CN113078576B - 10kV high-voltage switch cabinet safety performance improving method - Google Patents
10kV high-voltage switch cabinet safety performance improving method Download PDFInfo
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- CN113078576B CN113078576B CN202110359133.8A CN202110359133A CN113078576B CN 113078576 B CN113078576 B CN 113078576B CN 202110359133 A CN202110359133 A CN 202110359133A CN 113078576 B CN113078576 B CN 113078576B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B13/00—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle
- H02B13/02—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle with metal casing
- H02B13/025—Safety arrangements, e.g. in case of excessive pressure or fire due to electrical defect
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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Abstract
The application discloses an explosion-proof safety design lifting method of a 10kV high-voltage switch cabinet, which comprises the following steps: aiming at the internal short circuit arc impact process, a safety margin value of each isolation cabin of the switch cabinet is calculated based on a multi-physical field coupling finite element calculation method, and aiming at the weak part of the safety margin, the impact force applied to the weak part in the short circuit arc process is relaxed and balanced by a method of covering the inner side of the weak part with a high polymer composite refractory material, so that the safety margin of the weak part is improved, the overall safety level of the isolation cabin is further improved, and method guidance is provided for the safety design of the 10kV high-voltage switch cabinet. The application can further improve the operation safety of the switch cabinet based on the explosion-proof design of the existing switch cabinet.
Description
Technical Field
The application relates to the field of explosion protection of 10kV high-voltage switch cabinets, in particular to an explosion protection safety performance improving method caused by internal short-circuit electric arcs.
Background
Along with the rapid development of the power distribution network of the power system, stable and reliable electric energy supply is continuously pursued for the power distribution network, and the 10kV high-voltage switch cabinet is widely used in the power distribution network due to the characteristics of reliable operation, convenient operation and the like. However, the internal short circuit arc fault of the 10kV switch cabinet is easy to occur due to the problems of improper operation or defects of manufacturing process of factories, and the like, so that explosion accidents are caused.
In order to reduce secondary injury caused by explosion accidents caused by short-circuit arc accidents, the switch cabinets are mostly designed to be separated cabins, and each independent cabin is provided with an independent energy discharging channel. GB3906-2006 regards the internal short-circuit arc burning test of the 10kV switch cabinet as a mandatory test, so that whether the safety performance of the switch cabinet meets the standards is checked.
Although the 10kV switch cabinet has matched safety design and test standards, secondary injury accidents caused by explosion of the switch cabinet still occur. According to statistics, only handcart type switch cabinets are used, so that the number of the switch cabinets is up to 200 more than 200 per year due to short-circuit arc burning, and most of the switch cabinets cause cabinet body breakage or cabinet door flushing. It can be seen that the explosion accident caused by the short circuit arc fault inside the 10kV switch cabinet is still not negligible.
At present, the safety level of each isolation cabin of the switch cabinet is improved mainly through the optimization design of the cabinet body, the cabinet door and the pressure relief channel. However, the explosion shock waves generated in the process of short-circuit arc impact inside the switch cabinet are unevenly distributed in the switch cabinet, the internal structure of the switch cabinet is inconsistent, and weak parts with weak impact resistance performance are necessarily present. The safety index of the whole isolation cabin is determined by the safety index of the weakest part of the isolation cabin. Therefore, to improve the overall safety performance of the switch cabinet, the key is to find out the weak link of the safety withstanding performance of the switch cabinet and take measures in a targeted way to enable the safety withstanding performance to reach the safety level matched with other parts of the whole switch cabinet.
Based on the existing explosion-proof design of the actual switch cabinet (pressure release plates are respectively added to the isolation cabins), the safety margin value of each isolation cabin of the switch cabinet is calculated based on a multi-physical-field-coupling finite element calculation method, and aiming at the weak part of the safety margin, the impact force applied to the weak part in the short-circuit arc process is relaxed and balanced by a method of covering the weak part with a polymer composite refractory material on the inner side of the weak part, so that the safety margin of the weak part is improved, and the overall safety level of the isolation cabin is further improved. The method guidance is provided for improving the safety performance of the 10kV switch cabinet.
Disclosure of Invention
The application provides an explosion-proof safety design lifting method aiming at a 10kV high-voltage switch cabinet, which is used for solving the technical problems of casualties and equipment damage of surrounding personnel when internal short circuit arc explosion occurs due to imperfect theory and method of safety design of the 10kV high-voltage switch cabinet.
In order to solve the technical problems, the technical scheme provided by the application is as follows:
based on the existing explosion-proof design of the actual switch cabinet (pressure release plates are respectively added to the isolation cabins), the safety margin value of each isolation cabin of the switch cabinet is calculated based on a multi-physical field coupling finite element calculation method aiming at the internal short circuit arc impact process of the switch cabinet, and the impact force applied to the weak part in the short circuit arc process is relaxed and balanced by a method of covering the weak part of the safety margin and the inner side of the safety margin by a high polymer composite refractory material, so that the safety margin of the weak part is improved, and the overall safety level of the isolation cabin is further improved.
The design method for improving the explosion-proof safety performance of the 10kV high-voltage switch cabinet comprises the following steps of:
1. the safety margin determining method for each isolation cabin of the switch cabinet comprises the following steps:
in the continuous process of short-circuit arc explosion, when the pressure release plate does not act, the isolation cabin can be regarded as a closed environment. The arc energy can be rapidly diffused, so that the ambient temperature is suddenly increased, the pressure in the isolation cabin is suddenly increased, and under the continuous action of the pressure difference between the inside and the outside, the cabinet body is torn or the cabinet door of the isolation cabin is flushed, thereby seriously threatening the life safety of surrounding staff and the normal operation of equipment. Therefore, the key of the safety margin calculation of the isolated cabin is that the safety margin values of the cabinet body and the cabinet door are used as the safety margin of the whole cabin by taking the smaller safety margin values of the cabinet body and the cabinet door 2, and the safety margin calculation method comprises the following steps:
(1) Determining the action time t of the post-explosion energy release plate max . Calculating the time-dependent functional relation of stress at the nylon rivet of the pressure release plate of the upper cover plate of the cable chamber after the cable chamber is generated from the occurrence of short circuit arc, and obtaining the action time t of the pressure release plate by taking the limit fracture stress of the nylon rivet as the basis max 。
(2) And (5) calculating the safety margin of the cabinet body (cabinet door). Calculating stress sigma born by a cabinet body (cabinet door) after short circuit arc is generated g (or pressure P) g ) Graph of maximum point change with time to obtain t max Sigma corresponding to time g (or P) g ) The method comprises the steps of carrying out a first treatment on the surface of the Ultimate breaking stress sigma bearable by cabinet body (or cabinet door) material j (or pressure P) j ). The safety margin of the cabinet body (or cabinet door) is calculated by the formula (1).
(3) And determining the safety margin of the isolation cabin of the switch cabinet. And comparing the safety margin values of the cabinet body and the cabinet door, and taking the smaller value as the safety margin value K of the cabin.
2. And (3) selecting a covering high polymer material:
the impact resistance performance is influenced by the material characteristics, and the operation condition requirement of the switch cabinet is considered, so that the selected high polymer covering material meets the following conditions: (1) has higher Young's modulus and Poisson's ratio; (2) has fireproof and flame-retardant properties; and (3) the cost is low and the processing is easy.
3. Polymer material covering method
The application adopts the method that the inner side of the isolation cabin is covered with a certain thickness of selected polymer material. In order to not influence subsequent operation and maintenance and achieve the optimal covering effect, the covering area and the thickness of the material should be optimally designed.
(1) The coverage area is determined according to the following principle: covering is carried out in a concentrated area of larger stress (or pressure) born by the cabinet body (or the cabinet door). The method for determining the material coverage area is as follows:
1) Finding out the action time t of the pressure relief plate through simulation calculation max And in the time period, the areas with larger stress (or pressure) on the cabinet body (or the cabinet door) at different moments are marked.
2) Selecting stress sigma of cabinet body (or cabinet door) at different moments g (or pressure P) g ) The union of the positions of the larger areas is used as the coverage area of the polymer material, and the coverage area schematic diagram FIG is drawn x 。
3) The thickness of the covering material is selected as follows:
the thicker the covered high polymer material is, the smaller the impact force is received by the cabinet body (or cabinet door) under the same condition, but the thicker the high polymer material is, the thicker the high polymer material is, but the high polymer material is not suitable for the practical application scene. The principle of determining the thickness of the covering layer is as follows: the impact force is balanced through the selection of the thickness, and the safety margin value K of the cabinet body (or cabinet door) is ensured σ ≥K P Or (K) σ ≤K P ). The method comprises the following steps:
1) Selecting polymer material pairs with different thicknesses x Covering the marked areas, and respectively calculating the action time t of the pressure relief plate max Stress sigma applied to cabinet body (or cabinet door) g (or pressure P) g )。
2) And drawing a relation chart of the maximum pressure of the cabinet door along with the thickness of the covering layer.
3) Calculating the safety margin value of the cabinet door under different covering thicknesses, and when K σ ≥K P Or (K) σ ≤K P ) And if the thickness d meets the requirement, determining the required thickness d of the covering layer.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:
FIG. 1 is a graph of stress at nylon rivets of a pressure relief plate of a cable chamber over time in accordance with a preferred embodiment of the present application;
FIG. 2 is a graph showing the distribution of stress maximum points of a cable chamber cabinet according to a preferred embodiment of the present application;
FIG. 3 is a graph of the maximum point of stress of a cable chamber cabinet over time in accordance with a preferred embodiment of the present application;
FIG. 4 is a graph showing the distribution of the maximum points of pressure applied to a cable chamber door in accordance with a preferred embodiment of the present application;
FIG. 5 is a graph showing the maximum point of pressure applied to a cable chamber door as a function of time in accordance with a preferred embodiment of the present application;
FIG. 6 is a graph showing the distribution of large areas of pressure at different times in the cable chamber door in accordance with the preferred embodiment of the present application;
FIG. 7 is a schematic view of the cable closet door coverage area of a preferred embodiment of the present application;
FIG. 8 is a schematic view of the cable chamber door of the preferred embodiment of the present application after being covered;
FIG. 9 is a pressure distribution diagram of a cable chamber door covered with a 5mm thick polymeric material in accordance with a preferred embodiment of the present application;
FIG. 10 is a graph showing the pressure applied to a cable chamber door according to a preferred embodiment of the present application as a function of the thickness of the covering material;
the reference numerals in the drawings denote:
1. nylon rivets 2; 2. nylon rivet 1; 3. nylon rivet fracture stress reference line; 4. the maximum stress point of the cabinet body; 5. the maximum point of the cabinet door pressure; 6. the cabinet door pressure is larger at the moment of t=6.5 ms; 7. the cabinet door pressure is larger at the moment of t=8.5 ms; 8. the cabinet door pressure is larger at the moment of t=10.5ms; 9. the high polymer material coverage area of the cabinet door; 10. a pressure relief plate; 11. the joint of the bus chamber inclined partition board; 12. a heat source; 13. a polymer material coverage area; 14. and covering the maximum pressure point of the cabinet door after the high polymer material with the thickness of 5 mm.
Detailed Description
The following describes embodiments of the application in detail, but the application may be practiced in a variety of different ways, as defined and covered by the claims.
The method provided by the embodiment is based on the existing explosion-proof design of the actual switch cabinet (pressure release plates are respectively added to the isolation cabins), calculates the safety margin value of each isolation cabin of the switch cabinet based on a multi-physical field coupling finite element calculation method aiming at the internal short circuit arc impact process of the switch cabinet, and eases and balances the impact force applied to a cabinet door in the short circuit arc process by covering the inner side of the safety margin weak part with a high polymer composite refractory material aiming at the safety margin weak part, so that the safety margin of the weak part is improved, and the safety level of the whole isolation cabin is improved.
In this embodiment, taking the actual size of the cable chamber of the KYN28-12 type switch cabinet as an example, the simulation modeling and safety design lifting method of the other two high-voltage chambers (bus chamber and breaker chamber) is the same as the simulation modeling and safety design lifting method, and the specific steps when the method is executed are as follows:
1. and (3) determining and calculating the safety margin of the cable chamber of the switch cabinet:
and (3) obtaining a stress time-dependent change chart of the position of the nylon rivet of the pressure release plate through three-layer iteration of finite elements (the nylon rivets 1 and 3 are symmetrical in position and have consistent stress change rule). According to the actual data of the nylon rivet, the ultimate breaking stress of the nylon rivet is sigma x =0.25 Mpa. The calculation result is shown in fig. 1.
As can be seen from fig. 1, at time t=9.9 ms, the stress value at the nylon rivet 2 is σ 2 =0.258 Mpa greater than σ x =0.25 Mpa, nylon rivet 2 breaks; at time t=10.5 ms, the stress value at nylon rivet 1 is σ 2 =0.251 Mpa greater than σ x =0.25 Mpa, nylon rivet 1 breaks. Because the positions of the nylon rivets 1 and 3 are symmetrical, the stress change rule is consistent, the moment when the nylon rivet 1 reaches the fracture stress is also the moment when the nylon rivet 3 breaks, and at the moment, the pressure release plate is completely opened, and the internal expansion gas is rapidReleasing the pressure in the cabinet body to drop rapidly. Namely, in the time period between t=0 ms and t=10.5 ms, when the cabin is in a sealed state and the internal air pressure continuously rises, the short-circuit arc pressure relief plate operates at the moment t max ＝10.5ms。
(1) Cable room cabinet safety margin calculation
Finding out the corresponding t of the full opening time of the pressure relief plate through simulation calculation max =10.5 ms cabinet stress maximum point σ g As shown in fig. 2. As can be seen from fig. 2, the most obvious position of the stress distortion of the inner wall of the cable chamber is the connection position of the inclined plate in the middle of the front surface of the cable chamber.
After confirming the distribution of the maximum stress points of the cable chamber where the short circuit arc impact occurs, the stress sigma after the generation of the short circuit arc is calculated g A time-dependent graph, as shown in fig. 3. Obtaining t max At time=10.5ms, the maximum point of cabinet stress corresponds to σ g ＝1.54×10 8 N/m 2 。
Because the switch cabinet body generally adopts high-quality steel plates, sigma j Typically takes a value of 3.2X10 8 N/m 2 . The safety margin K of the cable chamber cabinet body can be obtained through (1) σ ＝51％。
(2) Cable room cabinet door safety margin calculation
The complete opening time t of the pressure release plate is obtained by calculating the pressure distribution of the cabinet door max Time=10.5 ms corresponds to maximum point P of cabinet door pressure g In the position shown in fig. 10. As can be seen from FIG. 4, the maximum point P of the pressure of the rear cabinet door g The position is positioned at the left lower side of the cabinet door.
Calculating the maximum point P of pressure applied by the cabinet door after the short circuit arc is generated g A time-dependent graph is shown in fig. 5. Obtaining t max P corresponding to time=10.5 ms g ＝1.01Mpa。
The cable chamber cabinet door of the switch cabinet is generally fixed by 20 high-strength M10 bolts, and the stress section of each M10 bolt is 58mm 2 The tensile strength of the bolt is 800Mpa, and the maximum fracture force F=9.28×10 of 20M 10 bolts 5 N, cabinet door area s=0.9 mm 2 The cabinet door resists the impact pressure P j ＝1.03MPa。
As can be seen from fig. 5, at t max Time=10.5ms, maximum pressure P of switch cabinet door g The cabinet door has a pressure resistance of P when the pressure is 1.01Mpa j =1.03 MPa. The safety margin value of the cable chamber cabinet door obtained by the method (1) is only K P =2%, far less than the safety margin value of the cabinet.
From (1) and (2), the safety margin of the cable chamber cabinet body is K σ 51%, safety margin of cabinet door is K P =2%, due to K P <K σ The safety margin value of the switchgear cable chamber is therefore k=2%. It is known that the safety margin of the whole cable room is greatly reduced due to the low safety margin value of the cabinet door of the cable room.
2. Selection of the coating Polymer Material
The impact resistance performance is influenced by the material characteristics, and the operation condition requirement of the switch cabinet is considered, so that the selected high polymer covering material meets the following conditions: (1) has higher Young's modulus and Poisson's ratio; (2) has fireproof and flame-retardant properties; and (3) the cost is low and the processing is easy. By taking these factors into consideration, the ceramic silicone rubber polymer composite refractory material is selected as a covering layer in the embodiment of the application.
3. Polymer material coverage method calculation
Taking the actual size of a cable chamber of a reference KYN28-12 type switch cabinet as an example, the short circuit arc impact process and the pressure point distribution of the cable chamber are obtained through simulation calculation. When t max At time=10.5 ms, the heat source power was selected to be q= 8.578 ×10 under the cable chamber fully sealed condition 13 W/m 3 The simulation was performed by selecting a wall thickness of 2mm, and the distribution of the maximum pressure points of the cabinet door at the rear of the cable chamber at different moments was calculated, as shown in fig. 6.
As can be seen from fig. 6, during the short-circuit arc impact process of the cabinet door at different moments, the areas with the largest pressure are marked in the figure (the darker the color is the larger the pressure applied to the cabinet door), so that during the whole impact process, the areas with the larger pressure applied to the cabinet door are concentrated on the side edge and the bottom area of the cabinet door, and therefore, the union of the positions of the areas with the larger pressure applied to the cabinet door at different moments is selected as the coverage area of high-grade materials. A schematic diagram of the polymer material coverage area is shown in fig. 7.
The coverage area shown in fig. 7 is concave, the width of the coverage area on the left side and the right side is 250mm, and the width of the coverage area on the bottom is 300mm.
Taking the actual size of a cable chamber of a KYN28-12 type switch cabinet as an example, a ceramic silicon rubber polymer composite refractory material is covered on the inner side of a model cabinet door according to the identification area shown in fig. 7. The model of the ceramic silicone rubber covered polymer composite refractory is shown in fig. 8.
The action time t of the pressure release plate in the process of short circuit arc impact of the cable chamber of the switch cabinet is obtained through simulation calculation max =10.5 ms. When the thickness d=5 mm of the cover layer, P g =0.11 MPa; the maximum pressure when the polymer material is not covered is 1.01MPa, and the pressure is reduced by 89%. The covered cabinet door pressure distribution cloud chart is shown in fig. 9.
As can be seen from fig. 9, after the polymer material is covered, the impact force distribution concentration area of the rear cabinet door of the switch cabinet is obviously changed, the impact force distribution of the edge area (i.e. the coverage area) is obviously improved, and it is verified that the method of covering the polymer material can effectively balance and improve the impact force distribution of the cabinet door.
The ceramic silicon rubber polymer composite refractory materials with different thicknesses are selected to cover the marked area in fig. 7, and the action time t of the pressure relief plate is calculated respectively max The maximum pressure P applied to the cabinet door g . Drawing maximum pressure P g The thickness change of the polymer material is shown in fig. 10.
As can be seen from fig. 10, as the thickness of the ceramic silicone rubber covered polymer composite refractory increases, the pressure to which the cabinet door is subjected gradually decreases. At t max At time=10.5ms, when the thickness of the ceramic silicone rubber covered polymer composite refractory material is 3mm, the maximum pressure value of the cabinet door is P g =0.3 MPa, less than the limit pressure value P that can be tolerated by the cabinet door bolts j The safety margin value of the cabinet door is 70 percent which is larger than the safety margin of the cabinet body by 51 percent according to the calculation of the formula (1), and meets the design requirement, namely K P ≥K σ 。
The fitted relationship between the maximum pressure of the cabinet door and the thickness of the covering material obtained in fig. 10 also shows that when the covering material with the thickness of 3mm is selected, the pressure change rate is approaching a smaller value, i.e. when the thickness is further increased, the improvement of the pressure is relatively insignificant. Thus, considering technical specification requirements, economy and practical operating requirements, the thickness of the cover layer is selected to be 3mm.
In conclusion, the safety design improvement proposal of covering the ceramic silicon rubber polymer composite refractory material with the thickness of 3mm on the area with larger pressure inside the cable chamber door is obtained. Therefore, the application can further improve the operation safety of the switch cabinet based on the explosion-proof design of the existing switch cabinet.
The above description is only a preferred example of the application and is not intended to limit the application, but various modifications and variations can be made to the application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (3)
1. The method for improving the explosion-proof safety design of the 10kV high-voltage switch cabinet is characterized by comprising the following steps of: based on the existing explosion-proof design of the actual switch cabinet and the separate pressurizing plates of the isolation cabins, the safety margin value of each isolation cabin of the switch cabinet is calculated based on a multi-physical field coupling finite element calculation method aiming at the short circuit arc impact process occurring in the isolation cabin, and the impact force born by the weak part in the short circuit arc process is relaxed and balanced by a method of covering the weak part of the safety margin and the inner side of the safety margin by a high polymer composite refractory material, so that the safety margin of the weak part is improved, the overall safety level of the isolation cabin is further improved, and the stress or pressure P born by a cabinet body or a cabinet door after the short circuit arc is generated is calculated g The maximum point is changed with time to obtain the action time t of the pressure relief plate max Corresponding stress sigma g Or pressure P g The method comprises the steps of carrying out a first treatment on the surface of the Ultimate breaking stress sigma bearable by cabinet body or cabinet door material j Or pressure P j The calculated cabinet body or cabinet door safety margin is obtained by the formula (1):
the coverage area is determined according to the following principle: the method for determining the material coverage area covers the large stress or pressure concentration area born by the cabinet body or the cabinet door with small safety margin value, and comprises the following steps:
1) Finding out action time t from short-circuit arc to pressure release plate through simulation calculation max In the time period, the areas with larger stress or pressure on the cabinet body or the cabinet door at different moments are marked;
2) Selecting stress sigma of cabinet body or cabinet door at different moments g Or pressure P g The union of the positions of the larger areas is used as a coverage area of the high polymer material, and a coverage area schematic diagram is drawn;
the principle of determining the thickness of the covering layer is as follows: the impact force is balanced through the selection of the thickness, so that the safety margin value of the covered cabinet body or cabinet door is larger than or equal to the larger safety margin value in the cabinet body or cabinet door before the cover, and the method comprises the following steps:
1) The high polymer materials with different thicknesses are selected to cover the marked areas in the coverage area schematic diagram, and the action time t of the pressure relief plate is calculated respectively max Stress sigma applied to cabinet body or cabinet door g Or pressure P g ；
2) Drawing a relation chart of the maximum pressure of the cabinet door or the cabinet door along with the thickness of the covering layer;
3) And calculating safety margin values of the cabinet door or the cabinet door under different covering thicknesses, and determining the required thickness d of the covering layer meeting the requirements.
2. The method for improving the explosion-proof safety design of the 10kV high-voltage switch cabinet according to claim 1, wherein the safety margin of the isolation cabin is calculated by taking the safety margin value of the cabinet body and the cabinet door as the safety margin value of the whole cabin and taking the smaller safety margin value of the cabinet body and the cabinet door as the safety margin value of the whole cabin.
3. The method for improving the explosion-proof safety design of the 10kV high-voltage switch cabinet according to claim 1, wherein the selected high-polymer covering material is required to satisfy the following conditions: (1) has higher Young's modulus and Poisson's ratio; (2) has fireproof and flame-retardant properties; and (3) the cost is low and the processing is easy.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011117220A (en) * | 2009-12-04 | 2011-06-16 | Kyoei Ind Co Ltd | Cabinet door |
| CN204732712U (en) * | 2015-06-19 | 2015-10-28 | 浙江纳格电气有限公司 | Switch board door plant |
| CN210628751U (en) * | 2019-08-23 | 2020-05-26 | 上海Abb广电有限公司 | Arc burning prevention structure for switch cabinet |
| CN210957359U (en) * | 2019-12-31 | 2020-07-07 | 烟台北海电气有限公司 | Cable preposition high-voltage switch cabinet |
| CN112257195A (en) * | 2020-10-12 | 2021-01-22 | 长沙理工大学 | Explosion-proof safety design method for 10kV high-voltage switch cabinet |
-
2021
- 2021-04-02 CN CN202110359133.8A patent/CN113078576B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011117220A (en) * | 2009-12-04 | 2011-06-16 | Kyoei Ind Co Ltd | Cabinet door |
| CN204732712U (en) * | 2015-06-19 | 2015-10-28 | 浙江纳格电气有限公司 | Switch board door plant |
| CN210628751U (en) * | 2019-08-23 | 2020-05-26 | 上海Abb广电有限公司 | Arc burning prevention structure for switch cabinet |
| CN210957359U (en) * | 2019-12-31 | 2020-07-07 | 烟台北海电气有限公司 | Cable preposition high-voltage switch cabinet |
| CN112257195A (en) * | 2020-10-12 | 2021-01-22 | 长沙理工大学 | Explosion-proof safety design method for 10kV high-voltage switch cabinet |
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