CN110781589B - Method for detecting overheating fault of lap joint of gas insulated metal closed power transmission line - Google Patents
Method for detecting overheating fault of lap joint of gas insulated metal closed power transmission line Download PDFInfo
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Abstract
The invention designs a method for detecting an overheating fault at a lap joint of a gas insulated metal closed power transmission line. The method comprises the steps of modeling the gas insulated metal closed power transmission line and calculating the temperature of the shell of the gas insulated metal closed power transmission line according to related parameters to detect and judge whether the lap joint of the gas insulated metal closed power transmission line has an overheating fault. The invention judges through modeling simulation, avoids direct measurement of the temperature of the gas insulated metal closed transmission line, has convenient and rapid whole detection process, does not need shutdown, effectively reduces the detection cost, and has practicability and economy.
Description
Technical Field
The invention relates to the technical field of electric power system maintenance, in particular to a method for detecting an overheating fault at a lap joint of a gas insulated metal closed power transmission line.
Background
In practical application, a current-carrying conductor joint is easy to overheat due to the increase of contact resistance, so that the contact resistance is further increased, the temperature of a contact point is possibly increased to the melting point or even the boiling point of a joint material, and the insulation between the conductor and a shell is damaged by molten Metal, so that a short-circuit accident is caused. With the large amount of GILs put into operation, overheating faults caused by poor contact at the lap joint of three-phase conductors of the GILs occur occasionally, and the safe and reliable operation of a power system is seriously threatened. However, because such faults occur in a closed metal cavity, and the fault latency is long, detection of such faults is difficult to a certain extent, and an effective method or means for detecting the overheating fault at the lap joint of the gas insulated metal closed power transmission line is still lacked at present.
Disclosure of Invention
Therefore, it is necessary to provide a method for detecting an overheating fault at a lap joint of a gas insulated metal-enclosed power transmission line, aiming at the problem that the traditional technology cannot accurately and effectively detect the overheating fault at the lap joint of the gas insulated metal-enclosed power transmission line.
A method for detecting an overheating fault at a lap joint of a gas insulated metal closed power transmission line comprises the following steps:
establishing a first simulation calculation model of the gas-insulated metal closed power transmission line to be tested;
giving material properties to each component of the first simulation calculation model;
measuring the resistance of each section of conductor of the gas insulated metal closed transmission line to be measured and the contact resistance of the lap joint of the conductor;
the resistance of each section of conductor of the gas insulated metal closed transmission line to be detected and the contact resistance of the lap joint of the conductor are led into a first simulation calculation model endowed with material properties;
ohmic loss distribution of the first simulation calculation model is calculated according to the introduced conductor resistance and the contact resistance of the conductor lap joint;
introducing a fluid domain condition into the first simulation calculation model without the material attribute, establishing a second simulation calculation model, and giving the material attribute to each component of the second simulation calculation model;
introducing the ohmic loss serving as a heat source into the second simulation calculation model, and calculating a temperature field and an air flow field of the second simulation calculation model after the heat source is introduced;
comparing the temperature field and the gas flow field of the second simulation calculation model with the temperature field and the gas flow field of the gas insulated metal closed power transmission line in a normal state respectively;
and when the temperature field and the gas flow field of the second simulation calculation model change beyond a certain threshold value in a normal state, judging that the gas insulated metal closed power transmission line to be detected has an overheating fault.
In one embodiment, the method for establishing the first simulation calculation model of the gas-insulated metal enclosed transmission line to be tested includes:
measuring the outline dimension of the gas insulated metal closed power transmission line to be measured;
and establishing the first simulation calculation model according to the measured external dimension data by using three-dimensional modeling software solidworks according to the proportion of the entity 1.
In one embodiment, the first simulation calculation model comprises an outer shell model and an inner conductor model of the gas-insulated metal enclosed power transmission line.
In one embodiment, the manner for measuring the resistance of each section of conductor of the gas-insulated metal closed transmission line to be measured and the contact resistance at the overlapping part of the conductor comprises at least one of a loop resistance meter measurement method or a double-arm bridge measurement method.
In one embodiment, the step of calculating the ohmic loss distribution of the first simulation calculation model according to the introduced conductor resistance and the contact resistance at the conductor lap joint comprises the following steps:
performing self-adaptive mesh generation on the first simulation calculation model, and performing eddy current field analysis;
and acquiring the ohmic loss distribution of the first simulation calculation model according to the eddy current field analysis result to be used as the ohmic loss distribution of the insulated metal closed power transmission line.
In one embodiment, the step of introducing fluid domain conditions into a first simulation calculation model to which no material properties are assigned, building a second simulation calculation model, and assigning material properties to components of the second simulation calculation model comprises:
setting air material properties outside a shell model of the gas insulated metal closed transmission line, and establishing an air domain;
and arranging insulating gas material attributes including one or more of sulfur hexafluoride, nitrogen and mixed gas of sulfur hexafluoride and nitrogen in the shell model of the gas-insulated metal closed transmission line to establish an insulating gas domain.
In one embodiment, the step of introducing the ohmic loss as a heat source into the second simulation calculation model and calculating the temperature field and the gas flow field of the second simulation calculation model after the heat source is introduced comprises:
performing self-adaptive mesh generation analysis on the second simulation calculation model;
introducing the ohmic loss serving as a heat source into a second simulation calculation model after the self-adaptive mesh generation analysis;
and calculating the temperature field and the gas flow field of the second simulation calculation model after the heat source is introduced.
In one embodiment, the step of performing adaptive mesh generation analysis on the second simulation computation model includes:
the insulating gas material in the gas-insulated metal closed power transmission line in the second simulation calculation model is equivalent to a solid block, and corresponding attributes of the insulating gas material are given to the insulating gas material;
and carrying out self-adaptive mesh generation on the second simulation calculation model.
In one embodiment, the step of calculating the temperature field and the gas flow field of the second simulation calculation model after the introduction of the heat source includes:
performing solid equivalence on an insulating gas material in the gas-insulated metal closed power transmission line in the second simulation calculation model after the self-adaptive mesh generation analysis to form a gas, and endowing the insulating gas material with corresponding properties;
and calculating an eddy current field by self-adaptive mesh subdivision analysis, comprehensively considering heat transfer modes of heat conduction, heat radiation and heat convection, calculating the heat radiation by using a discrete coordinate method, and acquiring a temperature field and an airflow field of the second simulation calculation model.
In one embodiment, the step of comparing the temperature field and the gas flow field of the second simulation calculation model with the temperature field and the gas flow field of the gas-insulated metal enclosed power transmission line in a normal state respectively further includes:
establishing a third simulation calculation model of the gas-insulated metal closed power transmission line to be tested;
giving material attributes to each component of the third simulation calculation model, wherein the material attributes are corresponding to each component of the gas insulated metal enclosed transmission line to be detected in a normal state;
the resistance of each section of conductor of the gas insulated metal closed transmission line to be detected and the contact resistance of the lap joint of the conductor under the normal state are led into a third simulation calculation model endowed with material properties;
calculating the ohm loss distribution of the third simulation calculation model according to the introduced conductor resistance and the contact resistance at the conductor lap joint;
introducing a fluid domain condition into a third simulation calculation model without material attributes, establishing a fourth simulation calculation model, and giving material attributes to each component of the fourth simulation calculation model, wherein the material attributes are corresponding to each component of the gas insulated metal enclosed transmission line to be detected in a normal state;
and introducing the ohmic loss serving as a heat source into the fourth simulation calculation model, and calculating a temperature field and a gas flow field of the fourth simulation calculation model after the heat source is introduced as the temperature field and the gas flow field of the gas-insulated metal closed power transmission line in a normal state.
According to the method for detecting the overheating fault at the lap joint of the gas insulated metal-enclosed power transmission line, the solid model of the gas insulated metal-enclosed power transmission line to be detected is established, the parameters are introduced for calculation, the temperature field and the airflow field of the gas insulated metal-enclosed power transmission line to be detected are simulated, and compared with the temperature field and the airflow field of the gas insulated metal-enclosed power transmission line in a normal state, whether the gas insulated metal-enclosed power transmission line to be detected has the overheating fault can be judged visually and accurately, meanwhile, the whole detection process is convenient and clear, the shutdown is not needed, the detection cost is effectively reduced, and the method has practicability and economical efficiency.
Drawings
Fig. 1 is a schematic flow chart illustrating a method for detecting an overheating fault at a lap joint of a gas insulated metal enclosed transmission line in an embodiment;
FIG. 2 is a schematic view of a simulation calculation model for introducing fluid domain conditions in one embodiment;
fig. 3 is a schematic diagram illustrating temperature comparison of the outer shell of the gas insulated metal enclosed power transmission line in an embodiment.
Detailed Description
To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present application are given in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
When the lap joint of the gas insulated metal closed transmission line has an overheating fault, a conductor inside the gas insulated metal closed transmission line can generate a large amount of heat, the heat is often conducted to the shell by insulating gas filled in the gas insulated metal closed transmission line, so that the temperature of the shell at the lap joint is increased, and therefore the temperature rise of the shell at the lap joint of the gas insulated metal closed transmission line is simulated and measured by adopting a certain means, and the detection of the overheating fault at the lap joint of the gas insulated metal closed transmission line is realized. Referring to fig. 1, fig. 1 is a schematic flow chart of a method for detecting an overheating fault at a lap joint of a gas insulated metal enclosed power transmission line in an embodiment, and as shown in fig. 1, the implementation method of the present disclosure specifically includes the following steps:
step 102, establishing a first simulation calculation model of the gas insulated metal closed power transmission line to be tested.
Specifically, the implementation method disclosed by the disclosure does not directly detect the temperature of the actual gas insulated metal enclosed power transmission line, but fits the actual temperature rise by establishing a model and introducing parameters, so that a section to be measured of the gas insulated metal enclosed power transmission line needs to be modeled and used for calculation. For the gas insulated metal closed transmission line, a certain structure is arranged in the gas insulated metal closed transmission line, parts are more, but the influence on the temperature at the lap joint to be conducted to the shell is not large, so that the gas insulated metal closed transmission line can be simplified based on the power conservation of heat generation and heat dissipation in the modeling process, and the established model can comprise the shell and the inner conductor of the gas insulated metal closed transmission line. In one embodiment, the step of establishing the simulation calculation model of the gas-insulated metal closed power transmission line to be tested comprises the following steps: measuring the overall dimension such as length, diameter and the like of the gas insulated metal closed transmission line to be measured, and establishing a simulation calculation model of the gas insulated metal closed transmission line to be measured according to the ratio of the model to the entity 1 by using three-dimensional modeling software such as Pro/E, UG, solidworks, 3Dmax, auto CAD and the like according to the measured data of the overall dimension.
And 104, giving material properties to each part of the first simulation calculation model.
After the simulation calculation model of the gas insulated metal enclosed transmission line is established, certain material attributes such as the ambient temperature, the shell material of the gas insulated metal enclosed transmission line to be measured, boundary conditions at two ends of the gas insulated metal enclosed transmission line and the like need to be given to each part of the model, so that calculation is facilitated.
And 106, measuring the resistance of each section of conductor of the gas insulated metal closed transmission line to be measured and the contact resistance of the lap joint of the conductor.
Specifically, the resistance of the conductor and the contact resistance of the lap joint of the conductor need to be measured so as to calculate and fit the ohmic loss of the to-be-measured section of the whole gas-insulated metal closed power transmission line. In one embodiment, the measuring method of the resistance of the conductor and the contact resistance at the lap joint of the conductor comprises any one of a loop resistance meter measuring method or a double-arm bridge measuring method, wherein the loop resistance meter measuring method adopts a voltammetry method to measure the contact resistance, and is characterized by convenience and rapidness; the double-arm bridge measurement method is characterized in that the measurement accuracy is high, and the method can be selected according to different requirements to measure the resistance of a conductor and the contact resistance of the lap joint of the conductor.
And 108, introducing the resistance of each section of conductor of the gas insulated metal closed transmission line to be detected and the contact resistance of the lap joint of the conductor into a first simulation calculation model endowed with material properties.
And respectively leading the resistance of each section of conductor of the gas insulated metal closed transmission line to be detected and the contact resistance of the conductor lap joint into corresponding parts in the simulation calculation model, namely respectively endowing the detected conductor resistance and the conductor lap joint resistance to each section of conductor and the conductor lap joint of the gas insulated metal closed transmission line to be detected in the simulation calculation model for subsequent calculation.
And step 110, calculating the ohmic loss distribution of the first simulation calculation model according to the introduced conductor resistance and the contact resistance of the conductor lap joint.
Specifically, the distribution of the ohmic loss of the simulation calculation model is calculated and simulated according to the measured data, so in one embodiment, the simulation calculation model needs to be subjected to eddy current field analysis, and the ohmic loss distribution of the gas to be measured of the simulation calculation model is obtained according to the result of the eddy current field analysis and is used as the ohmic loss distribution of the insulated metal closed power transmission line. When the eddy current field analysis is performed on the simulation calculation model, there are many possible calculation modes, but if the selected calculation mode is not good, problems of too large calculation amount, too long calculation time, poor calculation accuracy and the like may occur. Meanwhile, the influence of the eddy current effect and the skin effect on ohmic loss calculation in eddy current field analysis is comprehensively calculated and considered, and the calculation accuracy is further improved.
And 112, introducing a fluid domain condition into the first simulation calculation model without the material attribute, establishing a second simulation calculation model, and endowing the material attribute to each component of the second simulation calculation model.
After the ohmic loss of the simulation calculation model is calculated, the temperature field and the gas flow field of the simulation calculation model also need to be calculated, so that the fluid domain condition needs to be introduced into the model so as to calculate and simulate the actual heat conduction more accurately. Specifically, the created simulation calculation model can be regarded as two parts, namely, the outside and the inside of the gas-insulated metal enclosed transmission line casing model, referring to fig. 2, fig. 2 is a schematic diagram of the simulation calculation model introducing the fluid domain condition in an embodiment, and as shown in fig. 2, the created simulation model 210 of the gas-insulated metal enclosed transmission line includes a casing model 211 and an inner conductor model 212, and in this embodiment, the inside is a three-phase conductor, so that the inner conductor model 212 has three columns, which respectively represent three conductor lines of the three-phase conductor. The outside of the simulation model 210 is regarded as air, and the air block 220 is arranged to cover the outside of the shell model 211 and endow certain air material properties to the air block so as to simulate the heat exchange process between the shell and the external environment. Meanwhile, the part of the inner side of the shell model 211 except the inner conductor model 212 is regarded as insulating gas, an insulating gas block 230 is arranged, and certain insulating gas material properties are given to simulate the heat transfer of the insulating gas; the material property of the insulating gas block 230 here may be set to the material property of the gas filled in the gas-insulated metal enclosed power transmission line to be measured, or to the material property of a gas commonly used in the gas-insulated metal enclosed power transmission line when the filled gas is unclear, in order to improve the accuracy of the calculation simulation. In one embodiment, the selected insulating gas may be one or more of sulfur hexafluoride, nitrogen, a mixture of sulfur hexafluoride and nitrogen. Optionally, when the material properties of the air block 220 and the insulating gas block 230 are given, the pressure property of the external air or the pressure property of the internal insulating gas in the simulation calculation model may be specifically set, so as to further improve the accuracy of the calculation simulation.
And step 114, introducing the ohmic loss serving as a heat source into a second simulation calculation model, and calculating a temperature field and an air flow field of the second simulation calculation model after the heat source is introduced.
After the simulation calculation model has the heat source condition, the fluid domain condition and the material attribute conditions of other parts, the temperature field and the gas flow field of the simulation calculation model can be calculated. Specifically, self-adaptive mesh generation analysis is carried out on a simulation calculation model with fluid domain conditions and component material attributes, and after analysis, calculated ohmic loss is introduced into the simulation calculation model to be used as a heat source to carry out multi-physical-field coupling calculation, so that a temperature field and an air flow field of the simulation calculation model are obtained. In practical situations, the density change of the fluid caused by the heat generation at the lap joint of the gas insulated metal closed power transmission line does not exceed 20%, so that the calculation of buoyancy can be considered by utilizing the Buxinesk approximation in the multi-physical-field coupling calculation process, and the calculation flow is simplified.
In one embodiment, when the temperature field of the simulation calculation model is calculated, the heat transfer modes of heat conduction, heat radiation and heat convection are comprehensively considered and calculated, so that the accuracy of the calculation result is improved. When calculating the heat transfer effect of the thermal radiation, in order to be compatible with the radiation calculation from a small scale to a large scale, the thermal radiation is calculated by adopting a discrete coordinate method.
It can be understood that the rationality and effectiveness of the simulation calculation model directly affect the accuracy of the calculated temperature field distribution of the gas insulated metal enclosed power transmission line, and further affect the accuracy of judging whether the overheating fault at the lap joint of the gas insulated metal enclosed power transmission line is accurate, so that in order to improve the accuracy of the temperature field calculation result, the requirement of multi-physical-field coupling calculation needs to be met by considering the simulation calculation model while the consistency of the simulation calculation model and an entity is met, namely, the temperature divergence is not allowed to occur in the fluid calculation process. Therefore, in one embodiment, when the fluid domain condition is introduced into the simulation calculation model and adaptive mesh generation analysis is performed, the insulating gas block inside the gas-insulated metal closed power transmission line is equivalently set as a solid block, corresponding insulating gas material properties are given to the insulating gas block, and then adaptive mesh generation analysis is performed. After the self-adaptive mesh generation analysis is completed, when the eddy current field calculation of the temperature field and the gas flow field is carried out, the insulating gas block inside the gas-insulated metal closed power transmission line is equivalently set to be gas so as to simulate convection heat transfer and endow the insulating gas block with corresponding insulating gas material properties. In the embodiment, through the arrangement mode, the insulating gas block in the gas-insulated metal closed power transmission line is equivalent to the solid block to perform self-adaptive mesh generation analysis on the simulation calculation model, and is equivalent to the gas block when the temperature field and the gas flow field are calculated, so that the consistency of the simulation calculation model and the entity is compatible, the multi-physical-field coupling calculation required when the temperature field and the gas flow field are calculated can be realized, and the accuracy of the calculation result is effectively improved.
the calculated temperature field and gas flow field of the second simulation calculation model are used as the temperature field and gas flow field of the gas insulated metal closed power transmission line and compared with the temperature field and gas flow field of the gas insulated metal closed power transmission line in a normal state. In the comparison, the calculated temperature field and gas flow field may be introduced into a certain model to facilitate the comparison.
And step 118, when the temperature field and the gas flow field of the second simulation calculation model change beyond a certain threshold value in a normal state, judging that the gas insulated metal enclosed transmission line to be detected has an overheating fault.
Specifically, the data of the temperature field and the gas flow field may be directly compared during the comparison, or may be appropriately quantized and then compared.
Referring to fig. 3, fig. 3 is a schematic diagram illustrating shell temperature comparison of a gas-insulated metal enclosed power transmission line in an embodiment, in the embodiment, a 252kV three-phase common-box type gas-insulated metal enclosed power transmission line is modeled and calculated, where an ambient temperature is set to 25 degrees, a contact resistance in a normal state is set to 2.5 μ Ω, and a contact resistance in a fault state is set to 20 μ Ω. As shown in fig. 3, the left side of the diagram is a quantized temperature field of the case of the gas insulated metal enclosed transmission line with the overheat fault, and the right side of the diagram is a temperature field of the case of the gas insulated metal enclosed transmission line in a normal state. Compared with the gas insulated metal closed power transmission line, the gas insulated metal closed power transmission line in a normal state has lower and stable shell temperature, and each part basically has no temperature difference. The method comprises the steps of setting a certain temperature threshold value by taking the temperature of the shell of the gas insulated metal closed power transmission line in a normal state as a reference, detecting the temperature field of the shell of the gas insulated metal closed power transmission line to be detected, and judging that the gas insulated metal closed power transmission line to be detected has an overheating fault when detecting that the temperature of the shell of the gas insulated metal closed power transmission line to be detected exceeds the certain threshold value.
In an embodiment, before the step of comparing the temperature field and the gas flow field of the second simulation calculation model with the temperature field and the gas flow field of the gas-insulated metal enclosed power transmission line in the normal state, the method further includes calculating the temperature field and the gas flow field of the gas-insulated metal enclosed power transmission line in the normal state, and the specific steps are as follows:
establishing a third simulation calculation model of the gas insulated metal closed power transmission line to be tested;
giving material attributes to each component of the third simulation calculation model, wherein the material attributes are corresponding to each component of the gas insulated metal closed power transmission line to be detected in a normal state;
the resistance of each section of conductor of the gas insulated metal closed transmission line to be detected and the contact resistance of the lap joint of the conductor under the normal state are led into a third simulation calculation model endowed with material properties;
ohmic loss distribution of the third simulation calculation model is calculated according to the introduced conductor resistance and the contact resistance of the conductor lap joint;
introducing a fluid domain condition into a third simulation calculation model without material attributes, establishing a fourth simulation calculation model, and giving material attributes to each component of the fourth simulation calculation model, wherein the material attributes are corresponding to each component of the gas insulated metal enclosed transmission line to be detected in a normal state;
and introducing ohmic loss serving as a heat source into a fourth simulation calculation model, and calculating a temperature field and a gas flow field of the fourth simulation calculation model after the heat source is introduced as the temperature field and the gas flow field of the gas-insulated metal closed power transmission line in a normal state.
Specifically, a simulation calculation model is established for the gas insulated metal enclosed transmission line to be measured, material properties of each component of the gas insulated metal enclosed transmission line to be measured in a normal state are given, and meanwhile, the conductor resistance and the contact resistance of the lap joint of the gas insulated metal enclosed transmission line in a known normal state can be directly led into the simulation calculation model to calculate ohmic loss. And ohmic loss and fluid domain conditions are introduced into a simulation calculation model to calculate a temperature field and an air flow field. In the calculation process, all the introduced parameters and conditions are related parameters of the gas insulated metal closed power transmission line in the normal state, so the calculated temperature field and gas flow field results are the temperature field and the gas flow field of the gas insulated metal closed power transmission line in the normal state.
All possible combinations of the technical features of the above embodiments may not be described for the sake of brevity, but should be considered as within the scope of the present disclosure as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is specific and detailed, but not to be understood as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent should be subject to the appended claims.
Claims (10)
1. A method for detecting an overheating fault at a lap joint of a gas insulated metal closed power transmission line comprises the following steps:
establishing a first simulation calculation model of the gas-insulated metal closed power transmission line to be tested;
giving material attributes to each component of the first simulation calculation model;
measuring the resistance of each section of conductor of the gas insulated metal closed transmission line to be measured and the contact resistance of the lap joint of the conductor;
the resistance of each section of conductor of the gas insulated metal closed transmission line to be detected and the contact resistance of the lap joint of the conductor are led into a first simulation calculation model endowed with material properties;
calculating the ohm loss distribution of the first simulation calculation model according to the introduced conductor resistance and the contact resistance at the conductor lap joint;
introducing a fluid domain condition into the first simulation calculation model without the material attribute, establishing a second simulation calculation model, and giving the material attribute to each component of the second simulation calculation model;
introducing the ohmic loss serving as a heat source into the second simulation calculation model, and calculating a temperature field and an air flow field of the second simulation calculation model after the heat source is introduced;
comparing the temperature field and the gas flow field of the second simulation calculation model with the temperature field and the gas flow field of the gas insulated metal closed power transmission line in a normal state respectively;
and when the temperature field and the gas flow field of the second simulation calculation model change beyond a certain threshold value in a normal state, judging that the gas insulated metal closed power transmission line to be detected has an overheating fault.
2. The method according to claim 1, wherein the method for establishing the first simulation calculation model of the gas-insulated metal enclosed transmission line to be tested comprises the following steps:
measuring the outline dimension of the gas insulated metal closed power transmission line to be measured;
and establishing the first simulation calculation model according to the measured overall dimension data by using three-dimensional modeling software solidworks according to the proportion of the measured overall dimension data to the entity 1.
3. The method of claim 1, wherein the first simulation calculation model comprises a shell model and an inner conductor model of the gas insulated metal enclosed power transmission line.
4. The method of claim 1, wherein the means for measuring the resistance of each section of the conductor of the gas-insulated metal enclosed power transmission line to be measured and the contact resistance at the overlapping part of the conductor comprises at least one of a loop resistance meter measurement method or a double-arm bridge measurement method.
5. The method of claim 1, wherein the step of calculating the ohmic loss distribution of the first simulation calculation model based on the introduced conductor resistance magnitude and the conductor lap contact resistance magnitude comprises:
performing self-adaptive mesh generation on the first simulation calculation model, and performing eddy current field analysis;
and acquiring the ohmic loss distribution of the first simulation calculation model according to the eddy current field analysis result to be used as the ohmic loss distribution of the insulated metal closed power transmission line.
6. The method of claim 3, wherein the steps of introducing fluid domain conditions into a first simulated computational model to which material properties are not assigned, building a second simulated computational model, and assigning material properties to components of the second simulated computational model comprise:
setting air material properties outside a shell model of the gas insulated metal closed transmission line, and establishing an air domain;
and arranging insulating gas material attributes including one or more of sulfur hexafluoride, nitrogen and mixed gas of sulfur hexafluoride and nitrogen in the shell model of the gas-insulated metal closed transmission line to establish an insulating gas domain.
7. The method of claim 6, wherein said step of introducing said ohmic losses as a heat source into said second simulation calculation model and calculating a temperature field and a gas flow field of said second simulation calculation model after introduction of said heat source comprises:
performing self-adaptive mesh generation analysis on the second simulation calculation model;
introducing the ohmic loss serving as a heat source into a second simulation calculation model after the self-adaptive mesh generation analysis;
and calculating the temperature field and the gas flow field of the second simulation calculation model after the heat source is introduced.
8. The method of claim 7, wherein the step of performing an adaptive meshing analysis on the second simulated computational model comprises:
the insulating gas material in the gas-insulated metal closed power transmission line in the second simulation calculation model is equivalent to a solid block, and corresponding attributes of the insulating gas material are given;
and carrying out self-adaptive mesh generation on the second simulation calculation model.
9. The method of claim 8, wherein the step of calculating the temperature and gas flow fields of the second simulated computational model after the introduction of the heat source comprises:
performing solid equivalence on an insulating gas material in the gas-insulated metal closed power transmission line in the second simulation calculation model after the self-adaptive mesh generation analysis to form a gas, and endowing the insulating gas material with corresponding properties;
and calculating the eddy current field by self-adaptive mesh subdivision analysis, comprehensively considering heat transfer modes of heat conduction, heat radiation and heat convection, calculating the heat radiation by using a discrete coordinate method, and acquiring the temperature field and the gas flow field of the second simulation calculation model.
10. The method according to claim 1, wherein the step of comparing the temperature field and the gas flow field of the second simulation calculation model with the temperature field and the gas flow field of the gas insulated metal enclosed power transmission line in a normal state respectively further comprises:
establishing a third simulation calculation model of the gas-insulated metal closed power transmission line to be tested;
giving material attributes to each component of the third simulation calculation model, wherein the material attributes are corresponding to each component of the gas insulated metal enclosed transmission line to be detected in a normal state;
the resistance of each section of conductor of the gas insulated metal closed transmission line to be detected and the contact resistance of the lap joint of the conductor under the normal state are led into a third simulation calculation model endowed with material properties;
ohmic loss distribution of the third simulation calculation model is calculated according to the introduced conductor resistance and the contact resistance of the conductor lap joint;
introducing a fluid domain condition into a third simulation calculation model without material attributes, establishing a fourth simulation calculation model, and giving material attributes to each component of the fourth simulation calculation model, wherein the material attributes are corresponding to each component of the gas insulated metal enclosed transmission line to be detected in a normal state;
and introducing the ohmic loss serving as a heat source into the fourth simulation calculation model, and calculating a temperature field and a gas flow field of the fourth simulation calculation model after the heat source is introduced as the temperature field and the gas flow field of the gas-insulated metal closed power transmission line in a normal state.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107561397A (en) * | 2017-08-10 | 2018-01-09 | 广州供电局有限公司 | The electric contact state detection method and system of GIS contact systems |
| CN108052697A (en) * | 2017-11-18 | 2018-05-18 | 西安交通大学 | A kind of corridor pipe GIL three-dimensional temperature fields and breathing deformation calculation method based on workbench |
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| CN107561397A (en) * | 2017-08-10 | 2018-01-09 | 广州供电局有限公司 | The electric contact state detection method and system of GIS contact systems |
| CN108052697A (en) * | 2017-11-18 | 2018-05-18 | 西安交通大学 | A kind of corridor pipe GIL three-dimensional temperature fields and breathing deformation calculation method based on workbench |
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| 直埋式气体绝缘输电线路温升计算及监测方法的研究;张扬;《铁道勘测与设计》;20170515(第02期);全文 * |
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