CN106291263B - A method of examining aluminium cable coupling compression joint technique - Google Patents
A method of examining aluminium cable coupling compression joint technique Download PDFInfo
- Publication number
- CN106291263B CN106291263B CN201610870923.1A CN201610870923A CN106291263B CN 106291263 B CN106291263 B CN 106291263B CN 201610870923 A CN201610870923 A CN 201610870923A CN 106291263 B CN106291263 B CN 106291263B
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- China
- Prior art keywords
- aluminium
- connecting pipe
- temperature
- pressed connecting
- hydraulic pressed
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- 239000004411 aluminium Substances 0.000 title claims abstract description 94
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 94
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 94
- 238000000034 method Methods 0.000 title claims abstract description 58
- 230000006835 compression Effects 0.000 title claims abstract description 35
- 238000007906 compression Methods 0.000 title claims abstract description 35
- 230000008878 coupling Effects 0.000 title claims abstract description 22
- 238000010168 coupling process Methods 0.000 title claims abstract description 22
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 22
- 238000001816 cooling Methods 0.000 claims abstract description 4
- 230000002045 lasting effect Effects 0.000 claims abstract 2
- 238000005259 measurement Methods 0.000 claims description 4
- 230000008859 change Effects 0.000 claims description 3
- 230000008569 process Effects 0.000 claims description 2
- 238000002788 crimping Methods 0.000 description 10
- 239000004020 conductor Substances 0.000 description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 4
- 238000007689 inspection Methods 0.000 description 4
- 230000007812 deficiency Effects 0.000 description 3
- 239000002689 soil Substances 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 241000784732 Lycaena phlaeas Species 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000009123 feedback regulation Effects 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008447 perception Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
-
- 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
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/10—Locating faults in cables, transmission lines, or networks by increasing destruction at fault, e.g. burning-in by using a pulse generator operating a special programme
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/72—Investigating presence of flaws
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Cable Accessories (AREA)
- Connections Effected By Soldering, Adhesion, Or Permanent Deformation (AREA)
Abstract
The invention discloses a kind of methods for examining aluminium cable coupling compression joint technique: (1) aluminium cable connector leads to constant current operation, persistently energization n1 hours, n1 >=8, measure the temperature of aluminium hydraulic pressed connecting pipe, after the temperature of aluminium hydraulic pressed connecting pipe is stablized, utilize the aluminium hydraulic pressed connecting pipe temperature of temperature measurer record at this time, as aluminium hydraulic pressed connecting pipe steady temperature；(2) it powers off, aluminium cable connector natural cooling n2 hours to room temperature n2 >=8；(3) it is multiple that step (1)~(2) are repeated；(4) graph of relation of energization number Yu aluminium hydraulic pressed connecting pipe steady temperature is done, if aluminium hydraulic pressed connecting pipe steady temperature finally tends to a stationary value with the increase of energization number, then it is assumed that aluminium cable coupling compression joint technique is reliable；If the lasting increase with the increase of energization number of adapter tube steady temperature, then it is assumed that aluminium cable coupling compression joint technique is unreliable.The present invention is directed to the creep properties of aluminium, and simple and reliable, cost is relatively low, easy to spread, has great practical value.
Description
Technical field
The present invention relates to the inspection of cable connector compression joint technique, in particular to a kind of inspection aluminium cable coupling compression joint technique
Method.
Background technique
Connection mostly uses crimping mode between state's inner cable at present.Crimping belongs to non-removable connection method, it is with special
Apply pressure with fitting and conductor of the mold to connection, plastic deformation is generated by compression, to make conductor and connection gold utensil phase
A kind of technique of connection.
Under crimping mode, aluminium cable connector is more vulnerable to the influence of the creep properties of aluminium.
The aluminothermy coefficient of expansion is larger, and when the temperature increases, aluminium expansion by very big stress, deforms, when temperature drops
When low, aluminium is shunk again, but is difficult to be restored to original state, forms plastic deformation, this is called the creep properties of aluminium, this is aluminium phase
To the natural disadvantage of copper.
And in aluminium cable actual motion, because daily load curve fluctuation is larger, cable transfer load also becomes within one day
Change it is larger, when electric current is larger joint temperature increase, joint temperature reduces again when electric current is lower.Compared to copper core cable connector,
Because of the creep properties of aluminium, it is more also easy to produce deformation at aluminium cable coupling compression joint fitting and cable core conductor crimping, can not restore former
, there is gap in the state come, i.e., contact resistance is easier to increase at crimping, and contact resistance increase makes to generate heat at crimping when high load capacity
Increase, temperature rises, and is further exacerbated by creep, increases contact resistance at crimping persistently, so that the event of aluminium cable connector
It is bigger than copper core cable to hinder the probability occurred, this is also domestic past aluminium cable operating experience.
Coupling compression joint technique is related with many factors, including shrinking of tool joint or pyrocondensation, aluminium hydraulic pressed connecting pipe material, pressing mold size,
Confining pressure presses and the quality of connector and aluminium hydraulic pressed connecting pipe product.With the progress of compression joint technique, current good compression joint technique can be with
The adverse effect that the creep butt joint of aluminium generates is effectively relieved, conversely, poor compression joint technique will make the deficiency exposure of aluminium conductor
And amplify and come out, lead to the deficiency of Joint Reliability.
For the aluminium cable route that will be put into operation, because its Joint Reliability height be associated with compression joint technique it is very big, for
The creep properties of aluminium, the method for answering reliable design examines the quality of the compression joint technique of proposed adoption, so that it is determined that the reliability of connector
Whether the compression joint technique is used.
Summary of the invention
In order to overcome the disadvantages mentioned above and deficiency of the prior art, the purpose of the present invention is to provide a kind of inspection aluminium cables
The method of coupling compression joint technique, simple and reliable, cost is relatively low, easy to spread.
The purpose of the present invention is achieved through the following technical solutions:
A method of examining aluminium cable coupling compression joint technique, comprising the following steps:
(1) aluminium cable connector leads to constant current operation, and persistently energization n1 hours, n1 >=8 measured the temperature of aluminium hydraulic pressed connecting pipe,
Wherein after the temperature for measuring aluminium hydraulic pressed connecting pipe is stablized, aluminium hydraulic pressed connecting pipe temperature at this time, as aluminium hydraulic pressed connecting pipe steady temperature are recorded；
(2) it powers off, aluminium cable connector natural cooling n2 hours to room temperature, n2 >=8；
(3) it is multiple that step (1)~(2) are repeated；
(4) if aluminium hydraulic pressed connecting pipe steady temperature tends to a stationary value with the increase of energization number, then it is assumed that aluminium cable connector pressure
Connect process；If aluminium hydraulic pressed connecting pipe steady temperature increases with the increase of energization number, then it is assumed that aluminium cable coupling compression joint technique
It is unreliable.
Preferably, the temperature of step (1) the measurement aluminium hydraulic pressed connecting pipe, specifically: pass through temperature measurer and thermocouple measurement, record
The temperature of aluminium hydraulic pressed connecting pipe.
Preferably, the n1=8；The n2=8.
Preferably, step (3) is described repeats step (1)~(2) repeatedly, specifically:
Repeat step (1)~(2) 10~15 times.
Preferably, the size of step (1) described constant current is that the ontology current-carrying capacity based on IEC60287 criterion calculation is big
Small constant current.
Preferably, aluminium hydraulic pressed connecting pipe is observed by doing the graph of relation of energization number Yu aluminium hydraulic pressed connecting pipe steady temperature in step (4)
Steady temperature with energization number increased situation of change.
The principle of the present invention are as follows:
Consider that load variations make aluminium cable joint cold-hot circulation occur, if compression joint technique is unreliable, fitting will be made
Constantly increase with contact resistance at conductor crimping, steady temperature persistently rises at aluminium hydraulic pressed connecting pipe, and reliable compression joint technique can be protected
Hinder contact resistance at crimping to stablize, steady temperature tends to a stationary value at aluminium hydraulic pressed connecting pipe, therefore can be by detecting aluminium hydraulic pressed connecting pipe temperature
The or not of increasing judge the quality of compression joint technique.
Compared with prior art, the present invention has the following advantages and beneficial effects:
Method provided by the invention detects the quality of compression joint technique by thermocycling experiment method, have been directed to aluminium cable
The greatest problem that connector faces, the i.e. creep properties of aluminium can more detect in actual motion aluminium cable connector under load fluctuation
Stability, easy to implement, save the cost and easy to spread.And existing method, such as oscillating wave voltage method and Partial Discharge Detection
Method implements inconvenient and higher cost, and more importantly these methods are mainly used for more common copper core cable, is not directed to and connects
Head place aluminium creep properties, thus the aluminium cable Joint Reliability detected by these methods be easier to partially optimism, and with reality
As a result there is certain deviation.
Detailed description of the invention
Fig. 1 is the schematic diagram of the aluminium cable connector temperature elevation system of the embodiment of the present invention.
Specific embodiment
Below with reference to embodiment, the present invention is described in further detail, embodiments of the present invention are not limited thereto.
Embodiment
A kind of detection method of aluminium cable coupling compression joint technique is examined for the creep properties of aluminium by thermocycling experiment
Survey the quality of compression joint technique.The present embodiment concrete condition are as follows: segment types No. two are all 110kV YJLLW02630mm2Single single
Aluminium cable, compression joint technique are shrinkage type joint, fine aluminium aluminium hydraulic pressed connecting pipe, 630mm2Two sections of cores are crimped on by pressing mold, confining pressure mode
It is formed together connector, just thermocouple is placed between splice insulation layer and aluminium hydraulic pressed connecting pipe during crimping.As shown in Figure 1 by connector both ends
Cable 7 and each experimental provision link together, and two sections of cables of connector and company, institute are laid using soil, buried soil depth 0.6m, soil
15 DEG C of temperature, humidity 54% connect thermocouple and external temperature measurer.
As shown in Figure 1, the aluminium cable connector temperature elevation system that the present embodiment uses includes 380V power supply, pressure regulator 1, PLC
Control panel 2, control station, current lifting device 3, compensating electric capacity case 4, current transformer 5, control motor 6.Computer console mentions
It is convenient for the user to operate for man-machine interface.PLC control cabinet provides the control logic that pressure regulator contact moves up and down, and changes pressure regulator
Self coupling no-load voltage ratio adjusts the electric current for being added in current lifting device end, voltage and transmission power, realizes the control and load of connector electric current.Compensation
Capacitor is connected in parallel on current lifting device input terminal, for compensating the perception of load, increase power factor.Current transformer measuring signal conduct
Control cabinet input signal realizes feedback regulation.
The method of the inspection aluminium cable coupling compression joint technique of the present embodiment, comprising the following steps:
(1) the ontology current-carrying capacity based on IEC60287 criterion calculation is loaded in aluminium cable connector by PLC control cabinet
The constant current of size, size 1300A are persistently powered 8 hours, wherein temperature measurer is shown after the temperature of aluminium hydraulic pressed connecting pipe is stablized
Aluminium hydraulic pressed connecting pipe temperature at this time is 102.5 DEG C, as aluminium hydraulic pressed connecting pipe steady temperature；
(2) it powers off, aluminium cable connector natural cooling 8 hours to room temperature；
(3) step (1)~(2) is repeated 15 times；
(4) graph of relation of energization number Yu aluminium hydraulic pressed connecting pipe steady temperature is done, discovery aluminium hydraulic pressed connecting pipe steady temperature is secondary with being powered
Several increases is finally basically stable at 106.4 DEG C, it is believed that the aluminium cable coupling compression joint technique is reliable.
The above embodiment is a preferred embodiment of the present invention, but embodiments of the present invention are not by the embodiment
Limitation, other any changes, modifications, substitutions, combinations, simplifications made without departing from the spirit and principles of the present invention,
It should be equivalent substitute mode, be included within the scope of the present invention.
Claims (6)
1. a kind of method for examining aluminium cable coupling compression joint technique, which comprises the following steps:
(1) aluminium cable connector leads to constant current operation, and persistently energization n1 hours, n1 >=8 measured the temperature of aluminium hydraulic pressed connecting pipe, wherein
After the temperature of aluminium hydraulic pressed connecting pipe is stablized, aluminium hydraulic pressed connecting pipe temperature at this time, as aluminium hydraulic pressed connecting pipe steady temperature are recorded；
(2) it powers off, aluminium cable connector natural cooling n2 hours to room temperature, n2 >=8；
(3) it is multiple that step (1)~(2) are repeated；
(4) if aluminium hydraulic pressed connecting pipe steady temperature finally tends to a stationary value with the increase of energization number, then it is assumed that aluminium cable connector pressure
Connect process；If the lasting increase with the increase of energization number of aluminium hydraulic pressed connecting pipe steady temperature, then it is assumed that aluminium cable coupling compression joint
Technique is unreliable.
2. the method according to claim 1 for examining aluminium cable coupling compression joint technique, which is characterized in that step (1) institute
The temperature of measurement aluminium hydraulic pressed connecting pipe is stated, specifically: by temperature measurer and thermocouple measurement and record the temperature of aluminium hydraulic pressed connecting pipe.
3. the method according to claim 1 for examining aluminium cable coupling compression joint technique, which is characterized in that the n1=8；
The n2=8.
4. the method according to claim 1 for examining aluminium cable coupling compression joint technique, which is characterized in that step (3) institute
State repetition step (1)~(2) repeatedly, specifically:
Repeat step (1)~(2) 10~15 times.
5. the method according to claim 1 for examining aluminium cable coupling compression joint technique, which is characterized in that step (1) institute
The size for stating constant current is the constant current of the ontology current-carrying capacity size based on IEC60287 criterion calculation.
6. the method according to claim 1 for examining aluminium cable coupling compression joint technique, which is characterized in that in step (4)
By doing the graph of relation of energization number Yu aluminium hydraulic pressed connecting pipe steady temperature, aluminium hydraulic pressed connecting pipe steady temperature is observed with the increase of energization number
Situation of change.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610870923.1A CN106291263B (en) | 2016-09-29 | 2016-09-29 | A method of examining aluminium cable coupling compression joint technique |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610870923.1A CN106291263B (en) | 2016-09-29 | 2016-09-29 | A method of examining aluminium cable coupling compression joint technique |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106291263A CN106291263A (en) | 2017-01-04 |
| CN106291263B true CN106291263B (en) | 2019-08-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610870923.1A Expired - Fee Related CN106291263B (en) | 2016-09-29 | 2016-09-29 | A method of examining aluminium cable coupling compression joint technique |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106997013A (en) * | 2017-05-16 | 2017-08-01 | 中车洛阳机车有限公司 | A kind of temperature rise experimental method of cable crimping point and crimping armor clamp |
| CN110596437B (en) * | 2019-09-29 | 2024-06-11 | 杭州德创电子股份有限公司 | Automatic crimping device for crimping HPLC communication module of electric energy meter |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104678267A (en) * | 2015-02-11 | 2015-06-03 | 华南理工大学 | Method for indirectly measuring dielectric loss of insulation layer of cable |
| CN204855025U (en) * | 2015-07-16 | 2015-12-09 | 河北省电力勘测设计研究院 | Be used for cable intermediate head temperature field measuring temperature measurement testing system |
-
2016
- 2016-09-29 CN CN201610870923.1A patent/CN106291263B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104678267A (en) * | 2015-02-11 | 2015-06-03 | 华南理工大学 | Method for indirectly measuring dielectric loss of insulation layer of cable |
| CN204855025U (en) * | 2015-07-16 | 2015-12-09 | 河北省电力勘测设计研究院 | Be used for cable intermediate head temperature field measuring temperature measurement testing system |
Non-Patent Citations (2)
| Title |
|---|
| 架空线路试验;道客巴巴;《道客巴巴》;20150201;第二节 |
| 线路接头压接工艺标准及压接检测方法探讨;贾巍;《道客巴巴》;20160401;论文一至六节 |
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| CN106291263A (en) | 2017-01-04 |
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Granted publication date: 20190820 |