CN103843085A

CN103843085A - Method of assembling electric transformer

Info

Publication number: CN103843085A
Application number: CN201180073730.9A
Authority: CN
Inventors: 陈成光; C.J.鲁道夫; C.施密德
Original assignee: Siemens AG
Current assignee: Siemens Energy Global GmbH and Co KG
Priority date: 2011-09-30
Filing date: 2011-09-30
Publication date: 2014-06-04
Anticipated expiration: 2031-09-30
Also published as: BR112014007475A2; EP2745299A1; CN103843085B; EP2745299B1; WO2013044510A1; KR20140054361A; BR112014007475B1; EP2745299A4; BR112014007475B8

Abstract

A method of assembling an electric transformer (100) comprises the steps of : combining an electric coil (20) and a transformer core (10) to form an electromagnetic component (50); providing the coil (20) with a press (60); drying the electromagnetic component (50) in a drying oven (70) while the press (60) simultaneously applies mechanical pressure to the coil (20); during or after completing the drying step, providing the coil (20) with at least one mechanical element (80) adapted to prevent the coil (20) from increasing its size; and removing the press (60) from the coil (20) after the at least one mechanical element (80) ensures that the mechanical pressure previously provided by the press (60) is steadily maintained.

Description

The method of assembling piezoelectric transformer

Technical field

The present invention relates to assemble the method for piezoelectric transformer.More particularly, the present invention relates to the compressed method of the coil of transformer in assembling process.

Background technology

Piezoelectric transformer generally includes at least two coils, and at least one is for inputting the one-level coil of electric energy and at least one is for exporting the secondary coil of electric energy.Relation between the winding number of one-level coil and the winding number of secondary coil is determined the electrical characteristics of transformer.

In high-power applications, transformer can be immersed in and make the winding of coil cooling and insulation simultaneously transformer oilin.In order to prevent the electrical breakdown when underload, the transformer of these oil immersions stands the dry run extending, thereby guarantees transformer nothing completely before cold oil is introduced into steam.

A kind of method of the movable part for dry transformer has been described in German patent application DE19501323A1.Transformer is connected in vacuum pump, and winding provides the low frequency heating current that causes solid insulation in transformer, thereby removes gas content or water content.

In high-power transformer assembling process, may change its size and position for avoiding being exposed to large electric current coil of lower time, coil is conventionally compressed.

Summary of the invention

Target of the present invention is to provide than the method for the more effective assembling piezoelectric transformer of art methods.

Embodiments of the present invention relate to the method for assembling piezoelectric transformer, comprise the following steps:

-by electric coil and transformer coil in conjunction with to form electromagnetic component;

-coil with press is provided;

-in drying oven, make that electromagnetic component is dry and press applies mechanical pressure to coil simultaneously;

-during completing drying steps or afterwards, at least one is suitable for preventing that coil from increasing its big or small mechanical organ to offer coil; And

-after described at least one mechanical organ guarantees that the mechanical pressure previously being provided by press is stably maintained, press is removed from coil.

The advantage of this execution mode is dry and compresses both and can carry out simultaneously.Therefore assembling can be carried out saving time very much and be cost-saving.

In addition, the assembling of contrast prior art, coil exposed dry and compression can significantly shorten in the time of surrounding air.By electromagnetic component, after drying oven removes, electromagnetic component can be inserted in transformer container immediately, and after electromagnetic component inserts, described transformer container can be full of oil or be drained.Because coil is compressed when the dry run and be ready for the last assembling in transformer container, therefore without in surrounding air at stove external compression coil.

Electric coil and transformer core combination can be comprised coil is arranged on to the step on transformer core or transformer core is arranged on to the step on coil with the step of formation electromagnetic component.

Preferably, at least one mechanical organ is arranged in drying oven.

In drying steps process, coil can its size of slight modification.This impact can be by being used adjustable press (tunable press) to process.Adjustable press can produce in time the mechanical pressure of the restriction of passing, though coil in dry run along with the time changes its size.

Preferably, hydraulic press is used for applying mechanical pressure.Hydraulic press can comprise cylinder pressure and control unit, and this control unit is controlled the pressure that is applied to coil in the time that coil is dried.

According to preferred embodiment, thereby press is controlled during the step of dry coil and is applied the mechanical pressure invariable along with passage of time.

According to another preferred embodiment, thus press controlled during the step of dry coil along with mechanical pressure is changed in passage of time.For example, during drying steps, can apply predetermined pressure distribution.Predetermined pressure distribution can be processed the size variation of the expection of coil during drying steps.

Preferably, monitored by press institute applied pressure.Thereby this is controlled press to make pressure maintain predeterminated level or the given pressure distribution along with passage of time is provided.

In addition, in the time that mechanical pressure is applied by press and coil is dried, the large I of coil is measured.Can adapt to like this pressure on coil, thus the predetermined coil size after realizing drying steps and completing.

The step of dry electromagnetic component can at least temporarily be carried out in the kerosene that contains gas or in vacuum.Like this, at least those press parts that contact with coil preferably resistance to kerosene and/or vacuum-resistant.

For guaranteeing that the mechanical pressure previously being provided by press can be comprised pull bar and/or chock by the mechanical organ of stable maintenance.

The step that forms electromagnetic component is preferably incorporated in drying oven and in electromagnetic component, provides closed magnetic circuit before dry beginning.

Accompanying drawing explanation

In order to be easier to understand the method that obtains above-mentioned and other advantage of the present invention, the present invention who gives above summary with reference to the specific implementations of the present invention representing is in the accompanying drawings more precisely bright.Should be understood that, these accompanying drawings have only been described exemplary embodiment of the present invention, therefore should not be considered to limit its scope, by using accompanying drawing by feature other description and interpretation the present invention and details.

Fig. 1 to 7 expression is according to first of method of the present invention the representational execution mode;

Fig. 8 represents the first variant with the method as shown in Fig. 1 to 7 of representational mode;

Fig. 9 represents the second variant with the method as shown in Fig. 1 to 7 of representational mode; With

Figure 10 to 11 expression is with the third variant of the method as shown in Fig. 1 to 7 of representational mode.

Embodiment

By reference to accompanying drawing, the preferred embodiment of the present invention will obtain best understanding, and wherein identical or comparable part is represented by identical Reference numeral in the whole text.

Understandable, roughly, as described in accompanying drawing herein and represent, the present invention can change in wide region.Therefore, as shown in Fig. 1 to 11, below the description more specifically of the representative execution mode of the present invention be not intended to limit the scope of the invention, desired in claim, and only represent that the present invention is preferred embodiment at present.

Fig. 1 is illustrated in E shape transformer core 10 in representational pattern.The shape of transformer core can change in wide region.Like this, only selected the shape shown in Fig. 1 for illustrated object, and this shape can be replaced by any other core shape.For example, the in the situation that of polyphase transformer, can differentially select core shape, to hold requisite number object coil.

Explain and illustrate the assembling of transformer below with reference to single coil, described single coil represents all coils of each transformer.

Coil 20 is installed in the mid portion 11 of transformer core 10, makes the mid portion 11 of transformer core penetrate coil 20 (seeing Fig. 2).Coil 20 can comprise the further not concrete winding representing and secondary winding.

For closed magnetic circuit is provided, E shape transformer core 10 is provided with the I core element 30 (seeing Fig. 3) at the top that is placed on E shape transformer core 10.If electric current flows through the winding of coil 20, will produce the magnetic flux schematically showing as Reference numeral 40.

Before compression, the initial size of coil 20 is represented by Reference numeral H.

Then the synthetic electromagnetic component 50 that, comprises E shape transformer core 10, I shape transformer element 30 and coil 20 is through drying steps.Preferably, drying steps is combined with the step of collapse coil 20, thereby two steps are carried out simultaneously.

For this reason, adjustable press 60 is attached to coil 20.Preferably, press 60 is the hydraulic presses that comprise cylinder pressure 61 and control unit 62.Control unit 62 is controlled by 61 applied pressures of cylinder pressure and the therefore compressed degree of regulating winding 20.The size of compressed coil 20 is represented by Reference numeral h in Fig. 4 (h < H).

Then, electromagnetic component 50 is moved into as shown in Figure 5 in drying oven 70.In order to make the hydraulic press 60 can collapse coil 20, whole press 60 can be moved into as shown in Figure 5 in drying oven 70.

Alternately, those that only have press 60 have the part that direct physical contacts can be moved in drying oven 70 with coil 20.Fig. 8 and 9 represents alternative execution mode.

In Fig. 8, cylinder pressure 61 and depression bar 63 are placed in drying oven 70 inside and control unit 62 is placed in outside.

In Fig. 9, only have depression bar 63 to be placed in drying oven inside, and cylinder pressure 61 and control unit 62 are placed in outside.

Be apparent that, discussed above by attached hydraulic press 60 and can be contrary by the order that electromagnetic component 50 is moved into the step in drying oven 70.For example, for example, before hydraulic press 60 entirety or its part (depression bar 63 and/or cylinder pressure 61) are installed on coil 20, electromagnetic component 50 can be moved in drying oven 70.

During completing drying steps or afterwards, mechanical organ 80 is attached to coil 20.And if in the time that hydraulic press 20 separates with coil 20, these mechanical organs 80 stop coil 20 to increase its size.In other words, mechanical organ 80 guarantees that the mechanical pressure previously being provided by hydraulic press 60 does not obtain maintaining not interruption.

Mechanical organ 80 can be attached in drying oven 70 or its outside, and this depends on where press 60 or its part are removed.Fig. 6 and 7 is illustrated in removing of the outside press 60 of drying oven 70 or its part.The transformer being assembled is represented by Reference numeral 100.

Figure 10 and 11 is illustrated in removing of the inner press 60 of drying oven 70 or its part.In this case, before press separates, mechanical organ 80 is attached to electromagnetic component 50.

Claims

1. the method for assembling piezoelectric transformer (100), comprises the following steps:

-by electric coil (20) and transformer coil (10) in conjunction with to form electromagnetic component (50);

-the have press coil (20) of (60) is provided;

-in drying oven (70), make that electromagnetic component (50) is dry and press (60) applies mechanical pressure to coil (20) simultaneously;

-during completing drying steps or afterwards, at least one is suitable for preventing that coil (20) from increasing its big or small mechanical organ (80) to offer coil (20); And

-guarantee that at described at least one mechanical organ (80) mechanical pressure previously being provided by press (60) is stably maintained after, press (60) is removed from coil (20).

2. method according to claim 1, wherein said at least one mechanical organ (80) is arranged in drying oven (70).

3. method according to claim 1, wherein

-use adjustable press (60), and

-adjustable press (60) thus the adjusted mechanical pressure producing along with the restriction of passage of time.

4. according to the method described in any one of aforementioned claim,

-wherein hydraulic press (60) is for applying described mechanical pressure, and described hydraulic press (60) comprises cylinder pressure (61) and control unit (62), and

-wherein in the time that coil (20) is dried described in control unit (62) control and be applied to the pressure of described coil (20).

5. according to the method described in any one of aforementioned claim, wherein press (60) thus controlled during the step of dry coil (20) and applied the mechanical pressure invariable along with passage of time.

6. according to the method described in any one of aforementioned claim, wherein press (60) thus controlled during the step of dry coil (20) along with passage of time change mechanical pressure.

7. according to the method described in any one of aforementioned claim, wherein monitored by press (60) institute applied pressure, and press (60) thus controlled and make pressure maintain predeterminated level.

8. according to the method described in any one of aforementioned claim, wherein, in the time that mechanical pressure is applied by press (60) and coil (20) is dried, the size of coil (20) is measured.

9. according to the method described in any one of aforementioned claim,

The step of-wherein said dry electromagnetic component (50) is at least temporarily carried out in the kerosene that contains gas, and

-wherein at least those parts that contact with coil (20) of press (60) are resistance to kerosene.

10. according to the method described in any one of aforementioned claim, wherein at least one pull bar (63) and/or at least one chock are mounted, thereby the mechanical pressure previously being provided by press (60) is provided.

11. according to the method described in any one of aforementioned claim, and the step of wherein said formation electromagnetic component (50) is included in drying oven (70) and in electromagnetic component (50), provides closed magnetic circuit (40) before dry beginning.