CN104103409B - The field drying processing method of converter power transformer - Google Patents
The field drying processing method of converter power transformer Download PDFInfo
- Publication number
- CN104103409B CN104103409B CN201410280951.9A CN201410280951A CN104103409B CN 104103409 B CN104103409 B CN 104103409B CN 201410280951 A CN201410280951 A CN 201410280951A CN 104103409 B CN104103409 B CN 104103409B
- Authority
- CN
- China
- Prior art keywords
- converter power
- power transformer
- oil
- transformer
- circulation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Abstract
The invention discloses converter power transformer and field drying processing method thereof and field drying processing equipment, its field drying processing method includes the process such as Circulation and Hot Oil Spray 36h, standing 120h after evacuation 120h, vacuum oil 24h, Circulation and Hot Oil Spray 24h, big electric current heating Circulation and Hot Oil Spray 24h simultaneously, heating.The present invention carries out certain time Circulation and Hot Oil Spray process in converter power transformer body after oiling, big electric current heating Circulation and Hot Oil Spray processes; carry out the Circulation and Hot Oil Spray of a period of time the most again; can ensure that the moisture in transformer oil and insulating part assembly is discharged in time; before guaranteeing that converter power transformer puts into operation; Water in oil amount meets the requirements; insulating resistance value meets regulatory requirements, it is ensured that does not haves moisture excess when converter power transformer runs and separates out and affect the situation that transformator runs.
Description
Technical field
The present invention relates to transformer technology field, particularly to a kind of converter power transformer and field drying thereof
Processing method and field drying processing equipment.
Background technology
At present, for the installation of domestic high-power transformer particularly converter power transformer, Oil feeding process and filling
Field drying after oil processes the process all not having complete set.But converter power transformer is pacified at sleeve pipe
Process of assembling may be brought into the moisture in air, and do not have reliable drying step allow after oil-filled
Moisture is discharged in transformer oil and in insulation assembly.And important high-power transformer only can enter after installing
The Circulation and Hot Oil Spray technological measure of row certain time, and transformator do not takes to be dried after oil test is qualified
Transformator is just put into operation by measure, and this cannot be avoided treating that operating transformer exists the risk made moist, and enters
And cause transformator, in debugging or running, internal discharge occurs, even insulation breakdown.
The particularly converter power transformer of large-sized DC power transmission engineering has that power is big, voltage is high, runs
The feature that operating mode is complicated, to transformer oil (i.e. transformer insulation oil) and the moisture of insulation assembly
There is very strict requirement.Therefore, study a set of for the reliable and practical of converter power transformer and
The dry treatment process method being prone to execute-in-place is highly desirable to.
Summary of the invention
In place of above-mentioned the deficiencies in the prior art, it is an object of the invention to provide a kind of change of current transformation
Device and field drying processing method thereof and field drying processing equipment, it is to avoid converter power transformer install after because of
Make moist and cause insulation damages.
In order to achieve the above object, this invention takes techniques below scheme:
A kind of converter power transformer, it includes converter power transformer body, sets in described converter power transformer body
It is equipped with source side winding and valve side winding, between converter power transformer body and source side winding and valve side winding
It is filled with transformer oil, described converter power transformer body is provided with the oil for extracting transformer oil out
Pillow, described conservator is positioned at the top of converter power transformer body.
In described converter power transformer, described converter power transformer body is provided with pouring orifice and fuel-displaced
Mouthful, described pouring orifice and oil-out are in the diagonal position of converter power transformer body, described pouring orifice position
In the bottom of converter power transformer body, oil-out is positioned at the top of mailbox.
In described converter power transformer, the lead-in wire of described source side winding is provided with first sleeve,
It is provided with the second sleeve pipe on the lead-in wire of described valve side winding.
A kind of field drying processing method of above-mentioned converter power transformer, comprising:
A, complete after auxiliary installs at converter power transformer, to converter power transformer body evacuation 120 hours；
B, at converter power transformer, this most internal carries out vacuum oil 24 hours, and this is the most internal to make converter power transformer
It is full of transformer oil；
C, employing hot oil circulating device carry out Circulation and Hot Oil Spray and process at least 24 described converter power transformer body
Hour；
D, enter intrasonic big electric current heater at source side winding side joint, and by valve side short circuit in winding, logical
Crossing short-circuit method heating oil temperature makes temperature of oil in transformer reach 60～70 DEG C of persistent loop 24 hours；
E, remove described intrasonic big electric current heater, proceed Circulation and Hot Oil Spray and process 36 hours,
Make temperature of oil in transformer more than 50 DEG C；
F, remove hot oil circulating device, make that converter power transformer body is quiet puts 120 hours.
In described field drying processing method, described step A also includes: before evacuation timing,
Carry out slip test, it is ensured that vacuum is within 100Pa, and slip is within 30Pa.
In described field drying processing method, in stepb, the oil injecting speed of vacuum oil is 4
t/h-6t/h。
In described field drying processing method, described step C specifically includes:
C1, employing hot oil circulating device carry out Circulation and Hot Oil Spray process to described converter power transformer body；
C2, start timing when temperature of oil in transformer reaches 50 DEG C, and continue Circulation and Hot Oil Spray 24 hours.
In described field drying processing method, the electric current of described intrasonic big electric current heater output
For 700-800A, power frequency is 0.08-0.1Hz.
In described field drying processing method, in step C or D or E, reach 50 DEG C in oil temperature
After, the megger test carrying out converter power transformer body every 12 hours and breakdown voltage test, and
Take transformer oil sample testing moisture content.
A kind of for the field drying processing equipment to above-mentioned converter power transformer, it is characterised in that bag
Include:
Vacuum extractor, for processing converter power transformer body evacuation, described vacuum extractor is even
Connect the conservator of converter power transformer；
Hot oil circulating device, for when vacuum extractor evacuation, flows into converter power transformer body
Transformer oil, and described converter power transformer body is carried out Circulation and Hot Oil Spray heat treated, described deep fat follows
One oil pipe line of loop device connects described pouring orifice, and another oil pipe line connects described oil-out；
Intrasonic big electric current heater, is used for exporting the big electric current of intrasonic and heats described transformer oil,
Described intrasonic big electric current heater connects the lead-in wire of source side winding, and the big electric current of intrasonic adds hot charging
When putting work, use shorting stub by valve side winding short circuit；
Timer, for electric current heater big to vacuum extractor, hot oil circulating device and intrasonic
Working time timing.
Compared to prior art, converter power transformer that the present invention provides and field drying processing method thereof and
Field drying processing equipment, is carried out at certain time Circulation and Hot Oil Spray after oiling in converter power transformer body
Reason, big electric current heating Circulation and Hot Oil Spray processes, and carries out the Circulation and Hot Oil Spray of a period of time, Ke Yibao the most again
Moisture in card transformer oil and insulating part assembly is discharged in time, it is ensured that converter power transformer puts it into operation
Before, Water in oil amount meets the requirements, and insulating resistance value meets regulatory requirements, it is ensured that at converter power transformer
Do not have moisture excess during operation to separate out and affect the situation that transformator runs.And the control of oil temperature
Avoid transformer oil to go bad, transformer oil and then still can use, owing to treatment measures are only being installed
Carry out after link, do not affect the installment work of converter power transformer, the control of cost and time has very
Big advantage, and do not introduce other any risk affecting change of current change operation.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of converter power transformer of the present invention.
Fig. 2 is the flow chart of the field drying processing method of converter power transformer of the present invention.
Fig. 3 be converter power transformer of the present invention field drying processing method in showing when carrying out vacuum oil
It is intended to.
Fig. 4 be converter power transformer of the present invention field drying processing method in carry out Circulation and Hot Oil Spray process time
Schematic diagram.
Fig. 5 be converter power transformer of the present invention field drying processing method in carry out the big electric current of intrasonic and add
Schematic diagram during heat treatment.
Detailed description of the invention
The present invention provides a kind of converter power transformer and field drying processing method thereof and field drying to process and sets
Standby, the insulating oil after relating in converter power transformer Oil feeding process and being oil-filled and the dried of intraware
Technique, this technique can discharge the moisture that converter power transformer invades in installation process, it is ensured that oil-filled mistake
Outside moisture will not be brought in insulating oil by journey, and there is water content, precipitation in reduction insulating oil
The function of moisture in insulating part.
For making the purpose of the present invention, technical scheme and effect clearer, clear and definite, referring to the drawings
The present invention is described in more detail for the embodiment that develops simultaneously.Should be appreciated that described herein being embodied as
Example only in order to explain the present invention, is not intended to limit the present invention.
Referring to Fig. 1, it is the structured flowchart of converter power transformer of the present invention.As it is shown in figure 1, the present invention
Converter power transformer include converter power transformer body 10, described converter power transformer body 10 is provided with net
Side winding (visual angle of Fig. 1 is not shown) and valve side winding (visual angle of Fig. 1 is not shown), become in the change of current
(visual angle of Fig. 1 does not shows to be filled with transformer oil between depressor body 10 and source side winding and valve side winding
Go out), described converter power transformer body 10 is provided with the conservator 20 for extracting transformer oil out, institute
State conservator 20 and be positioned at the top of converter power transformer body 10.
Wherein, described converter power transformer body 10 is provided with pouring orifice 101 and oil-out 102,
Described pouring orifice 101 and oil-out 102 are in the diagonal position of converter power transformer body 10, described note
Hydraulic fluid port 101 is positioned at the bottom of converter power transformer body 10, and oil-out 102 is positioned at the top of mailbox.With
As a example by the front of converter power transformer body 10 is rectangular, described pouring orifice 101 can be located at converter power transformer
The lower right corner (or lower left corner) position of body 10, described oil-out 102 can be located at converter power transformer originally
The lower left corner (or lower right corner) position of body 10, is distributed with diagonal for line of symmetry, makes following to carry out heat
Oil circulation process time, transformer oil from the bottom of converter power transformer body 10 flow into, extract out from top into
Row hot oil circulating device heats, makes transformer oil homogeneous heating.
Referring to Fig. 1, the lead-in wire of described source side winding is provided with first sleeve 103, in institute
State and on the lead-in wire of valve side winding, be provided with the second sleeve pipe 104, for protecting source side winding and valve side winding
Lead-in wire.
The present invention correspondingly provides a kind of scene for above-mentioned converter power transformer carries out field drying and does
Dry processing method, refers to Fig. 2, and it comprises the following steps:
S100, converter power transformer complete auxiliary install after, to converter power transformer body evacuation 120
Hour；
S200, at converter power transformer, this most internal carries out vacuum oil 24 hours, makes converter power transformer body
Interior full transformer oil；
S300, employing hot oil circulating device carry out Circulation and Hot Oil Spray and process extremely described converter power transformer body
Few 24 hours；
S400, enter intrasonic big electric current heater at source side winding side joint, and by valve side short circuit in winding,
Temperature of oil in transformer is made to reach 60～70 DEG C of persistent loop 24 hours by short-circuit method heating oil temperature；
S500, removing described intrasonic big electric current heater, proceeding Circulation and Hot Oil Spray, to process 36 little
Time, make temperature of oil in transformer more than 50 DEG C；
S600, remove hot oil circulating device, make that converter power transformer body is quiet puts 120 hours.
The field drying processing method of the converter power transformer that the present invention provides, can guarantee that not in oiling whole process
Have moisture and enter into inside transformer, it is ensured that before converter power transformer puts into operation, Water in oil amount accords with
Closing requirement, insulating resistance value meets regulatory requirements.And the present invention avoids insulation to the control of oil temperature
Oil (i.e. transformer oil) rotten, insulating oil and then still can use.It addition, the scene of the present invention
Drying method is only carried out after fixing link, does not affect the installment work of converter power transformer, is becoming
There is the biggest advantage in the control of this and time, and do not introduce other any and affect the change of current and become fortune
The risk of row, it is ensured that the safe and stable operation of converter power transformer.
Wherein, in the step s 100, before evacuation timing, slip test is carried out, it is ensured that vacuum
Degree is within 100Pa, and slip is within 30Pa.As it is shown on figure 3, the pipeline of vacuum extractor connects
To conservator top, after completing transformator installation, continue evacuation until oiling terminates.At evacuation
During, the test of slip to be carried out, first converter power transformer is evacuated to about 100Pa, then
Stop evacuation, after 1h is little, read MaLeod gauge value P1, after crossing 30min, read MaLeod gauge value P2,
As residual voltage increment P2-P1≤30Pa, i.e. think that slip is qualified.Start timing afterwards, and maintenance is taken out true
Empty 120 hours.
Then, while evacuation, use hot oil circulating device (such as vacuum oil-filter) with the least
Time 4-6t speed in converter power transformer body, inject qualified transformer oil, and continue 24 hours,
It is as the criterion with actual filling time.
After filling oil, use hot oil circulating device that described converter power transformer body is carried out Circulation and Hot Oil Spray
Process, and start timing when upper strata oil temperature reaches 50 DEG C, and continue Circulation and Hot Oil Spray 24 hours.Please join
Read Fig. 4, when hot oil circulating device carries out Circulation and Hot Oil Spray process to converter power transformer body, by Circulation and Hot Oil Spray
Two pipelines of device connect pouring orifice and oil-out, it is ensured that the oily flow path direction of converter power transformer body is
The mode (flow direction of oil is as shown by the arrows in figure 4) of bottom in and top out, makes the oil of converter power transformer body
Homogeneous heating.
In the present embodiment, due to pouring orifice and oil-out position along converter power transformer body diagonal in
Symmetrical, therefore in circulating-heating processing procedure, also can open oil filter degassing tank and be de-gassed place
Reason.During Circulation and Hot Oil Spray, when the oil temperature of described oil-out is progressively warming up to 50 DEG C, start timing heating
24 hours.
Afterwards, intrasonic big electric current heater is used to access source side winding side, and by short for valve side winding
Road, as it is shown in figure 5, described intrasonic big electric current heater output current frequency be 0.08-0.1Hz,
Size of current is that the electric current of 700-800A carries out big electric current heating, makes oil temperature reach 60～70 DEG C, and continues
Circulate 24 hours.In this enforcement, the size of intrasonic big electric current heater output electric current specifically should regard
Depending on the oil temperature efficiency of heating surface, it is therefore an objective to make oil temperature be climbed between 60 DEG C～70 DEG C, but be not to be exceeded
70℃.The present invention uses the big electric current of intrasonic to heat, and can reduce the induction reactance of converter power transformer,
Thus reduce hot oil circulating device output voltage and power attenuation.
After big electric current heats, remove intrasonic big electric current heater and proceed at Circulation and Hot Oil Spray
Manage 36 hours, it is ensured that the intrinsic oil temperature of converter power transformer is more than 50 DEG C, and this step is also known as strengthening work
Skill, confirms that the moisture in transformer oil meets requirement.
Further, carry out Circulation and Hot Oil Spray process, intrasonic big electric current heat treated and again heat
During oil circulation process, after oil temperature reaches 50 DEG C, converter power transformer body master need to be carried out every 12 hours
The megger test of insulation and breakdown voltage test, and take transformer oil sample testing moisture content, protect
Card insulating resistance value meets requirement, water content persistently reduces and keeps stable；Complete Circulation and Hot Oil Spray afterwards
Treatment process, enters and quiet puts the stage, can carry out relevant commissioning test work after the quiet 120h of putting.
The present invention uses Circulation and Hot Oil Spray to process, intrasonic big electric current heat treated and Circulation and Hot Oil Spray again
The mode processed, owing to hot oil circulating device has the effect of condensed moisture to may insure that converter power transformer exists
The moisture invaded in installation process is discharged, and the change of current can be become by the Circulation and Hot Oil Spray under long-time high temperature
The water analysis of depressor inside insulation is out, it is ensured that operationally do not have moisture at converter power transformer
Excess separates out and affects the situation that transformator runs.
Based on above-mentioned converter power transformer and its field drying processing method, the present invention also provides for a kind of existing
Field equipment for drying, comprising: the big electric current of vacuum extractor, hot oil circulating device, intrasonic adds
Thermal and timer.
Described vacuum extractor connects the conservator of converter power transformer, for taking out converter power transformer body very
Vacancy is managed.
One oil pipe line of described hot oil circulating device connects described pouring orifice, and another oil pipe line connects described
Oil-out, for when vacuum extractor evacuation, flows into transformer oil to converter power transformer body,
And described converter power transformer body is carried out Circulation and Hot Oil Spray heat treated.
Described intrasonic big electric current heater connects the lead-in wire of source side winding, and the big electric current of intrasonic adds
During thermal work, use shorting stub by valve side winding short circuit, be used for exporting the heating of intrasonic big electric current
Described transformer oil.
Described timer, heats for electric current big to vacuum extractor, hot oil circulating device and intrasonic
The working time timing of device.
Further, described field drying processing equipment also includes oil filter degassing tank, in heat
Oil circulation process is de-gassed process.
In sum, the present invention carries out certain time Circulation and Hot Oil Spray in converter power transformer body after oiling
Process, big electric current heating Circulation and Hot Oil Spray processes, and carries out the Circulation and Hot Oil Spray of a period of time the most again, permissible
Ensure that the moisture in transformer oil and insulating part assembly is discharged in time, it is ensured that converter power transformer puts into operation
Before, Water in oil amount meets the requirements, and insulating resistance value meets regulatory requirements, it is ensured that in change of current transformation
Device does not haves moisture excess and separates out and affect the situation that transformator runs when running.And the control of oil temperature
System avoids transformer oil and goes bad, transformer oil and then still can use, due to treatment measures only in peace
Carry out after dress link, do not affect the installment work of converter power transformer, the control of cost and time has
The biggest advantage, and do not introduce other any risk affecting change of current change operation.
It is understood that for those of ordinary skills, can be according to the technology of the present invention
Scheme and inventive concept thereof in addition equivalent or change, and all these change or replace all should belong to
The protection domain of appended claims of the invention.
Claims (4)
1. a field drying processing method for converter power transformer, described converter power transformer, including changing
Convertor transformer body, is provided with source side winding and valve side winding, is changing in described converter power transformer body
It is filled with transformer oil between convertor transformer body and source side winding and valve side winding, becomes in the described change of current
Being provided with the conservator for extracting transformer oil out on depressor body, described conservator is positioned at converter power transformer originally
The top of body；It is characterized in that, including:
A, complete after auxiliary installs at converter power transformer, to converter power transformer body evacuation 120 hours；
B, at converter power transformer, this most internal carries out vacuum oil 24 hours, and this is the most internal to make converter power transformer
It is full of transformer oil；
C, employing hot oil circulating device carry out Circulation and Hot Oil Spray and process at least 24 described converter power transformer body
Hour；Described step C specifically includes:
C1, employing hot oil circulating device carry out Circulation and Hot Oil Spray process to described converter power transformer body；
C2, start timing when temperature of oil in transformer reaches 50 DEG C, and continue Circulation and Hot Oil Spray 24 hours；
D, enter intrasonic big electric current heater at source side winding side joint, and by valve side short circuit in winding, logical
Crossing short-circuit method heating oil temperature makes temperature of oil in transformer reach 60～70 DEG C of persistent loop 24 hours；Described ultralow
The electric current of frequency big electric current heater output is 700-800A, and power frequency is 0.08-0.1Hz；
E, remove described intrasonic big electric current heater, proceed Circulation and Hot Oil Spray and process 36 hours,
Make temperature of oil in transformer more than 50 DEG C；
F, remove hot oil circulating device, make that converter power transformer body is quiet puts 120 hours.
The field drying processing method of converter power transformer the most according to claim 1, its feature
Being, described step A also includes: before evacuation timing, carries out slip test, it is ensured that vacuum
Degree is within 100Pa, and slip is within 30Pa.
The field drying processing method of converter power transformer the most according to claim 1, its feature
Being, in stepb, the oil injecting speed of vacuum oil is 4t/h-6t/h.
The field drying processing method of converter power transformer the most according to claim 1, its feature exists
In, in step C or D or E, after oil temperature reaches 50 DEG C, carried out change of current transformation every 12 hours
The megger test of device body and breakdown voltage test, and take transformer oil sample testing moisture content.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410280951.9A CN104103409B (en) | 2014-06-20 | 2014-06-20 | The field drying processing method of converter power transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410280951.9A CN104103409B (en) | 2014-06-20 | 2014-06-20 | The field drying processing method of converter power transformer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104103409A CN104103409A (en) | 2014-10-15 |
| CN104103409B true CN104103409B (en) | 2016-08-17 |
Family
ID=51671467
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410280951.9A Active CN104103409B (en) | 2014-06-20 | 2014-06-20 | The field drying processing method of converter power transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104103409B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106841952B (en) * | 2017-03-24 | 2023-06-30 | 山东电力设备有限公司 | Device and method for solving partial discharge problem of transformer |
| CN108321712A (en) * | 2018-04-20 | 2018-07-24 | 国网电力科学研究院武汉南瑞有限责任公司 | A kind of transportable transformer device body drying device |
| CN109524198A (en) * | 2018-12-18 | 2019-03-26 | 中国能源建设集团安徽电力建设第二工程有限公司 | A kind of transformer installation method |
| CN109539751B (en) * | 2018-12-26 | 2023-05-30 | 江苏宏宝电力有限公司 | Transformer bushing dehumidification device and use method |
| CN113340073B (en) * | 2021-06-15 | 2022-05-17 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | On-site drying method and drying system for epoxy impregnated paper transformer |
| CN114664514A (en) * | 2022-02-14 | 2022-06-24 | 青海送变电工程有限公司 | Converter transformer heat preservation method and system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103474206A (en) * | 2013-08-26 | 2013-12-25 | 中国广核集团有限公司 | Nuclear power station transformer oil treatment system and method |
| CN103594233A (en) * | 2013-11-29 | 2014-02-19 | 国家电网公司 | 220kV main transformer on-site insulation drying device and technology thereof |
| CN204029564U (en) * | 2014-06-20 | 2014-12-17 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Converter transformer and field drying treatment facility |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04188711A (en) * | 1990-11-21 | 1992-07-07 | Aichi Electric Co Ltd | Method and apparatus for decontamination of transformer using regenerated oil |
-
2014
- 2014-06-20 CN CN201410280951.9A patent/CN104103409B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103474206A (en) * | 2013-08-26 | 2013-12-25 | 中国广核集团有限公司 | Nuclear power station transformer oil treatment system and method |
| CN103594233A (en) * | 2013-11-29 | 2014-02-19 | 国家电网公司 | 220kV main transformer on-site insulation drying device and technology thereof |
| CN204029564U (en) * | 2014-06-20 | 2014-12-17 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Converter transformer and field drying treatment facility |
Non-Patent Citations (1)
| Title |
|---|
| 交—交变频器在变压器低频加热真空干燥工艺中的应用;宣明儒等;《变压器》;19890131(第1期);第16-18页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104103409A (en) | 2014-10-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104103409B (en) | The field drying processing method of converter power transformer | |
| CN103474206B (en) | Nuclear power station transformer oil treatment process | |
| CN104332284A (en) | Hot oil spray and drying device and method for converter transformer | |
| CN102194564B (en) | System and method for drying transformer body | |
| CN104048912A (en) | Ageing testing device and method for insulating paper of power transformer | |
| CN108321712A (en) | A kind of transportable transformer device body drying device | |
| CN204029564U (en) | Converter transformer and field drying treatment facility | |
| CN101950931A (en) | Field dehumidifying method of transformer 110KV capacitive bushing | |
| CN103594233B (en) | A kind of 220kV main transformer scene insulation torrefaction device and technique thereof | |
| US20170321938A1 (en) | Method and system for recovering coolant gas in an air conditioning system | |
| CN105071260A (en) | Insulating property processing method for nuclear power station main transformer after overdue of onsite warehousing | |
| CN205300272U (en) | Industry is heat transfer device for vacuum furnace | |
| CN208081927U (en) | A kind of Electric Power Equipment Insulation oil gas processing device | |
| CN105275539A (en) | Vehicle-mounted heating vehicle and method for preheating engine through vehicle-mounted heating vehicle | |
| CN110470106A (en) | A kind of power cable moisture removal platform and method | |
| EP2453454A1 (en) | Method and plant for manufacturing electrotechnical articles | |
| CN109003787A (en) | A kind of transformer oil intelligent microwave vacuum processing method | |
| JP2002260932A (en) | Method for draining insulating oil in disposal step of transformer and method for cleaning inside of insulation case | |
| CN206116954U (en) | Intelligent cubical switchboard | |
| CN109950037B (en) | Distribution transformer body drying processing variable current power supply device and processing method | |
| US20180347902A1 (en) | Method and system for drying an enclosure | |
| CN106241714A (en) | A kind of portable injection system | |
| CN203813623U (en) | Motor dip-coating device | |
| CN106024317A (en) | High-voltage-class insulating oil purification treatment device and treatment method thereof | |
| CN106841952B (en) | Device and method for solving partial discharge problem of transformer |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |