CN113593846A - Low-loss dry-type transformer - Google Patents
Low-loss dry-type transformer Download PDFInfo
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- CN113593846A CN113593846A CN202110631872.8A CN202110631872A CN113593846A CN 113593846 A CN113593846 A CN 113593846A CN 202110631872 A CN202110631872 A CN 202110631872A CN 113593846 A CN113593846 A CN 113593846A
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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
- H01F27/24—Magnetic cores
- H01F27/245—Magnetic cores made from sheets, e.g. grain-oriented
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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
- H01F27/33—Arrangements for noise damping
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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
- H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
-
- 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
- H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
- H01F27/341—Preventing or reducing no-load losses or reactive currents
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Coils Of Transformers For General Uses (AREA)
Abstract
The invention discloses a low-loss dry-type transformer, which comprises: a transformer body comprising: a transformer body including a plurality of coils and an iron core; the iron core is composed of a plurality of iron core sheets which are arranged in a stacked mode, the iron core sheets adopt a multi-stage stepping stacked structure, and each layer of the iron core sheets are located on the same horizontal plane; the widths of the two ends of the iron core piece are gradually reduced from the middle part to the end part; the coil is coaxially wound on the core column; the coil comprises a first winding and a second winding, the number of turns of the first winding is less than that of the second winding, and the second winding is sleeved on the periphery of the first winding; the shell is sleeved on the transformer body. The invention improves the structure of the iron core sheet, reduces the vibration and noise generated in the working process, reduces the no-load and load loss of the transformer, reduces the waste of electric energy and improves the stability and reliability of the dry-type transformer in the working process.
Description
Technical Field
The invention relates to the technical field of transformers, in particular to a low-loss dry-type transformer.
Background
The power transformer is core equipment of a power grid, is electrical equipment for changing alternating voltage by utilizing an electromagnetic induction principle, improves the power supply safety and reliability, and has important significance in producing a power system for transmitting, transmitting and distributing electric energy. However, the no-load loss and the load loss of the power transformer increase sharply in the working process, and the actual work effect of the power transformer is affected. The existing transformer is difficult to reduce the no-load or load loss, so that the waste of electric energy is caused, and the inconvenience is brought to the use of the transformer.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a low-loss dry-type transformer, which effectively reduces the loss of the transformer.
The purpose of the invention is realized by adopting the following technical scheme:
a low-loss dry-type transformer comprising:
a transformer body including a plurality of coils and an iron core; the iron core is composed of a plurality of iron core sheets which are arranged in a stacked mode, the iron core sheets adopt a multi-stage stepping stacked structure, and each layer of the iron core sheets are located on the same horizontal plane; the widths of the two ends of the iron core piece are gradually reduced from the middle part to the end part; and the magnetic flux density of the iron core is not more than 1.5T;
the coil is coaxially wound on the core column of the iron core; the coil comprises a first winding and a second winding, the number of turns of the first winding is less than that of the second winding, and the second winding is sleeved on the periphery of the first winding;
the shell is sleeved on the transformer body.
Furthermore, the iron core comprises a plurality of groups of iron core sheet units, and each group of iron core sheet units comprises a first iron core group and a second iron core group which are arranged according to a preset sequence; the multi-stage stepping stacking structure is characterized in that the first iron chip set is staggered and laminated according to a preset sequence, and the second iron chip set is staggered and laminated according to a reverse sequence of the first iron chip set.
Furthermore, the first iron chip set and the second iron chip set are stacked in a staggered mode to form an isosceles triangle structure.
Further, the first winding adopts a double-layer foil winding, and the second winding adopts a layer winding.
Further, the magnetic flux density of the iron core is 1.4-1.5T.
Further, the core includes a yoke and a leg connected to each other, and a thickness of a core piece of the yoke is the same as a thickness of a core piece of the leg.
Furthermore, the transformer body is also provided with a clamping piece, and the clamping piece is made of insulating materials.
Further, still include heat dissipation circulating device, heat dissipation circulating device includes cooling pipe, cooling pipe locates respectively first winding with in the stem, cooling pipe is equipped with feed liquor pipe, drain pipe respectively, the coolant liquid source is connected to the feed liquor pipe, the leakage fluid dram is connected to the drain pipe, and the cooling water gets into cooling pipe through the feed liquor pipe and is discharged by the drain pipe.
Furthermore, a liquid inlet pipe and a liquid outlet pipe of a cooling pipeline arranged in the first winding are respectively positioned at the top and the bottom of the cooling pipeline, and a gap is formed between the cooling pipeline and the first coil unit; the utility model discloses a cooling device, including stem, cooling pipeline, cooling liquid source, drain, cooling water, the stem is inside to be provided with a plurality ofly cooling pipeline, the cooling pipeline both ends are equipped with a plurality of feed liquor pipes and a plurality of drain pipes respectively, the feed liquor union coupling cooling liquid source, the leakage fluid dram is connected to the drain pipe, and cooling water gets into corresponding cooling pipeline through the feed liquor pipe and is discharged by the drain pipe.
Further, the interface of the iron yoke is rectangular or D-shaped.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a low-loss dry-type transformer, wherein an iron chip adopts a multi-stage stepping type stacked structure, the magnetic flux density of an iron core is kept to be not more than 1.5T, the structure of the iron chip is improved, vibration and noise generated in the working process of the iron chip are reduced, the no-load and load loss of the transformer are reduced, the waste of electric energy is reduced, and the stability and reliability of the dry-type transformer in the working process are improved.
Drawings
Fig. 1 is a schematic diagram of an iron core structure of a low-loss dry-type transformer according to an embodiment of the present invention;
fig. 2 is a schematic diagram of an iron core lamination structure of a low-loss dry-type transformer according to an embodiment of the present invention;
fig. 3 is a schematic cross-sectional view of a core leg and a coil of a low-loss dry-type transformer according to an embodiment of the present invention.
In the figure: 1. a stem; 2. an iron yoke; 3. an iron core sheet; 4. a first winding, 5, a second winding; 6. and (6) cooling the pipeline.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that any combination of the embodiments or technical features described below can be used to form a new embodiment without conflict.
As shown in fig. 1 to 3, the invention provides a low-loss dry-type transformer, which effectively reduces the loss of the transformer, reduces the no-load and load loss of the transformer, and meets the requirements of a high-efficiency energy-saving distribution transformer.
The transformer comprises a transformer body and a shell, wherein the shell is sleeved on the transformer body. The transformer body comprises a plurality of coils and an iron core, the iron core is composed of a plurality of iron core pieces 3 which are arranged in a stacked mode, and the iron core pieces 3 adopt a multi-stage stepping stacking structure; each layer of the iron chip 3 is positioned on the same horizontal plane; the width of the two ends of the iron core plate 3 is gradually reduced from the middle part to the end part. The iron core comprises a yoke 2 and a core column 1 which are connected with each other, and the thickness of an iron core piece 3 of the yoke 2 is the same as that of the iron core piece 3 of the core column 1.
The diameter of an iron core of the distribution transformer is relatively small, the edge of the iron chip 3 is damaged in the shearing process so as to influence the performance of the iron chip, and the smaller the width of the iron chip is, the larger the influence is. In the process of stacking and secondary inserting the iron core pieces 3, the relative value of damage to the iron core pieces 3 caused by mechanical stress is increased. The joint between the core leg 1 and the yoke 2 may reduce the no-load performance, and especially the joint between the core leg 1 and the yoke 2 located in the middle may be difficult to obtain the requirement of the transformer. Therefore, in this application, the iron core sheet 3 adopts the better silicon steel sheet of performance to pile up the silicon steel sheet and adopt multistage marching type stack to reduce no-load loss and no-load current. Since the thickness of each silicon steel sheet is very thin, the lamination factor is calculated as 0.96.
Specifically, the iron core is composed of a plurality of groups of iron core sheet units, and each group of iron core sheet units comprises a first iron core group and a second iron core group which are arranged according to a preset sequence. In the manufacturing process, the first iron chip group is required to be staggered and laminated in sequence, namely, a first stepping is formed, and the second iron chip group is required to be staggered and laminated in the reverse sequence of the first iron chip group, so that a second stepping is formed. And the first iron chip groups and the second iron chip groups are stacked in a staggered manner to form an equilateral triangle structure or an isosceles triangle structure, and the three groups of first iron chip groups and the three groups of second iron chip groups are sequentially stacked according to the sequence, so that the core column 1 and the yoke 2 of the transformer are formed.
As shown in fig. 2, the first chipset includes six different iron core pieces 3, and the first chipset is vertically stacked from top to bottom in a short-to-long manner, and the second chipset also includes the six different iron core pieces 3, and the first chipset is vertically stacked from top to bottom in a short-to-long manner in an opposite order to the first chipset, and then the first chipset is combined with the second chipset.
More, the iron core piece 3 of stem 1 and yoke 2 hookup location is equipped with the recess, the recess is sunken along the direction that 3 tip of iron core pieces shrink, and crisscross splice between the iron core piece 3 of stem 1 and yoke 2, the seam is the echelonment to form the magnetic flux return circuit. The step-shaped seam effectively reduces the no-load iron core loss of the transformer. Under the condition of a step-shaped seam, magnetic lines of force can vertically enter the adjacent iron core pieces 3, no-load current is reduced, electromagnetic force acting on the iron core pieces 3 is reduced, the iron core pieces 3 are pressed tightly, and noise of the transformer is obviously reduced. And the step-shaped seam can effectively reduce the no-load iron core loss of the transformer, and reduce the weight and the manufacturing consumable materials of the iron core.
The iron core pieces 3 of the core column 1 are sequentially connected end to form a whole, so that the generation of eddy current effect on the iron core is further reduced, and the strength of the transformer iron core is increased. As shown in fig. 3, the cross section of the yoke 2 is rectangular or D-shaped, so that the core column 1 and the yoke 2 are overlapped, the weight and the manufacturing consumables of the core are greatly reduced, the noise is reduced, the production cost is saved, and the noise and the no-load loss are further reduced. Meanwhile, the thicknesses of the core column 1 and the iron core piece 3 of the iron yoke 2 are the same, and the gap at the joint between the core column and the iron yoke is reduced. The seam forms certain clearance space, is filled with the epoxy layer in this clearance space, after the heat curing for iron core piece 3 forms a whole, improves transformer insulation system's dielectric strength and insulation resistance, with the improvement electric insulation performance, effectively reduces the turbine effect on first iron core piece 3 and the second iron core piece 3, has further reduced the iron core loss.
When the iron core sheet 3 is excited, the iron core sheet 3 generates magnetostriction, and the magnetostriction rate is closely related to the magnetic field intensity. And with the increase of the magnetic flux density, the medium-high frequency energy is obviously improved. Therefore, the transformer needs to have a reasonable magnetic flux density, which is 1.4-1.5T in this embodiment, so as to reduce the no-load loss.
The transformer is provided with a coil, and the coil is sleeved on the periphery of the core column 1. The coil comprises a first winding 4 and a second winding 5, the number of turns of the first winding 4 is smaller than that of turns of the second winding 5, and the second winding 5 is sleeved on the periphery of the first winding 4. In this application, first winding 4 adopts foil winding, and second winding 5 adopts laminar winding, and is higher than continuous type winding, spiral winding's fill factor, can effectively reduce the size of coil. Meanwhile, due to the gradual increase of the capacity of the distribution transformer, the problem that the winding difficulty is increased due to overlarge thickness when the first winding 4 only uses one copper foil is solved. Therefore, a double-layer copper foil winding or a triple-layer copper foil winding is required. In this application, first winding 4 adopts double-deck copper foil winding, reduction in production cost when reducing the coiling degree of difficulty, reduces the winding volume, reduces no-load loss.
More, the material of the folder of general transformer is magnetic conduction steel, produces to occupy the specific loss value less. However, in the conventional energy-saving transformer, since the specific loss value of the clip is increased due to the decrease of the specified loss value, the clip is preferably made of a non-magnetic steel material or an insulating clip to reduce the loss of the clip. In this embodiment, the insulating clamping piece is adopted as the clamping piece, so that the requirements on the mechanical strength and the electromagnetic performance of the clamping piece are met, the stray loss in the clamping piece is reduced, and the loss of the transformer is further reduced.
Further, the dry type transformer generates a large amount of heat during operation. The winding material is generally copper, and when the temperature rises, the resistivity of the copper rises along with the temperature rise, and the direct current resistance loss generated at the moment also rises. Therefore, the winding and the transformer body need to be cooled, and the load loss of the transformer is reduced. In this embodiment, as shown in fig. 3, a plurality of cooling pipes 6 are disposed inside the first winding 4 and the core column 1, and the cooling liquid enters the cooling pipes 6 through a plurality of liquid inlet pipes, and is discharged through the liquid outlet pipe after filling the cooling pipes 6. In the working process of the transformer, cooling water continuously flows in the cooling pipeline 6 in a circulating manner, so that heat generated by the transformer in the air can be effectively absorbed, the running temperature of an iron core and a coil in the transformer is effectively reduced in a short time, and the overload capacity of the coil is improved. When the transformer needs to operate in a large range or overload, the temperature rise of the coil is controlled within the limit value of the national standard, the operation life of the transformer is prolonged, and the heat dissipation requirement of the transformer is met.
And insulating coil encapsulation bodies are arranged on two sides of the first winding 4 and the second winding 5. The conductive bar extends from the coil enclosure and is connected to the terminal. The liquid inlet pipe and the liquid outlet pipe of the cooling pipeline 6 arranged in the first winding 4 are respectively positioned at the top and the bottom of the cooling pipeline 6, a gap is reserved between the first winding 4 and the second winding 5, and the cooling pipeline 6 is positioned in the gap. The cooling pipeline 6 is respectively provided with a liquid inlet pipe and a liquid outlet pipe, the liquid inlet pipe is connected with a cooling liquid source, and the liquid outlet pipe is connected with a liquid outlet.
The utility model discloses a cooling device, including stem 1, cooling pipe 6 both ends are equipped with a plurality of feed liquor pipes and a plurality of drain pipes respectively, the feed liquor union coupling coolant liquid source, the leakage fluid dram is connected to the drain pipe, and the cooling water gets into corresponding cooling pipe 6 through the feed liquor pipe and is discharged by the drain pipe. The cooling liquid forms multi-pipeline circulation flow, and the cooling liquid in each cooling pipeline 6 flows independently and is not influenced by the rest cooling pipelines 6. This can avoid certain feed liquor pipe or drain pipe to leak, and the coolant liquid can't seal in cooling tube 6 inside, leads to the transformer can not dispel the heat, influences the normal work of transformer. If some liquid inlet pipe or liquid outlet pipe leaks or some cooling pipe 6 is blocked, the cooling liquid in the cooling pipe 6 can be discharged, the cooling work of the cooling pipe 6 is suspended, and the rest cooling pipes 6 are normally used to discharge the heat generated by the transformer in time without influencing the normal work of the transformer.
The invention provides a low-loss dry-type transformer, wherein an iron chip 3 adopts a multi-stage stepping stacking structure, the magnetic flux density of an iron core is kept to be not more than 1.5T, the structure of the iron chip 3 is improved, vibration and noise generated in the working process of the iron chip are reduced, the no-load and load loss of the transformer are reduced, the waste of electric energy is reduced, and the stability and reliability of the dry-type transformer in the working process are improved.
The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are within the protection scope of the present invention.
Claims (10)
1. A low-loss dry transformer, comprising:
a transformer body including a plurality of coils and an iron core; the iron core is composed of a plurality of iron core sheets which are arranged in a stacked mode, the iron core sheets adopt a multi-stage stepping stacked structure, and each layer of the iron core sheets are located on the same horizontal plane; the widths of the two ends of the iron core piece are gradually reduced from the middle part to the end part; and the magnetic flux density of the iron core is not more than 1.5T;
the coil is coaxially wound on the core column of the iron core; the coil comprises a first winding and a second winding, the number of turns of the first winding is less than that of the second winding, and the second winding is sleeved on the periphery of the first winding;
the shell is sleeved on the transformer body.
2. The low-loss dry-type transformer of claim 1, wherein the core comprises a plurality of sets of core sheet units, each set of core sheet units comprising a first set of core sheets and a second set of core sheets arranged in a predetermined order; the multi-stage stepping stacking structure is characterized in that the first iron chip set is staggered and laminated according to a preset sequence, and the second iron chip set is staggered and laminated according to a reverse sequence of the first iron chip set.
3. The low loss dry transformer of claim 2, wherein the first and second laminations are stacked in a staggered manner to form an isosceles triangle configuration.
4. A low loss dry transformer according to claim 1 wherein the first winding is a double layer foil winding and the second winding is a layer winding.
5. The low loss dry transformer of claim 1, wherein said core has a magnetic flux density of 1.4-1.5T.
6. A low loss dry transformer according to claim 1, wherein said core comprises a yoke and a leg connected to each other, the thickness of the core pieces of the yoke being the same as the thickness of the core pieces of the leg.
7. The low loss dry transformer of claim 1, wherein the transformer body is further provided with a clip, the clip being made of an insulating material.
8. The low-loss dry-type transformer of claim 1, further comprising a heat-dissipating circulation device, wherein the heat-dissipating circulation device comprises a cooling pipe, the cooling pipe is respectively disposed in the first winding and the core column, the cooling pipe is respectively provided with a liquid inlet pipe and a liquid outlet pipe, the liquid inlet pipe is connected to a cooling liquid source, the liquid outlet pipe is connected to a liquid outlet, and cooling water enters the cooling pipe through the liquid inlet pipe and is discharged through the liquid outlet pipe.
9. The low loss dry transformer of claim 8, wherein the liquid inlet pipe and the liquid outlet pipe of the cooling pipe disposed in the first winding are respectively located at the top and the bottom of the cooling pipe, and a gap is formed between the cooling pipe and the first coil unit; the utility model discloses a cooling device, including stem, cooling pipeline, cooling liquid source, drain, cooling water, the stem is inside to be provided with a plurality ofly cooling pipeline, the cooling pipeline both ends are equipped with a plurality of feed liquor pipes and a plurality of drain pipes respectively, the feed liquor union coupling cooling liquid source, the leakage fluid dram is connected to the drain pipe, and cooling water gets into corresponding cooling pipeline through the feed liquor pipe and is discharged by the drain pipe.
10. A low loss dry transformer according to claim 6, wherein the interface of the iron yoke is rectangular or "D" shaped.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110631872.8A CN113593846A (en) | 2021-06-07 | 2021-06-07 | Low-loss dry-type transformer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110631872.8A CN113593846A (en) | 2021-06-07 | 2021-06-07 | Low-loss dry-type transformer |
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| CN113593846A true CN113593846A (en) | 2021-11-02 |
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| CN202110631872.8A Pending CN113593846A (en) | 2021-06-07 | 2021-06-07 | Low-loss dry-type transformer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116344169A (en) * | 2023-03-27 | 2023-06-27 | 南京大全变压器有限公司 | Iron core structure for reducing stray loss of oil immersed transformer |
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| CH290106A (en) * | 1950-02-13 | 1953-04-15 | British Thomson Houston Co Ltd | Layered magnetic core. |
| EP0262410A1 (en) * | 1986-09-12 | 1988-04-06 | Siemens Aktiengesellschaft | Iron core for transformers with at least three core legs |
| CN104658743A (en) * | 2015-03-18 | 2015-05-27 | 广州市一变电气设备有限公司 | Low-noise transformer |
| CN204480858U (en) * | 2015-03-18 | 2015-07-15 | 广州市一变电气设备有限公司 | A kind of iron core of transformer |
| JP2019071358A (en) * | 2017-10-10 | 2019-05-09 | 田淵電機株式会社 | Reactor |
| CN111029103A (en) * | 2020-01-02 | 2020-04-17 | 广州市一变电气设备有限公司 | Transformer with circulating liquid cooling function |
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2021
- 2021-06-07 CN CN202110631872.8A patent/CN113593846A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH290106A (en) * | 1950-02-13 | 1953-04-15 | British Thomson Houston Co Ltd | Layered magnetic core. |
| EP0262410A1 (en) * | 1986-09-12 | 1988-04-06 | Siemens Aktiengesellschaft | Iron core for transformers with at least three core legs |
| CN104658743A (en) * | 2015-03-18 | 2015-05-27 | 广州市一变电气设备有限公司 | Low-noise transformer |
| CN204480858U (en) * | 2015-03-18 | 2015-07-15 | 广州市一变电气设备有限公司 | A kind of iron core of transformer |
| JP2019071358A (en) * | 2017-10-10 | 2019-05-09 | 田淵電機株式会社 | Reactor |
| CN111029103A (en) * | 2020-01-02 | 2020-04-17 | 广州市一变电气设备有限公司 | Transformer with circulating liquid cooling function |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116344169A (en) * | 2023-03-27 | 2023-06-27 | 南京大全变压器有限公司 | Iron core structure for reducing stray loss of oil immersed transformer |
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