CN104835628B - With the power high voltage oil-filled mutual inductor device for plugging and its application method of seal closure - Google Patents
With the power high voltage oil-filled mutual inductor device for plugging and its application method of seal closure Download PDFInfo
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- CN104835628B CN104835628B CN201510202175.5A CN201510202175A CN104835628B CN 104835628 B CN104835628 B CN 104835628B CN 201510202175 A CN201510202175 A CN 201510202175A CN 104835628 B CN104835628 B CN 104835628B
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- 238000000034 method Methods 0.000 title claims abstract description 12
- 239000003292 glue Substances 0.000 claims abstract description 132
- 238000002347 injection Methods 0.000 claims abstract description 105
- 239000007924 injection Substances 0.000 claims abstract description 105
- 239000000446 fuel Substances 0.000 claims abstract description 28
- 239000012530 fluid Substances 0.000 claims abstract description 22
- 239000000565 sealant Substances 0.000 claims abstract description 22
- 239000011230 binding agent Substances 0.000 claims abstract description 8
- 238000007789 sealing Methods 0.000 claims abstract description 7
- 238000006243 chemical reaction Methods 0.000 claims description 52
- 230000009467 reduction Effects 0.000 claims description 10
- 238000005259 measurement Methods 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 claims description 2
- 239000004033 plastic Substances 0.000 claims description 2
- 230000005611 electricity Effects 0.000 claims 1
- 238000003466 welding Methods 0.000 abstract description 5
- 239000000853 adhesive Substances 0.000 abstract description 4
- 230000001070 adhesive effect Effects 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 6
- 230000008901 benefit Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
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Abstract
The present invention relates to power high voltage oil-filled mutual inductor device for plugging and its application method with seal closure, device includes oil-filled mutual inductor, seal closure, glue filling device and microprocessor；The oil-filled mutual inductor is used to store the transformer fuel reserve tank of transformer oil including one, there is breakthrough in the transformer fuel reserve tank, the opening edge of the seal closure forms a gas-tight silo along with the lateral wall of transformer fuel reserve tank around the breakthrough by binding agent tight bond；One end of glue filling device is connected with seal closure, is used to the gas-tight silo injection fluid sealant to being formed and blocks breakthrough, and the other end of the glue filling device is electrical connected with the microprocessor.Leak stopping treatment can be carried out with the present apparatus in tape oil, lighted a fire without electric welding, fluid sealant injects fluid sealant in the novel sealing storehouse formed between oil-filled mutual inductor breakthrough and seal closure by injected rubber hose, fluid sealant is full of and keeps certain pressure, fluid sealant is blocked into breakthrough, thoroughly seepage is handled well after adhesive curing to be sealed.
Description
Technical field
The invention belongs to oil-filled mutual inductor leakage of oil process field, the more particularly to power high voltage with seal closure is oil-filled mutually
Sensor device for plugging and its application method.
Background technology
Because manufacture welding, mounting process are bad on transformer wall, there is the defects such as sand holes, weld seam, crack, long-term
In operation, transformer inside oil seepage can be caused, traditional method is after oil-filled mutual inductor is had a power failure, oil in oil-filled mutual inductor to be taken out
Light, is processed using electric welding.
The content of the invention
In view of this, it is an object of the invention to provide a kind of power high voltage oil-filled mutual inductor device for plugging of utilization seal closure
And its application method, fast blockage treatment can be carried out in tape oil with the present apparatus, lighted a fire without electric welding, with traditional leak stopping mode
Compared to there is huge advantage.
The present invention is realized using following scheme：With the power high voltage oil-filled mutual inductor device for plugging of seal closure, including fill
Oily transformer, seal closure, glue filling device and microprocessor；The oil-filled mutual inductor is used to store the mutual of transformer oil including one
There is breakthrough in sensor fuel reserve tank, the transformer fuel reserve tank, the opening edge of the seal closure along with the breakthrough around
The lateral wall of transformer fuel reserve tank forms a gas-tight silo by binding agent tight bond；One end of the glue filling device is close with described
Sealing cover is connected, and is used to fluid sealant and block breakthrough to the gas-tight silo injection for being formed, the other end of the glue filling device with
The microprocessor is electrical connected.
Further, the top of the seal closure is respectively provided with a valve with bottom, and the top of the seal closure is installed
The bottom for having vent valve, the seal closure is provided with rubber injecting valve；One end of the rubber injecting valve is connected to injected rubber hose in glue filling device
One end, when glue filling device works, the rubber injecting valve is opened, and is used to turn on injecting glue path；Put described in when glue filling device works
Air valve is opened, to discharge the gas in seal closure in injecting glue.
Further, the glue filling device include with the frequency conversion glue injection machine of VFC, safety valve, pressure sensor with
And injected rubber hose；One end of the injected rubber hose is connected with the rubber injecting valve on the seal closure, and the other end of the injected rubber hose is connected to
The frequency conversion glue injection machine and described pressure sensor is installed, the frequency conversion glue injection machine is electrically connected to institute with pressure sensor
Microprocessor is stated, the fluid sealant in the frequency conversion glue injection machine injects seal closure by the rubber injecting valve on the injected rubber hose and seal closure
It is interior；The safety valve is provided with the frequency conversion glue injection machine, the injection pressure value for being used to detect when pressure sensor exceedes and sets
Being opened during the safe injection pressure value put carries out safety relief.
Further, the injection pressure value that pressure sensor sends in the microprocessor reception glue filling device, and according to
The injection pressure control program for pre-setting, automatically controls the frequency of frequency conversion glue injection machine, if the injection pressure control program is
When the injection pressure value that the microprocessor is received exceedes the injection pressure value for setting, the microprocessor controls frequency conversion glue injection machine
Injecting glue frequency is reduced, reduction is exerted oneself and slow injecting glue；If the injection pressure value that the microprocessor is received reaches the terminal of setting
During injection pressure value, the rubber injecting valve, frequency conversion glue injection machine and microprocessor are closed, and remove injected rubber hose, injecting glue end-of-job.
The present invention is realized using following methods：With the user of the power high voltage oil-filled mutual inductor device for plugging of seal closure
Method, comprises the following steps：
Step S1：The size of the transformer fuel reserve tank breakthrough according to measurement oil-filled mutual inductor, there is provided one can cover completely
The seal closure of breakthrough；
Step S2：The opening edge edge of seal closure is bonded on the lateral wall of transformer fuel reserve tank by binding agent forms one
Gas-tight silo, the seal closure can be covered the breakthrough on transformer fuel reserve tank and completely；
Step S3：One end of injected rubber hose in glue filling device is connected to the rubber injecting valve of seal closure bottom, the injected rubber hose
The other end be connected to frequency conversion glue injection machine；
Step S4：Open the rubber injecting valve of seal closure bottom and the vent valve on seal closure top；
Step S5：Microprocessor and frequency conversion glue injection machine are opened, the microprocessor control frequency conversion glue injection machine starts injecting glue work
Make, the fluid sealant in the frequency conversion glue injection machine injects transformer fuel reserve tank lateral wall with seal closure formation by the injected rubber hose
In gas-tight silo；
Step S6：During injecting glue, the injection pressure value on pressure sensor collection injected rubber hose, the microprocessor connects
The injection pressure value of pressure sensor collection is received, if the injection pressure value exceedes the injection pressure value for setting, micro- place
Reason device control frequency conversion glue injection machine reduction injecting glue frequency, reduction is exerted oneself and slow injecting glue；If the injection pressure value reaches setting
During terminal injection pressure value, the rubber injecting valve, frequency conversion glue injection machine and microprocessor are closed, and remove injected rubber hose, injecting glue work
Terminate.
Further, during the injecting glue in the step S6, when the vent valve on seal closure top starts to emit plastic emitting
Vent valve is closed, now frequency conversion glue injection machine proceeds injecting glue work.
Further, during the injecting glue in the step S6, if the injection pressure value detected when pressure sensor
During more than the safe injection pressure value for setting, the safety valve installed on the frequency conversion glue injection machine is opened and carries out safety relief.
Compared to prior art, the invention has the advantages that：The present invention is surrounded and tight bond by seal closure
The breakthrough of oil-filled mutual inductor is covered, then the novel sealing storehouse formed between oil-filled mutual inductor breakthrough and seal closure passes through
Frequency conversion glue injection machine is new what is formed between fluid sealant injection oil-filled mutual inductor breakthrough and seal closure by injected rubber hose by fluid sealant
In gas-tight silo, and it is full of, keeps certain pressure, fluid sealant is blocked into breakthrough, after adhesive curing to be sealed, thoroughly handles well and ooze
Leakage.It is of the invention with after traditional leak stopping mode need to take out in light transformer oil again by the way of the electric welding mending-leakage compared with have huge
Advantage.
Brief description of the drawings
Fig. 1 is the power high voltage oil-filled mutual inductor device for plugging scheme of installation with seal closure in the present invention.
Fig. 2 is power high voltage oil-filled mutual inductor schematic diagram in the present invention.
Fig. 3 is power high voltage oil-filled mutual inductor breakthrough leakage of oil schematic diagram in the present invention.
Fig. 4 is seal closure schematic diagram in the present invention.
Fig. 5 is the power high voltage oil-filled mutual inductor device for plugging course of work schematic diagram with seal closure in the present invention.
Fig. 6 is power high voltage oil-filled mutual inductor breakthrough leak stopping completion schematic diagram in the present invention.
Fig. 7 for the present invention in microprocessor according to pressure sensor feedback pressure force value, automatically control frequency conversion glue injection machine work
Functional-block diagram.
Label declaration：1 is frequency conversion glue injection machine；2 is safety valve；3 is pressure sensor；4 is injected rubber hose；5 is seal closure；6
It is binding agent；7 is rubber injecting valve；8 is vent valve；9 is fluid sealant；10 is oil-filled mutual inductor；11 is transformer fuel reserve tank；12 is change
Depressor oil；13 is the breakthrough of transformer fuel reserve tank；14 is high-voltage connection；15 is the transformer oil for leaking out.
Specific embodiment
Below in conjunction with the accompanying drawings and embodiment the present invention will be further described.
The power high voltage oil-filled mutual inductor device for plugging of the utilization seal closure that the present embodiment is provided, as shown in figure 1, including filling
Oily transformer 10, seal closure 5, glue filling device and microprocessor；The oil-filled mutual inductor is used to store transformer oil including one
There is breakthrough 13 in 12 transformer fuel reserve tank 11, the transformer fuel reserve tank 11, the opening edge of the seal closure 5 along with it is described
The lateral wall of the transformer fuel reserve tank around breakthrough 13 forms a gas-tight silo by the tight bond of binding agent 6；The injecting glue dress
The one end put is connected with the seal closure 5, is used to the gas-tight silo injection fluid sealant 9 to being formed and blocks breakthrough 13, the institute
The other end and the microprocessor for stating glue filling device are electrical connected.
In the present embodiment, shown in Fig. 2 and Fig. 3, the transformer fuel reserve tank of the power high voltage oil-filled mutual inductor in the present apparatus
There is breakthrough 13, the transformer oil 12 in transformer fuel reserve tank 11 is leaked out from breakthrough 13.
In the present embodiment, it is described close as shown in figure 4, the top of the seal closure 5 is respectively provided with a valve with bottom
The top of sealing cover is provided with vent valve 8, and the bottom of the seal closure is provided with rubber injecting valve 7；One end of the rubber injecting valve 7 is connected to
One end of injected rubber hose 4 in glue filling device, when glue filling device works, the rubber injecting valve 7 is opened, and is used to turn on injecting glue path；Work as note
The vent valve 8 is opened when adhesive dispenser works, to discharge the gas in seal closure 5 in injecting glue.
In the present embodiment, the glue filling device includes that the frequency conversion glue injection machine 1 with VFC, safety valve 2, pressure are passed
Sensor 3 and injected rubber hose 4；One end of the injected rubber hose 4 is connected with the rubber injecting valve 7 on the seal closure 5, the injected rubber hose 4
The other end is connected to the frequency conversion glue injection machine 1 and is provided with described pressure sensor 3, and the frequency conversion glue injection machine 1 is passed with pressure
Sensor 3 is electrically connected to the microprocessor, and the fluid sealant 9 in the frequency conversion glue injection machine 1 is by the injected rubber hose 4 and seal closure
In the injection seal closure 5 of rubber injecting valve 7 on 5；The safety valve 2 is provided with the frequency conversion glue injection machine 1, is used to work as pressure sensor
Being opened when the 3 injection pressure values for detecting exceed the safe injection pressure value for setting carries out safety relief.
In the present embodiment, the microprocessor receives the injection pressure value of the transmission of pressure sensor 3 in glue filling device, and
Injection pressure control program according to pre-setting automatically controls the frequency of frequency conversion glue injection machine 1, the injection pressure control program
If exceed the injection pressure value for setting for the injection pressure value of microprocessor reception, the microprocessor control frequency conversion note
The reduction injecting glue frequency of glue device 1, reduction is exerted oneself and slow injecting glue；If the injection pressure value that the microprocessor is received reaches setting
During terminal injection pressure value, the rubber injecting valve 7, frequency conversion glue injection machine 1 and microprocessor are closed, and remove injected rubber hose, injecting glue work
Work terminates.
In the present embodiment, with seal closure power high voltage oil-filled mutual inductor device for plugging application method, see Fig. 5,
Shown in Fig. 6 and Fig. 7, comprise the following steps：
Step S1：The size of the transformer fuel reserve tank breakthrough 13 according to measurement oil-filled mutual inductor, there is provided one can cover completely
The firmly seal closure 5 of breakthrough；
Step S2：The opening edge edge of seal closure 5 is bonded in by shape on the lateral wall of transformer fuel reserve tank 11 by binding agent 6
Into a gas-tight silo, the seal closure 5 can be covered the breakthrough 13 on transformer fuel reserve tank and completely；
Step S3：One end of injected rubber hose 4 in glue filling device is connected to the rubber injecting valve 7 of seal closure bottom, the injecting glue
The other end of pipe 4 is connected to frequency conversion glue injection machine 1；
Step S4：Open the rubber injecting valve 7 of seal closure bottom and the vent valve 8 on seal closure top；
Step S5：Microprocessor and frequency conversion glue injection machine 1 are opened, the microprocessor control frequency conversion glue injection machine 1 starts injecting glue
Work, the fluid sealant 9 in the frequency conversion glue injection machine injects transformer fuel reserve tank lateral wall and seal closure 5 by the injected rubber hose 4
In the gas-tight silo of formation；
Step S6：During injecting glue, the injection pressure value on the collection injected rubber hose 4 of pressure sensor 3, the microprocessor
The injection pressure value of pressure sensor collection is received, it is described micro- if the injection pressure value exceedes the injection pressure value for setting
Processor control frequency conversion glue injection machine 1 reduces injecting glue frequency, and reduction is exerted oneself and slow injecting glue；If the injection pressure value reaches setting
Terminal injection pressure value when, close the rubber injecting valve 7, frequency conversion glue injection machine 1 and microprocessor, and remove injected rubber hose, injecting glue
End-of-job.
In the present embodiment, preferably, before the present apparatus carries out leak stopping, staff can field observation breakthrough crack feelings
Condition, such as slotted opening are larger, first should be entered crack riveting after small in the breakthrough 13 according to riveting after small again with instruments such as iron hammer, pliers
Row dimensional measurement.Especially, during injecting glue, when no pressure in seal closure 5 or low pressure, glue injection machine is exerted oneself greatly, injecting glue
Hurry up, with the carrying out that injecting glue works, when fluid sealant 9 will be full of seal closure, be particularly completely filled with seal closure in fluid sealant 9
When, injection pressure is raised rapidly, and now microprocessor controls frequency conversion glue injection machine 1 to remain slightly above oil-filled mutual inductor body
The pressure of interior oil pressure carries out injecting glue of releiving, until injecting glue end-of-job, now fluid sealant 9 injects and by injected rubber hose 4 full of filling
In the gas-tight silo formed between oily transformer breakthrough and seal closure 5, the holding certain pressure of fluid sealant 9 being full of will block seepage
Point 13, after adhesive curing to be sealed, you can thoroughly handle seepage well.
In the present embodiment, during the injecting glue in the step S6, when the vent valve 8 on seal closure top starts to emerge
Vent valve is closed during glue, now frequency conversion glue injection machine 1 proceeds injecting glue work.
In the present embodiment, during the injecting glue in the step S6, if the injecting glue pressure detected when pressure sensor
When force value exceedes the safe injection pressure value for setting, the safety valve 2 installed on the frequency conversion glue injection machine 1 is opened carries out safe letting out
Pressure.
The foregoing is only presently preferred embodiments of the present invention, all impartial changes done according to scope of the present invention patent with
Modification, should all belong to covering scope of the invention.
Claims (3)
1. with the power high voltage oil-filled mutual inductor device for plugging of seal closure, it is characterised in that：Including oil-filled mutual inductor, sealing
Cover, glue filling device and microprocessor；The oil-filled mutual inductor is used to store the transformer fuel reserve tank of transformer oil, institute including one
State transformer fuel reserve tank and there is breakthrough, the opening edge of the seal closure along with the breakthrough around transformer fuel reserve tank
Lateral wall forms a gas-tight silo by binding agent tight bond；One end of the glue filling device is connected with the seal closure, is used to
Gas-tight silo to being formed injects fluid sealant and blocks breakthrough, the other end and the microprocessor electricity of the glue filling device
Property be connected；
The top of the seal closure is respectively provided with a valve with bottom, and the top of the seal closure is provided with vent valve, described
The bottom of seal closure is provided with rubber injecting valve；One end of the rubber injecting valve is connected to one end of injected rubber hose in glue filling device, works as injecting glue
Device rubber injecting valve unlatching when working, is used to turn on injecting glue path；When glue filling device works, the vent valve is opened, and is used to
The gas in seal closure is discharged in injecting glue；
The glue filling device includes the frequency conversion glue injection machine with VFC, safety valve, pressure sensor and injected rubber hose；It is described
One end of injected rubber hose is connected with the rubber injecting valve on the seal closure, and the other end of the injected rubber hose is connected to the frequency conversion glue injection machine
And described pressure sensor is installed, the frequency conversion glue injection machine is electrically connected to the microprocessor, institute with pressure sensor
The fluid sealant in frequency conversion glue injection machine is stated by the rubber injecting valve injection seal closure on the injected rubber hose and seal closure；The frequency conversion note
The safety valve is provided with glue device, the injection pressure value for being used to be detected when pressure sensor exceedes the safe injecting glue pressure for setting
Being opened during force value carries out safety relief；
The microprocessor receives the injection pressure value of pressure sensor transmission in glue filling device, and according to the injecting glue for pre-setting
Pressure control program, automatically controls the frequency of frequency conversion glue injection machine, if the injection pressure control program is the microprocessor connecing
When the injection pressure value of receipts exceedes the injection pressure value for setting, the microprocessor control frequency conversion glue injection machine reduction injecting glue frequency,
Reduction is exerted oneself and slow injecting glue；If the injection pressure value that the microprocessor is received reaches the terminal injection pressure value of setting,
The rubber injecting valve, frequency conversion glue injection machine and microprocessor are closed, and removes injected rubber hose, injecting glue end-of-job；
The application method of the power high voltage oil-filled mutual inductor device for plugging of described utilization seal closure, comprises the following steps：
Step S1：The size of the transformer fuel reserve tank breakthrough according to measurement oil-filled mutual inductor, there is provided one can completely cover seepage
The seal closure of point；
Step S2：The opening edge edge of seal closure is bonded in by binding agent a sealing is formed on the lateral wall of transformer fuel reserve tank
Storehouse, the seal closure can be covered the breakthrough on transformer fuel reserve tank and completely；
Step S3：One end of injected rubber hose in glue filling device is connected to the rubber injecting valve of seal closure bottom, the injected rubber hose it is another
One end is connected to frequency conversion glue injection machine；
Step S4：Open the rubber injecting valve of seal closure bottom and the vent valve on seal closure top；
Step S5：Microprocessor and frequency conversion glue injection machine are opened, the microprocessor control frequency conversion glue injection machine starts injecting glue work, institute
The fluid sealant stated in frequency conversion glue injection machine injects the sealing that transformer fuel reserve tank lateral wall is formed with seal closure by the injected rubber hose
In storehouse；
Step S6：During injecting glue, the injection pressure value on pressure sensor collection injected rubber hose, the microprocessor receives pressure
The injection pressure value of force snesor collection, if the injection pressure value exceedes the injection pressure value for setting, the microprocessor
Control frequency conversion glue injection machine reduction injecting glue frequency, reduction is exerted oneself and slow injecting glue；If the injection pressure value reaches the terminal of setting
During injection pressure value, the rubber injecting valve, frequency conversion glue injection machine and microprocessor are closed, and remove injected rubber hose, injecting glue end-of-job.
2. the power high voltage oil-filled mutual inductor device for plugging of utilization seal closure according to claim 1, it is characterised in that：
During injecting glue in the step S6, vent valve is closed when the vent valve on seal closure top starts to emit plastic emitting, now frequency conversion
Glue injection machine proceeds injecting glue work.
3. the power high voltage oil-filled mutual inductor device for plugging of utilization seal closure according to claim 1, it is characterised in that：
During injecting glue in the step S6, if when the injection pressure value that pressure sensor is detected exceedes the safe injecting glue pressure for setting
During force value, the safety valve installed on the frequency conversion glue injection machine is opened and carries out safety relief.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510202175.5A CN104835628B (en) | 2015-04-27 | 2015-04-27 | With the power high voltage oil-filled mutual inductor device for plugging and its application method of seal closure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510202175.5A CN104835628B (en) | 2015-04-27 | 2015-04-27 | With the power high voltage oil-filled mutual inductor device for plugging and its application method of seal closure |
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| Publication Number | Publication Date |
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| CN104835628A CN104835628A (en) | 2015-08-12 |
| CN104835628B true CN104835628B (en) | 2017-07-07 |
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| CN201510202175.5A Active CN104835628B (en) | 2015-04-27 | 2015-04-27 | With the power high voltage oil-filled mutual inductor device for plugging and its application method of seal closure |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104821253B (en) * | 2015-05-20 | 2017-03-08 | 国家电网公司 | Electric power SF with sealed chamber6The online device for plugging of primary cut-out and method |
| CN111412283A (en) * | 2020-03-31 | 2020-07-14 | 鞍钢股份有限公司 | Method for blocking leakage point of sulfuric acid container under pressure |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE9216331U1 (en) * | 1992-12-01 | 1993-02-11 | Furmanite Gmbh, 6230 Frankfurt | Leak sealing device for pipelines |
| CN1200065C (en) * | 2001-12-17 | 2005-05-04 | 中国石油天然气集团公司 | Sealing agent used for high temp. pressuriced leakage blocking and its use method |
| CN200997359Y (en) * | 2007-01-20 | 2007-12-26 | 林晓铭 | Online reverse osmose sealing leakage cap of electric-power air and oil filler |
| CN201803052U (en) * | 2010-08-09 | 2011-04-20 | 西安石油大学 | Spherical plugging device |
| CN102431116A (en) * | 2011-10-20 | 2012-05-02 | 东莞市天赛塑胶机械有限公司 | Injection molding machine with subdivision controllable glue injection pressure and using method for injection molding machine |
| CN203423032U (en) * | 2013-08-01 | 2014-02-05 | 国家电网公司 | On-line intelligent oil supplementation device for transformer |
| CN103824680A (en) * | 2014-03-03 | 2014-05-28 | 国家电网公司 | On-line intelligent oil recharging device and method for electric oil-charged transformer |
| CN204558199U (en) * | 2015-04-27 | 2015-08-12 | 国家电网公司 | Use the power high voltage oil-filled mutual inductor device for plugging of seal closure |
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