CN113257529A - Liquid-immersed non-combustible power transformer - Google Patents
Liquid-immersed non-combustible power transformer Download PDFInfo
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- CN113257529A CN113257529A CN202110763196.XA CN202110763196A CN113257529A CN 113257529 A CN113257529 A CN 113257529A CN 202110763196 A CN202110763196 A CN 202110763196A CN 113257529 A CN113257529 A CN 113257529A
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- 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
- H01F27/18—Liquid cooling by evaporating liquids
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- 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
- H01F27/105—Cooling by special liquid or by liquid of particular composition
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- 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
- H01F27/22—Cooling by heat conduction through solid or powdered fillings
Abstract
The invention relates to and discloses a liquid-immersed non-combustible power transformer used in the fields of offshore wind power, pumped storage, urban power grids and the like, which comprises a box body, a transformer body, an on-load tap changer, a radiator and a condenser, wherein the transformer body is provided with a plurality of transformer bodies; the box body is also filled with a solid insulating filling part and a non-combustible insulating liquid which is liquid at normal temperature and has no flash point; the solid insulating filling pieces are arranged between windings of the transformer body and between the transformer body and the inner wall of the box body so as to enhance the short-circuit resistance of the transformer, guide the flowing direction of the non-combustible insulating liquid and improve the flowing speed of the non-combustible insulating liquid; and the transformer body, the on-load tap-changer and the solid insulating filling piece are all immersed in the non-combustible insulating liquid. The invention realizes oil-free and non-combustible of the transformer, can effectively improve the operation safety of offshore wind power, pumped storage power stations and urban power grids, avoids fire hazard and reduces the accident operation and maintenance cost.
Description
Technical Field
The invention relates to a power transformer, in particular to the fields of a wind power booster station power transformer, a wind power tower transformer, a wind power cabin transformer, a pumped storage power station booster station power transformer, an urban power grid power transformer and the like.
Background
In order to realize the goals of carbon peak reaching in 2030 and carbon neutralization in 2060, constructing a novel power system taking new energy as a main body becomes an important work task in the lower stage of energy power in China; the proportion of clean energy such as offshore wind power, solar photovoltaic, nuclear power and the like is expected to reach 80 percent, and the energy supply device becomes a future energy supply main body in China. In a novel power system architecture, the energy storage ratio is required to be not less than 10%, and pumped storage serving as the main force of energy storage is rapidly developed. It is expected that the scale of application of offshore wind power transformers and pumped storage transformers will increase greatly.
With the change of application scenes, the requirement on the fire protection capability of the power transformer is more and more strict. Offshore wind power is far away from tens of hundreds of kilometers on land, and pumped storage power generation is deep into the ground for hundreds of meters, so that fire rescue is extremely inconvenient due to the particularity of the geographical environment, and once a fire disaster occurs on equipment, the safety of an offshore wind power plant and a pumped storage power station is greatly influenced, and great loss is caused.
At present, a 220kV main transformer of an offshore wind power booster station is usually a mineral oil power transformer or a vegetable oil power transformer, wherein the vegetable oil transformer is mainly imported from foreign countries. Considering that the dry-type transformer is not sealed by a box body, and how to prevent moisture and corrosion is a big problem under the condition of long-term operation on the sea, the offshore wind power 35kV tower transformer or 35kV engine room transformer gradually develops towards vegetable oil and high ignition point oil transformers.
The pumped storage booster station is mainly changed or is mainly provided with a mineral oil power transformer, the ignition point of mineral oil is about 130 ℃, the ignition point of vegetable oil is about 300-350 ℃, the ignition point of high-ignition-point oil is more than 300 ℃, when major faults occur in the transformer, such as turn-to-turn short circuit or interphase short circuit of a transformer winding, the temperature of the fault point reaches thousands of degrees, the mineral oil, the vegetable oil and the high-ignition-point oil can be combusted, and the mineral oil, the vegetable oil and the high-ignition-point oil are difficult to extinguish after the combustion.
Along with the development of urban novel power systems, the urban comprehensive energy body mode of a transformer substation, an energy storage power station, an electric vehicle charging station and a large data center 'multi-station-in-one' and the distributed energy storage power station for peak clipping, valley filling and new energy consumption promotion are becoming the new development direction of urban power grids to realize the conversion of urban energy consumption to green energy, and the novel energy power infrastructures all provide higher requirements for the fire safety level of equipment.
In addition, various cities have innovated and promoted various novel construction modes such as transformer substation and building pasting construction, linkage construction and transformer substation embedding building, and the transformer substation is in crowd and the intensive region of building, adopts oil-immersed power transformer to have the conflagration hidden danger.
In practice, the failure rate of the power transformer caused by the heat dissipation problem is up to 40%, and the heat dissipation capability directly influences the operation economy and stability of the transformer. The vegetable oil and the high-ignition-point oil have high viscosity, poor fluidity and low specific heat capacity. The dry-type transformer adopts air as a cooling medium, and the air heat conductivity coefficient and the specific heat capacity are smaller. The transformer room of the pumped storage booster station, whether a wind power tower barrel, a wind power cabin or a few hundred meters deep underground, is a closed space, air circulation is not smooth, the actual conditions that heat dissipation is difficult exist in the vegetable oil transformer, the transformer with high ignition point oil and the dry-type transformer, once the temperature rise of the transformer is too high, the insulation material in the transformer is deteriorated, and therefore, the insulation breakdown causes a major short circuit fault in the transformer, and combustion and explosion can be possibly caused for the vegetable oil transformer and the transformer with high ignition point oil. Meanwhile, for offshore wind power and pumped storage power stations, transformer replacement is a very difficult project, the replacement cost is very high, the service life of the transformer needs to be prolonged to the maximum extent, and the replacement period is shortened.
The heat dissipation capacity of the power transformer is improved, the heat failure rate can be reduced, the service life is prolonged, the safe operation of the transformer is facilitated, and the method has positive significance for the development of novel energy power infrastructures of wind power, pumped storage and urban power grids in China.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide the liquid-immersed non-combustible power transformer which is suitable for offshore wind power, pumped storage power stations and novel urban power systems.
The invention solves the problems thatThe technical scheme adopted by the technical problem is as follows: the liquid-immersed non-combustible power transformer comprises a box body, a transformer body, an on-load tap-changer, a radiator and a condenser, and is characterized in that the transformer body and the on-load tap-changer are arranged in the box body; the box body is also filled with a solid insulating filling part and a non-combustible insulating liquid which is liquid at normal temperature and has no flash point; the transformer body, the on-load tap-changer and the solid insulating filling piece are all immersed in the non-combustible insulating liquid; the breakdown voltage of the non-combustible insulating liquid is more than or equal to 45kV under the condition that the electrode spacing is 2.5mm, the water content is less than or equal to 20mg/kg, the loss factor at 90 ℃ is less than or equal to 0.005, the heat conductivity coefficient is 0.2-0.7W/m.k, and the kinematic viscosity at 25 ℃ is less than or equal to 5mm2S; the solid insulating filling part is made of an A-grade insulating material, and the flame resistance of the A-grade insulating material is ensured and improved through the soaking and covering effects generated by soaking and permeating the non-combustible insulating liquid, and the physical properties of the A-grade insulating material, such as heat resistance, mechanical strength, electrical performance and the like, are not reduced; the solid insulating filling pieces are arranged between windings of the transformer body and between the transformer body and the inner wall of the box body so as to enhance the radial short-circuit resistance of the liquid-immersed non-combustible power transformer; and a heat dissipation channel is arranged in the solid insulating filling piece to guide the flowing direction of the non-combustible insulating liquid and improve the flowing speed of the non-combustible insulating liquid.
In the preferable scheme of the invention, the non-combustible insulating liquid has micro phase change at normal temperature, the phase change quantity is gradually increased along with the temperature rise, and when a local heat concentration area appears on the transformer body, the non-combustible insulating liquid in the area can quickly take away heat and eliminate hot spots through phase change heat transfer so as to ensure that the temperature field in the transformer is uniformly distributed.
In the preferred scheme of the invention, the solid insulating filling pieces arranged between the windings of the transformer body are cylindrical, square or fan-shaped, so as to enhance the radial short-circuit resistance of the transformer; one or more cylindrical heat dissipation channels are arranged in the solid insulating filling piece along the vertical direction, and the diameter of each cylindrical heat dissipation channel is equal to or less than 1cm, so that the non-combustible insulating liquid can flow through the heat dissipation channels to form directional convection. Wherein, the lower heat dissipation channel opening of the solid insulating filling member is preferably in a horn shape.
In a preferred embodiment of the present invention, the solid insulating filler installed between the transformer body and the inner wall of the tank includes an insulating paper sheet and insulating support bars adhered to both sides of the insulating paper sheet, and a heat dissipation channel for flowing the non-combustible insulating liquid is formed between two adjacent insulating support bars. And a plurality of rows of round holes are arranged on the insulating paper board in parallel along the transverse direction in the range from the height of about 1/3 to the top of the body, and the round holes are positioned at the interval between every two adjacent insulating supporting strips. And an opening is arranged at the position, corresponding to the liquid inlet and outlet of the radiator, on the solid insulating filling piece, and the diameter of the opening is the same as or slightly larger than that of the liquid inlet and outlet of the radiator, so that a heat dissipation channel for the non-combustible insulating liquid to flow is formed.
In a preferred scheme of the invention, the A-grade insulating material is made of insulating paper, insulating paperboard and insulating wood blocks.
In the preferred scheme of the invention, the radiator is arranged on the outer walls of the long edges at two sides of the box body and is connected with the box body through the liquid inlet and outlet; or the radiator and the box body are separately installed, and the horizontal height of the radiator is not lower than that of the box body.
In the preferred scheme of the invention, the condenser is arranged at the top of the box body, one end of an air inlet pipeline of the condenser is connected with the side wall of the condenser, and the other end of the air inlet pipeline of the condenser is connected with the top of the box body; one end of a liquid return pipeline of the condenser is connected with the bottom of the condenser, and the other end of the liquid return pipeline is connected with the bottom of the box body or a position close to the bottom on the side wall of the box body.
In the preferred scheme of the invention, a mechanical pressure release valve and a positive arch-shaped blasting diaphragm are arranged at the top of the box body and are matched to form a pressure release system in a diaphragm valve combination mode.
According to the scheme, the non-combustible insulating liquid is used as the transformer insulating cooling medium, so that the transformer is non-oiled and non-combustible, the transformer cannot burn and explode under any operation working condition, the fire hazard can be thoroughly eradicated, secondary accident disasters are prevented, the transformer is a better choice for offshore wind power and pumped storage power stations undoubtedly, the fire safety level of the transformer can be improved, and the accident operation and maintenance cost is reduced. For urban distributed energy storage, the product provided by the invention is adopted to replace an oil-immersed power transformer, the fire safety level of equipment in a station is improved, the distributed energy storage can be facilitated to go deep into a user side, a distributed energy storage system can be more flexibly arranged according to needs when a novel urban power grid framework is designed at the top layer and integrally planned, the limitation of the surrounding environment is avoided, and the product has a positive effect on the development of an urban energy storage technology. For various novel transformer substations such as being attached to, connected with and embedded in buildings, the product of the invention can improve the fire safety level of the transformer substations, avoid the generation of fire disasters from bringing great influence on adjacent buildings and people, and is also a better choice for the transformer substations.
The incombustible insulating liquid has the advantages of high heat conductivity coefficient, high temperature conduction speed, small viscosity, good fluidity and phase change capability, and can be used for uniformly distributing the temperature field in the transformer, effectively reducing the temperature difference in the transformer and increasing the temperature difference between the radiator and the external ambient air. The heat generated by the transformer is finally dissipated to the external environment through the heat sink, so that the heat dissipation efficiency is improved under the condition of not increasing the number or size of the heat sinks, and the increase of the temperature difference between the heat sinks and the external environment air is an extremely effective method. The invention can effectively improve the heat dissipation efficiency of the transformer, reduce the running temperature rise and the load loss of the transformer, reduce the thermal failure rate of the transformer, prolong the service life of the transformer and improve the economy and the reliability of the transformer.
The solid insulation is adopted to fill the inner gap of the transformer, the radial short circuit resistance of the transformer is enhanced, the non-combustible insulating liquid is guided to flow directionally, the flowing speed is increased, the heat dissipation efficiency is improved, and meanwhile, the using amount of the non-combustible insulating liquid is reduced, so that the manufacturing cost of the transformer is reduced.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a front perspective view of a liquid-immersed non-combustible power transformer in a preferred embodiment of the invention;
FIG. 2 is a cross-sectional top view of the liquid-immersed non-combustible power transformer shown in FIG. 1;
FIG. 3 is a cross-sectional side view of the liquid-immersed non-combustible power transformer shown in FIG. 1;
FIG. 4 is a perspective side sectional view of the solid insulating infill shown in FIG. 1;
fig. 5 is a perspective front view of the insulating paper sheet and the insulating stays shown in fig. 1.
Detailed Description
For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
As shown in fig. 1 to 5, the liquid-immersed non-combustible power transformer comprises non-combustible insulating liquid 100, a tank 101, a transformer body 102, a solid insulating filler 103, an on-load tap-changer 104, a radiator 105, a condenser 106 and the like. The transformer body 102 and the on-load tap-changer 104 are arranged in the box body 101; the transformer body 102, the solid insulating filler 103 and the on-load tap-changer 104 are all immersed in the non-combustible insulating liquid 100.
Wherein, the breakdown voltage of the non-combustible insulating liquid 100 when the electrode spacing is 2.5mm is more than or equal to 45kV, the water content is less than or equal to 20mg/kg, the loss factor (90 ℃) is less than or equal to 0.005, and the requirements of the insulating property of power transformers of 35kV, 66kV, 110kV and 220kV can be met. The heat conductivity coefficient of the non-combustible insulating liquid is 0.2-0.7W/m.k, and the kinematic viscosity (25 ℃) is less than or equal to 5mm2And/s, heat can be rapidly transferred to the inner wall of the radiator from the surface of the transformer body through conduction and convection, the temperature difference inside the transformer is reduced to about 5-10 k, and the temperature difference between the outer wall of the radiator and air is increased to about 50-55 k, so that the radiator has higher radiating efficiency under the same radiating area. After absorbing the heat energy generated by the transformer body, the non-combustible insulating liquid can be partially gasified, a corresponding motion pressure head is generated through phase change, the driving force of static pressure head generated only by temperature difference is promoted, the dynamic pressure head is increased along with the increase of heat load, the flow of the non-combustible insulating liquid in the transformer body and a heat dissipation channel of a solid insulating filling piece is accelerated, and the contact surface of the transformer body and the non-combustible insulating liquid is disturbedThe thermal boundary layer changes from laminar flow to overflow, and the heat dissipation efficiency is increased. The solid insulation filling member 103 arranged between the transformer body and the inner wall of the box body is used for increasing the radial short circuit resistance of the transformer and reducing the using amount of the non-combustible insulating liquid 100, one or more cylindrical heat dissipation channels 31 are arranged in the solid insulation filling member 103 along the vertical direction, the diameter of each cylindrical heat dissipation channel is equal to or less than 1cm, the cylindrical heat dissipation channels can be used as heat dissipation channels for the flow of the non-combustible insulating liquid, the non-combustible insulating liquid is guided to flow directionally, the flow speed is increased, and meanwhile, the non-combustible insulating liquid can be better impregnated into the solid insulation filling member 103. The solid insulating filling piece can be made of A-grade insulating materials such as insulating paperboards and insulating wood blocks, or epoxy resin, and the like, and can be cylindrical, square or fan-shaped, and if the solid insulating filling piece is square or fan-shaped, the edges and corners need to be rounded; and the heat dissipation channel opening at the lower part of the solid insulation filling part is in a horn shape.
The non-combustible insulating liquid 100 can change phase, a local heat concentration area appears on the transformer body 102, the non-combustible insulating liquid 100 in the area takes away heat quickly through phase change heat transfer, hot spots are eliminated, the distribution of the temperature field in the transformer is uniform, and the hot spots are eliminated.
A solid insulating filling member is also arranged between the transformer body 102 and the inner wall of the box body 101, specifically, a combination mode of an insulating paper board and insulating support bars is provided, the solid insulating filling member comprises the insulating paper board 302, the insulating support bars 303 are adhered to two sides of the insulating paper board 302, and the interval between two adjacent insulating support bars 303 can be used as a heat dissipation channel for the non-combustible insulating liquid 100 to flow. The noncombustible insulating liquid 100 in the heat dissipation channel between the insulating stays 303 near the inner wall of the tank can quickly transfer heat to the inner wall of the tank.
In the range from the height of the insulating paper board 302 corresponding to about 1/3 of the transformer body to the top of the transformer body, a plurality of rows of round holes 32 are arranged side by side along the transverse direction, the round holes 32 are positioned in the intervals between the insulating supporting strips 303, each interval can be provided with the round holes 32, and the round holes 32 can also be arranged at a plurality of intervals, so that the heat generated by the transformer body 102 can be conducted to the inner wall of the box body.
The insulating paper board 302 and the insulating support bars 303 at two sides, which are corresponding to the liquid inlet 33 and the liquid outlet 34 of the radiator, are respectively provided with an opening 35, the diameter of the opening 35 is the same as or slightly larger than the diameter of the liquid inlet and the liquid outlet of the radiator, and the opening can be used as a convection channel of the non-combustible insulating liquid 100.
After the non-combustible insulating liquid 100 absorbs heat generated by the transformer body 102, density difference is generated, a thermal siphon effect is formed in a heat dissipation channel of the transformer body 102, a heat dissipation channel 31 in the solid insulating filling piece 103 and a channel among the insulating struts 303, the flowing speed is higher, and therefore the heat dissipation efficiency can be improved while the using amount of the non-combustible insulating liquid 100 is reduced.
The heat of the transformer is transmitted to the radiator 105 through the non-combustible insulating liquid 100 and then is dissipated to the external environment through the radiator 105, the heat dissipation of the radiator 105 to the external environment is mainly achieved through air convection, and the calculation formula is as follows:
Q=α（tw-tf）F
wherein Q is the convective heat transfer quantity, alpha is the convective heat transfer coefficient, tw、tfThe average temperature of the surface of the outer wall of the radiator and the air is respectively, and F is the effective convection heat exchange area of the radiator.
Through the calculation formula, it can be seen that the heat dissipation efficiency of the transformer radiator 105 is related to the temperature difference and the heat dissipation area.
According to the invention, the non-combustible insulating liquid 100 has high heat conductivity coefficient, low viscosity and high convection rate, the temperature field in the transformer is uniform, and the temperature difference gradient is small, so that the temperature difference between the radiator 105 and the external ambient air is raised, the radiating efficiency of the radiator to the environment is improved, and the running temperature rise of the transformer is reduced; or the number of radiators can be reduced under the same heat dissipation requirement, so that the volume of the transformer is reduced.
As shown in fig. 1, the condenser 106 is connected to an intake pipe 21 and a return pipe 22. One end of the air inlet pipeline 21 is connected with the side wall of the condenser 106, and the other end is connected with the top of the box body 101; the return pipe 22 is connected at one end to the bottom of the condenser 106 and at the other end to the bottom of the tank 101 or to a position on the side wall of the tank near the bottom of the tank. The gasified non-combustible insulating liquid 100 enters a condenser 106 through an air inlet pipeline 21 for condensation, and the liquefied non-combustible insulating liquid 100 flows back to the box body 101 through a liquid return pipeline 22 to participate in heat dissipation again.
A mechanical pressure relief valve 201 and a burst disk 202 mounted on top of the tank 101 constitute a transformer pressure relief system. When the transformer is overloaded for a long time or has internal failure, the internal pressure is increased, and the internal pressure needs to be released through a pressure release system to ensure the safety of the transformer. When the internal pressure of the transformer is increased at a low speed due to long-time overload, the mechanical pressure release valve 201 acts first to open the pressure release channel to release the pressure because the action value of the mechanical pressure release valve 201 is lower than that of the rupture diaphragm 202. When the pressure is rapidly increased due to the extreme fault in the transformer and the pressure rising rate is higher than 200kPa/s, the burst diaphragm 202 is instantaneously burst when the mechanical pressure release valve 201 does not react, and the pressure release channel is opened to release the pressure.
In specific implementation, the insulating cooling medium in the switch chamber of the on-load tap-changer 104 can be replaced by the non-combustible insulating liquid 100 from mineral insulating oil, so that the effects of insulation, arc extinction, heat absorption and the like are achieved, and the oil-free performance of the whole transformer is realized.
Claims (12)
1. A liquid-immersed non-combustible power transformer comprises a box body, a transformer body, an on-load tap-changer, a radiator and a condenser, and is characterized in that the transformer body and the on-load tap-changer are arranged in the box body; the box body is also filled with a solid insulating filling part and a non-combustible insulating liquid which is liquid at normal temperature and has no flash point; the transformer body, the on-load tap-changer and the solid insulating filling piece are all immersed in the non-combustible insulating liquid;
the breakdown voltage of the non-combustible insulating liquid is more than or equal to 45kV under the condition that the electrode spacing is 2.5mm, the water content is less than or equal to 20mg/kg, the loss factor at 90 ℃ is less than or equal to 0.005, the heat conductivity coefficient is 0.2-0.7W/m.k, and the kinematic viscosity at 25 ℃ is less than or equal to 5mm2/s；
The solid insulating filling part is made of an A-grade insulating material, and the flame resistance of the A-grade insulating material is ensured and improved through the soaking and covering effects generated by soaking and permeating the non-combustible insulating liquid, and the physical properties of the A-grade insulating material, such as heat resistance, mechanical strength, electrical performance and the like, are not reduced; the solid insulating filling pieces are arranged between windings of the transformer body and between the transformer body and the inner wall of the box body so as to enhance the radial short-circuit resistance of the liquid-immersed non-combustible power transformer; and a heat dissipation channel is arranged in the solid insulating filling piece to guide the flowing direction of the non-combustible insulating liquid and improve the flowing speed of the non-combustible insulating liquid.
2. The liquid-immersed non-combustible power transformer of claim 1, wherein the non-combustible insulating liquid has a slight phase change at normal temperature, the phase change amount gradually increases with the temperature rise, and when a local heat concentration area appears on the transformer body, the non-combustible insulating liquid in the area can rapidly take away heat and eliminate hot spots through phase change heat transfer so as to ensure that the temperature field inside the transformer is uniformly distributed.
3. The liquid-immersed non-combustible power transformer according to claim 1, wherein the solid insulating fillers installed between windings of the transformer body are cylindrical, square or fan-shaped to enhance the radial short-circuit resistance of the transformer; one or more cylindrical heat dissipation channels are arranged in the solid insulating filling piece along the vertical direction, and the diameter of each cylindrical heat dissipation channel is equal to or less than 1cm, so that the non-combustible insulating liquid can flow through the heat dissipation channels to form directional convection.
4. The liquid-immersed non-combustible power transformer according to claim 3, wherein the lower heat dissipation channel opening of the solid insulating filling member is horn-shaped.
5. The liquid-immersed non-combustible power transformer according to claim 1, wherein the solid insulating filler installed between the transformer body and the inner wall of the box body comprises an insulating paperboard and insulating support bars adhered to two sides of the insulating paperboard, and a heat dissipation channel for flowing of the non-combustible insulating liquid is formed at a space between two adjacent insulating support bars.
6. The liquid-immersed non-combustible power transformer according to claim 5, wherein a plurality of rows of round holes are arranged on the insulating paper board side by side in the range from about 1/3 th of the transformer body to the top of the transformer body, and the round holes are positioned at intervals between two adjacent insulating supporting strips.
7. The liquid-immersed non-combustible power transformer according to claim 5, wherein an opening is formed in the solid insulating filling member at a position corresponding to the radiator liquid inlet and outlet, and the diameter of the opening is the same as or slightly larger than that of the radiator liquid inlet and outlet so as to form a heat dissipation channel for flowing of the non-combustible insulating liquid.
8. The liquid-immersed non-combustible power transformer according to claim 1, wherein the class a insulation material is made of insulation paper, insulation cardboard, insulation wood block.
9. The liquid-immersed non-combustible power transformer according to claim 1, wherein the radiator is mounted on the outer walls of the long edges of the two sides of the tank body and is connected with the tank body through a liquid inlet and a liquid outlet; or the radiator and the box body are separately installed, and the horizontal height of the radiator is not lower than that of the box body.
10. The liquid-immersed non-combustible power transformer according to claim 1, wherein the condenser is mounted on the top of the tank body, and an air inlet pipe of the condenser is connected with one end of a side wall of the condenser and the other end of the air inlet pipe is connected with the top of the tank body; one end of a liquid return pipeline of the condenser is connected with the bottom of the condenser, and the other end of the liquid return pipeline is connected with the bottom of the box body or a position close to the bottom on the side wall of the box body.
11. The liquid-immersed non-combustible power transformer according to claim 1, wherein a mechanical pressure relief valve and a positive arch burst diaphragm are arranged on the top of the tank body, and are matched to form a pressure relief system in a diaphragm-valve combination mode.
12. The liquid-immersed noncombustible power transformer according to claim 1, wherein the voltage level is 35kV, 66kV, 110kV, 220 kV.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114725802A (en) * | 2022-05-24 | 2022-07-08 | 深圳市奥电高压电气有限公司 | Urban outdoor power distribution device |
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| CN201259816Y (en) * | 2008-04-14 | 2009-06-17 | 中山大学 | Dry transformer having gas-liquid dual phase heat radiation loop |
| CN202120729U (en) * | 2011-06-24 | 2012-01-18 | 武汉振源电力设备有限公司 | Amorphous alloy transformer structure |
| CN104240908A (en) * | 2014-09-10 | 2014-12-24 | 深圳市奥电高压电气有限公司 | Evaporative cooling power transformer |
| CN205487645U (en) * | 2016-01-18 | 2016-08-17 | 沈阳变压器研究院股份有限公司 | 110kV environment -friendly high ignition point vegetable oil transformer |
| CN112885574A (en) * | 2021-01-19 | 2021-06-01 | 深圳市奥电高压电气有限公司 | Evaporative cooling underground transformer |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114725802A (en) * | 2022-05-24 | 2022-07-08 | 深圳市奥电高压电气有限公司 | Urban outdoor power distribution device |
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