CN113035518B - Transformer body internal oiling structure for defect simulation - Google Patents
Transformer body internal oiling structure for defect simulation Download PDFInfo
- Publication number
- CN113035518B CN113035518B CN202110180783.6A CN202110180783A CN113035518B CN 113035518 B CN113035518 B CN 113035518B CN 202110180783 A CN202110180783 A CN 202110180783A CN 113035518 B CN113035518 B CN 113035518B
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- transformer
- oil
- transformer body
- insulating oil
- oil guide
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- 230000007547 defect Effects 0.000 title claims abstract description 33
- 238000004088 simulation Methods 0.000 title claims abstract description 33
- 238000002347 injection Methods 0.000 claims abstract description 38
- 239000007924 injection Substances 0.000 claims abstract description 38
- 238000003825 pressing Methods 0.000 claims description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 7
- 239000012790 adhesive layer Substances 0.000 claims description 6
- 230000000149 penetrating effect Effects 0.000 claims description 6
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 4
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 4
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 2
- 238000012544 monitoring process Methods 0.000 abstract description 10
- 238000005070 sampling Methods 0.000 abstract description 4
- 239000000123 paper Substances 0.000 description 12
- 238000009413 insulation Methods 0.000 description 5
- 230000004044 response Effects 0.000 description 5
- 238000001514 detection method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000007789 sealing Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000011087 paperboard Substances 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- -1 polytetrafluoroethylene Polymers 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/08—Cooling; Ventilating
- H01F27/10—Liquid cooling
- H01F27/12—Oil cooling
- H01F27/14—Expansion chambers; Oil conservators; Gas cushions; Arrangements for purifying, drying, or filling
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Housings And Mounting Of Transformers (AREA)
Abstract
The invention provides an oil injection structure in a transformer body for defect simulation, which comprises the following components: a plurality of insulating oil guide pipes; each insulating oil guide pipe is laid at a preset position of the transformer body, an external port of each insulating oil guide pipe is communicated with a sample injection oil interface on the wall of the transformer oil tank, so that an external characteristic oil sample is injected into the preset position of the transformer, and the oil sample at the preset position inside the transformer is taken out subsequently; the preset positions comprise: one or more of the transformer body interior, the transformer body exterior, the core and the leads. According to the invention, the external characteristic oil sample is injected into the preset position of the transformer through the sample injection oil interface on the wall of the transformer oil tank, and the oil sample at the preset position inside the transformer is taken out later, so that the timing sampling analysis on the position of the transformer, which is easy to generate faults, is convenient, the running state of the key position can be monitored in time, and the monitoring precision of the defect position of the transformer is improved.
Description
Technical Field
The invention relates to the technical field of power systems, in particular to an oil injection structure in a transformer body for defect simulation.
Background
The internal defect simulation of the transformer is generally performed by adopting modes of built-in hot spots, partial discharge points and the like, but the coil discharge defects cannot be considered with the fault severity and the fault position, so that the research on the diffusion speed of the arc discharge type characteristic gas cannot be realized by the simulation of the traditional mode.
In order to meet the monitoring requirement of a typical fault model platform project, namely, the research on the response time of an online monitoring gas detection system to detect a characteristic oil sample, the relation between the distance between a gas production point and a sampling point and the response time is searched by monitoring the characteristic gas response time of different positions, which is a key problem to be solved urgently at present.
Disclosure of Invention
In view of the above, the invention provides an oil injection structure in the transformer body for defect simulation, which aims to solve the problem that in the prior art, dead zones exist in monitoring of internal defects of a transformer caused by only reserving an oil extraction port on the wall of a transformer box.
The invention provides an oil injection structure in a transformer body for defect simulation, which comprises the following components: a plurality of insulating oil guide pipes; the insulation oil guide pipes are paved at preset positions of the transformer body, the external ports of the insulation oil guide pipes are communicated with sample injection oil interfaces on the wall of the transformer oil tank and used for injecting external characteristic oil samples into the preset positions of the transformer, and then the oil samples at the preset positions inside the transformer are taken out, so that the operation state of the preset positions inside the transformer can be monitored in real time, and the relation between the relative positions of fault points and detection points and the response time of monitoring equipment is obtained; the preset position comprises: one or more of the transformer body interior, the transformer body exterior, the core and the leads.
Further, in the above-mentioned oil injection structure for a transformer body for defect simulation, each of the insulating oil guide pipes is inserted into the first oil passage on the inner diameter side of the high-voltage coil in the transformer, the first oil passages on the inner and outer diameter sides of the medium-voltage coil in the transformer, and/or the first oil passages on the inner and outer diameter sides of the low-voltage coil in the transformer through the lower pressure plate or the upper pressure plate.
Further, in the above-mentioned transformer body internal oiling structure for defect simulation, the insulating oil guide pipe is stuck on the corresponding transverse paper tape on the stay curtain through crepe paper.
Further, in the above-mentioned oil injection structure for the inside of the transformer body for defect simulation, the lower pressure plate and the lower yoke pad block are sequentially provided with lower through holes for penetrating the insulating oil guide pipe, and an adhesive layer is filled in the lower through holes at the position of the lower pressure plate for fixing the insulating oil guide pipe; and/or upper through holes are sequentially formed in the upper pressing plate and the upper iron yoke cushion block and used for penetrating the insulating oil guide pipe, and an adhesive layer is filled in the upper through holes and positioned at the upper pressing plate and used for fixing the insulating oil guide pipe.
Further, in the above-mentioned transformer body internal oiling structure for defect simulation, each of the insulating oil guide pipes is placed in a gap between a stage of the core leg and the core binding band, and an external port of each of the insulating oil guide pipes extends out of the transformer body.
Further, in the above-mentioned transformer body internal oiling structure for defect simulation, the binding tape of the insulating oil guide pipe and the iron core binding tape are staggered in the height direction.
Furthermore, in the above-mentioned transformer body internal oiling structure for defect simulation, a plurality of guiding wooden pieces are arranged on clamping piece limb plates of the transformer, and the insulating oil guide pipe is bound at the lead wire through each guiding wooden piece.
Further, in the above-mentioned transformer body internal oiling structure for defect simulation, the external port of the insulating oil guide pipeline is communicated with the sample injection oil port on the wall of the transformer oil tank through the external oil injection pipeline.
Further, in the above-mentioned transformer body internal oil injection structure for defect simulation, the diameter of the external oil injection pipeline is equal to the diameter of the insulating oil guide pipeline.
Further, in the above-mentioned transformer body internal oiling structure for defect simulation, the insulating oil guide pipe is a PTFE pipe.
According to the transformer body internal oiling structure for defect simulation, the insulating oil guide pipe is arranged at the positions, which are easy to fail, of the transformer body, such as the inside and the outside of the transformer body, so that the external characteristic oil sample is injected into the preset position of the transformer through the sample injection oil interface on the wall of the transformer oil tank, and the oil sample at the preset position of the transformer is taken out, so that the timed sampling analysis of the positions, which are easy to fail, of the transformer is facilitated, the running state of key positions can be monitored in time, and the monitoring precision of the defective positions of the transformer is improved.
Drawings
Various other advantages and benefits 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. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:
fig. 1 is a schematic diagram of a structure in which an insulating oil guide pipe is disposed inside a transformer body in an oil injection structure inside the transformer body for defect simulation according to an embodiment of the present invention;
FIG. 2 shows a fixing manner of the insulating oil guide pipe in the transformer according to the embodiment of the present invention;
fig. 3 is a schematic structural diagram of an insulating oil guide pipe in an oil injection structure in a transformer body for defect simulation, which is provided by an embodiment of the present invention, disposed near an iron core;
FIG. 4 is a cross-sectional view taken along the direction A in FIG. 3;
fig. 5 is a schematic structural diagram of an insulating oil guide pipe in an oil injection structure inside a transformer body for defect simulation provided by an embodiment of the present invention disposed outside the transformer body;
FIG. 6 is a partial enlarged view of the P-direction in FIG. 5;
fig. 7 is a schematic diagram of a connection structure between an internal insulating oil guide pipe and an external oil injection pipe according to an embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure 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 disclosure to those skilled in the art. It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other. The invention will be described in detail below with reference to the drawings in connection with embodiments.
Referring to fig. 1, 3 and 5, an internal oiling structure of a transformer body 2 for defect simulation according to an embodiment of the present invention includes: a plurality of insulating oil guide pipes 1; the insulating oil guide pipes 1 are paved at preset positions of the transformer body 2, and the external ports of the insulating oil guide pipes 1 are communicated with sample injection oil interfaces 211 on the transformer oil tank wall 21, so that external characteristic oil samples are injected into the preset positions of the transformer, and then the oil samples at the preset positions inside the transformer are taken out, so that the running state of the preset positions inside the transformer can be monitored in real time, and the relation between the relative positions of fault points and detection points and the response time of monitoring equipment is obtained; the preset position comprises: inside the transformer body 2, outside the transformer body 2, one or more of the core and the leads.
Specifically, in order to monitor the real-time status of a portion of the transformer body 2 that is likely to fail, one or more insulating oil pipes 1 are arranged at predetermined positions of the transformer body 2 in the present embodiment. The preset position comprises: inside the transformer body 2, outside the transformer body 2, one or more of the core and the leads. The insulating oil guide pipe 1 can be a PTFE pipe, has good insulating property and can be properly arranged in a high field intensity area inside the body; the dielectric constant is equivalent to that of the paperboard, so that the field intensity of the surface oil is not excessively high; the applicable temperature can reach 200 ℃ at the highest, and the transformer internal operation condition is suitable; the chemical structure is stable, and the oil quality of the transformer is not influenced. The preset position in this embodiment refers to a position where the transformer is likely to fail.
In the first implementation manner of the present embodiment, when the insulating oil pipe 1 is disposed inside the transformer body 2, each insulating oil pipe 1 is inserted into the first oil passage on the inner diameter side of the high-voltage coil 22 inside the transformer, the first oil passage on the inner and outer diameter sides of the medium-voltage coil 23 inside the transformer, and/or the first oil passage on the inner and outer diameter sides of the low-voltage coil 24 inside the transformer through the lower platen 3 or the upper platen (not shown in the drawing).
Referring to fig. 2, since the end of the insulating oil conduit 1 is easily moved, in this embodiment, the insulating oil conduit 1 is adhered to the corresponding transverse paper tape 7 on the stay curtain 5 by crepe paper. In practice, several stays are connected into one whole by several transverse paper strips 7 to form a stay curtain 5; then a section of oil sealing paper tape 12 is arranged at the upper end of the insulating oil guide pipe 1, and simultaneously, the insulating oil guide pipe 1 is fixedly bonded by utilizing two transverse paper tapes 7 close to the lower end of the stay.
Referring to fig. 1 again, in order to further fix the insulating oil guide pipe 1 inside the transformer body 2 stably, the lower pressing plate 3 and the lower yoke pad 4 are sequentially provided with lower through holes for penetrating the insulating oil guide pipe 1, and an adhesive layer is filled in the lower through holes at the position of the lower pressing plate 3 for fixing the insulating oil guide pipe 1; and/or upper through holes are sequentially formed in the upper pressing plate (not shown) and the upper yoke cushion block (not shown) and used for penetrating the insulating oil guide pipe 1, and an adhesive layer 31 is filled in the upper through holes at the position of the upper pressing plate and used for fixing the insulating oil guide pipe 1.
That is, when the insulating oil pipe 1 is inserted into the first oil passage on the inner diameter side of the high-voltage coil 22 in the body, the first oil passage on the inner and outer diameter sides of the medium-voltage coil 23 in the transformer and/or the first oil passage on the inner and outer diameter sides of the low-voltage coil 24 in the transformer, the insulating oil pipes 1 are bonded and bound by the stay curtains 5, the insulating oil pipe 1 is adhered to the corresponding transverse paper tape 7 of the stay curtains 5 by the corrugated paper tape, and the insulating oil pipe 1 is fixed by the glue at the opening position of the lower pressure plate 3 (or the upper pressure plate). The inner diameter side and the outer diameter side are considered to be inner diameter sides with respect to the core side, and the side closer to the core 6 is considered to be outer diameter sides with respect to the core 6.
With continued reference to fig. 1, in this embodiment, the inner diameter of the insulated oil conduit 1 is 10mm or more and the outer diameter is 18mm or less, and the inner diameter of the oil passage is generally smaller than the inner diameter of the insulated oil conduit 1, taking into account the oil injection resistance and the arrangement space of the insulated oil conduit. Since the single main insulation oil gap is usually not more than 12mm, smaller than the outer diameter of the insulation oil guide pipe 1. Here, the insulating oil guide pipe 1 needs to occupy two oil gap positions, and because the detection sample oil position is close to the oil gap at the side of the coil cake, the other oil gap is covered by the oil sealing paper tape 12 (i.e. the oil sealing paper tape 12 is covered near the upper port of the insulating oil guide pipe 1), so as to ensure that the oil taking or filling positions are all close to the oil gap at the side of the coil. In order to reserve the assembly gap, the oil seal paper tape 12 may be spaced apart from the upper port of the insulating oil guide pipe 1.
Referring to fig. 3 and 4, in the second implementation of the embodiment of the present invention, each of the insulating oil pipes 1 is placed in a gap between the stage 61 of the core leg and the core binder, and the external port of each of the insulating oil pipes 1 protrudes out of the transformer body 2.
Specifically, the binding belt 11 of the insulating oil guide pipe is a PET belt or a polyester belt.
Preferably, the binding bands 11 of the insulating oil guide pipe and the iron core binding bands are staggered in the height direction, so that partial protrusion is avoided, and inconvenience in installation is caused.
In this embodiment, the insulating oil pipe 1 has an inner diameter of 10mm or more and an outer diameter of 18mm or less. Preferably, the insulating oil guide pipe 1 has an inner diameter of 16mm and an outer diameter of 18mm.
Referring to fig. 5, in a third implementation manner of the present embodiment, a plurality of guiding wooden pieces 8 are disposed on a clamping piece limb 9 of the transformer, and the insulating oil guide pipe 1 is bound at a lead wire through each guiding wooden piece 8.
In particular, the guiding members 8 may be wood chips, the thickness of which may be determined according to the actual situation. The guide wooden pieces 8 may be disposed below the lower platen 3 at intervals in the horizontal direction, i.e., the guide wooden pieces 8 may be disposed in parallel with the lower platen 3. When the insulating oil guide pipe 1 is arranged on the lead, the inner diameter specification of the insulating oil guide pipe 1 can be increased to 25 mm-40 mm.
Referring to fig. 5 and 6, taking an insulating oil guide pipe 1 in phase B as an example, a guide wooden piece 8 may be arranged between a clamping piece limb 9 below the lower pressure plate 3 of the transformer and an extending section of the insulating oil guide pipe 1, and the insulating oil guide pipe 1 is fixed on the guide wooden piece 8 through a binding belt 11. The binding belt here may be a white cloth tape binding belt. Of course, depending on the size of the guide member 8, the insulating oil guide pipes 1 in the a phase, the B phase, and the C phase may be fixed to the same guide member 8.
In the embodiment of the invention, when the insulating oil guide pipe 1 is arranged in the body or near a high-voltage-class lead, the electric field distribution of the position of the insulating pipeline needs to be considered, so that the insulating pipeline is prevented from causing insulation breakdown under the action of high field intensity, and the damage to the transformer is prevented.
Referring to fig. 7, the external port of the insulating oil guide pipe 1 is communicated with a sample injection port on the wall 21 of the transformer oil tank through an external oil injection pipe 10.
Specifically, the external oil injection pipeline 10 is connected with a power pipeline, for example, an oil pump with a head and a flow rate suitable for the external oil injection pipeline can be connected in series, and an interface is arranged on the external oil injection pipeline 10 so that after the sample oil is injected, the sample oil is pumped to a preset position of the transformer body 2 through the oil pump to realize the purpose of monitoring. In practice, the time of injecting the sample oil, namely the time of opening the oil pump, needs to be comprehensively calculated according to the parameters of the oil pump and the volume of the insulating oil guide pipeline, and ensures that the oil sample is accurately required to be injected into a preset position.
More specifically, an interface for injecting sample oil and a pipeline valve are arranged at a position on the wall of the transformer tank, the interface is connected with an external power pipeline through a flange 101 by adopting a metal connecting joint 102, a DN25 valve is reserved outside and is used for being connected with the external power pipeline, and the sample oil is injected into the transformer through an oil pump; the internal welding connection joint of the interface is matched with the special connection joint of polytetrafluoroethylene so as to communicate the insulating oil guide pipe 1 with the external oil injection pipeline 10.
Preferably, the diameter of the external oil injection pipeline 10 is equal to that of the insulating oil guide pipeline 1, so as to prevent the internal breakdown discharge caused by the doping bubbles in the oil injection process. Meanwhile, the insulating oil guide pipe 1 bypasses the oil nest so as to prevent bubbles from doping into the insulating oil guide pipe 1. After the oil is injected, residual bubbles in the pipeline are discharged through an external interface valve, so that no residual gas in the insulating oil guide pipe 1 is ensured.
In summary, according to the transformer body internal oiling structure for defect simulation, through arranging the insulating oil guide pipe at the position which is easy to fail, such as the inside, the outside and the like of the transformer body, the external characteristic oil sample is injected into the preset position of the transformer through the sample injection oil interface on the wall of the transformer oil tank, and then the oil sample at the preset position of the transformer is taken out, so that the timed sampling analysis at the position which is easy to fail of the transformer is facilitated, the running state of the key position can be monitored in time, and the monitoring precision of the defect position of the transformer is improved.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (10)
1. An oil injection structure for a transformer body for defect simulation, comprising: a plurality of insulating oil guide pipes; wherein,
each insulating oil guide pipe is paved at a preset position of the transformer body, an external port of each insulating oil guide pipe is communicated with a sample injection oil interface on the wall of the transformer oil tank and used for injecting an external characteristic oil sample into the preset position of the transformer, and then the oil sample at the preset position inside the transformer is taken out, so that the running state of the preset position inside the transformer can be monitored in real time; the preset position comprises: one or more of the transformer body interior, the transformer body exterior, the core and the leads.
2. The transformer body internal oil injection structure for defect simulation according to claim 1, wherein each of the insulating oil guide pipes is inserted into the first oil passage on the inner diameter side of the transformer internal high-voltage coil, the first oil passage on the inner and outer diameter sides of the transformer internal medium-voltage coil, and/or the first oil passage on the inner and outer diameter sides of the transformer internal low-voltage coil through a lower or upper pressure plate.
3. The transformer body internal oiling structure for defect simulation according to claim 2, wherein the insulating oil guide pipe is stuck on the corresponding transverse paper strip on the stay curtain through crepe paper.
4. The transformer body internal oiling structure for defect simulation according to claim 2, wherein lower through holes are sequentially formed in the lower pressing plate and the lower yoke cushion block and used for penetrating the insulating oil guide pipe, and an adhesive layer is filled in the lower through holes at the position of the lower pressing plate and used for fixing the insulating oil guide pipe; and/or upper through holes are sequentially formed in the upper pressing plate and the upper iron yoke cushion block and used for penetrating the insulating oil guide pipe, and an adhesive layer is filled in the upper through holes and positioned at the upper pressing plate and used for fixing the insulating oil guide pipe.
5. The transformer body internal oil filling structure for fault simulation according to claim 1, wherein each of the insulating oil guide pipes is placed in a gap between a stage of a core leg and a core binding band, and an external port of each of the insulating oil guide pipes protrudes out of the transformer body.
6. The transformer body internal oiling structure for defect simulation of claim 5, wherein the binding tape of the insulating oil guide pipe and the core binding tape are staggered in the height direction.
7. The transformer body internal oiling structure for defect simulation according to claim 1, wherein a plurality of guide wooden pieces are arranged on clamping piece limb plates of the transformer, and the insulating oil guide pipe is bound at a lead wire through each guide wooden piece.
8. The transformer body internal oil injection structure for fault simulation according to claim 1, wherein the external port of the insulated oil guide pipeline is communicated with a sample injection oil port on the transformer oil tank wall through an external oil injection pipeline.
9. The transformer body internal oil injection structure for fault simulation of claim 8, wherein the diameter of the external oil injection pipeline is equal to the diameter of the insulating oil guide pipeline.
10. The transformer body internal oil injection structure for defect simulation according to any one of claims 1 to 9, wherein the insulating oil guide pipe is a PTFE pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110180783.6A CN113035518B (en) | 2021-02-08 | 2021-02-08 | Transformer body internal oiling structure for defect simulation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110180783.6A CN113035518B (en) | 2021-02-08 | 2021-02-08 | Transformer body internal oiling structure for defect simulation |
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| Publication Number | Publication Date |
|---|---|
| CN113035518A CN113035518A (en) | 2021-06-25 |
| CN113035518B true CN113035518B (en) | 2023-11-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110180783.6A Active CN113035518B (en) | 2021-02-08 | 2021-02-08 | Transformer body internal oiling structure for defect simulation |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201540799U (en) * | 2009-09-18 | 2010-08-04 | 特变电工沈阳变压器集团有限公司 | Single-channel multi-point sampling oil sample valve |
| CN201589729U (en) * | 2009-11-03 | 2010-09-22 | 保定天威集团有限公司 | Oil sampling structure |
| CN205228878U (en) * | 2015-12-28 | 2016-05-11 | 保定天威保变电气股份有限公司 | A structure that draws oil sample for large -scale transformer |
-
2021
- 2021-02-08 CN CN202110180783.6A patent/CN113035518B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201540799U (en) * | 2009-09-18 | 2010-08-04 | 特变电工沈阳变压器集团有限公司 | Single-channel multi-point sampling oil sample valve |
| CN201589729U (en) * | 2009-11-03 | 2010-09-22 | 保定天威集团有限公司 | Oil sampling structure |
| CN205228878U (en) * | 2015-12-28 | 2016-05-11 | 保定天威保变电气股份有限公司 | A structure that draws oil sample for large -scale transformer |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113035518A (en) | 2021-06-25 |
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