CN212659413U - Transformer, electrical equipment and photovoltaic inverter for plateau application - Google Patents
Transformer, electrical equipment and photovoltaic inverter for plateau application Download PDFInfo
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- CN212659413U CN212659413U CN202020762952.8U CN202020762952U CN212659413U CN 212659413 U CN212659413 U CN 212659413U CN 202020762952 U CN202020762952 U CN 202020762952U CN 212659413 U CN212659413 U CN 212659413U
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Abstract
The application provides a transformer, electrical equipment and photovoltaic inverter for plateau application, and relates to the technical field of transformersThe cross-sectional area of the winding wire satisfies Sh＝(H/1000)×(1+XT) X S, H is the altitude of the position where the transformer is located, and H is greater than or equal to 1000 m; s is the original wire sectional area of the transformer when the altitude is less than 1000 m; coefficient of temperature rise XTGreater than or equal to 0.03; when H is greater than 2000m, the electric gap l between the primary winding and the secondary windinggh＝(1+uh)×lg，uhIs the electrical clearance coefficient at altitude, /)gFor the original safety electric gap, u, found by inquiryh0.01X (H-2000)/100. The sectional area and the electric clearance of specific wire for transformer radiating effect and insulating properties promote, adapt to plateau environment, safe and reliable when plateau district uses.
Description
Technical Field
The application relates to the technical field of transformers, in particular to a transformer, electrical equipment and a photovoltaic inverter applied to a plateau.
Background
In a plateau area, the photovoltaic inverter is widely used, and the plateau area is special in environment, namely, the temperature difference between day and night is large, air is thin and air pressure is small, so that the heat dissipation performance of the photovoltaic inverter is poor, the insulation performance is reduced, and the reliability of the product is greatly reduced.
The transformer in the photovoltaic inverter is one of important devices, and the heat dissipation effect and the insulation performance of the transformer are reduced in the plateau area environment, so that the reliability of the transformer and the reliability of the photovoltaic inverter are seriously influenced.
SUMMERY OF THE UTILITY MODEL
In view of this, the present application provides a transformer, an electrical device and a photovoltaic inverter for plateau application, and aims to solve the technical problem that the heat dissipation effect of the transformer in the prior art is reduced in the plateau area environment, and the reliability of the transformer and the reliability of the photovoltaic inverter are seriously affected to a certain extent.
In a first aspect, the present application provides a transformer for plateau applications, the transformer for plateau applications includes a winding, the winding includes a primary winding and a secondary winding, the primary winding and the secondary winding are both wound on a magnetic core, and a wire sectional area S of the winding is providedhIs set to meet the following requirements:
Sh＝(H/1000)×(1+XT)×S
wherein the content of the first and second substances,
h is defined as the altitude of the location of the transformer of the plateau application, H being greater than or equal to 1000 m;
s is defined as the original wire sectional area obtained by calculation when the altitude of the transformer applied to the plateau is less than 1000 m;
XTis defined as the temperature rise coefficient, XTGreater than or equal to 0.03.
Preferably, said temperature rise coefficient XTLess than or equal to 0.1.
Preferably, when the altitude H of the location of the transformer for the plateau application is greater than 2000m, an electrical gap i is formed between the primary winding and the secondary windingghIs set to meet the following requirements:
lgh＝(1+uh)×lg
wherein the content of the first and second substances,
uhis defined as the electrical clearance coefficient of altitude, uhGreater than 0;
lgdefined as the original safe electrical clearance queried according to safety standards.
Preferably, the electrical clearance coefficient u of altitudehThe following requirements are met:
uh＝0.01×(H-2000)/100。
preferably, the altitude H of the location of the transformer for the plateau application is less than or equal to 5000 m.
Preferably, the original wire sectional area S is calculated by:
S＝I/J
wherein the content of the first and second substances,
i is defined as the value of current that the wire of the winding needs to pass through;
j is defined as the current density of the material of the wire forming the winding.
Preferably, the primary winding and the secondary winding are arranged on the magnetic core in an overlapping installation manner; the transformer for plateau application is formed into a single-phase transformer, and the lead of the winding is formed by a copper material; the wire of the winding is formed in a rectangular shape in cross section.
In a second aspect, the present application provides an electrical apparatus, when an altitude H of a location where the electrical apparatus is located is greater than 2000m, the electrical apparatus comprising:
a first electrical component and a second electrical component, both conducting current and forming an electrical gap lghThe electrical gap is set to:
lgh＝(1+uh)×lg
wherein the content of the first and second substances,
uhis defined as the electrical clearance coefficient of altitude, uhGreater than 0;
lgdefined as the original safe electrical clearance queried according to safety standards.
Preferably, the electrical clearance coefficient u of altitudehThe following requirements are met:
uh＝0.01×(H-2000)/100
the electrical equipment is formed into a transformer, the first electrical component is formed into a primary winding of the transformer, the second electrical component is formed into a secondary winding of the transformer, the altitude H of the position where the transformer is located is less than or equal to 5000m, and H is greater than or equal to 1000 m;
the primary winding and the secondary winding are defined as windings of the transformer, and the wire sectional area Sh of the windings is set to satisfy the following requirements:
Sh＝(H/1000)×(1+XT)×S
wherein the content of the first and second substances,
s is defined as the original wire sectional area obtained by calculation when the altitude of the transformer is less than 1000 m;
XTis defined as the temperature rise coefficient, XTGreater than or equal to 0.03, and XTLess than or equal to 0.1.
In a third aspect, the present application provides a photovoltaic inverter comprising a transformer for plateau applications as described above.
The application provides a transformer that plateau was used possesses the sectional area of specific wire under the plateau environment for the radiating effect that the transformer possessed has obtained the promotion, thereby adapts to the plateau environment, and safe and reliable when consequently using in plateau district.
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.
Fig. 1 shows a schematic representation of an axonometric view of a transformer for plateau applications.
Reference numerals:
1-a primary winding; 2-a secondary winding; 3-conductive copper bars; h-thickness of the conductive copper bar; l-width of the conductive copper bar; lgh-an electrical gap.
Detailed Description
The technical solutions of the present application will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present application.
Fig. 1 shows a schematic representation of an axonometric view of a transformer. Referring to fig. 1, the transformer for plateau application provided by the present embodiment includes a winding and a magnetic core, and the structure and the operation principle of the above components will be described in detail below.
The winding of the transformer comprises a primary winding 1 and a secondary winding 2, wherein the primary winding 1 and the secondary winding 2 are wound on the magnetic core, and particularly, the primary winding 1 and the secondary winding 2 can be arranged on the magnetic core in an overlapped installation mode, so that high installation strength is ensured, and the lead is facilitated. As shown in fig. 1, the transformer in the present embodiment may include two primary windings 1 and two secondary windings 2, wherein the two primary windings 1 are respectively arranged at two ends in the vertical direction, the two secondary windings 2 are located between the two primary windings 1, and an electrical gap l is formed between the adjacent primary windings 1 and the adjacent secondary windings 2gh。
The winding can be formed by taking the conductive copper strips 3 as wires, namely the wires of the winding are formed by copper materials, and the cross section of the wires of the winding is formed into a rectangle, so that the processing is convenient. With continued reference to FIG. 1, the formation of conductive copper is illustrated in FIG. 1Two parameters of the rectangular cross-section of the strip 3, i.e. the width l of the conductive copper strip and the thickness h of the conductive copper strip, multiplied by the wire cross-sectional area S of the windingh。
In the embodiment, the wire sectional area Sh of the above-described winding is set to satisfy the following requirements:
Sh＝(H/1000)×(1+XT)×S
where H is defined as the altitude at which the transformer is located, H is greater than or equal to 1000m and may be less than or equal to 5000 m. S is defined as the original wire cross-sectional area calculated for a transformer at an altitude less than 1000 m. XTIs defined as the temperature rise coefficient, XTGreater than or equal to 0.03 and may be less than or equal to 0.1. For these parameters, the following will be described in detail.
The air in the plateau environment is thin and the air pressure is small, and the reduction of the air pressure or the air density can cause the reduction of the cooling effect of the air medium, which has obvious influence on the heat dissipation performance of the transformer taking natural convection, forced ventilation or an air radiator as the main heat dissipation mode. Because the heat dissipation capacity of the transformer is reduced, the temperature rise of the transformer is increased, so that the significance of the above formula is that the temperature rise is increased by 3% -10% when the average air pressure is reduced by 7.7-10.5 kPa within the range of the elevation of 5000m and each liter is 1000 m. Coefficient of temperature rise XTI.e. a constant drawn up according to the pressure change and the temperature rise change of the transformer. In the embodiment, the altitude H of the position where the transformer is located is greater than or equal to 1000m because the influence of the air pressure on the heat dissipation performance of the transformer is not obvious when the altitude is less than 1000 m.
The original wire cross-sectional area S can be calculated using existing formulas and known parameters of the transformer. Namely, the original wire sectional area S is obtained by the following calculation mode:
S＝I/J
where I is defined as the value of the current that the wire of the winding needs to pass through. J is defined as the current density of the material of the wire forming the winding. In the embodiment, the current value I required to be passed by the lead can be the current value meeting the working requirement when the transformer works stably. Of current density JThe unit is A/mm2(amperes per square millimeter), for a wire formed of a copper material, its safe current-carrying capacity may be 5 to 8A/mm2This is the range of values of the current density J.
In addition, in plateau areas, due to the low air density, the dielectric strength of air is also reduced, so that the air gap discharge voltage is obviously reduced, namely the withstand voltage strength is reduced, which directly results in the reduction of the insulation performance of the transformer. The electrical gap l thus formed between the primary winding 1 and the secondary winding 2ghMay be set to meet the following requirements:
lgh＝(1+uh)×lg
wherein u ishIs defined as the electrical clearance coefficient of altitude, uhGreater than 0. lgDefined as the original safe electrical clearance queried according to the safety standards for photovoltaic inverters.
Specifically, the electrical clearance coefficient u for altitudehIt can meet the following requirements:
uh＝0.01×(H-2000)/100
when the altitude H of the transformer is within the range of 1000m to 5000m and the altitude H of the transformer is greater than 2000m, the altitude electric clearance coefficient u is obtainedhThe above formula (a) means that the electrical insulation strength of an electrical device insulated with air, such as a transformer, decreases by 1% with an elevation of 100m at an altitude of more than 2000 m. That is, when the altitude H of the location where the transformer is located is less than or equal to 2000m, the effect of the decrease in air density on the dielectric strength of air is insignificant.
In addition, the electrical clearance l is concernedghThe dimensional requirements for the location of the transformer at an altitude H greater than 2000m are also applicable to the determination of the electrical gap of other air-insulated electrical devices, i.e. such electrical devices comprise a first electrical component and a second electrical component, through which current flows and an electrical gap is formed, which can be determined by means of the electrical gap lghThe requirements of (2). Thus the electrical equipment is on the plateauIn the using process of the environment, the insulating property is also improved, so that the device can adapt to the use in the plateau environment and has good reliability and safety.
According to the above described features, the following will be exemplified according to the actual parameters of the transformer.
Taking the transformer of the 20KW inverter as an example, since the output voltage is AC220V (AC 220V), it can be calculated that the output current Io at rated output is 20000W/220V 90.9A, the current density J is 5A/mm2, and the original wire cross-sectional area S of the conductive copper bar 3 of the secondary winding 2 is:
S＝Io/J＝90.9/5＝18.18mm2
the inverter is positioned in a plateau area with the altitude of 4000 meters, and the sectional area S of a wire of a windinghComprises the following steps:
Sh＝(H/1000)×(1+XT)×S＝(4000/1000)×(1+0.05)×18.18＝76.356mm2
wire cross-sectional area S based on windinghThe thickness h that can get electrically conductive copper bar is 3mm, and then copper bar width l is:
l＝Sh/h＝76.356/3＝25.5mm
therefore, the transformer can be safely operated at rated power in a 4000-meter plateau area by adopting the conductive copper strips 3 with the width and the thickness.
Likewise, the 20KW inverter output AC220V, according to the safety standard requirements, the original safety electrical gap l between the primary winding 1 and the secondary winding 2 of the transformergShould be 1.5 mm. When the inverter is positioned in a plateau area with the altitude of 4000 meters, an electric gap l between the primary winding 1 and the secondary winding 2 of the transformerghComprises the following steps:
lgh＝[1+0.01×(H-2000)/100]×lg＝[1+0.01×(4000-2000)/100]×1.5＝1.8mm
therefore, the above-mentioned electrical gap l is adoptedghThe transformer can have reliable insulation performance in a 4000-meter plateau area.
The transformer in the embodiment has the specific sectional area of the lead and the electric gap between the primary winding 1 and the secondary winding 2 in the plateau environment, so that the heat dissipation effect and the insulation capacity of the transformer are improved, the transformer is suitable for the plateau environment, and the transformer is safe and reliable when being used in the plateau area.
The embodiment further provides a photovoltaic inverter, which includes the transformer and also includes the above beneficial effects, which are not described herein again.
The above description is only a preferred embodiment of the present application, and not intended to limit the scope of the present application, and all changes that can be made in the details of the present application and the equivalents thereof, or directly or indirectly applied to other related technical fields, without departing from the spirit of the present application are intended to be embraced therein.
Claims (10)
1. A transformer for plateau application, the transformer for plateau application comprises a winding, the winding comprises a primary winding and a secondary winding, the primary winding and the secondary winding are wound on a magnetic core, and the transformer is characterized in that the sectional area S of a lead wire of the winding is ShIs set to meet the following requirements:
Sh＝(H/1000)×(1+XT)×S
wherein the content of the first and second substances,
h is defined as the altitude of the location of the transformer of the plateau application, H being greater than or equal to 1000 m;
s is defined as the original wire sectional area obtained by calculation when the altitude of the transformer applied to the plateau is less than 1000 m;
XTis defined as the temperature rise coefficient, XTGreater than or equal to 0.03.
2. A transformer for high altitude applications according to claim 1, characterized in that the temperature rise coefficient XTLess than or equal to 0.1.
3. The transformer for plateau use according to claim 2, wherein the primary winding and the secondary winding are arranged at an altitude H greater than 2000m at a location of the transformer for plateau useAn electrical gap l formed therebetweenghIs set to meet the following requirements:
lgh＝(1+uh)×lg
wherein the content of the first and second substances,
uhis defined as the electrical clearance coefficient of altitude, uhGreater than 0;
lgdefined as the original safe electrical clearance queried according to safety standards.
4. The transformer for plateau use of claim 3, wherein the electrical clearance coefficient at altitude u ishThe following requirements are met:
uh＝0.01×(H-2000)/100。
5. a transformer for plateau use as claimed in any one of claims 1 to 4, wherein the altitude H at which the transformer for plateau use is located is less than or equal to 5000 m.
6. A transformer for plateau use as claimed in claim 5, wherein the original wire cross-sectional area S is calculated by:
S＝I/J
wherein the content of the first and second substances,
i is defined as the value of current that the wire of the winding needs to pass through;
j is defined as the current density of the material of the wire forming the winding.
7. A transformer for plateau use as claimed in claim 5,
the primary winding and the secondary winding are arranged on the magnetic core in an overlapping installation mode; the transformer for plateau application is formed into a single-phase transformer, and the lead of the winding is formed by a copper material; the wire of the winding is formed in a rectangular shape in cross section.
8. An electrical apparatus, characterized in that when an altitude H of a location where the electrical apparatus is located is greater than 2000m, the electrical apparatus comprises:
a first electrical component and a second electrical component, both conducting current and forming an electrical gap lghThe electrical gap is set to:
lgh＝(1+uh)×lg
wherein the content of the first and second substances,
uhis defined as the electrical clearance coefficient of altitude, uhGreater than 0;
lgdefined as the original safe electrical clearance queried according to safety standards.
9. The electrical apparatus of claim 8, wherein the altitude electrical clearance coefficient uhThe following requirements are met:
uh＝0.01×(H-2000)/100
the electrical equipment is formed into a transformer, the first electrical component is formed into a primary winding of the transformer, the second electrical component is formed into a secondary winding of the transformer, the altitude H of the position where the transformer is located is less than or equal to 5000m, and H is greater than or equal to 1000 m;
the primary winding and the secondary winding are defined as windings of the transformer, and the wire sectional area Sh of the windings is set to satisfy the following requirements:
Sh＝(H/1000)×(1+XT)×S
wherein the content of the first and second substances,
s is defined as the original wire sectional area obtained by calculation when the altitude of the transformer is less than 1000 m;
XTis defined as the temperature rise coefficient, XTGreater than or equal to 0.03, and XTLess than or equal to 0.1.
10. A photovoltaic inverter, characterized by comprising a transformer for plateau use as claimed in any one of claims 1 to 7.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020762952.8U CN212659413U (en) | 2020-05-09 | 2020-05-09 | Transformer, electrical equipment and photovoltaic inverter for plateau application |
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| CN202020762952.8U CN212659413U (en) | 2020-05-09 | 2020-05-09 | Transformer, electrical equipment and photovoltaic inverter for plateau application |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116317619A (en) * | 2023-04-27 | 2023-06-23 | 深圳市三瑞电源有限公司 | Adaptive energy storage inverter for regions with large day and night temperature difference |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116317619A (en) * | 2023-04-27 | 2023-06-23 | 深圳市三瑞电源有限公司 | Adaptive energy storage inverter for regions with large day and night temperature difference |
| CN116317619B (en) * | 2023-04-27 | 2023-07-21 | 深圳市三瑞电源有限公司 | Adaptive energy storage inverter for regions with large day and night temperature difference |
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