CN117031139A - Device for simulating continuous aging of uneven electric field of oilpaper insulating material - Google Patents
Device for simulating continuous aging of uneven electric field of oilpaper insulating material Download PDFInfo
- Publication number
- CN117031139A CN117031139A CN202211332736.XA CN202211332736A CN117031139A CN 117031139 A CN117031139 A CN 117031139A CN 202211332736 A CN202211332736 A CN 202211332736A CN 117031139 A CN117031139 A CN 117031139A
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- Prior art keywords
- electric field
- insulating material
- uneven electric
- copper rod
- simulating
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- 230000005684 electric field Effects 0.000 title claims description 69
- 230000032683 aging Effects 0.000 title claims description 51
- 239000011810 insulating material Substances 0.000 title claims description 44
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 49
- 229910052802 copper Inorganic materials 0.000 claims abstract description 49
- 239000010949 copper Substances 0.000 claims abstract description 49
- 229910001220 stainless steel Inorganic materials 0.000 claims description 18
- 239000010935 stainless steel Substances 0.000 claims description 18
- 229920001342 Bakelite® Polymers 0.000 claims description 6
- 239000004637 bakelite Substances 0.000 claims description 6
- 238000009826 distribution Methods 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 239000012774 insulation material Substances 0.000 claims 2
- 238000009413 insulation Methods 0.000 description 7
- 230000008901 benefit Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000001125 extrusion Methods 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 230000035882 stress Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
Classifications
-
- 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
- G01R31/003—Environmental or reliability tests
-
- 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
- G01R31/1227—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 of components, parts or materials
- G01R31/1263—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 of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Testing Electric Properties And Detecting Electric Faults (AREA)
Abstract
The device comprises a cavity for accommodating transformer oil and a cavity grounded; the insulating paper layer is arranged in the cavity; the grounding electrode is arranged in the cavity and is arranged below the insulating paper layer; the support seat comprises a disc and a plurality of support columns vertically fixed on the edge of the disc, an electrode hole is formed in the center of the disc, and the support columns are supported on the insulating paper layer; the copper rod extends axially and extends out of the cavity through the lead to be connected with the high-voltage power supply, the copper rod is detachably inserted into the electrode hole, the upper limiting piece is detachably sleeved on the copper rod and provided with a detachable fastener to fasten the upper limiting piece on the copper rod at a preset position, the lower limiting piece is sleeved on the copper rod to limit at a second position, and the threaded groove is formed in the bottom end of the copper rod; the electrode tip comprises a threaded joint which is detachably connected with the threaded groove and an arc electrode tip which is connected with the threaded joint.
Description
Technical Field
The invention belongs to the technical field of simulating the electric field aging of an oiled paper insulating material, and particularly relates to a device for simulating the continuous aging of an uneven electric field of the oiled paper insulating material.
Background
Oilpaper insulation is an insulating material widely used in extra-high voltage power equipment. The internal temperature of the extra-high voltage power equipment is very high, the internal electric field is very complex, and the oil paper insulating material is easy to age. Under the inside inhomogeneous electric field of equipment, the oil paper insulation can receive the electric stress of different electric field distributions, and inhomogeneous electric field stress will make oil paper insulation experience ageing of different degree, forms internal defect, leads to the partial discharge in the oil paper insulating material, increases the failure risk of oil paper insulating material. Therefore, the evolution rule simulating the insulation performance of the oil paper in the uneven electric field has important significance for the service life assessment of the insulation of the oil paper.
To date, research under the condition of a non-uniform electric field in ultra-high voltage power equipment is more focused on the influence of intermittent discharge on electrical performance, and continuous discharge under the non-uniform electric field is difficult to control and simulate, so that the evolution rule of continuous discharge under the non-uniform electric field on the insulation performance of oilpaper cannot be effectively explained.
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
Aiming at the problems in the prior art, the invention provides a device for simulating the continuous aging of an uneven electric field of an oilpaper insulating material.
The invention aims at realizing the following technical scheme, and the device for simulating the continuous aging of the uneven electric field of the oilpaper insulating material comprises:
the cavity is used for containing transformer oil and is grounded;
an insulating paper layer arranged in the cavity;
a ground electrode disposed in the cavity and disposed below the insulating paper layer;
the support seat comprises a disc and a plurality of support columns vertically fixed on the edge of the disc, an electrode hole is formed in the center of the disc, and the support columns are supported on the insulating paper layer;
an electrode body, which comprises,
the copper rod extends axially and extends out of the cavity through a lead to be connected with a high-voltage power supply, and the copper rod is detachably inserted into the electrode hole;
the upper limiting piece is detachably sleeved on the copper rod and is provided with a detachable fastening piece so as to fasten the upper limiting piece to the copper rod at a preset position;
the lower limiting piece is sleeved on the copper rod to limit at a second position;
the thread groove is arranged at the bottom end of the copper rod;
the electrode tip comprises a threaded joint detachably connected with the threaded groove and an arc electrode tip connected with the threaded joint.
In the device for simulating the continuous aging of the uneven electric field of the oilpaper insulating material, the electrode tip is an ellipsoidal copper electrode tip.
In the device for simulating the continuous aging of the uneven electric field of the oilpaper insulating material, the ellipsoidal copper electrode tips with different curvature radiuses are detachably connected with the threaded grooves to form different uneven electric field distribution.
In the device for simulating the continuous aging of the uneven electric field of the oilpaper insulating material, the upper limiting part comprises a stainless steel nut, the fastening piece comprises a stainless steel hexagonal screw, and the stainless steel hexagonal screw penetrates into the stainless steel nut to be in extrusion contact with the copper rod.
In the device for simulating continuous aging of the uneven electric field of the oilpaper insulating material, the lower limiting part comprises a plurality of stainless steel nuts.
In the device for simulating the continuous aging of the uneven electric field of the oilpaper insulating material, the disc and the support column are both made of bakelite materials.
In the device for simulating the continuous aging of the uneven electric field of the oilpaper insulating material, the support column is fixed on the upper surface of the disc by a plurality of bakelite nuts.
In the device for simulating the continuous aging of the uneven electric field of the oilpaper insulating material, the upper limiting piece adjusts the distance between the electrode head and the grounding electrode so as to change the intensity of the uneven electric field.
In the device for simulating continuous aging of the uneven electric field of the oilpaper insulating material, the liquid level of the transformer oil is beyond the upper end of the copper rod.
In the device for simulating the continuous aging of the uneven electric field of the oilpaper insulating material, the electrode head is of a semi-ellipsoidal structure.
Compared with the prior art, the invention has the following advantages: the device for simulating the continuous aging of the uneven electric field of the oiled paper insulating material can adjust the intensity and the uneven electric field distribution of the uneven electric field, and can remarkably improve the applicability and the precision of the continuous aging of the uneven electric field of the oiled paper insulating material.
Drawings
Various other advantages and benefits of the present invention will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. It is evident that the figures described below are only some embodiments of the invention, from which other figures can be obtained without inventive effort for a person skilled in the art. Also, like reference numerals are used to designate like parts throughout the figures.
In the drawings:
FIG. 1 is a schematic diagram of a support base structure of a device for simulating non-uniform electric field continuous aging of oilpaper insulating materials;
FIG. 2 is a schematic diagram of the structure of an electrode body of the device for simulating the non-uniform electric field continuous aging of the oilpaper insulating material;
FIG. 3 is a schematic diagram of the electrode tip structure of the device for simulating the non-uniform electric field continuous aging of the oilpaper insulating material;
fig. 4 is a schematic structural diagram of an apparatus for simulating non-uniform electric field continuous aging of oiled paper insulating material according to the present invention.
The invention is further explained below with reference to the drawings and examples.
Detailed Description
Specific embodiments of the present invention will be described in more detail below with reference to fig. 1 to 4. While specific embodiments of the invention are shown in the drawings, it should be understood that the invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
It should be noted that certain terms are used throughout the description and claims to refer to particular components. Those of skill in the art will understand that a person may refer to the same component by different names. The description and claims do not identify differences in terms of components, but rather differences in terms of the functionality of the components. As used throughout the specification and claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. The description hereinafter sets forth a preferred embodiment for practicing the invention, but is not intended to limit the scope of the invention, as the description proceeds with reference to the general principles of the description. The scope of the invention is defined by the appended claims.
For the purpose of facilitating an understanding of the embodiments of the present invention, reference will now be made to the drawings, by way of example, and specific examples of which are illustrated in the accompanying drawings.
For better understanding, in one embodiment, as shown in fig. 1-4, in an apparatus that simulates the continuous aging of a non-uniform electric field of a oiled paper insulating material,
a cavity 11 containing transformer oil and which is grounded;
an insulating paper layer 12 provided in the cavity;
a ground electrode 13 provided in the cavity and placed below the insulating paper layer 12;
the support seat comprises a disc 1 and a plurality of support columns vertically fixed at the edge of the disc 1, an electrode hole 2 is formed in the center of the disc 1, and the support columns are supported on the insulating paper layer 12;
the electrode body 3, which includes,
a copper rod 4 extending axially and extending out of the cavity via a wire to connect to a high voltage power source, the copper rod 4 being removably inserted into the electrode hole 2,
an upper limiting piece 7 detachably sleeved on the copper bar 4, wherein the upper limiting piece 7 is provided with a detachable fastening piece 6 to fasten the upper limiting piece 7 on the copper bar 4 at a preset position,
a lower limiting piece 8 sleeved on the copper bar 4 to limit at a second position,
the thread groove 5 is arranged at the bottom end of the copper rod 4;
and the electrode tip 10 comprises a threaded joint 9 detachably connected with the threaded groove 5 and an arc-shaped electrode tip 10 connected with the threaded joint 9.
In the preferred embodiment of the device for simulating the continuous aging of the uneven electric field of the oilpaper insulating material, the electrode tip 10 is an ellipsoidal copper electrode tip 10.
In the preferred embodiment of the device for simulating the continuous aging of the uneven electric field of the oilpaper insulating material, the ellipsoidal copper electrode tips 10 with different curvature radiuses are detachably connected with the threaded grooves 5 to form different uneven electric field distributions.
In the preferred embodiment of the device for simulating the continuous aging of the uneven electric field of the oilpaper insulating material, the upper limiting piece 7 comprises a stainless steel nut, and the fastening piece 6 comprises a stainless steel hexagonal screw which penetrates into the stainless steel nut to be in extrusion contact with the copper rod 4.
In the preferred embodiment of the device for simulating the continuous aging of the uneven electric field of the oilpaper insulating material, the lower limiting piece 8 comprises a plurality of stainless steel nuts.
In the preferred embodiment of the device for simulating the non-uniform electric field continuous aging of the oilpaper insulating material, the disc 1 and the supporting columns are made of bakelite materials.
In the preferred embodiment of the device for simulating the non-uniform electric field continuous aging of the oilpaper insulating material, a plurality of nuts are used for fixing the support columns on the upper surface of the disc 1.
In the preferred embodiment of the device for simulating the continuous aging of the uneven electric field of the oilpaper insulating material, the upper limiting member 7 adjusts the distance between the electrode tip 10 and the ground electrode 13 to change the uneven electric field intensity. Therefore, partial discharge or breakdown of the oilpaper caused by a long-time uneven electric field can be avoided, and a long-time continuous pressurizing uneven electric field continuous aging experiment of the oilpaper insulating material is realized.
In the preferred embodiment of the device for simulating the continuous aging of the uneven electric field of the oilpaper insulating material, the liquid level of the transformer oil is over the upper end of the copper rod 4.
In the preferred embodiment of the device for simulating the continuous aging of the uneven electric field of the oilpaper insulating material, the electrode tip 10 has a hemispherical structure.
The device can realize continuous aging of the nonuniform electric field and has obvious distinction from the prior intermittent discharge aging. Continuous long-term aging experiments need to avoid the interruption of the experiment caused by partial discharge and breakdown due to a locally non-uniform electric field during long-term pressurization. Therefore, the curvature of the arc-shaped copper electrode tip is reduced relative to the needle-shaped electrode tip, the non-uniformity of the electric field is reduced, and the setting of the upper limiter adjusts the strength of the non-uniform electric field to be critical for continuous aging of the non-uniform electric field.
In one embodiment, the support base comprises a disc 1 and a plurality of support columns at the edge, wherein the edge of the disc 1 is provided with a plurality of support column holes, the support columns penetrate through the support column holes, and the support columns are fixed on the upper surface of the disc 1 by a plurality of nuts. An electrode hole 2 is formed in the center of the disc 1, an electrode body 3 penetrates through the electrode hole 2 and is fixed on the disc 1, and a copper electrode head 10 is fixed on the electrode body 3. One side of the copper electrode tip 10 is provided with a threaded interface, and the other side of the copper electrode tip 10 can be changed into an ellipsoidal copper electrode tip 10 with different curvature radiuses. The various different non-uniform electric field distributions from very non-uniform electric fields to slightly non-uniform electric fields were simulated, respectively.
In one embodiment, the electrode body 3 includes a copper rod 4, an upper stopper 7, and a lower stopper 8. The center of the bottom end of one side of the copper rod 4 is provided with a thread groove 5 limiting piece, and the copper rod is connected with a thread interface limiting piece of the electrode tip 10 through the thread groove 5. The upper limiting part 7 comprises a stainless steel nut and a stainless steel hexagonal screw, and the stainless steel hexagonal screw penetrates into the stainless steel nut to be in extrusion contact with the copper bar 4, so that the position of the copper bar 4 can be adjusted. The lower limiting piece 8 comprises a plurality of stainless steel nuts, and can fix the copper rod 4.
In one embodiment, the disc 1, the support column and the nut are all made of bakelite materials, and the insulation and mechanical properties are good. The upper limiting piece 7 can adjust the distance between the electrode tip 10 and the cathode, and can change the strength of the uneven aging electric field. The copper bar 4 is connected with a high-voltage power supply by a high-voltage wire. The electrode is placed entirely in an aging vacuum chamber and placed over the insulating paper layer 12. The burn-in cavity ground electrode 13 is placed under the insulating paper layer 12. When the non-uniform electric field aging is carried out, the liquid level of the transformer oil in the aging experiment cavity needs to be ensured to be beyond the upper end of the copper rod 4 of the electrode.
Although the embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to the above-described specific embodiments and application fields, and the above-described specific embodiments are merely illustrative, and not restrictive. Those skilled in the art, having the benefit of this disclosure, may effect numerous forms of the invention without departing from the scope of the invention as claimed.
Claims (10)
1. A device for simulating the continuous aging of an uneven electric field of an oiled paper insulating material is characterized by comprising,
the cavity is used for containing transformer oil and is grounded;
an insulating paper layer arranged in the cavity;
a ground electrode disposed in the cavity and disposed below the insulating paper layer;
the support seat comprises a disc and a plurality of support columns vertically fixed on the edge of the disc, an electrode hole is formed in the center of the disc, and the support columns are supported on the insulating paper layer;
an electrode body, which comprises,
the copper rod extends axially and extends out of the cavity through a lead to be connected with a high-voltage power supply, and the copper rod is detachably inserted into the electrode hole;
the upper limiting piece is detachably sleeved on the copper rod and is provided with a detachable fastening piece so as to fasten the upper limiting piece to the copper rod at a preset position;
the lower limiting piece is sleeved on the copper rod to limit at a second position;
the thread groove is arranged at the bottom end of the copper rod;
the electrode tip comprises a threaded joint detachably connected with the threaded groove and an arc electrode tip connected with the threaded joint.
2. The device for simulating the continuous aging of an uneven electric field of an oiled paper insulating material according to claim 1, wherein the electrode tip is preferably an ellipsoidal copper electrode tip.
3. The device for simulating continuous aging of an uneven electric field of an oiled paper insulating material according to claim 2, wherein ellipsoidal copper electrode tips with different radii of curvature are detachably connected with the threaded groove to form different uneven electric field distributions.
4. The apparatus for simulating continuous aging of an uneven electric field of a oiled paper insulation material of claim 1, wherein the upper limiting member comprises a stainless steel nut, and the fastener comprises a stainless steel hex screw which penetrates into the stainless steel nut to be in pressing contact with the copper bar.
5. The apparatus for simulating continuous aging of an uneven electric field of a oiled paper insulating material of claim 1, wherein the lower limiting member comprises a plurality of stainless steel nuts.
6. The apparatus for simulating continuous aging of an uneven electric field of a oiled paper insulating material of claim 1, wherein the disc and the support post are each made of bakelite material.
7. The apparatus for simulating continuous aging of an uneven electric field of a oiled paper insulating material according to claim 1, wherein the support column is fixed on the upper surface of the disc by a plurality of bakelite nuts.
8. The apparatus for simulating continuous aging of an uneven electric field of an oilpaper insulation material according to claim 7, wherein said upper stopper adjusts a distance between the electrode tip and the ground electrode to change an intensity of the uneven electric field.
9. The device for simulating continuous aging of an uneven electric field of an oiled paper insulating material according to claim 1, wherein the liquid level of the transformer oil is above the upper end of the copper rod.
10. The device for simulating continuous aging of an uneven electric field of an oilpaper insulating material according to claim 1, wherein said electrode tip has a semi-ellipsoidal structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211332736.XA CN117031139A (en) | 2022-10-28 | 2022-10-28 | Device for simulating continuous aging of uneven electric field of oilpaper insulating material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211332736.XA CN117031139A (en) | 2022-10-28 | 2022-10-28 | Device for simulating continuous aging of uneven electric field of oilpaper insulating material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117031139A true CN117031139A (en) | 2023-11-10 |
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ID=88624963
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211332736.XA Pending CN117031139A (en) | 2022-10-28 | 2022-10-28 | Device for simulating continuous aging of uneven electric field of oilpaper insulating material |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117031139A (en) |
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2022
- 2022-10-28 CN CN202211332736.XA patent/CN117031139A/en active Pending
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