, by the electrothermic model of foundation come into
The test of row electric heating, so that electric heating joint thermal cycling test is easier, test data obtained is relatively reliable.
To enable present invention purpose, feature, advantage more obvious and understandable, below in conjunction with the application
Attached drawing in embodiment, the technical scheme in the embodiment of the application is clearly and completely described, it is clear that disclosed below
Embodiment be only some embodiments of the present application, and not all embodiment.Based on the embodiment in the application, this field
Those of ordinary skill's all other embodiment obtained without making creative work belongs to the application protection
Range.
Referring to Fig. 1-3, Fig. 1 is the process signal that a kind of electric heating provided by the embodiments of the present application combines thermal cycling ageing method
Figure；Fig. 2 is the cross-sectional view for the cable that a kind of electric heating provided by the embodiments of the present application combines thermal cycling ageing method；Fig. 3
Combine the equivalent circuit diagram of the thermal circuit model of thermal cycling ageing method for a kind of electric heating provided by the embodiments of the present application.
A kind of electric heating that the application first aspect provides combines thermal cycling ageing method, comprising:
The cable of pending degradation is horizontally arranged by S1, acquires the essential information of cable；
S2 calculates the thermal capacitance data and thermal resistance data of every layer of cable according to essential information, establishes thermal circuit model, and will be hot
Hold data and thermal resistance data substitutes into the surface temperature that thermal circuit model calculates cable；
S3 calculates current value of the cable under preset temperature according to surface temperature, tests under current value cable.
It should be noted that a kind of electric heating provided by the embodiments of the present application combines thermal cycling ageing method, wanted by selection
The cable of old heat integration degradation is carried out, and acquires the information such as the section of the cable, cable layers of material and thickness；
It is by road thermal method that cable layering is equivalent at thermal circuit model, and relevant heat transfer spy is obtained by inspection information
Property parameter, is calculated the thermal resistance thermal capacitance of corresponding each layer of cable and the parameter value of heat source；
Obtain the conductor lines that can calculate the cable after the corresponding thermal circuit model of the cable by the surface temperature of the cable
The temperature of core；
The temperature for changing cable conductor core and then the conductor thread core electric current for adjusting the cable, passes through the table of the cable
Face temperature and thermal circuit model are back-calculated to obtain current value corresponding to preset temperature, final to realize to cable electric heating circulating degradation
The control of temperature.
A kind of electric heating provided by the embodiments of the present application combines thermal cycling ageing method, removes original electric heating joint and accelerates always
Change the parallel cable of the analog loopback of test, reduces additional loss while reducing test cable；People is not present in test cable
For destructive breakdown because the application not mounting temperature sensor to cable core position；Thermal circuit model it is accurate
Property for electric heating joint accelerated aging test application so that test result it is more convincing.
Further, essential information specifically includes:
Cross-sectional area and thickness of insulating layer.
Further, cable specifically includes copper conductor layer, insulating layer, wrapping layer, aluminium sheath and oversheath.
Referring to fig. 2, the preferably single-core crosslinked PE cable of cable used by the embodiment of the present application is (unlimited to have used year
Part), it is mainly made of core, insulating layer, interior external shielding layer, wrapping layer, aluminium sheath and outer jacket, and twisted polyethylene cable passes
When power transmission power, cable core conductor, insulating layer etc. produce a large amount of heat energy loss because of reasons such as copper loss, dielectric losses.These heat
Amount is transmitted to its surface with heat exchange pattern outward inside cable conductor.It can referring to the equivalent circuit diagram of the thermal circuit model of Fig. 3
Know, the thermophysical property of every layer of cable can be described by a thermal capacitance and a thermal resistance, and thermal capacitance, thermal resistance reflect that the layer is deposited respectively
Heat accumulation energy, the ability for transmitting heat, wherein thermal capacitance is bigger, and thermal storage capability is stronger；Thermal resistance is bigger, and thermal energy transmission capacity is got over
It is weak.The thermal conductivity of the equal very little of thermal capacitance, thermal resistance of conductor thread core, interior external shielding layer and insulating layer is very approximate and very thin, because of this person
Core layer and shielded layer are often included into insulating layer.Currently, people generally adopt according to parameters such as the structure of cable, material and shape
Every layer of thermal capacitance of cable, thermal resistance are analyzed with IEC standard.Every layer of thermal capacitance of cable, thermal resistance are obtained, we can Fu Shi law and energy
Thermal circuit model is carried out quantitative mathematical description by amount conservation principle etc..
The thermal circuit model obtained by Re Lufa carries out thermometric to the surface of test cable in real time, can pass through the side of derivation
Formula acquires the corresponding current value of temperature of test cable conductor, and the setting for combining the temperature of accelerated aging test for electric heating provides finger
Lead effect.
Further, the thermal capacitance data and thermal resistance data of every layer of cable are calculated according to essential information, and according to thermal capacitance data
The surface temperature for calculating cable with thermal resistance data specifically includes:
Thermal circuit model is established by simulation software, calculates the thermal capacitance of every layer of cable referring to IEC standard according to essential information
Thermal capacitance data and thermal resistance data are substituted into thermal circuit model, and the temperature computation of the conductor layer according to cable by data and thermal resistance data
The surface temperature of corresponding cable out.
It should be noted that IEC standard are as follows: heating 8 hours or more, but two are at least kept within the scope of 90 °~95 °
Hour, then natural cooling 16 hours or more, so circulation 180 times or more.IEC standard, which is laid particular emphasis on, examines the cable long period
Based on the method tested, therefore recommended for cable aging with IEC standard.
Further, current value of the cable under preset temperature is calculated, cable is carried out under current value to test specific packet
It includes:
Current value of the cable under preset temperature is calculated, the electric current that cable generates is controlled by punching transformer and reaches electric current
Value carries out thermal cycling ageing test to cable under constant current value.
The specific implementation step that a kind of electric heating provided by the embodiments of the present application combines thermal cycling ageing method includes:
1, the twisted polyethylene cable for the 110kV voltage class that selection will carry out degradation is stand-by, it is horizontally solid
It is scheduled on laboratory table；
2, using measuring tools such as vernier calipers to the essential information such as cross-sectional area, thickness of insulating layer of the cable of test
Etc. being acquired, and inspection information records core, the thermal conduction characteristic data of the materials such as insulating layer, wherein each layer diameter in detail
For copper conductor 26.6mm, insulating layer 65.6mm, wrapping layer 72mm, aluminium sheath 86mm and oversheath 92mm, the sectional area of conductor is
500mm2；
3, it is modeled using simulation softwares such as Mathlab referring to thermal circuit model, by the data reference recorded in step 2
IEC standard calculates every layer of thermal capacitance of twisted polyethylene cable, the thermal resistance for wanting monitoring temperature, will obtain data and substitutes into thermal circuit model realization
Known any cable surface temperature calculates corresponding conductor temperature or known any cable conductor temperature calculates corresponding cable
Surface temperature；
4, corresponding current value is passed through punching transformation by the temperature for changing conductor by adjusting the electric current of test cable core
Device incudes in test cable to be obtained, and the current value at 90 DEG C of preset temperature is finally determined by the temperature on test cable surface
For 1200A；
5, the power-frequency voltage for applying 1.6U0 by series resonance reactor to 110kV voltage class test cable, by wearing
Heart transformer generates electric current and test cable is made to generate constant 90 DEG C of electric heating joint accelerated aging test.
The embodiment of the present application makees the applied electric current in electric heating circulating test loop with parallel cable in existing analog loopback
For reference, the layout points by parallel cable in the analog loopback of low-voltage, high-current as temperature sensor carry out temperature to it
For method of real-time, only need to essential information cross-sectional area, insulation thickness etc. to the cable of test be acquired, transport
The temperature that test cable surface temperature acquires conductor is just obtained with thermal circuit model Modeling Calculation, the arithmetic speed of computer software is remote
Super practical artificial test operation；Further, after thermal circuit model establishes, this can also be solved using this model later
The problem of type, the convenience and reliability for obtaining experimental data are substantially increased, the method also avoids parallel cable simultaneously
Use and destroy, the investment of test equipments such as temperature sensor and monitor with and reduce operating time of testing crew and put into
(such as eliminating to the operation such as parallel cable punching in analog loopback).
Difference can be wanted in the light of actual conditions or according to the effect reached required for individual by establishing hot road mathematical model
The twisted polyethylene cable of monitoring temperature but unlimited twisted polyethylene cable ageing research is visually operated, by Re Lufa
Theoretical knowledge apply in engineer application, in the embodiment of the present application by thermal circuit model be established as electric heating joint
The application of accelerated aging test made guidance effect so that test it is easier while but also test data
It is relatively reliable.
The application second aspect provides a kind of thermal cycling ageing device of electric heating joint, comprising:
It acquires information module and acquires cable for the cable of pending degradation to be placed horizontally at laboratory table
Essential information；
Computing module establishes hot road for calculating the thermal capacitance data and thermal resistance data of every layer of cable according to essential information
Model, and thermal capacitance data and thermal resistance data are substituted into the surface temperature that thermal circuit model calculates cable；
Tentative module, for calculating current value of the cable under preset temperature according to surface temperature, to electricity under current value
Cable is tested.
Further, essential information specifically includes:
Cross-sectional area and thickness of insulating layer.
Further, cable specifically includes copper conductor layer, insulating layer, wrapping layer, aluminium sheath and oversheath.
Further, grouping module is also used to:
It controls concatenated cable and is in same temperature.
A kind of electric heating that the application third aspect provides combines thermal cycling ageing equipment, and equipment includes processor and storage
Device:
Program code is transferred to processor for storing program code by memory；
Processor is used to combine thermal cycling ageing method according to the electric heating of the instruction execution first aspect in program code.
A kind of computer readable storage medium that the application fourth aspect provides, computer readable storage medium is for storing
Program code, the electric heating that program code is used to execute first aspect combine thermal cycling ageing method.
In several embodiments provided herein, it should be understood that disclosed system, device and method can be with
It realizes by another way.For example, the apparatus embodiments described above are merely exemplary, for example, the division of unit,
Only a kind of logical function partition, there may be another division manner in actual implementation, such as multiple units or components can be with
In conjunction with or be desirably integrated into another system, or some features can be ignored or not executed.Another point, it is shown or discussed
Mutual coupling, direct-coupling or communication connection can be through some interfaces, the INDIRECT COUPLING of device or unit or
Communication connection can be electrical property, mechanical or other forms.
Unit may or may not be physically separated as illustrated by the separation member, shown as a unit
Component may or may not be physical unit, it can and it is in one place, or may be distributed over multiple networks
On unit.It can some or all of the units may be selected to achieve the purpose of the solution of this embodiment according to the actual needs.
It, can also be in addition, each functional unit in each embodiment of the application can integrate in one processing unit
It is that each unit physically exists alone, can also be integrated in one unit with two or more units.Above-mentioned integrated list
Member both can take the form of hardware realization, can also realize in the form of software functional units.
It, can if integrated unit is realized in the form of SFU software functional unit and when sold or used as an independent product
To be stored in a computer readable storage medium.Based on this understanding, the technical solution of the application substantially or
Say that all or part of the part that contributes to existing technology or the technical solution can embody in the form of software products
Out, which is stored in a storage medium, including some instructions are used so that a computer equipment
The all or part of (can be personal computer, server or the network equipment etc.) execution each embodiment method of the application
Step.And storage medium above-mentioned include: USB flash disk, mobile hard disk, read-only memory (full name in English: Read-Only Memory,
English abbreviation: ROM), random access memory (full name in English: Random Access Memory, english abbreviation: RAM), magnetic disk
Or the various media that can store program code such as CD.
The above, above embodiments are only to illustrate the technical solution of the application, rather than its limitations；Although referring to before
Embodiment is stated the application is described in detail, those skilled in the art should understand that: it still can be to preceding
Technical solution documented by each embodiment is stated to modify or equivalent replacement of some of the technical features；And these
It modifies or replaces, the spirit and scope of each embodiment technical solution of the application that it does not separate the essence of the corresponding technical solution.
Claims (10)
1. a kind of electric heating combines thermal cycling ageing method characterized by comprising
The cable of pending degradation is horizontally arranged, the essential information of the cable is acquired；
The thermal capacitance data and thermal resistance data that every layer of the cable is calculated according to the essential information establish thermal circuit model, and will
The thermal capacitance data and thermal resistance data substitute into the surface temperature that the thermal circuit model calculates the cable；
Current value of the cable under preset temperature is calculated according to the surface temperature, to the cable under the current value
It is tested.
2. a kind of electric heating according to claim 1 combines thermal cycling ageing method, which is characterized in that the essential information tool
Body includes:
Cross-sectional area and thickness of insulating layer.
3. a kind of electric heating according to claim 1 combines thermal cycling ageing method, which is characterized in that the cable specifically wraps
Include copper conductor layer, insulating layer, wrapping layer, aluminium sheath and oversheath.
4. a kind of electric heating according to claim 1 combines thermal cycling ageing method, which is characterized in that described according to the base
This information calculates the thermal capacitance data and thermal resistance data of every layer of the cable, and is calculated according to the thermal capacitance data and thermal resistance data
The surface temperature of the cable specifically includes:
Thermal circuit model is established by simulation software, every layer of the cable is calculated referring to IEC standard according to the essential information
The thermal capacitance data and the thermal resistance data are substituted into the thermal circuit model by thermal capacitance data and thermal resistance data, and according to the electricity
The temperature of the conductor layer of cable calculates the surface temperature of corresponding cable.
5. a kind of electric heating according to claim 1 combines thermal cycling ageing method, which is characterized in that described to calculate the electricity
Current value of the cable under preset temperature carries out test to the cable under the current value and specifically includes:
Current value of the cable under preset temperature is calculated, the electric current that the cable generates is controlled by punching transformer and is reached
The current value carries out thermal cycling ageing test to the cable under the constant current value.
6. a kind of electric heating combines thermal cycling ageing device characterized by comprising
It acquires information module and acquires the essential information of the cable for the cable of pending degradation to be horizontally arranged；
Computing module is established for calculating the thermal capacitance data and thermal resistance data of every layer of the cable according to the essential information
Thermal circuit model, and the thermal capacitance data and thermal resistance data are substituted into the surface temperature that the thermal circuit model calculates the cable；
Tentative module, for calculating current value of the cable under preset temperature according to the surface temperature, in the electric current
The cable is tested under value.
7. a kind of electric heating according to claim 6 combines thermal cycling ageing device, which is characterized in that the essential information tool
Body includes:
Cross-sectional area and thickness of insulating layer.
8. a kind of electric heating according to claim 6 combines thermal cycling ageing device, which is characterized in that the cable specifically wraps
Include copper conductor layer, insulating layer, wrapping layer, aluminium sheath and oversheath.
9. a kind of electric heating combines thermal cycling ageing equipment, which is characterized in that the equipment includes processor and memory:
Said program code is transferred to the processor for storing program code by the memory；
The processor is used for according to the described in any item a kind of electric heating of instruction execution claim 1-5 in said program code
Combine thermal cycling ageing method.
10. a kind of computer readable storage medium, which is characterized in that the computer readable storage medium is for storing program generation
Code, said program code require a kind of thermal cycling ageing method of the described in any item electric heating joints of 1-5 for perform claim.
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| CN111666729A (en) * | 2020-07-20 | 2020-09-15 | 南方电网科学研究院有限责任公司 | Thermodynamics-based insulator silicon rubber surface temperature calculation method and related device |
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| CN114325182A (en) * | 2021-12-17 | 2022-04-12 | 西南交通大学 | Evaluation method for thermal-oxidative aging degree of 10kVXLPE cable based on temperature-electricity change rate |
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| CN110095696A (en) * | 2019-06-14 | 2019-08-06 | 广东电网有限责任公司 | A kind of current-carrying capacity of cable method of adjustment, device, equipment and readable storage medium storing program for executing |
| CN111666729A (en) * | 2020-07-20 | 2020-09-15 | 南方电网科学研究院有限责任公司 | Thermodynamics-based insulator silicon rubber surface temperature calculation method and related device |
| CN111666729B (en) * | 2020-07-20 | 2023-05-23 | 南方电网科学研究院有限责任公司 | Insulator silicon rubber surface temperature calculation method based on thermodynamics and related device |
| CN113468841A (en) * | 2021-05-25 | 2021-10-01 | 广东电网有限责任公司广州供电局 | Distribution cable thermal defect detection method and device, computer equipment and storage medium |
| CN114325182A (en) * | 2021-12-17 | 2022-04-12 | 西南交通大学 | Evaluation method for thermal-oxidative aging degree of 10kVXLPE cable based on temperature-electricity change rate |
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