CN102194564B - System and method for drying transformer body - Google Patents
System and method for drying transformer body Download PDFInfo
- Publication number
- CN102194564B CN102194564B CN 201010120986 CN201010120986A CN102194564B CN 102194564 B CN102194564 B CN 102194564B CN 201010120986 CN201010120986 CN 201010120986 CN 201010120986 A CN201010120986 A CN 201010120986A CN 102194564 B CN102194564 B CN 102194564B
- Authority
- CN
- China
- Prior art keywords
- transformer
- kerosene
- oil tank
- evaporator
- drying
- 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
Images
Landscapes
- Drying Of Solid Materials (AREA)
Abstract
The invention discloses a system and a method for drying a transformer body. The system comprises a transformer oil tank which is used for accommodating the transformer body and transformer oil, a vacuumizing device which is connected with the transformer oil tank and is used for vacuumizing the transformer oil tank to enable the transformer oil tank to form a vacuum chamber after the transformer oil tank is emptied, an evaporator which is connected with the transformer oil tank and is used for guiding kerosene steam formed by heating kerosene into the transformer oil tank to dry the transformer body, and a recycling device which is connected with the transformer oil tank and the evaporator and is used for condensing the kerosene steam recycled from the transformer oil tank into the kerosene and water after the transformer body is subjected to the drying treatment and returning the kerosene to the evaporator. By the system and the method, the transformer body is dried by the kerosene steam in the transformer oil tank, the drying time is short, the drying efficiency is high, and the drying effect is desirable.
Description
Technical field
The present invention relates to transformer body drying system and method, relate in particular to a kind of transformer body drying system and method for dry transformer.
Background technology
The device of transformer a lot of solid insulating materials that distributed with it, for example, the turn-to-turn insulation of coil, stay, cushion block, laminated paper board trim ring and fiber core etc., these insulating material all are by cellulosic insulating material.An inherent characteristic of insulating material is exactly after making moist or soaking, and can very seriously affect the water content of electrical strength, dielectric loss and the oil of material medium.
Fig. 1 is the schematic diagram that concerns of the mass fraction of the water of insulating board under different temperature and flashover voltage.As shown in Figure 1, after the water content of the dielectric of transformer increased, the dielectric characteristic will change, and the larger then flashover voltage of water content is less.Fig. 2 is the schematic diagram that concerns of the mass fraction of water of insulating board and dielectric loss angle.As depicted in figs. 1 and 2, the water content of the dielectric of transformer increases, and originally the field intensity by desirable state of insulation design may change.So the water content of insulating material is determining the insulation level of a transformer to a great extent, thereby affect the safe and stable operation of transformer integral body.
The new transformer that assembles must be processed through super-dry before dispatching from the factory, and to remove moisture and the gas in the insulating material, its water content is controlled within the scope of requirement, to guarantee transformer enough dielectric strengths is arranged.
For the moisture in the insulating part of transformer is comparatively fast discharged, the common mode that adopts is gas clean-up and improves temperature in factory.The purpose of gas clean-up mainly is the pressure of lowering device body surrounding environment, is conducive to like this moisture in its fine pore of insulating material and becomes steam and spread from insulating material and move, and discharges from insulating material at last; The purpose that improves temperature mainly is to improve the steam partial pressure of insulating material.20 ℃ of the every raisings of insulating material temperature, its steam partial pressure can improve more than the twice, so in the identical situation of water content, temperature is higher, diffusion effect is better.The result of diffusion discharges outside the insulating material moisture, thereby has improved the degree of drying of insulating part, improves electrical strength.Equally, the purpose that gas clean-up reduces insulating material surrounding space pressure also is in order to fall low-moisture saturated steam dividing potential drop, and vacuum degree is higher, and the saturated steam dividing potential drop of moisture is lower, and moisture is evaporation more easily, insulating material drying faster.So these two modes all are in order to accelerate the drying of insulating part, to improve drying efficiency.
And for the transformer that moves, be subjected to the restrictions such as transportation condition and power failure cost, often need site examining and repairing.So device body insulating material can contact with atmosphere, the inevitable moisture absorption of insulating material is made moist and is affected the quality of transformer.After maintenance is finished, need to carry out field drying to transformer and process.For the transformer of the serious watered and wetting of device body, also some can only adopt the field drying technology to process.
The field drying transformer method has Cycling hot-blast heating boulton process and hot oil seasoning etc. at present.The dry technology heating-up temperature of on-site conventional is low, inhomogeneous, the processing time is long, transformer that still can not the serious watered and wetting of processor body; Drying effect is often not satisfactory.
Cycling hot-blast heating vacuumize is that processed transformer coil or device body are placed in the vacuum drying tank, and the hot-air that then will be no more than 115 ℃ is sent into vacuum drying tank, heating transformer coil or device body.Adopt the circulating air mode, adopt heating (improve temperature and accelerate the moisture evaporation) and improve vacuum (in the low situation of temperature, accelerating the moisture evaporation to improve vacuum) and repeatedly hocket.
Mainly contain two kinds of different modes, the one, transformer is contained in the fuel tank, put together hothouse into, after being entered by oil filler, hot-air loops.Vacuum stages is to carry out in oil tank of transformer and immersion oil in fuel tank.Another is that transformer body is put into vacuum drying tank, and circulation is sent into hot blast and carried out the drying of vacuum stages in the vacuum tank.
Cycling hot-blast heating vacuumize has air to exist owing to adopt heated-air drying, is easy to cause the aging of insulating material when temperature is higher, and for fear of wearing out of insulating material, heating-up temperature is generally at 115 ℃.Although temperature and coal oil vapor-phase drying only differ 20 ℃, drying effect is but mutually far short of what is expected.The employing circulating air is dry, the moisture in the insulation can be reduced to 1～3% about by 8% under the general condition.
When processing EHV transformer, at first use Hot-blast Heating about 40 hours, then vacuumize 10～15 hours, thereafter every heating vacuumized 10～15 hours in 10～20 hours again, repeatedly carried out.Number of times repeatedly depends on electric pressure and the insulation system situation of transformer.In general, electric pressure is higher, and capacity is larger, and number of times repeatedly is more.This is because gap, ultrahigh voltage transformer oil crack is less, and the more more complicated causes of insulating barrier.Therefore for superhigh pressure, large capacity, insulating barrier is many but also thick transformer not only, and Cycling hot-blast heating vacuumize also is difficult to thoroughly dry, and arid cycle is very long.This method does not have cleaning action substantially in addition, is not suitable for the drying of reprocessing transformer.
As shown in Figure 3, be the employed structural representation of existing oil drying, the circulation hot oil drying is inserted transformer 90 in the drying chamber 91 first, then after utilizing circulating pump 92 that the insulating oil in the degasser 93 is heated by heater 94, in the input drying chamber 91.
This method is except obtaining the vaporization water insulating material that heat brings transformer with deep fat, and dry cardinal principle is to utilize the balance of oilpaper water content.Fig. 4 is insulating oil and the equilibrium relation schematic diagram that is immersed in the water content between the insulating paper in the oil, if shown in, under different temperatures, insulating oil and be immersed in the equilibrium relation of the water content between the insulating paper in the oil.When deep fat during with transformer insulated dipping, both water content are uneven, and the moisture in the insulating paper spreads in oil, and to equilibrium conversion, water content in oil content increases gradually by imbalance.Oil flows, and the oil that water content is larger is removed moisture by heater and drying device, and then sends into vacuum drying tank, back and forth carries out incessantly, and makes the insulating material of transformer obtain drying.
The oil drying method mainly is the equilibrium relation by paper and Water in oil amount, and this equilibrium process is very slow, although although also vacuumize during oil drying, purpose is to prevent the oil deterioration that insulate.This method moisture diffusion is slow, and drying time is long, and efficient is very low.
So the drying time of existing drying mode is long, drying efficiency is low, and drying effect is poor.
Summary of the invention
The objective of the invention is the defective for existing drying system and drying means, a kind of drying system and drying means are provided, utilize kerosene steam that the transformer body in the transformer is carried out drying, drying time is short, and drying efficiency is high, and drying effect is good.
For achieving the above object, the invention provides a kind of transformer body drying system, described system comprises:
Oil tank of transformer is used for accommodating transformer body and transformer oil;
Vacuum extractor is connected with described oil tank of transformer, is used for vacuumizing behind the emptying described transformer oil of described oil tank of transformer, so that described oil tank of transformer forms vacuum chamber;
Evaporator, with described oil tank of transformer to being connected, the kerosene steam that is used for kerosene is added thermosetting imports described oil tank of transformer, and described transformer body is carried out drying processing;
Retracting device is connected with described evaporator with described oil tank of transformer, and the kerosene steam-condensation to described transformer body is dry after processing that is used for reclaiming in the described oil tank of transformer is processed into kerosene and water, and kerosene is returned described evaporator.
For achieving the above object, the present invention also provides a kind of transformer body drying means, and described method comprises:
The oil tank of transformer that is equipped with transformer body is vacuumized;
The kerosene steam that kerosene in the evaporator is added thermosetting imports oil tank of transformer, processes described transformer body is dry;
Kerosene steam-condensation after the drying that retracting device will reclaim in the described oil tank of transformer is processed is processed into kerosene and water, and kerosene is returned described evaporator.
Drying system of the present invention and method are utilized kerosene steam in oil tank of transformer transformer body to be carried out drying and are processed, and drying time is short, and drying efficiency is high, and drying effect is good.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, the accompanying drawing of required use was done to introduce simply during the below will describe embodiment, apparently, accompanying drawing in the following describes only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the schematic diagram that concerns of the mass fraction of the water of insulating board under different temperature and flashover voltage;
Fig. 2 is the schematic diagram that concerns of the mass fraction of water of insulating board and dielectric loss angle;
Fig. 3 is the employed structural representation of existing oil drying;
Fig. 4 is insulating oil and the equilibrium relation schematic diagram that is immersed in the water content between the insulating paper in the oil;
Fig. 5 is the structural representation of drying system embodiment one of the present invention;
Fig. 6 is the structural representation of transformer body drying system embodiment two of the present invention;
Fig. 7 is the structural representation of transformer body drying system embodiment three of the present invention;
Fig. 8 is vapour phase dry run curve chart of the present invention;
Fig. 9 is the structural representation of transformer body drying system embodiment four of the present invention;
Figure 10 is the flow chart of transformer body drying means of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
Drying system of the present invention and drying means, utilize the fuel tank of transformer self and do not need to recycle existing vacuum tank, and heating transformer device body is to utilize kerosene steam, kerosene steam can carry out heat exchange to transformer body, and when kerosene steam becomes kerosene, can also emit the heat of condensation, device body that like this can more efficient heating transformer.Can carry out drying to transformer body very easily thus, be particularly useful for the drying of transformer body at the scene.
Fig. 5 is the structural representation of drying system embodiment one of the present invention, and as shown in the figure, drying system embodiment one of the present invention specifically comprises evaporator 1, oil tank of transformer 2, retracting device 3 and vacuum extractor 5.
The effect of oil tank of transformer 2 is accommodating transformer body 20 and transformer oil.Vacuum extractor 5 is connected with oil tank of transformer 1, vacuumizes behind oil tank of transformer 1 emptying transformer oil, so that oil tank of transformer 1 forms vacuum chamber; Evaporator 1 is connected with oil tank of transformer 2, effect is that the kerosene that will inject evaporator 1 heats, after forming kerosene steam the kerosene steam is imported oil tank of transformer 2, utilize the kerosene steam to transformer body 20 heating, thereby transformer insulating material is with it carried out drying and dehydrating.
The kerosene steam that utilizes that moves in circles like this carries out the drying processing to the insulating material on the transformer body 20.
Concrete processing procedure is at first to utilize 5 pairs of oil tank of transformer 2 of vacuum extractor to vacuumize, then the kerosene steam that 1 pair of kerosene heating of evaporator is generated imports 2 li of oil tank of transformer, utilizing the kerosene steam that the transformer body 20 in the oil tank of transformer 2 is carried out heat drying processes, thereby the moisture in the insulating material of transformer body 20 is deviate from, kerosene steam after dry the processing is recovered device 3 and reclaims, carry out condensation process, generate kerosene and water after the kerosene steam condensing is processed, kerosene can be annotated in the evaporator 1.
So drying system embodiment one of the present invention utilizes kerosene steam in oil tank of transformer transformer body to be carried out drying and processes, drying time is short, and drying efficiency is high, and drying effect is good.
Fig. 6 is the structural representation of transformer body drying system embodiment two of the present invention, and as shown in the figure, transformer body drying system embodiment two of the present invention specifically comprises evaporator 1, oil tank of transformer 2, retracting device 3, filter 4 and vacuum extractor 5.And retracting device 3 comprises condenser 30 and gatherer 31.
The gatherer 31 of retracting device 3 is connected with evaporator 1 by filter 4, and oil tank of transformer 2 also is connected with evaporator 1 by filter 4.The effect of filter 4 has two, the kerosene that the first forms when oil tank of transformer 2 is carried out dry the processing filters, in the kerosene Returning evaporimeter 1 after filtering, and the kerosene that forms during with retracting device 4 condensation process filters, and the kerosene after filtering is returned in the described evaporator.
Concrete processing procedure is, at first oil tank of transformer 2 is vacuumized, then the kerosene steam that 1 pair of kerosene heating of evaporator is generated imports 2 li of oil tank of transformer, utilizing the kerosene steam that the transformer body 20 in the oil tank of transformer 2 is carried out heat drying processes, thereby the moisture in the insulating material of transformer body 20 is deviate from, the condenser 30 that kerosene steam after dry the processing is recovered device 3 reclaims, carry out condensation process by condenser 30, after processing, the kerosene steam condensing generates kerosene and water, and kerosene enters in the gatherer 31 of retracting device 3, after by gatherer 31 kerosene being filtered by filter 4, clean recovery kerosene is annotated in the evaporator 1, so just formed a circulation circuit.
In addition, when utilizing the kerosene steam that the transformer body 20 in the oil tank of transformer 2 is carried out the heat drying processing, might be because transformer body 20 temperature be excessively low, so that the kerosene steam is condensed into liquid kerosene after emitting the heat of condensation, after these liquid kerosene are extracted out from oil tank of transformer 2, also filter through filter 4, clean recovery kerosene is annotated in the evaporator 1, so just formed another circulation circuit.
So transformer body drying system embodiment two utilizations of the present invention are subjected to the kerosene steam after the thermal evaporation, in oil tank of transformer, transformer body is carried out heat drying and process, thereby the insulating material of transformer body is dewatered, and the time is short, treatment effeciency is high, and treatment effect is good.And utilized the kerosene after two circulation circuits are processed drying to reclaim.
Fig. 7 is the structural representation of transformer body drying system embodiment three of the present invention, as shown in the figure, transformer body drying system embodiment three of the present invention specifically comprises evaporator 1, oil tank of transformer 2, comprises retracting device 3, filter 4, vacuum extractor 5 and the leakage pump 6 of condenser 30 and gatherer 31.
Fig. 8 is vapour phase dry run curve chart of the present invention, wherein t represent temperature unit be degree centigrade (℃), P represents pressure, unit is handkerchief (Pa), T represents the time, utilizes as shown in the figure transformer body drying system of the present invention that transformer body is carried out the drying processing and mainly comprises Four processes: preparation, heating, step-down and high vacuum.
1, prepares
In evaporator 1, inject enough kerosene, then utilize 6 pairs of evaporators 1 of leakage pump, condenser 30 and gatherer 31 to vacuumize, oil tank of transformer 2 is processed sealing simultaneously, utilizes 5 pairs of oil tank of transformer 2 of vacuum extractor to vacuumize, and the pressure of oil tank of transformer 2 drops to below the 700Pa;
2, heating
With satisfactory kerosene steam input transformer fuel tank 2,, the transformer body 20 in the oil tank of transformer 2 is heated, the temperature of device body 20 is constantly increased, the moisture in the insulating material on the device body 20 constantly evaporates and is pumped;
Kerosene is heated in evaporator 1 and becomes kerosene steam, after oil tank of transformer 2 interior to transformer body 20 heating, is emitted condensation latent heat, generates liquid, by heating evaporation again in filter 4 Returning evaporimeters 1, forms like this one and loops heating.Along with the temperature of oil tank of transformer 2 progressively raises, the saturation pressure of kerosene also constantly raises, the discharge of the moisture of insulating material makes the certain water vapour of oil tank of transformer 2 interior gatherings on the transformer body 20, the gas leakage that the system of adding may exist, these mists constantly raise oil tank of transformer 2 internal pressures, in order not make oil tank of transformer 2 internal pressures too high, in time moisture is taken out of outside the system simultaneously, these mists enter retracting device 3, condenser 30 by retracting device 3 becomes liquid with water vapour with the kerosene steam-condensation with gatherer 31, and gas is discharged outside the system, and the liquid water of condensation is different by proportion with kerosene in the gatherer 31, above kerosene floats over, flow out by overfall, also turn back in the evaporator 1, carry out circulating-heating, also form a circulation, water bleeds off after each treatment cycle is finished.
In the heating period, when the steam temperature of evaporator 1 reach 115 ℃, when the vacuum degree of oil tank of transformer 2 reaches 700pa, opening the steam transfer valve makes kerosene steam enter oil tank of transformer 2, utilize kerosene steam as thermophore, the abundant heating transformer device of its heat of condensation body 20, the power of impregnation of kerosene steam is very strong, and conduction efficiency is high, therefore firing rate is fast, and the kerosene of condensation is returned evaporator 1 by oil tank of transformer 2 bottoms through oil pump and recycled.The mist of the steam of heating evaporation, survival gas and a small amount of kerosene steam is after rebound valve arrives condenser 30 condensations, water and kerosene flow to collecting tank 31, and residual gas is discharged from, oil is different separately in collecting tank 31 internal cause density with water, water is drained after metering, kerosene then overflows from overfall, returns evaporator 1 after filtering through filter 4 through the effect of infusion pump and recycles.
3 step-downs
After reaching certain requirement, evaporator 1 stops to carry kerosene steam to oil tank of transformer 2, oil tank of transformer 2 temperature are kept by the outer heat pipe that connects of oil tank of transformer 2 shells, then utilize leakage pump 6 through gatherer 31, condenser 30 and rebound valve oil tank of transformer 2 to be taken out steam, to become steam and take away being retained in kerosene on the transformer body 20, to improve the vacuum degree in the oil tank of transformer 2, make the pressure of oil tank of transformer 2 drop to 2500Pa;
After heating makes transformer body 20 be raised to certain temperature and most of moisture already to have discharged, the kerosene in the insulation insulating material on the transformer body 20 is evaporated again.
4, high vacuum
Insulating material temperature recovery on the transformer body 20 can reach 125 ℃ at last, further improves the vacuum degree of oil tank of transformer 2, and moisture and kerosene in the insulating material on the transformer body 20 are further evaporated, through technological parameter to regulation.This moment, vapour-phase system quit work, close all valves of transformer body 20, open main vacuum valve, restart vacuum extractor 5, oil tank of transformer 2 is vacuumized, final pressure will reach below the 50Pa, because 95% moisture is removed before high vacuum, so should not need for a long time in the stage.At this moment a treatment cycle finishes.
Fig. 9 is the structural representation of transformer body drying system embodiment four of the present invention, as shown in the figure, transformer body drying system embodiment three of the present invention specifically comprises evaporator 1, oil tank of transformer 2, comprises retracting device 3, filter 4, vacuum extractor 5, leakage pump 6, distiller 7, measuring appliance 8 and the door gear 9 of condenser 30 and gatherer 31.
Kerosene in the evaporator 1 is that oil storage tank 10 passes through back to end valve usefulness oil pump to evaporator 1 injection.When evaporator 1 occurs to leak, can be by urgent draining valve to oil storage tank 10 oil extractions.Distiller 7 is used for the kerosene that decontamination cycle is used, and for example removes transformer oil wherein.Measuring appliance 8 oil tank of transformer are 2 connections mutually, are used for the total pressure of measuring transformer fuel tank 2 mists, and its measured value can be used as the critical data of judging dry termination.
Transformer body drying system of the present invention is to withering with the transformer body of transformer oil the time, transformer oil will inevitably be sneaked in the middle of the dry kerosene of processing, increase along with transformer oil content in the kerosene, make the saturated steam drops of kerosene, so that make kerosene quantity of steam in the vacuum tank very little and can't keep normal heating, just need to carry out purified treatment to kerosene.
Because kerosene and transformer oil all are organic substances, can not resemble and separate by the method for precipitation water and the kerosene, therefore must take the method for fractionation to separate.If in heating process, find the transformer oil too high levels in the kerosene, then need temporary transient stopped heating, carry out the centre distillation.
Concrete still-process is as follows, and the mixed liquor in the evaporator is carried out circulating-heating, and kerosene becomes kerosene steam through evaporator, enters gatherer by condenser condenses, and remaining liquid major part is transformer oil in the last evaporator.The condition that distillation finishes is to measure mixeding liquid temperature to reach about 135 ℃, and pressure reaches about 2.8kPa.Need through several times distillation the final parameter of determining that distillation finishes.
Existing oil tank of transformer is the shell of oil-filled transformer, and transformer body just is placed in the oil tank of transformer of having filled transformer oil.Transformer oil has two kinds of effects, on the one hand as dielectric; As the medium of heat radiation, namely by the circulation of transformer oil, with the heat that comes out in winding and the iron core, bring tank wall or radiator, cooler cools off on the other hand.Fuel tank all becomes with Plate Welding, and its structural requirement has certain mechanical strength, except should satisfying the ask for something of transformer when moving, also should satisfy the ask for something of transformer when maintenance and transportation.
Large-scale power transformer case shell is all made the box shell-type, when the device body will overhaul, hangs out lighter case shell.There is the case that can make bolted this case shell its underpart along flange, remove case along around fastening bolt, hang out the case shell of outside bell shape, i.e. first oil tank, the device body just all is exposed to air and has suffered.Because the weight of this kind case shell is light than the device body, thus do not need heavy especially hoisting equipment during the box shell, as long as at the scene that transformer is installed, prepare some light-duty lifting tools and get final product work.
Because drying process device of the present invention does not need vacuum tank to come transformer body is carried out the drying processing to the drying of transformer body, but uses oil tank of transformer itself, so oil tank of transformer is had certain requirement, require as follows:
1) oil tank of transformer can bear vacuum and the fluorubber gasket is replaced by in 150 ℃ of temperature, all sealings place of oil tank of transformer, the transformer oil box outer wall adopts the high-temp thermoelectric band heating;
2) oil tank of transformer should have manhole, in order to install the transformer body temperature measurement probe, guarantees to measure the available point correct position;
3) the safety dumping valve of oil tank of transformer bottom is in the casing lowest part as far as possible, can make the relative drain valve of transformer that certain angle of inclination be arranged according to actual conditions, is convenient to the transformer oil in the oil tank of transformer and the discharge of solvent liquid in the course of work;
4) parameter that oil tank of transformer must satisfy before the equipment operation:
Oil tank of transformer test limits vacuum degree (total head) :≤133Pa (unloaded, cold conditions)
Leak rate Pa l/s (cold conditions) :≤800PaL/s
Device body and fuel tank upper-part bearing temperature: 135 ℃
In addition, need to the processing of oil tank of transformer be had:
1) pneumatic ball valve and 4 air cleaners (filtering accuracy 20 μ m) of releasing oil tank of transformer vacuum.
2) overpressure safety protection device is set.
3) high temperature definite value anti-explosion electric torrid zone GHR-PF-380V-75W is adopted in the heating of transformer oil box outer wall.
4) oil tank wall temperature survey: 4 points
5) product temperature is measured: 4 points
6) vent valves of oil tank of transformer bottom links to each other with coarse filter.Returning liquid adopts extraordinary high vacuum forced-ventilated gear pump to flow back to evaporator.
7) radiator of dismounting transformer, oil conservator, pressure relief valve, quick oil pressure relay, Buchholz relay, thermometer etc.
Drying system of the present invention has solved following problem:
1, high-power transformer manufactures the problem that rear transportation exists, because transformer capacity is increasing, volume and weight is also increasing.Haulage time is long, and freight even cross hundred million, so some transformer is forced installs at the scene, but field drying technique and manufactory's drying process fall far short at present, can not guarantee the best situation of transformer;
2, field for Large Transformer maintenance, especially accident maintenance, when needing open-assembly time long, general drying processing is difficult to transformer is returned to original state, and general the employing returned the method that repair in shop is managed now, but returning factory requires a great deal of time.For some oversize transformer, owing to condition restriction, can't return the repair in shop reason at all.
3, because the dry used time of drying system of the present invention is short, therefore can reduce the transformer field repair time.
4, after operating Insulation Resistance of Transformer reduced, drying system of the present invention can carry out finish-drying and cleaning, and the insulation property of transformer are significantly improved, and returns to the insulation level when dispatching from the factory.
Figure 10 is the flow chart of transformer body drying means of the present invention, and as shown in the figure, transformer body drying means of the present invention specifically comprises the steps:
Step 101 vacuumizes the oil tank of transformer that is equipped with transformer body;
Needed oil tank of transformer is carried out encapsulation process before vacuumizing, the vacuum degree of oil tank of transformer will be below 700Pa; Can also vacuumize evaporator and retracting device in addition;
After the kerosene steam-condensation is processed into kerosene, also to carry out filtration treatment, in the kerosene Returning evaporimeter after the filtration treatment, this is the cyclic process of a kerosene steam; Also have in addition the cyclic process of a kerosene liquid, the kerosene that forms when processing transformer body is dry exactly filters, with the kerosene Returning evaporimeter after filtering.
Again as shown in figure 10, further comprising the steps of:
Step 104 to in the kerosene steam suction retracting device in the oil tank of transformer, is carried out condensation process and is become kerosene and water, with the kerosene Returning evaporimeter;
After reaching certain requirement, evaporator stops to carry kerosene steam to oil tank of transformer, and oil tank of transformer is taken out steam, will become steam and take away being retained in transformer kerosene with it, to improve the vacuum degree in the oil tank of transformer 2, make the pressure of oil tank of transformer 2 drop to 2500Pa;
Step 105 vacuumizes oil tank of transformer again.
Transformer insulating material temperature recovery with it can reach 125 ℃ at last, further improves the vacuum degree of oil tank of transformer, and moisture and kerosene in the transformer insulating material are with it further evaporated, through technological parameter to regulation.Final pressure will reach below the 50Pa, is high vacuum, because 95% moisture is removed before this step, this step does not need for a long time.
And, transformer body drying system of the present invention is to withering with the transformer body of transformer oil the time, transformer oil will inevitably be sneaked in the middle of the dry kerosene of processing, increase along with transformer oil content in the kerosene, make the saturated steam drops of kerosene, so that make kerosene quantity of steam in the vacuum tank very little and can't keep normal heating, just need to carry out purified treatment to kerosene, liquid in the evaporator is heated generation kerosene steam, and kerosene steam generates kerosene by recovery system and reclaims.
Because kerosene and transformer oil all are organic substances, can not resemble and separate by the method for precipitation water and the kerosene, therefore must take the method for fractionation to separate.If in heating process, find the transformer oil too high levels in the kerosene, then need temporary transient stopped heating, carry out the centre distillation.
Concrete still-process is as follows, and the mixed liquor in the evaporator is carried out circulating-heating, and kerosene becomes kerosene steam through evaporator, enters gatherer by condenser condenses, and remaining liquid major part is transformer oil in the last evaporator.The condition that distillation finishes is to measure mixeding liquid temperature to reach about 135 ℃, and pressure reaches about 2.8kPa.Need through several times distillation the final parameter of determining that distillation finishes.
So drying means of the present invention utilizes kerosene steam that the transformer body in the transformer is carried out drying, drying time is short, and drying efficiency is high, and drying effect is good.
Think at present the difficult quality guarantee that field drying is processed, larger with the poor distance of technological level in the manufactory, be mainly reflected on clean level and the insulation level index, the main cause that causes this phenomenon is because on-the-spot dry technology does not reach requirement.
The shortcoming that the heating-up temperature that drying means of the present invention had both overcome the traditional drying method is low, inhomogeneous, the processing time is long when also having overcome the oil spout drying, reduces the shortcoming of the moisture diffusion coefficient in the insulating material greatly owing to spray transformer oil.Both absorbed simultaneously the advantage that the traditional drying method does not reduce insulation internal moisture diffusion coefficient, absorbed again that oil spout seasoning heating-up temperature is high, the advantage of homogeneous heating.Therefore, drying means rate of drying of the present invention is fast, dry mass good.
If adopt at the scene drying means of the present invention, can realize transformer field maintenance " batch production ", bring following advantage:
1) site examining and repairing and dry mass can reach the power transformer product quality in the factory, greatly improve repair quality; The insulation of transformer just can return to situation when dispatching from the factory, and transformer operation level and life-span will significantly improve;
2) can not be subjected to the restriction of transformer body air exposure time, also can construct night, and the interruption maintenance time shortens greatly, greatly improved overhaul efficiency;
3) change site examining and repairing into by returning factory's maintenance, the Repair of Transformer quality is greatly improved;
4) save a large amount of freight charges, process because maintenance is dry at the scene, greatly reduce drying cost.
Above-described embodiment; purpose of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the above only is the specific embodiment of the present invention; the protection range that is not intended to limit the present invention; within the spirit and principles in the present invention all, any modification of making, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (11)
1. a transformer body drying system is characterized in that, described system comprises:
Oil tank of transformer is used for accommodating transformer body and transformer oil;
Vacuum extractor is connected with described oil tank of transformer, is used for vacuumizing behind the emptying described transformer oil of described oil tank of transformer, so that described oil tank of transformer forms vacuum chamber;
Evaporator is connected with described oil tank of transformer, imports described oil tank of transformer for the kerosene steam that kerosene is added thermosetting, described transformer body is carried out drying process;
Retracting device, be connected with described evaporator with described oil tank of transformer, the kerosene steam-condensation to described transformer body is dry after processing that is used for reclaiming in the described oil tank of transformer is processed into kerosene and water, and kerosene is returned described evaporator, wherein, described retracting device specifically comprises:
Condenser is connected with described evaporator with described oil tank of transformer, is used for forming kerosene and water in the described oil tank of transformer kerosene steam-condensation after the dry processing of described transformer body being processed;
Gatherer is connected with described evaporator with described condenser, is used for the kerosene that described condenser forms is returned described evaporator;
Leakage pump, be connected with described gatherer, be used for described gatherer and condenser are vacuumized, or by described gatherer and condenser described evaporator vacuumized, and with the described condenser of kerosene steam suction after the processing of the drying in the described oil tank of transformer.
2. transformer body drying system according to claim 1 is characterized in that, described system also comprises:
Filter, be connected with described oil tank of transformer, retracting device and evaporator, the kerosene that forms when being used for that described oil tank of transformer carried out dry the processing, and the kerosene that forms during described retracting device condensation process filters, and the kerosene after filtering is returned described evaporator.
3. transformer body drying system according to claim 1 is characterized in that, described system also comprises:
Distiller is connected with described evaporator, is used for the kerosene that decontamination cycle is used.
4. transformer body drying system according to claim 1 is characterized in that, described system also comprises:
Measuring appliance is connected with described oil tank of transformer, is used for measuring the total pressure of described oil tank of transformer mist.
5. transformer body drying system according to claim 1 is characterized in that, described system also comprises:
Door gear is connected with described oil tank of transformer.
6. a transformer body drying means is characterized in that, described method comprises:
The oil tank of transformer that is equipped with transformer body is vacuumized;
The kerosene steam that kerosene in the evaporator is added thermosetting imports oil tank of transformer, processes described transformer body is dry;
In the described retracting device of kerosene steam suction after the drying that retracting device will reclaim in the described oil tank of transformer is processed, carry out condensation process and become kerosene and water, kerosene is returned described evaporator;
Again described oil tank of transformer is vacuumized.
7. transformer body drying means according to claim 6 is characterized in that, the described oil tank of transformer that is equipped with transformer body is vacuumized also comprises before, to described oil tank of transformer encapsulation process.
8. transformer body drying means according to claim 6, it is characterized in that, described to also comprising after the dry processing of described transformer body, the kerosene that forms when processing described transformer body is dry filters, and the kerosene after filtering is returned described evaporator.
9. transformer body drying means according to claim 6 is characterized in that, describedly comprises that also the kerosene that forms during to described condensation process filters before kerosene is returned described evaporator.
10. transformer body drying means according to claim 6 is characterized in that, describedly also comprises when the oil tank of transformer that is equipped with transformer body is vacuumized, and described evaporator and retracting device are vacuumized.
11. transformer body drying means according to claim 6 is characterized in that, described method also comprises,
Liquid in the described evaporator is heated generation kerosene steam, and described kerosene steam generates kerosene by described retracting device and reclaims.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010120986 CN102194564B (en) | 2010-03-09 | 2010-03-09 | System and method for drying transformer body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010120986 CN102194564B (en) | 2010-03-09 | 2010-03-09 | System and method for drying transformer body |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102194564A CN102194564A (en) | 2011-09-21 |
| CN102194564B true CN102194564B (en) | 2013-04-24 |
Family
ID=44602464
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201010120986 Active CN102194564B (en) | 2010-03-09 | 2010-03-09 | System and method for drying transformer body |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102194564B (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102054577B (en) * | 2009-10-30 | 2014-04-30 | 特变电工衡阳变压器有限公司 | System and method for realizing kerosene vapor-phase drying to on-site assembly transformer |
| CN102568764A (en) * | 2012-02-01 | 2012-07-11 | 宁波奥克斯高科技有限公司 | Oil injection method for oil immersion type transformers |
| CN103357198A (en) * | 2012-04-06 | 2013-10-23 | 天津市艾佰恩机电设备有限公司 | Passive vacuum oil purifying system |
| CN103245169B (en) * | 2013-05-16 | 2014-12-10 | 孙茂发 | Low-positive-pressure heating and vacuum drying treatment process for oil immersed current transformers |
| CN104048481B (en) * | 2014-06-16 | 2016-04-27 | 广东电网公司电力科学研究院 | The vacuum drying method of electrical equipment |
| CN106710809A (en) * | 2015-08-12 | 2017-05-24 | 特变电工沈阳变压器集团有限公司 | Vapor-phase drying system and processing method of on-site +/-800KV converter transformer in power station |
| 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 |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1262326C (en) * | 2002-02-28 | 2006-07-05 | 威廉·海德里希真空设备两合公司 | Preparing device for transformer |
| DE10210396C1 (en) * | 2002-03-08 | 2003-07-10 | Reinhausen Maschf Scheubeck | Oil filter unit for power transformer stepping switch with regulation of feed pump motor for maintaining required volumetric flow rate through filter unit |
| JP2005183857A (en) * | 2003-12-24 | 2005-07-07 | Aichi Electric Co Ltd | Transformer drying method |
| CN101441926A (en) * | 2008-08-28 | 2009-05-27 | 铁道部运输局 | Technique and apparatus for processing transformer silicon oil |
-
2010
- 2010-03-09 CN CN 201010120986 patent/CN102194564B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN102194564A (en) | 2011-09-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102194564B (en) | System and method for drying transformer body | |
| CN103474206B (en) | Nuclear power station transformer oil treatment process | |
| CN104332284A (en) | Hot oil spray and drying device and method for converter transformer | |
| CN104103409B (en) | The field drying processing method of converter power transformer | |
| CN108321712A (en) | A kind of transportable transformer device body drying device | |
| CN201357467Y (en) | Microwave -vacuum drying carbonizing device for wood | |
| US10870069B2 (en) | Superheated water extraction with counterpressure system and method thereof | |
| CN106606889A (en) | Molecular sieve dehydration process and molecular sieve dehydration apparatus | |
| CN104332257B (en) | A kind of vacuum microwave drying method of high temperature resistant communication cable insulating technique and dried recovered recycling processing means thereof | |
| CN104788003A (en) | Oily sludge vacuum drying method | |
| RU2393208C1 (en) | Installation for processing green abies | |
| RU2399109C1 (en) | Method for manufacturing of electrical articles and installation for its realisation | |
| CN102054577B (en) | System and method for realizing kerosene vapor-phase drying to on-site assembly transformer | |
| CN201868166U (en) | Vacuum insulation oil immersion device | |
| CN103289808A (en) | Multi-field joint lubricating oil dehydration and purification device | |
| CN103807846B (en) | The method of vacuum exhaust heater and heat recovery recycling | |
| CN102826729B (en) | Electromagnetic microwave treatment system and method for oil-based drilling fluid waste | |
| CN208369044U (en) | A kind of transportable transformer body drying device | |
| RU2624088C1 (en) | Method of drying plant-based material and device for its implementation | |
| CN108766733A (en) | A kind of disintegrating transportation formula extra-high-voltage alternating current transformer field drying means | |
| EA030334B1 (en) | System and method for realizing kerosene gas phase drying to transformers assembled on-site | |
| RU2648803C1 (en) | Method of cooling and condensation of steam gas mixture and mixture condensation system for its implementation | |
| US1934301A (en) | Method of recovering volatile substances | |
| CN203125644U (en) | Gradient heat treatment device of microwave pretreatment material | |
| CN116705466A (en) | Method for replacing mixed insulating oil of old mineral oil 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 |