CN112103042A - High overload capacity oil-immersed distribution transformer - Google Patents
High overload capacity oil-immersed distribution transformer Download PDFInfo
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- CN112103042A CN112103042A CN202011149003.3A CN202011149003A CN112103042A CN 112103042 A CN112103042 A CN 112103042A CN 202011149003 A CN202011149003 A CN 202011149003A CN 112103042 A CN112103042 A CN 112103042A
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- oil
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- distribution transformer
- insulated wire
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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
- H01F27/12—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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Transformer Cooling (AREA)
Abstract
The invention discloses an oil-immersed distribution transformer with high overload capacity, which comprises an oil tank filled with cooling oil and a winding immersed in the cooling oil, wherein the winding comprises a low-voltage coil formed by spirally winding an insulated wire, a hollow oil duct is arranged in the insulated wire, the inlet of the hollow oil duct is connected with an oil discharge port of an oil pump arranged outside the oil tank, and the outlet of the hollow oil duct and the oil suction port of the oil pump are both communicated with the inside of the oil tank. According to the invention, the hollow oil duct directly communicated with the inside of the oil tank is additionally arranged in the insulated wire, so that the cooling oil in the tank body can enter the inside of the insulated wire, the contact area between the low-voltage coil and the cooling oil is increased, the internal and external heat dissipation of the low-voltage coil is realized, and the heat dissipation efficiency of the low-voltage coil is improved; the oil pump is used for conveying cooling oil to the interior of the hollow oil duct, and heat generated by local high temperature of the coil is taken away from the winding by forced cooling oil circulation, so that active heat dissipation is realized.
Description
Technical Field
The invention relates to the field of power equipment, in particular to an oil-immersed distribution transformer with high overload capacity.
Background
The distribution transformer is used as important energy conversion equipment of a power grid system, is directly connected with a power grid and each user of a terminal, and the performance of the distribution transformer is directly related to whether the power distribution network can safely and stably operate. At present, the rural power grid power load in China has obvious seasonal characteristics, namely the power load is in a light-load running state in most of the whole year, the capacity utilization rate of a transformer is usually 10-30%, the common overload problem exists in high-temperature seasons in summer and short time in spring festival, the phenomena of rapid temperature rise and accelerated insulation aging of a winding and insulation oil of a distribution transformer are easily caused, and the transformer can be burnt out due to overheating in the most serious condition. If avoid short-term overload through the mode that increases large capacity and investment, then can increase the extravagant condition of the long-time low load factor operation of transformer, and the manufacturing cost, the operation maintenance cost and the iron core power loss of large capacity transformer also can increase.
Therefore, aiming at the electricity utilization characteristics of rural areas in China, the distribution transformer with relatively small load capacity and high overload capacity has wide application prospect. Preliminary investigation shows that a considerable number of transformers in the distribution transformers in China run under light load for a long time, and the phenomenon of instantaneous high-rate overload running is common. The capacity of the transformer for coping with overload conditions is improved, the overload damage rate of the transformer can be reduced, and the operation capacity of a power distribution system is effectively improved. Therefore, the application of the oil-immersed distribution transformer with high overload capacity has important significance for guaranteeing the power supply reliability of the power distribution network.
The existing oil immersed distribution transformer with high overload capacity is characterized in that a plurality of oil passages which are axially arranged are additionally arranged between a high-voltage coil and a low-voltage coil of a winding, so that cooling oil in a box body can enter between the high-voltage coil and the low-voltage coil, and the inside and the outside of the winding are simultaneously radiated, so that the heat resistance grade and the heat radiation capacity of the coil are improved, for example, the oil immersed high overload distribution transformer disclosed in the Chinese patent with the publication number of CN205092129U and the oil immersed transformer disclosed in the Chinese patent with the publication number of CN 207474218U.
Through long-term use practice, the transformer only depends on oil to passively conduct heat, because the resistance of the oil is larger than that of water, the heat absorption and heat dissipation speed of the transformer is relatively slow, so that the heat conduction efficiency is low, the oil temperature around the coil is obviously higher than that of the oil at the wall of the box body, and the low-voltage coil is positioned at the inner side of the winding, can be added by heat emitted by the high-voltage coil besides self-heating, so that the aging speed of the coil is high, and even the risk of fire catching exists; the oil duct arranged along the axial direction is formed by enclosing the supporting strips arranged among the coils and the coils, the heat dissipation area is limited, the heat dissipation efficiency is low, and the purpose of rapid heat dissipation cannot be realized.
Disclosure of Invention
The invention aims to provide the high-overload-capacity oil-immersed distribution transformer with better heat dissipation capacity of the low-voltage coil aiming at the defects in the prior art.
The invention provides an oil-immersed distribution transformer with high overload capacity, which comprises an oil tank filled with cooling oil and a winding immersed in the cooling oil, wherein the winding comprises a low-voltage coil formed by spirally winding an insulated wire, a hollow oil duct is arranged in the insulated wire, the inlet of the hollow oil duct is connected with an oil discharge port of an oil pump arranged outside the oil tank, and the outlet of the hollow oil duct and the oil suction port of the oil pump are both communicated with the inside of the oil tank.
The inlet of the hollow oil duct is arranged higher than the upper annular surface of the low-voltage coil, and the outlet of the hollow oil duct is arranged lower than the lower annular surface of the low-voltage coil.
And an oil suction port of the oil pump is communicated with the bottom of the inner side of the oil tank.
The hollow oil duct is arranged along the axial direction of the insulated wire.
The hollow oil duct is arranged at the axis of the insulated wire.
The inlet and the outlet of the hollow oil duct are both arranged on the side wall of the insulated wire.
And only one of the winding and the oil pump is arranged.
The number of the windings is three, and the number of the oil pumps is only one.
The windings and the oil pump are respectively connected in a corresponding way in a one-to-one mode.
According to the invention, the hollow oil duct directly communicated with the inside of the oil tank is additionally arranged in the insulated wire, so that the cooling oil in the tank body can enter the inside of the insulated wire, the contact area between the low-voltage coil and the cooling oil is increased, the internal and external heat dissipation of the low-voltage coil is realized, and the heat dissipation efficiency of the low-voltage coil is improved; the oil pump is used for conveying cooling oil to the interior of the hollow oil duct, and the heat generated by local high temperature of the low-voltage coil during the operation of the transformer is taken away from the winding through forced cooling oil circulation, so that active heat dissipation is realized. The invention solves the heat dissipation problem from the transformer structure, prolongs the service life of the transformer, reduces overload damage of distribution transformer, reduces the increase of the capacity of the rural power grid distribution transformer and saves the investment cost.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic view of a partial cross-sectional enlarged structure of the low voltage coil in fig. 1.
The labels shown in the figures and the corresponding component names are:
1. an oil tank; 2. cooling oil; 3. a low-voltage coil; 4. a low voltage insulating sleeve; 5. an oil pump; 6. an oil discharge pipe; 7. an oil suction pipe; 31. an insulated wire; 32. a hollow oil passage; 33. an inlet; 34. an outlet; 51. an oil discharge port; 52. an oil suction opening.
Detailed Description
As can be seen from fig. 1 and fig. 2, the oil-immersed distribution transformer with high overload capacity of the present invention comprises an oil tank 1, an iron core column, a winding, a low-voltage insulating sleeve 4, an oil pump 5, an oil discharge pipe 6 and an oil suction pipe 7,
the oil tank 1 is a rectangular tank body formed by welding steel plates, cooling oil 2 is filled in the oil tank 1, an iron core column and a winding are immersed in the cooling oil 2, the winding is sleeved outside the iron core column and comprises a low-voltage coil 3 formed by spirally winding an insulated wire 31, two ends of the insulated wire 31 extend out of the annular surface of the low-voltage coil 3 and are arranged, a hollow oil duct 32 axially arranged along the insulated wire 31 is arranged at the axis of the insulated wire 31, an inlet 33 communicated with the hollow oil duct 32 is formed in the side wall of the insulated wire 31 above the annular surface of the low-voltage coil 3, and an outlet 34 communicated with the hollow oil duct 32 is formed in the side wall of the insulated wire 31 below the annular surface of the low-voltage coil 3;
the low-voltage insulating sleeve 4 is arranged at the top of the oil tank 1, and the low-voltage coil 3 is connected with the low-voltage insulating sleeve 4 through a lead;
the oil pump 5 is arranged outside the oil tank 1, one end of an oil discharge pipe 6 is connected with an oil discharge port 51 of the oil pump 5, one end of the oil discharge pipe penetrates through the side wall of the oil tank 1 to be connected with the inlet 33, the pipe body of the oil discharge pipe 6 is hermetically connected with the side wall of the oil tank 1 through sealant, one end of an oil suction pipe 7 is connected with an oil suction port 52 of the oil pump 5, one end of the oil suction pipe is hermetically connected with the wall of the oil tank 1 below the outlet 34, and the outlet 34 and.
When the invention is used, particularly in the high temperature season in summer and during the spring festival, and when the electric load is too high and high overload is easy to occur, the oil pump 5 is started, the oil pump 5 pumps the cooling oil 2 with lower oil temperature at the bottom inside the oil tank 1 into the hollow oil passage 32 of the insulated conducting wire 31 through the inlet 33, and the cooling oil 2 with higher oil temperature in the hollow oil passage 32 flows out from the outlet 34 under the action of pressure to force the cooling oil 2 to actively circulate, so that heat generated by local high temperature of the iron core column and the low-voltage coil 3 when the transformer operates is brought to the wall of the oil tank for heat dissipation.
As can be seen from fig. 1, the present invention is a three-phase transformer, three core legs and three corresponding windings are enclosed in an oil tank 1, only one oil pump 5 is provided, and an oil discharge pipe 6 is connected with an inlet 33 of each winding through three branch pipes in the oil tank 1.
In the invention, the winding and the oil pump 5 can also adopt a one-to-one arrangement mode, when the invention is a single-phase transformer, the winding, the oil pump 5 and the oil discharge pipe 6 are only one; when the invention is a three-phase transformer, the number of the winding, the oil pump 5 and the oil discharge pipe 6 is three.
Claims (9)
1. A high overload capacity oil-immersed distribution transformer, includes oil tank (1) that fills with cooling oil (2) and soaks in the winding in the cooling oil, the winding includes low-voltage coil (3) that is formed by insulated wire (31) spiral winding, its characterized in that: a hollow oil channel (32) is arranged in the insulated wire, an inlet (33) of the hollow oil channel is connected with an oil discharge port (51) of an oil pump (5) arranged outside the oil tank, and an outlet (34) of the hollow oil channel and an oil suction port (52) of the oil pump are communicated with the inside of the oil tank.
2. The high overload capability oil filled distribution transformer of claim 1, wherein: the inlet of the hollow oil duct is arranged higher than the upper annular surface of the low-voltage coil, and the outlet of the hollow oil duct is arranged lower than the lower annular surface of the low-voltage coil.
3. The high overload capability oil filled distribution transformer of claim 2, wherein: and an oil suction port of the oil pump is communicated with the bottom of the inner side of the oil tank.
4. The high overload capability oil filled distribution transformer of claim 1, wherein: the hollow oil duct is arranged along the axial direction of the insulated wire.
5. The high overload capability oil filled distribution transformer of claim 4, wherein: the hollow oil duct is arranged at the axis of the insulated wire.
6. The high overload capability oil filled distribution transformer of claim 1, wherein: the inlet and the outlet of the hollow oil duct are both arranged on the side wall of the insulated wire.
7. The high overload capacity oil filled distribution transformer of any one of claims 1 to 6, wherein: and only one of the winding and the oil pump is arranged.
8. The high overload capacity oil filled distribution transformer of any one of claims 1 to 6, wherein: the number of the windings is three, and the number of the oil pumps is only one.
9. The high overload capacity oil filled distribution transformer of any one of claims 2 to 5, wherein: the windings and the oil pump are respectively connected in a corresponding way in a one-to-one mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011149003.3A CN112103042A (en) | 2020-10-23 | 2020-10-23 | High overload capacity oil-immersed distribution transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011149003.3A CN112103042A (en) | 2020-10-23 | 2020-10-23 | High overload capacity oil-immersed distribution transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112103042A true CN112103042A (en) | 2020-12-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011149003.3A Pending CN112103042A (en) | 2020-10-23 | 2020-10-23 | High overload capacity oil-immersed distribution transformer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114678191A (en) * | 2022-04-28 | 2022-06-28 | 浙江富杰电气有限公司 | Oil immersed shunt reactor |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61160913A (en) * | 1985-01-09 | 1986-07-21 | Tokuden Kk | Insulating oil direct circulating butt iron core type oil-immersed transformer and reactor |
| JPH0669048A (en) * | 1992-08-21 | 1994-03-11 | Toshiba Corp | Transformer connecting-lead-wire device |
| JPH06140258A (en) * | 1992-10-23 | 1994-05-20 | Toshiba Corp | Stationary induction equipment winding |
| CN205092129U (en) * | 2015-11-04 | 2016-03-16 | 江西赣电电气有限公司 | High distribution transformer that transships of oily formula |
| CN107068343A (en) * | 2017-02-22 | 2017-08-18 | 江苏凡高电气有限公司 | A kind of forced guidance cools down Three-phase oil immersion type distribution transformer |
-
2020
- 2020-10-23 CN CN202011149003.3A patent/CN112103042A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61160913A (en) * | 1985-01-09 | 1986-07-21 | Tokuden Kk | Insulating oil direct circulating butt iron core type oil-immersed transformer and reactor |
| JPH0669048A (en) * | 1992-08-21 | 1994-03-11 | Toshiba Corp | Transformer connecting-lead-wire device |
| JPH06140258A (en) * | 1992-10-23 | 1994-05-20 | Toshiba Corp | Stationary induction equipment winding |
| CN205092129U (en) * | 2015-11-04 | 2016-03-16 | 江西赣电电气有限公司 | High distribution transformer that transships of oily formula |
| CN107068343A (en) * | 2017-02-22 | 2017-08-18 | 江苏凡高电气有限公司 | A kind of forced guidance cools down Three-phase oil immersion type distribution transformer |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114678191A (en) * | 2022-04-28 | 2022-06-28 | 浙江富杰电气有限公司 | Oil immersed shunt reactor |
| CN114678191B (en) * | 2022-04-28 | 2024-05-10 | 浙江富杰电气有限公司 | Oil immersed shunt reactor |
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