CN117810018B - A transverse magnetic field shielding structure and optimization method for multi-break vacuum circuit breaker - Google Patents
A transverse magnetic field shielding structure and optimization method for multi-break vacuum circuit breaker Download PDFInfo
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
- H01H33/66—Vacuum switches
- H01H33/662—Housings or protective screens
- H01H33/66261—Specific screen details, e.g. mounting, materials, multiple screens or specific electrical field considerations
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- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
- H01H33/66—Vacuum switches
- H01H33/664—Contacts; Arc-extinguishing means, e.g. arcing rings
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- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2111/00—Details relating to CAD techniques
- G06F2111/06—Multi-objective optimisation, e.g. Pareto optimisation using simulated annealing [SA], ant colony algorithms or genetic algorithms [GA]
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Abstract
The invention discloses a multi-fracture vacuum circuit breaker inter-circuit transverse magnetic field shielding structure and an optimization method, wherein the shielding structure comprises a plurality of shielding units which are symmetrically arranged around an arc extinguishing chamber and are used for shielding transverse magnetic fields generated by adjacent circuits; each shielding unit includes: an arc-shaped iron core arranged outside the arc-extinguishing chamber, and two block-shaped iron cores respectively arranged at the left side and the right side of the arc-extinguishing chamber; the arc iron core is not directly connected with the blocky iron core; the arc-shaped iron core is used for improving the symmetry of the magnetic field in the diameter direction of the arc section; the blocky iron core is used for improving the uniformity of the magnetic field of the arc section along the arc direction. Compared with the existing magnetic shielding structure, the iron core provided by the invention can be independently and flexibly adjusted and is not easy to saturate, and meanwhile, the size optimization can be performed by combining an intelligent algorithm, so that the optimal magnetic shielding effect is obtained.
Description
Technical Field
The invention belongs to the technical field of circuit breakers, and particularly relates to a multi-fracture vacuum circuit breaker inter-circuit transverse magnetic field shielding structure based on a BP (Back Propagation) neural network and an NSGA-II (Multi-target genetic Algorithm).
Background
The transverse magnetic field generated by the adjacent paths of the multi-fracture breaker can have a significant effect on the magnetic field distribution among the contacts of the circuit, as shown in fig. 1 and 2, 11 represents a first adjacent path, 12 represents a second adjacent path, 21 represents an arc, 22 represents an arc section, and 23 represents a contact; the transverse magnetic field can cause the electric arc to gather to one side, so that the ablation degree is increased, and meanwhile, the concentration of plasma at the moment of current zero crossing point is increased, so that the switching-on and switching-off performance of the circuit is affected.
In order to shield the transverse magnetic field generated by the adjacent path, the measures adopted at present are mainly divided into two types: (1) The distance between the multiple-break breaker paths is increased, so that the strength of a transverse magnetic field generated by the adjacent paths is weakened. (2) A conventional cylindrical shield structure is fitted over the outside of each arc extinguishing chamber, as shown in fig. 3, 31 denotes a conventional cylindrical shield (slot), and 32 denotes a contact arc model.
For the large-current multi-fracture vacuum circuit breaker of the generator, the current value of each path is larger, particularly, the maximum peak value of a single-path current during short circuit can reach 114kA, the effect of weakening a magnetic field only by increasing the distance between paths is limited, and meanwhile, the self structure of the multi-fracture vacuum circuit breaker can be increased, so that the economic cost and the occupied space are increased.
Because each path of current is larger, if the traditional cylindrical shielding cover structure is adopted for magnetic field shielding, the phenomenon of magnetic saturation is easy to occur, and the shielding effect of the ferromagnetic material is lost.
Therefore, in order to shield the transverse magnetic field generated by the adjacent paths of the multi-break circuit breaker, a new shielding structure needs to be designed.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a multi-fracture vacuum circuit breaker inter-circuit transverse magnetic field shielding structure based on BP and NSGA-II, and aims to solve the problem that a ferromagnetic material loses a shielding effect due to the fact that a cylindrical shielding cover structure is adopted for magnetic field shielding in the prior art.
The invention provides a multi-fracture vacuum circuit breaker inter-circuit transverse magnetic field shielding structure, which comprises a plurality of shielding units which are symmetrically arranged around an arc extinguishing chamber and are used for shielding transverse magnetic fields generated by adjacent circuits; each shielding unit includes: an arc-shaped iron core arranged outside the arc-extinguishing chamber, and two block-shaped iron cores respectively arranged at the left side and the right side of the arc-extinguishing chamber; the arc iron core is not directly connected with the blocky iron core; the arc-shaped iron core is used for improving the symmetry of the magnetic field in the diameter direction of the arc section; the blocky iron core is used for improving the uniformity of the magnetic field of the arc section along the arc direction.
Still further, a contact arc model disposed within the arc chute is included.
Furthermore, the size and the position of the shielding unit under the optimal shielding effect are obtained by establishing a double-target optimization model of the distribution of the arc magnetic field between the contacts in the contact arc model.
Still further, the dual-objective optimization model includes an optimization objective one and an optimization objective two; the first optimization target is asymmetry sigma 1 of the magnetic field in the diameter direction of the arc section; the second optimization target is the non-uniformity sigma 2 of the magnetic field of the arc interface along the arc direction.
Further, regression fitting is carried out on the first optimization target and the second optimization target respectively by adopting the BP neural network.
Further, the ferromagnetic material used for the shielding unit is soft iron.
The invention provides an optimization method based on the transverse magnetic field shielding structure, which comprises the following steps:
S1: establishing a finite element simulation model aiming at the multi-fracture generator;
S2: establishing a characterization model of a magnetic field shielding optimization effect according to the finite element simulation model, and performing regression fitting on the first optimization target and the second optimization target by adopting a BP neural network to obtain a functional relation between shielding structure parameters and the two optimization targets;
The characterization model represents the asymmetry of the magnetic field distribution along the diameter direction and the non-uniformity of the magnetic field distribution along the circular arc direction, and the two optimization targets are the output layer of the neural network and the optimization target of the NSGA-II algorithm.
S3: and embedding the neural networks BP1 and BP2 into an NSGA-II optimization algorithm, and selecting an optimal solution when the weight of the first optimization target is equal to that of the second optimization target, so as to obtain an optimal magnetic shielding structure.
Further, the first optimization target is the asymmetry sigma 1 of the magnetic field in the diameter direction of the arc section; the second optimization target is the non-uniformity sigma 2 of the magnetic field of the arc interface along the arc direction.
Further, the step S3 specifically includes:
embedding BP1 and BP2 into NSGA-II algorithm in the form of function, iterating the size and position values of arc iron core and block iron core, and obtaining Pareto solution set by adopting non-dominant sorting technology;
when the weights of the first optimization target and the second optimization target are equal, the optimal solution in the pareto solution set is:
The optimal target value under the optimal size is as follows:
Through the technical scheme of the invention, compared with the existing magnetic shielding structure, the shielding unit provided by the invention comprises an arc-shaped iron core arranged on the outer side of the arc-extinguishing chamber and two block-shaped iron cores respectively arranged on the left side and the right side of the arc-extinguishing chamber; the arc iron core is not directly connected with the blocky iron core; the arc-shaped iron core is used for improving the symmetry of the magnetic field in the diameter direction of the arc section; the block-shaped iron core is used for improving the uniformity of a magnetic field of the arc section along the arc direction; the iron core in the invention can be independently and flexibly adjusted and is not easy to saturate, and meanwhile, the size optimization can be carried out by combining an intelligent algorithm, so that the optimal magnetic field shielding optimization effect under the structure is obtained.
Drawings
FIG. 1 is a schematic diagram of the generation of an adjacent-path transverse magnetic field in the prior art;
FIG. 2 is a schematic diagram showing the influence of an adjacent-path transverse magnetic field on the original transverse magnetic field distribution of the path in the prior art;
FIG. 3 is a schematic view of a conventional cylindrical magnetic shield structure in the prior art;
FIG. 4 is a schematic diagram of the magnetic field distribution of an arc interface under influence of a neighboring transverse magnetic field provided by an embodiment of the present invention;
Fig. 5 is a schematic diagram of a transverse magnetic field shielding structure between multiple-break vacuum circuit breakers based on BP and NSGA-ii provided by the embodiment of the invention; wherein, (a) represents a six-way parallel vacuum circuit breaker magnetic shielding structure; (b) represents a four-way parallel vacuum circuit breaker magnetic shielding structure; (c) representing a three-way parallel vacuum circuit breaker magnetic shielding structure;
FIG. 6 is a graph of the magnetic field observation points of an arc cross section provided by an embodiment of the present invention;
FIG. 7 is a schematic dimensional view of a shielding structure according to an embodiment of the present invention;
FIG. 8 is a block diagram of a neural network model provided by an embodiment of the present invention;
Fig. 9 is a schematic structural diagram of a six-port circuit breaker and a shielding device thereof according to an embodiment of the present invention;
FIG. 10 is a B-H plot of soft iron provided by an embodiment of the present invention;
FIG. 11 (a) is an unshielded magnetic field pattern provided by an embodiment of the present invention, (b) is a cylindrical shielding magnetic field pattern provided by the prior art, and (c) is a magnetic field pattern of an inter-circuit transverse magnetic field shielding structure of a multi-circuit breaker based on BP and NSGA-II provided by an embodiment of the present invention;
Fig. 12 (a) shows magnetic field distribution diagrams in the arc cross-section diameter direction in different cases provided by the embodiment of the present invention, and (b) shows magnetic field distribution diagrams in the arc cross-section arc direction in different cases provided by the embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The invention utilizes the small magnetic resistance of the iron core material to change the characteristic of the magnetic circuit, reasonably arranges the iron cores, and realizes the effects of magnetic shielding and improving the magnetic field distribution. Distinction from the prior art: compared with the traditional cylindrical shielding case, the novel shielding structure composed of three iron cores is provided, and the optimization algorithm is combined for size optimization. The technical advantages are that: the shielding effect is obviously superior to that of the traditional cylindrical iron core, the three iron cores are independent and are not easy to saturate, and meanwhile, the precise size of the shielding structure under the optimal shielding effect is obtained by utilizing an optimization algorithm.
FIG. 4 shows a magnetic field distribution of an arc interface under influence of an adjacent path transverse magnetic field provided by an embodiment of the present invention; as can be seen from fig. 4, the magnetic field at the left side of the arc section is larger, so that an arc-shaped iron core can be added at the left side of the arc extinguishing chamber, the original magnetic circuit at the side can be changed, the transverse magnetic field intensity of the arc extinguishing chamber between contacts at the side can be reduced, and the minimum point of the magnetic field can be moved back towards the center direction of the arc section.
In order to weaken the magnetic field intensity in the lower left and upper left regions of the arc section, according to the previous thought, block-shaped iron cores are arranged at the upper left and lower left outer sides of the arc section (fig. 4), and the magnetic field distribution is made to be as uniform and symmetrical as possible by adjusting the size and the position.
FIG. 5 shows a multi-break vacuum circuit breaker inter-circuit transverse magnetic field shielding structure based on BP and NSGA-II provided by an embodiment of the invention; wherein, (a) represents a six-way parallel vacuum circuit breaker magnetic shielding structure; (b) represents a four-way parallel vacuum circuit breaker magnetic shielding structure; (c) represents a three-way parallel vacuum interrupter magnetic shielding structure.
In order to shield the transverse magnetic field generated by the adjacent paths of the multi-fracture breaker, the invention provides a multi-fracture vacuum breaker inter-path transverse magnetic field shielding structure based on BP and NSGA-II, which comprises a plurality of shielding units symmetrically arranged around an arc extinguishing chamber and used for shielding the transverse magnetic field generated by the adjacent paths; characterized in that each shielding unit comprises: an arc-shaped iron core 51 arranged outside the arc extinguishing chamber, and two block-shaped iron cores 53 respectively arranged at the left side and the right side of the arc extinguishing chamber; the arc-shaped iron core 51 and the block-shaped iron core 53 are not directly connected; the arc-shaped iron core 51 is used for improving the symmetry of the magnetic field in the diameter direction of the arc section; the block-shaped iron core 53 serves to improve the uniformity of the magnetic field of the arc section in the arc direction.
The invention also includes a contact arc model 52 disposed within the arc chute.
The transverse magnetic field shielding structure provided by the invention can effectively shield the transverse magnetic field generated by the adjacent path and prevent the iron core from being saturated.
The working principle of the transverse magnetic field shielding structure provided by the invention is as follows: when no shielding device is added, the outer side and the two sides of the arc-extinguishing chamber are provided with stronger transverse magnetic fields, so that the overall transverse magnetic fields are unevenly distributed, then, the iron cores are arranged on the outer side and the two sides of the arc-extinguishing chamber, the magnetic resistance of the iron cores is far smaller than that of air, more magnetic circuits can flow through the iron cores, the effect of absorbing the strong magnetic fields on the outer side and the two sides of the arc-extinguishing chamber is achieved, the overall magnetic field distribution is more uniform, three iron cores are not directly connected, and the magnetic resistance is far larger than that of the three iron cores and is directly connected, so that the iron cores of the structure are not easy to saturate.
Because the sizes and the positions of the arc-shaped iron cores 51 and the block-shaped iron cores 53 have influence on the distribution of the transverse magnetic field between the contacts, the variables are more, and the optimal magnetic field distribution is difficult to obtain through manual adjustment; therefore, the size and position of the shielding structure under the optimal shielding effect are obtained by fitting the size, position, magnetic field distribution uniformity and symmetry indexes of the shielding structure by utilizing the BP neural network, and then embedding the fitted neural network into an NSGA-II optimization algorithm for size optimization.
Specifically, the invention establishes an NSGA-II double-target optimization model.
As shown in fig. 6, the transverse magnetic induction intensity of 17 positions of the arc section is recorded, and a double-target optimization model of the arc magnetic field distribution between contacts is established by using the data of 17 observation points. The first optimization target in the double-target optimization model is the asymmetry sigma 1 of the magnetic field in the diameter direction of the arc section: The second optimization target is the non-uniformity sigma 2 of the magnetic field of the arc interface along the arc direction: wherein B i is the transverse magnetic size of the ith observation point.
Because the calculation cost of finite element simulation is high, a neural network model needs to be established first, and the fitting relation between the first and second optimization targets and the sizes and positions of the arc-shaped iron cores and the block-shaped iron cores is obtained.
Model input quantity: the specific meanings of parameters including thickness 71 of the arc-shaped iron core, distance 72 of the arc-shaped iron core from the center of the contact, arc-shaped iron core radian 73, block-shaped iron core height 74, block-shaped iron core width 75, block-shaped iron core position (x direction) 76, block-shaped iron core position (y direction) 77 and block-shaped iron core deflection angle 78 are shown in fig. 7.
And embedding the trained neural network model into an NSGA-II double-target optimization model to perform size optimization of the shielding structure.
Under the condition of high current, the traditional ferromagnetic shielding cylinder is easy to magnetically saturate and lose shielding capacity, and the shielding effect is very small, so that the ferromagnetic shielding cylinder is not applicable any more. The magnetic shielding structure provided by the invention is not easy to saturate, the corresponding precise size and precise position of the shielding cover under the optimal shielding effect are obtained through an intelligent algorithm, and finally, the transverse magnetic field distribution among the contacts is obviously more uniform and symmetrical relative to the non-shielded or traditional cylindrical shielding, so that the transverse magnetic field generated by the adjacent paths of the multi-port circuit breaker is effectively weakened, and the opening and closing of the vacuum circuit breaker are facilitated.
The invention also provides an optimization method based on the transverse magnetic field shielding structure, which comprises the following steps:
S1: establishing a finite element simulation model aiming at the multi-fracture generator:
Vacuum interrupter part: the 6 equivalent arc-extinguishing chambers are arranged in a hexagon, the diameter of each contact (arc diameter) is 12cm, the distance between every two adjacent arc-extinguishing chambers is 68cm, and the model only researches the influence of a transverse magnetic field generated by adjacent current on the transverse magnetic field distribution among the contacts, so that 6 cylinders with the diameter of 12cm and the height of 60cm are used for equivalence, and 80.6kA current (short-circuit current effective value) is respectively introduced into the 6 cylinders.
Magnetic shielding structural part: the XOY section of the arc-shaped iron core 51 is a 6-segment ring with the hexagonal centroid of the arc-extinguishing chamber array as the center of a circle, and each segment of the XOY section of the arc-shaped iron core is axisymmetric with respect to a straight line passing through the hexagonal centroid of the arc-extinguishing chamber and the center of the arc-extinguishing chamber. The thickness, the position and the radian of the arc-shaped iron core are adjustable. The block-shaped iron cores 53 are cube structures symmetrically distributed on two sides of the arc extinguishing chamber, and the size, the position and the deflection angle of the block-shaped iron cores are adjustable. The ferromagnetic material used for the magnetic shielding structure is Soft Iron.
Air domain: a cylinder with a diameter of 200cm and a height of 60 cm.
S2: establishing a BP neural network model:
firstly, establishing a characterization model of a magnetic field shielding optimization effect; regression fitting is performed on the first optimization target and the second optimization target respectively by using a BP neural network, as shown in fig. 8.
After the neural network is used for parameter adjustment, the prediction error is as follows:
the RMSE of BP1 and BP2 is smaller than 1/100, so that the two neural network models have higher prediction accuracy.
BP1 and BP2 are embedded into NSGA-II algorithm in the form of function, the size and position values of arc iron core and block iron core are iterated, and Pareto solution set is obtained by adopting non-dominant sorting technology. If the weights of the first optimization target and the second optimization target are equal, the optimal solution in the pareto solution set is:
The optimal target value under the optimal size is as follows:
s3: NSGA-ii dual objective optimization:
Embedding the neural networks BP1 and BP2 into an NSGA-II optimization algorithm, and optimizing individual coefficients: 0.3; population size: 200; maximum evolution algebra: 300; stopping algebra: 200; fitness function bias: 1e-10; and obtaining 60 groups of Pareto solutions, and when the weights of the first target and the second target are equal, selecting an optimal solution to obtain an optimal magnetic shielding structure.
The embodiment of the invention further comprises S4: checking the shielding optimization effect: from (b), (c) in fig. 11 and (a) in fig. 12, it can be intuitively found that: the magnetic field distribution under the new shielding structure is obviously more uniform and symmetrical relative to the non-shielding and traditional cylindrical shielding, and the influence of the adjacent-path transverse magnetism on the switching-on and switching-off characteristics of the circuit is effectively avoided. As is clear from fig. 12 (a) and (b), the symmetry of the arc cross-section magnetic field distribution in the arc diameter direction and the uniformity in the arc direction are significantly higher in the novel shielding structure with respect to the cylindrical shield and the non-shield, and are very similar to the magnetic field distribution without the influence of the neighboring lateral magnetic field (ideal case).
It will be readily appreciated by those skilled in the art that the foregoing description is merely a preferred embodiment of the invention and is not intended to limit the invention, but any modifications, equivalents, improvements or alternatives falling within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (6)
1. A multi-fracture vacuum circuit breaker inter-circuit transverse magnetic field shielding structure comprises a plurality of shielding units which are symmetrically arranged around an arc extinguishing chamber and used for shielding transverse magnetic fields generated by adjacent paths; characterized in that each shielding unit comprises: an arc-shaped iron core (51) arranged outside the arc extinguishing chamber, and two block-shaped iron cores (53) respectively arranged at the left side and the right side of the arc extinguishing chamber; the arc-shaped iron core (51) is not directly connected with the block-shaped iron core (53);
The arc-shaped iron core (51) is used for improving the symmetry of a magnetic field in the diameter direction of the arc section;
The block-shaped iron core (53) is used for improving the uniformity of a magnetic field of the arc section along the arc direction;
The optimized magnetic field shielding structure is obtained by establishing a finite element simulation model aiming at a multi-fracture vacuum circuit breaker, establishing a characterization model of a magnetic field shielding optimization effect according to the finite element simulation model, respectively carrying out regression fitting on an optimization target I and an optimization target II by adopting a BP neural network to obtain a functional relation between shielding structure parameters and the two optimization targets, embedding the neural networks BP1 and BP2 into an NSGA-II optimization algorithm, and selecting an optimal solution when the weight of the optimization target I and the weight of the optimization target II are equal;
the first optimization target is asymmetry of the magnetic field in the diameter direction of the arc section ; The second optimization target is the non-uniformity of the magnetic field of the arc interface along the arc direction。
2. The transverse magnetic field shielding structure according to claim 1, further comprising a contact arc model (52) disposed within the arc chute.
3. The transverse magnetic field shielding structure according to claim 2, characterized in that the size and position of the shielding element under optimal shielding effect is obtained by establishing a double-objective optimization model of the distribution of the arc magnetic field between the contacts in the contact arc model (52).
4. A transverse magnetic field shielding structure according to any of claims 1-3, characterized in that the ferromagnetic material used for the shielding element is soft iron.
5. A method of optimizing a transverse magnetic field shielding structure according to any of claims 1-4, comprising the steps of:
s1: establishing a finite element simulation model aiming at the multi-fracture vacuum circuit breaker;
S2: establishing a characterization model of a magnetic field shielding optimization effect according to the finite element simulation model, and performing regression fitting on the first optimization target and the second optimization target by adopting a BP neural network to obtain a functional relation between shielding structure parameters and the two optimization targets;
s3: and embedding the neural networks BP1 and BP2 into an NSGA-II optimization algorithm, and selecting an optimal solution when the weight of the first optimization target is equal to that of the second optimization target, so as to obtain an optimal magnetic shielding structure.
6. The optimization method according to claim 5, wherein step S3 specifically includes:
embedding BP1 and BP2 into NSGA-II algorithm in the form of function, iterating the size and position values of arc iron core and block iron core, and obtaining Pareto solution set by adopting non-dominant sorting technology;
when the weights of the first optimization objective and the second optimization objective are equal, the structure variables of the optimal solution in the pareto solution set include: the thickness of the arc-shaped iron core, the distance between the arc-shaped iron core and the center of a contact, the radian of the arc-shaped iron core, the height of the block-shaped iron core, the width of the block-shaped iron core, the x direction of the position of the block-shaped iron core, the y direction of the position of the block-shaped iron core and the deflection angle of the block-shaped iron core;
wherein, the optimal size of the thickness of the arc-shaped iron core is 11.00cm;
The optimal size of the distance between the arc iron core and the center of the contact is 10.2cm;
The optimal size of the arc iron core radian is 40.15 degrees;
the optimal size of the height of the block-shaped iron core is 12.00cm;
the optimal size of the width of the block-shaped iron core is 4.00cm;
The optimal size of the block-shaped iron core in the x direction is 9.27cm;
the optimal size of the block-shaped iron core in the y direction is 29.60cm;
the optimum size of the offset angle of the block-shaped iron core is 4.90 degrees;
Optimizing target values at optimal dimensions Is 0.0215 part of the total weight of the product,0.00224.
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| CN202311743413.4A CN117810018B (en) | 2023-12-15 | 2023-12-15 | A transverse magnetic field shielding structure and optimization method for multi-break vacuum circuit breaker |
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| CN202311743413.4A CN117810018B (en) | 2023-12-15 | 2023-12-15 | A transverse magnetic field shielding structure and optimization method for multi-break vacuum circuit breaker |
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| CN117810018A CN117810018A (en) | 2024-04-02 |
| CN117810018B true CN117810018B (en) | 2024-11-19 |
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| CN202311743413.4A Active CN117810018B (en) | 2023-12-15 | 2023-12-15 | A transverse magnetic field shielding structure and optimization method for multi-break vacuum circuit breaker |
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| DE102012222328B4 (en) * | 2012-12-05 | 2021-06-02 | Siemens Aktiengesellschaft | Switching device |
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| CN88100292A (en) * | 1987-01-19 | 1988-08-03 | 梅兰日兰公司 | The multi-phase circuit breaker of gas-insulated metal cell switch cubicle |
| CN116884803A (en) * | 2023-06-20 | 2023-10-13 | 四川大学 | A vacuum arc extinguishing chamber |
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