CN105912813A - Method for calculating crimping resistance at joint of middle connector of high-voltage single-core cable - Google Patents
Method for calculating crimping resistance at joint of middle connector of high-voltage single-core cable Download PDFInfo
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- CN105912813A CN105912813A CN201610288037.8A CN201610288037A CN105912813A CN 105912813 A CN105912813 A CN 105912813A CN 201610288037 A CN201610288037 A CN 201610288037A CN 105912813 A CN105912813 A CN 105912813A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
- G06Q50/00—Systems or methods specially adapted for specific business sectors, e.g. utilities or tourism
- G06Q50/06—Electricity, gas or water supply
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/70—Smart grids as climate change mitigation technology in the energy generation sector
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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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
Abstract
The invention discloses a method for calculating crimping resistance at the joint of a middle connector of a high-voltage single-core cable. The method comprises the following steps of S1, measuring the size of a connecting pipe by utilizing a measurement tool; S2, determining a crimping length and a crimping force parameter of the joint of the middle connector of the high-voltage single-core cable; S3, calculating total contact resistance of a surface, in contact with a cable core, of the connecting pipe; S4, calculating connecting pipe body resistance of a part, not in contact with the cable core, of the connecting pipe at the joint; and S5, calculating total crimping resistance of the joint. According to the method, the measurement and calculation methods are simple, the conductor loss of the middle connector of the cable can be simply measured, and a detection means is efficient.
Description
Technical field
The present invention relates to crimp resistive technologies field, particularly relate to the crimping of a kind of high voltage single-core cable transition joint junction
The computational methods of resistance.
Background technology
Cable intermediate joint is an important component part of cable run, for realizing continuing and three-phase of cable length
Circuit cross interconnected.Cable run safety work, is heavily dependent on the success or not that cable core connects.Cable
The method of attachment of core has welding and crimping two kinds.Owing to welding technique requires height, the most generally use crimping mode real
The connection of existing cable core.Use crimping mode to connect conductor thread core, change the passage section of head connection point, connecting tube and electricity
The contact resistance (i.e. crimping resistance) of cable core crimp surface is the main cause of cable intermediate joint heating, and crimping resistance is more
Greatly, the current capacity of cable intermediate joint is the lowest.
Cable intermediate joint crimping resistance sizes and connecting tube size, material, processing technology etc. is installed closely related.Actual
Installing in manufacturing process, each producer is mainly by regulation connecting tube size, and load mould number and crimp force scope reduce crimping
The purpose of resistance, lacks effective detection means and computational methods.A kind of cable intermediate joint junction that calculates is found to crimp electricity
The computational methods of the resistance conductor losses to calculating cable intermediate joint further, determines that cable intermediate joint current-carrying capacity has important
Meaning.
Summary of the invention
The technical problem existed based on background technology, the present invention proposes a kind of high voltage single-core cable transition joint junction
The computational methods of crimping resistance.
The computational methods of a kind of high voltage single-core cable transition joint junction crimping resistance that the present invention proposes, including following
Step:
S1, utilizes survey tool to measure connecting tube size；
S2, determines crimping length and the crimp force parameter of high voltage single-core cable transition joint junction；
S3, calculates connecting tube and the total contact resistance of cable core contact surface；
S4, calculate junction connecting tube not with the connecting tube bulk resistance of cable core contact portion；
S5, calculates the crimping resistance that junction is total.
Preferably, in described S1, utilize vernier caliper measurement connecting tube dimensional parameters, measure connecting tube dimensional parameters bag
Include: connecting tube length L1, connecting tube internal diameter d1, connecting tube outside diameter d2, repetitive measurement connecting tube dimensional parameters, conduct of averaging
Final measured value.
Preferably, in described S2, before connecting tube crimping, by vernier caliper measurement exposed length L of the first cable core2With
Exposed length L of core of two cables3；After crimping, with vernier caliper measurement the first cable insulation cut-out point and the second cable insulation
Distance L between cut-out point4, the crimping length L of cable core5Calculate with formula (1),
L5=L4-L2-L3Formula (1)
The crimp force of connecting tube reads from crimping apparatus nameplate, and note crimp force is F.
Preferably, in described S3, contact surface is divided into vertically n section, each segmented current two radially and axially
Direction respectively flows through the contact resistance of single segmentation contact surface and the cable core resistance of single segmentation, obtains the resistance of n segmentation
Network, R in resistor network1Represent the contact resistance in single Minor contact face, use formula (2) to calculate,
In formula (2), R1Representing the contact resistance in single Minor contact face, F represents crimp force, and m is and contact form；
R in resistor network2Represent the cable core resistance of single segmentation, calculate with formula (3),
In formula (3), R2Represent the cable core resistance of single segmentation, ρ1Representing cable core resistivity, l represents connection
Pipe and the total length of cable core contact surface, n represents segmentation number, S1Represent cable core sectional area；
R in resistor network3Represent the connecting tube resistance of single segmentation, calculate with formula (4),
In formula (4), R3Represent the connecting tube resistance of single segmentation, ρ2Represent connecting tube resistivity, l represent connecting tube with
The total length of cable core contact surface, n represents segmentation number, S2Represent the sectional area of connecting tube；
Passive resistance network is carried out abbreviation according to the equivalent transformation principle of star resistor network Yu triangle resistance network,
Obtain from A end to the equivalent resistance of B end, be the contact resistance R that connecting tube is total with cable core contact surfacej,
Preferably, in described S4, junction connecting tube not with the connecting tube bulk resistance R of cable core contact portionbProfit
By the parameter measured by S1 and S2, formula (6) is used to calculate,
In formula (6), ρ2Represent connecting tube resistivity, L5The crimping length of cable core, d1Represent connecting tube internal diameter, d2
Represent connecting tube external diameter.
Preferably, in described S5, the crimping resistance R that high voltage single-core cable transition joint junction is totalyFor connecting tube and electricity
The contact resistance R that cable core contact surface is totalj, junction connecting tube not with the connecting tube bulk resistance R of cable core contact portionb
The series connection of the two, the total crimping resistance in high voltage single-core cable transition joint junction uses formula (7) to calculate,
Ry=Rj+RbFormula (7)
In formula (7), RjCalculate with formula (5), RbCalculate with formula (6).
In the present invention, first measure connecting tube size, further according to erecting bed situation, determine crimping length and the pressure of junction
Relay parameter, and then calculate connecting tube and the total contact resistance of cable core contact surface, high voltage single-core cable transition joint is connected
Place's crimping resistance calculates, and can calculate the conductor losses of cable intermediate joint further, to determining that cable intermediate joint carries
Flow is significant, and measuring method of the present invention is simple, can simply measure the conductor losses of cable intermediate joint, detects hands
Duan Gaoxiao.
Accompanying drawing explanation
Fig. 1 is the height of the computational methods of a kind of high voltage single-core cable transition joint junction crimping resistance that the present invention proposes
Pressure single-core cable transition joint junction schematic diagram；
Fig. 2 is the company of the computational methods of a kind of high voltage single-core cable transition joint junction crimping resistance that the present invention proposes
Adapter and cable core contact surface n grading resistance network diagram.
In figure: 1 first cable, 2 second cables, 3 insulating barriers, 4 cores, 5 connecting tubes.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is explained orally further.
With reference to Fig. 1-2, the calculating side of a kind of high voltage single-core cable transition joint junction crimping resistance that the present invention proposes
Method, is comprising the following steps:
S1, utilizes survey tool to measure connecting tube 5 size；
S2, determines crimping length and the crimp force parameter of high voltage single-core cable transition joint junction；
S3, calculates connecting tube 5 and the cable core 4 total contact resistance of contact surface；
S4, calculate junction connecting tube 5 not with connecting tube 5 bulk resistance of cable core 4 contact portion；
S5, calculates the crimping resistance that junction is total.
The outside of the first cable 1 and the second cable 2 is equipped with insulating barrier 3, is equipped with in the first cable 1 and the second cable 2
Core 4, is provided with connecting tube 5 between the first cable and the second cable, and the core 4 of the first cable 1 and the second cable 2 all extends to
In connecting tube 5.
In described S1, utilize vernier caliper measurement connecting tube dimensional parameters, measure connecting tube dimensional parameters and include: connecting tube
Length L1, connecting tube internal diameter d1, connecting tube outside diameter d2, repetitive measurement connecting tube dimensional parameters, average and measure as final
Value.
In described S2, before connecting tube crimping, by exposed length L of core 4 of vernier caliper measurement the first cable 12With second
Exposed length L of core 4 of cable 23；After crimping, with vernier caliper measurement the first cable 1 insulate cut-out point and the second cable 2 exhausted
Distance L between edge cut-out point4, the crimping length L of cable core 45Calculate with formula (1),
L5=L4-L2-L3Formula (1)
The crimp force of connecting tube reads from crimping apparatus nameplate, and note crimp force is F.
In described S3, contact surface being divided into n section vertically, each segmented current both direction radially and axially is respectively
Flow through the contact resistance of single segmentation contact surface and cable core 4 resistance of single segmentation, obtain the resistor network of n segmentation, electricity
R in resistance network1Represent the contact resistance in single Minor contact face, use formula (2) to calculate,
In formula (2), R1Representing the contact resistance in single Minor contact face, F represents crimp force, and m is and contact form；
R in resistor network2Represent cable core 4 resistance of single segmentation, calculate with formula (3),
In formula (3), R2Represent cable core 4 resistance of single segmentation, ρ1Representing cable core 4 resistivity, l represents even
Adapter 5 and the total length of cable core 4 contact surface, n represents segmentation number, S1Represent cable core 4 sectional area；
R in resistor network3Represent the connecting tube resistance of single segmentation, calculate with formula (4),
In formula (4), R3Represent connecting tube 5 resistance of single segmentation, ρ2Representing connecting tube 5 resistivity, l represents connecting tube 5
With the total length of cable core 4 contact surface, n represents segmentation number, S2Represent the sectional area of connecting tube 5；
Passive resistance network is carried out abbreviation according to the equivalent transformation principle of star resistor network Yu triangle resistance network,
Obtain from A end to the equivalent resistance of B end, be the contact resistance R that connecting tube 5 is total with cable core 4 contact surfacej,
In described S4, junction connecting tube 5 not with the connecting tube 5 bulk resistance R of cable core 4 contact portionbUtilize S1
With the parameter measured by S2, formula (6) is used to calculate,
In formula (6), ρ2Represent connecting tube 5 resistivity, L5The crimping length of cable core 4, d1Represent connecting tube 5 internal diameter,
d2Represent connecting tube 5 external diameter.
In described S5, the crimping resistance R that high voltage single-core cable transition joint junction is totalyFor connecting tube 5 and cable core 4
The contact resistance R that contact surface is totalj, junction connecting tube 5 not with the connecting tube 5 bulk resistance R of cable core 4 contact portionbThe two
Series connection, the total crimping resistance in high voltage single-core cable transition joint junction uses formula (7) to calculate,
Ry=Rj+RbFormula (7)
In formula (7), RjCalculate with formula (5), RbCalculate with formula (6).
The above, the only present invention preferably detailed description of the invention, but protection scope of the present invention is not limited thereto,
Any those familiar with the art in the technical scope that the invention discloses, according to technical scheme and
Inventive concept equivalent or change in addition, all should contain within protection scope of the present invention.
Claims (6)
1. the computational methods of a high voltage single-core cable transition joint junction crimping resistance, it is characterised in that include following step
Rapid:
S1, utilizes survey tool to measure connecting tube size；
S2, determines crimping length and the crimp force parameter of high voltage single-core cable transition joint junction；
S3, calculates connecting tube and the total contact resistance of cable core contact surface；
S4, calculate junction connecting tube not with the connecting tube bulk resistance of cable core contact portion；
S5, calculates the crimping resistance that junction is total.
The computational methods of a kind of high voltage single-core cable transition joint junction the most according to claim 1 crimping resistance, its
It is characterised by, in described S1, utilizes vernier caliper measurement connecting tube dimensional parameters, measure connecting tube dimensional parameters and include: connect
Length of tube L1, connecting tube internal diameter d1, connecting tube outside diameter d2, repetitive measurement connecting tube dimensional parameters, average and measure as final
Value.
The computational methods of a kind of high voltage single-core cable transition joint junction the most according to claim 1 crimping resistance, its
It is characterised by, in described S2, before connecting tube crimping, by vernier caliper measurement exposed length L of the first cable core2With the second cable
Exposed length L of core3；After crimping, with vernier caliper measurement the first cable insulation cut-out point and the second cable insulation cut-out point
Between distance L4, the crimping length L of cable core5Calculate with formula (1),
L5=L4-L2-L3Formula (1)
The crimp force of connecting tube reads from crimping apparatus nameplate, and note crimp force is F.
The computational methods of a kind of high voltage single-core cable transition joint junction the most according to claim 1 crimping resistance, its
Being characterised by, in described S3, contact surface being divided into n section vertically, each segmented current both direction radially and axially is divided
Do not flow through the contact resistance of single segmentation contact surface and the cable core resistance of single segmentation, obtain the resistor network of n segmentation, electricity
In resistance network, R1 represents the contact resistance in single Minor contact face, uses formula (2) to calculate,
In formula (2), R1Representing the contact resistance in single Minor contact face, F represents crimp force, and m is and contact form；
R in resistor network2Represent the cable core resistance of single segmentation, calculate with formula (3),
In formula (3), R2Represent the cable core resistance of single segmentation, ρ1Represent cable core resistivity, l represent connecting tube with
The total length of cable core contact surface, n represents segmentation number, S1Represent cable core sectional area；
R in resistor network3Represent the connecting tube resistance of single segmentation, calculate with formula (4),
In formula (4), R3Represent the connecting tube resistance of single segmentation, ρ2Representing connecting tube resistivity, l represents connecting tube and cable
The total length of core contact surface, n represents segmentation number, S2Represent the sectional area of connecting tube；
Passive resistance network is carried out abbreviation according to the equivalent transformation principle of star resistor network Yu triangle resistance network, obtains
From A end to the equivalent resistance of B end, it is the contact resistance R that connecting tube is total with cable core contact surfacej,
The computational methods of a kind of high voltage single-core cable transition joint junction the most according to claim 1 crimping resistance, its
Be characterised by, in described S4, junction connecting tube not with the connecting tube bulk resistance R of cable core contact portionbUtilize S1 and
Parameter measured by S2, uses formula (6) to calculate,
In formula (6), ρ2Represent connecting tube resistivity, L5The crimping length of cable core, d1Represent connecting tube internal diameter, d2Represent even
Adapter external diameter.
The computational methods of a kind of high voltage single-core cable transition joint junction the most according to claim 1 crimping resistance, its
It is characterised by, in described S5, the crimping resistance R that high voltage single-core cable transition joint junction is totalyFor connecting tube and cable core
The contact resistance R that contact surface is totalj, junction connecting tube not with the connecting tube bulk resistance R of cable core contact portionbThe two
Series connection, the total crimping resistance in high voltage single-core cable transition joint junction uses formula (7) to calculate,
Ry=Rj+RbFormula (7)
In formula (7), RjCalculate with formula (5), RbCalculate with formula (6).
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107194027A (en) * | 2017-04-18 | 2017-09-22 | 华南理工大学 | Aluminium hydraulic pressed connecting pipe Heat Transfer Calculation at a kind of cable intermediate joint |
| CN107203688A (en) * | 2017-04-18 | 2017-09-26 | 华南理工大学 | A kind of calculation of contact resistance method at cable intermediate joint aluminium hydraulic pressed connecting pipe |
| CN110532639A (en) * | 2019-08-05 | 2019-12-03 | 三峡大学 | Cable intermediate joint contact surface calculation of contact resistance method based on magnetic induction intensity |
| CN112098729A (en) * | 2020-09-16 | 2020-12-18 | 国网湖南省电力有限公司 | High-precision crimping impedance detection method based on low-voltage electric energy meter |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101789550A (en) * | 2008-12-16 | 2010-07-28 | 住友电装株式会社 | A wire connection sleeve, a wire connection sleeve producing method, a repair wire and a wire connecting method |
| CN104635056A (en) * | 2015-02-06 | 2015-05-20 | 华南理工大学 | Method for calculating contact resistance of intermediate joint crimping tube of three-core cable |
-
2016
- 2016-05-04 CN CN201610288037.8A patent/CN105912813B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101789550A (en) * | 2008-12-16 | 2010-07-28 | 住友电装株式会社 | A wire connection sleeve, a wire connection sleeve producing method, a repair wire and a wire connecting method |
| CN104635056A (en) * | 2015-02-06 | 2015-05-20 | 华南理工大学 | Method for calculating contact resistance of intermediate joint crimping tube of three-core cable |
Non-Patent Citations (3)
| Title |
|---|
| 刘国建 等: ""基于有限元分析的电缆中间接头电阻研究"", 《电力与能源》 * |
| 许军 等: ""电接触的接触电阻研究"", 《电工材料》 * |
| 陈森昌 等: ""电接触现象和接触电阻模型的研究进展"", 《广东技术师范学院学报（自然科学）》 * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107194027A (en) * | 2017-04-18 | 2017-09-22 | 华南理工大学 | Aluminium hydraulic pressed connecting pipe Heat Transfer Calculation at a kind of cable intermediate joint |
| CN107203688A (en) * | 2017-04-18 | 2017-09-26 | 华南理工大学 | A kind of calculation of contact resistance method at cable intermediate joint aluminium hydraulic pressed connecting pipe |
| CN107194027B (en) * | 2017-04-18 | 2020-05-22 | 华南理工大学 | Heat transfer calculation method for crimping pipe at cable intermediate joint |
| CN110532639A (en) * | 2019-08-05 | 2019-12-03 | 三峡大学 | Cable intermediate joint contact surface calculation of contact resistance method based on magnetic induction intensity |
| CN110532639B (en) * | 2019-08-05 | 2023-06-02 | 三峡大学 | Cable intermediate joint contact surface contact resistance calculation method based on magnetic induction intensity |
| CN112098729A (en) * | 2020-09-16 | 2020-12-18 | 国网湖南省电力有限公司 | High-precision crimping impedance detection method based on low-voltage electric energy meter |
| CN112098729B (en) * | 2020-09-16 | 2022-03-11 | 国网湖南省电力有限公司 | Crimping impedance detection method based on low-voltage electric energy meter |
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