CN113078576A - Safety performance improving method for 10kV high-voltage switch cabinet - Google Patents

Safety performance improving method for 10kV high-voltage switch cabinet Download PDF

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CN113078576A
CN113078576A CN202110359133.8A CN202110359133A CN113078576A CN 113078576 A CN113078576 A CN 113078576A CN 202110359133 A CN202110359133 A CN 202110359133A CN 113078576 A CN113078576 A CN 113078576A
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cabinet
switch cabinet
safety
pressure
cabinet door
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CN113078576B (en
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董盼
杨鑫
雷佳成
陈静雯
王延夫
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Changsha University of Science and Technology
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Changsha University of Science and Technology
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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
    • 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

Abstract

The invention discloses a method for improving the explosion-proof safety design of a 10kV high-voltage switch cabinet, which comprises the following steps: aiming at the internal short circuit electric arc impact process, the safety margin value of each isolation cabin of the switch cabinet is calculated based on a finite element calculation method of multi-physical-field coupling, aiming at the weak part of the safety margin, the impact force applied to the weak part in the short circuit electric arc process is relieved and balanced by a method of covering a high polymer composite refractory material on the inner side of the weak part, so that the safety margin of the weak part is improved, the integral safety level of the isolation cabin is further improved, and a method guide is provided for the safety design of a 10kV high-voltage switch cabinet. The invention can further improve the operation safety of the switch cabinet on the basis of the explosion-proof design of the existing switch cabinet.

Description

Safety performance improving method for 10kV high-voltage switch cabinet
Technical Field
The invention relates to the field of explosion prevention of 10kV high-voltage switch cabinets, in particular to an explosion-proof safety performance improving method caused by internal short-circuit electric arcs.
Background
With the rapid development of a power distribution network of a power system, stable and reliable power supply is continuously pursued by the power distribution network, and a 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 10kV switch cabinet is easy to have an internal short circuit arc fault due to problems of improper operation or defects in manufacturing processes of manufacturers, and explosion accidents are caused.
In order to reduce secondary damage caused by explosion accidents caused by short-circuit arc accidents, the switch cabinet is mostly designed by adopting a separation cabin, and each independent cabin is provided with an independent energy discharge channel. GB3906-2006 lists a 10kV switch cabinet internal short circuit arc burning test as a mandatory test, so as to test whether the safety performance of the switch cabinet reaches the standard.
Although the 10kV switch cabinet has matched safety design and test standards, secondary damage accidents caused by explosion of the switch cabinet still happen occasionally. According to statistics, the switch cabinet only in the handcart cabinet type is burnt up to 200 surfaces every year in China due to short circuit electric arcs, and most of the switch cabinets are broken or the cabinet doors are opened. Therefore, explosion accidents caused by short-circuit arc faults inside the 10kV switch cabinet cannot be ignored.
At present, the safety level of each isolation cabin of the switch cabinet is improved mainly by the optimized design of the cabinet body, the cabinet door and the pressure relief channel. However, the distribution of the explosion shock waves generated in the short circuit arc impact process in the switch cabinet is unbalanced, the internal structure of the switch cabinet is inconsistent, and a weak part with weak impact resistance performance inevitably exists. The safety index of the whole isolation cabin is determined by the safety index at the weakest part of the isolation cabin. Therefore, to improve the overall safety performance of the switch cabinet, the key point is to find out a link with weak safety resistance performance and take measures in a targeted manner to enable the link to reach a safety level matched with other parts of the whole switch cabinet.
On the basis of the existing explosion-proof design of an actual switch cabinet (the isolation cabins are respectively provided with a pressure relief plate), a safety margin value of each isolation cabin of the switch cabinet is calculated based on a finite element calculation method of multi-physical-field coupling, and the impact force applied to the weak part in the short circuit arc process is alleviated and balanced by covering a high-molecular composite refractory material on the inner side of the weak part aiming at the weak part of the safety margin, so that the safety margin of the weak part is improved, and the integral safety level of the isolation cabins is improved. And a method guidance is provided for improving the safety performance of the 10kV switch cabinet.
Disclosure of Invention
The invention provides a method for improving explosion-proof safety design of a 10kV high-voltage switch cabinet, which is used for solving the technical problems of casualties and equipment damage caused by internal short-circuit electric arc explosion of the 10kV high-voltage switch cabinet due to imperfect safety design theory and method.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
on the basis of the existing explosion-proof design of an actual switch cabinet (the isolation cabins are respectively provided with a pressure relief plate), aiming at the impact process of the short circuit electric arc in the switch cabinet, the safety margin value of each isolation cabin of the switch cabinet is calculated based on a finite element calculation method of multi-physical-field coupling, aiming at the weak part of the safety margin, the impact force of the weak part in the short circuit electric arc process is relieved and balanced by covering a high-molecular composite refractory material on the inner side of the weak part, so that the safety margin of the weak part is improved, and the integral 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:
1. the safety margin determination 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 relief plate does not act, the isolation chamber can be regarded as a closed environment. The electric arc energy can be diffused rapidly, so that the ambient temperature rises suddenly, the pressure in the isolation cabin increases suddenly, and under the continuous action of the internal and external pressure difference, the cabinet body can be torn or the cabinet door of the isolation cabin is opened, and the life safety of surrounding workers and the normal operation of equipment are threatened seriously. Therefore, the calculation of the safety margin of the isolation cabin is mainly based on the safety margin values of the cabinet body and the cabinet door, and the smaller value of the safety margin values of the cabinet body and the cabinet door 2 is taken as the safety margin of the whole cabin, and the method comprises the following steps:
(1) determining action moment t of energy leakage plate after explosionmax. Calculating the function relation of the stress at the nylon rivet of the pressure relief plate of the upper cover plate of the cable chamber with the time change after the cable chamber generates the short circuit electric arc, and obtaining the action time t of the pressure relief plate by taking the ultimate breaking stress of the nylon rivet as the basismax。
(2) And calculating the safety margin of the cabinet body (cabinet door). Calculating the stress sigma borne by the cabinet body (cabinet door) after the short-circuit arc is generatedg(or pressure P)g) The curve graph of the maximum point changing with time is obtained to obtain tmaxTime of dayCorresponding sigmag(or P)g) (ii) a Ultimate breaking stress sigma capable of bearing cabinet body (or cabinet door) materialj(or pressure P)j). The safety margin of the cabinet body (or the cabinet door) is calculated by the formula (1).
Figure BDA0003004787910000021
(3) And (4) 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. Selection of a covering polymer material:
the impact resistance performance is influenced by the material characteristics and the operating condition requirement of the switch cabinet is considered, and the selected high-molecular covering material meets the following requirements: (1) the Young modulus and the Poisson ratio are higher; (2) the fireproof flame-retardant performance is achieved; (3) low cost and easy processing.
3. Method for covering polymer material
The invention adopts the method that the inner side of the isolation cabin is covered with a polymer material with a certain thickness. In order to not influence subsequent operation and maintenance and achieve the optimal covering effect, the covering area and the material thickness of the material are optimally designed.
(1) The coverage area determination principle is as follows: the covering is carried out in the area where the cabinet body (or the cabinet door) bears large stress (or pressure) concentration. The method for determining the material coverage area is as follows:
1) finding out the action time t of the pressure relief plate by simulation calculationmaxIn the time period, the areas of the cabinet body (or the cabinet door) with larger stress (or pressure) at different moments are marked.
2) Selecting the stress sigma of the cabinet body (or the cabinet door) at different timesg(or pressure P)g) The union of the positions of the larger areas is used as the coverage area of the high polymer material, and a coverage area schematic diagram FIG is drawnx。
3) The selection method of the thickness of the covering material is as follows:
the thicker the polymer material is, the smaller the impact force on the cabinet body (or the cabinet door) under the same condition is, but the higher the impact force isThe thickness is not too thick for practical application. The principle of determination of the cover layer thickness should be: the impact force is balanced by selecting the thickness, so that the safety margin value K of the cabinet body (or the cabinet door)σ≥KPOr (K)σ≤KP). The method comprises the following steps:
1) selecting high polymer material pairs of different thicknessesxCovering the marked area, and calculating the action time t of the pressure relief platemaxStress sigma at cabinet body (or door)g(or pressure P)g)。
2) And drawing a graph of the maximum pressure of the cabinet door along with the change of the thickness of the covering layer.
3) Calculating the safety margin value of the cabinet door under different covering thicknesses when K isσ≥KPOr (K)σ≤KP) And if so, determining the required thickness d of the covering layer according to the requirement.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a graph of stress at a nylon rivet of a cable chamber pressure relief panel of a preferred embodiment of the present invention over time;
FIG. 2 is a graph of a stress maximum point distribution for a cable compartment cabinet according to a preferred embodiment of the present invention;
FIG. 3 is a graph of the stress maximum point of the cable compartment cabinet of the preferred embodiment of the present invention as a function of time;
FIG. 4 is a graph of the distribution of the maximum pressure experienced by the cable chamber cabinet door in accordance with the preferred embodiment of the present invention;
FIG. 5 is a graph of the maximum pressure experienced by the cable chamber door in accordance with a preferred embodiment of the present invention as a function of time;
FIG. 6 is a distribution diagram of the areas of greater pressure at different times for the cable chamber cabinet doors in accordance with the preferred embodiment of the present invention;
FIG. 7 is a schematic view of a cable compartment door footprint of a preferred embodiment of the present invention;
FIG. 8 is a diagram of a cable chamber cabinet door covered post-molding in accordance with a preferred embodiment of the present invention;
FIG. 9 is a pressure distribution diagram of a cable chamber cabinet door covered with a polymer material having a thickness of 5mm according to a preferred embodiment of the present invention;
FIG. 10 is a graph of the pressure experienced by the cable chamber door as a function of the thickness of the covering material in accordance with a preferred embodiment of the present invention;
the reference numerals in the figures denote:
1. 2, nylon rivets; 2. 1, nylon rivets; 3. a nylon rivet rupture stress reference line; 4. the maximum stress point of the cabinet body; 5. the maximum pressure point of the cabinet door; 6. the cabinet door pressure is in a large area at the moment when t is 6.5 ms; 7. the cabinet door pressure is in a large area at the moment when t is 8.5 ms; 8. the cabinet door pressure is in a large area at the moment when t is 10.5 ms; 9. the cabinet door is covered with a high polymer material; 10. a pressure relief plate; 11. the joint of the bus chamber and the inclined clapboard; 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 5mm is covered.
Detailed Description
The following detailed description of embodiments of the invention, but the invention can be practiced in many 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 (the isolation cabins are respectively provided with the pressure relief plates), and aiming at the impact process of the short circuit electric arc in the switch cabinet, the safety margin value of each isolation cabin of the switch cabinet is calculated based on a finite element calculation method of multi-physical field coupling, and aiming at the weak part of the safety margin, the impact force borne by the cabinet door in the short circuit electric arc process is alleviated and balanced by a method of covering the inner side of the weak part of the safety margin with a high polymer composite refractory material, so that the safety margin of the weak part is improved, and the overall safety level of the.
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 improvement methods of the other two high-voltage chambers (the bus chamber and the breaker chamber) are the same as the above, and the method includes the following specific steps when being executed:
1. and (3) determining and calculating the safety margin of the cable chamber of the switch cabinet:
by three-layer iteration of finite elements, the leakage is obtainedThe stress of the nylon rivet position of the pressure plate changes with time (the nylon rivets 1 and 3 are symmetrical in position and consistent in stress change rule). According to the actual data of the nylon rivet, the ultimate breaking stress of the nylon rivet is obtained as sigmax0.25 MPa. The calculation results are shown in fig. 1.
As can be seen from fig. 1, at the time t is 9.9ms, the stress value at the nylon rivet 2 is σ20.258MPa greater than sigmaxWhen the pressure is 0.25Mpa, the nylon rivet 2 is broken; at the time t-10.5 ms, the stress value at the nylon rivet 1 is σ20.251MPa greater than sigmaxWhen the pressure was 0.25Mpa, the nylon rivet 1 was broken. Because the nylon rivet 1, 3 position symmetry, the stress change law is unanimous, and nylon rivet 1 reaches the fracture stress moment, also for nylon rivet 3 break moment, at this moment, the pressure release board is opened completely, and inside inflation gas releases rapidly, and the pressure that bears in the cabinet body descends rapidly. That is, the time period between t and 10.5ms and the chamber is in a sealed state, the internal air pressure continues to rise, and the short-circuit arc pressure relief plate operates at time tmax＝10.5ms。
(1) Cable chamber cabinet body safety margin calculation
Finding t corresponding to the complete opening moment of the pressure relief plate through simulation calculationmaxMaximum stress point sigma of cabinet body of 10.5msgAs shown in fig. 2. As can be seen from fig. 2, the most significant position of the stress distortion of the inner wall of the cable chamber is the connection position of the inclined plates in the middle of the front surface of the cable chamber.
After confirming the distribution of the maximum stress points of the cable chamber with short circuit arc impact, calculating the stress sigma generated from the short circuit arcgThe graph is shown in fig. 3 as a function of time. To obtain tmaxAt the moment of 10.5ms, the maximum cabinet stress point corresponds to sigmag＝1.54×108N/m2。
As the switch cabinet body generally adopts high-quality steel plates, sigmajTypically 3.2 × 108N/m2. The safety margin K of the cable chamber cabinet body can be obtained through the formula (1)σ＝51％。
(2) Cable chamber cabinet door safety margin calculation
The pressure distribution of the cabinet door is calculated to obtain the complete opening of the pressure relief plateOn time tmaxCorresponding to the maximum point P of the pressure of the cabinet door at the moment of 10.5msgIn the position shown in fig. 10. As can be seen from FIG. 4, the maximum point P of the rear cabinet door pressuregThe position is positioned at the left lower side of the cabinet door.
Calculating the maximum pressure point P of the cabinet door after the short circuit arc is generatedgThe graph as a function of time is shown in fig. 5. To obtain tmaxP corresponding to time 10.5msg＝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 58mm2When the tensile strength of the bolt is 800Mpa, the maximum tensile fracture force F of 20M 10 bolts is 9.28 multiplied by 105N, area of cabinet door S is 0.9mm2Withstanding impact pressure P of cabinet doorj＝1.03MPa。
As can be seen from FIG. 5, at tmaxAt the time of 10.5ms, the maximum pressure P of the door of the switch cabinetg1.01Mpa, and the impact pressure of the cabinet door is Pj1.03 MPa. The safety margin value of the cable chamber cabinet door obtained by the formula (1) is only KP2%, which is far less than the safety margin value of the cabinet body.
As can be seen from (1) and (2), the safety margin of the cabinet body of the cable chamber is Kσ51%, the safety margin of the cabinet door is K P2% since KP<KσTherefore, the safety margin value of the cable chamber of the switch cabinet is K2%. Therefore, the safety margin of the whole cable chamber is greatly reduced due to the lower safety margin value of the cabinet door of the cable chamber.
2. Selection of the covering Polymer materials
The impact resistance performance is influenced by the material characteristics and the operating condition requirement of the switch cabinet is considered, and the selected high-molecular covering material meets the following requirements: (1) the Young modulus and the Poisson ratio are higher; (2) the fireproof flame-retardant performance is achieved; (3) low cost and easy processing. By comprehensively considering the factors, the ceramic silicon rubber polymer composite refractory material is selected as the covering layer in the embodiment of the invention.
3. Calculation of Polymer Material coverage method
With reference to the practice of KYN28-12 type switch cabinet cable chamberThe size is taken as an example, and the distribution of pressure points in the short circuit arc impact process of the cable chamber is obtained through simulation calculation. When t ismaxAt the time of 10.5ms, under the condition of completely sealing the cable chamber, the power of the heat source is selected to be 8.578 multiplied by 1013W/m3And selecting the wall thickness of 2mm for simulation, and calculating the distribution condition of the maximum pressure points of the rear cabinet door of the cable chamber at different moments, as shown in figure 6.
It can be known from fig. 6 that, the cabinet door is in the short circuit electric arc impact process of different moments, and the biggest region of pressure is the mark department in the picture (darker the colour represents that the cabinet door receives the pressure and is bigger), so can know, in whole impact process, the great region of pressure that the cabinet door receives all concentrates on the side and the bottom region of cabinet door, consequently selects the great regional position's of cabinet door pressure union of different moments as the coverage area of high score material. A schematic diagram of the polymer material coverage area is shown in fig. 7.
The coverage area shown in FIG. 7 is concave, the widths of the left and right coverage areas are 250mm, and the width of the bottom coverage area is 300 mm.
Taking the actual size of the cable chamber of the KYN28-12 type switch cabinet as an example, the inner side of the model cabinet door is covered with a ceramic silicon rubber polymer composite refractory material according to the marked area shown in FIG. 7. The model covered with the ceramic silicone rubber polymer composite refractory is shown in fig. 8.
Obtaining the action moment t of the pressure relief plate in the short circuit arc impact process of the cable chamber of the switch cabinet through simulation calculationmax10.5 ms. When the thickness d of the covering layer is 5mm, Pg0.11 MPa; the maximum pressure when the polymer material was not coated was 1.01MPa, which was decreased by 89%. The cloud of the pressure distribution of the covered cabinet door is shown in fig. 9.
As can be seen from fig. 9, after the high polymer material is covered, the distribution concentration area of the impact force applied to the rear cabinet door of the switch cabinet is obviously changed, the distribution of the impact force applied to the edge area (i.e., the covering area) is obviously improved, and it is verified that the method for covering with the high polymer material can effectively balance and improve the distribution of the impact force applied to the cabinet door.
Selecting ceramic silicon rubber polymer composite refractory materials with different thicknesses, and marking the materials in figure 7Covering the area, and calculating the action time t of the pressure relief platemaxMaximum pressure P on cabinet doorg. Plotting the maximum pressure PgThe graph is shown in fig. 10 according to the thickness variation of the covering polymer material.
As can be seen from fig. 10, as the thickness of the ceramic silicon rubber polymer composite fireproof material is increased, the pressure applied to the cabinet door is gradually reduced. At tmaxWhen the thickness of the covered ceramic silicon rubber polymer composite refractory material is 3mm at the time of 10.5ms, the maximum pressure value of a cabinet door is Pg0.3MPa, less than the limit pressure value P that the bolt of the cabinet door can bearj1.03MPa, the safety margin value of the cabinet door is 70 percent according to the formula (1), the safety margin value is larger than 51 percent of the safety margin of the cabinet body, and the design requirement, namely K is metP≥Kσ。
The fitting relation curve of the maximum pressure of the cabinet door and the thickness of the covering material obtained from fig. 10 can also find that when the high polymer material covering 3mm is selected, the pressure change rate approaches a smaller value, namely when the thickness is continuously increased, the improvement of the pressure is relatively no longer obvious. Thus, the cover thickness is chosen to be 3mm, taking into account specification requirements, economy and practical operating requirements.
Therefore, a safety design improvement suggestion that a ceramic silicon rubber polymer composite refractory material with the thickness of 3mm is covered in a region with larger pressure at the inner side of the cabinet door of the cable chamber is obtained. Therefore, the invention can further improve the operation safety of the switch cabinet on the basis of the explosion-proof design of the existing switch cabinet.
The above description is only a preferred example of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (6)

1. A method for improving explosion-proof safety design of a 10kV high-voltage switch cabinet is characterized by comprising the following steps: on the basis of the existing explosion-proof design of an actual switch cabinet (the isolation cabins are respectively provided with a pressure relief plate), aiming at the short circuit electric arc impact process in the switch cabinet, the safety margin value of each isolation cabin of the switch cabinet is calculated based on a finite element calculation method of multi-physical-field coupling, aiming at the weak part of the safety margin, the impact force of the weak part in the short circuit electric arc process is relieved and balanced by covering a high-molecular 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 cabins is improved.
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 calculation of the isolation cabin is mainly characterized by the safety margin values of the cabinet body and the cabinet door, and the smaller value of the safety margins of the cabinet body and the cabinet door is taken 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 stress sigma borne by the cabinet body (cabinet door) after the short-circuit arc is generated is calculatedg(or pressure P)g) The curve graph of the maximum point changing with time is obtained to obtain tmaxSigma corresponding to timeg(or P)g) (ii) a Ultimate breaking stress sigma capable of bearing cabinet body (or cabinet door) materialj(or pressure P)j). The safety margin of the cabinet body (or the cabinet door) is calculated by the formula (1).
Figure FDA0003004787900000011
4. The method for improving the explosion-proof safety design of the 10kV high-voltage switch cabinet according to claim 1, wherein the selected polymer covering material is selected to satisfy the following conditions: (1) the Young modulus and the Poisson ratio are higher; (2) the fireproof flame-retardant performance is achieved; (3) low cost and easy processing.
5. The method for improving the explosion-proof safety design of the 10kV high-voltage switch cabinet according to claim 1, wherein the determination principle of the coverage area is as follows: the covering is carried out in the area where the cabinet body (or the cabinet door) bears large stress (or pressure) concentration. The method for determining the material coverage area is as follows:
1) finding out the action time t of the pressure relief plate by simulation calculationmaxIn the time period, the areas of the cabinet body (or the cabinet door) with larger stress (or pressure) at different moments are marked.
2) Selecting the stress sigma of the cabinet body (or the cabinet door) at different timesg(or pressure P)g) The union of the positions of the larger areas is used as the coverage area of the high polymer material, and a coverage area schematic diagram FIG is drawnx。
6. The method for improving the explosion-proof safety design of the 10kV high-voltage switch cabinet according to claim 1, wherein the principle for determining the thickness of the covering layer is as follows: the impact force is balanced by selecting the thickness, so that the safety margin value K of the cabinet body (or the cabinet door)σ≥KPOr (K)σ≤KP). The method comprises the following steps:
1) selecting high polymer material pairs of different thicknessesxCovering the marked area, and calculating the action time t of the pressure relief platemaxStress sigma at cabinet body (or door)g(or pressure P)g)。
2) And drawing a graph of the maximum pressure of the cabinet door along with the change of the thickness of the covering layer.
3) Calculating the safety margin value of the cabinet door under different covering thicknesses when K isσ≥KPOr (K)σ≤KP) And if so, determining the required thickness d of the covering layer according to the requirement.
CN202110359133.8A 2021-04-02 2021-04-02 10kV high-voltage switch cabinet safety performance improving method Active CN113078576B (en)

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Citations (5)

* Cited by examiner, † Cited by third party
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 Distribution cabinet door plate
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

Patent Citations (5)

* Cited by examiner, † Cited by third party
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 Distribution cabinet door plate
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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