CN112393817B - Capacitive temperature sensor integrated in high-voltage bushing and high-voltage bushing - Google Patents
Capacitive temperature sensor integrated in high-voltage bushing and high-voltage bushing Download PDFInfo
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- CN112393817B CN112393817B CN202011147656.8A CN202011147656A CN112393817B CN 112393817 B CN112393817 B CN 112393817B CN 202011147656 A CN202011147656 A CN 202011147656A CN 112393817 B CN112393817 B CN 112393817B
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- capacitive
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- temperature sensing
- temperature
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/34—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using capacitative elements
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/16—Conversion of dc power input into dc power output without intermediate conversion into ac by dynamic converters
- H02M3/18—Conversion of dc power input into dc power output without intermediate conversion into ac by dynamic converters using capacitors or batteries which are alternately charged and discharged, e.g. charged in parallel and discharged in series
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- Power Engineering (AREA)
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- General Physics & Mathematics (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Abstract
The invention relates to a capacitive temperature sensing element integrated in a high-voltage sleeve and the high-voltage sleeve, wherein the temperature sensing element can be directly contacted with a copper rod of the high-voltage sleeve, is not easily affected by environment and has high stability; the capacitance structure formed by the polar plate and the temperature sensing medium has high linearity of capacitance value along with temperature change and good temperature sensing performance; meanwhile, by adopting a capacitance type structure, the electrode can take electricity by utilizing the electric field induction of the copper rod, so that the later-stage signal processing is facilitated; the electrode adopts a circular ring structure, and the electrode can be used for replacing a shielding net by matching a temperature sensing medium, so that the cost is reduced.
Description
Technical Field
The invention relates to the technical field related to switching equipment, in particular to a capacitive temperature-sensitive element integrated in a high-voltage sleeve and the high-voltage sleeve.
Background
The high-voltage bushing for the switchgear is part of the main through-flow circuit, the acquisition of its operating state being critical for the power system. The temperature reflects the heating condition inside the bushing, and can be used as an important parameter for evaluating the running state of the high-voltage bushing.
The current temperature detection device for the high-voltage sleeve is mainly of a surface belt type and a blocking head type. The surface belt type device cannot directly contact a heat source of the sleeve, namely the copper rod, is easily affected by the environment and is inaccurate in measurement; the plug type device can directly contact the copper rod, but has the problem of partial discharge.
Disclosure of Invention
Based on the above situation in the prior art, the invention aims to provide a capacitive temperature sensing element integrated in a high-voltage sleeve, and the temperature sensing element can be directly contacted with a copper rod of the sleeve, is little influenced by environmental factors and has high stability; the capacitance structure formed by the polar plate and the temperature sensing medium has high linearity of capacitance value along with temperature change and good temperature sensing performance, and well overcomes the defects of the temperature detection device of the high-voltage sleeve in the prior art.
To achieve the above object, according to one aspect of the present invention, there is provided a capacitive temperature sensing element integrated in a high voltage bushing, the capacitive temperature sensing element comprising a capacitive temperature sensing element body and a lead-out terminal 2; wherein, the liquid crystal display device comprises a liquid crystal display device,
the capacitive temperature sensitive element body is of an annular structure, sleeved on the outer side of the copper rod 3 of the high-voltage sleeve and concentrically arranged in the high-voltage sleeve with the copper rod 3;
the capacitive temperature sensitive element body comprises a first electrode 11 and a temperature sensing medium 12 which are in annular structures, the first electrode 11 is arranged on the outer side of the temperature sensing medium 12, the first electrode 11, the temperature sensing medium 12 and the copper rod 3 form a capacitive structure, and the outer side of the first electrode 11 is connected with one end of the leading-out end 2.
Further, the capacitive temperature sensing element body further includes a second electrode 13 with a ring structure and a buffer substance 14, the second electrode 13 is disposed on the inner side of the temperature sensing medium 12, the buffer substance 14 is disposed between the second electrode 13 and the copper rod 3, and the first electrode 11, the temperature sensing medium 12 and the second electrode 13 form a capacitive structure.
Further, the first electrode 11 and the lead-out terminal 2 are both electric conductors, and the temperature sensing medium 12 is a ceramic material.
Further, the first electrode 11, the second electrode 13 and the lead-out terminal 2 are all electric conductors, the temperature sensing medium 12 is a ceramic material, and the buffer substance 14 is a soft material.
Further, the annular structure of the capacitive temperature sensing element body is a closed curved surface or a non-closed curved surface.
Further, the other end of the leading-out end 2 extends to the outside of the high-voltage sleeve to be connected with a temperature measuring device.
Further, the capacitive temperature sensing element is integrally arranged in the high-voltage sleeve.
Further, the capacitive temperature sensing element body is arranged on any side of the high-voltage sleeve shielding net 4.
Further, the capacitive temperature sensing element body is disposed at the position of the high-voltage bushing shielding net 4 and is disposed in place of the shielding net 4.
According to another aspect of the present invention there is provided a high voltage bushing comprising a capacitive temperature sensing element as described in the first aspect of the invention as described above, said capacitive temperature sensing element being integrated in said high voltage bushing
In summary, the invention provides a capacitive temperature sensing element integrated in a high-voltage sleeve, which adopts a capacitive structure, so that the temperature sensing element can be directly contacted with a copper rod of the sleeve, the linearity of the capacitance value of the capacitive structure formed by a polar plate and a temperature sensing medium along with the change of temperature is high, and an electrode can utilize the electric field of the copper rod to induce electricity. The technical scheme of the invention has the following beneficial technical effects:
(1) The temperature sensitive element can be directly contacted with the copper rod of the sleeve, and the stability is high.
(2) The capacitance structure formed by the polar plate and the temperature sensing medium has high linearity of capacitance value along with temperature change and good temperature sensing performance.
(3) By adopting a capacitance structure, the electrode can utilize copper bar electric field induction to take electricity, so that signal processing is facilitated.
(4) If the electrode adopts a curved surface closed annular structure, a shielding net can be replaced through parameter matching and structural design, so that the cost is reduced.
Drawings
FIG. 1 is a schematic diagram of an embodiment 1 of a capacitive temperature sensitive element integrated in a high voltage bushing according to the present invention; FIG. 1-a) is a schematic structural diagram of a scheme employing curved closure; FIG. 1-b) is a schematic structural diagram of a non-closed scheme employing curved surfaces;
FIG. 2 is a schematic diagram of an embodiment 2 of a capacitive temperature sensitive element integrated in a high voltage bushing according to the present invention; FIG. 2-a) is a schematic structural diagram of a scheme employing curved closure; FIG. 2-b) is a schematic structural diagram of a non-closed scheme employing curved surfaces;
FIG. 3 is a cross-sectional view of the capacitive temperature sensing element integrated into a high voltage bushing of the present invention disposed on one side of a shielding mesh;
fig. 4 is a cross-sectional view of the capacitive temperature sensitive element of the present invention integrated into a high voltage bushing positioned at the location of a shielding mesh.
Detailed Description
The objects, technical solutions and advantages of the present invention will become more apparent by the following detailed description of the present invention with reference to the accompanying drawings. It should be understood that the description is only illustrative and is not intended to limit the scope of the invention. In addition, in the following description, descriptions of well-known structures and techniques are omitted so as not to unnecessarily obscure the present invention.
In the following, the technical solution of the present invention is described in detail, and according to embodiment 1 of the present invention, there is provided a capacitive temperature sensor integrated in a high voltage bushing, the capacitive temperature sensor is suitable for a high voltage switchgear, and a schematic structural diagram of embodiment 1 is shown in fig. 1. The capacitive temperature sensing element comprises a capacitive temperature sensing element body and a leading-out end 2. The high-voltage bushing is an epoxy resin casting in which copper bars 3 and a shielding net 4 are arranged. The capacitor temperature sensor body of this embodiment 1 is of an annular structure, is sleeved on the outer side of the copper rod 3 of the high-voltage sleeve, and is concentrically integrated with the copper rod 3 and disposed in the high-voltage sleeve, where the concentric arrangement means that the centers of the copper rod and the annular structure coincide within the allowable range of the process. The stability of the temperature sensitive element is improved due to the fact that the temperature sensitive element is directly contacted with the copper rod 3 of the high-voltage sleeve.
The capacitive temperature sensitive element body comprises a first electrode 11 and a temperature sensing medium 12, wherein the first electrode 11 is arranged on the outer side of the temperature sensing medium 12, the first electrode 11 and the leading-out end 2 can be arranged as conductors, electricity can be taken from the copper rod 3 in an induction mode to meet the power supply requirement of the temperature measuring device, and the temperature sensing medium 12 can be arranged as a ceramic material. The first electrode 11, the temperature sensing medium 12 and the copper rod 3 form a capacitance structure, the outer side of the first electrode 11 is connected with one end of the leading-out end 2, and the other end of the leading-out end 2 extends to the outside of the high-voltage sleeve so as to be connected with a temperature measuring device. Through the arrangement of the capacitive structure, the capacitance value of the capacitive structure is high in linearity along with temperature change, the temperature sensing performance is good, meanwhile, the electrode can utilize copper rod electric field induction to take electricity, and later-stage signal processing is facilitated. The annular structure of the capacitive temperature sensitive element body can be a closed curved surface or a non-closed curved surface. The structure schematic diagram of the annular structure with a closed curved surface is shown in fig. 1-a), and the structure schematic diagram of the annular structure with a non-closed curved surface is shown in fig. 1-b).
According to embodiment 2 of the present invention, there is provided a capacitive temperature sensitive element integrated in a high voltage bushing, the capacitive temperature sensitive element being suitable for use in a high voltage switchgear, the schematic structure of embodiment 2 being shown in fig. 2. The capacitive temperature sensing element comprises a capacitive temperature sensing element body and a leading-out end 2. The high-voltage bushing is an epoxy resin casting in which copper bars 3 and a shielding net 4 are arranged. The capacitor temperature sensor body of this embodiment 1 is of an annular structure, is sleeved on the outer side of the copper rod 3 of the high-voltage sleeve, and is concentrically integrated with the copper rod 3 and disposed in the high-voltage sleeve, where the concentric arrangement means that the centers of the copper rod and the annular structure coincide within the allowable range of the process. The stability of the temperature sensitive element is improved due to the fact that the temperature sensitive element is directly contacted with the copper rod 3 of the high-voltage sleeve.
The capacitive temperature-sensitive element body comprises a first electrode 11, a temperature-sensitive medium 12, a second electrode 13 and a buffer substance 14, wherein the first electrode 11 is arranged on the outer side of the temperature-sensitive medium 12, the second electrode 13 is arranged on the inner side of the temperature-sensitive medium 12, and the buffer substance 14 is arranged between the second electrode 13 and the copper rod 3. The first electrode 11, the second electrode 13 and the leading-out terminal 2 can be arranged as electric conductors, and can be used for inducing electricity from the copper rod 3 to meet the power supply requirement of the temperature measuring device, the temperature sensing medium 12 can be arranged as ceramic materials, and the buffer substance 14 can be arranged as soft materials.
In this embodiment 2, a capacitive structure may be formed by the first electrode 11, the temperature sensing medium 12, and the second electrode 13, and the outer side of the first electrode 11 is connected to one end of the lead-out terminal 2, and the other end of the lead-out terminal 2 extends to the outside of the high-voltage bushing to be connected to a temperature measuring device. Through the arrangement of the capacitive structure, the capacitance value of the capacitive structure is high in linearity along with temperature change, the temperature sensing performance is good, meanwhile, the electrode can utilize copper rod electric field induction to take electricity, and later-stage signal processing is facilitated. The annular structure of the capacitive temperature sensitive element body can be a closed curved surface or a non-closed curved surface. The schematic structure of the annular structure with a closed curved surface is shown in fig. 2-a), and the schematic structure of the annular structure with a non-closed curved surface is shown in fig. 2-b).
According to some embodiments, the capacitive temperature sensitive element body may be arranged on either side of the high voltage bushing screen 4, as shown in the cross-section of fig. 3. Alternatively, the capacitive temperature sensing element body may also be disposed at the position where the high-voltage bushing shielding net 4 is located, and may be disposed instead of the shielding net 4, that is, in this embodiment, the conventional shielding net 4 may be omitted through parameter matching and structural design, so as to reduce design and manufacturing costs. A cross-sectional view of this embodiment is shown in fig. 4.
In summary, the invention relates to a capacitive temperature sensing element integrated in a high-voltage sleeve, wherein the temperature sensing element can be directly contacted with a copper rod of the high-voltage sleeve, is not easily affected by environment, and has high stability; the capacitance structure formed by the polar plate and the temperature sensing medium has high linearity of capacitance value along with temperature change and good temperature sensing performance; meanwhile, by adopting a capacitance type structure, the electrode can take electricity by utilizing the electric field induction of the copper rod, so that the later-stage signal processing is facilitated; the electrode adopts a circular ring structure, and the electrode can be used for replacing a shielding net by matching a temperature sensing medium, so that the cost is reduced.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explanation of the principles of the present invention and are in no way limiting of the invention. Accordingly, any modification, equivalent replacement, improvement, etc. made without departing from the spirit and scope of the present invention should be included in the scope of the present invention. Furthermore, the appended claims are intended to cover all such changes and modifications that fall within the scope and boundary of the appended claims, or equivalents of such scope and boundary.
Claims (10)
1. A capacitive temperature sensing element integrated in a high voltage bushing, characterized in that the capacitive temperature sensing element comprises a capacitive temperature sensing element body and a lead-out terminal (2); wherein, the liquid crystal display device comprises a liquid crystal display device,
the capacitive temperature sensitive element body is of an annular structure, sleeved on the outer side of a copper rod (3) of the high-voltage sleeve and concentrically arranged in the high-voltage sleeve with the copper rod (3);
the capacitive temperature sensitive element body comprises a first electrode (11) and a temperature sensing medium (12) which are of annular structures, the first electrode (11) is arranged on the outer side of the temperature sensing medium (12), the first electrode (11), the temperature sensing medium (12) and the copper rod (3) form a capacitive structure, and the outer side of the first electrode (11) is connected with one end of the leading-out end (2);
the first electrode (11) and the leading-out end (2) are electric conductors, and can be used for inducing electricity from the copper rod (3).
2. The capacitive temperature-sensitive element according to claim 1, wherein the capacitive temperature-sensitive element body further comprises a second electrode (13) of an annular structure and a buffer substance (14), the second electrode (13) is disposed on the inner side of the temperature-sensitive medium (12), the buffer substance (14) is disposed between the second electrode (13) and the copper bar (3), and the first electrode (11), the temperature-sensitive medium (12) and the second electrode (13) form a capacitive structure.
3. Capacitive temperature-sensitive element according to claim 1, characterized in that the temperature-sensitive medium (12) is a ceramic material.
4. The capacitive temperature sensor according to claim 2, wherein the first electrode (11), the second electrode (13) and the lead-out terminal (2) are all electrical conductors, the temperature sensing medium (12) is a ceramic material, and the buffer substance (14) is a soft material.
5. The capacitive temperature sensing element of claim 3 or 4, wherein the annular structure of the capacitive temperature sensing element body is a closed curved surface or a non-closed curved surface.
6. A capacitive temperature sensitive element according to claim 5, characterized in that the other end of the outlet (2) extends outside the high voltage bushing for connection to a temperature measuring device.
7. The capacitive temperature sensing element of claim 6, wherein said capacitive temperature sensing element is integrally disposed within an interior of said high voltage bushing.
8. Capacitive temperature-sensitive element according to claim 7, characterized in that the capacitive temperature-sensitive element body is arranged on either side of the high-voltage bushing screen (4).
9. The capacitive temperature-sensitive element according to claim 7, characterized in that the capacitive temperature-sensitive element body is arranged at the location of the high-voltage bushing shielding net (4) and is arranged instead of the shielding net (4).
10. A high voltage bushing comprising a capacitive temperature sensitive element according to any of claims 1-9, characterized in that the capacitive temperature sensitive element is integrated in the high voltage bushing.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011147656.8A CN112393817B (en) | 2020-10-23 | 2020-10-23 | Capacitive temperature sensor integrated in high-voltage bushing and high-voltage bushing |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011147656.8A CN112393817B (en) | 2020-10-23 | 2020-10-23 | Capacitive temperature sensor integrated in high-voltage bushing and high-voltage bushing |
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| CN112393817A CN112393817A (en) | 2021-02-23 |
| CN112393817B true CN112393817B (en) | 2023-05-02 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100680173B1 (en) * | 2004-09-03 | 2007-02-08 | 삼성전자주식회사 | Capacitive type temperature sensor |
| CN102620855B (en) * | 2012-03-30 | 2015-07-22 | 华南理工大学 | Method and system for measuring polymer melt temperature field based on capacitance tomography |
| CN104267235B (en) * | 2014-09-01 | 2017-09-29 | 珠海许继电气有限公司 | A kind of annular voltage sensing device |
| JP2017534873A (en) * | 2014-10-30 | 2017-11-24 | スリーエム イノベイティブ プロパティズ カンパニー | Capacitive temperature detection of electrical conductors |
| CN104848960B (en) * | 2014-12-02 | 2017-10-13 | 重庆斯凯力科技有限公司 | Capacitive temperature sensor |
| CN204832323U (en) * | 2015-08-03 | 2015-12-02 | 厦门业盛电气有限公司 | Respond to bi -pass sleeve pipe outward |
| CN110567607B (en) * | 2019-01-07 | 2020-12-29 | 京东方科技集团股份有限公司 | Temperature sensor, signal acquisition circuit and temperature detection device |
| CN111351596B (en) * | 2020-04-21 | 2021-06-04 | 上海无线电设备研究所 | Capacitance type sensor for measuring temperature |
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