CN102054577B - System and method for realizing kerosene vapor-phase drying to on-site assembly transformer - Google Patents
System and method for realizing kerosene vapor-phase drying to on-site assembly transformer Download PDFInfo
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- CN102054577B CN102054577B CN201010265406.4A CN201010265406A CN102054577B CN 102054577 B CN102054577 B CN 102054577B CN 201010265406 A CN201010265406 A CN 201010265406A CN 102054577 B CN102054577 B CN 102054577B
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Abstract
The invention relates to a system and a method for realizing kerosene vapor-phase drying to an on-site assembly transformer, in particular to a system and a method adopted for vapor-phase drying treatment in assembling and overhauling a transformer on site. The system uses a transformer oil tank for containing the transformer as a working capacity for the vapor-phase drying treatment, and the transformer oil tank is connected with vapor-phase drying equipment arranged outside the transformer oil tank by utilizing a connecting pipeline. For facilitating transportation and suiting the limitation and variance of the transformer mounting site, the invention assembles the vapor-phase drying equipment into a modulated mode. Accordingly, the system and the method of the invention can be adopted to achieve the aims of carrying out the vapor-phase drying treatment to the transformer on the transformer mounting site. Meanwhile, compared with a solid kerosene vapor-phase drying system, the invention has simpler system construction and decreases the manufacture and mounting costs of the vapor-phase drying treatment system of the transformer while thoroughly drying the transformer.
Description
Technical field
The present invention relates to transformer production and manufacture field, more specifically, the present invention relates to a kind of kerosene oil-gas phase drying method that utilizes in transformer erecting bed transformer body is carried out to the dry system and method for processing of gas phase.
Background technology
In recent years, along with China's electric power industry development is swift and violent, particularly greatly developing of water power (clean energy resource), and China needs the industry of electric power development to be mostly distributed in southwest, the remote regions in northwestern China (accounting for more than 80%), for very inconvenience of large-scale workpiece transportation.Like this, owing to being subject to the multifactorial restrictions such as shipping height, bridge bearing, a heavy high-power transformer of hundreds of ton can not entirety be transported to erecting bed, thereby adopts the mode that transformer is transported and re-assemblied after reaching the spot with the form of disintegrating.But, because the transformer after disintegrating exists transportation and the long situation of assembled in situ process time, cause the insulating part on transformer to make moist.Therefore, how transformer is carried out to field drying processing and just become the key technology that must solve.
At present, the following several traditional drying methods of the general employing of field drying transformer, as: hot blast vacuumize, spray vacuumize, current flow heats dry (comprising fuel tank eddy heating for heating method, zero-sequence current heating, short circuit current heating) etc.But above-mentioned drying means all exists that heating-up temperature is low, heating time is long, heats inhomogeneous, the dry shortcoming such as not thorough.
But, for the transformer of large capacity, voltage levels, best drying means is to adopt gas phase seasoning, the method is because using kerosene steam as heat medium, and white drying process is almost to carry out under the situation of an anaerobic, so it is high to have heating-up temperature, rate of drying is fast, drying time is short, homogeneous heating, dry thoroughly, can clean the advantages such as foreign material on transformer.
Gas phase drying system is one generally, except arranging fixing vacuum tank and huge cooling system, also will be provided with sufficient water source and thermal source compared with large and complicated system, and a large amount of civil engineering work.At present transformer production producer, all makes gas phase drying system fixedly, is built on fixing basis, for processing transformer at transformer manufactory inner drying.Conventionally, in fixed gas phase drying system, fixation type vacuum tank is body of work volume.During dry processing, the thing that is dried is placed in vacuum tank, and vacuum tank is completed heating, the technical process such as vacuumizes.In this system, such as evaporator of other part etc. also arranges round vacuum tank.In order to guarantee the temperature of vacuum tank, on the outer wall of vacuum tank, be provided with the steam comb for heating and insulation material and the outsourcing armouring for being incubated, and cover (door) has special hydraulic system to make its sealing, for being also provided with in Horizontal type vacuum tank, place the flatcar of transformer body, at vacuum tank, be outside equipped with the draw-gear etc. that makes transformer turnover tank.
Referring now to Fig. 1, the dry course of work of the fixed gas phase of prior art is described.Fig. 1 shows the schematic diagram of the schematic diagram of the fixed gas phase drying system of prior art, and in figure, single arrow is kerosene steam trend, and double-head arrow is steam backhaul, and three arrows are kerosene backhaul; In the drawings, 1-vacuum plant, 2-cooling water system, 3-vacuum tank door gear, 4-vacuum tank, 5-condenser, 6-waste water receiving system, 7-evaporator, 8-sump tank, 9-oil storage tank, 10-water vapour supply system.
The dry course of work of processing of fixed gas phase adopts following steps:
The first step: after transformer body is lifted on flatcar, flatcar is drawn in vacuum tank with draw-gear.
Second step: insert temperature sensor on product, then close vacuum tank door, and vacuum tank door is compressed with tank door hold down gag.
The 3rd step: start the dry running of vapour phase.Gas phase dry run is divided into double teacher:
Preparatory stage, first utilize vacuum plant 1 to reduce the pressure in vacuum tank 4, and the water vapour that evaporator 7 starts to supply by water vapour supply system 10 heat up to kerosene.
Heating period, the water vapour that evaporator 7 continues to supply by water vapour supply system 10 heats up to kerosene, make kerosene liquid become kerosene steam, kerosene steam is transported in vacuum tank 4 by pipeline, thereby heating is placed on the transformer body in vacuum tank, along with the increase of heating time, transformer body is heated gradually, moisture start vaporizer in its insulating material, make to form by kerosene steam in vacuum tank, a kind of mist that the air that water vapour and vacuum tank leak forms, this mist is transported to condenser 5 through return conduits, in condenser 5, water vapour and kerosene steam are condensed under the effect of cooling water system 2, and leakage air is discharged into atmosphere by vacuum pump (not shown), simultaneously through condensed water and kerosene mixture because of proportion different, in condenser, separated, then, the kerosene of separating is evacuated to circulation in evaporator 7 by oil pump (not shown) and re-uses, the moisture of separating is discharged in waste water receiving system 6.
Buck stage, when the moisture major part of the insulating material of transformer is got rid of, start to stop heating to kerosene and the conveying of kerosene steam, utilize vacuum plant 1 that the mist in vacuum tank 4 is discharged simultaneously, the kerosene that makes to remain in insulating material evaporates again.
High vacuum stage of Fig, finally further utilizes vacuum plant 1 to vacuumize vacuum tank 4, and the kerosene and the water that remain in insulating material mid-deep strata are further evaporated, until dry, finishes.
Remove vacuum stages, i.e. aeration step, reaches after dry termination condition, thereby be filled with air, removes the vacuum in vacuum tank, finally makes product go out tank.
From above fixed gas phase dry system setting and the course of work, the dry treatment system cost of manufacture of described gas phase is quite high, do not calculate very much economically, and described system is subject to environmental limit very high, must adopt fixation type vacuum tank and there is sufficient water source and thermal source, could realize the dry processing of transformer gas phase.
Summary of the invention
Therefore, in order to solve, how on-the-spot realization of transformer assembling, transformer to be carried out to the dry problem of processing of gas phase, with to solve formation complexity, cost that the dry treatment system of fixed gas phase has high and be subject to the problem of environmental limitations, the object of this invention is to provide a kind of Assembling transformer and realize the system and method that kerosene oil-gas is dried mutually, it can not be subject to environmental limit just can to transformer, carry out the dry processing of gas phase in transformer erecting bed, thereby can overcome above-mentioned shortcoming and defect of the prior art.
In order to realize foregoing invention object, the present invention adopts and substitutes the vacuum tank in fixed gas phase drying system with the oil tank of transformer of accommodating transformer, and gas phase equipment for drying is made to modular, and then after transformer is transported to, the each part of system is carried out to assembly and connection, thereby realize in transformer erecting bed, transformer is carried out to the dry processing of gas phase.
The invention provides and a kind of Assembling transformer is realized to the system that kerosene oil-gas is dried mutually, this system is the dry swept volume of processing using the oil tank of transformer of accommodating transformer as gas phase, and oil tank of transformer utilizes the connecting tube gas phase drying equipment outside with being arranged on it to be connected.
Gas phase drying equipment of the present invention is assembled into modular.Described gas phase drying equipment can be made into a gas phase drying equipment assembly module.
Further, gas phase drying equipment of the present invention is made multiple modules.Described multiple module comprises that vacuum condensation module, kerosene steam heated module, kerosene return to module, refrigerating module, oil storage tank and sump tank.They are freely placed according to the landform of processing site in the mode of module combination, and are provided with connecting tube between them.Adopt multiple module of the present invention, can simplify the formation of the dry treatment system of gas phase, and be easy to rapidly the each several part of system be assembled, thereby realize at transformer field, carry out the dry object of processing of transformer gas phase.
Preferably, vacuum condensation module, kerosene steam heated module, kerosene returns to module and refrigerating module all adopts container structure.Because the external packing of multiple modules of the present invention adopts container structure, so that the installment work of system becomes simply, easy operating.
Further, vacuum condensation module mainly comprises vacuum unit, condenser and collecting tank etc.;
Kerosene steam heated module mainly comprises evaporator and hotline heater etc.;
Kerosene returns to module and mainly comprises coarse filter etc.;
Refrigerating module mainly comprises water tank and handpiece Water Chilling Units, and is provided with connecting tube between the parts in described each module.The present invention has adopted a simple and easy cooling water system, by large and small handpiece Water Chilling Units and a water tank, formed, can be respectively to the supply of equipment cooling water in vacuum condensation module, kerosene steam heated module, solve the problem of transformer erecting bed lack of water, omitted fixed air dry huger cooling water system mutually.
Preferably, the evaporator that the present invention adopts is external single evaporator, and for realizing kerosene evaporation and distillation, and hotline heater utilization electricity heats conduction oil, and then heat-conducting oil heating kerosene, thereby makes liquid kerosene become kerosene steam.By adopting heat-conducting oil heating kerosene, make system of the present invention not be subject to the restriction of installation environment, that is, system of the present invention does not need, with the dry processing mode of traditional fixed gas phase, sufficient thermal source is equally set, and just can realize the dry processing of gas phase.
Further, the connecting tube of system of the present invention adopts telescopic pipeline, for compensation, connects.Thereby, can be according to the landform of erecting bed flexible connecting length arbitrarily.
Preferably, in connecting tube, except the connecting tube that connects refrigerating module adopts the plastic flexible pipe with steel wire, remaining connecting tube all adopts telescopic stainless steel flexible hose.
Further, oil tank of transformer is provided with attemperator, and it is for being incubated oil tank of transformer.Preferably, the attemperator of oil tank of transformer of the present invention is arranged on the heat-insulation layer of transformer outside, and is arranged on the assisted heating device of oil tank of transformer bottom.
Further, below oil tank of transformer bottom, be also provided with the base that upper surface is inclined surface, described inclined surface tilts along the length direction of oil tank of transformer, and the oil tank of transformer being placed on it is inclined to set.Owing to having adopted the base tilting, the oil tank of transformer on it is inclined to set, thereby the oil being conducive in oil tank of transformer flow out oil tank of transformer swimmingly.
Oil tank of transformer of the present invention is also provided with gas circuit mouth and the oil circuit mouth for being connected with outside gas phase drying equipment.
Further, gas circuit mouth comprises kerosene vapour inlet and vacuum port, and described kerosene vapour inlet is arranged on the place, middle and lower part of oil tank of transformer side, and described vacuum port is arranged on the top of oil tank of transformer.
Further, in kerosene vapour inlet, be provided with guide pipe, and be provided with supporting baffle on guide pipe, for the kerosene steam flowing in guide pipe is shunted, thereby avoid kerosene vapour inlet place transformer body minor insulation to occur superheating phenomenon.
Further, dry air entrance is installed on the vacuum pipe being connected with vacuum port, wherein, at dry air entrance, is connected with dry air generator.
Oil circuit mouth of the present invention comprises that kerosene the first outlet and kerosene second export.Wherein, kerosene the first outlet is arranged on apart from oil tank of transformer bottom to be had on the sidewall at certain altitude place, as the main oil-out of oil tank of transformer in the dry processing procedure of gas phase, kerosene the second outlet is arranged on the bottom of oil tank of transformer, for the oil of oil tank of transformer is all drained.The kerosene that is externally connected to that kerosene the first outlet and kerosene second export returns to module.
System of the present invention is also provided with temperature control equipment, wherein on described oil tank of transformer, is provided with temperature sensor.Described temperature control equipment is connected with the electric part of system.
For inventive concept of the present invention, the present invention also provides a kind of Assembling transformer is realized to the method that kerosene oil-gas is dried mutually, described method is that the transformer of processing to be dried is placed in oil tank of transformer, utilize connecting tube that oil tank of transformer is connected with the gas phase drying equipment that is arranged on oil tank of transformer outside, and adopt kerosene oil-gas phase drying method to the withering method of the transformer in oil tank of transformer.Therefore, owing to adopting method of the present invention, oil tank of transformer can be substituted to the dry vacuum tank of processing of fixed gas phase, thereby reduce equipment cost, realize in transformer erecting bed transformer is carried out to the dry object of processing of gas phase.
In the present invention, described kerosene oil-gas is dried mutually to process and comprises preparation process, heating steps, depressurization step, high vacuum step and remove vacuum step; Wherein, removing in vacuum step, utilize the dry air of dry air generator generation to remove vacuum to oil tank of transformer.Thereby, guarantee that transformer is thoroughly dried, and avoid transformer secondary to make moist.
In order to guarantee treated transformer finish-drying, the present invention also comprises the method for the final water content of comprehensive judgement transformer, and the determination methods adopting comprises following aspect:
1) transformer total drying time;
2) transformer dry finishes mean temperature;
3) the final vacuum degree of transformer dry;
4) transformer dry product final outflow water rate; With
5) transformer dry insulation test block moisture measurement.
Should be understood that, for invention, general introduction above or detailed description is below all example and illustrative, is intended to the advocated explanation that the invention provides, but not protection scope of the present invention is limited.
Accompanying drawing explanation
Accompanying drawing provides further to be understood the present invention, is incorporated to and forms the application's a part.Specific embodiments of the invention together with specification in order to illustrate formation feature of the present invention.In the accompanying drawings:
Fig. 1 shows the fixed kerosene oil-gas of the prior art schematic diagram of the schematic diagram of dry treatment system mutually.
Fig. 2 shows the schematic diagram that transformer is carried out to the schematic diagram of the dry system of processing of on-the-spot gas phase of the present invention.
Fig. 3 shows the kerosene oil-gas of the present invention dry process chart of processing transformer mutually.
Embodiment
Below in conjunction with accompanying drawing, content of the present invention is described in further detail.
In order to solve, how on-the-spot realization of transformer assembling, transformer to be carried out to dry problem, with to solve formation complexity, cost that the dry treatment system of fixed gas phase has high and be subject to the problem of environmental limitations, the invention provides a kind of Assembling transformer and realize the system and method that kerosene oil-gas is dried mutually, it can not be subject to environmental limit just can to transformer, carry out the dry processing of gas phase in transformer erecting bed.
In order to realize object of the present invention, the present invention adopts and substitutes the vacuum tank in fixed gas phase drying system with the oil tank of transformer of accommodating transformer, and gas phase equipment for drying is made to modular, and then after transformer is transported to, the each part of system is carried out to assembly and connection, thereby realize in transformer erecting bed, transformer is carried out to the dry processing of gas phase.
In order to embody better inventive concept of the present invention and feature of the present invention, now the specific embodiment of the present invention is described in detail.
Fig. 2 shows the schematic diagram that transformer is carried out to the schematic diagram of the dry system of processing of on-the-spot gas phase of the present invention, in figure, single arrow is kerosene steam trend, double-head arrow is steam backhaul, and three arrows are kerosene backhaul, and multiple dashed rectangle is expressed as multiple modules of gas phase drying equipment.In Fig. 2,11-oil tank of transformer 12-vacuum port, 13-dry air entrance, 14-kerosene vapour inlet, 15-kerosene first exports, 16-kerosene steam heated module, 17-vacuum condensation module, 18-refrigerating module, 19-kerosene returns to module, 20-kerosene second exports, 21-assisted heating device, 22-temperature sensor, 23-base, 24-evaporator, 25-hotline heater, 26-sump tank, 27-oil storage tank, 28-collecting tank, 29-condenser, 30-vacuum unit, 31-water tank, 32-handpiece Water Chilling Units, 33-waste water collection device, 34-coarse filter.
Referring to Fig. 2, the invention provides a kind of system of transformer being carried out to the dry processing of on-the-spot gas phase, it comprises: oil tank of transformer 11, it,, as the dry swept volume of processing, is placed on the transformer body of processing to be dried in oil tank of transformer 11; Gas phase drying equipment, it is arranged on oil tank of transformer 11 outsides; With for the gentle dry connecting tube arranging mutually of connection transformer fuel tank 11.In system of the present invention, using oil tank of transformer 11 as swept volume, replace the vacuum tank in the dry treatment system of traditional fixed gas phase.Owing to oil tank of transformer having been substituted to the vacuum tank of fixed gas phase drying system, saved the capital construction installment work of vacuum tank being installed and carry out, thereby the equipment cost of whole dry treatment system and installation cost are reduced greatly.In actual production, by using oil tank of transformer as the dry swept volume of processing transformer, the formation of whole dry treatment system is simplified, has saved approximately 2,000,000 yuan of the equipment investment cost such as fixation type vacuum tank.
In order to guarantee the temperature of oil tank of transformer, on oil tank of transformer 11, be provided with seal, and when its outside is surrounded by heat-insulation layer, also in the bottom of oil tank of transformer, assisted heating device 21 be housed.Described assisted heating device 21 comprises such as infrared heating plate etc.
Preferably, in order further to guarantee that oil tank of transformer can be dried processing up hill and dale to the transformer in it, can carry out to oil tank of transformer strengthening and the improvement of following aspect: 1) improve the intensity of oil tank of transformer itself, make it that permanent deformation not occur under hot vacuum; 2) reliability of all seals on raising oil tank of transformer, for example high resistance to kerosene, high temperature tolerance; With 3) kerosene guider is set in oil tank of transformer, so that it is unimpeded to enter kerosene vapour-cycling in oil tank of transformer.The improvement of these aspects and setting, be all dried the transformer in it under the condition of high temperature thoroughly in order to realize oil tank of transformer.
In order to make the kerosene circulation of whole system unimpeded, in the bottom of oil tank of transformer, be also lined with the base 23 of a certain altitude.Conventionally, described base is made by the metal material with high compressive strength.In the present embodiment, described base is steel base.The upper surface of described steel base is inclined surface, and described inclined surface tilts along the length direction of transformer, and the oil tank of transformer that makes to be placed on steel base is inclined to set.By adopting this to arrange, can make the oil-out of oil tank of transformer in low position, and then guarantee that the kerosene circulation of whole system is unimpeded.
In the dry treatment system of gas phase of the present invention, for the gas phase drying equipment that is placed on oil tank of transformer 11 outsides, adopt the structure of modular, so that the variation of transportation and adaptation transformer erecting bed landform.According to technical scheme of the present invention, gas phase drying equipment can be made to the modular structure of an assembly, to simplify the dry treatment system of whole gas phase, form and be convenient to system each several part to assemble, and then having shortened the dry cycle of processing of transformer gas phase.
Preferably, the present invention adopts external gas phase drying equipment is divided into multiple modules.Described multiple modules comprise that vacuum condensation module 17, kerosene steam heated module 16, kerosene return to module 19, refrigerating module 18, oil storage tank 27 and sump tank 26, and they are freely placed according to the landform of transformer erecting bed in the mode of module combination.
In the present embodiment, for the ease of transportation and outside work, vacuum condensation module 17, kerosene steam heated module 16, kerosene can be returned to module 19, refrigerating module 18 is made container structure, during use, only need open on container door, greatly saved installation procedure and set-up time.Meanwhile, because gas phase drying equipment has adopted above-mentioned combined module type, make the installation of whole system and operation all become simple and easy and safe and reliable, thereby greatly improved operating efficiency.
In connecting tube in native system, except the connecting tube that connects described refrigerating module adopts the plastic flexible pipe with steel wire, remaining connecting tube all adopts telescopic stainless steel flexible hose.That is to say, except the connecting tube of cooling device, all vacuum pipes and kerosene pipeline adopt stainless steel material entirely, and object is to prevent that iron rust from entering in kerosene and transformer, thereby guarantee transformer quality.Meanwhile, adopt stainless steel pipes not only can make system attractive in appearance, light and handy, and make position between the each module of gas phase drying equipment place more flexible, convenient.
Moreover, because gas phase equipment for drying and the oil tank of transformer distance of native system are very near, so the connecting tube that the connecting tube adopting adopts than fixed gas phase equipment for drying is short a lot, make when having saved pipeline material, also make kerosene steam in course of conveying, reduce energy loss, shortened to the greatest extent the dry processing time of transformer gas phase.
In the present embodiment, vacuum condensation module 17 mainly comprises vacuum unit 30, condenser 29 and collecting tank 28 etc.; Kerosene steam heated module 16 mainly comprises evaporator 24 and hotline heater 25 etc.; Kerosene returns to module 19 and mainly comprises coarse filter 34 etc.; Refrigerating module 18 mainly comprises water tank 31 and handpiece Water Chilling Units 32, and is provided with connecting tube between the parts in described each module.
In order to make native system adapt to the environment of the erecting bed of transformer, the present invention adopts composite type refrigerating module 18, and described refrigerating module 18 is provided with handpiece Water Chilling Units 32 and water tank 31.By this setting, having solved transformer erecting bed does not have the problem at water source, has also guaranteed the cooling effect of system simultaneously.Owing to adopting said structure, make the dry treatment system of gas phase of native system not be subject to the restriction of installation environment, needn't there be sufficient water source and thermal source, just can realize the dry processing of gas phase.
Oil tank of transformer of the present invention is also provided with gas circuit mouth and the oil circuit mouth for being connected with the above-mentioned gas phase drying equipment of outside.Gas circuit mouth comprises kerosene vapour inlet 14 and vacuum port 12, and kerosene vapour inlet 14 is arranged on the place, middle and lower part of oil tank of transformer side, and vacuum port 12 is arranged on the top of oil tank of transformer.
Wherein, in kerosene vapour inlet 14, be provided with guide pipe (not shown), by guide pipe kerosene steam, can reach the middle bottom of oil tank of transformer, preferably, on guide pipe, be provided with supporting baffle (not shown), for the kerosene steam flowing in guide pipe is shunted, thereby solved kerosene vapour inlet place transformer body minor insulation, there is superheating phenomenon.
On the vacuum pipe being connected with vacuum port, be provided with dry air entrance 13, wherein, at dry air intake, 13 places are connected with dry air generator (not shown).
Described dry air generator is for producing dry air reaching after transformer dry termination condition, thereby removes oil tank of transformer vacuum.The arranging of this dry air generator solved and because adopting water content to remove vacuum compared with high normal air, made dried transformer insulated problem of making moist for the second time in processing fixed gas phase is dry, thereby realizes transformer finish-drying.
The oil circuit mouth of oil tank of transformer of the present invention comprise kerosene first export 15 and kerosene second export 20.Kerosene first exports 15 and is arranged on apart from oil tank of transformer bottom and has on the sidewall at certain altitude place, for the main oil-out of oil tank of transformer.Kerosene second exports 20 bottoms that are arranged on oil tank of transformer, for by all discharges up hill and dale of the oil of oil tank of transformer.
Generally, the kerosene first of oil tank of transformer export 15 and kerosene second export on 20, be separately installed with accident oil discharging valve and tank at the bottom of oil discharging valve.Although kerosene second exports, not very large, can utilize kerosene second to export the oil in oil tank of transformer is all discharged clean; And kerosene first outlet arranges greatlyr, but because this outlet and oil tank of transformer distance from bottom have certain height, so the oil in oil tank of transformer 11 can not all flow out from this outlet.In native system, kerosene first is exported to the main oil-out as oil tank of transformer.
At kerosene first outlet and kerosene second, export and be externally connected to kerosene and return to module 19.Described kerosene returns to module and comprises coarse filter 34.
In order to monitor temperature in dry run, native system is also provided with temperature control equipment 22, comprises the temperature sensor 22 being arranged on oil tank of transformer.
Below, in order to embody better feature and the advantage of system of the present invention, in conjunction with the present invention, transformer field is carried out the formation of the dry system of processing of gas phase, will the installment work process of the dry treatment system of transformer field gas phase be described, described installment work process is as follows:
1) check all seals on oil tank of transformer, guarantee its high temperature resistant, resistance to kerosene;
2) prepare kerosene and standby consumable material, as pump oil, screen pack etc.; And to oil storage tank 27 and hotline heater 25, add kerosene and conduction oil by equipment regulation requirement.
3) oil tank of transformer is sling, and put preprepared base at its bottom pad, make oil tank of transformer length direction maintain certain gradient;
4) after transformer body has assembled, at transformer, insert temperature sensor with it, then temperature sensor is connected with system electrical part;
5) in transformer body top and the bottom, place respectively insulation test block, be used for being dried the water content of rear detection insulation test block, for assessment of the drying effect of dry run;
6) between drying equipment, between drying equipment and oil tank of transformer, carry out pipeline and be connected;
7) all electric control gears of open system;
8) oil tank of transformer 11 outsourcing insulation materials are installed, and in oil tank of transformer 11 bottoms, assisted heating device 21 are installed;
9) start vacuum unit 30 oil tank of transformer is vacuumized, and test oil tank of transformer leak rate.
Complete after above-mentioned work, just can utilize system of the present invention to carry out kerosene oil-gas dry processing mutually to the transformer being placed in oil tank of transformer.
For inventive concept of the present invention, the present invention also provides a kind of Assembling transformer is realized to the method that kerosene oil-gas is dried mutually, described method is that the transformer of processing to be dried is placed in oil tank of transformer, utilize connecting tube that oil tank of transformer is connected with the gas phase drying equipment that is arranged on oil tank of transformer outside, and adopt kerosene oil-gas phase drying method to the withering method of the transformer in oil tank of transformer.Therefore, owing to adopting method of the present invention, oil tank of transformer can be substituted to the vacuum tank of fixed gas phase drying system, thereby reduce equipment cost, realize in transformer erecting bed transformer is carried out to the dry object of processing of gas phase.
Dry run and the fixed gas phase dry run of the present invention to transformer is roughly the same, described process is divided into five operating procedures, be respectively: preparation process, heating steps, depressurization step, high vacuum step and releasing vacuum step, below, with reference to the accompanying drawings 3, above-mentioned steps is illustrated as follows.
The first step: preparation process R, utilizes vacuum unit 30 at room temperature oil tank of transformer 11 to be vacuumized;
Second step: heating steps H, make the pressure in oil tank of transformer reach certain value, hotline heater 25 starts to heat to evaporator 24, in evaporator 24, utilizes progressively heating transformer device body of kerosene steam liberated heat.Kerosene steam runs into cold transformer after one's death on the one hand, is condensed into liquid, and discharges from oil tank of transformer bottom, then turns back to evaporator 24, and re-starts heat cycles.On the other hand along with the rising of transformer temperature, kerosene steam can total condensation but is formed and build up in oil tank of transformer, but still exists with the form of gas.Along with the transformer body temperature in oil tank of transformer slowly raises, also just make the temperature climbed of the insulating material of transformer, thereby, moisture in insulating material also starts vaporization, and accumulates in oil tank of transformer with Properties of Steam, adds again and may have a small amount of air to leak in oil tank of transformer, therefore, now the gas in oil tank of transformer is mist, and meanwhile, in oil tank of transformer, pressure is also raising gradually.Next, described mist enters in the condensing unit of constant pressure and carries out condensation.After condensation, the kerosene of liquid is different because of proportion with water, so in collecting tank 28 after sedimentation separation, water is exhausted from system in waste water collection device 33, and kerosene liquid is re-used and again enters evaporator 24 and form second circulation, permanent gases is discharged in atmosphere by vacuum unit 30.Utilize two above-mentioned circulations, transformer body is progressively heated.When being heated to after certain hour, 11 pressure and evaporator 24 internal pressures meeting convergence balances in oil tank of transformer, step-down in the middle of need to carrying out once or several times, depressurization step IPL in the middle of, cut off the kerosene steam channel that leads to oil tank of transformer, described middle step-down is to utilize vacuum condensation module 17 and the pressure of realization reduction oil tank of transformer, helps kerosene steam and enters in oil tank of transformer.If the device of transformer is with it with transformer oil, when the content of transformer oil in mixing material in evaporator exceedes 10% (left and right), the heating of stopper body, carries out still-process, different with transformer oil vaporizing pressure according to kerosene, separate the transformer oil in kerosene.After the purity of kerosene is improved like this, start to continue Kerosene heater body process.
The 3rd step: depressurization step P, when transformer body temperature reaches certain value, the most of moisture in TRANSFORMER INSULATING MATERIAL is got rid of, and starts to stop kerosene and carries in evaporator.Utilize vacuum unit 30 that the mist in oil tank of transformer is discharged, the kerosene that makes to remain in insulating material evaporates again.
The 4th step: high vacuum step V, further utilize vacuum unit 30 to carry out height to oil tank of transformer 11 and vacuumize, the kerosene and the water that remain in insulating material mid-deep strata are further evaporated, until dry, finish.
The 5th step: remove vacuum step, the step of inflating E, reaching after transformer termination condition, first opens dry air generator, by dry air releasing oil tank of transformer vacuum.
Finally open the population (there is no the population of jointing temp transducer) on oil tank of transformer, take out insulation test block, detect the water content of insulating part, overall process finishes.
As mentioned above, compared with processing with fixed gas phase is dry, the dry processing of the dry handling process of gas phase of the present invention and fixed gas phase is roughly the same, but, because change has occurred the interior environment of the dry drying system of processing of transformer gas phase of the present invention, outside drying equipment is improved and adjusted simultaneously, thereby there is very large variation in the each control parameter that makes the present invention process dry run technique.
For the feature of the dry handling process of gas phase of the present invention is described, the main difference point of the dry handling process of gas phase of the present invention and fixed gas phase dry run is now described.Described main difference point is: 1) in the present invention, owing to having adopted oil tank of transformer as swept volume, little much than the volume of fixation type vacuum tank, so require high vacuum time short in processing step, it is high that vacuum degree is wanted;
2) in the present invention, due to the equipment of kerosene steam and oil tank of transformer, that distance is set is very near, so kerosene conveyance conduit is also not as the desired such length of fixation type vacuum tank, so the present invention is having reduced energy loss in kerosene steam course of conveying;
3) in the present invention, reaching after transformer dry termination condition, carry out the releasing vacuum step in technological process of the present invention, inflate the step of E, in this step, first open the dry air generator with heater, with dry air, allow dry air enter in oil tank of transformer, to remove oil tank of transformer vacuum.This operation is with fixed difference: fixed gas phase is dry is to adopt normal air to remove vacuum, but because water content in normal air is higher, so easily make dried transformer insulatedly make moist for the second time.Therefore, the releasing vacuum step in the method that the present invention adopts can avoid dry transformer after treatment again to make moist, thereby has guaranteed the dry mass of transformer.
Simultaneously, in order to judge that whether withering transformer has reached the required quality requirement of dry processing, judges in the following ways: when oil tank of transformer internal pressure approaches atmospheric pressure, open the population on oil tank of transformer, take off insulation test block, detect the water content of insulating part.In the present invention, insulation test block being set is in order to judge better the final water content of transformer.
Except the water content of the test block of insulating by detection judges the water content of transformer, comprehensively judge that the final water content of transformer also needs to judge from the following aspect: transformer total drying time; Transformer dry finishes mean temperature; The final vacuum degree of transformer dry; Transformer dry final outflow water rate is measured.
In sum, adopt system and method for the present invention except reaching above-mentioned goal of the invention, also have advantages of as follows:
1) can shorten production cycle of transformer, compared with traditional field drying method, can shorten at least 1/2 drying time, thereby improved economic benefit;
2) compared with traditional field drying method, heating more evenly, dry more thorough;
3) compared with traditional field drying method, because kerosene steam itself is best cleaning agent, it can wash away the transformer oil in when maintenance, can also remove the aging material that remains in TRANSFORMER INSULATING MATERIAL, impurity etc., thereby has improved the cleanliness factor of transformer;
4) compared with traditional field drying method, because the method for native system is easy to operate, automaticity is higher, so reduced operator's labour intensity.
5) compared with being dried mutually with fixed air, owing to adopting oil tank of transformer as swept volume, do not need to make in addition vacuum tank and civil engineering costs, greatly reduce dry processing cost;
6) compared with being dried mutually with fixed air, equipment is concentrated small and exquisite, convenient operation and monitoring;
7) compared with being dried mutually with fixed air, because being module combined type structure, flexibility is stronger, and adaptability is wider.Not only in intra-company, can be used for being dried and process transformer body, when maintenance transformer and assembling transformer, also can use.
Therefore, system and method provided by the present invention, has solved in the on-the-spot problem of transformer being carried out to the dry processing of gas phase of transformer assembling, in the case of improving the quality of transformer dry processing, simplified the formation of the dry treatment system of gas phase, and the system each several part of making is easy to install and transportation.
Because in the situation that not departing from the scope of the invention, can carry out various modifications and variations, it is illustrative and nonrestrictive therefore in above-mentioned explanation, comprising that all technical characterictics shown in accompanying drawing or content be construed as.
Claims (18)
1. one kind Assembling transformer is realized to the system that kerosene oil-gas is dried mutually, it is characterized in that, this system is the dry swept volume of processing using the oil tank of transformer of accommodating transformer (11) as gas phase, and described oil tank of transformer (11) utilizes the connecting tube gas phase drying equipment outside with being arranged on it to be connected, described gas phase drying equipment is assembled into modular, described gas phase drying equipment is made a gas phase drying equipment assembly module, or described gas phase drying equipment is made multiple modules, described multiple module comprises vacuum condensation module (17), kerosene steam heated module (16), kerosene returns to module (19), refrigerating module (18), oil storage tank (27) and sump tank (26), between described multiple module, by connecting tube, connect.
2. system according to claim 1, it is characterized in that, described vacuum condensation module (17), kerosene steam heated module (16), kerosene return to module (19) and refrigerating module (18) all adopts container structure.
3. system according to claim 1, is characterized in that,
Described vacuum condensation module (17) mainly comprises vacuum unit (30), condenser (29) and collecting tank (28);
Described kerosene steam heated module (16) mainly comprises evaporator (24) and hotline heater (25);
Described kerosene returns to module (19) and mainly comprises coarse filter (34);
Described refrigerating module (18) mainly comprises water tank (31) and handpiece Water Chilling Units (32), and described vacuum condensation module, kerosene steam heated module, kerosene return in module and refrigerating module, between the parts in each module, are provided with connecting tube.
4. according to right, ask the described system described in 3, it is characterized in that, described evaporator (24) is external single evaporator, be used for realizing kerosene evaporation and distillation, and described hotline heater (25) utilizes electricity to heat conduction oil, and then described heat-conducting oil heating kerosene, thereby make liquid kerosene become kerosene steam.
5. system according to claim 3, it is characterized in that, at described vacuum condensation module, kerosene steam heated module, kerosene, return in module and refrigerating module, the described connecting tube in each module adopts telescopic pipeline, for compensation, connects.
6. system according to claim 3, it is characterized in that, connecting tube in described refrigerating module adopts the plastic flexible pipe with steel wire, described vacuum condensation module, kerosene steam heated module, kerosene return in module, and the connecting tube in each module all adopts telescopic stainless steel flexible hose.
7. system according to claim 1, is characterized in that, described oil tank of transformer (11) is also provided with attemperator, and it is for being incubated described oil tank of transformer.
8. system according to claim 7, is characterized in that, described attemperator comprises the heat-insulation layer that is arranged on oil tank of transformer outside, and is arranged on the assisted heating device (21) of described oil tank of transformer bottom.
9. system according to claim 8, it is characterized in that, further, in described oil tank of transformer bottom, be also provided with the base that upper surface is inclined surface (23), described inclined surface tilts along the length direction of oil tank of transformer, and the described oil tank of transformer being placed on it is inclined to set.
10. system according to claim 1, is characterized in that, described oil tank of transformer is also provided with gas circuit mouth and the oil circuit mouth for being connected with the described gas phase drying equipment of outside.
11. systems according to claim 10, it is characterized in that, described gas circuit mouth comprises kerosene vapour inlet (14) and vacuum port (12), described kerosene vapour inlet is arranged on the place, middle and lower part of oil tank of transformer side, and described vacuum port is arranged on the top of oil tank of transformer.
12. systems according to claim 11, it is characterized in that, in described kerosene vapour inlet (14), be provided with guide pipe, and on guide pipe, be provided with supporting baffle, for the kerosene steam flowing in guide pipe is shunted, thereby avoid kerosene vapour inlet (14) to locate to occur superheating phenomenon.
13. systems according to claim 11, is characterized in that, dry air entrance (13) is installed on the vacuum pipe being connected with described vacuum port, and wherein, described dry air entrance (13) is connected with dry air generator.
14. systems according to claim 10, it is characterized in that, described oil circuit mouth comprises that kerosene first exports (15) and kerosene second exports (20), wherein said kerosene first exports (15) and is positioned at apart from oil tank of transformer bottom and has on the sidewall at certain altitude place, described kerosene the first outlet is as the main oil-out of oil tank of transformer in the dry processing procedure of gas phase, described kerosene second exports (20) and is arranged on the bottom of oil tank of transformer, for the oil of oil tank of transformer is all drained.
15. systems according to claim 1, it is characterized in that, further, described system is also provided with temperature control equipment, wherein on described oil tank of transformer, be provided with temperature sensor (22), temperature control equipment is connected with the electric part of system.
16. 1 kinds adopt the system described in claim 1-15 any one to realize to Assembling transformer the method that kerosene oil-gas is dried mutually, it is characterized in that, the transformer of processing to be dried is placed in oil tank of transformer (11), utilize connecting tube that oil tank of transformer (11) is connected with the gas phase drying equipment that is arranged on oil tank of transformer outside, and adopt kerosene oil-gas phase drying method to be dried processing to the transformer in oil tank of transformer.
17. methods according to claim 16, is characterized in that, described kerosene oil-gas phase drying method comprises preparation process, heating steps, depressurization step, high vacuum step and removes vacuum step; Wherein, in described releasing vacuum step, the dry air that utilizes dry air generator to produce is removed vacuum to oil tank of transformer.
18. methods according to claim 16, is characterized in that, in order to guarantee treated transformer finish-drying, also comprise the method for the final water content of comprehensive judgement transformer, and the determination methods adopting comprises following aspect:
1) transformer total drying time;
2) transformer dry finishes mean temperature;
3) the final vacuum degree of transformer dry;
4) transformer dry product final outflow water rate;
5) transformer dry insulation test block moisture measurement.
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| CN201010265406.4A CN102054577B (en) | 2009-10-30 | 2010-08-25 | System and method for realizing kerosene vapor-phase drying to on-site assembly transformer |
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| 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 |
| CN111829299B (en) * | 2020-07-14 | 2023-10-27 | 沈阳诚桥真空设备有限公司 | Solvent spray vapor phase drying method, equipment and system |
| CN113834312B (en) * | 2021-10-11 | 2022-10-04 | 山东泰开互感器有限公司 | Gas phase drying process and device for oil-immersed inverted current transformer |
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| CN1440827A (en) * | 2002-02-28 | 2003-09-10 | 威廉·海德里希真空设备两合公司 | Preparing device for transformer |
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| CN101457154A (en) * | 2008-12-29 | 2009-06-17 | 保定天威集团有限公司 | Waste kerosene regeneration method in transformer kerosene vapor phase drying process |
| CN102194564A (en) * | 2010-03-09 | 2011-09-21 | 华北电力科学研究院有限责任公司 | System and method for drying transformer body |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2002280243A (en) * | 2001-03-21 | 2002-09-27 | Fuji Electric Co Ltd | Method and device for drying electrical apparatus |
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| CN1440827A (en) * | 2002-02-28 | 2003-09-10 | 威廉·海德里希真空设备两合公司 | Preparing device for transformer |
| CN1705144A (en) * | 2004-06-01 | 2005-12-07 | 肇庆市风华锂电池有限公司 | Method and apparatus for battery vacuum sealing |
| CN101457154A (en) * | 2008-12-29 | 2009-06-17 | 保定天威集团有限公司 | Waste kerosene regeneration method in transformer kerosene vapor phase drying process |
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