CN106529010B - Method for designing anti-condensation ring main unit shell by using finite element model - Google Patents
Method for designing anti-condensation ring main unit shell by using finite element model Download PDFInfo
- Publication number
- CN106529010B CN106529010B CN201610967682.2A CN201610967682A CN106529010B CN 106529010 B CN106529010 B CN 106529010B CN 201610967682 A CN201610967682 A CN 201610967682A CN 106529010 B CN106529010 B CN 106529010B
- Authority
- CN
- China
- Prior art keywords
- main unit
- ring main
- model
- shell
- various data
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000009833 condensation Methods 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000009826 distribution Methods 0.000 claims abstract description 16
- 238000009423 ventilation Methods 0.000 claims abstract description 9
- 238000004364 calculation method Methods 0.000 claims abstract description 5
- 239000011257 shell material Substances 0.000 claims description 37
- 239000012530 fluid Substances 0.000 claims description 22
- 238000012546 transfer Methods 0.000 claims description 18
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 230000003746 surface roughness Effects 0.000 claims description 3
- 230000005494 condensation Effects 0.000 abstract description 15
- 230000000694 effects Effects 0.000 abstract description 4
- 230000002265 prevention Effects 0.000 abstract description 3
- 239000003570 air Substances 0.000 description 8
- 238000013461 design Methods 0.000 description 4
- 238000004088 simulation Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 239000002274 desiccant Substances 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 229920006351 engineering plastic Polymers 0.000 description 2
- 239000012080 ambient air Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 238000007731 hot pressing Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
- G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Computer Hardware Design (AREA)
- Evolutionary Computation (AREA)
- Geometry (AREA)
- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Management, Administration, Business Operations System, And Electronic Commerce (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention provides a method for designing an anti-condensation ring main unit shell by using a finite element model, which comprises the following steps: s1, performing overall three-dimensional modeling on the ring main unit equipment, wherein model parameters comprise the front-back and left-right spacing between the ring main unit and the shell, the height of a top space, the shape of a ventilation opening, the position distribution of the ventilation opening and the inclination angle of the top of the shell; s2, importing the model into an ANSYS software CFX toolbox for grid division; s3, setting boundary conditions of the model; s4, obtaining various data of the ring main unit shell through analog calculation; s5, judging whether the obtained various data meet the preset conditions; s6, if not, adjusting one or more corresponding values in the model parameters, and returning to the step S2; and S7, if yes, outputting the obtained various data. By implementing the method, the modeling analysis is carried out on the humidity, the temperature, the wind speed and the like in the ring main unit, so that the formed ring main unit can achieve the purposes of reducing condensation effect, reducing the occurrence rate of electrical accidents and the like without adopting the condensation prevention measures in the prior art.
Description
Technical Field
The invention relates to the technical field of ring main unit protection, in particular to a method for designing an anti-condensation ring main unit shell by using a finite element model.
Background
The looped network cabinet is widely applied to urban power distribution systems due to the advantages of simple structure, small maintenance amount, low operating cost, reliable and safe operation and the like, but in the south area of the Yangtze river in China, the looped network cabinet is easy to suffer from serious condensation problems due to a high-temperature damp and hot environment, equipment in the looped network cabinet is rusted, an operating mechanism is jammed and corroded, and phenomena such as line short circuit tripping and the like occur, so that the power supply safety is directly influenced.
In order to reduce the condensation problem of the ring main unit, the currently generally adopted condensation prevention measure mainly adopts a lifting auxiliary design, and comprises the steps of forced ventilation through a distribution room, setting of a dehumidifier, setting of a heater, use of a drying agent and the like to control the humidity.
However, since the active devices (such as the exhaust fan, the heater and the semiconductor refrigerator) in the auxiliary design are separately powered by the secondary power supply, not only the installation and modification work amount is large, but also the input and the removal of the active devices need to be completed by manpower, the operability is poor, and the following two extreme situations occur: (1) the active equipment is operated all the time after being put into operation, so that unnecessary power consumption waste is caused; (2) active equipment is not started in time according to climate change, so that the condensation condition in the cabinet cannot be improved. Even if the condensation sensor is utilized to automatically start the active device to heat and prevent condensation, the following two defects exist: (1) since the condensation sensor is a passive type action device, there is a lack of preventive processes in action time; (2) if the mounting position of the condensation sensor is improper, the condensation can not be guaranteed to firstly occur near the sensor, and the timely investment of active equipment can not be guaranteed.
Meanwhile, the drying agent in the auxiliary design belongs to consumable materials, and the drying agent needs to be replaced or dried manually according to the predicted saturation time.
Disclosure of Invention
The technical problem to be solved by the embodiments of the present invention is to provide a method for designing an anti-condensation ring main unit housing by using a finite element model, which can perform comprehensive and accurate modeling analysis on humidity, temperature, wind speed and the like inside the ring main unit, so that the formed ring main unit can achieve the purposes of reducing condensation effect, reducing electrical accident rate and the like without adopting anti-condensation measures in the prior art.
In order to solve the above technical problem, an embodiment of the present invention provides a method for designing an anti-condensation ring main unit casing by using a finite element model, where the method includes:
s1, performing overall three-dimensional modeling on the ring main unit equipment through three-dimensional software, wherein parameters related to the model comprise the front-back left-right distance between the ring main unit and the shell, the height of a top space, the shape of a ventilation opening, the position distribution of the ventilation opening and the inclination angle of the top of the shell;
s2, importing the model into a CFX tool box of ANSYS software for grid division;
s3, setting boundary conditions of the model;
s4, obtaining various data of the ring main unit shell through analog calculation;
s5, judging whether the obtained various data of the ring main unit shell meet preset conditions;
s6, if not, adjusting one or more corresponding values of the parameters related to the three-dimensional equipment model, and returning to the step S2;
and S7, if yes, outputting the obtained various data of the ring main unit shell.
Wherein, the three-dimensional software adopted in the step S1 is SolidWorks software.
Wherein, the step S3 specifically includes:
selecting the fluid type and setting relevant parameters; wherein the selected fluid is air at 25 ℃ or air and water vapor mixed in a certain proportion; relevant parameters of the setting comprise a turbulent flow type of the fluid, a heat transfer type of the fluid and a gravitational field;
setting interface parameters of the model; the set interface parameters comprise the type of each surface of the model, the surface roughness of the shell material of the ring main unit, the heat conductivity coefficient of the wall surface of the shell material of the ring main unit and the heating power of the average area of the bus passing part.
Wherein, at low Reynolds numbers, the turbulence type of the fluid employs a k-Epsilon model to calculate media flow and the heat transfer type of the fluid employs an enthalpy model to calculate gas heat transfer.
Wherein the calculated gas heat transfer includes convective heat transfer and thermal heat transfer.
When the type of one surface of the model which is led into the model comprises a vent, the vent can be set to enable gas to flow in a one-way mode or gas to flow in a free two-way mode on the leading-in surface.
When the ring main unit shell is made of steel, the heat conductivity coefficient of the ring main unit shell is 49.9W/m.K.
The obtained various data of the ring main unit shell comprise the flow size of the air vent, a gas flow diagram, the temperature and pressure distribution condition of the wall surface and the internal humidity distribution condition.
The embodiment of the invention has the following beneficial effects:
the invention utilizes the CFX tool box of ANSYS software to carry out flow-thermal coupling simulation on the ring main unit equipment with a specific structure and distributed in the vent, and finally obtains various data (such as indexes of flow passing through the vent, a gas flow chart, the temperature and pressure distribution condition of the wall surface, the internal humidity distribution condition and the like) of the shell of the ring main unit from the simulation result.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is within the scope of the present invention for those skilled in the art to obtain other drawings based on the drawings without inventive exercise.
Fig. 1 is a flowchart of a method for designing an anti-condensation ring main unit enclosure using a finite element model according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1, in an embodiment of the present invention, a method for designing an anti-condensation ring main unit enclosure using a finite element model is provided, where the method includes:
s1, performing overall three-dimensional modeling on the ring main unit equipment through three-dimensional software, wherein parameters related to the model comprise the front-back left-right distance between the ring main unit and the shell, the height of a top space, the shape of a vent, the position distribution of the vent and the inclination angle of the top of the shell;
step S2, importing the model into a CFX tool box of ANSYS software for grid division;
step S3, setting boundary conditions of the model;
s4, obtaining various data of the ring main unit shell through analog calculation;
step S5, judging whether the obtained various data of the ring main unit shell meet the preset conditions; if not, the next step S6 is executed; if so, go to step S7;
step S6, adjusting one or more corresponding values of the parameters related to the three-dimensional equipment model, and returning to step S2;
and S7, outputting the obtained various data of the ring main unit shell.
It should be noted that the various data of the ring main unit casing include the flow rate through the vent, the gas flow chart, the wall temperature and pressure distribution, and the internal humidity distribution.
In the embodiment of the present invention, the three-dimensional software adopted in step S1 is SolidWorks software, and the variation of the parameter values related to the model may change the inlet and outlet conditions of the air path inside the ring main unit, thereby affecting the ventilation effect.
In the embodiment of the present invention, the grid division in step S2 needs to meet the calculation requirement of ANSYS software.
In this embodiment of the present invention, step S3 specifically includes:
selecting the fluid type and setting relevant parameters; wherein, the fluid type can be air at 25 ℃, or air and water vapor mixed according to a certain proportion, and the mixing proportion refers to the climate environment of the area; relevant parameters set include the type of turbulence of the fluid, the type of heat transfer of the fluid, and the gravitational field. In one embodiment, at low reynolds numbers, the turbulence type of the fluid uses a k-Epsilon model to calculate the media flow and the heat transfer type of the fluid uses an enthalpy model to calculate the gas heat transfer, the calculated gas heat transfer including convective heat transfer and conductive heat transfer, but without considering the energy change caused by the kinetic energy of the gas;
setting interface parameters of the model; the set interface parameters comprise the type of each surface of the imported model, the surface roughness of the shell material of the ring main unit, the heat conductivity of the wall surface of the shell material of the ring main unit and the heating power of the average area of the bus passing part. In one embodiment, when one surface type of the introduction model comprises a vent, the vent can be set to be in one-way gas flow or free two-way gas flow on the introduction surface, for example, the surface type of the vent can be INLET, namely, fluid can flow in one direction through the surface, the INLET wind speed is set, and the surface type of other parts is set to be WALL to restrain the internal fluid; the vent surface type can also be selected as OPEN, i.e., the fluid is free to flow in both directions through the surface, and the surface types at other locations are configured as wells to confine the internal fluid. In another embodiment, the shell of the ring main unit can be made of steel or engineering plastics; when the ring main unit shell material is made of steel, the heat conductivity coefficient of the ring main unit shell material (steel) is 49.9W/m.K, and the heat conductivity coefficient of the ring main unit shell material (steel) made of engineering plastics is lower.
It should be noted that the surface temperature of the bus and the location of the charged device is higher than the ambient air due to the heat generation, so the humid air inside the ring main unit cannot be directly condensed on the key surface of the location, and the main reason of the failure is that the condensed water at other locations falls or flows to the surface of the location. Because the power of the air current not only comes from the wind pressure, but also includes the hot pressing, therefore it is necessary to design the heating power of the average area of the bus passing position, the bus passing position is radiated by strengthening the natural ventilation, the temperature difference inside the ring main unit is reduced, and then the condition of forming the condensation is destroyed, so that the formed ring main unit can achieve the purposes of reducing the condensation effect, reducing the occurrence rate of electrical accidents and the like without adopting the condensation prevention measure in the prior art.
In the embodiment of the present invention, the various data of the ring main unit shell obtained in step S5 should find the optimal result within a predetermined reasonable range.
The embodiment of the invention has the following beneficial effects:
the invention utilizes the CFX tool box of ANSYS software to carry out flow-thermal coupling simulation on the ring main unit equipment with a specific structure and distributed in the vent, and finally obtains various data (such as indexes of flow passing through the vent, a gas flow chart, the temperature and pressure distribution condition of the wall surface, the internal humidity distribution condition and the like) of the shell of the ring main unit from the simulation result.
It will be understood by those skilled in the art that all or part of the steps in the method for implementing the above embodiments may be implemented by relevant hardware instructed by a program, and the program may be stored in a computer-readable storage medium, such as ROM/RAM, magnetic disk, optical disk, etc.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention, and it is therefore to be understood that the invention is not limited by the scope of the appended claims.
Claims (7)
1. A method for designing an anti-condensation ring main unit shell by using a finite element model is characterized by comprising the following steps:
s1, performing overall three-dimensional modeling on the ring main unit equipment through three-dimensional software, wherein parameters related to the model comprise the front-back left-right distance between the ring main unit and the shell, the height of a top space, the shape of a ventilation opening, the position distribution of the ventilation opening and the inclination angle of the top of the shell;
s2, importing the model into a CFX tool box of ANSYS software for grid division;
s3, setting boundary conditions of the model;
s4, obtaining various data of the ring main unit shell through analog calculation;
s5, judging whether the obtained various data of the ring main unit shell meet preset conditions;
s6, if not, adjusting one or more corresponding values of the parameters related to the three-dimensional equipment model, and returning to the step S2;
s7, if yes, outputting various data of the obtained ring main unit shell;
wherein, the step S3 specifically includes:
selecting the fluid type and setting relevant parameters; wherein the selected fluid is air at 25 ℃ or air and water vapor mixed in a certain proportion; relevant parameters of the setting comprise a turbulent flow type of the fluid, a heat transfer type of the fluid and a gravitational field;
setting interface parameters of the model; the set interface parameters comprise the type of each surface of the model, the surface roughness of the shell material of the ring main unit, the heat conductivity coefficient of the wall surface of the shell material of the ring main unit and the heating power of the average area of the bus passing part.
2. The method according to claim 1, wherein the three-dimensional software used in step S1 is SolidWorks software.
3. The method of claim 1, wherein at low reynolds numbers the turbulence type of the fluid uses a k-Epsilon model to calculate media flow and the heat transfer type of the fluid uses an enthalpy model to calculate gas heat transfer.
4. The method of claim 3, wherein the calculated gas heat transfer comprises convective heat transfer and conductive heat transfer.
5. A method according to claim 1, wherein, when the type of introduction into a face of the mould comprises a vent, the vent is arranged to provide one-way flow or free two-way flow of gas over the introduction face.
6. The method as claimed in claim 1, wherein when the ring main unit shell material is made of steel, the thermal conductivity of the ring main unit shell material is 49.9W/m-K.
7. The method according to claim 1, wherein the obtained various data of the ring main unit shell comprises flow rate through the vent, a gas flow chart, a temperature and pressure distribution of the wall surface and an internal humidity distribution.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610967682.2A CN106529010B (en) | 2016-11-01 | 2016-11-01 | Method for designing anti-condensation ring main unit shell by using finite element model |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610967682.2A CN106529010B (en) | 2016-11-01 | 2016-11-01 | Method for designing anti-condensation ring main unit shell by using finite element model |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106529010A CN106529010A (en) | 2017-03-22 |
| CN106529010B true CN106529010B (en) | 2020-04-24 |
Family
ID=58326426
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610967682.2A Active CN106529010B (en) | 2016-11-01 | 2016-11-01 | Method for designing anti-condensation ring main unit shell by using finite element model |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106529010B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110762268A (en) * | 2018-07-09 | 2020-02-07 | 重庆川仪调节阀有限公司 | Method for designing internal dimension of regulating valve |
| CN111368434B (en) * | 2020-03-05 | 2023-05-12 | 包头美科硅能源有限公司 | Prediction method of Czochralski method monocrystalline silicon solid-liquid interface based on ANN |
| CN114895732B (en) * | 2022-04-18 | 2024-08-20 | 交控科技股份有限公司 | Anti-condensation method and system for environmental test chamber |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103699744A (en) * | 2013-12-25 | 2014-04-02 | 国电南京自动化股份有限公司 | Wind power master control cabinet heat management analysis and optimization method based on finite element method |
| CN104600610A (en) * | 2014-06-24 | 2015-05-06 | 云南电网公司 | Construction method for prefabricated substation |
| CN105183976A (en) * | 2015-09-02 | 2015-12-23 | 南车株洲电力机车研究所有限公司 | Method for carrying out finite element analysis on vehicle-mounted cabinet body |
-
2016
- 2016-11-01 CN CN201610967682.2A patent/CN106529010B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103699744A (en) * | 2013-12-25 | 2014-04-02 | 国电南京自动化股份有限公司 | Wind power master control cabinet heat management analysis and optimization method based on finite element method |
| CN104600610A (en) * | 2014-06-24 | 2015-05-06 | 云南电网公司 | Construction method for prefabricated substation |
| CN105183976A (en) * | 2015-09-02 | 2015-12-23 | 南车株洲电力机车研究所有限公司 | Method for carrying out finite element analysis on vehicle-mounted cabinet body |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106529010A (en) | 2017-03-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106529010B (en) | Method for designing anti-condensation ring main unit shell by using finite element model | |
| Mei et al. | Thermal buoyancy driven flows inside the industrial buildings primarily ventilated by the mechanical fans: Local facilitation and infiltration | |
| Li et al. | A new solution for thermal interference of vertical U-tube ground heat exchanger for cold area in China | |
| CN102915776B (en) | Passive containment thermal conduction system test method | |
| Calautit et al. | Numerical investigation of the integration of heat transfer devices into wind towers | |
| Zhou et al. | Effect of key parameters on the transient thermal performance of a building envelope with Trombe wall containing phase change material | |
| CN204732736U (en) | A kind of intelligent power distribution room | |
| Kanaan et al. | CFD study of ventilation for indoor multi-zone transformer substation | |
| CN105551551B (en) | A kind of pool type natrium cold fast reactor low power run method that conventional island input is not required | |
| Liu et al. | Study on ventilation of indoor substation main transformer room based on COMSOL software | |
| CN105373859A (en) | Community power distribution room heat radiation optimization method and system | |
| CN105138727A (en) | Modeling method based on isolated phase bus natural hot pressing for underground power plant | |
| CN206771817U (en) | A kind of box side air-out condenser of L-shaped | |
| CN206879301U (en) | A kind of new photovoltaic plant supervising device cabinet heat radiation system | |
| CN109346278B (en) | Transformer room temperature optimization method based on high-temperature environment | |
| Taler et al. | Modeling of cooling of ceramic heat accumulator | |
| Cui et al. | Theoretical analysis and numerical study of natural convection inside combined solar chimney | |
| CN101435420A (en) | Thermal recovery circulating system of air compressor | |
| CN207409890U (en) | Substation's ventilation heat abstractor | |
| CN206386292U (en) | Main transformer room heat-dissipation blower fan | |
| CN205846507U (en) | A kind of heat abstractor of low-voltage distribution cabinet | |
| Ahmed et al. | Energy saving and indoor thermal comfort enhancement by using a novel heat extract slot system installed on external room wall | |
| CN205137916U (en) | Heating device | |
| CN204558948U (en) | Box type transformer intelligent temperature control ventilation unit | |
| Zhu et al. | Scale modelling studies on smoke movement in vertical shafts of tall buildings |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |