CN108321712A - A kind of transportable transformer device body drying device - Google Patents
A kind of transportable transformer device body drying device Download PDFInfo
- Publication number
- CN108321712A CN108321712A CN201810360520.1A CN201810360520A CN108321712A CN 108321712 A CN108321712 A CN 108321712A CN 201810360520 A CN201810360520 A CN 201810360520A CN 108321712 A CN108321712 A CN 108321712A
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- CN
- China
- Prior art keywords
- transformer
- unit
- phase
- vacuum
- device body
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- 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.)
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B3/00—Apparatus specially adapted for the manufacture, assembly, or maintenance of boards or switchgear
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B7/00—Drying solid materials or objects by processes using a combination of processes not covered by a single one of groups F26B3/00 and F26B5/00
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/08—Cooling; Ventilating
- H01F27/10—Liquid cooling
- H01F27/12—Oil cooling
- H01F27/14—Expansion chambers; Oil conservators; Gas cushions; Arrangements for purifying, drying, or filling
Abstract
The present invention is dried by the way of module is combined using low frequency heat drying processing module and vacuum kerosene vapor-phase and processing is dried to the power transformer to make moist.Specifically, the present invention provides a kind of transportable transformer device body drying devices, the drying device is dried module composition by low frequency heat drying processing module and vacuum kerosene vapor-phase, the low frequency heat drying processing module mainly heats the deep layer insulation of power transformer body by heating coil, and the vacuum kerosene vapor-phase is dried module and is mainly heated to the outer layer insulation of power transformer body by kerosene steam.Drying device of the present invention simultaneously heats the insulation of the outer layer insulation and deep layer of transformer body, greatly shorten Transformer on Site drying process the time it takes, drying effect can be effectively ensured to device body continuous heating in last vacuumizing phase simultaneously.
Description
Technical field
The present invention relates to transformer dry processing technology field, specially a kind of transportable transformer device body drying device.
Background technology
Core component one of of the transformer as Operation of Electric Systems, good insulation performance are power system security fortune
Capable important leverage.Moisture in insulating materials influences the insulation of converter power transformer, especially UHV converter transformer non-
Chang great.Since the distribution of DC voltage is determined by resistivity of material, the variation of water content directly results in the resistivity of insulating materials
Variation, so as to cause electric field local distortion, it is also possible to guiding discharge breakdown accident, seriously affects the operation of transformer when serious
Safety.
Moisture is mainly gathered in transformer oil and insulating board in transformer.Moisture is mainly derived from manufacture in transformer
The moisture that insulating board degradation with aging generates in moisture and operational process in the air absorbed in installation process, in addition if fortune
Transformer sealing occurs damaged during row, and moisture can be also absorbed from air.
After high-power transformer makes moist, returns factory and processing is dried in the presence of the problems such as time-consuming, costly.With network voltage
Grade is higher and higher, and the capacity of transformer is increasing, and volume weight also increases therewith, returns the consuming of factory's maintenance also increasingly
Greatly.And some substations build up Later Zhou Dynasty, one of the Five Dynasties's surrounding environment and change, and transport difficult is very big.Therefore, generally require at the scene to by
Processing is dried in damp transformer.
The method of field drying transformer mainly has at present：Hot air circulation vacuum drying, drying out by circulating hot oil, Hot Oil Spray
Dry and low frequency heat drying etc., that there are heating temperatures is low for these methods, heating is uneven, processing time is long, drying effect not
The problems such as ideal, is unable to the transformer that the water inlet of processor body is seriously made moist.
Present mobile vacuum coal oil vapor-phase drying device is also applied to scene and processing is dried to transformer, mobile
Formula coal oil vapor-phase drying device mainly heats device body by high-temperature coal oil vapour：High-temperature coal oil vapour encounter temperature compared with
Low device behind, in device body surface condensation heat release, to make device body temperature increase.This heating means can make outer layer insulation
Temperature increases rapidly, but the temperature rise of deep layer insulation is slower, and condensed kerosene can only be leaned on to penetrate into inside insulating part and carried out
Heating.For the transformer of voltage levels, large capacity, the thickness of insulation is very big, and kerosene penetrates into the time of deep layer insulation
Very long, the temperature rise of deep layer insulation is very slow, and the heating time of device body entirety is also very long, and drying process needs to expend long
Time.And moisture in last vacuumizing phase, insulating materials and kerosene evaporation absorb amount of heat, lead to insulation material
Material temperature degree declines very fast.When moisture is higher in device body insulating materials, the also non-evaporating completely of possible moisture, device body temperature is just
It drops to very low, causes remaining moisture to be difficult to evaporate, influence drying effect.
Invention content
In view of the above problems, inventor thinks to need to propose a kind of transportable transformer device body drying device, can accelerate
The heating rate of transformer deep layer insulation shortens dry large-scale power transformer the time it takes, while will also be last
Vacuumizing phase ensures drying effect to device body continuous heating.
Therefore, it is an object of the invention to solve the deficiencies in the prior art, a kind of transportable transformer device body drying is provided
Device, the drying device simultaneously heat the insulation of the outer layer insulation and deep layer of transformer body, greatly shorten large-scale power
Transformer field drying process the time it takes, at the same last vacuumizing phase can be to device body continuous heating, effectively
Ensure drying effect.
To achieve the above object, the present invention can be achieved through the following technical solutions：
The present invention is in such a way that low frequency heat drying processing module and vacuum kerosene vapor-phase drying process module are combined
Processing is dried to the power transformer to make moist.Specifically, the present invention provides a kind of dryings of transportable transformer device body to fill
It sets, the drying device is dried module composition, the low frequency by low frequency heat drying processing module and vacuum kerosene vapor-phase
Heat drying processing module mainly heats the deep layer insulation of power transformer body by heating coil, the vacuum coal
Oil and gas is mutually dried processing module and is mainly heated to the outer layer insulation of power transformer body by kerosene steam.
Further, the low frequency heat drying processing module is single by input transformer, ultralow frequency variable-frequency power sources, measurement
Member, control unit and output end composition, the ultralow frequency variable-frequency power sources respectively with input transformer, measuring unit and control unit
It is electrically connected, the outer end of the measuring unit is output end, and output end and the electric power of the low frequency heat drying processing module become
The high-pressure side of depressor is connected, the low-voltage side coil short circuit grounding of the power transformer, and the low frequency heat drying handles mould
Block achievees the purpose that heat and deep insulate by the coil of low-frequency current h eating power transformer.
Further, described control unit controls ultralow frequency variable-frequency power sources, adjusts the electricity of ultralow frequency power supply output
Pressure, electric current and frequency, and then control unit is realized by controlling the output current of ultralow frequency variable-frequency power sources to control power transformer
The temperature of the winding coil of device.
Further, the no-load voltage ratio of the input transformer is 380V/10kV, the input terminal and 380V of the input transformer
AC power connects, and the output end of the input transformer is connect with ultralow frequency variable-frequency power sources input terminal, by 380V alternating voltages
Rise to voltage needed for ultralow frequency variable-frequency power sources.
Further, the ultralow frequency variable-frequency power sources can be by the frequency conversion of 50Hz power currents at the ultralow frequency electric current of 1Hz.Specifically
Ground, the ultralow frequency variable-frequency power sources are made of rectification circuit, and ultralow frequency variable-frequency power sources can be by 50Hz power current frequency conversions Cheng Chao
Low-frequency current, for being heated to power transformer winding.
Further, the measuring unit includes the voltmeter for measuring voltage and the ammeter for measuring electric current,
For the voltage and current of monitoring ultralow frequency variable-frequency power sources output.
Further, the vacuum kerosene vapor-phase be dried module include vacuum unit, vapour phase unit, condensing unit and
Residual oil at bottom retracting device, the vacuum unit is connect by pipeline with power transformer body and condensing unit respectively, described
Condensing unit is connect by pipeline with vapour phase unit, the vapour phase unit by pipeline respectively with oil tank of transformer and residual oil at bottom
Retracting device connects, and the residual oil at bottom device is connect by pipeline with transformer body.At the vacuum kerosene vapor-phase drying
Module is managed by heating kerosene, high-temperature coal oil vapour is generated and the outer layer insulation of power transformer is heated, and is true by taking out
Sky makes moisture evaporation in insulation come out, to achieve the purpose that dry power transformer.
Further, the vacuum unit includes a propeller pump and two lobe pumps, and the propeller pump is fore pump, institute
Lobe pump is stated to pump for rear class.
Further, the vapour phase unit includes evaporator and distiller, the evaporator inlet and kerosene holding vessel phase
Connection, the steam (vapor) outlet of the evaporator are connected with oil tank of transformer, and kerosene is added thermogenetic high-temperature steam by the evaporator
It is transported in oil tank of transformer, the distiller entrance is connected with condensing unit and residual oil at bottom retracting device respectively by pipeline
It connects, the steam (vapor) outlet of the distiller is connected with oil tank of transformer, and the liquid outlet of the distiller is connected with sump tank, institute
It states distiller to heat the mixing liquid of condensation, makes the lower kerosene evaporation of boiling point, to separate kerosene and transformer oil
Come；The residual oil at bottom retracting device includes filter and oil pump, and the filter is connected with oil tank of transformer bottom, the oil
Pump is connected with distiller.
Further, the condensing unit includes cold, condenser and standing tank, the condenser inlet and vacuum unit
It is connected, the mixed vapour that vacuum unit is extracted out from power transformer tank is condensed into liquid by the condensing unit, by kerosene
Separated with water, the condensator outlet is connected with tank entrance is stood, it is described stand two of tank export respectively with distiller
It is connected with waste water tank.
Transportable transformer device body drying device of the present invention has following advantageous effect：
First, it is readily transported, the present invention is dried mould using low frequency heat drying processing module and vacuum kerosene vapor-phase
Processing is dried to the power transformer to make moist in the mode that block is combined, this kind of modularized design is readily transported, can be used for electricity
The field drying of power transformer is handled；
The second, the efficiency of heating surface is high, and the present invention is dried using low frequency heat drying processing module and vacuum kerosene vapor-phase
Processing is dried to the power transformer to make moist in the mode that module is combined, and the low frequency heat drying processing module is mainly led to
It crosses heating coil to heat the deep layer insulation of power transformer body, while the vacuum kerosene vapor-phase is dried module
Mainly the outer layer insulation of power transformer body is heated by kerosene steam, ensure that insulating materials heating speed and
Uniformity can greatly reduce the heating period required time, effectively improve the efficiency of heating surface, shorten the construction period；
Third, drying effect are good, and the present invention is dried using low frequency heat drying processing module and vacuum kerosene vapor-phase
Processing is dried to the power transformer to make moist in the mode that module is combined, and is on the one hand dried mould in vacuum kerosene vapor-phase
The last vacuumizing phase of block, low frequency heat drying processing module effectively prevent the insulating materials continuous heating of power transformer
Insulating materials temperature is stopped and has declined too fast situation appearance, dry effect has been effectively ensured；On the other hand, it is heated by low frequency
It is dried module and vacuum kerosene vapor-phase is dried module and is heated simultaneously to power transformer, heating has been effectively ensured
Power, even if the temperature of insulating materials can be made to quickly rise to setting value if in the case of environment temperature is lower in winter, in turn
Ensure dry effect.
Description of the drawings
Attached drawing 1 is the structure diagram of transportable transformer device body drying device of the present invention.
Specific implementation mode
In order that those skilled in the art will better understand the technical solution of the present invention, with reference to embodiment and attached drawing
Product of the present invention is described in further detail.
As shown in Figure 1, the present invention is dried module 2 using low frequency heat drying processing module 1 and vacuum kerosene vapor-phase
Processing is dried to the power transformer to make moist in the mode being combined.Specifically, the present invention provides a kind of mobile transformations
Device device body drying device, the drying device are dried module 2 by low frequency heat drying processing module 1 and vacuum kerosene vapor-phase
It constitutes, the low frequency heat drying processing module 1, which mainly insulate to the deep layer of power transformer body by heating coil, to be carried out
Heating, the vacuum kerosene vapor-phase are dried module 2 mainly by kerosene steam to the outer layer insulation of power transformer body
It is heated, and power transformer tank is evacuated to moisture evaporation in high vacuum , Shi Li insulation and is come out, to reach dry transformation
The purpose of device insulation.
As shown in Figure 1, the low frequency heat drying processing module 1 by input transformer 1.1, ultralow frequency variable-frequency power sources 1.2,
Measuring unit 1.4, control unit 1.3 and output end composition, the ultralow frequency variable-frequency power sources 1.2 respectively with input transformer 1.1,
Measuring unit 1.4 and control unit 1.3 are electrically connected, and the outer end of the measuring unit 1.4 is output end, and the low frequency heating is dry
The output end of dry processing module 1 is connected with the high-pressure side of power transformer, the low-voltage side coil short circuit of the power transformer
It is exhausted to reach heat and deep by the coil of low-frequency current h eating power transformer for ground connection, the low frequency heat drying processing module 1
The purpose of edge.Described control unit 1.3 controls ultralow frequency variable-frequency power sources 1.2, the voltage of adjusting ultralow frequency power supply output,
Electric current and frequency, and then realize that control unit 1.3 becomes by controlling the output current of ultralow frequency variable-frequency power sources 1.2 to control electric power
The temperature of the winding coil of depressor.The no-load voltage ratio of the input transformer 1.1 be 380V/10kV, the input transformer 1.1 it is defeated
Enter end to connect with 380V AC powers, output end and 1.2 input terminal of ultralow frequency variable-frequency power sources of the input transformer 1.1 connect
It connects, 380V alternating voltages is risen into voltage needed for ultralow frequency variable-frequency power sources 1.2.The ultralow frequency variable-frequency power sources 1.2 can be by 50Hz
Power current frequency conversion at 1Hz ultralow frequency electric current.Specifically, the ultralow frequency variable-frequency power sources 1.2 is made of rectification circuit, ultralow
Frequency variable-frequency power sources 1.2 can be by the frequency conversion of 50Hz power currents at ultralow frequency electric current, for being heated to power transformer winding.
The measuring unit 1.4 includes the voltmeter for measuring voltage and the ammeter for measuring electric current, ultralow for monitoring
The voltage and current that frequency variable-frequency power sources 1.2 exports.
As shown in Figure 1, the vacuum kerosene vapor-phase be dried module 2 include vacuum unit 2.1, it is vapour phase unit 2.2, cold
Solidifying unit 2.3 and residual oil at bottom retracting device 2.4, the vacuum unit 2.1 respectively by pipeline and power transformer body and
Condensing unit 2.3 connects, and the condensing unit 2.3 is connect by pipeline with vapour phase unit 2.2, and the vapour phase unit 2.2 passes through
Pipeline is connect with oil tank of transformer and residual oil at bottom retracting device 2.4 respectively, and the residual oil at bottom device passes through pipeline and transformation
Device device body connects.The vacuum kerosene vapor-phase is dried module 2 by heating kerosene, generates high-temperature coal oil vapour and becomes to electric power
The outer layer insulation of depressor is heated, and so that moisture evaporation in insulation is come out by vacuumizing, to reach dry power transformer
The purpose of device.The vacuum unit 2.1 includes a propeller pump and two lobe pumps, and the propeller pump is fore pump, sieve
Thatch pump is that rear class pumps.The vapour phase unit 2.2 includes evaporator and distiller, and the evaporator inlet is connected with kerosene holding vessel
It connects, the steam (vapor) outlet of the evaporator is connected with oil tank of transformer, and kerosene is added thermogenetic high-temperature steam defeated by the evaporator
Be sent in oil tank of transformer, the distiller entrance by pipeline respectively with condensing unit 2.3 and residual oil at bottom retracting device 2.4
It is connected, the steam (vapor) outlet of the distiller is connected with oil tank of transformer, liquid outlet and the sump tank phase of the distiller
Even, the distiller heats the mixing liquid of condensation, makes the lower kerosene evaporation of boiling point, thus by kerosene and transformer oil
It leaves and；The residual oil at bottom retracting device 2.4 includes filter and oil pump, the filter and oil tank of transformer bottom phase
Even, the oil pump is connected with distiller.The condensing unit 2.3 includes cold, condenser and standing tank, the condenser inlet
It is connected with vacuum unit 2.1, the mixing that the condensing unit 2.3 extracts vacuum unit 2.1 out from power transformer tank is steamed
Vapour condenses into liquid, and kerosene and water are separated, and the condensator outlet is connected with tank entrance is stood, described to stand the two of tank
A outlet is connected with distiller and waste water tank respectively.
As shown in Figure 1, transportable transformer device body drying device of the present invention is using low frequency heat drying processing module 1 and very
Empty coal oil vapor-phase is dried the mode that module 2 is combined and processing is dried to the power transformer to make moist.Wherein low frequency adds
The operation principle of heated drying processing module 1 is：When processing is dried, first by the short circuit of the low-voltage side coil of power transformer
The high pressure lateral coil of power transformer, is then connected by ground connection with ultralow frequency variable-frequency power sources 1.2.Ultralow frequency variable-frequency power sources 1.2 is produced
Raw low-frequency current flows through the high pressure lateral coil of power transformer, and generates electricity in its low-voltage side coil by electromagnetic induction
Stream.Electric current flows through in coil and generating heat makes coil temperature increase, to make to be wrapped in the insulating materials temperature on coil
It increases.The output current that ultralow frequency variable-frequency power sources 1.2 is adjusted by control unit 1.3, it is effectively anti-to the temperature of control coil
Only coil temperature is excessively high causes insulating materials to be scorched.Vacuum kerosene vapor-phase be dried module 2 operation principle be：Carry out
When drying process, starts vacuum unit 2.1 first, entire pipe-line system is evacuated to high vacuum state, is then shut off vacuum unit
2.1, check the leakproofness of pipe-line system.After confirming that pipe-line system leakproofness reaches requirement, the steaming in vapour phase unit 2.2 is opened
Device is sent out, kerosene is heated to steam condition and is transported in power transformer tank, transformer outer layer insulation material is added
Heat.After pressure reaches certain value in oil tank of transformer, starts vacuum unit 2.1, steam in oil tank of transformer is evacuated to condensation
Unit 2.3 is condensed into liquid by condensing unit 2.3.Natural layering after the liquid of condensation stands a period of time, lower layer is condensed
Water is evacuated to waste water tank storage, and supernatant liquid is evacuated in the distiller of vapour phase unit 2.2 and further fractionates out kerosene and transformer
Oil.In heating process, start residual oil at bottom retracting device 2.4 at regular intervals, by the kerosene condensed in oil tank of transformer and
The transformer oil rinsed is filtered and is evacuated in the distiller of vapour phase unit 2.2 and is fractionated, and kerosene steam continues after fractionation
Into oil tank of transformer heat-insulating material, transformer oil is then pumped down to sump tank storage.When the insulating materials of power transformer
After temperature reaches certain value, vapour phase unit 2.2 is closed, stops heating, and start vacuum unit 2.1 and oil tank of transformer is evacuated to height
Vacuum state, so as to moisture evaporation.In the process can always on low frequency heat drying processing module 1, to the insulation material of transformer
Continuous heating is expected, for preventing insulating materials temperature from declining too fast and then influencing drying effect.
The foregoing is only a preferred embodiment of the present invention, is not intended to limit the present invention in any form；It is all
The those of ordinary skill of the industry can be shown in by specification attached drawing and described above and swimmingly implement the present invention；But it is all
Those skilled in the art without departing from the scope of the present invention, using disclosed above technology contents
The equivalent variations for a little variation, modification and evolution made are the equivalent embodiment of the present invention；Meanwhile it is all according to the present invention
Substantial technological to the variation, modification and evolution etc. of any equivalent variations made by above example, still fall within the present invention's
Within the protection domain of technical solution.
Claims (10)
1. a kind of transportable transformer device body drying device, it is characterised in that：The drying device is handled by low frequency heat drying
Module and vacuum kerosene vapor-phase are dried module composition, and the low frequency heat drying processing module is used for power transformer depth
Layer insulation heating, the vacuum kerosene vapor-phase are dried module and are used to heat power transformer outer layer insulation.
2. transportable transformer device body drying device according to claim 1, it is characterised in that：The low frequency heat drying
Processing module is made of input transformer, ultralow frequency variable-frequency power sources, measuring unit, control unit and output end, the ultralow frequency
Variable-frequency power sources is electrically connected with input transformer, measuring unit and control unit respectively, and the outer end of the measuring unit is output
End, the output end of the low frequency heat drying processing module are connected with the high-pressure side of power transformer, the power transformer
Low-voltage side coil short circuit grounding.
3. transportable transformer device body drying device according to claim 2, it is characterised in that：Described control unit passes through
The output current of ultralow frequency variable-frequency power sources is controlled to control the temperature of the winding coil of power transformer.
4. transportable transformer device body drying device according to claim 3, it is characterised in that：The input transformer
No-load voltage ratio is 380V/10kV.
5. transportable transformer device body drying device according to claim 4, it is characterised in that：The ultralow frequency variable-frequency electric
It source can be by the frequency conversion of 50Hz power currents at the ultralow frequency electric current of 1Hz.
6. transportable transformer device body drying device according to claim 5, it is characterised in that：The measuring unit includes
Voltmeter for measuring voltage and the ammeter for measuring electric current.
7. according to the transportable transformer device body drying device described in any one of claim 1 to 6 claim, feature exists
In：It includes vacuum unit, vapour phase unit, condensing unit and residual oil at bottom recycling dress that the vacuum kerosene vapor-phase, which is dried module,
It sets, the vacuum unit is connect by pipeline with power transformer body and condensing unit respectively, and the condensing unit passes through pipe
Road is connect with vapour phase unit, and the vapour phase unit is connect with oil tank of transformer and residual oil at bottom retracting device respectively by pipeline,
The residual oil at bottom device is connect by pipeline with transformer body.
8. transportable transformer device body drying device according to claim 2, it is characterised in that：The vacuum unit includes
One propeller pump and two lobe pumps, the propeller pump are fore pump, and the lobe pump pumps for rear class.
9. transportable transformer device body drying device according to claim 8, it is characterised in that：The vapour phase unit includes
Evaporator and distiller, the evaporator inlet are connected with kerosene holding vessel, the steam (vapor) outlet and transformer of the evaporator
Fuel tank is connected, and the distiller entrance is connected with condensing unit and residual oil at bottom retracting device respectively by pipeline, the steaming
The steam (vapor) outlet for evaporating device is connected with oil tank of transformer, and the liquid outlet of the distiller is connected with sump tank；The bottom is residual
Oil recovery apparatus includes filter and oil pump, and the filter is connected with oil tank of transformer bottom, the oil pump and distiller phase
Even.
10. transportable transformer device body drying device according to claim 9, it is characterised in that：The condensing unit packet
It includes cold, condenser and stands tank, the condenser inlet is connected with vacuum unit, vacuum unit is taken out from oil tank of transformer
The mixed vapour gone out condenses into liquid, and the condensator outlet is connected with tank entrance is stood, two outlets point for standing tank
It is not connected with distiller and waste water tank.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810360520.1A CN108321712A (en) | 2018-04-20 | 2018-04-20 | A kind of transportable transformer device body drying device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810360520.1A CN108321712A (en) | 2018-04-20 | 2018-04-20 | A kind of transportable transformer device body drying device |
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| CN108321712A true CN108321712A (en) | 2018-07-24 |
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| CN201810360520.1A Pending CN108321712A (en) | 2018-04-20 | 2018-04-20 | A kind of transportable transformer device body drying device |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109950037A (en) * | 2019-04-09 | 2019-06-28 | 沈阳中科瑞达科技有限公司 | A kind of Flow varying power supply device and drying method being dried for distribution transformer body |
| CN111561808A (en) * | 2020-04-14 | 2020-08-21 | 沈阳诚桥真空设备有限公司 | Kerosene vapor phase drying control method and system |
| CN112325601A (en) * | 2020-10-27 | 2021-02-05 | 崔顺甫 | Drying oven for preventing powder particles on surface of tablet from bonding by temperature control |
| CN113834312A (en) * | 2021-10-11 | 2021-12-24 | 山东泰开互感器有限公司 | Gas phase drying process and device for oil-immersed inverted current transformer |
| WO2022267802A1 (en) * | 2021-06-24 | 2022-12-29 | 华能伊敏煤电有限责任公司 | Drying device and method for insulation damping treatment of large ampere-turns current transformer |
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