CN110532639A - Cable intermediate joint contact surface calculation of contact resistance method based on magnetic induction intensity - Google Patents
Cable intermediate joint contact surface calculation of contact resistance method based on magnetic induction intensity Download PDFInfo
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- CN110532639A CN110532639A CN201910718661.0A CN201910718661A CN110532639A CN 110532639 A CN110532639 A CN 110532639A CN 201910718661 A CN201910718661 A CN 201910718661A CN 110532639 A CN110532639 A CN 110532639A
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- 238000004364 calculation method Methods 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 32
- 230000006698 induction Effects 0.000 title claims description 39
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 74
- 239000010949 copper Substances 0.000 claims abstract description 74
- 229910052802 copper Inorganic materials 0.000 claims abstract description 74
- 238000002788 crimping Methods 0.000 claims abstract description 64
- 238000001739 density measurement Methods 0.000 claims abstract description 6
- 230000004907 flux Effects 0.000 claims abstract description 6
- 230000007704 transition Effects 0.000 claims description 22
- 239000004020 conductor Substances 0.000 claims description 20
- 238000005259 measurement Methods 0.000 claims description 20
- 238000003032 molecular docking Methods 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 3
- 230000035699 permeability Effects 0.000 claims description 3
- 239000004411 aluminium Substances 0.000 description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 6
- 229910052782 aluminium Inorganic materials 0.000 description 6
- 230000005611 electricity Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 230000032683 aging Effects 0.000 description 2
- 239000012774 insulation material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/08—Measuring resistance by measuring both voltage and current
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
- G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2113/00—Details relating to the application field
- G06F2113/16—Cables, cable trees or wire harnesses
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/30—Assessment of water resources
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Computer Hardware Design (AREA)
- Evolutionary Computation (AREA)
- Geometry (AREA)
- General Engineering & Computer Science (AREA)
- Measurement Of Resistance Or Impedance (AREA)
Abstract
Calculation of contact resistance method of the invention, it chooses the first cable core and the corresponding crimping copper pipe outer surface C point of the second cable core contact surface is magnetic flux density measurement point, measure the all-in resistance Rs of AB sections of cables, construct the equivalent circuit of AB sections of cables, two-dimensional finite element model is established, contact resistance R is finally calculatedj1、Rj2、Rj3.Another calculation of contact resistance method of the invention, first search coil is set at the contact surface of crimping the first cable core of copper pipe inner surface and the second cable core, in crimping copper pipe outer surface, the second search coil is set, apply alternating voltage, the voltage effective value U of record the first search coil output between the end A, the end B1With the voltage effective value U of the second search coil output2；And then contact resistance R is calculatedj1、Rj2、Rj3.Method of the invention can measure, be calculated the contact resistance of each contact surface of cable intermediate joint, convenient for find, analyze cable intermediate joint there are the problem of.
Description
Technical field
The invention belongs to power cable fields, and in particular to the cable intermediate joint based on magnetic induction intensity contacts face contact
Resistance calculations method.
Background technique
The service life of cable depends primarily on the degree of aging of cable insulation material, and the temperature of cable insulation material is
An important factor for influencing its aging speed；Wherein, cable intermediate joint is the region most easily to generate heat in whole cable run again, main
It to be influenced by the contact resistance of cable intermediate joint.Therefore, accurately the contact resistance of measurement cable intermediate joint to effectively commenting
The service life for estimating cable is significant.However, in the calculating or measurement method of current cable intermediate joint contact resistance, only
It is capable of measuring cable intermediate joint overall contact resistance, is unable to measure the contact resistance of each contact surface.Publication No.
The Chinese patent " a method of for calculating three-core cable transition joint aluminium hydraulic pressed connecting pipe contact resistance " of CN104635056B is open
A kind of method for calculating three-core cable transition joint aluminium hydraulic pressed connecting pipe contact resistance, comprising: 1) take length in 10kV three-core cable
Equal two sections are spent, one section includes cable intermediate joint, and one section is cable body；2) using electric drill to the two section of three core electricity taken
Same root core wire is punched in cable, and the position of punching is each section of cable ends；3) using up-flow equipment to 10kV three-core cable
High current is loaded, then takes two sections of cable cores, two sections of voltages, record current and voltage data using ohmmeter measurement；4) root
Two sections of cable core both end voltages are taken according to measurement and by the electric current of cable, calculate aluminium hydraulic pressed connecting pipe and core at cable intermediate joint
Between contact resistance.Obviously, the contact resistance that this method obtains is the overall contact resistance of transition joint.Publication No.
The Chinese patent " a kind of cable intermediate joint aluminium hydraulic pressed connecting pipe at calculation of contact resistance method " of CN107203688A discloses a kind of electricity
Calculation of contact resistance method at cable transition joint aluminium hydraulic pressed connecting pipe, comprising: S1, in conjunction with the regular twisting process of cable core calculates its strand
Close outer diameter D 1；After S2, cable core press, conductor circumscribed circle diameter D2 is calculated；S3, assume each layer conductor deformation quantity after crimping
It is identical, calculate inscribed circle and circumcircle radial difference dc；S4, the effective contact length for calculating compacted stranded conductor cross section outer layer
le；S5, assume that conductor and casing come into full contact with, calculate the real contact area As of transition joint conductor crimping connection；S6, calculating
Contact resistance R between cable core and aluminium hydraulic pressed connecting pipej.Similarly, this method can only measure cable intermediate joint overall contact resistance,
It is unable to measure the contact resistance of each contact surface.
Summary of the invention
Technical problem of the invention is that the measurement of existing cable intermediate joint, calculation method can only measure in cable indirectly
Head overall contact resistance, can not obtain the contact resistance of each contact surface of cable intermediate joint.
Present invention aim to address the above problem, the cable intermediate joint contact face contact based on magnetic induction intensity is provided
Resistance calculations method can measure the contact resistance for obtaining each contact surface of cable intermediate joint, and then find, among analysis cable
Connector there are the problem of, improve cable safety in operation.
The technical scheme is that the cable intermediate joint contact surface calculation of contact resistance method based on magnetic induction intensity,
For measuring, calculating the contact resistance of the AB section cable with transition joint, the first cable core and the second cable core are chosen
The corresponding crimping copper pipe outer surface C point of contact surface is magnetic flux density measurement point, is included the following steps,
Step 1: selecting and the length without transition joint of AB sections of cable same sizes is 1 meter of cable core, measure
To the cable core resistance R of unit length0；
Step 2: the all-in resistance R of AB sections of cables of measurements；
Step 3: the geometric parameter of AB sections of cables of measurement, the diameter d including cable core, the length of the first cable core
L1, the length L of the second cable core2, the diameter D of copper pipe is crimped, the length of copper pipe and the first cable core intersection is crimped
L3, crimp the length L of copper pipe and the second cable core intersection4；
Step 4: according to the rated current virtual value I of AB sections of cablesm, being passed through size to AB sections of cables is ImDC current,
The magnetic induction density B of crimping copper pipe outer surface C point is measured using gaussmeterm；
Step 5: the equivalent circuit of AB sections of cables of building constructs transition joint contact resistance Rj1、Rj2、Rj3With AB sections of cables
All-in resistance RsMathematical relationship, wherein Rj1For the contact resistance for docking contact surface of the first cable core and the second cable core,
Rj2For the contact resistance of the first cable core and the crimping contact surface for crimping copper pipe, Rj3For the second cable core with crimp copper pipe
Crimping contact surface contact resistance；
Step 6: establishing the two-dimensional finite element model of AB sections of cables using finite element software, magnetic induction intensity survey is calculated
Measure the magnetic induction density B of pointj, and the electric current I of the electric current Ix by changing cable core and crimping copper pipem-Ix, so that Bj=Bm；
Step 7: the contact resistance R of cable intermediate joint contact surface is obtained by calculationj1, the first cable core with crimp copper
Contact resistance R at the contact surface of pipej2, the second cable core and the contact resistance R at the contact surface for crimping copper pipej3。
In step 5, the all-in resistance R of AB sections of cabless=R1+Rj1*(Rj2+Rj3)/(Rj1+Rj2+Rj3)+R2,Rj2/Rj3=L3/
L4, the conductor resistance R of the first cable core1=R0*L1, the conductor resistance R of the second cable core2=R0*L2。
In step 6, the two-dimensional finite element model that AB sections of cables are established using finite element software is included the following steps,
Step 1: according to the axial symmetry of AB sections of cables, establishing the two-dimensional finite element model of AB sections of cables, including the first electricity
Cable core, the second cable core, crimping copper pipe, air section；
Step 2: the first cable core, the second cable core, the material properties for crimping copper pipe, the first cable is respectively set
Core, the second cable core, crimping copper pipe, air section relative permeability be set as 1, the first cable core, the second cable
The conductivity of core is set as the conductivity of cable conductor, and the conductivity for crimping copper pipe is set as copper conductivity, the electricity of air section
Conductance is set as 0；
Step 3: the boundary condition of two-dimensional finite element model is set；
Step 3.1: axial symmetry boundary condition is set at the cable axis of two-dimensional finite element model；
Step 3.2: on the boundary that the two-dimensional finite element model boundary setting magnetic induction intensity that magnetic induction intensity is 0 is 0
Condition；
Step 4: the current source that two-dimensional finite element model is arranged is Im, that is, the electric current at the end A, the end B that flow through AB sections of cables is
Im, the first cable core is set as I with the Chong Die zone current of crimping copper pipex, the second cable core with crimping copper pipe it is Chong Die
Zone current be set as Ix, the electric current for crimping copper pipe is set as Im-Ix；
Step 5: enabling Ix=0, starting finite element software calculates the Magnetic Induction Density Distribution of two-dimensional finite element model, record two
Tie up the magnetic induction density B of finite element model C pointj0；
Step 6: enabling Ix=Im, the Magnetic Induction Density Distribution of starting finite element software calculating two-dimensional finite element model, record two
Tie up the magnetic induction density B of finite element model C pointjm；
Step 7: changing IxSize, so that Bj=Bm。
In the two-dimensional finite element model of AB sections of cables, Bj=BmWhen, electric current Ix=Im*(Bm-Bj0)/(Bjm-Bj0)。
It is described that contact resistance R is calculatedj1、Rj2、Rj3,
Contact resistance
Contact resistance
Contact resistance
Cable intermediate joint contact surface calculation of contact resistance method of the another kind based on magnetic induction intensity of the invention, is crimping
First search coil is set at the contact surface of the first cable core of copper pipe inner surface and the second cable core, in crimping copper pipe appearance
The second search coil is arranged in face, and contact surface calculation of contact resistance method includes the following steps,
Step 1: selecting and the length without transition joint of AB sections of cable same sizes is 1 meter of cable core, measure
To the cable core resistance R of unit length0；
Step 2: the geometric parameter of AB sections of cables of measurement, the length L including the first cable core1, the second cable core
Length L2, crimp the length L of copper pipe and the first cable core intersection3, crimp copper pipe and the second cable core intersection
Length L4；
Step 3: the equivalent circuit of AB sections of cables of building constructs transition joint contact resistance Rj1、Rj2、Rj3With AB sections of cables
All-in resistance RsMathematical relationship, wherein Rj1For the contact resistance for docking contact surface of the first cable core and the second cable core,
Rj2For the contact resistance of the first cable core and the crimping contact surface for crimping copper pipe, Rj3For the second cable core with crimp copper pipe
Crimping contact surface contact resistance；
Step 4: applying alternating voltage between end in the end A of AB sections of cables, B, make to form alternating current in AB sections of cables, remember
Record the voltage effective value U of the first search coil output1With the voltage effective value U of the second search coil output2；
Step 5: each contact surface contact resistance R of cable intermediate joint is obtained by calculationj1,Rj2,Rj3。
In step 3, Rs=R1+Rj1*(Rj2+Rj3)/(Rj1+Rj2+Rj3)+R2,Rj2/Rj3=L3/L4；First cable core
Conductor resistance R1=R0*L1, the conductor resistance R of the second cable core2=R0*L2。
In step 5,
Contact resistance
Contact resistance
Contact resistance
Compared with prior art, the beneficial effects of the invention are as follows can measure, each contact surface of cable intermediate joint is calculated
Contact resistance, convenient for find, analyze cable intermediate joint there are the problem of.In addition, choosing connecing for magnetic flux density measurement point
Electric shock resistance calculation method, convenient for understanding the Magnetic Induction Density Distribution situation in cable intermediate joint region；Connecing for search coil is set
Electric shock resistance calculation method is easily operated, and calculation amount is small, convenient to carry out.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples.
Fig. 1 is the structural schematic diagram of the AB section cable with transition joint.
Fig. 2 is the equivalent circuit diagram of the AB section cable with transition joint.
Fig. 3 is the process of the cable intermediate joint contact surface calculation of contact resistance method of the invention based on magnetic induction intensity
Figure；
Fig. 4 is the two-dimensional finite element model of AB sections of cables.
Fig. 5 is the structural schematic diagram that the AB section cable of search coil is arranged.
Fig. 6 is another cable intermediate joint contact surface calculation of contact resistance method based on magnetic induction intensity of the invention
Flow chart.Description of symbols in figure: the first cable core 1；Second cable core 2；Crimp copper pipe 3；First cable core and
The docking contact surface 4 of two cable cores；First cable core and the crimping contact surface 5 for crimping copper pipe；Second cable core and pressure
Connect the crimping contact surface 6 of copper pipe；First search coil 7, the second search coil 8, the air section 9. of two-dimensional finite element model
Specific embodiment
Embodiment one
Fig. 1 show the AB section cable with transition joint, wherein 2 specification phase of the first cable core 1 and the second cable core
Together.
As shown in figure 3, the cable intermediate joint contact surface calculation of contact resistance method based on magnetic induction intensity, for surveying
Amount, the contact resistance for calculating the AB section cable with transition joint choose the docking of the first cable core and the second cable core
The corresponding 3 outer surface C point of crimping copper pipe of contact surface 4 is magnetic flux density measurement point, is included the following steps,
Step 1: selecting and the length without transition joint of AB sections of cable same sizes is 1 meter of cable core, measure
To the cable core resistance R of unit length0；
Step 2: the all-in resistance R of AB sections of cables of measurements；
Step 3: the geometric parameter of AB sections of cables of measurement, the diameter d including cable core, the length of the first cable core 1
L1, the length L of the second cable core 22, the diameter D of copper pipe 3 is crimped, the length of copper pipe 3 and 1 intersection of the first cable core is crimped
Spend L3, crimp the length L of copper pipe 3 and 2 intersection of the second cable core4；
Step 4: according to the rated current virtual value I of AB sections of cablesm, being passed through size to AB sections of cables is ImDC current,
The magnetic induction density B of crimping copper pipe outer surface C point is measured using gaussmeterm；
Step 5: the equivalent circuit of AB sections of cables of building, as shown in Fig. 2, building transition joint contact resistance Rj1、Rj2、Rj3
With AB sections of cable all-in resistance RsMathematical relationship, wherein Rj1Contact surface 4 is docked for the first cable core and the second cable core
Contact resistance, Rj2For the contact resistance of the first cable core and the crimping contact surface 5 for crimping copper pipe, Rj3For the second cable
The contact resistance of core and the crimping contact surface 6 for crimping copper pipe；The all-in resistance R of AB sections of cabless=R1+Rj1*(Rj2+Rj3)/(Rj1+Rj2
+Rj3)+R2,Rj2/Rj3=L3/L4, the conductor resistance R of the first cable core 11=R0*L1, the conductor resistance of the second cable core 2
R2=R0*L2；
Step 6: establishing the two-dimensional finite element model of AB sections of cables using finite element software, magnetic induction intensity survey is calculated
Measure the magnetic induction density B of pointj, and the electric current I of the electric current Ix by changing cable core and crimping copper pipe 3m-Ix, so that Bj=Bm；
Step 7: contact resistance R is obtained by calculationj1、Rj2、Rj3。
In step 6, the two-dimensional finite element model that AB sections of cables are established using finite element software is included the following steps,
Step 1: according to the axial symmetry of AB sections of cables, the two-dimensional finite element model of AB sections of cables is established, as shown in figure 4,
Including the first cable core 1, the second cable core 2, crimping copper pipe 3, air section 9；
Step 2: the first cable core 1, the second cable core 2, the material properties for crimping copper pipe 3, the first electricity is respectively set
Cable core 1, the second cable core 2, crimping copper pipe 3, air section 9 relative permeability be set as 1, the first cable core 1, the
The conductivity of two cable cores 2 is set as the conductivity of cable conductor, and the conductivity of crimping copper pipe 3 is set as copper conductivity, empty
The conductivity in gas region 9 is set as 0；
Step 3: the boundary condition of two-dimensional finite element model is set；
Step 3.1: axial symmetry boundary condition is set at the cable axis of two-dimensional finite element model；
Step 3.2: on the boundary that the two-dimensional finite element model boundary setting magnetic induction intensity that magnetic induction intensity is 0 is 0
Condition；
Step 4: the current source that two-dimensional finite element model is arranged is Im, that is, the electric current at the end A, the end B that flow through AB sections of cables is
Im, the first cable core 1 is set as I with the Chong Die zone current of crimping copper pipe 3x, the second cable core 2 with crimp copper pipe 3
The zone current of overlapping is set as Ix, crimping copper pipe 3 electric current be set as Im-Ix；
Step 5: enabling Ix=0, starting finite element software calculates the Magnetic Induction Density Distribution of two-dimensional finite element model, record two
Tie up the magnetic induction density B of finite element model C pointj0；
Step 6: enabling Ix=Im, the Magnetic Induction Density Distribution of starting finite element software calculating two-dimensional finite element model, record two
Tie up the magnetic induction density B of finite element model C pointjm；
Step 7: changing IxSize, so that Bj=Bm。
Bj=BmWhen, electric current Ix=Im*(Bm-Bj0)/(Bjm-Bj0)；
In step 7,
Contact resistance
Contact resistance
Contact resistance
Embodiment two
Fig. 5 show the AB section cable of setting search coil, and the first cable core 1 is identical with 2 specification of the second cable core,
It crimps 3 the first cable core of inner surface of copper pipe and is provided with the first search coil 7 at contact surface 4 with docking for the second cable core,
Crimping 3 outer surface of copper pipe is provided with the second search coil 8.
As shown in fig. 6, the cable intermediate joint contact surface calculation of contact resistance method based on magnetic induction intensity, including it is following
Step,
Step 1: selecting and the length without transition joint of AB sections of cable same sizes is 1 meter of cable core, measure
To the cable core resistance R of unit length0；
Step 2: the geometric parameter of AB sections of cables of measurement, the length L including the first cable core 11, the second cable core 2
Length L2, crimp the length L of copper pipe 3 and 1 intersection of the first cable core3, crimp copper pipe 3 and be overlapped with the second cable core 2
Partial length L4；
Step 3: the equivalent circuit of AB sections of cables of building, as shown in Fig. 2, building transition joint contact resistance Rj1、Rj2、Rj3
With AB sections of cable all-in resistance RsMathematical relationship, wherein Rj1Contact surface 4 is docked for the first cable core and the second cable core
Contact resistance, Rj2For the contact resistance of the first cable core and the crimping contact surface 5 for crimping copper pipe, Rj3For the second cable
The contact resistance of core and the crimping contact surface 6 for crimping copper pipe；
Step 4: applying alternating voltage between end in the end A of AB sections of cables, B, make to form alternating current in AB sections of cables, remember
Record the voltage effective value U of the first search coil 7 output1With the voltage effective value U of the second search coil 8 output2；
Step 5: each contact surface contact resistance R of cable intermediate joint is obtained by calculationj1,Rj2,Rj3。
In step 3, Rs=R1+Rj1*(Rj2+Rj3)/(Rj1+Rj2+Rj3)+R2,Rj2/Rj3=L3/L4；First cable core 1
Conductor resistance R1=R0*L1, the conductor resistance R of the second cable core 22=R0*L2。
In step 5,
Contact resistance
Contact resistance
Contact resistance
Claims (8)
1. the cable intermediate joint contact surface calculation of contact resistance method based on magnetic induction intensity, in measuring, calculate and having
Between connector AB section cable contact resistance, choose the first cable core and the corresponding crimping copper pipe of the second cable core contact surface
C point in outer surface is magnetic flux density measurement point, which is characterized in that includes the following steps,
Step 1: selecting and the length without transition joint of AB sections of cable same sizes is 1 meter of cable core, measure and obtain list
The cable core resistance R of bit length0；
Step 2: the all-in resistance R of AB sections of cables of measurements；
Step 3: the geometric parameter of AB sections of cables of measurement, the diameter d including cable core, the length L of the first cable core1, second
The length L of cable core2, the diameter D of copper pipe is crimped, the length L of copper pipe and the first cable core intersection is crimped3, crimp copper
The length L of pipe and the second cable core intersection4；
Step 4: according to the rated current virtual value I of AB sections of cablesm, being passed through size to AB sections of cables is ImDC current, use
The magnetic induction density B of gaussmeter measurement crimping copper pipe outer surface C pointm；
Step 5: the equivalent circuit of AB sections of cables of building constructs transition joint contact resistance Rj1、Rj2、Rj3It is always electric with AB sections of cables
Hinder RsMathematical relationship, wherein Rj1For the contact resistance for docking contact surface of the first cable core and the second cable core, Rj2For
The contact resistance of first cable core and the crimping contact surface for crimping copper pipe, Rj3For the second cable core and the crimping for crimping copper pipe
The contact resistance of contact surface；
Step 6: establishing the two-dimensional finite element model of AB sections of cables using finite element software, magnetic flux density measurement point is calculated
Magnetic induction density Bj, and the electric current I of the electric current Ix by changing cable core and crimping copper pipem-Ix, so that Bj=Bm；
Step 7: contact resistance R is obtained by calculationj1、Rj2、Rj3。
2. each contact surface calculation of contact resistance method of the cable intermediate joint according to claim 1 based on magnetic-field measurement,
It is characterized in that, in step 6, the two-dimensional finite element model that AB sections of cables are established using finite element software, including following step
Suddenly,
Step 1: according to the axial symmetry of AB sections of cables, establishing the two-dimensional finite element model of AB sections of cables, including the first cable
Core, the second cable core, crimping copper pipe, air section；
Step 2: be respectively set the first cable core, the second cable core, crimp copper pipe material properties, the first cable core,
Second cable core, crimping copper pipe, air section relative permeability be set as 1, the first cable core, the second cable core
Conductivity is set as the conductivity of cable conductor, and the conductivity for crimping copper pipe is set as copper conductivity, the conductivity of air section
It is set as 0；
Step 3: the boundary condition of two-dimensional finite element model is set；
Step 3.1: axial symmetry boundary condition is set at the cable axis of two-dimensional finite element model；
Step 3.2: the boundary condition for being 0 in the two-dimensional finite element model boundary setting magnetic induction intensity that magnetic induction intensity is 0；
Step 4: the current source that two-dimensional finite element model is arranged is Im, that is, the electric current at the end A, the end B that flow through AB sections of cables is Im, the
The zone current Chong Die with crimping copper pipe of one cable core is set as Ix, the area Chong Die with crimping copper pipe of the second cable core
Domain electric current is set as Ix, the electric current for crimping copper pipe is set as Im-Ix；
Step 5: enabling Ix=0, starting finite element software calculates the Magnetic Induction Density Distribution of two-dimensional finite element model, and record two dimension has
Limit the magnetic induction density B of meta-model C pointj0；
Step 6: enabling Ix=Im, the Magnetic Induction Density Distribution of starting finite element software calculating two-dimensional finite element model, recording two dimension has
Limit the magnetic induction density B of meta-model C pointjm；
Step 7: changing IxSize, so that Bj=Bm。
3. each contact surface calculation of contact resistance method of the cable intermediate joint according to claim 2 based on magnetic-field measurement,
It is characterized in that, the all-in resistance R of AB sections of cabless=R1+Rj1*(Rj2+Rj3)/(Rj1+Rj2+Rj3)+R2,Rj2/Rj3=L3/L4, first
The conductor resistance R of cable core1=R0*L1, the conductor resistance R of the second cable core2=R0*L2。
4. each contact surface calculation of contact resistance method of the cable intermediate joint according to claim 2 based on magnetic-field measurement,
It is characterized in that, in step 7, Bj=BmWhen, electric current Ix=Im*(Bm-Bj0)/(Bjm-Bj0)。
5. each contact surface calculation of contact resistance method of the cable intermediate joint according to claim 3 based on magnetic-field measurement,
It is characterized in that, described be calculated contact resistance Rj1、Rj2、Rj3,
Contact resistance
Contact resistance
Contact resistance
6. the cable intermediate joint contact surface calculation of contact resistance method based on magnetic induction intensity, which is characterized in that in crimping copper
First search coil is set at the contact surface of the first cable core of pipe internal surface and the second cable core, in crimping copper pipe outer surface
Second search coil is set, contact surface calculation of contact resistance method includes the following steps,
Step 1: selecting and the length without transition joint of AB sections of cable same sizes is 1 meter of cable core, measure and obtain list
The cable core resistance R of bit length0；
Step 2: the geometric parameter of AB sections of cables of measurement, the length L including the first cable core1, the length of the second cable core
L2, crimp the length L of copper pipe and the first cable core intersection3, crimp the length of copper pipe and the second cable core intersection
L4；
Step 3: the equivalent circuit of AB sections of cables of building constructs transition joint contact resistance Rj1、Rj2、Rj3It is always electric with AB sections of cables
Hinder RsMathematical relationship, wherein Rj1For the contact resistance for docking contact surface of the first cable core and the second cable core, Rj2For
The contact resistance of first cable core and the crimping contact surface for crimping copper pipe, Rj3For the second cable core and the crimping for crimping copper pipe
The contact resistance of contact surface；
Step 4: apply alternating voltage between end in the end A of AB sections of cables, B, makes to form alternating current in AB sections of cables, record the
The voltage effective value U of one search coil output1With the voltage effective value U of the second search coil output2；
Step 5: each contact surface contact resistance R of cable intermediate joint is obtained by calculationj1、Rj2、Rj3。
7. each contact surface calculation of contact resistance method of the cable intermediate joint according to claim 6 based on magnetic-field measurement,
It is characterized in that, in step 3, Rs=R1+Rj1*(Rj2+Rj3)/(Rj1+Rj2+Rj3)+R2,Rj2/Rj3=L3/L4；First cable core
Conductor resistance R1=R0*L1, the conductor resistance R of the second cable core2=R0*L2。
8. each contact surface calculation of contact resistance method of the cable intermediate joint according to claim 7 based on magnetic-field measurement,
It is characterized in that, in step 5,
Contact resistance
Contact resistance
Contact resistance
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