CN108878123A - The distribution transformer of built-in arrester - Google Patents
The distribution transformer of built-in arrester Download PDFInfo
- Publication number
- CN108878123A CN108878123A CN201810555601.7A CN201810555601A CN108878123A CN 108878123 A CN108878123 A CN 108878123A CN 201810555601 A CN201810555601 A CN 201810555601A CN 108878123 A CN108878123 A CN 108878123A
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- Prior art keywords
- transformer
- arrester
- built
- lightning
- distribution transformer
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- 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
- H01F27/40—Structural association with built-in electric component, e.g. fuse
- H01F27/402—Association of measuring or protective means
-
- 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
- H01F27/40—Structural association with built-in electric component, e.g. fuse
- H01F27/402—Association of measuring or protective means
- H01F2027/404—Protective devices specially adapted for fluid filled transformers
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Thermistors And Varistors (AREA)
Abstract
The invention proposes a kind of distribution transformers of built-in arrester, including：Transformer body, lightning-arrest unit, wherein the lightning-arrest unit is arranged inside the transformer body；The transformer body includes transformer winding, bushing shell for transformer and shell, and the lightning-arrest unit is fixed on the housing, and the lightning-arrest unit is connect by the bushing shell for transformer with the transformer winding.Arrester by being arranged in the inside of transformer body by transformer of the present invention, filling insulation oil medium on the outside of arrester, it is more preferable compared to air dielectric insulation performance when arrester is placed on the outside of transformer body, and it is arrester is in parallel nearby with high and low pressure side casing respectively, when distribution transformer is encroached on by lightning surge, Overvoltage Amplitude can be effectively suppressed, and pass through the length of reduction connecting line, so that arrester is more preferable to the restriction effect of thunder intrusion before steep wave, transformer is efficiently avoided by broken by lightning.
Description
Technical field
The present invention relates to distribution transformer technical fields, in particular to a kind of distribution transformer of built-in arrester.
Background technique
Currently, distribution transformer is one of main equipment of power distribution network, being responsible for will be after 10kV-35kV power voltage step down to 0.4kV
The users such as resident, general industry and commerce, agricultural use is given, the operational safety of distribution transformer has guarantee power supply important
Effect.China distribution transformer overwhelming majority is along the outdoor laying of line corridor, with using based on bar rack type mounting means, i.e. distribution
Transformer is mounted on the rack on line pole (referred to as change platform), and small part uses pier formula and console mode mounting means, leads
Line T connects lead input distribution transformer high-voltage end.
Due to the presence of lightning surge, existing national standards GB/T 50064-2014《The overvoltage of alternating-current electric device
Protection and Insulation Coordination design specification》Clearly stipulate that should the high-pressure side of distribution transformer and low-pressure side be respectively set one group without
Gap metal Oxide Arrester is used as lightning protection, and installation site should be under the premise of meeting electric insulation distance as far as possible
Close to distribution transformer outlet casing.But in actual operation, the failure of distribution transformer still happens occasionally.To find out its cause,
First is that being limited by insulation distance and fixed position, the practical electrical distance between arrester and bushing shell for transformer can not often be accomplished
Very little, arrester requires to be mounted on terminal pole when distribution transformer uses pier formula and console mode mounting means, between the two
Distance is bigger, Intruding wave overvoltage before the steep wave generated near region lightning stroke, and the negative polarity wave reflected from arrester possibly can not be
It is returned in wave front time, the pressure limiting effect of arrester falls flat, and transformer winding, casing insulating overpressure is caused to be hit
It wears；Second is that the electrical connection between arrester and bushing shell for transformer needs node exposed, low-pressure side near region caused by foreign matter is shorted is big
The impact injury of Short-Circuit Current on Transformer winding is very big, easily causes winding deformation or insulation breakdown.In addition, protection distribution transformer
The arrester of device is required using no series gap structure, because undertaking working voltage for a long time, periodic detection is needed to safeguard, but due to
Distribution transformer substantial amounts take the O&M strategy detected once a year cannot achieve, after usual arrester linked network just no longer
Its Parameters variation situation is monitored, dampness Damage by Short Circuit is one of the failure mode that arrester mainly occurs in operation.
To sum up, existing distribution transformer lightning protection setting resultant effect is unsatisfactory, and it is anti-that urgent need further promotes it
Thunder effect could require to match with the operational reliability increasingly increased.
Summary of the invention
In consideration of it, the invention proposes a kind of distribution transformers of built-in arrester, it is intended to solve to improve distribution transformer
The problem of integrated lightning protection performance.
On one side, the invention proposes a kind of distribution transformers of built-in arrester, including：Transformer body is taken shelter from the thunder
Unit, wherein the lightning-arrest unit is arranged inside the transformer body；The transformer body include transformer winding,
Bushing shell for transformer and shell, the lightning-arrest unit is fixed on the housing, and the lightning-arrest unit passes through the bushing shell for transformer
It is connect with the transformer winding.
Further, several unthreaded holes are uniformly offered on the shell, the lightning-arrest unit is threaded through the unthreaded hole
It is interior.
Further, it being provided with metal cover board above the unthreaded hole, the lightning-arrest unit is fixed on the metal cover board,
The metal cover board is for covering the unthreaded hole.
Further, the transformer body further includes cartridge filter, and the cartridge filter is fixed on the housing, the mistake
The lightning-arrest unit is arranged wherein by filter cylinder.
Further, the lightning-arrest unit includes an arrester, the bottom of the terminals of the arrester and the cartridge filter
Face connection.
Further, the terminals of the arrester are cone or cylindrical structure, are set on the bottom surface of the cartridge filter
It is equipped with the connector corresponding with the cone of the terminals or cylindrical structure, the connector and the terminals are logical
The mode for crossing grafting connects.
Further, the connector, bushing shell for transformer and transformer winding are connected by connecting line.
Further, several filter hole are uniformly opened up on the side wall of the cartridge filter.
Further, the middle and upper part of the side wall opens up the filter hole.
Further, the transformer winding includes high-voltage winding and low pressure winding, and the bushing shell for transformer includes high pressure
Casing and low-tension bushing, the arrester include high-voltage end and low-pressure end, wherein the high-voltage end by the bushing with
The high-voltage winding connection, the low-pressure end are connect by the low-tension bushing with the low pressure winding.
Further, the cartridge filter is connect with the medial surface of the shell or lateral surface.
Further, insulating oil is full of in the shell.
Further, the diameter of the filter hole is less than or equal to 1mm.
Further, the arrester is gapless metal-oxide lighting arrester.
Further, the cartridge filter is made of insulating materials such as epoxy, nylon.
Further, the metal cover board and cartridge filter are connect with the shell by bolted connection.
Further, insulating layer is provided on the connecting line lateral surface.
Compared with prior art, the beneficial effects of the present invention are transformer of the present invention is by setting arrester
The filling insulation oil medium on the outside of the inside of transformer body, arrester is set, is placed on transformer body compared to by arrester
Air dielectric insulation performance when outside is more preferable, and arrester is in parallel nearby with high and low pressure side casing respectively, becomes in distribution
When depressor is encroached on by lightning surge, Overvoltage Amplitude can be effectively suppressed, and by the length of reduction connecting line, so that keeping away
Thunder device is more preferable to the restriction effect of thunder intrusion before steep wave, efficiently avoids transformer by broken by lightning.
Further, gapless arrestyer is built into distribution transformer enclosure interior by transformer of the present invention, is not had
Have to extraneous exposed connecting node, become platform all insulation angle from realizing, reduce the number of nodes for needing to do insulation processing,
There is no under the external mode of existing arrester, the exposed possible foreign matter that occurs of connecting node is shorted the wind for causing near region short trouble
Danger, further improves the lightning protection properties and effect of transformer.
Further, by the way that arrester to be immersed in insulating oil always, so that weather is not present in the composite sheath of arrester
Core moisture damage will not occur for the problem of aging, when longtime running, so that the service life is longer for arrester.
Further, by the way that distribution transformer is integrated with gapless arrestyer, arrester installation does not need to account for
With platform space is become, not only reduces and become platform bulk demand, in-site installation is easier, also reduces construction cost.
Further, arrester takes separate modular to design, and realizes electrical connection, operational process using inserting mode
In if you need to take out detection, replacement, can maintain distribution transformer main body it is motionless under the premise of, it is only necessary to open on transformer shell
Reserved mounting hole, that is, implementable dismounting, easy to operate, O&M cost is low.
Detailed description of the invention
By reading the following detailed description of the preferred embodiment, various other advantages and benefits are common for this field
Technical staff will become clear.The drawings are only for the purpose of illustrating a preferred embodiment, and is not considered as to the present invention
Limitation.And throughout the drawings, the same reference numbers will be used to refer to the same parts.In the accompanying drawings：
Fig. 1 is that diagrammatic cross-section is faced in the high-pressure side of the distribution transformer of built-in arrester provided in an embodiment of the present invention；
Fig. 2 is that the low-pressure side of the distribution transformer of built-in arrester provided in an embodiment of the present invention faces diagrammatic cross-section；
Fig. 3 is the side elevational cross-section schematic diagram of the distribution transformer of built-in arrester provided in an embodiment of the present invention；
Fig. 4 is the arrester scheme of installation of the distribution transformer of built-in arrester provided in an embodiment of the present invention.
Specific embodiment
Exemplary embodiments of the present disclosure are described in more detail below with reference to accompanying drawings.Although showing the disclosure in attached drawing
Exemplary embodiment, it being understood, however, that may be realized in various forms the disclosure without should be by embodiments set forth here
It is limited.On the contrary, these embodiments are provided to facilitate a more thoroughly understanding of the present invention, and can be by the scope of the present disclosure
It is fully disclosed to those skilled in the art.It should be noted that in the absence of conflict, embodiment in the present invention and
Feature in embodiment can be combined with each other.The present invention will be described in detail below with reference to the accompanying drawings and embodiments.
It is respectively the high pressure of the distribution transformer of built-in arrester provided in an embodiment of the present invention in conjunction with shown in Fig. 1-4
Section is faced in side, low-pressure side faces section, side elevational cross-section and arrester scheme of installation.It present embodiments provides and is kept away built in one kind
The distribution transformer of thunder device, including：Transformer body, lightning-arrest unit, wherein lightning-arrest unit is arranged inside transformer body；
Transformer body includes transformer winding, bushing shell for transformer and shell 7, and lightning-arrest unit is fixed on shell 7, and lightning-arrest unit passes through
Bushing shell for transformer is connect with transformer winding.Insulating oil 6 is full of in shell 7, arrester unit to be immersed in insulating oil 6.
Transformer body further includes cartridge filter 11, and cartridge filter 11 is fixed on shell 7, and lightning-arrest unit is arranged wherein by cartridge filter 11.It keeps away
Thunder unit includes an arrester 9.Transformer winding includes high-voltage winding 3 and low pressure winding 4, and bushing shell for transformer includes bushing
1 and low-tension bushing 2, arrester 9 includes high-voltage end arrester and low-pressure end arrester, and wherein high-voltage end arrester passes through high pressing sleeve
Pipe is connect with high-voltage winding, and low-pressure end arrester is connect by low-tension bushing with low pressure winding.
It is understood that arrester is by being arranged in the inside of transformer body by transformer described in the present embodiment,
Filling insulation oil medium on the outside of arrester, compared to air dielectric insulating properties when arrester is placed on the outside of transformer body
Can be more preferable and arrester is in parallel nearby with high and low pressure side casing respectively, it is encroached in distribution transformer by lightning surge
When, Overvoltage Amplitude can be effectively suppressed, and by the length of reduction connecting line, so that arrester is to Lightning Incoming Wave before steep wave
The restriction effect of overvoltage is more preferable, efficiently avoids transformer by broken by lightning.By the way that arrester is immersed in insulating oil always
In, so that core moisture damage will not occur for the problem of weathering aging is not present in the composite sheath of arrester, when longtime running,
So that the service life is longer for arrester.
Specifically, uniformly offering several unthreaded holes 13 on shell 7, lightning-arrest unit is threaded through in unthreaded hole 13.Unthreaded hole
13 tops are provided with metal cover board 8, and lightning-arrest unit is fixed on metal cover board 8, and metal cover board 8 is for covering unthreaded hole 13.
Specifically, the terminals of arrester 9 are connect with the bottom surface of cartridge filter 11.Arrester 9 is the oxidation of gapless metal
Object arrester.The terminals of arrester 9 are cone or cylindrical structure, are provided with and terminals on the bottom surface of cartridge filter 11
Cone or the corresponding connector 10 of cylindrical structure, connector 10 and terminals are connected by way of grafting.
Specifically, metal cover board 8 and cartridge filter 11 are connect with shell 7 by bolted connection.Connector 10 becomes
Depressor casing and transformer winding are connected by connecting line 12.Insulating layer is provided on 12 lateral surface of connecting line.
Specifically, cartridge filter 11 is made of insulating materials such as epoxy, nylon.It is uniformly opened up on the side wall of cartridge filter 11
Several filter hole 111.The middle and upper part of side wall opens up filter hole 111.The medial surface or lateral surface of cartridge filter 11 and shell 7 connect
It connects.The diameter of filter hole is less than or equal to 1mm.
Specifically, transformer body include bushing 1, low-tension bushing 2, high-voltage winding 3, low pressure winding 4, iron core 5,
Insulating oil 6 and shell 7, wherein on shell 7, uniformly opening up 6 close to bushing 1,2 position of low-tension bushing respectively
Unthreaded hole 13, the diameter of unthreaded hole 13 can use 10cm-20cm, and metal cover board 8 covers unthreaded hole 13, and metal cover board 8 is used bolt fastening
It is realized after on to shell 7 to the sealing inside transformer body, i.e., so that the inside of shell 7 forms a closed cavity.It is lightning-arrest
Unit uses gapless metal-oxide lighting arrester, the arrester 9 of low pressure end side and high pressure end side by the way of bolt fastening,
It is fixed on 8 inner surface of metal cover board, arrester 9 is electrically connected with one end with insulating layer metal contact wires 12, connecting line 12
The other end connection bushing 1 or low-tension bushing 2 core.Pass through a connector 10 between arrester 9 and connecting line 12
Realize electrical connection, connector 10 can be connection-peg, and the terminals of arrester 9 are set as the male connector of cone or cylindrical body
101, the structure of connection-peg can be designed as 102 structure of female of lotus flower valve structure, and the two after inserting to being integrally formed, inserting mode
Purpose can realize the Fast Installation of arrester, facilitate the detection and replacement during later period O&M.
Specifically, arrester 9 and connection-peg 10 are by 11 mask of cartridge filter, 11 upper surface bolt of cartridge filter is tight
It is affixed on the inner surface of shell 7, cartridge filter 11 is made by insulating materials such as epoxy, nylon, is set on the side wall of cartridge filter 11
Several tiny filter hole 111 are equipped with, to facilitate insulating oil 6 to circulate, the diameter of filter hole 111 is less than or equal to 1mm, position of opening
The middle and upper part of cartridge filter (11) is concentrated on, reserves the height five that height is no less than cartridge filter 11 close to the lower part of 11 side wall of cartridge filter
/ mono- region not aperture.The effect of cartridge filter 11 is that arrester 9 breaks down after damage in extreme circumstances, is collected lightning-arrest
The fragment clast that device 9 generates prevents pollution insulating oil.Connection-peg 10 is fixed on 11 bottom surface of cartridge filter.
Specifically, the shape of cartridge filter 11 is corresponding with the shape of unthreaded hole 13, open at one end, the opening of cartridge filter 11
End is provided with edge connecting plate, and edge connecting plate is for making cartridge filter 11 be fixed together with shell, and edge connecting plate and mistake
The bottom surface of filter cylinder 11 is arranged in parallel.Cartridge filter 11 can have following two set-up mode：One, cartridge filter 11 is set in arrester
9 outside, edge connecting plate are fixed on the medial surface of shell, and the diameter of cartridge filter 11 is greater than the diameter of unthreaded hole 13；Two, will
Cartridge filter 11 is set in the outside of arrester 9, at the same make filter cylinder 11 main part maximum gauge be less than unthreaded hole 13 diameter,
Cartridge filter 11 is threaded through in unthreaded hole, and the diameter of the edge connecting plate of cartridge filter 11 is greater than the diameter of unthreaded hole 13, by edge
Connecting plate is fixed on the lateral surface of shell, can also be fixed simultaneously metal cover board and edge connecting plate, by using
Aforesaid way, the replacement of more convenient cartridge filter 11.
Specifically, the arrester 9 being installed in parallel with bushing 1, using composite sheath material, voltage rating is selected as
17kV (corresponding distribution transformer high-voltage end voltage class is 10kV) or 51kV (the corresponding high-end voltage class of distribution transformer
For 35kV), other parameters GB/T 11032-2010 according to national standards《Alternating current gapless metal oxide arrester》It chooses.
The arrester (9) being installed in parallel with low-tension bushing (2), using composite sheath material, voltage rating is selected as 0.28kV, and (correspondence is matched
Piezoelectric transformer low-pressure end voltage class is 0.4kV), other parameters GB/T 11032-2010 according to national standards《AC gapless
Metal oxide arrester》It chooses.
It is understood that arrester installation is not required to by the way that distribution transformer is integrated with gapless arrestyer
It occupies and becomes platform space, not only reduce and become platform bulk demand, in-site installation is easier, and it is low to also reduce construction cost.
Arrester takes separate modular to design, and realizes electrical connection using inserting mode, detects, more in operational process if you need to take out
It changes, it can be under the premise of maintaining distribution transformer main body motionless, it is only necessary to open the mounting hole reserved on transformer shell
Implement dismounting, easy to operate, O&M cost is low.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
Mind and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to include these modifications and variations.
Claims (17)
1. a kind of distribution transformer of built-in arrester, which is characterized in that including：Transformer body, lightning-arrest unit, wherein
The lightning-arrest unit is arranged inside the transformer body；
The transformer body includes transformer winding, bushing shell for transformer and shell, and the lightning-arrest unit is fixed on the shell
On, the lightning-arrest unit is connect by the bushing shell for transformer with the transformer winding.
2. the distribution transformer of built-in arrester according to claim 1, which is characterized in that
Several unthreaded holes are uniformly offered on the shell, the lightning-arrest unit is threaded through in the unthreaded hole.
3. the distribution transformer of built-in arrester according to claim 2, which is characterized in that
It is provided with metal cover board above the unthreaded hole, the lightning-arrest unit is fixed on the metal cover board, the metal cover board
For covering the unthreaded hole.
4. the distribution transformer of built-in arrester according to claim 3, which is characterized in that the transformer body also wraps
Cartridge filter is included, the cartridge filter is fixed on the housing, and the lightning-arrest unit is arranged wherein by the cartridge filter.
5. the distribution transformer of built-in arrester according to claim 4, which is characterized in that the lightning-arrest unit includes one
Arrester, the terminals of the arrester are connect with the bottom surface of the cartridge filter.
6. the distribution transformer of built-in arrester according to claim 5, which is characterized in that the terminals of the arrester
For cone or cylindrical structure, the cone or cylindrical structure with the terminals are provided on the bottom surface of the cartridge filter
Corresponding connector, the connector are connect by way of grafting with the terminals.
7. the distribution transformer of built-in arrester according to claim 6, which is characterized in that the connector, transformer
Casing is connected with transformer winding by connecting line.
8. the distribution transformer of built-in arrester according to claim 7, which is characterized in that on the side wall of the cartridge filter
Uniformly open up several filter hole.
9. the distribution transformer of built-in arrester according to claim 8, which is characterized in that open the middle and upper part of the side wall
If the filter hole.
10. the distribution transformer of built-in arrester according to claim 9, which is characterized in that the transformer winding packet
High-voltage winding and low pressure winding are included, the bushing shell for transformer includes bushing and low-tension bushing, and the arrester includes high pressure
End and low-pressure end, wherein
The high-voltage end is connect by the bushing with the high-voltage winding, the low-pressure end by the low-tension bushing with
The low pressure winding connection.
11. the distribution transformer of built-in arrester according to claim 5, which is characterized in that the cartridge filter with it is described
The medial surface or lateral surface of shell connect.
12. the distribution transformer of built-in arrester described in any one of -11 according to claim 1, which is characterized in that the shell
It is full of insulating oil in vivo.
13. the distribution transformer of the built-in arrester according to any one of claim 8-10, which is characterized in that the mistake
The diameter of filter opening is less than or equal to 1mm.
14. the distribution transformer of the built-in arrester according to any one of claim 5-11, which is characterized in that described to keep away
Thunder device is gapless metal-oxide lighting arrester.
15. the distribution transformer of the built-in arrester according to any one of claim 4-11, which is characterized in that the mistake
Filter cylinder is made of insulating materials such as epoxy, nylon.
16. the distribution transformer of the built-in arrester according to any one of claim 4-11, which is characterized in that the gold
Belong to cover board and cartridge filter is connect with the shell by bolted connection.
17. the distribution transformer of the built-in arrester according to any one of claim 7-10, which is characterized in that the company
Insulating layer is provided on wiring lateral surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810555601.7A CN108878123B (en) | 2018-06-01 | 2018-06-01 | Distribution transformer with built-in lightning arrester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810555601.7A CN108878123B (en) | 2018-06-01 | 2018-06-01 | Distribution transformer with built-in lightning arrester |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108878123A true CN108878123A (en) | 2018-11-23 |
| CN108878123B CN108878123B (en) | 2021-07-06 |
Family
ID=64336903
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810555601.7A Active CN108878123B (en) | 2018-06-01 | 2018-06-01 | Distribution transformer with built-in lightning arrester |
Country Status (1)
| Country | Link |
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| CN (1) | CN108878123B (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61190910A (en) * | 1985-02-20 | 1986-08-25 | Hitachi Ltd | Gas insulated transformer |
| US4975797A (en) * | 1989-08-16 | 1990-12-04 | Cooper Industries, Inc. | Arrester with external isolator |
| US5663859A (en) * | 1996-04-16 | 1997-09-02 | Cooper Industries, Inc. | Disconnector switch for disconnecting a high-voltage arrester from ground |
| CN1832065A (en) * | 2005-03-11 | 2006-09-13 | 特变电工衡阳变压器有限公司 | Multipurpose combined protection transformer |
| CN201256042Y (en) * | 2008-07-25 | 2009-06-10 | 中国西电电气股份有限公司 | Insulation construction for zinc bloom resistor valve sheet in oil immersion type transformer |
| CN102169748A (en) * | 2010-01-29 | 2011-08-31 | 株式会社大亨 | Transformer with tap changer |
| CN202093119U (en) * | 2010-12-31 | 2011-12-28 | 保定天威集团有限公司 | Built-in partial discharge monitoring sensor for transformer |
| CN203659607U (en) * | 2013-12-20 | 2014-06-18 | 特变电工沈阳变压器集团有限公司 | Lead and arrester arranging structure in transformer |
| CN106253114A (en) * | 2016-08-04 | 2016-12-21 | 金乡县沃能电控科技有限公司 | A kind of oil-immersed and high-voltage motor switch case |
-
2018
- 2018-06-01 CN CN201810555601.7A patent/CN108878123B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61190910A (en) * | 1985-02-20 | 1986-08-25 | Hitachi Ltd | Gas insulated transformer |
| US4975797A (en) * | 1989-08-16 | 1990-12-04 | Cooper Industries, Inc. | Arrester with external isolator |
| US5663859A (en) * | 1996-04-16 | 1997-09-02 | Cooper Industries, Inc. | Disconnector switch for disconnecting a high-voltage arrester from ground |
| CN1832065A (en) * | 2005-03-11 | 2006-09-13 | 特变电工衡阳变压器有限公司 | Multipurpose combined protection transformer |
| CN201256042Y (en) * | 2008-07-25 | 2009-06-10 | 中国西电电气股份有限公司 | Insulation construction for zinc bloom resistor valve sheet in oil immersion type transformer |
| CN102169748A (en) * | 2010-01-29 | 2011-08-31 | 株式会社大亨 | Transformer with tap changer |
| CN202093119U (en) * | 2010-12-31 | 2011-12-28 | 保定天威集团有限公司 | Built-in partial discharge monitoring sensor for transformer |
| CN203659607U (en) * | 2013-12-20 | 2014-06-18 | 特变电工沈阳变压器集团有限公司 | Lead and arrester arranging structure in transformer |
| CN106253114A (en) * | 2016-08-04 | 2016-12-21 | 金乡县沃能电控科技有限公司 | A kind of oil-immersed and high-voltage motor switch case |
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| Publication number | Publication date |
|---|---|
| CN108878123B (en) | 2021-07-06 |
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