CN109470926B - Cable direct current resistance measuring device and application method thereof - Google Patents
Cable direct current resistance measuring device and application method thereof Download PDFInfo
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- CN109470926B CN109470926B CN201810176199.1A CN201810176199A CN109470926B CN 109470926 B CN109470926 B CN 109470926B CN 201810176199 A CN201810176199 A CN 201810176199A CN 109470926 B CN109470926 B CN 109470926B
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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
- 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
- G01R27/16—Measuring impedance of element or network through which a current is passing from another source, e.g. cable, power line
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
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Abstract
The invention discloses a cable direct current resistance measuring device capable of accurately measuring the resistance of a cable conductor with each sectional area and ensuring good contact of a potential connector and an application method thereof, wherein the cable direct current resistance measuring device comprises a base; the current crimping modules are arranged at two ends of the measuring device and comprise current connectors and conductive connectors, and the current crimping modules are connected with the base in a sliding mode; and two potential press-cutting modules arranged between the current crimping modules, wherein each potential press-cutting module comprises an upper potential press-cutting module and a lower potential press-cutting module, each upper potential press-cutting module comprises an upper potential press-cutting module potential connector, each lower potential press-cutting module comprises a lower potential press-cutting module potential connector, each upper potential press-cutting module can move relative to each lower potential press-cutting module, each upper potential press-cutting module and each lower potential press-cutting module are respectively connected with a blade, and the blades are respectively and electrically connected with the upper potential press-cutting module potential connectors and the lower potential press-cutting module potential connectors.
Description
Technical Field
The invention relates to the technical field of cable direct current resistance measurement, in particular to a cable direct current resistance measurement device and an application method thereof.
Background
In order to check whether the sectional area of the conductor is consistent with the specification of a manufacturing factory, whether the conductivity of the cable is qualified, whether the conductor is broken and stranded and the like, the direct current resistance of the cable needs to be measured. The direct current resistance of the conductor of the wire and cable is an important performance index of the wire and cable, and a double-arm direct current bridge is mostly adopted for testing at present.
For example, prior art 1 (CN 102608428A) discloses a cable conductor dc resistance testing apparatus, which includes two end-face current input clamps respectively disposed at two ends of the testing apparatus, where the end-face current input clamps include a cap-shaped base, a clamping device and a current lead-in device are disposed on the base, and the current lead-in device includes a plurality of current lead-in terminals disposed at the bottom of the base.
This application has the following disadvantages: first, gb/t 3048.4-2007 electric properties test methods for wires and cables part 4: conductor direct current resistance test 3.4 provisions: for a four-terminal measurement fixture, the spacing between each potential contact and the corresponding current contact should be no less than 1.5 times the perimeter of the specimen cross-section. However, the potential electrode and the current electrode of the bridge clamp provided by the application are connected into a whole by using an insulating material and fixed on the base, and the distance between the potential electrode and the current electrode cannot be adjusted to meet the requirement of measuring samples with different sections. The clamp can only meet the requirement of accurately measuring a sample with the section perimeter 1.5 times within the range of the distance between the two electrodes, and the stability and the accuracy of measuring the sample with the conductor section area exceeding the range are difficult to ensure. For example: assuming that the distance between the clamp potential contact and the current contact is 60mm, the circumference of the cross section of the conductor which can be accurately measured is 40mm at most, and the cross section of the conductor is about 127mm 2. Namely, the accuracy of measuring the resistance of a conductor having a sectional area of 127mm2 or more by using the jig cannot be ensured.
Second, when the clamp holds some conductors with irregular cross-sections, such as large cross-section twisted conductors, such conductors are typically fan-shaped, arc-shaped, or triangular in cross-section. When clamping, the current contact clamp can contact well, the potential contact clamp can contact poorly, even when the current contact clamp is tightened, the potential contact clamp can not contact with the conductor, and normal measurement cannot be carried out. When used in such a situation for a long period of time, the jig is also worn and deformed, which still results in the above-mentioned situation.
Disclosure of Invention
The invention provides a cable direct current resistance measuring device and an application method thereof, aiming at overcoming the problems that a cable direct current resistance measuring device in the prior art cannot accurately measure the resistance of a cable conductor with a large cross section and the contact of a potential connector is poor.
In order to achieve the purpose, the invention adopts the following technical scheme:
a cable direct current resistance measuring device comprises a base; the current crimping modules are arranged at two ends of the measuring device and comprise current connectors and conductive connectors, and the current crimping modules are connected with the base in a sliding mode; the current crimping module comprises a current crimping module and two potential press-cutting modules, wherein the current crimping module comprises an upper potential press-cutting module and a lower potential press-cutting module, the upper potential press-cutting module comprises an upper potential press-cutting module potential connector, the lower potential press-cutting module comprises a lower potential press-cutting module potential connector, the upper potential press-cutting module can move relative to the lower potential press-cutting module, the upper potential press-cutting module and the lower potential press-cutting module are respectively connected with a blade, and the blade is respectively electrically connected with the upper potential press-cutting module potential connector and the lower potential press-cutting module potential connector.
The measuring personnel usually measure the resistance of a cable conductor with the length of 1m, so the distance between two potential crimping module potential connecting ports of the measuring device can be fixed to be 1m, the conductive connectors of the current crimping modules at two ends of the measuring device are designed to be in a structure capable of freely moving on the base, and the base is properly lengthened, so that the requirement that the distance between each potential contact and the corresponding current contact is not less than 1.5 times of the section perimeter of a sample can be met. The conductive connector and the potential connector are designed into independent clamping and loosening structures, so that the conductive connector and the potential connector can be ensured to be in close contact with a cable conductor simultaneously, and the problem that the conductive connector and the potential connector cannot be clamped due to abrasion and deformation of a chuck after long-term use can be solved. The blade cuts the insulating layer on the surface of the cable and applies downward pressure to enable the potential contact to be in good contact with the cable conductor, and the problem that a certain conductor with an irregular cross section is clamped by the clamp or the potential contact chuck is difficult to be in good contact with the conductor due to abrasion and deformation of the clamp is solved.
As a preferable technical scheme of the invention, the conductive joint comprises a plurality of metal probe rings distributed from inside to outside.
As a preferred technical scheme of the invention, the metal probe ring comprises a plurality of metal probes which are uniformly distributed along the circumferential direction, so that the current contacts can be uniformly and densely distributed on the end surface of the cable conductor.
As a preferred technical solution of the present invention, the upper potential pressure cutting module is connected to an upper balance pressure base plate, the upper potential pressure cutting module is connected to the upper balance pressure base plate through an upper balance pressure spring, the lower potential pressure cutting module is connected to a lower balance pressure base plate, the lower potential pressure cutting module is connected to the lower balance pressure base plate through a lower balance pressure spring, and the lower balance pressure base plate is fixedly connected to the base.
As a preferred technical solution of the present invention, the upper balance pressure bottom plate is connected to a first hydraulic cylinder, and an anti-displacement rod is disposed between the upper balance pressure bottom plate and the first hydraulic cylinder.
As a preferred technical scheme of the present invention, a slider frame is disposed on the base, a slider is disposed at a lower end of the current crimping module, the slider is slidably connected to the slider frame, and the current crimping module is connected to a second hydraulic cylinder.
As a preferred technical solution of the present invention, a plurality of cable placing plates are disposed between the two electric potential pressure cutting modules, the cable placing plates are respectively connected to lower balance pressure bottom plates, the cable placing plates are connected to the lower balance pressure bottom plates through lower balance pressure springs, and the lower balance pressure bottom plates are fixedly connected to the base.
The invention also discloses an application method of the cable direct current resistance measuring device, which comprises the following steps: the cable is placed on each cable placing plate and two lower potential press-cutting modules, the first hydraulic cylinders are respectively pressed downwards to enable the two upper potential press-cutting modules to compress the cable, blades on the upper potential press-cutting modules and the lower potential press-cutting modules cut a cable insulating layer through downward force and are in good contact with a cable conductor, the second hydraulic cylinders are respectively used for pushing current press-connecting modules at two ends to enable a conductive connector to jack two ends of the cable conductor, current connectors on the two current press-connecting modules are connected through equipment and generate current, the current value and the potential difference of the two potential press-cutting modules are measured, and the resistance of the cable conductor is obtained through calculation.
Compared with the prior art, the invention has the following beneficial effects:
the conductive connectors of the current crimping modules at the two ends of the measuring device are designed to be of a structure capable of freely moving on the base so as to meet the measuring requirements of samples with different sections and ensure the stability and accuracy of the measurement of the samples with large section areas of the conductor;
the conductive connector and the potential connecting port are designed into independent clamping and loosening structures, so that the conductive connector and the potential connecting port are ensured to be simultaneously in close contact with a cable conductor, and the problem that the clamping cannot be realized due to abrasion and deformation of a clamping head in long-term use is solved;
the blade cuts the insulating layer on the surface of the cable and applies downward pressure to make the potential contact point well contact with the cable conductor, so that the problem that a potential contact point chuck is difficult to well contact with the conductor due to the fact that the clamp clamps some conductors with irregular sections or the clamp is abraded and deformed is avoided;
the end face current input method is adopted to test the direct current resistance of the cable conductor, so that the test current directly enters the end face of the conductor from the end face current input clamp through the current lead, the current uniformly enters the conductor, the test current is really ensured to flow through each monofilament to the maximum extent, the contact resistance of the conductor and the clamp is reduced, the unreal test data of the direct current resistance of the conductor is avoided, the quality of the cable product is stabilized, and the cost of the cable is reduced.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a schematic structural view of the conductive contact.
The figures are labeled as follows: a hydraulic cylinder bracket 1; a first hydraulic cylinder 2; a hydraulic cylinder plate 3; an anti-displacement rod 4; an upper balance pressure spring 5; a potential voltage cutting module 6 is arranged; a lower potential press-cutting module 7; a lower balance pressure spring 8; a fixing rod 9; a lower balance pressure bottom plate 10; a conductive contact 11; a current crimping module 12; a second hydraulic cylinder 13; a slider frame 14; a slider 15; a base 16; a current connection port 17; an upper potential pressure cutting module potential connector 18; a lower potential voltage cutting module potential connector 19; an upper balance pressure bottom plate 20; a cable placing plate 21; an insulating base plate 101; a blade 103.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
As shown in fig. 1, a cable dc resistance measuring device includes a base 16, two current crimping modules 12, two potential crimping modules and two cable placing plates 21. Two of them electric current crimping module sets up at base 16 both ends, and two electric potential press cut module sets up between two electric current crimping module 12, and two cables are placed board 21 and are set up in two electric potential press and cut the module and be used for holding and put the cable. The cable placing plates 21 are respectively connected with lower balance pressure bottom plates 10, the cable placing plates 21 are connected with the lower balance pressure bottom plates 10 through lower balance pressure springs 8, and the lower balance pressure bottom plates 10 are fixedly connected with the base 16.
The current crimping module 12 includes a current connection port 17 and a conductive contact 11. As shown in fig. 2, the conductive joint 11 includes a plurality of metal probe rings distributed from inside to outside, and each metal probe ring includes a plurality of metal probes uniformly distributed along the circumferential direction.
The base 16 is fixedly provided with a slide block frame 14, the lower end of the current crimping module 12 is fixedly connected with a slide block 15, the slide block 15 is connected with the slide block frame 14 in a sliding mode, and the current crimping module 12 is connected with a second hydraulic cylinder 13.
The potential pressure cutting module comprises an upper potential pressure cutting module 6 and a lower potential pressure cutting module 7, the upper potential pressure cutting module 6 comprises an upper potential pressure cutting module potential connector 18, and the lower potential pressure cutting module 7 comprises a lower potential pressure cutting module potential connector 19.
Go up potential pressure and cut module 6 and be connected with upper balance pressure bottom plate 20, go up potential pressure and cut module 6 and pass through upper balance pressure spring 5 with upper balance pressure bottom plate 20 and be connected, lower potential pressure is cut module 7 and is connected with lower balance pressure bottom plate 10, and lower potential pressure is cut module 7 and is connected through lower balance pressure spring 8 with lower balance pressure bottom plate 10, and lower balance pressure bottom plate 10 is through a dead lever 9 and base 16 fixed connection.
Go up balanced pressure bottom plate 20 and be connected with first pneumatic cylinder 2, first pneumatic cylinder 2 includes pneumatic cylinder board 3, goes up and is equipped with between balanced pressure bottom plate 20 and the first pneumatic cylinder 2 and prevents displacement pole 4, and first pneumatic cylinder 2 is connected with pneumatic cylinder support 1.
The upper potential pressure cutting module 6 and the lower potential pressure cutting module 7 respectively comprise an insulating bottom plate 101, the upper potential pressure cutting module 6 and the lower potential pressure cutting module 7 are respectively connected with a blade 103, and the blade 103 is respectively electrically connected with the upper potential pressure cutting module potential connector 18 and the lower potential pressure cutting module potential connector 19.
The invention also provides an application method of the cable direct current resistance measuring device, which comprises the following steps: the cable is placed on each cable placing plate 21 and the two lower potential press-cutting modules 7, the first hydraulic cylinders 2 are respectively pressed downwards to enable the two upper potential press-cutting modules 6 to compress the cable, blades 103 on the upper potential press-cutting modules 6 and the lower potential press-cutting modules 7 cut a cable insulation layer through downward pressure and are in good contact with a cable conductor, the second hydraulic cylinders 13 respectively push the current press-connecting modules 12 at two ends to enable the conductive connectors 11 to jack two ends of the cable conductor, the current connectors 17 on the two current press-connecting modules 12 are connected through equipment and generate current, the current value and the potential difference of the two potential press-cutting modules are measured, and the resistance of the cable conductor is obtained through calculation.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A cable direct current resistance measuring device is characterized by comprising
A base;
the current crimping modules are arranged at two ends of the measuring device and comprise current connectors and conductive connectors, and the current crimping modules are connected with the base in a sliding mode;
the current crimping module comprises an upper current crimping module and a lower current crimping module, the upper current crimping module comprises an upper current crimping module potential connector, the lower current crimping module comprises a lower current crimping module potential connector, the upper current crimping module can move relative to the lower current crimping module, the upper current crimping module and the lower current crimping module are respectively connected with a blade, and the blade is respectively electrically connected with the upper current crimping module potential connector and the lower current crimping module potential connector; the conductive joint comprises a plurality of metal probe rings distributed from inside to outside; the upper potential pressure cutting module is connected with an upper balance pressure bottom plate, the upper potential pressure cutting module is connected with the upper balance pressure bottom plate through an upper balance pressure spring, the lower potential pressure cutting module is connected with a lower balance pressure bottom plate, the lower potential pressure cutting module is connected with the lower balance pressure bottom plate through a lower balance pressure spring, and the lower balance pressure bottom plate is fixedly connected with the base.
2. The cable direct-current resistance measuring device according to claim 1, wherein the metal probe ring comprises a plurality of metal probes, and the metal probes are uniformly distributed along the circumferential direction.
3. The device for measuring the direct current resistance of the cable according to claim 1, wherein a first hydraulic cylinder is connected to the upper balance pressure base plate, and an anti-displacement rod is arranged between the upper balance pressure base plate and the first hydraulic cylinder.
4. The device for measuring the direct current resistance of the cable according to claim 1, 2 or 3, wherein a slide block frame is arranged on the base, a slide block is arranged at the lower end of the current crimping module, the slide block is connected with the slide block frame in a sliding manner, and a second hydraulic cylinder is connected with the current crimping module.
5. The device for measuring the direct current resistance of the cable according to claim 4, wherein a plurality of cable placing plates are arranged between the two potential pressure cutting modules, the cable placing plates are respectively connected with lower balance pressure bottom plates, the cable placing plates are connected with the lower balance pressure bottom plates through lower balance pressure springs, and the lower balance pressure bottom plates are fixedly connected with the base.
6. An application method of a cable direct current resistance measuring device comprises the following steps:
the cable is placed on each cable placing plate and two lower potential press-cutting modules, the first hydraulic cylinders are respectively pressed downwards to enable the two upper potential press-cutting modules to compress the cable, blades on the upper potential press-cutting modules and the lower potential press-cutting modules cut a cable insulating layer through downward force and are in good contact with a cable conductor, the second hydraulic cylinders are respectively used for pushing current press-connecting modules at two ends to enable a conductive connector to jack two ends of the cable conductor, current connectors on the two current press-connecting modules are connected through equipment and generate current, the current value and the potential difference of the two potential press-cutting modules are measured, and the resistance of the cable conductor is obtained through calculation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810176199.1A CN109470926B (en) | 2018-03-02 | 2018-03-02 | Cable direct current resistance measuring device and application method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810176199.1A CN109470926B (en) | 2018-03-02 | 2018-03-02 | Cable direct current resistance measuring device and application method thereof |
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| CN109470926A CN109470926A (en) | 2019-03-15 |
| CN109470926B true CN109470926B (en) | 2020-10-16 |
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Citations (1)
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| JP2001349923A (en) * | 2000-06-07 | 2001-12-21 | Totoku Electric Co Ltd | Tester and testing device for judging uniformity of insulation film |
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| CN202383217U (en) * | 2011-12-26 | 2012-08-15 | 石家庄供电公司 | Integrated test bench of transformer |
| JP2013195303A (en) * | 2012-03-21 | 2013-09-30 | Ishimori Seisakusho:Kk | Resistance measuring apparatus |
| CN202651383U (en) * | 2012-04-25 | 2013-01-02 | 柯力士有限公司 | Wire connection device for being connected with multi-core cable, electrical apparatus, and socket |
| CN103777078B (en) * | 2012-10-19 | 2016-04-27 | 远东电缆有限公司 | Cable conductor DC resistance proving installation and method of testing |
| CN103293385B (en) * | 2013-05-14 | 2016-03-02 | 国家电网公司 | Transformer temperature rise test quick test device for direct-current resistance |
| TW201504637A (en) * | 2013-07-23 | 2015-02-01 | Iner Aec Executive Yuan | Method for evaluating cable aging and deterioration by using slice sampling |
| CN205015371U (en) * | 2015-09-30 | 2016-02-03 | 永进超高压电缆股份有限公司 | A electric bridge anchor clamps for measuring big cross -section milliken conductor resistance value |
| CN106786213A (en) * | 2017-01-06 | 2017-05-31 | 国网江西省电力公司电力科学研究院 | A kind of cable rapid axial crush-cutting device |
| CN208383989U (en) * | 2018-03-02 | 2019-01-15 | 国网浙江省电力公司嘉兴供电公司 | A kind of cable direct current resistance m easurem ent device |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2001349923A (en) * | 2000-06-07 | 2001-12-21 | Totoku Electric Co Ltd | Tester and testing device for judging uniformity of insulation film |
Non-Patent Citations (1)
| Title |
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| 电缆质检中导体直流电阻测量不确定度探讨;路志强;《价值工程》;20140916;第74-75页 * |
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