CN220121618U - Auto-coupling voltage regulating and transforming device - Google Patents

Abstract

The utility model discloses an autotransformer, which comprises an iron core, a voltage regulating transformer, a main transformer, an upper iron yoke and a lower iron yoke, wherein a first core column, a second core column and a bypass core column are arranged on the iron core, the first core column and the bypass core column are respectively arranged at two ends of the iron core, the second core column is arranged between the first core column and the bypass core column, the voltage regulating transformer comprises a first primary winding and a voltage regulating winding, the first primary winding and the voltage regulating winding are connected and wound on the first core column with the core, the main transformer and the second core column are correspondingly arranged, the main transformer comprises a secondary winding and a high-voltage winding, the secondary winding and the high-voltage winding are connected and wound on the second core column with the core column, and the upper iron yoke and the lower iron yoke are respectively arranged at the upper side and the lower side of the iron core. The utility model is suitable for power grids with different voltage levels through the voltage regulating transformers and the main transformers which are arranged on the same core and have different core columns, and has the advantages of strong short circuit resistance, simple structure, high production efficiency, low cost, low loss and convenient and simple operation and maintenance.

Description

Auto-coupling voltage regulating and transforming device

Technical Field

The utility model relates to the technical field of transformers, in particular to an autotransformer.

Background

In the related art, an electric furnace is an important equipment of the modern industry. The electric furnace has very wide application, and is used for smelting alloy steel, ferroalloy and the like in smelting industry, producing yellow phosphorus, calcium carbide, synthetic resin and the like in chemical industry, casting steel, alloy smelting and the like in mechanical industry. The electric furnace transformer is arranged at the front end of the electric furnace working area, provides needed voltage for the electric furnace transformer according to the power of the electric furnace, and is core equipment in a smelting system. With the promotion of the 'double carbon' target in China, the implementation of capacity replacement accelerates the energy-saving technology transformation of the important high-energy-consumption industry, the newly increased capacity input is limited by the environment bearing capacity and the energy consumption index, the high-energy-consumption and small-capacity furnace type is eliminated, and the newly built electric furnace tends to be large. The electric furnace is required to be provided with power supply by three single-phase electric furnace transformers in the large-scale and smelting demands

However, aiming at the special operation condition of the electric furnace and the smelting process requirement, the voltage regulation mode of a series transformer or the voltage regulation mode of an autotransformer is generally adopted to meet the requirements of large-scale and level difference voltage regulation, the series transformer has large loss, complex overall structure, poor manufacturability, poor short-circuit resistance, very inconvenient operation, maintenance and overhaul, and the conventional autotransformer has high insulation requirement, is not suitable for a high-voltage-class power grid, and has complex structure and poor economy.

Disclosure of Invention

The main purpose of the utility model is that: the utility model provides an autotransformer, aim at solving among the prior art to electric stove its special operating mode and smelting technological requirement and generally adopt series transformer voltage regulation mode or autotransformer voltage regulation mode to satisfy the demand of extensive, level difference voltage regulation, series transformer voltage regulation mode's loss is big, overall structure is complicated, manufacturability is poor, anti short circuit ability is poor, operation maintenance is very inconvenient, and conventional autotransformer insulation requirement is high is less suitable for high voltage grade electric wire netting, the structure is complicated, the poor technical problem of economy.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model provides an autotransformer,

optionally, the autotransformer includes:

the iron core is provided with a first core column, a second core column and a bypass core column, the first core column and the bypass core column are respectively arranged at two ends of the iron core, and the second core column is arranged between the first core column and the bypass core column;

the voltage regulating transformer comprises a first primary winding and a voltage regulating winding, and the first primary winding and the voltage regulating winding are connected and wound on the first core column in a concentric manner;

the main transformer is arranged corresponding to the second core column, comprises a secondary winding and a high-voltage winding, and is connected with the high-voltage winding and wound on the second core column in a concentric manner;

the upper iron yoke and the lower iron yoke are respectively arranged on the upper side and the lower side of the iron core.

Optionally, in the autotransformer, the voltage regulating winding includes a plurality of connection terminals and a neutral point, and the terminal of the first primary winding is connected to the neutral point or any connection terminal.

Optionally, in the above autotransformer, the step-up transformer further includes a second primary winding, and the second primary winding and the first primary winding are connected in series to form a layered or pancake coil structure.

Optionally, in the autotransformer, the first primary winding is in a circular structure, an elliptical structure or an oblong structure; and/or the number of the groups of groups,

the second primary winding is in a circular structure, an elliptic structure or an oblong structure; and/or the number of the groups of groups,

the voltage regulating windings are of round structures, elliptic structures or oblong structures.

Optionally, in the above autotransformer, the autotransformer further includes a branch, and the secondary winding includes a secondary outlet terminal, and the secondary outlet terminal is connected in parallel with the branch.

Optionally, in the autotransformer, the secondary winding and the branch are connected in parallel to form a double-cake continuous structure or a spiral structure.

Optionally, in the autotransformer, the number of the second core columns is a plurality of, and the number of the main transformers is consistent with the number of the second core columns and is set in a one-to-one correspondence manner.

Optionally, in the above autotransformer, the main transformer further includes a compensation winding, and the secondary winding, the compensation winding and the high-voltage winding are connected and concentrically wound on the second core column.

Optionally, in the autotransformer, the secondary winding, the compensation winding and the high-voltage winding are connected in parallel.

Optionally, in the autotransformer, the secondary winding, the compensation winding and the high-voltage winding are connected in series.

The one or more technical schemes provided by the utility model can have the following advantages or at least realize the following technical effects:

the utility model provides an autotransformer, which is suitable for providing power for industrial electric furnaces in metallurgical, chemical and mechanical industries, is suitable for power grids with different voltage levels through voltage regulating transformers and main transformers arranged on the same core and different core columns, meets the requirements of different capacities and different short lease impedances, can reduce the voltage of a higher power grid to low voltage and large current output required by the electric furnaces, meets the requirement of a large voltage regulating range, avoids the defects of large transformer loss of a series transformer voltage regulating furnace, large transformer impedance change range in the whole voltage regulating range, complex overall structure, long production period of special winding of a coil structure, and inconvenient operation, maintenance and overhaul, and avoids the defects of low material utilization rate, low economy, complex insulation structure, high requirements on the insulation level of a branching switch for 110kV and above power grid systems.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions of the prior art, the drawings which are required in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the utility model, and that other drawings may be obtained from the drawings provided without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of an embodiment of an autotransformer device according to the present utility model;

FIG. 2 is a schematic diagram of an embodiment of an autotransformer device according to the present utility model;

fig. 3 is a schematic structural view of an embodiment of a core according to the present utility model;

fig. 4 is a schematic structural view of another embodiment of the core according to the present utility model;

fig. 5 is a schematic diagram of a line-end autotransformer voltage regulator according to the present utility model;

FIG. 6 is a schematic diagram of a neutral point autotransformer voltage regulator according to the present utility model;

FIG. 7 is a schematic diagram of a middle autotransformer voltage regulator wire according to the present utility model;

fig. 8 is a schematic diagram of the main transformer according to the present utility model, in which each winding is connected in series or in parallel.

Reference numerals illustrate:

reference numerals	Name of the name	Reference numerals	Name of the name
				100	Iron core	200	Voltage regulating transformer
300	Main transformer	400	Upper iron yoke
				500	Lower iron yoke	110	First stem
120	Second stem	130	Bypass stem
				210	First primary winding	220	Voltage regulating winding
310	Secondary winding	320	High-voltage winding
				330	Compensation winding

The achievement of the objects, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the present utility model more apparent, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are only some embodiments of the present utility model, but not all embodiments of the present utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that, in the embodiment of the present utility model, all directional indications (such as up, down, left, right, front, and rear … …) are merely used to explain the relative positional relationship, movement conditions, and the like between the components in a certain specific posture (as shown in the drawings), and if the specific posture is changed, the directional indication is changed accordingly.

In the present disclosure, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element. In addition, the meaning of "and/or" as it appears throughout includes three parallel schemes, for example "A and/or B", including the A scheme, or the B scheme, or the scheme where A and B are satisfied simultaneously.

In the present utility model, unless explicitly specified and limited otherwise, the terms "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be either a fixed connection or a removable connection or integrated; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium; the communication between the two elements can be realized, or the interaction relationship between the two elements can be realized.

In the present utility model, if there is a description referring to "first", "second", etc., the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature.

In the present utility model, suffixes such as "module", "assembly", "piece", "part" or "unit" used for representing elements are used only for facilitating the description of the present utility model, and have no specific meaning per se. Thus, "module," "component," or "unit" may be used in combination.

The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances. In addition, the technical solutions of the embodiments may be combined with each other, but it is based on the fact that those skilled in the art can implement the combination of the technical solutions, when the technical solutions contradict each other or cannot be implemented, the combination of the technical solutions should be considered as not existing and not falling within the protection scope of the present utility model.

The inventive concept of the present utility model is further elucidated below in connection with some embodiments.

The utility model provides an autotransformer.

Referring to fig. 1 and 2, fig. 1 is a schematic structural diagram of an embodiment of an autotransformer according to the present utility model, and fig. 2 is a schematic structural diagram of another embodiment of an autotransformer according to the present utility model.

In an embodiment of the present utility model, as shown in fig. 1 and 2, an autotransformer includes a core 100, a transformer 200, a main transformer 300, an upper yoke 400 and a lower yoke 500, a first leg 110, a second leg 120 and a bypass leg 130 are disposed on the core 100, the first leg 110 and the bypass leg 130 are disposed at two ends of the core 100, the second leg 120 is disposed between the first leg 110 and the bypass leg 130, the transformer 200 includes a first primary winding 210 and a voltage regulating winding 220, the first primary winding 210 and the voltage regulating winding 220 are connected and wound around the first leg 110, the main transformer 300 is disposed corresponding to the second leg 120, the main transformer 300 includes a secondary winding 310 and a high voltage winding 320, the secondary winding 310 and the high voltage winding 320 are connected and wound around the second leg 120, and the upper yoke 400 and the lower yoke 500 are disposed at upper and lower sides of the core 100, respectively.

It should be noted that: the autotransformer is a single-phase electric furnace transformer with a double-transformer structure, namely, the autotransformer 200 and the main transformer 300. The tap changing transformer 200 and the main transformer 300 are disposed on different legs of the same core 100, and at least three legs are disposed on the same core 100, and each leg of the same core 100 provides a flux path for the magnetic flux of the tap changing transformer 200, the magnetic flux of the main transformer 300, and the resultant magnetic flux thereof, respectively. The upper yoke 400, the lower yoke 500, and the shunt leg 130 of the core 100 provide a path for the resultant magnetic fluxes of the tap changer 200 and the main transformer 300.

It should be appreciated that the regulating transformer 200 is coupled between the grid and the main transformer 300 to meet the requirements of a wide range of regulating outputs of the electric furnace transformer. The voltage regulating transformer 200 can adopt various self-coupling connection modes such as line terminal voltage regulation, neutral point voltage regulation or middle voltage regulation, and the like, so as to be suitable for power grids with different voltage classes.

The voltage regulating transformer 200 is connected between the power grid and the main transformer 300, and can adopt various self-coupling connection modes such as line end voltage regulation, neutral point voltage regulation or middle voltage regulation, and the like, and different connection modes are suitable for power grids with different voltage classes. The primary winding of the voltage regulating transformer 200 can be divided into a plurality of parts, the number of turns of each part can be freely set, the direct action of overvoltage of a power grid on the on-load voltage regulating switch and the main transformer 300 can be reduced while the large-scale voltage regulation is realized, and the reliability and the economy of the transformer are improved.

The high voltage winding 320 and the secondary winding 310 of the main transformer 300 can be connected in a one-way wiring manner or in a two-way series connection manner or a two-way parallel connection manner so as to adapt to different capacity and short circuit impedance requirements.

It should be noted that, according to different connection modes, the arrangement sequence of the coils of the voltage regulating transformer 200 from the core 100 to the outside sequentially may be the core 100, the primary winding and the voltage regulating winding 220; or the core 100, the voltage regulating winding 220, and the primary winding.

The first stem 110 and the bypass stem 130 may be different shapes having the same cross-sectional area.

The technical scheme of the utility model is suitable for providing power for industrial electric furnaces in metallurgical, chemical and mechanical industries, is suitable for power grids with different voltage levels through the voltage regulating transformers 200 and the main transformers 300 which are arranged on the same iron core 100 and are provided with different core columns, meets the requirements of different capacities and different short-term impedances, can reduce the voltage of the higher power grid to the low voltage and large current output required by the electric furnace, meets the requirement of a large voltage regulating range, avoids the defects of large transformer loss of the voltage regulating furnace of the series transformer, large change range of the impedance of the transformer in the whole voltage regulating range, complex integral structure, long production period of special winding of a coil structure and inconvenient operation and maintenance, and avoids the defects of low material utilization rate, low economy, complex insulating structure of the transformer and high requirement of the insulating level of a split switch of the traditional autotransformer 200, namely the technical scheme of the utility model has strong short-circuit resistance, simple structure, high production efficiency, low cost, low loss, low carbon, environment protection and convenient and simple operation and maintenance.

Further, the voltage regulating winding 220 includes a plurality of connection terminals and a neutral point, and the connection terminal of the first primary winding 210 is coupled to the neutral point or any connection terminal.

It should be noted that, the connection between the primary winding of the voltage regulating transformer 200 and the voltage regulating winding 220 may be in various self-coupling connection manners such as a line terminal, a neutral point or a middle part, so as to be suitable for power grids with different voltage classes.

Further, the regulating transformer 200 further includes a second primary winding coupled in series with the first primary winding 210 in a layered or pancake coil configuration.

It should be noted that the number of turns of the first primary winding 210 and the second primary winding connected in series with the first primary winding 210, which constitute the voltage regulating transformer 200, may be freely set according to the form of the first primary winding 210 and the withstand voltage of the main transformer 300, and the coil formed by connecting the first primary winding 210 and the second primary winding in series with the first primary winding 210 may be a layer-type or a pancake-type coil.

Further, the first primary winding 210 has a circular structure, an oval structure, or an oblong structure; and/or the number of the groups of groups,

the second primary winding is in a circular structure, an elliptic structure or an oblong structure; and/or the number of the groups of groups,

the voltage regulating windings 220 are each of circular, oval or oblong configuration.

It should be noted that, according to the actual requirement of autotransformer, the embodiments of the first primary winding 210, the second primary winding and the voltage regulating winding 220 on the same core 100 are as follows: the first primary winding 210 may be any one of a circular structure, an oval structure, or an oblong structure, the second primary winding may be any one of a circular structure, an oval structure, or an oblong structure, and the voltage regulating winding 220 may be any one of a circular structure, an oval structure, or an oblong structure.

Further, the autotransformer further includes a leg, and the secondary winding 310 includes a secondary outlet terminal coupled in parallel with the leg.

Further, the secondary winding 310 is coupled in parallel with the legs in a double-pancake continuous or spiral configuration.

It should be noted that, the secondary winding 310 of the main transformer 300 may be configured with a suitable parallel branch according to the number of secondary outlet terminals of the electric furnace transformer, and may be a double-pancake continuous or spiral structure.

It should be understood that the number of parallel branches of the secondary winding 310 of the main transformer 300 is set according to the number of secondary outlet terminals of the transformer, and the spiral coil is wound using the transposition wire.

With continued reference to fig. 1 and 2, and with reference to fig. 3, 4, 5, 6, 7 and 8, fig. 3 is a schematic structural view of an embodiment of the core 100 according to the present utility model, fig. 4 is a schematic structural view of another embodiment of the core 100 according to the present utility model, fig. 5 is a schematic diagram of a line-end autotransformer connection wire according to the present utility model, fig. 6 is a schematic diagram of a neutral autotransformer connection wire according to the present utility model, fig. 7 is a schematic diagram of a middle autotransformer connection wire according to the present utility model, and fig. 8 is a schematic diagram of two-way series connection wires or two-way parallel connection wires for each winding of the main transformer 300 according to the present utility model.

Further, as shown in fig. 1 to 8, the number of the second core columns 120 is plural, and the number of the main transformers 300 is identical to that of the second core columns 120 and is arranged in one-to-one correspondence.

It should be understood that, as shown in fig. 5 to 8, the primary winding of the voltage regulating transformer 200 is connected to the power grid at the end and the head, and the voltage regulating winding 220 is connected to the on-load voltage regulating switch, and is connected to the primary winding by adopting a line-end autotransformer, a neutral point autotransformer and a middle autotransformer, so that the voltage regulating transformer can be suitable for power grids with different voltage classes.

As shown in fig. 5, the primary winding and the voltage regulating winding 220 of the voltage regulating transformer 200 are adapted to power grid systems of 35kV and below by using a line-end self-coupling voltage regulating connection method. The insulation structures of the voltage regulating transformer 200 and the main transformer 300 are simple, and the line terminal self-coupling voltage regulating connection is adopted, so that the economical efficiency is good.

As shown in fig. 6, the primary winding and the voltage regulating winding 220 of the voltage regulating transformer 200 are connected by neutral point autotransformer, and are suitable for the hierarchical insulated power grid system with the voltage of more than 35 kV. The low level of insulation on the neutral point side, where the voltage regulating winding 220 is coupled, can avoid the effects of high grid overvoltage experienced by the on-load voltage regulating switch and the main transformer 300.

As shown in fig. 7, the primary winding and the voltage regulating winding 220 of the voltage regulating transformer 200 are adapted to a full-scale insulated power grid system with a voltage of 35kV or higher by adopting a middle auto-coupling voltage regulating connection mode. The primary winding may be divided into a plurality of parts such as a first primary winding 210 and a plurality of second primary windings connected in series with each other. The voltage regulating winding 220 is connected between two connected primary coils in series, so that the on-load voltage regulating switch can be prevented from bearing higher overvoltage of the power grid.

As shown in fig. 8, fig. 8 is a further discussion of the structure shown in fig. 3 and 4, with the high voltage winding 320, the secondary winding 310, and the compensation winding 330 of the main transformer 300 being disposed on the plurality of second legs 120 of the core 100. Depending on the transformer capacity and the voltage of the output of the regulating transformer 200, the high voltage winding 320 may be two-way series connection (as shown in fig. 8) or two-way parallel connection. The secondary winding 310 typically employs two parallel wires.

It should be noted that, in fig. 5 to 8, the current of the power grid enters the voltage regulating transformer 200 through the a end, and after the current of the power grid is split in the voltage regulating transformer 200, the current enters the main transformer 300 through any one of the 1 to n ends, so as to realize the auto-coupling voltage regulation.

Further, the main transformer 300 further includes a compensation winding 330, and the secondary winding 310, the compensation winding 330, and the high voltage winding 320 are coupled to and concentrically wound around the second limb 120.

It should be noted that, according to the requirements of the system on the power factor and the control of the reactive power loss, a compensation winding 330 may be disposed on the main transformer 300 to connect with a compensation capacitor to provide the power factor, so as to reduce the reactive power loss.

Further, the secondary winding 310, the compensation winding 330, and the high voltage winding 320 are coupled in parallel.

Further, the secondary winding 310, the compensation winding 330, and the high voltage winding 320 are coupled in series.

It should be understood that the compensation winding 330 is connected to the capacitance compensator for reactive compensation, and the compensation winding 330 may be a single-path connection or two-path series connection and parallel connection line mode according to the required compensation capacity and compensation voltage. Finally, it should be noted that the foregoing reference numerals of the embodiments of the present utility model are merely for describing the embodiments, and do not represent the advantages and disadvantages of the embodiments. The above embodiments are only optional embodiments of the present utility model, and not limiting the scope of the present utility model, and all equivalent structures or equivalent processes using the descriptions of the present utility model and the accompanying drawings or direct or indirect application in other related technical fields are included in the scope of the present utility model.

Claims (10)

1. An autotransformer, comprising:

the iron core is provided with a first core column, a second core column and a bypass core column, the first core column and the bypass core column are respectively arranged at two ends of the iron core, and the second core column is arranged between the first core column and the bypass core column;

the voltage regulating transformer comprises a first primary winding and a voltage regulating winding, and the first primary winding and the voltage regulating winding are connected and wound on the first core column in a concentric manner;

the main transformer is arranged corresponding to the second core column, comprises a secondary winding and a high-voltage winding, and is connected with the high-voltage winding and wound on the second core column in a concentric manner;

the upper iron yoke and the lower iron yoke are respectively arranged on the upper side and the lower side of the iron core.

2. The autotransformer of claim 1, wherein said voltage regulating winding includes a plurality of terminals and a neutral point, said terminal of said first primary winding being coupled to said neutral point or any of said terminals.

3. The autotransformer of claim 1, wherein the step-up transformer further includes a second primary winding coupled in series with the first primary winding in a layered or pancake coil configuration.

4. The autotransformer of claim 3, wherein said first primary winding is of circular, oval or oblong configuration; and/or the number of the groups of groups,

the second primary winding is in a circular structure, an elliptic structure or an oblong structure; and/or the number of the groups of groups,

the voltage regulating windings are of round structures, elliptic structures or oblong structures.

5. The autotransformer of claim 1, further including a leg, wherein the secondary winding includes a secondary outlet terminal, the secondary outlet terminal being coupled in parallel with the leg.

6. The autotransformer of claim 5, wherein said secondary winding is coupled in parallel with said legs in a double-pancake continuous or spiral configuration.

7. The autotransformer of any one of claims 1 to 6, wherein the number of said second core columns is plural, and the number of said main transformers is identical to and is set in one-to-one correspondence with said second core columns.

8. The autotransformer of any one of claims 1 to 6, wherein said main transformer further includes a compensation winding, said secondary winding, said compensation winding, and said high voltage winding are coupled and wound concentrically about said second limb.

9. The autotransformer of claim 8 wherein said secondary winding, said compensation winding, and said high voltage winding are coupled in parallel.

10. The autotransformer of claim 8 wherein said secondary winding, said compensation winding, and said high voltage winding are coupled in series.