CN113267654A - Electrical test fixture for high-voltage circuit breaker - Google Patents
Electrical test fixture for high-voltage circuit breaker Download PDFInfo
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- CN113267654A CN113267654A CN202110822085.1A CN202110822085A CN113267654A CN 113267654 A CN113267654 A CN 113267654A CN 202110822085 A CN202110822085 A CN 202110822085A CN 113267654 A CN113267654 A CN 113267654A
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- metal
- circuit breaker
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- sliding rod
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- 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
- G01R1/02—General constructional details
- G01R1/04—Housings; Supporting members; Arrangements of terminals
- G01R1/0408—Test fixtures or contact fields; Connectors or connecting adaptors; Test clips; Test sockets
Abstract
The application discloses high voltage circuit breaker electrical test anchor clamps includes: the number of the elastic plug parts of the circuit breaker is 3, and the elastic plug parts are contacted with the inner wall of the three-phase contact arm of the circuit breaker through an elastic structure; the metal elastic sliding rod part comprises an insulation guide seat, a metal short connection seat, a metal sliding rod and a short connection piece on the metal sliding rod, the metal sliding rod penetrates through the insulation guide seat in a sliding mode, two telescopic metal marbles are arranged inside the metal short connection seat oppositely, the diameter of the metal sliding rod is smaller than the distance between the two metal marbles, and a sliding groove corresponding to the metal marbles is formed in the short connection piece; the test clamp holding component comprises a limiting plate and a connecting plate; the number of the insulating guide seats, the metal short connecting seats and the short connecting pieces is consistent with that of the elastic plug parts of the circuit breaker; the insulating guide seat and the metal short connecting seat are fixedly connected with the elastic plug component of the circuit breaker; pushing the metal slide bar brings each stub into contact with a metal marble. The test result of this application can solve prior art lacks the technical problem of reliability.
Description
Technical Field
The application relates to the technical field of high-voltage circuit breaker tests, in particular to an electrical test fixture for a high-voltage circuit breaker.
Background
High-voltage circuit breakers, which are one of the most critical electrical devices in an electrical network, have the ability to break and close load currents and to break short-circuit currents in the event of a fault. Once a high-voltage circuit breaker breaks down, the safety and stable operation of a power grid are seriously threatened, and adverse social effects and major economic losses are caused. The power grid accidents caused by the faults of the high-voltage circuit breakers occur every year, and the high-voltage circuit breaker rejection accidents account for 22.67% according to incomplete statistics of accidents in the operation of the high-voltage circuit breakers of the national power system; the closing rejection rate accounts for 6.48 percent; the on-off accident accounts for 9.07%; insulation accidents account for 35.47%; the misoperation accident accounts for 7.02%; the closure accident accounts for 7.95%; external forces and other accidents account for 11.43%. In order to ensure the operational reliability of the high-voltage circuit breaker, it is necessary to perform an electrical test on the circuit breaker.
When a circuit resistance test clamp is applied to a current 10kV high-voltage circuit breaker to perform a circuit resistance test, a current end and a voltage end contact the same contact finger, most of contact resistance of a plum blossom contact and a circuit breaker contact arm is introduced into a test result, and the finally measured resistance value is large; the circuit resistance test has an interphase loop resistance test and a three-phase integral ground loop resistance test, the upper port and the lower port of the 10kV high-voltage circuit breaker are not short-circuited three-phase, the upper port and the lower port of the 10kV high-voltage circuit breaker are respectively short-circuited three-phase when the three-phase integral ground loop resistance test is carried out, secondary clamping is carried out on certain circuit breaker ports when the interphase short-circuit is carried out, and due to the limitation of the plum blossom contact size of the 10kV high-voltage circuit breaker ports, the tail end working position of the six-axis mechanical arm is interfered with the test tongs when the six-axis mechanical arm carries out secondary clamping test tongs.
Disclosure of Invention
The application provides an electrical test fixture for a high-voltage circuit breaker, which is used for solving the technical problem that the prior test technology needs secondary clamping test tongs when being used for a loop resistance test, and cannot avoid the condition of accessing a large contact resistance, so that the test result lacks reliability.
In view of this, the present application provides in a first aspect an electrical test fixture for a high voltage circuit breaker, comprising: the circuit breaker comprises a circuit breaker elastic plug component, a metal elastic sliding rod component and a test clamp holding component;
the number of the circuit breaker elastic plug components is 3, each circuit breaker elastic plug component comprises a moving end and a fixed end, the moving ends are in flexible connection with the fixed ends, and the 3 moving ends are respectively contacted with the inner walls of three-phase contact arms of the circuit breaker through elastic structures;
the metal elastic sliding rod part comprises an insulation guide seat, a metal short connection seat, a metal sliding rod and a short connection piece arranged on the metal sliding rod, the metal sliding rod penetrates through the insulation guide seat in a sliding mode, two telescopic metal marbles are arranged in the metal short connection seat in an opposite mode, the diameter of the metal sliding rod is smaller than the distance between the two metal marbles, the outer diameter of the short connection piece is larger than the distance between the two metal marbles, and a sliding groove corresponding to the metal marbles is formed in the short connection piece;
the test clamp holding component comprises a limiting plate and a connecting plate;
the number of the insulating guide seats, the number of the metal short connecting seats and the number of the short connecting pieces are consistent with the number of the elastic plug components of the circuit breaker;
the insulating guide seat and the metal short-circuit seat of the metal elastic sliding rod component are fixedly connected with the fixed end of the circuit breaker elastic plug component;
pushing the metal sliding rod to enable each short-circuit piece to be in contact with the metal marble, and achieving short circuit of 3 elastic plug components of the circuit breaker;
and a connecting plate in the test clamp holding part is fixedly connected with the elastic plug part of the circuit breaker.
Optionally, the fixed ends of the 3 elastic plug components of the circuit breaker are fixedly connected through an insulating fixed bracket component.
Optionally, the insulating fixed bracket component includes an upper support rod, a lower support rod and a support column;
the upper supporting rod and the lower supporting rod are fixedly connected through the supporting column.
Optionally, the metal sliding rod is fixedly connected with the short connecting piece through a machine meter screw.
Optionally, the metal shorting seat includes a shorting support, a spring ball structure, a positioning hole and a fixing hole, and the spring ball structure includes the metal ball and a metal spring;
correspondingly, the short circuit support is fixedly connected with the fixed end through the positioning hole and the fixed hole.
Optionally, the limiting plate includes an upper limiting plate and a lower limiting plate;
the upper limiting plate and the lower limiting plate are fixedly connected with the connecting plate through pin nuts.
Optionally, the moving end and the fixed end of the breaker elastic plug component both include a current end and a voltage end;
and the current end is in insulated connection with the voltage end through an insulating plate.
Optionally, the current end and the voltage end are both connected to the insulating plate through a compression spring and a guide stud.
Optionally, the current terminal and the voltage terminal are made of copper alloy;
the insulating plate is made of bakelite.
Optionally, the moving end and the fixed end are in flexible connection through a copper foil.
According to the technical scheme, the embodiment of the application has the following advantages:
in this application, provide a high voltage circuit breaker electrical test anchor clamps, include: the circuit breaker comprises a circuit breaker elastic plug component, a metal elastic sliding rod component and a test clamp holding component; the number of the circuit breaker elastic plug components is 3, each circuit breaker elastic plug component comprises a moving end and a fixed end, the moving end is in flexible connection with the fixed end, and the 3 moving ends are respectively contacted with the inner walls of three-phase contact arms of the circuit breaker through elastic structures; the metal elastic sliding rod part comprises an insulation guide seat, a metal short connection seat, a metal sliding rod and a short connection piece arranged on the metal sliding rod, the metal sliding rod penetrates through the insulation guide seat in a sliding mode, two telescopic metal marbles are oppositely arranged inside the metal short connection seat, the diameter of the metal sliding rod is smaller than the distance between the two metal marbles, the outer diameter of the short connection piece is larger than the distance between the two metal marbles, and a sliding groove corresponding to the metal marbles is formed in the short connection piece; the test clamp holding component comprises a limiting plate and a connecting plate; the number of the insulating guide seats, the number of the metal short-circuit seats and the number of the short-circuit pieces are consistent with the number of the elastic plug parts of the circuit breaker; the insulating guide seat and the metal short connecting seat of the metal elastic sliding rod part are fixedly connected with the fixed end of the elastic plug part of the circuit breaker; pushing the metal slide bar to enable each short-circuit piece to be in contact with the metal marble, and realizing short circuit of the elastic plug parts of the 3 circuit breakers; and a connecting plate in the test clamp holding part is fixedly connected with the elastic plug part of the circuit breaker.
The application provides an electrical test fixture of high-voltage circuit breaker, through the direct inner wall contact that touches the arm with the circuit breaker of circuit breaker elasticity plug part, can reduce contact resistance's access, and the slip through the metal slide bar in the control metal elasticity slide bar part, make short connecting piece and metal marble contact, realize the short circuit of circuit breaker three-phase, need not carry out the secondary clamping of test pincers when carrying out interphase return circuit resistance test and three-phase whole ground circuit resistance test and handle, only need control metal slide bar, make short connecting piece and metal marble contact can, thereby unreliable adjustment action has been avoided, can not introduce great contact resistance. Therefore, the technical problem that the reliability of a test result is poor due to the fact that secondary clamping test pliers are needed when a loop resistance test is conducted in the prior test technology and the situation that a large contact resistance is accessed cannot be avoided can be solved.
Drawings
Fig. 1 is a schematic structural diagram of an electrical test fixture for a high-voltage circuit breaker according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of an elastic plug component of a circuit breaker according to an embodiment of the present disclosure;
FIG. 3 is a schematic structural diagram of a metal elastic sliding bar component according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of a metal shorting socket according to an embodiment of the present application;
FIG. 5 is a schematic structural diagram of a clamping member of a test forceps provided in an embodiment of the present application;
FIG. 6 is a schematic structural diagram of an insulating fixing bracket component according to an embodiment of the present application;
reference numerals:
1. a circuit breaker resilient plug member; 2. a metal elastic slide bar member; 3. a test jaw holding member; 4. an insulating fixed bracket member; 11. copper foil; 12. an insulating plate; 13. a current movement terminal; 14. a voltage moving terminal; 15. a current fixing end; 16 voltage fixed ends; 17. a compression spring; 18. a guide stud; 21. an insulating guide seat; 22. a metal shorting stub; 23. a metal slide bar; 24. a short connecting piece; 221. a short circuit support; 223. positioning holes; 224. a fixing hole; 2221. a metal marble; 2222. a metal spring; 32. a connecting plate; 311. an upper limiting plate; 312. a lower limiting plate; 41. an upper support rod; 42. a lower support bar; 43. and (4) a support column.
Detailed Description
In order to make the technical solutions of the present application better understood, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part 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.
For easy understanding, please refer to fig. 1, the present application provides an embodiment of an electrical test fixture for a high voltage circuit breaker, comprising: the circuit breaker comprises a circuit breaker elastic plug part 1, a metal elastic slide rod part 2 and a test clamp holding part 3;
the circuit breaker elasticity plug part 1 quantity is 3, and every circuit breaker elasticity plug part 1 all includes motion end and stiff end, motion end and stiff end soft joint, 3 motion ends all contact with the inner wall that the arm was touched to the circuit breaker three-phase respectively through elastic construction. In the prior art, in the loop resistance test process, when a current clamp and a voltage clamp are in contact with a plum blossom contact of a circuit breaker, the contact resistance of the plum blossom contact and a contact arm of the circuit breaker is introduced, and a plum blossom contact spring is burnt out due to poor contact; moreover, the number of the breaker elastic plug members 1 in the embodiment of the present application is 3, that is, there is one breaker elastic plug member 1 corresponding to each of the three-phase contact arms of the breaker. In the present embodiment, the moving end and the fixed end are flexibly connected through the copper foil 11, and other flexible connection structures may be selected, which are not limited herein.
The moving end and the fixed end of the elastic plug component 1 of the circuit breaker comprise a current end and a voltage end; the current terminal and the voltage terminal are connected in an insulated manner through an insulating plate 12, as shown in fig. 2. The circuit breaker elastic plug component 1 can be divided into a moving end and a fixed end according to the characteristics of the structure; the resistance test angle can be divided into a current end and a voltage end, and the moving end and the fixed end can be divided into a current end and a voltage end; according to the above division, the breaker elastic plug member 1 can divide the current moving terminal 13 and the voltage moving terminal 14, and the current fixing terminal 15 and the voltage fixing terminal 16. Current and voltage in the prior art adopt same root to touch and indicate, introduce unnecessary contact resistance easily, and this embodiment adopts insulating board 12 to keep apart current end and voltage end for the different positions contact of the same port of current clamp and voltage clamp and circuit breaker, can not exert an influence.
In addition, the current terminal and the voltage terminal are both connected with the insulating plate 12 through a compression spring 17 and a guide stud 18. Other connecting parts can be adopted as required, and the connecting part is reasonable and is not limited herein. In this embodiment, the current terminal and the voltage terminal are made of copper alloy; the insulating plate 12 is made of bakelite. The current terminal and the voltage terminal may also be made of other materials with good conductivity, which is not limited herein.
In addition, the fixed ends of the 3 breaker elastic plug components 1 are fixedly connected through an insulating fixed bracket component 4. The insulating fixed bracket part 4 includes an upper support rod 41, a lower support rod 42, and a support rod 43; the upper support rod 41 and the lower support rod 42 are fixedly connected by a support column 43. Please refer to fig. 6; furthermore, the support columns 43 may also be engraved with a machine vision recognition pattern. The upper support rod 41, the lower support rod 42 and the support column 43 in the insulating fixed bracket part 4 are all made of insulating materials.
The metal elastic sliding rod part 2 comprises an insulating guide seat 21, a metal short connection seat 22, a metal sliding rod 23 and a short connection piece 24 arranged on the metal sliding rod 23. Specifically, the metal slide rod 23 is slidably inserted into the insulating guide seat 21, the metal slide rod 23 can slide in the insulating guide seat 21, the insulating guide seat 21 mainly functions to support or hold the metal slide rod 23, and the insulating guide seat 21 can ensure that the metal slide rod 23 maintains good linearity in the movement process. Two telescopic metal marbles 2221 are oppositely arranged inside the metal short connecting seat 22, the diameter of the metal sliding rod 23 is smaller than the distance between the two metal marbles 2221, therefore, the metal sliding rod 23 is not directly contacted with the metal short connecting seat 22, the outer diameter of the short connecting piece 24 is larger than the distance between the two metal marbles 2221, a sliding groove corresponding to the metal marbles 2221 is arranged on the short connecting piece 24, and the short connecting piece can be contacted with the metal marbles 2221 under specific conditions, so that the metal sliding rod 23 and the metal short connecting seat 22 are in a connecting state. The number of the insulating guide seats 21, the number of the metal short-circuit seats 22 and the number of the short-circuit pieces 24 are the same as that of the elastic plug parts 1 of the circuit breaker, and are 3, and the metal sliding rods 23 can penetrate through the three insulating guide seats 21 and the metal short-circuit seats 22; the insulating guide seat 21 and the metal short-circuit seat 22 of the metal elastic sliding rod part 2 are fixedly connected with the fixed end of the elastic plug part 1 of the circuit breaker. The metal sliding rod 23 and the short-circuit member 24 are connected by a screw (not shown), please refer to fig. 3. The screw is used for fixedly sleeving the short connecting piece 24 on the metal sliding rod 23, and the short connecting piece 24 and the two metal marbles 2221 can be in a contact state or a non-contact state, namely a dislocation state, by controlling the sliding of the metal sliding rod 23.
In addition, the metal shorting seat 22 includes a shorting seat 221, a spring ball structure including a metal ball 2221 and a metal spring 2222, a positioning hole 223 and a fixing hole 224, please refer to fig. 4. Then, the shorting support 221 is fixedly connected to the fixing end through the positioning hole 223 and the fixing hole 224. It can be understood that the metal elastic slide bar part 2 and the breaker elastic plug part 1 are fixedly connected, and the connection parts are the short circuit support 221, the positioning hole 223 and the fixing hole 224 of the metal short circuit seat 22. The metal spring 2222 is fixedly connected with the metal marble 2221, and the metal marble 2221 presses the sliding groove on the short connecting piece 24 under the compression of the metal spring 2222; the spring ball structure obtained by combining the two can be tightly connected with the metal sliding rod 23.
When an interphase loop resistance test is carried out, when three-phase short circuit is not needed, the short-circuit piece 24 and the spring marble structure are staggered, and the diameter of the metal sliding rod 23 is smaller than the distance between the two metal marbles 2221, so that the metal sliding rod cannot contact the metal short-circuit seat 22; when carrying out the whole ground circuit resistance test of three-phase, when needing the three-phase short circuit, promote metal slide bar 23 and make each short connecting piece 24 and metal marble 2221 contact, realize 3 circuit breaker elasticity plug part 1's short circuit, and 3 circuit breaker elasticity plug part 1's motion end links to each other with the three-phase of circuit breaker respectively to the three-phase short circuit has been realized. The three-phase short circuit refers to the short circuit connection between three phases of the high-voltage circuit breaker in the whole three-phase grounding loop resistance test process.
The test clamp holding part 3 comprises a limiting plate and a connecting plate 32. Referring to fig. 5, the limiting plate includes an upper limiting plate 311 and a lower limiting plate 312; the upper limiting plate 311 and the lower limiting plate 312 are both fixedly connected with the connecting plate 32 through pin nuts. The test clamp clamping part 3 is designed by using the electric test clamp according to daily tests, the structure of the test clamp clamping part 3 is an I-shaped structure, the upper limiting plate and the lower limiting plate are used for positioning the electric test clamp, the electric test clamp can be fixed by clamping force of a clamp (not shown) arranged on a connecting plate 32 of the test clamp clamping part 3, and the clamp is fixedly connected with the connecting plate 32 and is in a conduction state. The connecting plate 32 in the clamping part 3 of the test clamp is fixedly connected with the elastic plug part 1 of the circuit breaker. The selected connecting parts can be clamping grooves and locking nuts, and can also be other fixing devices; it is understood that the connection plate 32 should be made of conductive material, and the connection plate 32 and the elastic plug member 1 of the circuit breaker are in a conductive state.
The application provides an electrical test fixture of high-voltage circuit breaker, through the direct inner wall contact that touches the arm with the circuit breaker of circuit breaker elasticity plug part, can reduce contact resistance's access, and the slip through the metal slide bar in the control metal elasticity slide bar part, make short connecting piece and metal marble contact, realize the short circuit of circuit breaker three-phase, need not carry out the secondary clamping of test pincers when carrying out interphase return circuit resistance test and three-phase whole ground circuit resistance test and handle, only need control metal slide bar, make short connecting piece and metal marble contact can, thereby unreliable adjustment action has been avoided, can not introduce great contact resistance. Therefore, the technical problem that the reliability of a test result is poor due to the fact that secondary clamping test pliers are needed when a loop resistance test is conducted in the prior test technology and the situation that a large contact resistance is accessed cannot be avoided can be solved.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
Based on such understanding, the technical solution of the present application may be substantially implemented or contributed to by the prior art, or all or part of the technical solution may be embodied in a software product, which is stored in a storage medium and includes instructions for executing all or part of the steps of the method described in the embodiments of the present application through a computer device (which may be a personal computer, a server, or a network device). And the aforementioned storage medium includes: a U disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (10)
1. The utility model provides an electric test fixture of high voltage circuit breaker, its characterized in that includes: the circuit breaker comprises a circuit breaker elastic plug component, a metal elastic sliding rod component and a test clamp holding component;
the number of the circuit breaker elastic plug components is 3, each circuit breaker elastic plug component comprises a moving end and a fixed end, the moving ends are in flexible connection with the fixed ends, and the 3 moving ends are respectively contacted with the inner walls of three-phase contact arms of the circuit breaker through elastic structures;
the metal elastic sliding rod part comprises an insulation guide seat, a metal short connection seat, a metal sliding rod and a short connection piece arranged on the metal sliding rod, the metal sliding rod penetrates through the insulation guide seat in a sliding mode, two telescopic metal marbles are arranged in the metal short connection seat in an opposite mode, the diameter of the metal sliding rod is smaller than the distance between the two metal marbles, the outer diameter of the short connection piece is larger than the distance between the two metal marbles, and a sliding groove corresponding to the metal marbles is formed in the short connection piece;
the test clamp holding component comprises a limiting plate and a connecting plate;
the number of the insulating guide seats, the number of the metal short connecting seats and the number of the short connecting pieces are consistent with the number of the elastic plug components of the circuit breaker;
the insulating guide seat and the metal short-circuit seat of the metal elastic sliding rod component are fixedly connected with the fixed end of the circuit breaker elastic plug component;
pushing the metal sliding rod to enable each short-circuit piece to be in contact with the metal marble, and achieving short circuit of 3 elastic plug components of the circuit breaker;
and a connecting plate in the test clamp holding part is fixedly connected with the elastic plug part of the circuit breaker.
2. The electrical test fixture for high-voltage circuit breakers as claimed in claim 1, wherein said fixed ends of 3 said resilient plug members of said circuit breakers are fixedly connected to each other by means of an insulating fixed bracket member.
3. The electrical test fixture of a high-voltage circuit breaker according to claim 2, wherein the insulating fixed bracket part comprises an upper support rod, a lower support rod and a support column;
the upper supporting rod and the lower supporting rod are fixedly connected through the supporting column.
4. The electrical test fixture for high-voltage circuit breakers according to claim 1, wherein said metal slide bar is fixedly connected to said shorting member by means of a screw.
5. The electrical test fixture for high-voltage circuit breakers of claim 1, wherein said metal shorting block comprises a shorting pedestal, a spring ball structure, a positioning hole and a fixing hole, and said spring ball structure comprises said metal ball and a metal spring;
correspondingly, the short circuit support is fixedly connected with the fixed end through the positioning hole and the fixed hole.
6. The electrical test fixture of a high-voltage circuit breaker according to claim 1, wherein the limiting plates comprise an upper limiting plate and a lower limiting plate;
the upper limiting plate and the lower limiting plate are fixedly connected with the connecting plate through pin nuts.
7. The electrical test fixture of a high voltage circuit breaker according to claim 1, wherein the moving end and the fixed end of the circuit breaker resilient plug member each comprise a current end and a voltage end;
and the current end is in insulated connection with the voltage end through an insulating plate.
8. The electrical test fixture for high-voltage circuit breakers of claim 7, wherein said current terminal and said voltage terminal are each connected to said insulating plate by a compression spring and a guide stud.
9. The electrical test fixture for high-voltage circuit breakers according to any one of claims 7 to 8, wherein the current terminal and the voltage terminal are made of copper alloy;
the insulating plate is made of bakelite.
10. The electrical test fixture for high-voltage circuit breakers of claim 1, wherein said moving end is flexibly connected to said fixed end by copper foil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110822085.1A CN113267654B (en) | 2021-07-21 | 2021-07-21 | Electrical test fixture for high-voltage circuit breaker |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110822085.1A CN113267654B (en) | 2021-07-21 | 2021-07-21 | Electrical test fixture for high-voltage circuit breaker |
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| CN113267654A true CN113267654A (en) | 2021-08-17 |
| CN113267654B CN113267654B (en) | 2021-09-24 |
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| CN115014941A (en) * | 2022-06-02 | 2022-09-06 | 广东嘉元科技股份有限公司 | Copper foil online detection method and device suitable for single-opening detection mechanism |
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