CN109559879A - A kind of ultra-high/extra-high voltage gas-insulated transformer class casing with explosion-proof disaster mitigation function - Google Patents
A kind of ultra-high/extra-high voltage gas-insulated transformer class casing with explosion-proof disaster mitigation function Download PDFInfo
- Publication number
- CN109559879A CN109559879A CN201910019491.7A CN201910019491A CN109559879A CN 109559879 A CN109559879 A CN 109559879A CN 201910019491 A CN201910019491 A CN 201910019491A CN 109559879 A CN109559879 A CN 109559879A
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- transformer
- casing
- insulated
- support
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- 230000000116 mitigating effect Effects 0.000 title claims abstract description 13
- 238000002955 isolation Methods 0.000 claims abstract description 25
- 238000009413 insulation Methods 0.000 claims abstract description 15
- 239000012212 insulator Substances 0.000 claims description 23
- 239000004020 conductor Substances 0.000 claims description 7
- 239000004519 grease Substances 0.000 claims description 7
- 150000001875 compounds Chemical class 0.000 claims description 4
- 229910052573 porcelain Inorganic materials 0.000 claims description 4
- 238000009422 external insulation Methods 0.000 claims description 3
- VPAYJEUHKVESSD-UHFFFAOYSA-N trifluoroiodomethane Chemical compound FC(F)(F)I VPAYJEUHKVESSD-UHFFFAOYSA-N 0.000 claims description 3
- 238000004880 explosion Methods 0.000 abstract description 17
- 230000005540 biological transmission Effects 0.000 abstract description 3
- 238000009434 installation Methods 0.000 abstract description 3
- 238000005457 optimization Methods 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 68
- 239000003921 oil Substances 0.000 description 12
- 230000002265 prevention Effects 0.000 description 10
- 238000002485 combustion reaction Methods 0.000 description 4
- 230000006378 damage Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 206010000369 Accident Diseases 0.000 description 1
- 241001633942 Dais Species 0.000 description 1
- OTMSDBZUPAUEDD-UHFFFAOYSA-N Ethane Chemical compound CC OTMSDBZUPAUEDD-UHFFFAOYSA-N 0.000 description 1
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- 206010037660 Pyrexia Diseases 0.000 description 1
- HSFWRNGVRCDJHI-UHFFFAOYSA-N alpha-acetylene Natural products C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000003796 beauty Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 125000002534 ethynyl group Chemical group [H]C#C* 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
- 230000002459 sustained effect Effects 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
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/32—Insulating of coils, windings, or parts thereof
- H01F27/324—Insulation between coil and core, between different winding sections, around the coil; Other insulation structures
-
- 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)
- Gas-Insulated Switchgears (AREA)
Abstract
The invention belongs to the electrical apparatus insulation structure design and optimization design fields of ultra-high/extra-high voltage AC and DC transmission facility, more particularly to a kind of ultra-high/extra-high voltage gas-insulated transformer class casing with explosion-proof disaster mitigation function, including gas insulated bushing, connect the isolation buffer gas chamber of gas insulated bushing and oil tank of transformer and the shading ring of cannula tip.The installation of isolation buffer gas chamber both ends is dielectrically separated from support.When inside pipe casing electric discharge, which causes casing side to be dielectrically separated from support, to be destroyed, isolation buffer gas chamber can play buffer function, prevent gas from entering inside transformer, transformer oil is stopped to enter failure inside pipe casing simultaneously, it reduces casing and the probability of burning and explosion occurs for transformer, promote the safety and reliability of casing and transformer.
Description
Technical field
The invention belongs to the electrical apparatus insulation structure design and optimization design field of ultra-high/extra-high voltage AC and DC transmission facility, tools
Body is related to a kind of ultra-high/extra-high voltage gas-insulated transformer class casing with explosion-proof disaster mitigation function.
Background technique
Casing failure is to cause the one of the major reasons of Causing Fire in Transformer, although fire occurs for transformer class casing
Probability is lower, but once often causes larger breaking-up to transformer because certain reason is on fire, or even causes neighbouring transformer and its
He damages electrical equipment, seriously endangers substation safety stable operation.In previous transformer fire accident case, casing is drawn
It is typical electric discharge source that insulator, which discharges, increases outgoing line device electric discharge in seat, under lever system electric discharge, casing, these positions are once
Insulation breakdown or flashover, the high energy arc for generation of discharging, which occurs, rises local oil temperature suddenly, forms oil vapour and crack out can
Combustion property gas (hydrogen, methane, ethane, ethylene, acetylene etc.), the pressure wave that bulk gas is formed will cause porcelain under oil impregnated paper bushing
Set explosion increases the rupture of seat sealing structure, and transformer oil is sprayed from casing flange or raising seat flange position, and encountering outside has
The fuel gas and oil vapour decomposed after oxygen environment can light and sustained combustion, causes fire development to expand, the intensity of a fire will be spread to
Other positions of transformer.As it can be seen that the synergy of insulation breakdown and mechanical defect may cause casing heavy explosion, generation it is huge
Big energy causes high risk fire, seriously affects the safety of electric system and by property.
Summary of the invention
The purpose of the present invention is to solve existing design there are the problem of, provide it is a kind of with explosion prevention function it is super/
Extra-high voltage gas-insulated transformer class casing, the casing introduce isolation buffer gas chamber in the design, when inside pipe casing electric discharge is led
When casing side disc insulator being caused to be dielectrically separated from support damage, then transformer side is dielectrically separated from support and can effectively stop transformation
Device oil stream air inlet chamber, while a possibility that stop the gas in casing to enter inside transformer, reduce arc ignition transformer oil,
It reduces because inside pipe casing electric discharge leads to the probability of casing and Explosion of Transformer, to improve ultra-high/extra-high voltage AC and DC casing and change
The safety and reliability of depressor in operation.
In order to achieve the above objectives, the present invention adopts the following technical scheme that realization:
A kind of ultra-high/extra-high voltage gas-insulated transformer class casing with explosion-proof disaster mitigation function, including gas insulated bushing
And the power transformer enclosure being connected with transformer base part, the first end of power transformer enclosure are used to connect with transformer base part
It connects, the first end of power transformer enclosure is sealed and installed with first and is dielectrically separated from support, and first is dielectrically separated from support and transformer class
Transformer outlet grease chamber is capable of forming between component；The second end and gas insulated bushing of power transformer enclosure are connected by flange
It connects, power transformer enclosure is divided into two sections from the side close to second end, and two sections, by flanged joint, seal two sections of junctions
It is equipped with second and is dielectrically separated from support, second is dielectrically separated from support using disc insulator, board-like insulator or insulated gate, is becoming
Depressor increase seat inner cavity, first be dielectrically separated from support and second be dielectrically separated from support between be formed with isolation buffer gas chamber；Transformation
The second end that device increases seat is communicated with gas insulated bushing；The casing major insulation gas chamber of isolation buffer gas chamber and gas insulated bushing
In fill insulating gas；
Center conductor is provided in gas insulated bushing and power transformer enclosure, center conductor and second are dielectrically separated from support
And it is dielectrically separated between support with first and is tightly connected；Equipped with concentric cartridge type metallic shield electricity inside gas insulated bushing
Pole；
The end of gas insulated bushing is equipped with shading ring.
The external insulation of gas insulated bushing is Hollow Compound/porcelain insulator.
The insulating gas is preferably SF6Insulating gas or other environment-friendly type insulated gases, such as CO2、N2, PFC gas,
CF3I gas, C4F7N gas or C5F10O gas etc..
First be dielectrically separated from support be disc insulator, board-like insulator, tapered insulator or insulated gate, these insulation every
It is to be dielectrically separated from support with insulation, sealing and mechanical support characteristics from support.
Concentric cartridge type metallic shield cartridge type electrode includes at least one set of high-field electrode and grounding electrode, grounding electrode and ground connection
Flanged joint, the both ends of high-field electrode are connected with each other and are consolidated by several insulating bars with end corresponding on grounding electrode respectively
It is fixed.
Air pressure in isolation buffer gas chamber is greater than the air pressure in gas insulated bushing.
The transformer base part is transformer, converter power transformer or reactor.
Compared with prior art, the invention has the following beneficial effects:
The present invention has the ultra-high/extra-high voltage gas-insulated transformer class casing of explosion-proof disaster mitigation function, compared to traditional change
Depressor class casing has the following advantages: first generation transformer class casing is usually oil impregnated paper bushing, such casing is although in many years
It shows and stablizes in operation, but still there are problems that moisture-sensitive, easily leakage；On the other hand, when inside pipe casing discharges, set
Pipe is easy to happen explosion and forms extensive fire, causes greatly to threaten to the safe and stable operation of electric system.The second generation
Casing is resin impregnated paper bushing, such casing dielectric loss and partial discharge performance can match in excellence or beauty with oil impregnated paper bushing, while small in size, weight
Gently, the advantages that hydrophobicity is good, durability against pollution is strong, easy to maintain；However, the investment of such bushing installation is big, manufacturing cost is higher, to life
Production condition, manufacturing process etc. are more demanding；In addition, with the continuous promotion of transmission capacity, the fever and heat dissipation of glue stain paper bushing
Resolving probiems difficulty is larger.Ultra-high/extra-high voltage gas-insulated transformer class casing with explosion prevention function of the invention passes through second
Be dielectrically separated from support and first be dielectrically separated from support by entire casing be divided into transformer outlet grease chamber, isolation buffer gas chamber and
Insulating gas is filled in the casing major insulation gas chamber of casing major insulation gas chamber, isolation buffer gas chamber and gas insulated bushing；It is first
First a bit, which has the characteristics that light-weight；Secondly, the casing introduces isolation buffer gas chamber in the design, when in casing
Portion electric discharge cause the second of casing side be dielectrically separated from support damage when, then the first of transformer side be dielectrically separated from support can be effective
Stop transformer oil to flow into isolation buffer gas chamber, while the gas in casing being stopped to enter inside transformer, reduces electric arc and draw
A possibility that combustion transformer oil causes casing and transformer to burn and explode reduces because inside pipe casing electric discharge leads to casing and transformation
The probability of device explosion, so that the safety and reliability of ultra-high/extra-high voltage AC and DC casing and transformer in operation is improved, because
This casing of the invention has the characteristics that high reliablity, cost is relatively low, convenient for installation and maintenance, explodes and radiates there is no spontaneous combustion and is tired
The problems such as difficult, has good development and application prospect.
Detailed description of the invention
Fig. 1 is the knot of the ultra-high/extra-high voltage gas-insulated transformer class casing with explosion prevention function of one embodiment of the invention
Structure diagrammatic cross-section.
Fig. 2 is the ultra-high/extra-high voltage gas-insulated transformer class casing with explosion prevention function of another embodiment of the present invention
Structural profile illustration.
Fig. 3 is the structural schematic diagram of embodiment illustrated in fig. 1 lower part of the present invention.
Fig. 4 is the present invention with the bilayer gold used in the ultra-high/extra-high voltage gas-insulated transformer class casing of explosion prevention function
Belong to shielding cartridge type electrode structure schematic diagram；
Fig. 5 is the ultra-high/extra-high voltage gas-insulated transformer class casing with explosion prevention function of another embodiment of the present invention
Structural profile illustration；
Fig. 6 is the ultra-high/extra-high voltage gas-insulated transformer class casing with explosion prevention function of another embodiment of the present invention
Structural profile illustration.
In figure, 1-1- gas insulated bushing, 1-2- power transformer enclosure, 1-3- isolation buffer gas chamber, 1-4- shading ring, 1-
5- transformer outlet grease chamber, 1-6- casing major insulation gas chamber, 1-7- insulated gate, 1-8- disc insulator, 1-9- center conductor, 1-
The concentric cartridge type metallic shield electrode of 10-, 1-11- Hollow Compound/insulator, 3-1- high-field electrode, 3-2- grounding electrode, 3-3- are exhausted
Edge stick, the board-like insulator of 4-.
Specific embodiment
The present invention is made further instructions below in conjunction with attached drawing.
As shown in Figure 1 to Figure 3, the ultra-high/extra-high voltage gas-insulated transformer class casing with explosion prevention function of the invention, packet
The power transformer enclosure 1-2 for including gas insulated bushing 1-1 and being connected with transformer base part, power transformer enclosure 1-2 are to turn
The first end (port on the left of lower end i.e. shown in figure) of neck shape, power transformer enclosure 1-2 is used to connect with transformer base part,
The first end of power transformer enclosure 1-2 is sealed and installed with first and is dielectrically separated from support, and first is dielectrically separated from support and transformer class
Transformer outlet grease chamber 1-5 is capable of forming between component；The second end (i.e. as shown in the figure upward one of power transformer enclosure 1-2
Hold) pass through flanged joint with gas insulated bushing 1-1, power transformer enclosure 1-2 (is bent upward from the side close to second end
This section) be divided into two sections, two sections, by flanged joint, are sealed and installed with second two sections of junction and are dielectrically separated from support,
In the inner cavity power transformer enclosure 1-2, it is dielectrically separated from support and second and is dielectrically separated from formation isolation buffer gas chamber 1-3 between support,
Wherein second support is dielectrically separated from using disc insulator, board-like insulator or insulated gate (referring to figure 5 and figure 6)；Transformer liter
The second end of dais 1-2 is communicated with gas insulated bushing 1-1；The casing master of isolation buffer gas chamber 1-3 and gas insulated bushing 1-1
Insulating gas is filled in insulation gas chamber 1-6；Center conductor is provided in gas insulated bushing 1-1 and power transformer enclosure 1-2
1-9, center conductor 1-9 and second be dielectrically separated from support and with first be dielectrically separated from support between be tightly connected；Gas is exhausted
Concentric cartridge type metallic shield electrode 1-10 is housed inside edge casing 1-1；The end of gas insulated bushing 1-1 is equipped with shading ring 1-
4。
As the preferred embodiment of the invention, the external insulation of gas insulated bushing 1-1 is Hollow Compound/porcelain insulator 1-
11；The preferred SF of insulating gas6Insulating gas or other environment-friendly type insulated gases, such as CO2、N2, PFC gas, CF3I gas, C4F7N
Gas or C5F10O gas etc..First is dielectrically separated from support as disc insulator, board-like insulator, tapered insulator or insulated gate.
Air pressure in isolation buffer gas chamber 1-3 is greater than the air pressure in gas insulated bushing 1-1.Transformer base part is transformer, the change of current
Transformer or reactor.Ultra-high/extra-high voltage gas-insulated transformer class casing of the present invention with explosion prevention function preferably but
AC transformer is not exclusively for into and out of thread casing, converter power transformer network side sleeve.Isolation buffer gas chamber of the present invention and two
The support that is dielectrically separated from end can be suitable according to the adjustment of casing voltage class, service condition progress structure, arrangement mode and quantity
With in extensive range.
Referring to Fig. 4, the concentric cartridge type metallic shield cartridge type electrode 1-10 that the present invention uses includes at least one set of high-field electrode
3-1 and grounding electrode 3-2, grounding electrode 3-2 and ground connection flanged joint, the both ends of high-field electrode 3-1 respectively with grounding electrode 3-2
Upper corresponding end is connected with each other and is fixed by several insulating bar 3-3.
In ultra-high/extra-high voltage gas-insulated transformer class casing with explosion prevention function of the invention, power transformer enclosure 1-2
Inside is dielectrically separated from support using 2, forms isolation buffer gas chamber 1-3, transformer outlet grease chamber 1-5, casing major insulation gas chamber
1-6.Support is dielectrically separated between transformer outlet grease chamber 1-5 and isolation buffer gas chamber 1-3, plays oil-gas buffer action；The
Two are dielectrically separated from support between casing major insulation gas chamber 1-6 and isolation buffer gas chamber 1-3, play gas-gas buffer action.Relatively
In the prior art, the present invention has the advantages that isolation buffer gas chamber is introduced in the coupling part of gas insulated bushing and transformer,
When inside pipe casing generates electric discharge, and casing side second is caused to be dielectrically separated from support destruction, transformer side first is dielectrically separated from support energy
Enough gas is stopped to enter inside transformer, while transformer oil can be stopped to enter failure inside pipe casing, effectively reduces casing
A possibility that transformer oil burns improves ultra-high/extra-high voltage gas-insulated transformer class casing to reduce the probability of bushing explosion
Reliability.
Claims (7)
1. a kind of ultra-high/extra-high voltage gas-insulated transformer class casing with explosion-proof disaster mitigation function, which is characterized in that including gas
Insulating sleeve (1-1) and the power transformer enclosure (1-2) being connected with transformer base part, the of power transformer enclosure (1-2)
For connecting with transformer base part, the first end of power transformer enclosure (1-2) is sealed and installed with first and is dielectrically separated from branch for one end
Support, first is dielectrically separated between support and transformer base part and is capable of forming transformer outlet grease chamber (1-5)；Power transformer enclosure
The second end and gas insulated bushing (1-1) of (1-2) are by flanged joint, and power transformer enclosure (1-2) is from close to second end
Side is divided into two sections, and two sections, by flanged joint, are sealed and installed with second two sections of junction and are dielectrically separated from support, second absolutely
Edge isolation support uses disc insulator, board-like insulator or insulated gate, in the inner cavity power transformer enclosure (1-2), the first insulation
Isolation support and second be dielectrically separated from support between be formed with isolation buffer gas chamber (1-3)；The second of power transformer enclosure (1-2)
End is communicated with gas insulated bushing (1-1)；The casing major insulation gas of isolation buffer gas chamber (1-3) and gas insulated bushing (1-1)
Insulating gas is filled in room (1-6)；
Be provided with center conductor (1-9) in gas insulated bushing (1-1) and power transformer enclosure (1-2), center conductor (1-9) with
Second be dielectrically separated from support and with first be dielectrically separated from support between be tightly connected；Dress inside gas insulated bushing (1-1)
There is concentric cartridge type metallic shield electrode (1-10)；
The end of gas insulated bushing (1-1) is equipped with shading ring (1-4).
2. a kind of ultra-high/extra-high voltage gas-insulated transformer class casing with explosion-proof disaster mitigation function according to claim 1,
It is characterized in that, the external insulation of gas insulated bushing (1-1) is Hollow Compound/porcelain insulator (1-11).
3. a kind of ultra-high/extra-high voltage gas-insulated transformer class casing with explosion-proof disaster mitigation function according to claim 1,
It is characterized in that, the insulating gas uses SF6Insulating gas, CO2、N2, PFC gas, CF3I gas, C4F7N gas or C5F10O
Gas.
4. a kind of ultra-high/extra-high voltage gas-insulated transformer class casing with explosion-proof disaster mitigation function according to claim 1,
It is characterized in that, first is dielectrically separated from support as disc insulator, board-like insulator, tapered insulator or insulated gate.
5. a kind of ultra-high/extra-high voltage gas-insulated transformer class casing with explosion-proof disaster mitigation function according to claim 1,
It is characterized in that, cartridge type metallic shield cartridge type electrode (1-10) includes at least one set of high-field electrode (3-1) and grounding electrode with one heart
(3-2), grounding electrode (3-2) and ground connection flanged joint, the both ends of high-field electrode (3-1) respectively with grounding electrode (3-2) on pair
The end answered is connected with each other and is fixed by several insulating bars (3-3).
6. a kind of ultra-high/extra-high voltage gas-insulated transformer class casing with explosion-proof disaster mitigation function according to claim 1,
It is characterized in that, the air pressure in isolation buffer gas chamber (1-3) is greater than the air pressure in gas insulated bushing (1-1).
7. a kind of ultra-high/extra-high voltage gas-insulated transformer class casing with explosion-proof disaster mitigation function according to claim 1,
It is characterized in that, the transformer base part is transformer, converter power transformer or reactor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910019491.7A CN109559879A (en) | 2019-01-09 | 2019-01-09 | A kind of ultra-high/extra-high voltage gas-insulated transformer class casing with explosion-proof disaster mitigation function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910019491.7A CN109559879A (en) | 2019-01-09 | 2019-01-09 | A kind of ultra-high/extra-high voltage gas-insulated transformer class casing with explosion-proof disaster mitigation function |
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|---|---|
| CN109559879A true CN109559879A (en) | 2019-04-02 |
Family
ID=65872708
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910019491.7A Pending CN109559879A (en) | 2019-01-09 | 2019-01-09 | A kind of ultra-high/extra-high voltage gas-insulated transformer class casing with explosion-proof disaster mitigation function |
Country Status (1)
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113223813A (en) * | 2021-05-06 | 2021-08-06 | 安徽金环电气设备有限责任公司 | Oil-immersed transformer insulation sleeve with warning effect |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113223813A (en) * | 2021-05-06 | 2021-08-06 | 安徽金环电气设备有限责任公司 | Oil-immersed transformer insulation sleeve with warning effect |
| CN113223813B (en) * | 2021-05-06 | 2022-04-26 | 安徽金环电气设备有限责任公司 | Oil-immersed transformer insulation sleeve with warning effect |
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