CN108627787B - Standard closed-loop resistor - Google Patents
Standard closed-loop resistor Download PDFInfo
- Publication number
- CN108627787B CN108627787B CN201810224288.9A CN201810224288A CN108627787B CN 108627787 B CN108627787 B CN 108627787B CN 201810224288 A CN201810224288 A CN 201810224288A CN 108627787 B CN108627787 B CN 108627787B
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- Prior art keywords
- wall
- resistor
- shell
- loop
- standard closed
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/005—Calibrating; Standards or reference devices, e.g. voltage or resistance standards, "golden" references
- G01R35/007—Standards or reference devices, e.g. voltage or resistance standards, "golden references"
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/28—Provision in measuring instruments for reference values, e.g. standard voltage, standard waveform
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C1/00—Details
- H01C1/02—Housing; Enclosing; Embedding; Filling the housing or enclosure
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C3/00—Non-adjustable metal resistors made of wire or ribbon, e.g. coiled, woven or formed as grids
Abstract
The application discloses a standard closed-loop resistor which comprises a shell and a resistor, wherein the shell comprises a shell body and a shell cover, the shell cover is arranged above the shell body, the shell body comprises an inner wall, an outer wall and a bottom, the inner wall and the outer wall are connected to the bottom and are parallel to each other, and an annular groove is formed between the inner wall and the outer wall; the resistance sets up in the ring channel between casing inner wall and outer wall, and the surface of resistance leaves the test point. And simultaneously, a test hole is also reserved on the inner wall of the shell. The resistance value of the standard closed-loop resistor is obtained by calculation after the resistance value is used for testing. The standard closed-loop resistor provided by the invention is stable in material and high in accuracy, and the uncertainty is only 0.1%; meanwhile, the standard closed-loop resistor is light, small and convenient to carry, and can be tested in a laboratory and on the spot.
Description
Technical Field
The invention relates to the field of electronics, in particular to a standard closed-loop resistor.
Background
The clamp-on grounding resistance meter is a major breakthrough of the traditional grounding resistance measuring technology, and is widely applied to the grounding resistance measurement of electric power, weather, telecommunication, oil fields, buildings and industrial equipment. The method for measuring the clamp-on grounding resistance meter is completely different from the method adopted by the grounding resistance meter, when a grounding system with a loop is measured, an auxiliary electrode is not needed, a grounding body is not needed to be isolated from a load, and the grounding resistance value can be read from a liquid crystal display screen by only placing the grounding wire to be measured at the geometric center position of a jaw, so that the on-line measurement is realized. When the method is used for measurement, an auxiliary electrode is not used, electrode arrangement errors do not exist, and the result consistency is very good when repeated tests are carried out. The clamp-on grounding resistance meter is more and more widely applied, whether the product is qualified or not and whether the performance meets the technical indexes or not are judged, and a measurement test is needed.
The clamp-on ground resistance tester generally adopts a standard resistor method, and two output end buttons of the standard resistor are connected by a lead to form a loop. The clamp-on grounding resistance tester clamps the connecting wire and enables the connecting wire to be positioned at the geometric center of the clamp head as much as possible and to be perpendicular to the clamp head, the standard resistor is adjusted to a test point, the display value of the clamp-on grounding resistance tester is read, and the error of the display value is calculated. But the resistance of the connecting wire and the contact resistance of the wire and the standard resistor are added in a measuring loop, so that the accuracy of the measuring result is not high; in addition, the size of a closed loop formed by the length of the wire is large, and the flexible wire cannot be accurately placed in the geometric center of the jaw, so that the measurement result is influenced.
Therefore, the invention provides a standard closed-loop resistor, which is made of stable materials and has high accuracy, and the uncertainty is only 0.1%; meanwhile, the standard closed-loop resistor is light, small and convenient to carry, and can be tested in a laboratory and on the spot.
Disclosure of Invention
In view of the above, in order to solve the problem that the existing clamp-on ground resistance tester has large error and low precision of the test resistor, the application provides a standard closed-loop resistor, which is made of stable materials and has high accuracy, and the uncertainty is only 0.1%; meanwhile, the standard closed-loop resistor is light, small and convenient to carry, and can be tested in a laboratory and on the spot.
The embodiment of the application provides a standard closed-loop resistor, which comprises a shell and a resistor, wherein the shell comprises a shell body and a shell cover, the shell cover is arranged above the shell body, the shell body comprises an inner wall, an outer wall and a bottom, the inner wall and the outer wall are connected to the bottom and are parallel to each other, and an annular groove is formed between the inner wall and the outer wall; the resistance sets up in the ring channel between casing inner wall and outer wall, and the surface of resistance leaves the test point.
Preferably, the material of the resistor is manganese copper or constantan.
Preferably, the housing cover and the housing are fixedly connected by screws.
Preferably, the inner wall of the housing is left with a test hole.
Preferably, the shell is made of polytetrafluoroethylene.
Preferably, the test point of the resistance surface is a manganin or constantan steel plate with a rubber hole, and is connected with the resistance by welding.
Preferably, the inner wall and the outer wall of the shell of the resistance shell are both square, wherein the size of the outer wall is 100mm multiplied by 90mm, and the size of the inner wall is 70mm multiplied by 65 mm.
Preferably, the resistor is welded to form a loop.
The embodiment of the application adopts at least one technical scheme which can achieve the following beneficial effects: the accuracy is high, and the uncertainty is only 0.1%; meanwhile, the standard closed-loop resistor is light, small and convenient to carry, and can be tested in a laboratory and on the spot.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application.
In the drawings:
FIG. 1 is a cut-away top view of a standard closed loop resistor of one embodiment of the present invention;
FIG. 2 is a top view of a housing of a standard closed loop resistor of one embodiment of the present invention;
fig. 3 is a block diagram of the housing of a standard closed-loop resistor in accordance with one embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Fig. 1 is a cut-away top view of a standard closed-loop resistor of one embodiment of the invention, fig. 2 is a top view of a housing of a standard closed-loop resistor of one embodiment of the invention, and fig. 3 is a structural view of a housing of a standard closed-loop resistor of one embodiment of the invention. As shown in fig. 1 to 3, the standard closed-loop resistor comprises a housing and a resistor, wherein the housing comprises a shell 5 and a shell cover 4, the shell cover is arranged above the housing, the housing comprises an inner wall 3, an outer wall 1 and a bottom 9, the inner wall and the outer wall are connected to the bottom and are parallel to each other, and therefore, an annular groove 8 is formed between the inner wall and the outer wall; the resistor 2 is arranged in an annular groove between the inner wall and the outer wall of the shell, and the surface of the resistor is provided with a plurality of test points, for example, three test point positions are shown in A, B, C. Preferably, the lengths of the resistors between two adjacent test points are the same.
The resistor is made of manganin or constantan, and a loop is formed by welding the manganin or the constantan through anti-oxidation soldering tin. The test point A, B, C left on the surface of the resistor is a manganese copper or constantan copper plate with rubber holes, which are uniformly placed on the resistor, make good contact with it and are fixed in relative position. And the connection of the test point and the resistor is also performed by adopting an anti-oxidation soldering tin welding method. The inner wall of the shell is provided with a test hole 7, and the test hole corresponds to the test point. The shell body and the shell cover of the shell are fixedly connected through screws. When assembling the resistor, the resistor is fixed between the inner wall and the outer wall of the shell body, then the shell cover of the shell is arranged above the shell body, the shell body and the shell cover are fixedly connected together through the screw 6, and then the resistor is fixed inside the shell.
In one embodiment of the present invention, the standard closed-loop resistor casing is made of teflon, which is tested to be non-electromagnetic interference and strong and not easy to deform. The standard closed-loop resistor is provided with ten specifications of 0.01 omega, 0.05 omega, 0.1 omega, 0.2 omega, 0.5 omega, 1 omega, 2 omega, 5 omega and 10 omega. Wherein the resistance materials of 0.01 omega, 0.05 omega, 0.1 omega, 0.2 omega, 0.5 omega and 1 omega adopt manganese copper resistance wires, and the resistance materials of 2 omega, 5 omega and 10 omega adopt constantan resistance wires. The resistance wire is made of materials according to resistance and length, and the resistance wire with proper resistivity, diameter and power can be fixed inside a standard closed-loop resistor shell. Meanwhile, the resistance of the standard closed-loop resistor needs to be aged and checked for three months, and a resistance wire with small relative change of resistance is screened out.
When the standard closed-loop resistor provided by the invention is applied to the test of the pincer-shaped ground resistance tester, the resistance value of the standard closed-loop resistor is selected according to the measuring range of the pincer-shaped ground resistance tester, so that the standard closed-loop resistor can be covered by the measuring range of the pincer-shaped ground resistance tester. And then the clamp-on grounding resistance tester is connected with the test point arranged on the standard closed-loop resistor through the test hole on the inner wall of the standard closed-loop resistor shell in a non-contact manner. And reading the value displayed by the clamp-on grounding resistance tester, and gradually replacing the standard closed-loop resistor to read the value. According to the error calculation formula and the technical index of the clamp-on grounding resistance tester, whether the tester is qualified or not can be judged.
The standard closed-loop resistor provided by the invention is stable in material and high in accuracy, and the uncertainty is only 0.1%; meanwhile, the standard closed-loop resistor is light, small and convenient to carry, and can be tested in a laboratory and on the spot.
The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the present application.
Claims (4)
1. A standard closed-loop resistor is characterized by comprising a shell and a resistor, wherein the shell comprises a shell body and a shell cover, the shell cover is arranged above the shell body, the shell body comprises an inner wall, an outer wall and a bottom, the inner wall and the outer wall are connected to the bottom and are parallel to each other, and an annular groove is formed between the inner wall and the outer wall; the resistor is arranged in an annular groove between the inner wall and the outer wall of the shell, and a plurality of test points are reserved on the surface of the resistor;
the resistance is a manganin or constantan resistance wire; the resistor forms a loop in a welding mode;
the test points are manganin or constantan copper plates with rubber holes and are uniformly arranged on the resistor; welding the test point with a resistor;
the inner wall of the shell is provided with a test hole, and the test hole corresponds to the test point; the test hole is used for non-contact connection between the clamp-on grounding resistance tester and the test point arranged on the resistance of the standard closed-loop resistor.
2. A standard closed-loop resistor according to claim 1, wherein the cover and the housing are fixedly connected by screws.
3. The standard closed-loop resistor of claim 1 wherein the housing is a polytetrafluoroethylene material.
4. The standard closed-loop resistor of claim 1 wherein the inner and outer walls of the body of the resistive housing are square, with outer wall dimensions of 100mm x 90mm and inner wall dimensions of 70mm x 65 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810224288.9A CN108627787B (en) | 2018-03-19 | 2018-03-19 | Standard closed-loop resistor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810224288.9A CN108627787B (en) | 2018-03-19 | 2018-03-19 | Standard closed-loop resistor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108627787A CN108627787A (en) | 2018-10-09 |
| CN108627787B true CN108627787B (en) | 2022-04-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810224288.9A Active CN108627787B (en) | 2018-03-19 | 2018-03-19 | Standard closed-loop resistor |
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| CN (1) | CN108627787B (en) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2409286A (en) * | 2003-12-19 | 2005-06-22 | Advanced Analysis And Integrat | Loop resistance measurement and calibration standard |
| CN2896293Y (en) * | 2006-05-16 | 2007-05-02 | 符美安 | Pliers-shape earthing resistance instrument |
| CN201083822Y (en) * | 2007-08-10 | 2008-07-09 | 张今哲 | Loop resistance calibration ring |
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2018
- 2018-03-19 CN CN201810224288.9A patent/CN108627787B/en active Active
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| CN108627787A (en) | 2018-10-09 |
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