CN104332284A - Hot oil spray and drying device and method for converter transformer - Google Patents
Hot oil spray and drying device and method for converter transformer Download PDFInfo
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- CN104332284A CN104332284A CN201410548402.5A CN201410548402A CN104332284A CN 104332284 A CN104332284 A CN 104332284A CN 201410548402 A CN201410548402 A CN 201410548402A CN 104332284 A CN104332284 A CN 104332284A
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Abstract
The invention discloses a hot oil spray and drying device for a converter transformer. The hot oil spray and drying device for the converter transformer comprises an oil supply device, a spray pipe, a vacuum unit, a drying air generator and a converter transformer body, wherein a sealing chamber is arranged on the periphery of the converter transformer body, the sealing chamber comprises an upper cover installed on the upper side, a spray pipeline is installed on the upper cover and is respectively communicated with the oil supply device and the sealing chamber, the vacuum unit and the drying air generator are respectively communicated with the sealing chamber, three insulating pieces which are used for inspecting the drying effect of the sealing chamber are installed in the sealing chamber, the insulating pieces are respectively installed at the bottom of a tap switch of the converter transformer, the bottom of windings and the top of the windings, and a heating plate is installed on the lower side of the sealing chamber. The invention further discloses a hot oil spray and drying method of the converter transformer, which comprises the steps of insulating oil filling, normal-pressure hot oil spray, vacuum pumping and vacuum release. The hot oil spray and drying device and method for the converter transformer have the advantages of quick spray speed, thorough drying, high reliability and practicability and easiness in field operation.
Description
Technical field
The present invention relates to transformer technology field, be specifically related to a kind of converter transformer Hot oil spray drying device and method.
Background technology
Converter transformer (being called for short the change of current to become) is the capital equipment of DC transmission system, and its major parameter is determined by the particular/special requirement of direct current system.The effect of converter transformer is to converter supply AC power or accepts AC power from converter, and net top-cross stream voltage transformation is become the voltage required for valve side.As the contact of AC network and HVDC network, more not only phase difference to be provided to be the 12 pulse wave alternating voltages of 30 ° for valve Room equipment with common transformer, also to there is larger impedance, be used for the invasion of limiting AC system to dominant systems, the structure that this decision change of current becomes comparatively common transformer is distinguished to some extent, changes heavy, larger relative to the common transformer change of current.Just because of change of current variant is large, Heavy Weight, especially for remoteness, the change of current becomes the very inconvenient regional change of current of transport and becomes, be not easy to return repair in shop after change of current accident barrier multiple, field repair will be carried out time most of, field repair is very strict to the process requirements such as environment, technique, and after particularly repairing, the drying of device body is difficult point in overhaul and emphasis.
At present, for the installation of domestic high-power transformer particularly converter transformer, Oil feeding process and oil-filled after field drying process all there is no the process structure of complete set.But converter transformer may bring the moisture in air in sleeve pipe installation process, and moisture is discharged in not having reliable drying step by transformer oil after oil-filled and in insulation assembly.And important high-power transformer installs the rear Circulation and Hot Oil Spray technological measure that only can carry out certain hour, and transformer does not take drying step just to be put into operation by transformer after oil test is qualified, this cannot be avoided treating that operating transformer exists the risk of making moist, and then cause transformer to occur internal discharge in debugging or running, or even insulation breakdown.
Particularly the converter transformer of large-sized DC power transmission engineering has the advantages that power is large, voltage is high, operating condition is complicated, has very strict requirement to the moisture of transformer oil (i.e. transformer insulation oil) and insulation assembly.Therefore, study a set of for the reliable and practical of converter transformer and the drying process device being easy to execute-in-place be necessary very much.
Summary of the invention
In order to solve the problem, an object of the present invention is to provide a kind of converter transformer Hot oil spray drying device, and it covers on being directly installed on by spray pipeline, and matches with vacuum pump set and dry air, reliable and practical, is easy to execute-in-place.
For realizing above object, the technical scheme that the present invention takes is:
A kind of converter transformer Hot oil spray drying device, it comprises: fueller, spray piping, vacuum pump set, dry air generator and converter transformer body, wherein, the periphery of described converter transformer body is a sealed chamber, described sealed chamber comprises the upper cover that is mounted thereon side, spray pipeline for spraying deep fat in described sealed chamber is installed on and covers and be connected with sealed chamber with fueller respectively, for vacuumizing with by the vacuum pump set out of the moisture discharge in sealed chamber and be used for injecting dry air to sealed chamber and be connected with sealed chamber respectively with dry air generator sealed chamber being carried out to vacuum breaker process to sealed chamber, three insulating parts for checking sealed chamber's drying effect are installed in sealed chamber, described insulating part is installed on change of current variation respectively and connects bottom switch, bottom winding and winding top, the downside of described sealed chamber is provided with heating plate.
Described fueller comprises oil tank, vacuum oil purifier and spray thrower, and the oil in described oil tank injects sealed chamber after vacuum oil purifier purification, and the oil injected in described sealed chamber enters spray pipeline after being heated by spray thrower again.
Described spray pipeline comprises main spray pipeline and a spray pipeline, described main spray pipeline is fixed on and covers and be connected with the oil outlet end of spray thrower, described spray pipeline to be arranged in sealed chamber and to be connected with main spray pipeline, and the shower nozzle of described spray pipeline is corresponding is respectively arranged at the upper end that the change of current becomes iron core, valve leading-out terminal and net leading-out terminal.
Described sealed chamber is provided with further at least one net side and raises seat and valve side rising seat; be respectively used to the lead-in wire protecting converter transformer source side winding and valve side winding; wherein, described net side rising seat is fixedly installed in and covers, and described valve side raises seat and is fixedly installed on the side of sealed chamber.
The side bottom of described sealed chamber is provided with an entry/exit hydraulic fluid port, described entry/exit hydraulic fluid port is connected with vacuum oil purifier, for to oiling in sealed chamber, and described entry/exit hydraulic fluid port being connected with spray thrower, after oiling in sealed chamber being heated by spray thrower, enter spray pipeline.
Pipeline between described vacuum pump set and sealed chamber is installed a pressure vacuum ga(u)ge.
The periphery of described sealed chamber is wrapped by heat-preservation cotton.
Another object of the present invention is to provide a kind of converter transformer Hot oil spray drying method, it, by controlling parameters such as time of spray drying and temperature, reaches the object that change of current desiccation is respond well, simultaneously reliable and practical, be easy to execute-in-place, increase work efficiency.
For realizing above object, the technical scheme that the present invention takes is:
Converter transformer Hot oil spray drying method, it comprises the following steps:
Step 1, insulating oil inject: open the passage between vacuum oil purifier and entry/exit hydraulic fluid port, insulating oil in oil tank is directly injected sealed chamber after vacuum oil purifier purification, the volume injecting the insulating oil of sealed chamber is not less than 1/5th of sealed chamber's capacity, after spray oil has injected, remove oil tank and vacuum oil purifier;
Step 2, normal pressure Hot Oil Spray: open the passage between entry/exit hydraulic fluid port and spray thrower, open spray thrower, carry out insulating oil circulation, check whether operation is normal, if normal, then drop into two groups of heaters, run and within 1 hour, check whether work well, if, then open institute's having heaters and carry out continuous heating, until insulation oil temperature reaches 110 DEG C, exit section heaters, when the oil temperature that insulate reaches 120 DEG C, one group of heater is only kept to heat, described heater has seven groups, all be arranged in spray thrower, continue spray 12 hours, exit heater after insulation oil temperature declines, stop spray, close spray thrower flowline valve,
Step 3, to vacuumize: open the condenser of vacuum pump set and the valve opened between vacuum pump set and sealed chamber vacuumizes, first the primary pump in vacuum pump set is opened, the booster pump in vacuum pump set is opened when pressure in sealed chamber is reduced to below 2000Pa, continue to vacuumize 10 hours, stop vacuumizing;
Step 4, releasing vacuum: open dry air generator and the valve opened between dry air generator and sealed chamber, dry air generator is utilized to carry out releasing vacuum treatment to sealed chamber, continue to remove 2, vacuum as a child, stop removing vacuumizing;
Repeat step 2-4 at least eight circulation, complete converter transformer Hot oil spray drying.
In step 1, insulating oil injects before sealed chamber must meet following condition: water content in oil≤10mg/L and oil gassiness≤1% and puncture voltage >=60kV.
And only in normal pressure Hot Oil Spray process, open all heating plates.
Remove the dry air dew point that vacuum uses in step 4 and be not more than-55 DEG C.
After completing converter transformer Hot oil spray drying, the criterion qualified to drying comprises:
The water content of insulating part is not more than 0.5%;
The water yield of sealed chamber is lower than 8ml/h;
In vacuum, the spray oil that vacuum pump set is discharged from condenser and cold oil water content are all less than 20ppm;
Continuous iron core-clamp insulation the resistivity measurements recorded for three times successively between difference be not more than 5M Ω, continuous iron core-clamp insulation resistivity measurements of measuring for three times are in the circulation of three continuous print Hot Oil Spray, measure after removing vacuum before normal pressure Hot Oil Spray.
Compared with prior art, the invention has the advantages that:
1, the present invention spray pipeline is directly installed on sealed chamber on cover, only spray pipeline directly need be connected with fueller during use, vacuum pump set, dry air generator are communicated with can realize spray drying with sealed chamber simultaneously, while reliable and practical, be easy to execute-in-place.
2, Hot oil spray drying method of the present invention is by relevant parameters such as set temperature, time, pressure, reaches the object that change of current desiccation is respond well, increases work efficiency simultaneously.
3, the present invention sprays position mainly for iron core in dried journey, also arrange mouth spray in valve outlet and net leading-out terminal simultaneously, form umbrella cover 120 DEG C spray, abandon spray point only for the single spray mode of iron core, make spray rate fast, thoroughly dry.
4, a kind of reference and reference is provided for later high-power transformer or the change of current become field drying.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of converter transformer Hot oil spray drying of the present invention device;
Fig. 2 is the flow chart of converter transformer Hot oil spray drying method of the present invention.
Wherein: 1, sealed chamber; 11, upper cover; 12, entry/exit hydraulic fluid port; 13, heating plate; 2, oil tank; 3, vacuum oil purifier; 4, spray thrower; 5, main spray pipeline; 51, spray pipeline is propped up; 6, net side and raise seat; 7, valve side raises seat; 8, vacuum pump set; 81, pressure vacuum ga(u)ge; 9, dry air generator.
Embodiment
Below in conjunction with the drawings and specific embodiments, content of the present invention is described in further details.
Embodiment
1, prepare before dry process
The drying of converter transformer body mainly becomes the materials such as the insulating part of body interior and carries out drying to the change of current, caused by field condition, can only become to transform a little to the change of current and then carry out Hot Oil Spray work.
The method that we take is become shower nozzle case lid being installed spray to the change of current, by shower nozzle by the Hot Oil Spray of temperatures as high 120 DEG C in sealed chamber 1, thus reach the object that the change of current becomes annex drying in case, each spray head connects each point of branch oil pipe, divide branch oil pipe to gather again and be connected to total spray oil pipe, total spray oil pipe is connected with the oil-out of Hot Oil Spray machine, transformer oil after Hot Oil Spray converges in the change of current and becomes at the bottom of case, be back in spray thrower by the change of current oil-out become at the bottom of case and flow out from spray thrower oil-out again after heating, which forms the process of Hot Oil Spray.
Specifically please refer to shown in Fig. 1, a kind of converter transformer Hot oil spray drying device, it comprises: fueller, spray piping, vacuum pump set 8, dry air generator 9 and converter transformer body, wherein, the periphery of converter transformer body is the structure of a sealed chamber 1, sealing chamber 1 comprises the upper cover 11 be arranged on the upside of it, and the spray pipeline for spraying deep fat in sealed chamber 1 is installed on upper cover 11 and is also connected with sealed chamber 1 with fueller respectively.Fueller comprises oil tank 2, vacuum oil purifier 3 and spray thrower 4, (insulation) oil in oil tank 2 purifies through vacuum oil purifier 3 and injects sealed chamber 1, oiling in sealed chamber 1 enters spray pipeline after being heated by spray thrower 4 again, concrete oiling and spray all complete by an entry/exit hydraulic fluid port 12, this entry/exit hydraulic fluid port 12 is arranged at the bottom of sealed chamber 1 side, first this entry/exit hydraulic fluid port 12 is connected with oil tank 2 by vacuum oil purifier 3, the oil in oil tank 2 is made to inject sealed chamber 1 through purification, now, entry/exit hydraulic fluid port 12 plays the effect of oil-feed, simultaneously, this entry/exit hydraulic fluid port 12 is connected with spray thrower 4, now, remove vacuum oil purifier 3 and oil tank 2, after the oil of oil tank 2 injection in entry/exit hydraulic fluid port 12 is heated by spray thrower 4, sprayed in sealed chamber 1 by spray pipeline again, form the spray process of an Inner eycle, now, entry/exit hydraulic fluid port 12 plays fuel-displaced effect.For vacuumizing sealed chamber 1 with by the moisture discharge of sealed chamber 1 vacuum pump set 8 out and be used for injecting dry air to sealed chamber 1 and be all connected with sealed chamber 1 with the dry air generator 9 sealed chamber 1 being carried out to vacuum breaker process, a pressure vacuum ga(u)ge 81 is set between vacuum pump set 8 and sealed chamber 1.
Upper cover 11 carries out the installation of spray nozzle, this upper cover 11 directly adopts the change of current to become case lid, it itself is the case lid of sealing, only need to carry out punching welding spray piping, mounting spray head, spray pipeline comprises main spray pipeline 5 and a spray pipeline 51, main spray pipeline 5 to be fixed on upper cover 11 and to be connected with the oil outlet end of spray thrower 4, spray pipeline 51 to be arranged in sealed chamber 1 and to be connected with main spray pipeline 5, because sealed chamber 1 is larger, main spray pipeline 5 can arrange multiple, each main spray pipeline 5 can connect multiple spray pipelines 51, and each spray pipeline 51 can arrange multiple shower nozzle, prop up spray pipeline 51 can crisscrossly be arranged in sealed chamber 1 to realize uniform spraying, the shower nozzle of spray pipeline 51 respectively correspondence is arranged at the change of current and becomes iron core, the upper end of valve leading-out terminal and net leading-out terminal, position is sprayed mainly for iron core in process, heat transfer is passed through after heating iron core, heat is expanded from inside to outside, coil outer insulation mean temperature can reach 90 DEG C.We also arrange mouth spray in valve outlet and net leading-out terminal simultaneously, and form umbrella cover 120 DEG C spray, the temperature of this part reaches 110 DEG C, abandon spray point only for the single spray mode of iron core, make spray rate fast, thoroughly dry.
Because during Hot Oil Spray, insulating oil declines because heat that the change of current becomes distributes temperature, for ensureing that the insulating oil oil of spray remains on higher temperature always, ensure the effect of spray, be aided with spray heat-preservation cotton and be prevented from scattering and disappearing of heat, and install heating plate 13 additional, heating plate 13 adopts electric boiling plate structure, is usually laid on bottom sealed chamber 1, by heating to transformer bottom, thus increase temperature to spray oil, ensure spraying effect.Electric boiling plate must be laid on fireproof material (as asbestos shingle), simultaneously and the change of current become the distance keeping ten cm at the bottom of case, at a distance of the effect too far not reaching heating, too closely may cause damage to sealed chamber 1 apart.
Heat-preservation cotton is used fire protection flame retarding insulation material, becoming outside whole sealed chamber 1, the change of current being become whole sealed chamber 1 and wrapping, by sealed chamber 1 and isolate from outer air, preventing heat loss by being laid on the change of current.
The equipment mainly used during Hot Oil Spray has spray thrower 4, vacuum pump set 8, dry air generator 9, vacuum oil purifier 3.Arrange 7 groups of heater composition heating units in spray thrower 4, these 7 groups of heaters divide four large groups, three groups, amount to 350kW heating electric power, can realize multiple combination comparatively smooth adjustment heating power; Spray pump adopts frequency control, can the flow of smooth adjustment oil, and spray thrower 4 is as the capital equipment during Hot Oil Spray, carry the groundwork of spray oil heat cycles, spray thrower is linked in spray piping, because spray thrower power is comparatively large, needs enough jumbo power supply and power line.
The preparation of spray insulating oil, spray transformer oil accounts for 1/5 of whole sealed chamber 1 volume, container according to each sealed chamber 1 determines spray oil mass, spray transformer oil must be qualified transformer oil (according to prerun standard), preferably new transformer oil carries out circulating filtration, must become the normal insulating oil same model used with the change of current simultaneously.
The installation of temp probe in sealed chamber 1, has installed two temp probes in case, be installed on bottom the covert interior winding top of the change of current and winding respectively, for monitoring the variations in temperature in sealed chamber 1.
The installation of insulation sample block in sealed chamber 1, the change of current becomes in case has installed three insulation sample blocks, being installed on change of current variation respectively and connecing bottom switch, bottom winding and winding top, becoming case inner drying effect for checking the change of current.
Fire prevention measure, Hot Oil Spray scene is put and is made enough fire extinguishers, and whether the fire hydrant near inspection and fire hose can normally use.
The net side that sealed chamber 1 is provided with raises seat 6 and valve side raises seat 7; be respectively used to the lead-in wire protecting converter transformer source side winding and valve side winding; wherein, net side raises seat 6 and is fixedly installed on upper cover 11, and valve side raises seat 7 and is fixedly installed on the side of sealed chamber 1.
2, drying means
2.1, Hot oil spray drying handling principle
The principle of Hot Oil Spray is as Fig. 1, utilize spray thrower 4 that spray oil is heated to about 115 ± 5 DEG C, case lid top spray is become from the change of current by spray piping deep fat, become bottom oil return valve from the change of current again and enter spray thrower, then enter the change of current through the heating of spray thrower and become case lid top spray and enter in sealed chamber 1; That so goes round and begins again continues 12 hours Hot Oil Spray, stop Hot Oil Spray vacuumizing in sealed chamber 1, continue to vacuumize 10 hours, main purpose is extracted out by the steam in sealed chamber 1, stopping vacuumizes, and carries out vacuum breaker with dry air generator to sealed chamber 1.
2.2, drying method process
Please refer to shown in Fig. 2, converter transformer Hot oil spray drying method, it comprises the following steps:
S01, spray oil inject: open the passage between vacuum oil purifier 3 and entry/exit hydraulic fluid port 12, insulating oil in oil tank 2 is directly injected sealed chamber 1 after vacuum oil purifier 3 purifies, the volume injecting the insulating oil of sealed chamber 1 is not less than 20% of sealed chamber 1 capacity, after spray oil has injected, remove oil tank 2 and vacuum oil purifier 3.Insulating oil injects before the change of current becomes must meet following condition, water content in oil≤10mg/L, gassiness≤1% in oil, puncture voltage >=60kV.
S02, normal pressure Hot Oil Spray: Hot Oil Spray is carried out at ambient pressure (because spray pump cannot work under vacuum state again), open the passage between entry/exit hydraulic fluid port 12 and spray thrower 4, open spray thrower 4, carry out insulating oil circulation, check whether operation is normal, input two groups of heaters are carried out in all normal situations, run 1h and check whether work well, open all heaters when all devices normal operation and carry out continuous heating, until oil temperature arrives 110 DEG C, exit section heaters, when oil temperature reaches 120 DEG C, maintenance one group of heater is only needed to carry out heating and thermal insulation.
During Hot Oil Spray, open all heating plates 13, whether the variations in temperature simultaneously in close observation sealed chamber 1 is normal.Every one hour, record is carried out to the difference temperature in spray oil oil temperature, change of current sealed chamber 1.Continue spray 12 hours, exit heater after oil temperature declines, stop spray, close spray thrower flowline valve, exit heating plate 13.
S03, to vacuumize: Hot Oil Spray vacuumized after 12 hours, first the condenser of vacuum pump set 8 is opened and the valve opened between vacuum pump set 8 and sealed chamber 1 vacuumizes, first primary pump is opened, booster pump is opened when pressure again in sealed chamber 1 is reduced to below 2000Pa, vacuumize period, every hour record pressure.Continue to vacuumize 10 hours, stop vacuumizing, closing duct valve.Collect condensate liquid simultaneously, analyze.
S04, releasing vacuum: open dry air generator 9 and the valve opened between dry air generator 9 and sealed chamber 1, dry air generator 9 pairs of sealed chamber 1 are utilized to carry out releasing vacuum treatment, continue to remove 2, vacuum as a child, stop removing vacuumizing, the dry air dew point that releasing vacuum uses should below-55 DEG C.
Step S02-step S04 completes converter transformer Hot oil spray drying after carrying out repeatedly repetitive cycling operation.
3, drying method analysis
3.1, Hot Oil Spray process analysis procedure analysis
Hot Oil Spray is carried out, so take the method that Hot Oil Spray (12h)-vacuumize (10h)-contact vacuum (2h) circulates to carry out converter transformer body drying due under the state that used spray thrower can not be vacuum in sealed chamber 1.
Oil temperature can be heated to about 115 ± 5 DEG C (as shown in table 1) rapidly by spray thrower, compare Hot Oil Spray temperature of the same type higher, first spray oil self can not contain moisture, moisture can evaporate rapidly at such high temperatures by the insulating part that secondly spray oil sprays, again, temperature is high can shorten drying time; Become case lid to the change of current to transform, install multiple spray head additional, the abundant spray of spray oil to insulating parts all in sealed chamber 1 can be ensured.
Table 1 Hot Oil Spray record sheet
After having carried out the spray of 12 hours, stop Hot Oil Spray, vacuumize, the insulation simultaneously having heat-preservation cotton quilt because spray oil oil temperature is higher, the change of current becomes internal temperature and still remains on more than 70 DEG C (as table 1) during vacuumizing, therefore vacuumize period not only can by Hot Oil Spray during the steam that produces extract out, because the boiling point of water also reduces under high vacuum state, the spilling of moisture in insulating part can also be aggravated.
Because Hot Oil Spray needs to carry out under atmospheric pressure state, need after evacuation to remove vacuum, because be in high vacuum state in sealed chamber 1, the gas production removing vacuum sealed chamber 1 capacity and dry air generator calculates the time of removing required for vacuum, control the size of valve well, allow dry air fully enter as far as possible, ensure no longer to bring moisture into, because under high vacuum state, air inflow is excessive, exceed the gas production of dry air generator, can cause and not have the air through fully dry to enter sealed chamber 1, insulating part is made moist again.In addition remove vacuum be conducive to enlivening the hydrone in device body because through after a while vacuumize drying after, under low pressure steam partial pressure reduce slowly.Vacuumize again after removing vacuum, can steam partial pressure be reduced, easily make the hydrone in insulation excessive.
3.2, the dry Basic Criteria terminated
Drying terminate rear to drying effect whether qualified judge following according at least to comprise:
One, Hot Oil Spray (12h)-vacuumize (10h)-contact vacuum (2h) drying method at least more than 8 circulations.
Two, in cooling device spray oil, cold oil, water content is less than 20ppm; What vacuumize that unit discharges in the early stage from condenser is oil water mixture, and the later stage is substantially all oil.So can only check the oil that condensation produces, check moisture.
Three, the continuous iron core-clamp insulation resistivity measurements recorded for three times successively between difference be not more than 5M Ω, continuous iron core-clamp insulation resistivity measurements of measuring for three times is in three continuous print Hot Oil Spray circulations, measure before normal pressure Hot Oil Spray after removing vacuum, namely in continuous print three circulation, all carry out one-shot measurement before normal pressure Hot Oil Spray after each releasing vacuum; The insulation resistance value stabilization of iron core-folder illustrates that in insulating part, moisture is discharged substantially, and insulation values tends towards stability.
Four, in sealed chamber 1 water yield lower than 8ml/h.Calculate moisture in condensed water, water yield should lower than this value.
Five, the water content of each insulating part is not more than 0.5%.
3.3, dry results and analysis
Table 2: iron core folder insulation measurement data
Table 4: the micro-water number certificate of spray oil, cold oil
Can find out that drying continue for 10 days by table 2, in the several leading sky of drying process, iron core folder and the instability of insulating resistance value over the ground thereof, backmost the iron core folder insulating resistance value of several days tends towards stability, and insulation resistance difference is less than 5M Ω.Because now iron core folder be not in dew dummy status, be not immersed in transformer oil, all above insulation resistance numerical value is less.
The water content of what table 3 reacted the is cold oil of discharging in spray oil and vacuum pump set condenser, all 20ppm can be less than from the micro-water content of spray oil and cold oil, also can calculate the content of water from the discharge rate of oil water mixture, the water speed of discharging in sealed chamber 1 is far smaller than 8ml/h.
In sum, this time dry result meets all criterions, can stop spray.Test through finally becoming the change of current also illustrates that this time dry process is very successful.
The increase of the operation time limit become along with domestic high-power transformer and the change of current, increasing high-power transformer and the change of current become to be needed to carry out field overhaul, there is the restriction of such-and-such condition in field overhaul, particularly be difficult at the scene the processing stage of drying implement, the Hot oil spray drying device that the present invention adopts and drying method, comprise the preparation before drying, dry run, the dry judgement terminated, provides a kind of reference and reference for later high-power transformer or the change of current become field drying.
Above-listed detailed description is illustrating for possible embodiments of the present invention, and this embodiment is also not used to limit the scope of the claims of the present invention, and the equivalence that all the present invention of disengaging do is implemented or changed, and all should be contained in the scope of the claims of this case.
Claims (10)
1. a converter transformer Hot oil spray drying device, it is characterized in that, it comprises: fueller, spray piping, vacuum pump set (8), dry air generator (9) and converter transformer body, wherein, the periphery of described converter transformer body is a sealed chamber (1), described sealed chamber (1) comprises the upper cover (11) that is mounted thereon side, spray pipeline for spray deep fat in described sealed chamber (1) is installed on upper cover (11) and goes up and be connected with sealed chamber (1) with fueller respectively, for vacuumizing to be connected with sealed chamber (1) respectively by the moisture discharge vacuum pump set out (8) in sealed chamber (1) and for injecting dry air to sealed chamber (1) with the dry air generator (9) sealed chamber (1) being carried out to vacuum breaker process to sealed chamber (1), three insulating parts for checking sealed chamber (1) drying effect are installed in sealed chamber (1), described insulating part is installed on change of current variation respectively and connects bottom switch, bottom winding and winding top, the downside of described sealed chamber (1) is provided with heating plate (13).
2. converter transformer Hot oil spray drying device according to claim 1, it is characterized in that, described fueller comprises oil tank (2), vacuum oil purifier (3) and spray thrower (4), oil in described oil tank (2) injects sealed chamber (1) after vacuum oil purifier (3) purification, and the oil injected in described sealed chamber (1) is again by entering spray pipeline after spray thrower (4) heating.
3. converter transformer Hot oil spray drying device according to claim 2, it is characterized in that, described spray pipeline comprises main spray pipeline (5) and a spray pipeline (51), described main spray pipeline (5) is fixed on upper cover (11) and is gone up and be connected with the oil outlet end of spray thrower (4), described spray pipeline (51) to be arranged in sealed chamber (1) and to be connected with main spray pipeline (5), and the shower nozzle of described spray pipeline (51) is corresponding is respectively arranged at the upper end that the change of current becomes iron core, valve leading-out terminal and net leading-out terminal.
4. converter transformer Hot oil spray drying device according to claim 2, it is characterized in that, the side bottom of described sealed chamber (1) is provided with an entry/exit hydraulic fluid port (12), described entry/exit hydraulic fluid port (12) is connected with vacuum oil purifier (3), for to sealed chamber (1) interior oiling, and described entry/exit hydraulic fluid port (12) being connected with spray thrower (4), for by sealed chamber (1) interior oiling by entering spray pipeline after spray thrower (4) heating.
5. converter transformer Hot oil spray drying device according to claim 1, is characterized in that, the periphery of described sealed chamber (1) is wrapped by heat-preservation cotton.
6. converter transformer Hot oil spray drying method, is characterized in that, it comprises the following steps:
Step 1, insulating oil inject: open the passage between vacuum oil purifier (3) and entry/exit hydraulic fluid port (12), insulating oil in oil tank (2) is directly injected sealed chamber (1) after vacuum oil purifier (3) purification, the volume injecting the insulating oil of sealed chamber (1) is not less than 1/5th of sealed chamber (1) capacity, after spray oil has injected, remove oil tank (2) and vacuum oil purifier (3);
Step 2, normal pressure Hot Oil Spray: open the passage between entry/exit hydraulic fluid port (12) and spray thrower (4), open spray thrower (4), carry out insulating oil circulation, check whether operation is normal, if normal, then drop into two groups of heaters, run and within 1 hour, check whether work well, if, then open institute's having heaters and carry out continuous heating, until insulation oil temperature reaches 110 DEG C, exit section heaters, when the oil temperature that insulate reaches 120 DEG C, one group of heater is only kept to heat, described heater has seven groups, all be arranged in spray thrower (4), continue spray 12 hours, exit heater after insulation oil temperature declines, stop spray, close spray thrower flowline valve,
Step 3, to vacuumize: open the condenser of vacuum pump set (8) and the valve opened between vacuum pump set (8) and sealed chamber (1) vacuumizes, first the primary pump in vacuum pump set (8) is opened, the booster pump in vacuum pump set (8) is opened when pressure in sealed chamber (1) is reduced to below 2000Pa, continue to vacuumize 10 hours, stop vacuumizing;
Step 4, releasing vacuum: open dry air generator (9) and the valve opened between dry air generator (9) and sealed chamber (1), dry air generator (9) is utilized to carry out releasing vacuum treatment to sealed chamber (1), continue to remove 2, vacuum as a child, stop removing vacuumizing;
Repeat step 2-4 at least eight circulation, complete converter transformer Hot oil spray drying.
7. converter transformer Hot oil spray drying method according to claim 6, it is characterized in that, in step 1, insulating oil injects sealed chamber (1) frontly must meet following condition: water content in oil≤10mg/L and oil gassiness≤1% and puncture voltage >=60kV.
8. converter transformer Hot oil spray drying method according to claim 6, is characterized in that, and only in normal pressure Hot Oil Spray process, open all heating plates (13).
9. converter transformer Hot oil spray drying method according to claim 6, is characterized in that, removes the dry air dew point that vacuum uses and be not more than-55 DEG C in step 4.
10. converter transformer Hot oil spray drying method according to claim 6, is characterized in that, after completing converter transformer Hot oil spray drying, the criterion qualified to drying comprises:
The water content of insulating part is not more than 0.5%;
The water yield of sealed chamber (1) is lower than 8ml/h;
In vacuum, the spray oil that vacuum pump set (8) is discharged from condenser and cold oil water content are all less than 20ppm;
Continuous iron core-clamp insulation the resistivity measurements recorded for three times successively between difference be not more than 5M Ω, continuous iron core-clamp insulation resistivity measurements of measuring for three times are in the circulation of three continuous print Hot Oil Spray, measure after removing vacuum before normal pressure Hot Oil Spray.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410548402.5A CN104332284A (en) | 2014-10-16 | 2014-10-16 | Hot oil spray and drying device and method for converter transformer |
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| CN201410548402.5A CN104332284A (en) | 2014-10-16 | 2014-10-16 | Hot oil spray and drying device and method for converter transformer |
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| CN201410548402.5A Pending CN104332284A (en) | 2014-10-16 | 2014-10-16 | Hot oil spray and drying device and method for converter transformer |
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| CN105977014A (en) * | 2016-06-27 | 2016-09-28 | 河南平高通用电气有限公司 | Drying method of current transformer coil |
| CN106225990A (en) * | 2016-09-05 | 2016-12-14 | 山东电力设备有限公司 | A kind of vacuum dew point intelligent monitoring device |
| CN107181016A (en) * | 2017-01-05 | 2017-09-19 | 福建猛狮新能源科技有限公司 | A kind of fogging oil heat-exchange apparatus and heat change method for battery |
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| CN111634527A (en) * | 2020-05-29 | 2020-09-08 | 广东能建电力设备厂有限公司 | Transformer body storage device and method for storing transformer body |
| CN111716609A (en) * | 2020-07-08 | 2020-09-29 | 常州佳冠电子有限公司 | Pouring equipment and pouring process for capacitor epoxy resin |
| WO2023151273A1 (en) * | 2022-02-14 | 2023-08-17 | 青海送变电工程有限公司 | Heat preservation method and system for converter transformer |
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| CN105977014A (en) * | 2016-06-27 | 2016-09-28 | 河南平高通用电气有限公司 | Drying method of current transformer coil |
| CN105977014B (en) * | 2016-06-27 | 2019-01-22 | 河南平高通用电气有限公司 | A kind of drying means of current mutual inductor coil |
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| CN106225990B (en) * | 2016-09-05 | 2022-03-08 | 山东电力设备有限公司 | Method for monitoring by using vacuum dew point intelligent monitoring device |
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| CN111634527B (en) * | 2020-05-29 | 2022-06-21 | 广东能建电力设备厂有限公司 | Method for storing transformer body |
| CN111716609A (en) * | 2020-07-08 | 2020-09-29 | 常州佳冠电子有限公司 | Pouring equipment and pouring process for capacitor epoxy resin |
| CN111716609B (en) * | 2020-07-08 | 2022-04-05 | 常州佳冠电子有限公司 | Pouring equipment and pouring process for capacitor epoxy resin |
| WO2023151273A1 (en) * | 2022-02-14 | 2023-08-17 | 青海送变电工程有限公司 | Heat preservation method and system for converter transformer |
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Application publication date: 20150204 |