CN107705961B - vegetable oil power transformer - Google Patents
vegetable oil power transformer Download PDFInfo
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- CN107705961B CN107705961B CN201710996780.3A CN201710996780A CN107705961B CN 107705961 B CN107705961 B CN 107705961B CN 201710996780 A CN201710996780 A CN 201710996780A CN 107705961 B CN107705961 B CN 107705961B
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- transformer
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- 235000015112 vegetable and seed oil Nutrition 0.000 title claims abstract description 96
- 239000008158 vegetable oil Substances 0.000 title claims abstract description 96
- 239000003921 oil Substances 0.000 claims abstract description 236
- 235000019198 oils Nutrition 0.000 claims abstract description 236
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 38
- 235000012771 pancakes Nutrition 0.000 claims description 21
- 238000001816 cooling Methods 0.000 claims description 9
- 239000011810 insulating material Substances 0.000 claims description 6
- 125000006850 spacer group Chemical group 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 24
- 230000017525 heat dissipation Effects 0.000 abstract description 19
- 238000013461 design Methods 0.000 description 11
- 229910052500 inorganic mineral Inorganic materials 0.000 description 8
- 239000011707 mineral Substances 0.000 description 8
- 229910052742 iron Inorganic materials 0.000 description 7
- 235000013311 vegetables Nutrition 0.000 description 6
- 239000000123 paper Substances 0.000 description 5
- 238000004804 winding Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 3
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910000976 Electrical steel Inorganic materials 0.000 description 2
- 241000196324 Embryophyta Species 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 235000010446 mineral oil Nutrition 0.000 description 2
- 239000002480 mineral oil Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000003566 sealing material Substances 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 235000010469 Glycine max Nutrition 0.000 description 1
- 244000068988 Glycine max Species 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000005194 fractionation Methods 0.000 description 1
- 238000003306 harvesting Methods 0.000 description 1
- 238000003973 irrigation Methods 0.000 description 1
- 230000002262 irrigation Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 239000011087 paperboard Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 235000012424 soybean oil Nutrition 0.000 description 1
- 239000003549 soybean oil Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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
- H01F27/125—Cooling by synthetic insulating and incombustible liquid
-
- 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
-
- 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
-
- 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
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/2876—Cooling
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transformer Cooling (AREA)
Abstract
The invention provides a vegetable oil power transformer. The vegetable oil power transformer. The invention provides a vegetable oil power transformer, comprising: the oil tank, the cake-type coil and the iron core are arranged in the oil tank, and vegetable oil is filled in the oil tank; the cake-type coil is provided with a plurality of layers of transverse oil ducts for the circulation of vegetable oil; the height of the middle oil duct arranged in the middle is a first size value, and the heights of the rest oil ducts are fifth size values; the first size value is greater than the fifth size value, and the second size value, the third size value, and the fourth size value are all less than the first size value and greater than or equal to the fifth size value. According to the vegetable oil power transformer, the oil passage through which vegetable oil flows is specially designed, the heights of the middle oil passage, the end oil passage, the first oil passage and the second oil passage are increased, the problem of high viscosity of vegetable oil is solved, the vegetable oil can flow more conveniently, the overall heat dissipation effect of the transformer is ensured, and the overload capacity of the transformer is improved.
Description
Technical Field
The invention relates to the technical field of power equipment, in particular to a vegetable oil power transformer.
Background
At present, the utilization rate of the transformer is very low because most of the time in the rural area in one year is in a light load state; however, in spring festival and rural irrigation and harvesting period, rural electricity consumption condition may become several times of the previous condition, and most transformers in rural areas are in overload operation in a short time, so that the current situation is extremely easy to cause the rise of the operation temperature of the transformers, the burning of the transformers is caused, power failure accidents are caused, and the life of residents and the production of enterprises are also affected to a certain extent.
At present, a conventional 35kV power transformer generally adopts mineral insulating oil, which is an insulating oil obtained by petroleum fractionation and refining, and has low price and good electrical performance; the height of each layer of oil duct arranged in the existing transformer is designed to be 3mm in order to reduce the oil pressure in the transformer while ensuring the cooling effect; however, since the heat resistance grade of mineral insulating oil is low, accidents are easily caused when the load of the power transformer is increased, even when the power transformer is overloaded.
The plant insulating oil is used as a high ignition point oil, and various plant margin oils are currently marketed and sold in Japan and European and American countries, and the oil products have good electrical performance, are fireproof and high temperature resistant, are easy to degrade in nature, and more meet the technological requirements and ecological requirements of future transformers. However, after the vegetable insulating oil is used as the insulating liquid of the transformer, the kinematic viscosity is higher, the cooling performance is weaker than that of a mineral oil transformer, and the problem of overhigh temperature of the hottest point in the partial area of the internal winding of the transformer is easy to occur
Disclosure of Invention
In view of the above, the invention provides a vegetable oil power transformer, which aims to solve the problem of overhigh temperature in the existing vegetable oil transformer.
The invention provides a vegetable oil power transformer, which comprises: the device comprises an oil tank, a pancake coil and an iron core, wherein the pancake coil and the iron core are arranged in the oil tank, and vegetable oil used for insulating and cooling the pancake coil is filled in the oil tank; a plurality of layers of transverse oil channels for the vegetable oil to circulate are arranged in the cake-type coil, and the transverse oil channels and the axis of the iron core form an included angle; the heights of the middle oil ducts arranged in the middle are first size values, the heights of the first oil ducts on two sides of the middle oil duct are second size values, and the heights of the end oil ducts arranged on two ends are third size values; the heights of a plurality of second oil channels above the first oil channel at the uppermost layer and closest to the first oil channel, and a plurality of third oil channels below the first oil channel at the lowermost layer and closest to the first oil channel are fourth size values; the heights of the rest oil channels are fifth size values; the first size value is greater than the fifth size value, and the second, third, and fourth size values are all less than the first size value and greater than or equal to the fifth size value.
Further, in the vegetable oil power transformer, the fourth size value is smaller than or equal to the second size value.
Further, in the vegetable oil power transformer, the third dimension value is equal to the fourth dimension value.
Further, the above vegetable oil power transformer, the pancake coil includes: the low-voltage coil and the high-voltage coil are sleeved outside the iron core in sequence; gaps are arranged in the low-voltage coil and the high-voltage coil in one-to-one correspondence, and the corresponding gaps are communicated to form the transverse oil duct through which the vegetable oil circulates.
Further, in the vegetable oil power transformer, the height of the part of the intermediate oil duct arranged in the low-voltage coil is smaller than the height of the part arranged in the high-voltage coil; the height of the part of the first oil duct arranged in the low-voltage coil is larger than that of the part arranged in the high-voltage coil.
Further, in the vegetable oil power transformer, a preset distance is reserved between the top of the iron core and the top end of the oil tank.
Further, in the vegetable oil power transformer, the stay and/or the cushion block arranged on the upper part of the oil duct are made of high-temperature resistant insulating materials.
Further, in the vegetable oil power transformer, an oil temperature measuring structure is arranged at the top of the oil tank and is used for measuring the temperature at the top of the oil tank through the oil temperature measuring device.
Further, in the vegetable oil power transformer, the insulating paper wrapped on the outer wall of the lead of the transformer is high-temperature-resistant insulating paper.
Compared with mineral insulating oil adopted in the prior art, the vegetable oil flowing in the oil tank of the vegetable oil power transformer has high ignition point and flash point and stronger heat resistance, so that the cooling and insulating effects of the vegetable oil power transformer are further improved, the overload capacity of the transformer is further improved, and the fireproof performance of the transformer is also improved; through carrying out special design to the oil duct that circulates there is vegetable oil, increase the size design to the height of middle oil duct, tip oil duct, first oil duct and second oil duct to increase the height of relevant oil duct, and then overcome the problem that vegetable oil viscosity is big in order to make vegetable oil's circulation more convenient, thereby guaranteed the holistic radiating effect of transformer, improved the overload capacity of this transformer, and then enlarged the region of use of this transformer.
In particular, according to the vegetable oil power transformer provided by the invention, through the design that the first size value is larger than the fifth size value, the size design is increased to ensure the height of the middle oil duct, so that the circulation of vegetable oil in the middle oil duct with poor heat dissipation effect is improved, the heat dissipation effect of the middle oil duct is further improved, the phenomenon of overhigh oil temperature is avoided, and the overload capacity of the transformer is further improved.
Furthermore, according to the vegetable oil power transformer provided by the invention, the second size value, the third size value and the fourth size value are smaller than the first size value and larger than or equal to the fifth size value, so that the overall heat dissipation effect of the transformer is ensured under the condition of maximally reducing the height of a transformer coil, and the phenomenon of overheat of the oil temperature in the transformer is further avoided.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:
fig. 1 is a schematic structural diagram of a vegetable oil power transformer according to an embodiment of the present invention;
fig. 2 is a top view of a pancake coil according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a high-voltage coil according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a low-voltage coil according to an embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other. The invention will be described in detail below with reference to the drawings in connection with embodiments.
Referring to fig. 1, a schematic structural diagram of a vegetable oil power transformer according to an embodiment of the present invention includes: the device comprises an oil tank 1, a pancake coil 2 and an iron core 3; wherein, cake coil 2 and iron core 3 all set up in oil tank 1, and oil tank 1 intussuseption is filled with the vegetable oil that is used for insulating and cooling cake coil 2, is provided with the transverse oil duct (not shown in the figure) that a plurality of layers supplies vegetable oil to circulate in the cake coil 2, and it is the contained angle setting with the axis (vertical direction as shown in fig. 1) of iron core 3.
Specifically, as is well known to those skilled in the art, the oil tank 1 is provided with a containing cavity for containing insulating oil, the insulating oil is vegetable oil, and according to the comparison of the vegetable oil and mineral oil in table 1, the vegetable oil has high ignition point and flash point, and has stronger heat resistance, so as to further improve the cooling and insulating effects and further improve the overload capacity of the transformer; in order to further improve the heat resistance, the vegetable oil is soybean oil; the iron core 3 is arranged in the oil tank 1 so as to form a magnetic circuit part of the transformer, thereby realizing the transmission and conversion of electromagnetic energy; in order to reduce the influence of high-temperature operation on each component at the top of the oil tank 1 and the sealing material thereof, the oil tank 1 is designed to be enlarged, and the top of the iron core 3 and the top of the oil tank 1 are separated by a preset distance L1, namely the distance between the top of the upper iron yoke 31 and the top of the oil tank 1 is larger than the corresponding distance of mineral insulating oil in the prior art, so that the influence of the excessive temperature of the components arranged at the top of the oil tank 1 on the operation effect of the components caused by the excessive temperature of the oil is avoided; the iron core 3 comprises a core column, an upper iron yoke 31 and a lower iron yoke 32, wherein the core column is formed by sequentially stacking a plurality of silicon steel sheets, and the pancake coil 2 is wound on the core column of the iron core 3 so as to realize the transformation of electromagnetic energy; the upper iron yoke 31 and the lower iron yoke 32 are respectively disposed above and below the stem for forming a closed magnetic circuit to transmit electromagnetic energy; the pancake coil 2 is a pancake winding structure and is formed by sequentially stacking a plurality of coil cakes; a reserved gap is formed between any two adjacent coil cakes to form a transverse oil passage for the circulation of vegetable oil, so that the transverse oil passage and the axis of the iron core 3 form an included angle; in order to reduce the height of the transformer, preferably, the transverse oil duct is horizontally arranged, that is, the transverse oil duct is vertically arranged with the axis of the iron core 3, so that the oil pressure of vegetable oil in the oil tank is reduced, and the usage amount of the vegetable oil in the oil tank is reduced.
As is well known to those skilled in the art, pancake coil 2 of the transformer is connected to an external circuit by lead 4; in order to prevent the use of the lead wire 4 from being influenced by the excessive oil temperature, preferably, the lead wire 4 is made of annealed copper wires, the connection part of the lead wire 4 and the pancake coil is welded by adopting a high-frequency welding process, so that no burrs are ensured, the quality of a welding seam is ensured, and the running risk coefficient of the transformer can be reduced; in order to further ensure the normal operation of the lead 4, the lead 4 is sleeved with a sleeve; in order to improve the heat resistance degree, the insulating paper coated on the outer wall of the lead 4 is high-temperature resistant insulating paper; in order to avoid too high oil temperature in the oil tank 1 again, an oil temperature measuring structure is arranged at the top of the oil tank 1 and is used for measuring the oil temperature at the top of the oil tank 1 through an oil temperature measuring device, and a sensor and the like can be arranged at the oil temperature measuring structure so as to measure the oil temperature in the oil tank 1, so that the oil temperature in the oil tank 1 can be controlled conveniently; in order to avoid the situation that the oil tank 1 cannot be timely replenished when in an oil shortage state, the oil tank 1 is provided with an oil storage tank for storing and replenishing the oil for the oil tank 1 so as to timely treat the oil tank 1 when the oil is short of or is rich in oil; in order to avoid excessive pressure in the oil tank 1, the oil tank 1 is provided with a pressure release valve; in order to avoid outflow of vegetable oil in the tank 1, a pressure relief valve is preferably provided at the top of the tank 1.
TABLE 1 comparison of essential Performance parameters of vegetable oils and mineral insulating oils
With continued reference to fig. 1, a plurality of struts and/or pads for supporting the oil passage gap are disposed within the oil passage.
Specifically, the coil cakes are connected through stays and/or cushion blocks so as to be convenient for overhead each coil cake, and further provide an oil flow channel for the circulation and heat dissipation of the transformer insulating medium, namely vegetable oil; because the temperature of the vegetable oil in the oil duct arranged at the upper part in the oil duct is higher than the temperature in the oil duct arranged at the lower part, the stay and/or the cushion block arranged at the upper part of the oil duct are made of high-temperature-resistant insulating materials, and the stay and/or the cushion block arranged at the lower part of the oil duct are made of conventional insulating materials, so that the operation of the pancake coil 2 is prevented from being influenced by the excessive temperature of the vegetable oil at the upper part of the pancake coil 2.
The height of the middle oil duct arranged in the middle is a first size value, the heights of a plurality of first oil ducts on two sides of the middle oil duct are second size values, the heights of a plurality of end oil ducts arranged at two ends are third size values, the heights of a plurality of second oil ducts above the first oil duct at the uppermost layer and closest to the first oil duct and a plurality of third oil ducts below the first oil duct at the lowermost layer and closest to the first oil duct are fourth size values, and the heights of the rest oil ducts are fifth size values, wherein the first size value is larger than the fifth size value, and one or more of the second size value, the third size value and the fourth size value is smaller than the first size value and larger than or equal to the fifth size value.
Specifically, as is well known to those skilled in the art, the height of each layer of oil passage in the existing transformer using mineral insulating oil is 3mm; in order to prevent the height of the transformer using vegetable oil from being excessively high, preferably, the fifth dimension value is 3mm, so as to avoid excessively high oil pressure in the transformer and thus prevent waste of vegetable oil; the vegetable insulating oil used in the invention has higher kinematic viscosity, so that the heat dissipation requirement of the transformer is met by ensuring the mobility of the vegetable insulating oil in the transformer, the size of an oil flow channel is relatively increased, and the oil duct in the transformer is specially designed; the vegetable oil in the middle oil duct has the worst heat dissipation effect, so that the first size value is larger than the fifth size value, and the second size value and the fourth size value are larger than or equal to the fifth size value, so that the height of the oil duct is enlarged, the flow of the vegetable oil is promoted, and the overhigh oil temperature in the transformer is avoided; in order to avoid that the vegetable oil flowing in the end oil passage is too high in temperature to cause the aging of the parts adjacent to the end oil passage so as to increase the third dimension value, the third dimension value is larger than the fifth dimension value. In order to avoid the transformer having too high a height, the second size value, the third size value and the fourth size value are smaller than the first size value and larger than or equal to the fifth size value.
Obviously, compared with mineral insulating oil adopted in the prior art, the vegetable oil power transformer provided by the embodiment has the advantages that the vegetable oil flowing in the oil tank has high ignition point and flash point and stronger heat resistance, so that the cooling and insulating effects of the vegetable oil power transformer are further improved, the overload capacity of the transformer is further improved, and the fireproof performance of the transformer is also improved; through carrying out special design to the oil duct that circulates there is vegetable oil, increase the size design to the height of middle oil duct, tip oil duct, first oil duct and second oil duct to increase the height of relevant oil duct, and then overcome the problem that vegetable oil viscosity is big in order to make vegetable oil's circulation more convenient, thereby guaranteed the holistic radiating effect of transformer, improved the overload capacity of this transformer, and then enlarged the region of use of this transformer.
Especially, the vegetable oil power transformer provided by the embodiment ensures that the height of the middle oil duct is increased by the design that the first size value is larger than the fifth size value so as to improve the circulation of vegetable oil in the middle oil duct with poor heat dissipation effect and further improve the heat dissipation effect of the middle oil duct, thereby avoiding the phenomenon of overhigh oil temperature and further improving the overload capacity of the transformer.
Further, in the vegetable oil power transformer provided in this embodiment, the second size value, the third size value and the fourth size value are smaller than the first size value and larger than or equal to the fifth size value, so that the overall heat dissipation effect of the transformer is ensured under the condition of maximally reducing the height of the transformer coil, and the phenomenon that the oil temperature in the transformer is overheated is further avoided.
In order to facilitate the processing and heat dissipation of the transformer, the fourth dimension value is preferably smaller than or equal to the second dimension value.
Specifically, the thickness dimensions of the first oil duct, the second oil duct, the third oil duct and other oil ducts which extend from the middle oil duct to two sides can be sequentially reduced, so that the heat dissipation effect of the vegetable oil flowing in the oil duct at the middle position is improved, and the heat dissipation effect and the overload capacity of the transformer are integrally improved; in order to further reduce the height of the transformer, it is preferable that the third dimension value is equal to the fourth dimension value, not only ensuring the dimension of increasing the thickness of the end oil passage, but also reducing the height of the transformer so as to avoid the waste of vegetable oil thereof.
It is obviously understood that the thickness of the third oil duct is smaller than that of the second oil duct in this embodiment, so as to improve the heat dissipation effect of the oil duct disposed at the middle position, and avoid the transformer from being too high, so as to integrally improve the heat dissipation effect and overload capacity of the transformer, and avoid the waste of vegetable oil in the transformer.
Referring to fig. 2 to 4, the pancake coil 2 includes: a low-voltage coil 21 and a high-voltage coil 22 which are sequentially sleeved outside the iron core 3; wherein, the low-voltage coil 21 and the high-voltage coil 22 are provided with gaps in one-to-one correspondence, and the corresponding gaps are communicated to form a transverse oil duct for the circulation of vegetable oil.
Specifically, the low-voltage coil 21 and the high-voltage coil 22 are each of pancake winding structures; the low-voltage coil 21 and the high-voltage coil 22 are respectively formed by sequentially stacking a plurality of corresponding low-voltage coil cakes 211 and high-voltage coil cakes 221; a low-pressure gap 212 is arranged between any two adjacent low-pressure coil cakes 211 along the axis of the iron core 3, a high-pressure gap 222 is arranged between any two adjacent high-pressure coil cakes 221, and the low-pressure gap 212 and the high-pressure gap 222 are communicated so as to form a transverse oil duct for circulating vegetable oil; according to the operation conditions of the low-voltage coil 21 and the high-voltage coil 22, preferably, the height of the part of the middle oil duct arranged in the low-voltage coil 21 is smaller than the height of the part arranged in the high-voltage coil 22, that is, the height L211 of the middle low-voltage gap arranged at the most middle position is smaller than the height L221 of the middle high-voltage gap arranged at the most middle position, that is, L211< L221, so that the vegetable oil temperature in the low-voltage coil 21 and the high-voltage coil 22 is balanced to avoid local overheating of the cake-type coil 2; the height of the portion of the first oil passage disposed in the low-voltage coil 21 is greater than the height of the portion disposed in the high-voltage coil 22, that is, the height L212 of the plurality of first low-voltage gaps disposed on the upper and lower sides of the middle low-voltage gap disposed at the most middle position is greater than the height L222 of the plurality of first high-voltage gaps disposed on the upper and lower sides of the middle high-voltage gap disposed at the most middle position, that is, L212> L222.
It is obvious that the pancake coil 2 provided in this embodiment improves the application range of the transformer by setting the low-voltage coil 21 and the high-voltage coil 22 so as to increase the range of voltage variation to meet the actual requirement.
The vegetable oil power transformer provided by the embodiment of the invention is described in more detail below:
as shown in fig. 1 to 4, the apparatus includes: the device comprises an oil tank 1, a pancake coil 2 and an iron core 3; the transformer body and the transformer insulating medium are contained, meanwhile, a top layer oil temperature measuring hole is arranged on the oil tank, so that the temperature of the oil top layer can be measured conveniently during operation, meanwhile, a pressure release valve and an oil storage cabinet are arranged, and hanging rings are arranged at four corners of the top of the oil tank, so that the lifting is convenient; in order to reduce the influence of high-temperature operation on all parts at the top of the oil tank and sealing materials thereof, the oil tank is designed to be enlarged, and the distance between the tank cover and the top end of the transformer body is set to be 30cm; the oil tank 1 is filled with a transformer insulating medium, and in order to improve the heat resistance of the transformer, the transformer insulating medium in the embodiment adopts soybean-based vegetable insulating oil, the ignition point of the vegetable insulating oil is up to 360 ℃, and meanwhile, the good insulating property is maintained; the pancake coil 2 comprises a high-voltage coil 22 and a low-voltage coil 21, which are wound by copper wires, the winding type is a pancake continuous winding, the voltage of the high-voltage coil is 35kV, the voltage of the low-voltage coil is 400V, the high-voltage coil 22 is connected with a 35kV power transmission line through a high-voltage sleeve, and the low-voltage coil 21 is connected with the 400V power transmission line through a low-voltage sleeve. Because the kinematic viscosity of the vegetable insulating oil is increased, when the transformer coil is designed and manufactured, special design is adopted for part of oil channels: the high-voltage coil 22 and the low-voltage coil 21 are respectively formed by stacking corresponding 46 cake coil cakes, and are arranged according to the sequence numbers of 1-46 from bottom to top; supporting and erecting each wire cake by using a cushion block to provide an oil flow channel for the circulation and heat dissipation of an insulating medium of the transformer, wherein each cake coil is respectively provided with 12 cushion blocks at intervals of 30 degrees; the middle oil passage (between the 22 nd cake and the 23 rd cake) of the high-voltage coil 22 is designed to be 10mm, the upper and lower middle layers of oil passages are designed to be 4mm (between the 20 th cake, the 21 nd cake and between the 23 rd cake, the 24 th cake and the 25 th cake), the oil passages of the front four cakes at the head end and the tail end of the high-voltage coil 22 are designed to be 4mm (between the 1 st cake, the 2 nd cake, the 3 nd cake and between the 43 rd cake, the 44 th cake, the 45 th cake and the 46 th cake), and other oil passages are designed to be 3mm; the gap between the oil channels in the high-voltage coil 22 is supported by a cushion block combination, the oil channel with the height of 3mm is supported by two cushion block combinations with the height of 1.5mm, the width of 40mm and the length of 74.5mm, the oil channel with the length of 4mm is supported by two cushion block combinations with the height of 2mm, the width of 40mm and the length of 74.5mm, the oil channel with the length of 10mm is supported by five cushion block combinations with the height of 2mm, the width of 40mm and the length of 74.5mm, the cushion blocks in the coils between 22 th and 46 th cakes are made of high heat-resistant grade materials, and the cushion blocks between 1 st and 22 nd cakes are made of conventional insulating materials; the middle oil passage (between the 22 nd cake and the 23 rd cake) of the low-voltage coil 21 is designed to be 8mm, the upper and lower layers of oil passages in the middle are designed to be 5mm (between the 20 th cake, the 21 st cake, the 22 nd cake, the 23 rd cake, the 24 th cake and the 25 th cake), the upper and lower 3 oil passages are designed to be 4mm (between the 17 th cake, the 18 th cake, the 19 th cake, the 20 th cake, the 25 th cake, the 26 th cake, the 27 th cake and the 28 th cake), the oil passages of the front four cakes at the head end and the tail end of the low-voltage coil 21 are designed to be 4mm (between the 1 st cake, the 2 nd cake, the 3 rd cake, the 44 th cake, the 45 th cake and the 46 th cake), and the other oil passages are all designed to be 3mm; and (3) designing a cushion block: the 3mm oil duct is supported by two cushion block combinations with the height of 1.5mm, the width of 30mm and the length of 48.5mm, the 4mm oil duct is supported by two cushion block combinations with the height of 2mm, the width of 30mm and the length of 48.5mm, the 5mm oil duct is supported by 1 cushion block combination with the height of 2mm, the width of 40mm and the length of 48.5mm, and two cushion block combinations with the height of 1.5mm, the width of 30mm and the length of 48.5mm, the 8mm oil duct is supported by 4 cushion block combinations with the height of 2mm, the width of 40mm and the length of 48.5mm, cushion blocks in coils between 22 th and 46 th cakes are made of high heat-resistant grade materials, and cushion blocks between 1 st and 22 nd cakes are made of conventional insulating materials; the iron core 3 comprises a core column, an upper iron yoke 31 and a lower iron yoke 32, wherein the core column is formed by stacking silicon steel sheets, and when a coil at one side of the transformer is electrified, magnetic flux is generated in the iron core to provide a magnetic loop for the transformer; the core column is sleeved with a low-voltage coil 21 and a high-voltage coil 22 in sequence from inside to outside, the coils are isolated by using a purse-screen paperboard and are fixed by using a stay, and the stay is made of a high-temperature resistant material; the high temperature resistant insulating paper is wrapped outside the lead 4, the end part is welded with the end part of the coil, and the lead 4 sub-sleeve penetrates out to facilitate connection of an external circuit.
In summary, in the vegetable oil power transformer provided in this embodiment, compared with the mineral insulating oil adopted in the prior art, the vegetable oil flowing in the oil tank has high ignition point and flash point, and has stronger heat resistance, so as to further improve the cooling and insulating effects thereof, further improve the overload capacity of the transformer, and improve the fireproof performance of the transformer at the same time; through carrying out special design to the oil duct that circulates there is vegetable oil, increase the size design to the height of middle oil duct, tip oil duct, first oil duct and second oil duct to increase the height of relevant oil duct, and then overcome the problem that vegetable oil viscosity is big in order to make vegetable oil's circulation more convenient, thereby guaranteed the holistic radiating effect of transformer, improved the overload capacity of this transformer, and then enlarged the region of use of this transformer.
Especially, the vegetable oil power transformer provided by the embodiment ensures that the height of the middle oil duct is increased by the design that the first size value is larger than the fifth size value so as to improve the circulation of vegetable oil in the middle oil duct with poor heat dissipation effect and further improve the heat dissipation effect of the middle oil duct, thereby avoiding the phenomenon of overhigh oil temperature and further improving the overload capacity of the transformer.
Further, in the vegetable oil power transformer provided in this embodiment, the second size value, the third size value and the fourth size value are smaller than the first size value and larger than or equal to the fifth size value, so that the overall heat dissipation effect of the transformer is ensured under the condition of maximally reducing the height of the transformer coil, and the phenomenon that the oil temperature in the transformer is overheated is further avoided.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (10)
1. A vegetable oil power transformer, comprising: oil tank (1) and cake coil (2) and iron core (3) that set up in oil tank (1), its characterized in that:
the oil tank (1) is filled with vegetable oil for insulating and cooling the pancake coil (2); the oil tank is provided with a pressure release valve;
a plurality of layers of transverse oil channels for the vegetable oil to circulate are arranged in the cake-shaped coil (2), and the transverse oil channels and the axis of the iron core (3) form an included angle;
the heights of the middle oil ducts arranged in the middle are first size values, the heights of the first oil ducts on two sides of the middle oil duct are second size values, and the heights of the end oil ducts arranged on two ends are third size values;
the heights of a plurality of second oil channels above the first oil channel at the uppermost layer and closest to the first oil channel, and a plurality of third oil channels below the first oil channel at the lowermost layer and closest to the first oil channel are fourth size values;
the heights of the rest oil channels are fifth size values;
the first size value is greater than the fifth size value, and the second, third, and fourth size values are all less than the first size value and greater than or equal to the fifth size value.
2. The vegetable oil power transformer of claim 1, wherein the vegetable oil power transformer comprises a transformer body,
the fourth size value is less than or equal to the second size value.
3. The vegetable oil power transformer of claim 2, wherein the vegetable oil power transformer comprises a transformer body,
the third dimension value is equal to the fourth dimension value.
4. A vegetable oil power transformer according to any one of claims 1 to 3, characterized in that the pancake coil (2) comprises: a low-voltage coil (21) and a high-voltage coil (22) which are sequentially sleeved outside the iron core (3); wherein,,
gaps are arranged in the low-voltage coil (21) and the high-voltage coil (22) in one-to-one correspondence, and the corresponding gaps are communicated to form the transverse oil duct through which the vegetable oil circulates.
5. The vegetable oil power transformer of claim 4, wherein the vegetable oil power transformer comprises a transformer body,
the height of the part of the middle oil duct arranged in the low-voltage coil (21) is smaller than the height of the part arranged in the high-voltage coil (22);
the height of the portion of the first oil passage disposed in the low-voltage coil (21) is greater than the height of the portion disposed in the high-voltage coil (22).
6. A vegetable oil power transformer according to any one of claims 1 to 3, characterized in that the top of the iron core (3) is spaced a preset distance from the top end of the oil tank (1).
7. A vegetable oil power transformer according to any one of claims 1 to 3, wherein a number of stays and/or pads for supporting the oil passage gap are provided in the oil passage.
8. The vegetable oil power transformer according to claim 7, wherein the stay and/or the spacer provided at the upper portion of the oil passage is made of a high-temperature resistant insulating material.
9. A vegetable oil power transformer according to any one of claim 1 to 3,
the top of the oil tank (1) is provided with an oil temperature measuring structure which is used for measuring the temperature of the top of the oil tank (1) through the oil temperature measuring device.
10. A vegetable oil power transformer according to any one of claims 1 to 3, characterized in that the insulating paper covered by the outer wall of the lead (4) of the transformer is a high temperature resistant insulating paper.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710996780.3A CN107705961B (en) | 2017-10-20 | 2017-10-20 | vegetable oil power transformer |
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| CN201710996780.3A CN107705961B (en) | 2017-10-20 | 2017-10-20 | vegetable oil power transformer |
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| JP7310548B2 (en) * | 2019-10-31 | 2023-07-19 | 株式会社オートネットワーク技術研究所 | Arrangement structure of electric wire |
| CN113314314B (en) * | 2021-05-19 | 2023-05-26 | 辽宁华冶集团发展有限公司 | High-reliability phase-shifting rectifier transformer of frequency converter |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2514471Y (en) * | 2001-12-21 | 2002-10-02 | 沈阳沈变中型变压器有限责任公司 | Cake-type winding structure |
| CN2650304Y (en) * | 2003-07-31 | 2004-10-20 | 浙江三变科技股份有限公司 | High-voltage winding structure for transformer |
| CN204010969U (en) * | 2014-07-04 | 2014-12-10 | 宁波智天档案管理咨询有限公司 | Distribution transformer |
| CN207624497U (en) * | 2017-10-20 | 2018-07-17 | 中国电力科学研究院有限公司 | Vegetable oil power transformer |
-
2017
- 2017-10-20 CN CN201710996780.3A patent/CN107705961B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2514471Y (en) * | 2001-12-21 | 2002-10-02 | 沈阳沈变中型变压器有限责任公司 | Cake-type winding structure |
| CN2650304Y (en) * | 2003-07-31 | 2004-10-20 | 浙江三变科技股份有限公司 | High-voltage winding structure for transformer |
| CN204010969U (en) * | 2014-07-04 | 2014-12-10 | 宁波智天档案管理咨询有限公司 | Distribution transformer |
| CN207624497U (en) * | 2017-10-20 | 2018-07-17 | 中国电力科学研究院有限公司 | Vegetable oil power transformer |
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