CN114355043A - Structure and method for testing contact resistance of capacitor terminal for flexible and straight engineering - Google Patents
Structure and method for testing contact resistance of capacitor terminal for flexible and straight engineering Download PDFInfo
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- CN114355043A CN114355043A CN202111622373.9A CN202111622373A CN114355043A CN 114355043 A CN114355043 A CN 114355043A CN 202111622373 A CN202111622373 A CN 202111622373A CN 114355043 A CN114355043 A CN 114355043A
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Abstract
The invention discloses a test structure of contact resistance of a capacitor terminal for a flexible and straight project, which comprises a capacitor cover plate and an insulating sleeve, wherein the capacitor cover plate is fixedly arranged on the upper end surface of the capacitor cover plate; a method for testing contact resistance of a capacitor terminal for a flexible-straight project comprises S1, firstly, adopting an external bus bar with the specification of 100mm multiplied by 40mm multiplied by 6mm, forming a mounting hole on the external bus bar, pressing the mounting hole on the outer surface of a round nut, and aligning the mounting hole on the external bus bar with an inner counter bore of the capacitor terminal. According to the invention, the anode of the resistance tester is clamped on the determined distance point of the copper busbar through the electrode, and then is connected with the inner counter bore of the capacitor terminal through the copper guide rod, and the cathode of the resistance tester is clamped on the determined distance point of the copper guide rod through the other electrode, so that the contact resistance between the internal thread of the round nut and the external thread of the terminal can be tested.
Description
Technical Field
The invention relates to the technical field of power transmission engineering, in particular to a structure and a method for testing contact resistance of a capacitor terminal for flexible and straight engineering.
Background
The flexible direct-current transmission project adopts a multi-level sub-module series connection mode, unique advantages of power flow reversal, reactive power and active power independent control can be achieved, and the flexible direct-current transmission project is gradually popularized and applied in the market. The safe operation of the direct current support capacitor plays an important role in the operation of the MMC, and an external busbar is in surface contact with a round nut through a terminal of the direct current support capacitor (hereinafter referred to as a capacitor) to form a through-flow loop. The capacitor terminal is internally provided with a threaded counter bore, the exterior of the capacitor terminal is provided with threads, and the internal threads of the round nut are connected with the external threads of the terminal to form a through-flow loop; the bolt is screwed into the threaded counter bore to tightly press the busbar on the outer surface of the round nut, so that a through-flow loop is formed with the outside, as shown in figures 3 and 4;
the reliability of round nut internal thread and terminal external screw thread contact can directly influence the security of product operation, especially has the condition of vibration at the operation in-process, and poor contact directly can lead to the end to discharge, contact grow, temperature rise grow, can cause the condenser to damage even burn out when serious. The reliability of contact can be measured by testing the contact resistance of the contact surface, the contact area is small, the contact resistance is increased, and the temperature is increased; on the contrary, the contact area is large, the contact resistance is small, the temperature rise is low, and the operation is safer. Therefore, the contact reliability can be evaluated by measuring the contact resistance, and the safety of product operation is ensured. Particularly, the parallelism test of products with the same structure is carried out, and the test result has important significance for evaluating whether the contact is good or not. Usually, a resistance tester is used for testing a resistance loop, the structure of the resistance tester is shown in figure 1, and the resistance tester is provided with two connecting wires, namely, an inlet (anode) and an outlet (cathode), wherein the anode connecting wire is connected to one end of a tested product, and the cathode connecting wire is connected to the other end of the tested product, so that the resistance test of the tested product can be carried out.
However, because the capacitor terminal is of an inner counter bore structure, the two-pole connecting wire clamp of the resistance tester cannot be directly clamped and connected at two ends, and the contact resistance between the internal thread of the round nut and the external thread of the terminal can be tested only through a specially designed test loop.
In order to solve the above problems, the present invention provides a structure and a method for testing a contact resistance of a capacitor terminal for a flexible and straight engineering.
Disclosure of Invention
Based on the technical problems in the background art, the invention provides a structure and a method for testing the contact resistance of a capacitor terminal for flexible and straight engineering.
The invention provides a test structure of contact resistance of a capacitor terminal for a flexible-straight project, which comprises a capacitor cover plate and an insulating sleeve, wherein the capacitor cover plate is fixedly arranged on the upper end surface of the capacitor cover plate, a capacitor terminal is arranged in the insulating sleeve, the capacitor terminal is fixedly arranged on the capacitor cover plate, an inner counter bore is vertically formed in the center of the capacitor terminal, a copper guide rod is vertically connected to the center of the capacitor terminal through a thread, a round nut is sleeved on the side wall of the capacitor terminal, an external bus bar is sleeved on the copper guide rod, the lower end surface of the external bus bar abuts against the round nut, a copper nut and an insulating gasket are sleeved on the upper half part of the copper guide rod, the copper nut is in threaded connection with the copper guide rod, and the insulating gasket is positioned between the copper nut and the external bus bar.
Preferably, the external busbar is provided with a mounting hole matched with the copper guide rod, a gap is formed between the mounting hole and the side wall of the copper guide rod, and the inner wall of the mounting hole is provided with an insulating adhesive tape matched with the gap.
Preferably, the round nut is sleeved at the upper end of the capacitor terminal in a threaded manner, an annular groove matched with the round nut is formed in the upper end face of the insulating sleeve, and the lower half portion of the round nut abuts against the inside of the annular groove.
Preferably, one end of the external busbar is provided with an electrode clamp, the upper end of the copper guide rod is provided with another electrode clamp, and the two electrode clamps are respectively connected with a resistance tester through positive and negative leads.
A method for testing contact resistance of a capacitor terminal for flexible and straight engineering is characterized by comprising the following steps:
s1, firstly, adopting an external busbar with the specification of 100mm multiplied by 40mm multiplied by 6mm, forming a mounting hole on the external busbar, pressing the mounting hole on the external busbar on the outer surface of the round nut, and aligning the mounting hole on the external busbar with an inner counter bore of a capacitor terminal;
s2, screwing a copper guide rod with the specification of M16 and the length of 100mm into an inner counter bore of a capacitor terminal, wrapping the contact position of the lower part of the copper guide rod and an external bus bar by using an insulating tape, and compressing the upper end of the copper guide rod by using an insulating gasket and a copper nut to avoid short circuit caused by direct contact of the copper guide rod and the external bus bar;
s3, tightening the copper nut at the upper end to ensure that the bottom of the copper guide rod is well contacted with the inner counter bore of the capacitor terminal;
s4, connecting the positive pole of the resistance tester at the position 80mm away from the external bus bar to the terminal through an electrode clamp, and connecting the negative pole at the position 80mm away from the capacitor terminal through another electrode clamp;
s5, turning on the resistance tester to perform the loop resistance test, the result is RReturning;
s6: resistance R for calculating length of external busbar 80mmRow 1Contact resistance R of contact surface of external busbar and round nutRow 2(ii) a And a resistor R of 80mm length of the copper guide rodGuide 1Contact resistance R of copper guide rod and counter bore in capacitor terminalGuide 2The calculation formula is as follows: r ═ ρ L/S, where: rho is the resistivity of copper, L is the length or thickness of the conductor, and S is the cross-sectional area or contact surface area of the conductor;
s7 contact resistance of the round nut and the capacitor terminal is RHui 1＝RGo back to-RRow 1-RRow 2-RGuide 1-RAnd (3) leading the carbon fiber to be 2.
The invention has the beneficial effects that:
according to the invention, an external bus bar is contacted with a round nut, the anode of a resistance tester is clamped on a determined distance point of a copper bus bar through an electrode, and then is connected with an inner counter bore of a capacitor terminal through a copper guide rod, and the cathode of the resistance tester is clamped on the determined distance point of the copper guide rod through another electrode, so that the contact resistance between the internal thread of the round nut and the external thread of the terminal can be tested; and the side wall of the copper guide rod is provided with a round nut and an insulating gasket, so that the short circuit caused by direct contact with the round nut is avoided.
Drawings
FIG. 1 is a testing circuit diagram of a testing structure for testing contact resistance of a capacitor terminal for soft and straight engineering according to the present invention;
FIG. 2 is a side cross-sectional view of a testing structure for contact resistance of a flexible-straight engineering capacitor terminal according to the present invention;
FIG. 3 is a structural diagram of a capacitor terminal in a testing structure of a contact resistance of a capacitor terminal for a soft and straight engineering according to the present invention;
fig. 4 is a diagram of a current loop in a test structure of a contact resistance of a capacitor terminal for soft and straight engineering according to the present invention.
In the figure: 1 electrode clamp, 2 external busbars, 3 round nuts, 4 insulating tapes, 5 copper guide rods, 6 copper nuts, 7 insulating gaskets, 8 capacitor cover plates, 9 insulating sleeves and 10 capacitor terminals.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, specific embodiments accompanied with figures are described in detail below, and it is apparent that the described embodiments are a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making creative efforts based on the embodiments of the present invention, shall fall within the protection scope of the present invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described and will be readily apparent to those of ordinary skill in the art without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.
Furthermore, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
The present invention will be described in detail with reference to the drawings, wherein the cross-sectional views illustrating the structure of the device are not enlarged partially in general scale for convenience of illustration, and the drawings are only exemplary and should not be construed as limiting the scope of the present invention. In addition, the three-dimensional dimensions of length, width and depth should be included in the actual fabrication.
Meanwhile, in the description of the present invention, it should be noted that the terms "upper, lower, inner and outer" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation and operate, and thus, cannot be construed as limiting the present invention. Furthermore, the terms first, second, or third are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The terms "mounted, connected and connected" in the present invention are to be understood broadly, unless otherwise explicitly specified or limited, for example: can be fixedly connected, detachably connected or integrally connected; they may be mechanically, electrically, or directly connected, or indirectly connected through intervening media, or may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example one
Referring to fig. 1-4, a gentle test structure who directly engineers capacitor terminal contact resistance, including condenser apron 8, insulation support 9, condenser apron 8 fixed mounting is at condenser apron 8's up end, be provided with condenser terminal 10 in insulation support 9, condenser terminal 10 fixed mounting is on condenser apron 8, the vertical interior counter bore of having seted up of center department of condenser terminal 10, condenser terminal 10 center department vertical threaded connection has copper guide rod 5, the cover is equipped with round nut 3 on condenser terminal 10's the lateral wall, the cover is equipped with outside female row 2 on the copper guide rod 5, the lower terminal surface of outside female row 2 supports on round nut 3, the first half cover of copper guide rod 5 is equipped with copper nut 6 and insulating gasket 7, threaded connection between copper nut 6 and the copper guide rod 5, insulating gasket 7 is located between copper nut 6 and the outside female row 2.
The outer bus bar 2 is provided with a mounting hole matched with the copper guide rod 5, a gap is formed between the mounting hole and the side wall of the copper guide rod 5, an insulating tape 4 matched with the gap is arranged on the inner wall of the mounting hole, and the insulating tape 4 is wound on the copper guide rod 5;
the round nut 3 is sleeved at the upper end of the capacitor terminal 10 in a threaded manner, an annular groove matched with the round nut 3 is formed in the upper end face of the insulating sleeve 9, and the lower half part of the round nut 3 abuts against the inside of the annular groove;
wherein, the one end of female 2 of arranging externally is provided with electrode holder 1, and the upper end of copper guide arm 5 is provided with another electrode holder 1, and two electrode holders 1 are connected with the resistance tester through positive negative pole wire respectively.
The invention also discloses a method for testing the contact resistance of the capacitor terminal for the flexible-straight engineering, which comprises the following steps of firstly, adopting an external bus bar 2 with the specification of 100 multiplied by 40 multiplied by 6 (length multiplied by width multiplied by thickness) mm, forming a mounting hole on the external bus bar 2, pressing the mounting hole on the outer surface of a round nut 3, and aligning the mounting hole on the external bus bar 2 with an inner counter bore of a capacitor terminal 10;
secondly, a copper guide rod 5 with the specification of M16 and the length of 100mm is screwed into an inner counter bore of the capacitor terminal 10, the position, in which the lower part of the copper guide rod 5 is contacted with the external busbar 2, is wrapped by an insulating tape 4, and the upper end of the copper guide rod is compressed by an insulating gasket 7 and a copper nut 6, so that short circuit caused by direct contact of the copper guide rod 5 and the external busbar 2 is avoided;
further, the copper nut 6 at the upper end is screwed down, so that the bottom of the copper guide rod 5 is well contacted with the inner counter bore of the capacitor terminal 10;
then, connecting the positive electrode of the resistance tester at a position 80mm away from the terminal of an external bus bar 2 through an electrode clamp 1, and connecting the negative electrode at a position 80mm away from the capacitor terminal 10 of a copper guide rod 5 through another electrode clamp 1;
then, the resistance tester is started to perform the loop resistance test, and the result is RGo back to；
Further, calculating the resistance R of the external busbar 2, 80mm in lengthRow 1Contact resistance R of contact surface of external busbar 2 and round nut 3Row 2(ii) a And a copper guide rod 5, a resistor R of 80mm lengthGuide 1Contact resistance R of copper guide rod 5 and counter bore in capacitor terminal 10Guide 2The calculation formula is as follows: r ═ ρ L/S, where: rho is the resistivity of copper, L is the length or thickness of the conductor, and S is the cross-sectional area or contact surface area of the conductor;
finally, the contact resistance of the round nut with the capacitor terminal 10 is RHui 1＝RGo back to-RRow 1-RRow 2-RGuide 1-RGuide 2。
Example two
The second embodiment is different from the first embodiment in that: the inner counter bore at the center of the capacitor terminal 10 is set to be solid, a copper guide rod 5 does not need to be inserted, the negative electrode of the contact resistance tester can be directly connected with the upper end of the capacitor terminal 10, and the positive electrode of the resistance tester is pressed on the round nut 3 to test the loop resistance.
According to the invention, an external bus bar 2 is contacted with a round nut 3, and the anode of a resistance tester is connected to a distance point determined by a copper bus bar; then the resistance tester is connected with the inner counter bore of the capacitor terminal 10 through the copper guide rod 5, and the negative pole of the resistance tester is connected with the determined distance point of the copper guide rod 5; the side wall of the copper guide rod 5 is provided with the round nut 3 and the insulating gasket 7, so that short circuit caused by direct contact with the round nut 3 is avoided.
According to the invention, by designing a special loop, the contact resistance between the inside of the round nut 3 and the external thread of the capacitor terminal 10 can be tested, and the special loop plays an important role in evaluating whether the loop through-current contact is good or not; the invention adopts the copper busbar with specific specification of 100 multiplied by 40 multiplied by 6 (length multiplied by width multiplied by thickness) mm, M16 guide rod and length of 100mm, the resistance tester is connected at the position 80mm away from the busbar and the copper guide rod to the terminal, and the contact resistance of the section of conductor can be accurately calculated or tested; the contact resistance of the external busbar 2 and the surface of the round nut 3 and the contact resistance of the copper guide rod 5 and the counter bore in the capacitor terminal 10 can be obtained through calculation;
the scheme has an important guiding function for simultaneously carrying out resistance test comparison on products of the same type in batches and discriminating abnormal products with contact resistance caused by poor contact.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (5)
1. The utility model provides a test structure of capacitor terminal contact resistance for gentle straight engineering, includes condenser apron (8), insulating sleeve (9), its characterized in that, condenser apron (8) fixed mounting is at the up end of condenser apron (8), be provided with capacitor terminal (10) in insulating sleeve (9), capacitor terminal (10) fixed mounting is on condenser apron (8), the vertical counter bore that has seted up of center department of capacitor terminal (10), the vertical threaded connection of condenser terminal (10) center department has copper guide rod (5), the cover is equipped with round nut (3) on the lateral wall of capacitor terminal (10), the cover is equipped with outside female arranging (2) on copper guide rod (5), the lower terminal surface of outside female arranging (2) supports on round nut (3), the first cover of copper guide rod (5) is equipped with copper nut (6) and insulating gasket (7), the copper nut (6) is in threaded connection with the copper guide rod (5), and the insulating gasket (7) is located between the copper nut (6) and the external busbar (2).
2. The structure for testing the contact resistance of the capacitor terminal for the flexible and straight engineering according to claim 1, wherein the outer busbar (2) is provided with a mounting hole matched with the copper guide rod (5), a gap is formed between the mounting hole and the side wall of the copper guide rod (5), and an insulating tape (4) matched with the gap is arranged on the inner wall of the mounting hole.
3. The structure for testing the contact resistance of the capacitor terminal for the flexible and straight engineering as claimed in claim 1, wherein the round nut (3) is sleeved at the upper end of the capacitor terminal (10) in a threaded manner, an annular groove matched with the round nut (3) is formed in the upper end surface of the insulating sleeve (9), and the lower half part of the round nut (3) is abutted in the annular groove.
4. The structure for testing the contact resistance of the capacitor terminal for the flexible and straight engineering according to claim 1, wherein one end of the external busbar (2) is provided with one electrode clamp (1), the upper end of the copper guide rod (5) is provided with the other electrode clamp (1), and the two electrode clamps (1) are respectively connected with a resistance tester through positive and negative leads.
5. A method for testing contact resistance of a capacitor terminal for flexible and straight engineering is characterized by comprising the following steps:
s1, firstly, adopting an external busbar (2) with the specification of 100mm multiplied by 40mm multiplied by 6mm, forming a mounting hole on the external busbar (2), pressing the mounting hole on the outer surface of the round nut (3), and aligning the mounting hole on the external busbar (2) with an inner counter bore of the capacitor terminal (10);
s2, screwing a copper guide rod (5) with the specification of M16 and the length of 100mm into an inner counter bore of a capacitor terminal (10), wrapping the contact position of the lower part of the copper guide rod (5) and an external busbar (2) by using an insulating tape (4), and compressing the upper end of the copper guide rod by using an insulating gasket (7) and a copper nut (6) to avoid short circuit caused by direct contact of the copper guide rod (5) and the external busbar (2);
s3, screwing the upper copper nut (6) to ensure that the bottom of the copper guide rod (5) is well contacted with the inner counter bore of the capacitor terminal (10);
s4, connecting the positive electrode of the resistance tester at a position 80mm away from the terminal of the external busbar (2) through the electrode clamp (1), and connecting the negative electrode at a position 80mm away from the capacitor terminal (10) of the copper guide rod (5) through the other electrode clamp (1);
s5, turning on the resistance tester to perform the loop resistance test, the result is RReturning;
s6: resistance R for calculating length of 80mm of external busbar (2)Row 1Contact resistance R of contact surface of external busbar (2) and round nut (3)Row 2(ii) a And a resistor R of 80mm length of the copper guide rod (5)Guide 1Contact resistance R of copper guide rod (5) and counter bore in capacitor terminal (10)Guide 2The calculation formula is as follows: r ═ ρ L/S, where: rho is the resistivity of copper, L is the length or thickness of the conductor, and S is the cross-sectional area or contact surface area of the conductor;
s7, the contact resistance of the round nut (3) and the capacitor terminal (10) is RHui 1＝RGo back to-RRow 1-RRow 2-RGuide 1-RGuide 2。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111622373.9A CN114355043A (en) | 2021-12-28 | 2021-12-28 | Structure and method for testing contact resistance of capacitor terminal for flexible and straight engineering |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111622373.9A CN114355043A (en) | 2021-12-28 | 2021-12-28 | Structure and method for testing contact resistance of capacitor terminal for flexible and straight engineering |
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| Publication Number | Publication Date |
|---|---|
| CN114355043A true CN114355043A (en) | 2022-04-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111622373.9A Pending CN114355043A (en) | 2021-12-28 | 2021-12-28 | Structure and method for testing contact resistance of capacitor terminal for flexible and straight engineering |
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| Country | Link |
|---|---|
| CN (1) | CN114355043A (en) |
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2021
- 2021-12-28 CN CN202111622373.9A patent/CN114355043A/en active Pending
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