CN101975890A - Measuring method of electrician contact micro-resistance - Google Patents
Measuring method of electrician contact micro-resistance Download PDFInfo
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- CN101975890A CN101975890A CN 201010522536 CN201010522536A CN101975890A CN 101975890 A CN101975890 A CN 101975890A CN 201010522536 CN201010522536 CN 201010522536 CN 201010522536 A CN201010522536 A CN 201010522536A CN 101975890 A CN101975890 A CN 101975890A
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Abstract
The invention discloses a measuring method of electrician contact micro-resistance, relating to a measuring method of electrician contact resistance. The invention solves the problems that the existing measuring method of electrician contact resistance has low measurement precision because of larger contact resistance of each interface. The method comprises the following steps: 1. taking the electrician contact as a workpiece to be measured, and fixing the workpiece to be measured between a positive electrode and a negative electrode; 2. applying 2-6KN of pressure on the workpiece to be measured; 3. after pressure is stabilized, introducing heating current of 3000-6000A to the workpiece to be measured, and stopping electrifying after heating current is kept for 10-100 ms; 4. cooling the workpiece to be measured for 2-5s; 5. introducing 5000-10000A of current to the workpiece to be measured, and measuring the voltage value of two ends of the workpiece to be measured and current value introduced into the workpiece to be measured; and 6. calculating to obtain the resistance value of the workpiece to be measured. The method is suitable for measuring the electrician contact micro-resistance.
Description
Technical field
The present invention relates to a kind of measuring method of electrician's contact resistance.
Background technology
Current, the welding ubiquity electric property problem of unstable of low-voltage electrical apparatus electrician contact, and as the workpiece for measurement resistance of core test stone greatly about micro-ohm even less than the order of magnitude of 1 micro-ohm.Owing to there is each interface contact resistance, cause its contact resistance of not eliminating to be far longer than workpiece for measurement resistance, therefore, and existing resistance measurement method such as bridge method, its measuring accuracy is low, poor stability is low, is difficult to satisfy the requirement of appointment.And existing method is difficult to operation on the low-voltage electrical apparatus welding gear, can't apply to on-the-spot commercial production.
Summary of the invention
The present invention be for the measuring method that solves existing electrician's contact resistance because the contact resistance at each interface causes the low problem of its measuring accuracy more greatly, thereby the measuring method of the little resistance of a kind of electrician's contact is provided.
The measuring method of the little resistance of a kind of electrician's contact, it is realized by following steps:
All be fixed with the silver-colored pad that a height is 0.1mm between the surface of contact of the surface of contact of workpiece for measurement and positive electrode, workpiece to be measured and negative electrode.
The magnitude of voltage of measuring the workpiece for measurement two ends in the step 5 is realized by tension measuring circuit.
Measuring the current value that feeds workpiece for measurement described in the step 5 realizes by the Luo-coil current sensor.
The method of the present invention by applying bigger pressure to electrician's contact and before measuring, electrician's contact being carried out preheating, make the contact condition of electrode and contact better, eliminated interface contact resistance to the full extent, measure accurately thereby improved to make, measuring accuracy of the present invention is higher, and can be applied to easily in the in-site measurement process.
Description of drawings
Fig. 1 is the measuring principle synoptic diagram of the inventive method.
Embodiment
Embodiment one, this embodiment is described in conjunction with Fig. 1, the measuring method of the little resistance of a kind of electrician's contact, it is realized by following steps:
All be fixed with the silver-colored pad 6 that a height is 0.1mm between the surface of contact of the surface of contact of workpiece for measurement 3 and positive electrode 1, workpiece for measurement 3 and negative electrode 2.
Measuring the magnitude of voltage at workpiece for measurement 3 two ends in the step 5 realizes by tension measuring circuit 4.
Measuring the current value that feeds workpiece for measurement 3 described in the step 5 realizes by Luo-coil current sensor 5.
The described medium frequency inverter power supply of present embodiment can be realized the accurate control to size of current and time.
Principle of work: in conjunction with Fig. 1 principle of work of the present invention is described, mark 1 is negative electrode, the 3rd for positive electrode, 2 among the figure, and workpiece for measurement, 4 is an applied pressure for the silver-colored pad of 0.1mm, F highly for tension measuring circuit, 5 is a current transformer, the 6th.The present invention is before energising is measured, at first apply to work to be measured and apply a pressure, by the time make workpiece for measurement pass through a less preheat curent again after pressure stability is got off, can make the contact condition of electrode and contact better by the heat production of welding foroe and electric current like this, eliminate the influence of interface contact resistance fully the resistance of workpiece for measurement.Because the heat that preheat curent produces causes the rising of contact and electrode temperature, can cause the resistance value of contact to become big like this, therefore need after being cooled to room temperature under the condition that keep-ups pressure, measure again.
The basic skills of measuring resistance is to make resistance pass through an electric current, thereby resistance measurement is converted into the measurement of voltage signal.But consider that common constant current source can't provide needed big electric current, therefore this measuring method utilizes the medium frequency inverter resistance welder to make contact pass through a big electric current, thereby the measurement of resistance is converted into the measurement of voltage, current value can be read by current sensor, and then can be by calculating the resistance that converses workpiece for measurement.The concrete numerical value of electric current and pressure can be determined according to concrete contact.
Simultaneously, the present invention increases one deck 0.1mm silver pad 6 between electrode and contact, because the silver strip quality is very soft, improve the contact condition between electrode and the contact greatly, and because the resistance of silver strip is very little, thereby reduced the contact resistance at interface.
The present invention has not only overcome the accuracy problem of the little resistance test of electrician's contact, has also overcome the influence that interface contact resistance is brought, and is easy to operate, can well be applied to on-the-spot automatic industrial production.In addition, this method not only can be carried out Non-Destructive Testing to the workpiece after the welding, and can and touch bridge to contact and carry out independent resistance measurement, thereby judges the quality of single workpiece, even can be extended to the measurement of a lot of little resistance facilities.
The difference of the measuring method of embodiment two, this embodiment and the little resistance of embodiment one described a kind of electrician's contact is, is 3KN～5KN by positive electrode 1 and negative electrode 2 to workpiece for measurement 3 applied pressures in the step 2.
The difference of the measuring method of embodiment three, this embodiment and the little resistance of embodiment one described a kind of electrician's contact is, is 1000A～5000A by positive electrode 1 and negative electrode 2 to the heating current that workpiece for measurement 3 feeds in the step 3.
The difference of the measuring method of embodiment four, this embodiment and the little resistance of embodiment one described a kind of electrician's contact is, is 2000A～4000A by positive electrode 1 and negative electrode 2 to the heating current that workpiece for measurement 3 feeds in the step 3.
The difference of the measuring method of embodiment five, this embodiment and the little resistance of embodiment one described a kind of electrician's contact is, is 6000A～9000A by positive electrode 1 and negative electrode 2 to the electric current that workpiece for measurement 3 feeds in the step 5.
The difference of the measuring method of embodiment six, this embodiment and the little resistance of embodiment one described a kind of electrician's contact is, is 7000A～8000A by positive electrode 1 and negative electrode 2 to the electric current that workpiece for measurement 3 feeds in the step 5.
Claims (10)
1. the measuring method of the little resistance of electrician's contact, it is characterized in that: it is realized by following steps:
Step 1, with electrician's contact as workpiece for measurement (3), described workpiece for measurement (3) is horizontally fixed between positive electrode (1) and the negative electrode (2);
Step 2, to workpiece for measurement (3) apply direction for straight down, size is the pressure of 2KN～6KN;
Step 3, after pressure stability, after workpiece for measurement (3) feeds the heating current of 3000A～6000A and continues 10ms～100ms, stop energising by positive electrode (1) and negative electrode (2);
Step 4, with described workpiece for measurement (3) cooling 2s～5s;
Step 5, feed the electric current of 5000A～10000A to workpiece for measurement (3), and measure the magnitude of voltage at workpiece for measurement (3) two ends and the current value of feeding workpiece for measurement (3) by positive electrode (1) and negative electrode (2);
Step 6, according to magnitude of voltage and current value that step 5 obtains, calculate the resistance value that obtains workpiece for measurement (3).
2. the measuring method of the little resistance of a kind of electrician's contact according to claim 1, it is characterized in that all being fixed with a height between the surface of contact of the surface of contact of workpiece for measurement (3) and positive electrode (1), workpiece for measurement (3) and negative electrode (2) is the silver-colored pad (6) of 0.1mm.
3. the measuring method of the little resistance of a kind of electrician's contact according to claim 1 is characterized in that, measures the magnitude of voltage at workpiece for measurement (3) two ends in the step 5 and realizes by tension measuring circuit (4).
4. the measuring method of the little resistance of a kind of electrician's contact according to claim 1 is characterized in that, measures the current value that feeds workpiece for measurement (3) described in the step 5 and realizes by Luo-coil current sensor (5).
5. the measuring method of the little resistance of a kind of electrician's contact according to claim 1 is characterized in that, step 5 is provided by the medium frequency inverter power supply to the electric current that workpiece for measurement (3) feeds 5000A～10000A by positive electrode (1) and negative electrode (2).
6. the measuring method of the little resistance of a kind of electrician's contact according to claim 1 is characterized in that, is 3KN～5KN by positive electrode (1) and negative electrode (2) to workpiece for measurement (3) applied pressure in the step 2.
7. the measuring method of the little resistance of a kind of electrician's contact according to claim 1 is characterized in that, is 1000A～5000A by positive electrode (1) and negative electrode (2) to the heating current that workpiece for measurement (3) feeds in the step 3.
8. the measuring method of the little resistance of a kind of electrician's contact according to claim 1 is characterized in that, is 2000A～4000A by positive electrode (1) and negative electrode (2) to the heating current that workpiece for measurement (3) feeds in the step 3.
9. the measuring method of the little resistance of a kind of electrician's contact according to claim 1 is characterized in that, is 6000A～9000A by positive electrode (1) and negative electrode (2) to the electric current that workpiece for measurement (3) feeds in the step 5.
10. the measuring method of the little resistance of a kind of electrician's contact according to claim 1 is characterized in that, is 7000A～8000A by positive electrode (1) and negative electrode (2) to the electric current that workpiece for measurement (3) feeds in the step 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105225361A CN101975890B (en) | 2010-10-28 | 2010-10-28 | Measuring method of electrician contact micro-resistance |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010105225361A CN101975890B (en) | 2010-10-28 | 2010-10-28 | Measuring method of electrician contact micro-resistance |
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| CN101975890A true CN101975890A (en) | 2011-02-16 |
| CN101975890B CN101975890B (en) | 2012-06-27 |
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| CN2010105225361A Expired - Fee Related CN101975890B (en) | 2010-10-28 | 2010-10-28 | Measuring method of electrician contact micro-resistance |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102628823A (en) * | 2012-04-12 | 2012-08-08 | 哈尔滨工业大学 | Device for analyzing static contact characteristic of electrical appliance contact material |
| CN111693844A (en) * | 2020-04-22 | 2020-09-22 | 全球能源互联网研究院有限公司 | Test device and test method for pressure-bonding type semiconductor device, and electronic apparatus |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5491424A (en) * | 1994-08-12 | 1996-02-13 | At&T Corp. | System for measuring contamination resistance |
| US6208146B1 (en) * | 1999-02-08 | 2001-03-27 | General Motors Corporation | Method and apparatus for measuring contact resistance for spot welding simulations |
| US20040189307A1 (en) * | 2003-03-31 | 2004-09-30 | Rudholm Stig Olov | Methods and apparatus for analyzing high voltage circuit breakers |
| CN2757136Y (en) * | 2004-12-28 | 2006-02-08 | 中国铝业股份有限公司 | Probe contact head for carbon product resistivity detection |
| CN201141894Y (en) * | 2008-01-07 | 2008-10-29 | 河北农业大学 | Micro-resistance measuring system of high-voltage switch equipment |
-
2010
- 2010-10-28 CN CN2010105225361A patent/CN101975890B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5491424A (en) * | 1994-08-12 | 1996-02-13 | At&T Corp. | System for measuring contamination resistance |
| US6208146B1 (en) * | 1999-02-08 | 2001-03-27 | General Motors Corporation | Method and apparatus for measuring contact resistance for spot welding simulations |
| US20040189307A1 (en) * | 2003-03-31 | 2004-09-30 | Rudholm Stig Olov | Methods and apparatus for analyzing high voltage circuit breakers |
| CN2757136Y (en) * | 2004-12-28 | 2006-02-08 | 中国铝业股份有限公司 | Probe contact head for carbon product resistivity detection |
| CN201141894Y (en) * | 2008-01-07 | 2008-10-29 | 河北农业大学 | Micro-resistance measuring system of high-voltage switch equipment |
Non-Patent Citations (2)
| Title |
|---|
| 《山东省农业管理干部学院学报》 20020630 卫庆 电器装置触头接触电阻值的测量 全文 1-10 , 第3期 2 * |
| 《高压电器》 19891031 郑志翔，等 断路器触头动作与接触电阻的检测 全文 1-10 , 第5期 2 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102628823A (en) * | 2012-04-12 | 2012-08-08 | 哈尔滨工业大学 | Device for analyzing static contact characteristic of electrical appliance contact material |
| CN111693844A (en) * | 2020-04-22 | 2020-09-22 | 全球能源互联网研究院有限公司 | Test device and test method for pressure-bonding type semiconductor device, and electronic apparatus |
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| Publication number | Publication date |
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| CN101975890B (en) | 2012-06-27 |
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