WO2011050577A1 - Système et procédé permettant de réaliser un séchage en phase gazeuse du kérozène des transformateurs assemblés sur place - Google Patents

Système et procédé permettant de réaliser un séchage en phase gazeuse du kérozène des transformateurs assemblés sur place Download PDF

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Publication number
WO2011050577A1
WO2011050577A1 PCT/CN2010/001713 CN2010001713W WO2011050577A1 WO 2011050577 A1 WO2011050577 A1 WO 2011050577A1 CN 2010001713 W CN2010001713 W CN 2010001713W WO 2011050577 A1 WO2011050577 A1 WO 2011050577A1
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WO
WIPO (PCT)
Prior art keywords
kerosene
transformer
tank
vacuum
module
Prior art date
Application number
PCT/CN2010/001713
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English (en)
Chinese (zh)
Inventor
刘翮
种衍民
冷晨
刘小丹
王一军
Original Assignee
特变电工衡阳变压器有限公司
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from CN2010205271242U external-priority patent/CN201815160U/zh
Application filed by 特变电工衡阳变压器有限公司 filed Critical 特变电工衡阳变压器有限公司
Priority to EA201290253A priority Critical patent/EA030334B1/ru
Publication of WO2011050577A1 publication Critical patent/WO2011050577A1/fr

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/08—Cooling; Ventilating
    • H01F27/10—Liquid cooling
    • H01F27/12—Oil cooling
    • H01F27/14—Expansion chambers; Oil conservators; Gas cushions; Arrangements for purifying, drying, or filling

Definitions

  • This invention relates to the field of transformer manufacturing and, more particularly, to a system and method for vapor phase drying of a transformer body using a kerosene vapor phase drying process at a transformer installation site. Background technique
  • the on-site drying transformer generally adopts the following several conventional drying methods, such as: hot air vacuum drying, spray vacuum drying, current heating drying (including fuel tank eddy current heating method, zero sequence current heating method, short circuit current heating method).
  • hot air vacuum drying spray vacuum drying
  • current heating drying including fuel tank eddy current heating method, zero sequence current heating method, short circuit current heating method.
  • the above drying methods all have the disadvantages of low heating temperature, long heating time, uneven heating, and incomplete drying.
  • the best drying method is the gas phase drying method, which uses kerosene vapor as the heating medium, and the full drying process is carried out almost in an anaerobic condition, so The heating temperature is high, the drying speed is fast, the drying time is short, the heating is uniform, the drying is thorough, and the impurities on the transformer can be cleaned.
  • the gas phase drying system using the above gas phase drying method is a large and complicated system.
  • a sufficient water source and heat source are provided, and a large amount of Civil work, for example, requires the coarse filter to be built under the mantle to ensure the height difference between the dry volume and the coarse filter.
  • transformer manufacturers have made the gas phase drying system a fixed type, which is to be built on a fixed basis for drying and processing transformers in a transformer manufacturing plant.
  • the stationary vacuum tank is a main working container. When drying, the dried object is placed in a vacuum tank, and the vacuum tank is subjected to a process such as heating, vacuuming, and the like.
  • evaporators and the like are also disposed around the vacuum tank.
  • a steam pipe for heating and an insulation material for outer insulation and an outer jacket are provided on the outer wall of the vacuum tank, and the can lid (door) has a special hydraulic system to seal it.
  • the vacuum tank is also provided with a flat placed transformer body In the car, a traction device that allows the transformer to enter and exit the tank is provided outside the vacuum tank.
  • FIG. 1 is a schematic view showing the principle of a prior art external vaporizer vapor drying system, in which the single arrow is the kerosene vapor direction, the double arrow is the vapor return, and the third arrow is the kerosene return; in the figure, a vacuum device, 2—cooling water system, 3—vacuum tank door device, 4 vacuum tank, 5—condenser collecting system, 6—waste water receiving device, 7—evaporator, 8—waste oil tank, 9 one oil storage tank, 10— Water vapor supply system.
  • the working process of the stationary vapor phase drying process uses the following steps:
  • Step 1 After lifting the transformer body onto the flat car, pull the flat car into the vacuum tank with the traction device.
  • Step 2 Insert the temperature sensor on the transformer body, then close the vacuum tank door and press the vacuum tank door with the tank door pressing device.
  • the third step start the steam phase drying operation process.
  • the vapor phase drying process is divided into five phases:
  • the pressure inside the vacuum tank 4 is first lowered by means of the vacuum device 1, and the evaporator 7 starts to raise the temperature of the kerosene by the water vapor supplied from the steam supply system 10.
  • the evaporator 7 continues to raise the temperature of the kerosene by the water vapor supplied from the steam supply system 10, so that the kerosene liquid becomes kerosene vapor, and the kerosene vapor is sent to the vacuum tank 4 through the pipeline, thereby heating and placing in the vacuum tank.
  • Transformer body as the heating time increases, the transformer body is gradually heated, and the moisture in the insulating material on the transformer body begins to evaporate, forming a vacuum tank containing air leaking from kerosene vapor, water vapor and vacuum tank.
  • a mixed gas which is sent to a condenser 5 via a return line.
  • water vapor and kerosene vapor are condensed by the cooling water system 2, and the leaked air passes through a vacuum pump (not shown in FIG. It is shown that it is discharged into the atmosphere, and the condensed water and kerosene mixture are separated in the condenser due to the specific gravity, and then the separated kerosene is pumped to the evaporator 7 by an oil pump (not shown in Fig. 1). The recycled water is discharged to the wastewater receiving device 6.
  • the heating of the kerosene and the transportation of the kerosene vapor are stopped, and the mixed gas in the vacuum tank 4 is discharged by the vacuum device 1 to remain in the insulating material.
  • the kerosene in the re-evaporation when most of the moisture in the insulating material of the transformer has been eliminated, the heating of the kerosene and the transportation of the kerosene vapor are stopped, and the mixed gas in the vacuum tank 4 is discharged by the vacuum device 1 to remain in the insulating material. The kerosene in the re-evaporation.
  • the vacuum tank 4 is finally further evacuated by the vacuum device 1 to further evaporate the deep kerosene and water remaining in the insulating material until the end of the drying.
  • the vacuum stage that is, the aeration step, is released, and after the drying end condition is reached, the air is filled to remove the vacuum in the vacuum tank, and finally the product is discharged out of the tank.
  • the gas phase drying treatment system is relatively expensive to manufacture, economically uneconomical, and the system is limited by the environment, that is, a fixed vacuum tank must be used. Change The container of the press) is expensive, and it also needs to have sufficient water and heat sources. In addition, a large amount of civil works should be carried out. For example, the vacuum tank needs to be used as a foundation, and the coarse filter should be placed in a pit below the vacuum tank. In order to achieve the transformer vapor phase drying treatment. Therefore, such a vapor phase drying apparatus cannot be installed at the transformer installation site. Summary of the invention
  • the present invention provides a system and a method for assembling a transformer at a transformer installation site to realize vapor phase drying of kerosene, which is not applicable.
  • the environmental limitation allows the transformer to be vapor-phase dried at the transformer installation site, thereby overcoming the above-mentioned shortcomings and deficiencies in the prior art.
  • the present invention adopts a transformer tank for accommodating a transformer instead of a vacuum tank in a stationary vapor phase drying system, and the gas phase drying processing device is made into a modular type, and after the transformer is transported to the transformer installation site, The components of the system are assembled and connected to achieve vapor phase drying of the transformer at the transformer installation site.
  • the technical solution adopted to solve the technical problem of the present invention is a system for realizing kerosene vapor phase drying of a field assembled transformer, comprising a working container capable of accommodating a transformer and a vapor phase drying device disposed outside the working container, the system accommodating the transformer
  • the transformer tank is used as a working container for the vapor phase drying process, and the transformer tank is connected to the vapor phase drying device disposed outside thereof by a connecting pipe.
  • the transformer tank of the present invention is further provided with a gas passage, an oil passage and a temperature signal inlet for communicating with an external vapor phase drying device.
  • the gas path port comprises a kerosene vapor inlet and a vacuum port, the kerosene vapor inlet is disposed at a middle and a lower portion of a side of the transformer tank, and the vacuum port is disposed at a top of the transformer tank.
  • a guiding tube is disposed in the kerosene vapor inlet, and a supporting baffle is disposed on the guiding tube for diverting the kerosene vapor flowing into the guiding tube, thereby preventing overheating of the partial insulation of the transformer body at the kerosene vapor inlet.
  • a vacuum air inlet is attached to the vacuum line connected to the vacuum port, and a dry air generator is connected to the dry air inlet.
  • the oil junction of the present invention includes a kerosene first outlet and a kerosene second outlet.
  • the first outlet of the kerosene is disposed on the side wall at a certain height from the bottom of the transformer tank, as the main outlet of the transformer tank during the gas phase drying process, and the second outlet of the kerosene is disposed at the bottom of the transformer tank for The oil in the transformer tank is completely drained.
  • a kerosene return module is connected to the external outlet of the kerosene first outlet and the kerosene second outlet.
  • the temperature signal access port is disposed at a middle and a lower part of the transformer oil tank, and the temperature signal input port can be provided with a plurality of temperature sensors in the transformer oil tank, and the plurality of temperature sensors are respectively inserted into the transformer body.
  • the gas phase drying device includes a control device for automatically controlling the system, and the control device is connected to the temperature sensors through an output line, and each temperature sensor transmits the detected temperature signal to the control device.
  • the vapor phase drying apparatus of the present invention is assembled into a modular type.
  • the vapor phase drying apparatus can be fabricated into a vapor phase drying apparatus assembly module.
  • the vapor phase drying apparatus of the present invention is made into a plurality of modules.
  • the plurality of modules includes a vacuum condensation module, a kerosene vapor heating module, a kerosene return module, and a cooling module.
  • the cooling module is respectively connected with the vacuum condensing module and the kerosene steam heating module
  • the kerosene steam heating module is respectively connected with the kerosene return module and the vacuum condensing module
  • the transformer oil tank is respectively connected with the vacuum condensing module, the kerosene steam heating module and the kerosene return module.
  • the gas phase drying device further comprises an oil storage tank and a waste oil tank, wherein the oil storage tank and the waste oil tank are also made into a modular type, and the oil storage tank is connected to the vacuum condensation module and the kerosene steam heating module respectively.
  • the waste oil tank is connected to the kerosene vapor heating module.
  • the above modules are freely placed in a modular combination according to the terrain of the processing site, and a connecting pipe is provided between them.
  • the constitution of the vapor phase drying treatment system can be simplified, and the various parts of the system can be easily assembled quickly, thereby achieving the purpose of performing the vapor phase drying treatment of the transformer at the transformer site.
  • the vacuum condensing module, the kerosene vapor heating module, the kerosene return module, and the cooling module each employ a container structure. Since the outer package of the plurality of modules of the present invention employs a container structure, the installation work of the system is made simple and easy to operate.
  • the vacuum condensing module mainly comprises a vacuum unit, a condenser and a collecting tank, wherein an inlet of the condenser is connected with a vacuum port on the transformer tank, and an outlet thereof is respectively connected with the vacuum unit and the collecting tank;
  • the kerosene vapor heating module mainly comprises an evaporator and a heat transfer oil heater, wherein the heat transfer oil heater is used for heating the evaporator, the inlet of the evaporator is connected with the kerosene return module, and the outlet thereof is connected to the transformer tank The kerosene vapor inlet is connected;
  • the kerosene return module mainly comprises a coarse filter, the inlet of the coarse filter is respectively connected with the first outlet of the transformer kerosene and the second outlet of the kerosene, and the outlet thereof is connected with the evaporator;
  • the cooling module mainly includes a water tank and a chiller, and components in the modules are connected to each other by providing a connecting pipe.
  • the invention adopts a simple cooling module, which is composed of a large and small chiller and a water tank, and can be separately
  • the equipment in the air condensing module and the kerosene steam heating module supplies cooling water, which solves the problem of water shortage at the transformer installation site, omitting the larger cooling water system in the fixed gas phase drying system (since there is usually no water source inside the transformer manufacturing plant).
  • the problem therefore, the traditional fixed-type vapor phase drying system, generally need to build a 100m 3 - 300m 3 pool outside the plant, hit a deep well, and install a cooling tower on the pool for natural cooling water).
  • the cooling module is adopted in the invention, the structure is simple, the occupied position is small, and the water resource is greatly saved.
  • the invention has almost no need to waste water when drying, and the conventional fixed gas phase drying system is adopted due to the outdoor temperature in summer. High, it is necessary to rely on the release of a large amount of water to reduce the cooling water temperature, thus causing waste of water resources.
  • the evaporator used in the present invention is an external single evaporator for realizing kerosene evaporation and distillation, and the heat transfer oil heater heats the heat transfer oil by electricity, and then the heat transfer oil heats the kerosene, thereby changing the liquid kerosene into kerosene. Vapor.
  • the system of the present invention is not limited by the installation environment. BP, the system of the present invention does not require a sufficient heat source as in the conventional fixed vapor phase drying treatment to achieve a vapor phase drying treatment.
  • connection pipe of the system of the present invention employs a retractable pipe for compensating the connection.
  • the length of the connection can be arbitrarily expanded according to the terrain of the installation site.
  • a plastic hose with a steel wire is used, and the remaining connecting pipes are all made of a retractable stainless steel hose.
  • a second kerosene inlet is further disposed on the sidewall of the cavity.
  • the kerosene inlet may be in communication with a kerosene first outlet on a transformer tank, and the second kerosene inlet may be in communication with a kerosene second outlet on a transformer tank.
  • the first outlet of kerosene has a larger diameter and can use kerosene circulation. However, because it has a certain height from the bottom of the transformer tank, it cannot discharge all the kerosene at the bottom of the transformer tank; the second outlet of kerosene has a small caliber and cannot use kerosene circulation. However, the kerosene at the bottom of the transformer tank can be released.
  • the purpose of this design is to ensure that the drying is solved without changing the structure of the transformer tank. The problem of kerosene circulation in the process and the recovery of all kerosene in the transformer tank after drying.
  • the cavity extends rearward to form a collection chamber for accommodating the condensed kerosene liquid
  • the outer vacuum port is disposed on the corresponding cavity of the collection chamber.
  • the kerosene outlet is arranged at the bottom of the collecting chamber, and the bottom of the collecting chamber may further be provided with a kerosene conveying pump, and the condensed kerosene liquid flows out from the kerosene outlet after passing through the kerosene conveying pump.
  • a liquid level controller capable of controlling the start and stop of the kerosene pump can also be provided on the collection chamber.
  • the filter mesh is disposed in a middle portion of the cavity opposite to the kerosene inlet, and the filter mesh divides the cavity into a front portion of the cavity and a rear portion of the cavity, and the rear portion of the cavity is a collection cavity, and the front portion of the cavity
  • the bottom of the bottom is also provided with a sewage outlet, and the sewage outlet can remove impurities deposited in the cavity to facilitate cleaning.
  • the cavity is further covered with an insulation layer, and the insulation layer can heat the kerosene liquid stored in the cavity, and the kerosene liquid can be reduced during the heating process before the stored kerosene liquid enters the transformer tank again for recycling.
  • the heat loss in the role of energy saving.
  • the cavity is further provided with an inflation port (i.e., a vacuum release port) with an inflation valve for opening or closing the inflation port, and the front end of the inflation port is provided with an elbow.
  • an inflation port i.e., a vacuum release port
  • the inflation valve opens and the vacuum in the chamber is released through the inflation port. Setting the front end of the inflation port to the shape of the elbow can play a safety role, avoiding the operator's improper operation or malfunction due to equipment failure when cleaning the filter.
  • the vacuum is released, the high temperature kerosene liquid is ejected from the inflation port. Injury to the staff present.
  • an opening is formed at a position corresponding to the filter on the top of the cavity, and the opening is sealed by an openable cover plate, and the cover plate is provided with an observation window, and the operator can be at any time through the observation window. Watch the slag in the filter.
  • the above coarse filter has the following advantages: 1) no need to use civil engineering, that is, digging a pit on the ground, which greatly reduces the manufacturing cost of the transformer; 2) Cavity, kerosene pump does not need to be started frequently, it protects the coarse filter; 3) There is a bend at the front end of the inflation port, which makes the operation safer when the filter is replaced; 4) The insulation layer is provided outside the cavity , can reduce the energy loss in the drying process, and ultimately reduce the pressure change The cost of making the device.
  • the transformer tank is provided with a heat insulating device for holding the transformer tank.
  • the heat insulating device of the transformer tank of the present invention is provided with an insulating layer outside the transformer, and an auxiliary heating device disposed on the bottom and side walls of the transformer tank.
  • a base having an upper surface as an inclined surface is disposed under the bottom of the transformer tank, and the inclined surface is inclined along the length direction of the transformer tank so that the transformer tank placed thereon is inclined. Thanks to the sloping base, the transformer tank on it is tilted, which helps the oil in the transformer tank to flow smoothly out of the transformer tank.
  • the system further includes a control unit that automatically controls the entire system by using a computer, the control unit can realize unattended monitoring of the entire drying process, and the control unit can monitor the state or setting parameters of each component in the system. Running.
  • the present invention also provides a method for realizing gas phase drying of kerosene on a field assembled transformer, wherein the transformer to be dried is placed in a transformer tank, and the transformer tank is disposed in the connecting pipe.
  • the gas phase drying equipment outside the transformer tank is connected, and the transformer in the transformer tank is dried by the kerosene vapor phase drying treatment method. Therefore, by adopting the method of the present invention, the transformer tank can be replaced by the vacuum tank of the fixed vapor phase drying process, thereby reducing the equipment cost and realizing the purpose of gas phase drying treatment of the transformer at the transformer installation site.
  • the kerosene vapor phase drying treatment comprises a preparation step, a heating step, a pressure reduction step, a high vacuum step and a vacuum removal step; wherein, in the vacuum removal step, the dry air generated by the dry air generator is used to the transformer tank Release the vacuum. Therefore, it is ensured that the transformer is thoroughly dried and the transformer is protected from secondary moisture.
  • the present invention also includes a method for comprehensively determining the final moisture content of the transformer, and the method of judging includes the following aspects:
  • FIG. 1 is a schematic view showing a schematic diagram of a prior art fixed kerosene vapor phase drying treatment system
  • FIG. 2 is a schematic view showing a schematic diagram of a system for performing on-site vapor phase drying treatment of a transformer of the present invention
  • FIG. 3 is a flow chart showing the process of the kerosene vapor phase drying processing transformer of the present invention
  • Fig. 4 is a view showing the structure of the coarse filter of the present invention. detailed description
  • the present invention provides an on-site assembly transformer to realize kerosene vapor phase drying.
  • the present invention adopts a transformer tank for accommodating a transformer to replace the vacuum tank in the stationary vapor phase drying system, and the gas phase drying processing device is made into a modular type, and after the transformer is delivered, the system is The components are assembled and connected to achieve vapor phase drying of the transformer at the transformer installation site.
  • the present invention provides a system for performing on-site vapor phase drying of a transformer, comprising: transformer oil a tank 11, which serves as a working container for drying, places the transformer body to be dried in the transformer tank 11; a vapor phase drying device which is disposed outside the transformer tank 11; and is used for connecting the transformer tank 11 and the vapor phase drying setting Connect the pipe.
  • the transformer tank 11 is used as a working vessel in place of the vacuum tank in a conventional stationary vapor phase drying treatment system.
  • the transformer tank is used in the present invention to replace the vacuum tank in the prior art stationary vapor phase drying system, the installation (including the infrastructure installation work) and the cost of manufacturing the vacuum tank are eliminated, so that the equipment cost and installation of the entire drying treatment system are eliminated. The cost is greatly reduced.
  • the transformer tank as the working container of the drying treatment transformer, the composition of the entire drying treatment system is simplified, and the investment cost of the equipment such as the fixed vacuum tank is saved by about 2 million yuan.
  • a seal for sealing the transformer tank 11 is provided, and a heat insulating layer is provided on the outside of the transformer tank 11, and an auxiliary is also provided on the bottom and side walls of the transformer tank.
  • the heating device 21 only needs to remove the insulation layer outside the transformer tank 11 and the auxiliary heating device 21 after drying.
  • the oil passage of the transformer tank of the present invention includes a kerosene first outlet 15 and a kerosene second outlet 20. Kerosene first exit
  • the present invention employs the division of an external vapor phase drying apparatus into a plurality of modules.
  • the plurality of modules includes a vacuum condensation module 17, a kerosene vapor heating module 16, a kerosene return module 19, a cooling module 18, an oil storage tank 27, and a waste oil tank 26, which are combined in a modular manner according to the terrain of the transformer installation site. Placed on the ground.
  • the cooling module 18 is connected to the vacuum condensing module 17 and the kerosene steam heating module 16, respectively, and the kerosene steam heating module 16 is connected to the kerosene return module 19 and the vacuum condensing module 17, respectively, the transformer tank 11 and the vacuum condensing module 17, kerosene vapor.
  • the vacuum condensation module 17, the kerosene vapor heating module 16, the kerosene return module 19, and the cooling module 18 can be made into a container structure, and only the door on the container can be opened when in use. , Significant savings in installation and installation time.
  • the gas phase drying equipment adopts the above-mentioned combined modular type, the installation and operation of the entire system are made simple, safe and reliable, thereby greatly improving work efficiency.
  • the kerosene vapor heating module 16 mainly comprises an evaporator 24 and a heat transfer oil heater 25, etc., the heat transfer oil heater 25 is used for heating the evaporator 24, and the inlet of the evaporator 24 is connected with the kerosene return module 19, The outlet thereof is in communication with the kerosene vapor inlet 14 on the transformer tank;
  • the kerosene return module 19 mainly includes a coarse filter 34, etc., and the inlet of the coarse filter 34 is connected to the transformer kerosene first outlet 15 and the kerosene second outlet 20, respectively, and the outlet thereof is
  • the evaporator 24 is connected;
  • the cooling module 18 mainly includes a water tank 31 and a chiller unit 32, and a connecting pipe is disposed between the components in the modules.
  • the vacuum condensing module 17 may further include a control device 35 for automatically controlling the entire system.
  • the control unit 35 is in communication with the kerosene vapor heating module 16, the kerosene return module 19, and is in communication with other components in the vacuum condensing module 17.
  • a pneumatic device 36 for driving a pneumatic valve.
  • the pneumatic device 36 is in communication with the kerosene vapor heating module 16, the kerosene return module 19, and is in communication with other components in the vacuum condensing module 17 (because the kerosene vapor heating module 16, the kerosene return module 19, and the vacuum condensing module 17 are provided) Pneumatic valve).
  • the evaporator 24 in the kerosene vapor heating module 16 of the present invention is an external single evaporator for kerosene evaporation and distillation. Because the installation site is not as dry as in the manufacturing plant, BP uses the steam to turn the kerosene into kerosene vapor to dry the transformer. Therefore, in the kerosene vapor phase drying system where the transformer is assembled on site, a heat transfer oil heater is installed. 25.
  • the heat transfer oil heater 25 has a simple structure, a small occupied position, and a low manufacturing cost. More advantageously, the kerosene heating by the steam supply system easily corrodes the heating pipe, causing the heating pipe to rust and cause steam leakage. The production cost and the maintenance cost are increased. Therefore, the use of the heat transfer oil in the invention avoids the disadvantage of steam heating and solves the practical problems at the transformer site.
  • the present invention employs a combined cooling module 18 provided with a chiller unit 32 and a water tank 31. Through this setting, the problem of no water source at the transformer installation site is solved, and the cooling effect of the system is also ensured. Due to the above structure, the vapor phase drying treatment system of the system is not limited by the installation environment, that is, the vapor phase drying treatment can be realized without having a sufficient water source and heat source.
  • the cooling water of the cooling module 18 is used to cool the high temperature oil pump in the kerosene steam heating module 16 during heating (there may be a plurality of high temperature oil pumps, a high temperature oil pump for transporting the heat transfer oil to the evaporator 24, and also for A high temperature oil pump that circulates the kerosene in the evaporator 24 and a condenser 29 of the vacuum condensing module 17.
  • the oil storage tank 27 can store the kerosene used in the drying process.
  • the waste oil tank 26 is used to store the transformer oil on the transformer body separated by the distillation method when the transformer with transformer oil is dried.
  • the kerosene return module 19 is connected to the kerosene first outlet 15 and the kerosene second outlet 20, respectively, and the kerosene return module includes a coarse filter 34.
  • the coarse filter includes a cavity 323.
  • the cavity 323 is provided with a kerosene inlet 322 and a kerosene outlet 319.
  • the cavity 323 is further provided with a filter 320 for filtering slag in the kerosene liquid.
  • the body 323 is provided with an outer vacuum port 315 that can be connected to an external vacuum system.
  • the kerosene inlet 322 is disposed on a sidewall of the cavity 323 opposite the filter screen 320, and the kerosene inlet 322 can be in communication with the kerosene first outlet 15 on the transformer tank.
  • a second kerosene inlet 310 may also be provided in the side wall of the cavity 323, and the second kerosene inlet 310 may be in communication with the kerosene second outlet 20 on the transformer tank.
  • a collection chamber 314 capable of containing a kerosene liquid is formed by extending the cavity 323 rearward, and the outer vacuum port 315 is disposed on a corresponding cavity of the collection chamber 314.
  • the filter net 320 is a semi-cylindrical shape with a pocket, and the cavity 323 is divided into a front portion of the cavity and a rear portion of the cavity through the filter net 320.
  • the rear portion of the cavity is a collection chamber 314, and the front portion of the cavity
  • a drain outlet 321 may also be provided at the bottom.
  • the kerosene outlet 319 is disposed at the bottom of the collection chamber 314, and a kerosene delivery pump 318 is disposed at the bottom of the collection chamber 314.
  • the kerosene liquid flows out of the kerosene outlet 319 via the kerosene delivery pump 318.
  • a liquid level controller 316 is also provided on the collection chamber 314 for controlling the start and stop of the kerosene delivery pump 318.
  • the cavity 323 is provided with an inflation port 311 having an inflation valve, and the front end of the inflation port 311 is provided with an elbow.
  • An opening is provided at a position corresponding to the filter net 320 at the top of the cavity 323, and the opening is sealed by an openable cover 312, and a viewing window is opened on the cover 312.
  • the cavity 323 is also covered with an insulating layer 317.
  • the heated kerosene liquid flows out from the kerosene first outlet 15 of the transformer tank or the kerosene second outlet 20, and passes through the kerosene inlet 322 or the second kerosene inlet on the cavity 323.
  • the kerosene liquid filtered into the cavity 323 of the coarse filter and filtered by the filter 320 is transported by the kerosene transfer pump 318, and is sent out from the kerosene outlet 319, and sent to the gas phase drying equipment for recycling, and the excess kerosene is filtered.
  • the liquid continues to be stored in the collection chamber 314.
  • the liquid level controller 316 can control the start and stop time of the kerosene delivery pump 318 according to the amount of kerosene in the collection chamber 314.
  • the filter 320 When the operator sees that the filter 320 is clogged from the observation window on the cover 312, it is only necessary to cut off the passage of the kerosene liquid into the filtering device, and the inflation port 311 is opened by operating the inflation valve, thereby releasing the cavity 323. The vacuum inside. After the inflation process is completed, the compression screw 313 is loosened, the cover 312 is opened, the filter 320 is taken out, and it is cleaned. After the filter 320 is cleaned, reverse the operation and re-install the above components to resume the operation of the coarse filter.
  • an insulating test block is placed through the manhole observation window for detecting the water content of the insulating test piece after drying, for evaluating the drying effect of the drying process;
  • the present invention also provides a method for realizing gas phase drying of kerosene on a field assembled transformer, wherein the transformer to be dried is placed in a transformer tank, and the transformer tank is disposed in the transformer by using a connecting pipe.
  • the gas phase drying equipment outside the fuel tank is connected, and the kerosene vapor phase drying treatment method is used to dry the transformer in the transformer tank. Therefore, by adopting the method of the present invention, the transformer tank can be substituted for the vacuum tank of the stationary vapor phase drying system, thereby reducing the equipment cost and realizing the purpose of vapor phase drying of the transformer at the transformer installation site.
  • the drying process of the transformer of the present invention is substantially the same as the stationary gas phase drying process.
  • the process is divided into five operation steps, namely: a preparation step, a heating step, a depressurization step, a high vacuum step and a vacuum removal step, below, The above steps will be described below with reference to FIG. 3.
  • preparation step R using vacuum unit 30 to vacuum the transformer tank 11 at room temperature;
  • the kerosene vapor encounters the cold transformer body, it condenses into a liquid and is discharged from the bottom of the transformer tank (the kerosene liquid automatically flows out from the first outlet of kerosene or the second outlet of kerosene according to the level of kerosene at that time), and then returns to In the evaporator 24, the heating cycle is repeated in the evaporator 24.
  • the kerosene vapor does not completely condense but accumulates in the transformer tank, but still exists in the form of a gas.
  • the kerosene and water are different in specific gravity, the kerosene and water are separated by sedimentation in the collecting tank 28, and the water therein is discharged to the wastewater collecting device 33, and the kerosene liquid is Re-use into the evaporator 24 again creates a second cycle, while the permanent gas is vented to the atmosphere by the vacuum unit 30.
  • the transformer body is gradually heated. When heated for a certain period of time, the pressure in the transformer tank 11 and the pressure in the evaporator 24 will approach equilibrium, and one or several intermediate pressure reductions, that is, the intermediate step-down step IPL, that is, the kerosene to the transformer tank 11 will be cut off.
  • the vapor inlet passage, the intermediate pressure reduction is achieved by using a vacuum condensation module to reduce the pressure of the transformer tank to help the kerosene vapor enter the transformer tank 11.
  • a vacuum condensation module to reduce the pressure of the transformer tank to help the kerosene vapor enter the transformer tank 11.
  • Step 3 Step-down step P.
  • the temperature of the transformer body reaches about 120'C, most of the moisture in the transformer insulation material has been removed, and then the kerosene liquid is stopped to be transported to the evaporator.
  • the vacuum unit 30 to the transformer tank
  • Step 4 High vacuum step V, further vacuuming the transformer tank 11 with a vacuum unit 30 to further evaporate the deep kerosene and water remaining in the insulating material until the end of drying.
  • the vapor phase drying treatment process of the present invention is substantially the same as the stationary vapor phase drying process as compared with the stationary vapor phase drying process, but the internal environment of the drying system of the transformer vapor phase drying process of the present invention is changed, The external drying equipment has been modified and adjusted so that the various control parameters of the process of the drying process of the present invention vary greatly.
  • the kerosene delivery pipeline is not as long as the fixed vacuum tank, so the invention reduces the energy loss during the kerosene vapor transport process.
  • the following method is used for judging: When the pressure in the transformer tank is close to atmospheric pressure, the population on the transformer tank is opened, and the insulation is removed. Test block, detecting the moisture content of the insulation. In the present invention, the insulating test block is provided to better judge the final moisture content of the transformer.
  • the system and method provided by the present invention solves the problem of vapor phase drying treatment of a transformer at a transformer assembly site, and simplifies the composition of the vapor phase drying treatment system while improving the quality of the transformer drying process, and Some are easy to install and transport. All the technical features or contents shown in the drawings are to be construed as illustrative and not restrictive.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Drying Of Solid Materials (AREA)

Abstract

La présente invention se rapporte à un système et à un procédé permettant de réaliser un séchage en phase gazeuse du kérozène des transformateurs assemblés sur place. Un réservoir de transformateur (11) pour contenir un transformateur sert de récipient de travail pour un processus de séchage en phase gazeuse. Le réservoir de transformateur est raccordé par des tuyaux de raccordement à des équipements de séchage en phase gazeuse disposés à l'extérieur. Les équipements de séchage en phase gazeuse sont assemblés dans un module. Le système est plus simple tout en réduisant les coûts de fabrication et d'installation d'un système permettant un processus de séchage en phase gazeuse d'un transformateur.
PCT/CN2010/001713 2009-10-30 2010-10-28 Système et procédé permettant de réaliser un séchage en phase gazeuse du kérozène des transformateurs assemblés sur place WO2011050577A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EA201290253A EA030334B1 (ru) 2009-10-30 2010-10-28 Система и способ газофазной сушки керосином трансформаторов, собранных на месте монтажа

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
CN200910205596.8 2009-10-30
CN200910205596 2009-10-30
CN201020527124.2 2010-09-10
CN2010205271242U CN201815160U (zh) 2010-09-10 2010-09-10 一种气相干燥设备中的过滤装置

Publications (1)

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WO2011050577A1 true WO2011050577A1 (fr) 2011-05-05

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WO (1) WO2011050577A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103579927A (zh) * 2012-07-18 2014-02-12 上海宝钢工业技术服务有限公司 大型变压器线圈内径侧无损检修方法
CN116313464A (zh) * 2023-04-19 2023-06-23 山东特变电力设备有限公司 一种油浸式变压器生产用注油装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002280243A (ja) * 2001-03-21 2002-09-27 Fuji Electric Co Ltd 電気機器の乾燥方法および乾燥装置
CN1440827A (zh) * 2002-02-28 2003-09-10 威廉·海德里希真空设备两合公司 变压器的整备装置
JP2005183857A (ja) * 2003-12-24 2005-07-07 Aichi Electric Co Ltd 変圧器の乾燥処理方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002280243A (ja) * 2001-03-21 2002-09-27 Fuji Electric Co Ltd 電気機器の乾燥方法および乾燥装置
CN1440827A (zh) * 2002-02-28 2003-09-10 威廉·海德里希真空设备两合公司 变压器的整备装置
JP2005183857A (ja) * 2003-12-24 2005-07-07 Aichi Electric Co Ltd 変圧器の乾燥処理方法

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103579927A (zh) * 2012-07-18 2014-02-12 上海宝钢工业技术服务有限公司 大型变压器线圈内径侧无损检修方法
CN116313464A (zh) * 2023-04-19 2023-06-23 山东特变电力设备有限公司 一种油浸式变压器生产用注油装置
CN116313464B (zh) * 2023-04-19 2023-11-10 山东特变电力设备有限公司 一种油浸式变压器生产用注油装置

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EA030334B1 (ru) 2018-07-31

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