CN103777078B - Cable conductor DC resistance proving installation and method of testing - Google Patents
Cable conductor DC resistance proving installation and method of testing Download PDFInfo
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- CN103777078B CN103777078B CN201210401556.2A CN201210401556A CN103777078B CN 103777078 B CN103777078 B CN 103777078B CN 201210401556 A CN201210401556 A CN 201210401556A CN 103777078 B CN103777078 B CN 103777078B
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Abstract
The invention discloses a kind of cable conductor DC resistance proving installation and method of testing, the connecting line that proving installation comprises double bridge, sample holder and both is electrically connected; Described sample holder comprises with the base of scale, voltage electrode fixture and galvanic electrode fixture; Described voltage electrode fixture and galvanic electrode fixture are slidably fixed on base.Apparatus and method of the present invention adopt raising sample length and layering current input method to carry out the direct current resistance of tested conductor, the impact of contact resistance on test result can be reduced, thus avoid conductor DC resistance test data untrue, improve the accuracy of test.<!--1-->
Description
Technical field
The present invention relates to a kind of cable conductor DC resistance proving installation and adopt this device to carry out the method for testing.
Background technology
What measure the equipment existing market comparative maturity of conductor DC resistance is double bridge, and the jig of employing is generally four-terminal measurement fixture, a pair potential electrode and a pair galvanic electrode, and the distance between potential electrode is fixed as one meter.This measurement mechanism is for being less than 50mm
2following conductor, the error that test exists is very little, substantially negligible, and for test compared with the large gauge conductor particularly large gauge aluminium conductor phenomenons such as often discovery metrical error is large constantly, the large instability of repetitive measurement data fluctuations, test data are untrue.Manufacturing enterprise finds that when producing conductor the cross section of conductor and single line resistivity are all qualified, and after making twisted wire, conductor resistance is often defective.Simultaneously also often find to detect direct current resistance when inspecting by random samples defective for power department and quality supervision department, and cross-sectional area of conductor and single line resistance qualified, thus between all departments because conductor DC resistance problem is often disputed.
Also analyze for this phenomenon those skilled in the art occurred, due to metallic conductor particularly aluminium conductor be very easily oxidized in atmosphere, therefore each aluminium single wire surface all has layer of oxide layer, and the resistivity of this layer of oxide layer is greater than the resistivity of aluminium conductor itself, therefore when tested conductor direct current resistance, there is oxide layer contact resistance, this contact resistance does not exist only between tested sample and bridge gripper, between each single line being simultaneously also present in stranded aluminum conductor, and cross-sectional area of conductor is larger, single line radical is more, total contact resistance between single line is larger.On the other hand, the cross section of conductor is larger, and the resistance of conductor itself is less, and the resistance of 1 meter of conductor is even in the same order of magnitude with contact resistance, and such contact resistance is just large to the relative effect of test resistance.Due to above reason, we adopt conventional method to test large size conductor Problems existing at present: first, the bridge gripper potential electrode of tested conductor resistance is generally fixed as 1 meter in the market, our factory or to detect unit sample censorship be also a meter, and this just have impact on measuring accuracy; Secondly, the bridge gripper purchased in the market is generally the four-terminal measurement fixture of a pair galvanic electrode in electric bridge two outer end, and when measuring due to galvanic electrode only with the outer layer of twisted wire, due to the contact resistance between each single line, cause measuring electric current distribution extremely uneven in each single line of twisted wire, either large or small, so test data is dispersed, undulatory property is larger, the actual value of measured conductor resistance can not be embodied, often there is the phenomenons such as conductor resistance test repeatability is poor, and conductive direct current resistance test is defective.In order to reduce the impact of contact resistance on test, people take various measure, and as adopted nose crimping to conductor termination, carrying out pickling etc. to termination, but effect is not too obvious.
Chinese patent literature CN201210070556.9 disclosed " cable conductor DC resistance proving installation ", this device comprises the end face electric current input fixture that two are located at these proving installation two ends respectively, described end face electric current input fixture comprises the pedestal of a hat shape, described pedestal is provided with clamping device and electric current gatherer, and described electric current gatherer comprises the some electric currents being located at described base bottom and imports terminal.This device adopts end face current input method test cable conductor DC resistance, measuring current is allowed directly to be entered the end face of conductor from end face electric current input fixture by current feed, reduce the contact resistance of conductor and fixture, avoid the false phenomenon of test data of conductor DC resistance to a certain extent.But still there is following defect in this device: 1, current feedthrough device is complicated, is difficult to promote in real operation; 2, electric current introduces conductor termination by many thimbles, and the contact force between each thimble and each single line is difficult to be consistent, and causes the current unevenness flowing through conductor even, tests inaccurate; 3, this device is the improvement of current feedthrough on conventional electric bridge, and its testing length is for fixing 1 meter, and when some conductor needs 3 meters or 5 meters of test aptitude tests are accurate, it cannot realize.
Summary of the invention
First object of the present invention is to provide a kind of measurement mechanism that can improve the accuracy of tested conductor direct current resistance.
The technical scheme realizing the present invention's first object is a kind of cable conductor DC resistance proving installation, the connecting line comprising double bridge, sample holder and both be electrically connected; Described sample holder comprises with the base of scale, voltage electrode fixture and galvanic electrode fixture; Described voltage electrode fixture and galvanic electrode fixture detachably assemble on base, and fix with base sliding.
Described voltage electrode fixture and galvanic electrode fixture are all arranged in pairs at the two ends of base; It is two right that described galvanic electrode fixture is at least, and the galvanic electrode fixture being positioned at base homonymy is connected between two.
The logarithm of described galvanic electrode fixture equals the number of plies of cable under test conductor.
The annular that described each voltage electrode fixture and galvanic electrode fixture are a pair symmetry is filled the span of a man's arms pincers; Described annular is filled the span of a man's arms to clamp and is made up of fixing pincers and adjustable clamp.
Described sample holder also comprises the Support bracket be positioned in the middle part of base.
Second object of the present invention is to provide a kind of measuring method that can improve the accuracy of tested conductor direct current resistance.
The technical scheme realizing the present invention's second object adopts aforesaid cable conductor DC resistance proving installation, tests according to following steps:
Step one: tested sample length as required, intercepts suitable sample, peeled off layer by layer by the conductor of cable two ends and expose each layer conductor, make innermost layer length that conductor stays the longest, length that outermost layer stays is the shortest, and every one deck is all tightened with clip;
Step 2: one end of the galvanic electrode fixture of sample holder one end, voltage electrode fixture and measured conductor is fixed, each galvanic electrode fixture successively with conductor inner, middle and outer layer close contact, voltage electrode fixture and outer single line close contact; According to the voltage electrode fixture of the other end on tested sample length adjustment base and the position of galvanic electrode fixture, then the voltage electrode fixture of the electric bridge other end, galvanic electrode fixture are fixed with the other end of measured conductor respectively, electric bridge two ends are symmetrically fixed.
Step 3: connect double bridge and each voltage electrode fixture and galvanic electrode fixture, method of testing is conveniently tested.
Step 4: read the distance between two voltage electrodes according to base scale, the resistance shown by bridge test is the resistance of this length lower conductor, then according to R=R
x* L obtains the resistance R of every kilometer of conductor.
After have employed technique scheme, the present invention has following positive effect: (1) apparatus and method of the present invention adopt raising sample length and layering current input method to carry out the direct current resistance of tested conductor, namely active type fixture is adopted to lengthen sample holder length, increase measured conductor resistance, pull open the gap of measured resistance and contact resistance, such contact resistance on the impact of conductor test resistance with regard to relative decrease, adopt multipair galvanic electrode simultaneously, each pair of galvanic electrode puts on conductor and exterior layers conductor respectively, make whole aluminium monofilaments of stranded conductor can be connected with the current terminal of measuring system like this, electric current is made to flow through every root monofilament to greatest extent, thus improve the accuracy of direct current resistance test.Therefore can reduce the impact of contact resistance on test result, thus avoid conductor DC resistance test data untrue, improve the accuracy of test.
(2) apparatus and method of the present invention overcome multilayer larger cross-section conductor (particularly aluminium conductor) direct current resistance test time because of contact resistance occur metrical error large, the phenomenons such as test data is untrue, data fluctuations is large, there is good repeatability, the undulatory property of repetitive measurement data is little, test data result embodies real conductor DC resistance numerical value, for the research and development of products of enterprise, materials saving provide the strongest Data safeguard.
(3) apparatus and method of the present invention can be avoided, because providing direct current resistance data and cause manufacturing enterprise's increase cross-sectional area of conductor simply to guarantee that resistance test is qualified accurately, greatly having saved waste of material cost.
(4) utilize apparatus and method of the present invention can provide data accurately, effectively prevent to detect between unit and manufacturing enterprise and dispute.
(5) utilize apparatus and method of the present invention greatly to increase work efficiency, reduce labour intensity.
(6) cable conductor DC resistance proving installation structure of the present invention is simple, potential electrode and galvanic electrode fixture can be regulated arbitrarily according to the length of required test sample, solve the problem that existing direct current resistance test equipment can only survey 1 meter or all the other fixing rice numbers, easy to operate.
Accompanying drawing explanation
In order to make content of the present invention more easily be clearly understood, below according to specific embodiment also by reference to the accompanying drawings, the present invention is further detailed explanation, wherein
Fig. 1 is structural representation of the present utility model.
Fig. 2 is the vertical view of sample holder of the present utility model.
Attached number in the figure is:
Double bridge 1, sample holder 2, base 21, voltage electrode fixture 22, galvanic electrode fixture 23, Support bracket 24, scale 25, connecting line 3, tested sample 4.
Embodiment
(embodiment 1)
See Fig. 1 and Fig. 2, the cable conductor DC resistance proving installation of the present embodiment comprises double bridge 1, sample holder 2 and the connecting line 3 by both's electrical connection.Sample holder 2 comprises with the base 21 of scale 25, voltage electrode fixture 22, galvanic electrode fixture 23, Support bracket 24 and scale 25.Voltage electrode fixture 22 and galvanic electrode fixture 23 detachably assemble on base 21, and slidably fix with base 21, can certainly be one end are fixing, and the other end is the structure of slidably fixing.Voltage electrode fixture 22 and galvanic electrode fixture 23 are all arranged in pairs at the two ends of base 21; It is two right that galvanic electrode fixture 23 is at least, and concrete logarithm equals the number of plies of cable under test conductor, and the galvanic electrode fixture 23 being positioned at base 21 homonymy is connected between two.The annular that each voltage electrode fixture 22 and galvanic electrode fixture 23 are a pair symmetry is filled the span of a man's arms pincers; Annular is filled the span of a man's arms to clamp and is made up of fixing pincers and adjustable clamp, and adjustable clamp can freely be retreated under screw rod, spring, rotary handle effect, and fills the span of a man's arms with fixing pincers are good fit.The end face of each fixture is two semicircles or fan-shaped, with sample close contact after clamping sample.
Testing procedure is as follows:
Step one: tested sample 4 length as required, intercepts suitable sample, peeled off layer by layer by the conductor of cable two ends and expose each layer conductor, make innermost layer length that conductor stays the longest, length that outermost layer stays is the shortest, and every one deck is all tightened with clip;
Step 2: the galvanic electrode fixture 23 of sample holder one end, voltage electrode fixture 22 are fixed with one end of measured conductor, each galvanic electrode 23 jig successively with conductor inner, middle and outer layer close contact, voltage electrode fixture 22 and outer single line close contact; According to the voltage electrode fixture 22 of the other end and the position of galvanic electrode fixture 23 on tested sample 4 length adjustment base 21, then the voltage electrode fixture 22 of the electric bridge other end, galvanic electrode fixture 23 are fixed with the other end of measured conductor respectively, electric bridge two ends are symmetrically fixed.
Step 3: connect double bridge 1 and each voltage electrode fixture 22 and galvanic electrode fixture 23, method of testing is conveniently tested.
Step 4: read the distance between two voltage electrodes according to base scale 25, electric bridge 1 tests the resistance that shown resistance is this length lower conductor, then according to R=R
x* L obtains the resistance R of every kilometer of conductor.
Above-described specific embodiment; object of the present invention, technical scheme and beneficial effect are further described; be understood that; the foregoing is only specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (4)
1. a cable conductor DC resistance proving installation, is characterized in that: the connecting line (3) comprising double bridge (1), sample holder (2) and both be electrically connected; Described sample holder (2) comprises with the base (21) of scale (25), voltage electrode fixture (22) and galvanic electrode fixture (23); Described voltage electrode fixture (22) and galvanic electrode fixture (23) in the upper detachable assembling of base (21), and are fixed with base sliding; Described voltage electrode fixture (22) and galvanic electrode fixture (23) are all arranged in pairs at the two ends of base (21); It is two right that described galvanic electrode fixture (23) is at least, and the galvanic electrode fixture (23) being positioned at base (21) homonymy is connected between two.
2. cable conductor DC resistance proving installation according to claim 1, is characterized in that: the logarithm of described galvanic electrode fixture (23) equals the number of plies of cable under test conductor.
3. cable conductor DC resistance proving installation according to claim 2, is characterized in that: the annular that each described voltage electrode fixture (22) and galvanic electrode fixture (23) are a pair symmetry is filled the span of a man's arms pincers; Described annular is filled the span of a man's arms to clamp and is made up of fixing pincers and adjustable clamp.
4. the cable conductor DC resistance proving installation according to Claims 2 or 3, is characterized in that: described sample holder (2) also comprises the Support bracket (24) being positioned at base (21) middle part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201210401556.2A CN103777078B (en) | 2012-10-19 | 2012-10-19 | Cable conductor DC resistance proving installation and method of testing |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210401556.2A CN103777078B (en) | 2012-10-19 | 2012-10-19 | Cable conductor DC resistance proving installation and method of testing |
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| CN103777078A CN103777078A (en) | 2014-05-07 |
| CN103777078B true CN103777078B (en) | 2016-04-27 |
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| CN201210401556.2A Active CN103777078B (en) | 2012-10-19 | 2012-10-19 | Cable conductor DC resistance proving installation and method of testing |
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| CN105486891A (en) * | 2014-09-18 | 2016-04-13 | 国家电网公司 | Bridge clamp |
| CN104865447B (en) * | 2015-05-11 | 2017-10-03 | 中铁建电气化局集团康远新材料有限公司 | Monofilament direct current resistance m easurem ent device and method after one kind is twisted |
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| CN109470926B (en) * | 2018-03-02 | 2020-10-16 | 国网浙江省电力公司嘉兴供电公司 | Cable direct current resistance measuring device and application method thereof |
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| CN111239443A (en) * | 2020-02-24 | 2020-06-05 | 国网天津市电力公司电力科学研究院 | Clamp for detecting direct current resistance of distribution network cable |
| CN111308210B (en) * | 2020-04-16 | 2024-05-14 | 国网山西省电力公司电力科学研究院 | Device and method for rapidly and accurately testing direct-current resistance of lead |
| CN112067895B (en) * | 2020-08-25 | 2024-06-25 | 中国电力科学研究院有限公司 | Cable conductor direct current resistance testing arrangement |
| CN114113793A (en) * | 2020-08-27 | 2022-03-01 | 国网陕西省电力公司电力科学研究院 | Device and method for measuring resistivity of flat-strip copper-clad steel |
| CN112578185A (en) * | 2020-11-13 | 2021-03-30 | 国网江苏省电力有限公司电力科学研究院 | Device and method for testing direct current resistance of conductor bearing electromagnetic coupling induced potential |
| CN113311244A (en) * | 2021-07-02 | 2021-08-27 | 上海国缆检测股份有限公司 | Conductor direct current resistance testing method |
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Address after: No. 8, Gaocheng Town, Yixing city of Jiangsu Province, Wuxi City, the Far East Avenue 214257 Applicant after: Far East Cable Co., Ltd. Applicant after: NEW FAR EAST CABLE CO., LTD. Applicant after: Yuandong Compound Techn Co., Ltd. Address before: No. 8, Gaocheng Town, Yixing city of Jiangsu Province, Wuxi City, the Far East Avenue 214257 Applicant before: Far East Cable Co., Ltd. Applicant before: New Far East Cable Co., Ltd. Applicant before: Yuandong Compound Techn Co., Ltd. |
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