CN113945814B - GIL insulator internal temperature field on-line monitoring method - Google Patents
GIL insulator internal temperature field on-line monitoring method Download PDFInfo
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- CN113945814B CN113945814B CN202111319845.3A CN202111319845A CN113945814B CN 113945814 B CN113945814 B CN 113945814B CN 202111319845 A CN202111319845 A CN 202111319845A CN 113945814 B CN113945814 B CN 113945814B
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- 239000012212 insulator Substances 0.000 title claims abstract description 106
- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000012544 monitoring process Methods 0.000 title claims description 28
- 230000008878 coupling Effects 0.000 claims abstract description 25
- 238000010168 coupling process Methods 0.000 claims abstract description 25
- 238000005859 coupling reaction Methods 0.000 claims abstract description 25
- 210000001015 abdomen Anatomy 0.000 claims abstract description 10
- 230000007547 defect Effects 0.000 claims abstract description 8
- 239000000523 sample Substances 0.000 claims abstract description 6
- 239000000853 adhesive Substances 0.000 claims description 7
- 230000001070 adhesive effect Effects 0.000 claims description 7
- 238000004088 simulation Methods 0.000 abstract 1
- 230000005540 biological transmission Effects 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 208000028659 discharge Diseases 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
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- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000007619 statistical method Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
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Abstract
The method comprises the steps that a plurality of temperature sensors are adhered to the column legs and the belly surface of a three-column insulator, the three-column insulator is placed in a GIL shell, the temperature sensors measure temperature data and fit to obtain three-column insulator surface temperature distribution, an electrothermal coupling model of the three-column insulator is built, the temperature distribution is used as a boundary condition to be input into the electrothermal coupling model for solving, a domain point probe is arranged in the insulator to obtain three-column insulator internal temperature field distribution, the insulator internal temperature field distribution is obtained by simulation based on the electrothermal coupling model under normal working conditions and defect conditions respectively to build a database and set a temperature threshold value, and if the temperature in the three-column insulator is monitored to exceed the temperature threshold value during GIL operation, faults are judged to occur, otherwise, the faults do not occur.
Description
Technical Field
The invention belongs to the technical field of electric equipment insulation, and particularly relates to an online monitoring method for an internal temperature field of a GIL insulator.
Background
The Gas insulated power transmission line (Gas-Insulated Transmission Line, GIL) is a metal enclosed long-distance power transmission device, generally adopts SF6 Gas or mixed Gas thereof as insulation, has the advantages of small loss, high reliability, environmental friendliness and the like, and is increasingly widely applied to the power transmission field. Statistical analysis shows that the insulator faults occupy a considerable proportion in the GIL faults, and are the weakest insulating links in the GIL system, so that the working state of the insulator faults needs to be monitored to ensure the safe operation of the system.
The traditional monitoring method mainly utilizes a thermal imager or a temperature sensor to measure the surface temperature field of the insulator, and judges that the fault occurs when the temperature exceeds a threshold value. However, the insulator may have air gaps and other defects due to the technical problems, and the electric discharge occurs under the action of an electric field, so that generated heat is weak to the surface, and the temperature change measured on the surface of the insulator may be lower than a threshold value due to the influence of external environment. This results in the development of discharge channels caused by internal defects of the insulator being ignored, affecting the safe operation of GIL. Therefore, it is necessary to design a GIL insulator internal temperature field monitoring method to improve the sensitivity and accuracy of insulator fault judgment.
The above information disclosed in the background section is only for enhancement of understanding of the background of the invention and therefore may contain information that does not form the prior art that is already known to a person of ordinary skill in the art.
Disclosure of Invention
The invention aims to provide an on-line monitoring method for an internal temperature field of a GIL insulator, which adopts a temperature sensor to obtain the distribution of the temperature field on the surface of the insulator, and obtains the distribution of the temperature field in the insulator by establishing and solving a multi-physical field coupling model. And comparing the obtained data with data under normal working conditions, judging the working state of the insulator, and improving the operation reliability of the GIL.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention discloses an on-line monitoring method for an internal temperature field of a GIL insulator, which comprises the following steps:
a first step, a plurality of temperature sensors are adhered to the surfaces of the column legs and the abdomen of the three-column insulator, the three-column insulator is placed in the GIL shell,
a second step, a plurality of temperature sensors measure temperature data and fit to obtain the surface temperature distribution of the three-pillar insulator,
thirdly, establishing an electrothermal coupling model of the three-post insulator, inputting the temperature distribution as boundary conditions into the electrothermal coupling model for solving, setting a domain point probe in the insulator to obtain internal temperature field distribution of the three-post insulator, respectively simulating to obtain internal temperature field distribution of the insulator under normal working conditions and defect conditions based on the electrothermal coupling model to establish a database and set a temperature threshold, and judging that a fault occurs if the internal temperature of the three-post insulator is monitored to exceed the temperature threshold during GIL operation, otherwise, judging that the fault does not occur.
In the first step, a plurality of temperature sensors are uniformly arranged on the column legs and the belly surface of the three-column insulator in an array manner.
In the GIL insulator internal temperature field on-line monitoring method, the temperature sensor comprises a patch type thermistor.
In the on-line monitoring method for the internal temperature field of the GIL insulator, a plurality of temperature sensors are adhered to the surfaces of the three-post insulator by adhesive.
In the on-line monitoring method of the internal temperature field of the GIL insulator, the bonding glue is heat-conducting glue.
In the GIL insulator internal temperature field on-line monitoring method, the temperature sensor is arranged on the surface of the three-post insulator.
In the GIL insulator internal temperature field on-line monitoring method, the electrothermal coupling model is a multi-physical field coupling model.
In the technical scheme, the online monitoring method for the internal temperature field of the GIL insulator has the following beneficial effects: according to the on-line monitoring method for the internal temperature field of the GIL insulator, the temperature sensor is arranged on the surface of the post insulator, so that the surface temperature of the three-post insulator can be accurately measured under the operating condition, the internal temperature field distribution of the insulator can be obtained by taking the multi-physical field coupling model, the internal temperature of the GIL three-post insulator is monitored, and the fault recognition sensitivity and the system operation reliability are improved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present invention, and other drawings may be obtained according to these drawings for a person having ordinary skill in the art.
FIG. 1 is a schematic layout diagram of an on-line monitoring method for internal temperature field of GIL insulator in the invention;
FIG. 2 is a top view of a post insulator post leg bonded to a temperature sensor;
fig. 3 is a schematic diagram of fault recognition of the online monitoring method of the temperature field inside the GIL insulator.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to fig. 1 to 3 of the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, based on the embodiments of the invention, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the invention.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, based on the embodiments of the invention, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the invention.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
In order to make the technical scheme of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the accompanying drawings. As shown in fig. 1 to 3, an on-line monitoring method for an internal temperature field of a GIL insulator includes,
a first step, a plurality of temperature sensors are adhered to the surfaces of the column legs and the abdomen of the three-column insulator, the three-column insulator is placed in the GIL shell,
a second step, a plurality of temperature sensors measure temperature data and fit to obtain the surface temperature distribution of the three-pillar insulator,
thirdly, establishing an electrothermal coupling model of the three-post insulator, inputting the temperature distribution as boundary conditions into the electrothermal coupling model for solving, setting a domain point probe in the insulator to obtain internal temperature field distribution of the three-post insulator, respectively simulating to obtain internal temperature field distribution of the insulator under normal working conditions and defect conditions based on the electrothermal coupling model to establish a database and set a temperature threshold, and judging that a fault occurs if the internal temperature of the three-post insulator is monitored to exceed the temperature threshold during GIL operation, otherwise, judging that the fault does not occur.
In the preferred embodiment of the online monitoring method for the internal temperature field of the GIL insulator, in the first step, a plurality of temperature sensors are uniformly arranged on the column legs and the belly surface of the three-column insulator in an array manner.
In a preferred embodiment of the method for on-line monitoring the internal temperature field of the GIL insulator, the temperature sensor comprises a patch thermistor.
In the preferred implementation mode of the GIL insulator internal temperature field on-line monitoring method, a plurality of temperature sensors are adhered to the surfaces of the three-post insulators by adhesive.
In a preferred embodiment of the method for online monitoring the internal temperature field of the GIL insulator, the adhesive is a heat-conducting adhesive.
In a preferred embodiment of the online monitoring method for the internal temperature field of the GIL insulator, the temperature sensor is arranged on the inner wall of the three-post insulator.
In a preferred embodiment of the online monitoring method for the internal temperature field of the GIL insulator, the electrothermal coupling model is a multi-physical field coupling model.
In one embodiment, the method includes,
acquiring temperature data of the column legs and the abdomen surface of the three-column insulator by a temperature sensor, and fitting to obtain the temperature distribution of the surface of the three-column insulator;
establishing an electric and thermal coupling model of the three-pillar insulator, inputting the obtained three-pillar insulator surface temperature distribution into the model as a boundary condition for solving, and setting a domain point probe in the insulator to obtain the internal temperature field distribution condition of the insulator;
and respectively simulating to obtain the distribution conditions of the internal temperature fields of the insulators under the normal working condition and various defect conditions, establishing a database for comparison, and setting a temperature threshold value. And when the GIL operates, if the internal temperature of the three-post insulator is monitored to exceed a threshold value, judging that the fault occurs, and otherwise, judging that the fault does not occur.
The temperature sensor is adopted to obtain the temperature field distribution on the surface of the insulator, and the temperature field distribution inside the insulator is obtained by establishing a multi-physical field coupling model and solving the multi-physical field coupling model. And comparing the obtained data with data under normal working conditions, judging the working state of the insulator, and improving the operation reliability of the GIL.
The temperature sensor obtains temperature data of the column legs and the abdomen surface of the three-column insulator, and the temperature distribution of the surface of the three-column insulator is obtained by fitting; establishing an electric and thermal coupling model of the three-pillar insulator, inputting the obtained three-pillar insulator surface temperature distribution into the model as a boundary condition for solving, and setting a domain point probe in the insulator to obtain the internal temperature field distribution condition of the insulator; and respectively simulating to obtain the distribution conditions of the internal temperature fields of the insulators under the normal working condition and various defect conditions, establishing a database for comparison, setting a temperature threshold, and judging that the fault occurs or not if the internal temperature of the three-post insulator exceeds the threshold during GIL operation.
In one embodiment, a computing terminal is adopted to fit the measured temperature data, a finite element model is established, and the distribution condition of the temperature field inside the insulator is obtained through solving.
In one embodiment, a plurality of PT100 temperature sensors are provided on the three post insulator post legs and the belly surface.
Finally, it should be noted that: the described embodiments are intended to be illustrative of only some, but not all, of the embodiments disclosed herein and, based on the embodiments disclosed herein, all other embodiments that may be made by those skilled in the art without the benefit of the teachings herein are intended to be within the scope of this application.
While certain exemplary embodiments of the present invention have been described above by way of illustration only, it will be apparent to those of ordinary skill in the art that modifications may be made to the described embodiments in various different ways without departing from the spirit and scope of the invention. Accordingly, the drawings and description are to be regarded as illustrative in nature and not as restrictive of the scope of the invention, which is defined by the appended claims.
Claims (5)
1. The on-line monitoring method for the internal temperature field of the GIL insulator is characterized by comprising the following steps of:
a first step, a plurality of temperature sensors are adhered to the surfaces of the column legs and the abdomen of the three-column insulator, the three-column insulator is placed in the GIL shell,
a second step, a plurality of temperature sensors measure temperature data and fit to obtain the surface temperature distribution of the three-pillar insulator,
thirdly, establishing an electrothermal coupling model of the three-pillar insulator, wherein the electrothermal coupling model is a multi-physical field coupling model; and the surface temperature distribution of the three-post insulator is used as a boundary condition to be input into an electrothermal coupling model for solving, a domain point probe is arranged in the insulator to obtain the internal temperature distribution of the three-post insulator, the internal temperature distribution of the insulator is respectively simulated and obtained under the normal working condition and the defect condition based on the electrothermal coupling model to establish a database and set a temperature threshold value, when the GIL operates, the surface temperature distribution of the insulator is obtained by adopting a temperature sensor, the internal temperature distribution of the insulator is obtained by solving through a multi-physical field coupling model, and if the internal temperature of the three-post insulator exceeds the temperature threshold value, the occurrence of faults is judged, and otherwise, the occurrence of the faults is not judged.
2. The online monitoring method of the internal temperature field of the GIL insulator of claim 1, wherein in the first step, the plurality of temperature sensors are uniformly arranged on the column legs and the belly surface of the three-column insulator in an array.
3. The GIL insulator internal temperature field on-line monitoring method of claim 1, wherein the temperature sensor comprises a chip thermistor.
4. The online monitoring method of the internal temperature field of the GIL insulator of claim 1, wherein the plurality of temperature sensors are adhered to the surface of the three-post insulator by adhesive.
5. The online monitoring method of the internal temperature field of the GIL insulator of claim 4, wherein the adhesive is a heat conductive adhesive.
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| CN202111319845.3A CN113945814B (en) | 2021-11-09 | 2021-11-09 | GIL insulator internal temperature field on-line monitoring method |
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| CN202111319845.3A CN113945814B (en) | 2021-11-09 | 2021-11-09 | GIL insulator internal temperature field on-line monitoring method |
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