EP2721620B1 - Winding arrangement with coil windings and system of cooling channels - Google Patents

Description

The invention relates to a winding arrangement with coil windings and a cooling duct system for an electrical apparatus, preferably for an oil-filled throttle or a transformer.

The flow of the coolant is forced in such windings either by a pump (OD / OF cooling) or takes place automatically due to the thermally induced density change of the cooling liquid (ON cooling). The heated in the winding cooling liquid increases due to the lower specific volume weight compared to the surrounding amount of liquid and is replaced by flowing from below cooling liquid.

Such windings are preferably designed as coil or disc windings in which the cooling channels are arranged radially.

In a large number of applications, it is advantageous to use such windings with radially arranged cooling channels (winding axis parallel to the ground).

The problem with this is that from a certain radial width of the winding in radially extending largely horizontally disposed cooling channels sufficient natural oil circulation can no longer be ensured.

CH 297561 A discloses a liquid-cooled transformer whose windings are molded in synthetic resin, this resin insulation being cooled with water.

GB 937161 A discloses a liquid cooled device, e.g. B, an oil transformer having a cooling channel structure, which defines coolant paths and comprises a plurality of cells arranged one above the other.

US 4000482 A discloses a liquid cooled electrical transformer having a disc or pancake transformer winding and a cooling channel structure for producing vertically and radially directed coolant liquid flows.

US 2002/0024262 A1 discloses a winding structure of a winding arranged between two coaxial cylinders of an electrical induction device. The winding comprises a plurality of disc windings arranged one behind the other in an axial direction, which are arranged to each other and spaced from the cylinders for generating vertically and axially directed coolant flows between the cylinders.

EP 0040262 A1 discloses an electrical coil assembly with radially spaced coil windings for generating coolant flows extending radially between the coil turns.

EP 0582218 A1 discloses a choke coil for a power converter with two parallel and immediately juxtaposed, tubular winding carriers, which carry a winding consisting of two partial windings, wherein the winding support serve as a cooling body for cooling the inner choke coil with an electrically conductive cooling liquid.

It is an object of the invention to provide an improved winding arrangement with coil windings and a cooling channel system for the cooling thereof.

The object is achieved by the features specified in claim 1.

Advantageous embodiments of the invention are the subject of the dependent claims.

The winding arrangement according to the invention comprises at least one coil winding and a cooling channel system for receiving a coolant for cooling the coil winding. The coil windings are wound around an x-axis extending in an x-direction. Between turns of the coil winding cooling channels of the cooling channel system are arranged. The cooling channel system is designed in such a way that, with suitable alignment of the winding arrangement in the earth gravity field and filling of the cooling channel system with the coolant, heating of the coil windings generated by current flow causes a convection flow of the coolant through all the cooling channels of the cooling channel system.

The term coil windings here not only coil windings in the literal sense, but also disc windings.

According to the invention, a flow of the coolant is thus generated solely by its heating by the coil windings. This is achieved by the design of the cooling channel system. This has the advantage that no further devices for generating a flow of the coolant are required. In particular, no pumps for generating a coolant flow are required.

As a result, the construction of the winding arrangement is considerably simplified and cheaper compared to winding arrangements with cooled coil windings known from the prior art. In addition, the operational safety of the winding assembly is increased, since the elimination of separate devices for generating a coolant flow also eliminates the risk of failure of such devices.

The design of the cooling channel system for the flow through all cooling channels of the cooling channel system advantageously avoids local overheating of coil windings and thus reduces the risk of damage and loss of function of the winding assembly by such overheating.

In a preferred embodiment of the winding arrangement, the cooling channels are arranged on a carrier body. Furthermore, the cooling channel system has at least one storage chamber arranged in the interior of the carrier body, and each storage chamber is connected to cooling channels via connecting channels.

In the storage chambers sufficient coolant can be provided for cooling the coil windings. About the connecting channels, the coolant can be supplied from the storage chambers to the cooling channels or distributed to these and removed from them. This allows a coolant circulation within the cooling channel system, which causes a cooling of the coil windings according to the invention.

Preferably, each cooling channel is arranged on an outer side of the carrier body. As a result, on the one hand, the cooling of the coil windings can be advantageously improved by thermal contact of the cooling ducts with the surroundings of the winding arrangement. On the other hand, the cooling channels can be arranged in a simple and efficient manner around the storage chambers in the interior of the carrier body and connected to them.

Of each storage chamber, preferably at least one first connection channel, which extends at least approximately in a z-direction, and at least one second connection channel, which extends at least approximately in a y-direction orthogonal to the z-direction and the x-direction, exit. This geometric arrangement of the outgoing from the storage chambers connecting channels makes it possible advantageously, resulting from heating the coil windings buoyancy to use within the coolant to flow through all the cooling channels of the cooling channel system by the gravitational field in the earth's gravity field is aligned with the z-direction in the direction of gravity.

In this case, all the second connection channels emanating from storage chambers preferably extend at least approximately in the y-direction. This allows a geometrically simple and convenient design of the connecting channels for the passage of the cooling channels with the coolant.

In a preferred embodiment of the cooling channel system, first and second connection channels are connected to the cooling channels via third connecting channels extending in the x-direction. The third connection channels advantageously support the distribution of the coolant to the cooling channels, in particular in the x-direction.

In a particularly preferred embodiment, the cooling channel system has at least two storage chambers and the storage chambers are arranged one behind the other along the x-direction. By a plurality of successively arranged storage chambers, the flow of coolant through the cooling channel system is improved by the cooling channel system is advantageously segmented.

In this embodiment, the outgoing from adjacent storage chambers first and second connection channels are preferably arranged offset from one another. As a result, the flows from and to adjacent storage chambers complement one another in an advantageous manner in that cooling ducts, which are supplied less by one storage chamber, are better supplied by an adjacent storage chamber.

The carrier body is preferably cylindrical in shape with a cylinder axis extending in the x-direction. This advantageously allows a geometrically simple construction of a winding arrangement according to the invention.

Furthermore, the carrier body preferably comprises a plurality of hollow cylinder segments whose cavities each form a storage chamber and are separated from one another by separating disks, wherein the first and second connecting channels extending from the storage chambers are openings in the hollow cylinder walls of the hollow cylinder segments. In this way, the above-described particularly preferred embodiment of the winding arrangement can be realized in a simple manner with a plurality of successively arranged storage chambers.

Alternatively, an inner body is arranged within the carrier body and the storage chambers are separated by separating disks between the carrier body and the inner body. This embodiment also realizes the particularly preferred embodiment of the winding arrangement with a plurality of storage chambers arranged one behind the other. This refinement can be used particularly advantageously, for example as a winding arrangement for transformers, in particular vehicle transformers. As a carrier body or inner body, for example, electrical barrier arrangements for high voltage insulation are. If high-voltage only a high-voltage barrier is required, as an inner body, for example, advantageously a transformer core can be used.

The inner body is for example cylindrical. This is particularly advantageous in conjunction with a likewise cylindrical carrier body, since then uniformly shaped storage chambers arise in the spaces between the two bodies.

According to the invention, therefore, a winding arrangement is proposed in which, by combining differently oriented channels (cooling channels, connecting channels) and other coolant chambers (storage chambers), channels with strong flow drive (largely vertical channels) and channels with unfavorable coolant drive (largely horizontal channels) be summarized to a flow channel. Through this interlinkage of channels, the flow of the coolant through the winding arrangement is made uniform and excessive heating of parts of the winding is avoided by stagnation of the flow in the largely horizontal channels is avoided.

The above-described characteristics, features, and advantages of this invention, as well as the manner in which they will be achieved, will become clearer and more clearly understood in connection with the following description of an embodiment which will be further described in connection with the accompanying drawings.

FIG 1

eine perspektivische Darstellung einer Wicklungsanordnung mit einem zylinderförmigen Trägerkörper,

FIG 2

eine perspektivische Teildarstellung einer Wicklungsanordnung mit einem zylinderförmigen Trägerkörper,

FIG 3

eine perspektivische Darstellung eines zylinderförmigen Trägerkörpers mit Axialleisten,

FIG 4

eine perspektivische Darstellung einer Trennscheibe und deren Befestigung zur Aufteilung eines zylindrischen Hohlraumes in zwei Speicherkammern,

FIG 5

einen Längsschnitt durch eine Wicklungsanordnung mit einem zylinderförmigen Trägerkörper und drei Speicherkammern,

FIG 6

einen Querschnitt durch eine Wicklungsanordnung mit einem zylinderförmigen Trägerkörper in einer Schnittebene durch eine erste Speicherkammer,

FIG 7

einen Querschnitt durch eine Wicklungsanordnung mit einem zylinderförmigen Trägerkörper in einer Schnittebene durch eine zweite Speicherkammer,

FIG 8

eine Draufsicht auf einen in eine Ebene abgewickelten zylinderförmigen Trägerkörper mit zwei Speicherkammern,

FIG 9

eine Draufsicht auf einen in eine Ebene abgewickelten zylinderförmigen Trägerkörper mit drei Speicherkammern,

FIG 10

eine Draufsicht auf einen in eine Ebene abgewickelten zylinderförmigen Trägerkörper mit vier Speicherkammern,

FIG 11

einen Querschnitt durch eine Wicklungsanordnung mit einem zylinderförmigen Trägerkörper ohne dritte Verbindungskanäle in einer Schnittebene durch eine erste Speicherkammer,

FIG 12

einen Querschnitt durch eine Wicklungsanordnung mit einem zylinderförmigen Trägerkörper ohne dritte Verbindungskanäle in einer Schnittebene durch eine zweite Speicherkammer,

FIG 13

einen Querschnitt durch eine Wicklungsanordnung mit einem zylinderförmigen Trägerkörper und einem Innenkörper in einer Schnittebene durch eine erste Speicherkammer, und

FIG 14

einen Querschnitt durch eine Wicklungsanordnung mit einem zylinderförmigen Trägerkörper und einem Innenkörper in einer Schnittebene durch eine zweite Speicherkammer.

Showing:

FIG. 1

a perspective view of a winding arrangement with a cylindrical carrier body,

FIG. 2

a partial perspective view of a winding arrangement with a cylindrical carrier body,

FIG. 3

a perspective view of a cylindrical carrier body with axial bars,

FIG. 4

a perspective view of a cutting disc and its attachment for dividing a cylindrical cavity in two storage chambers,

FIG. 5

a longitudinal section through a winding arrangement with a cylindrical carrier body and three storage chambers,

FIG. 6

a cross section through a winding arrangement with a cylindrical carrier body in a sectional plane through a first storage chamber,

FIG. 7

a cross section through a winding arrangement with a cylindrical carrier body in a sectional plane through a second storage chamber,

FIG. 8

a plan view of an unwound in a plane cylindrical support body with two storage chambers,

FIG. 9

a top view of an unwound in a plane cylindrical support body with three storage chambers,

FIG. 10

a top view of an unwound in a plane cylindrical support body with four storage chambers,

FIG. 11

a cross section through a winding arrangement with a cylindrical carrier body without third connecting channels in a sectional plane through a first storage chamber,

FIG. 12

a cross section through a winding arrangement with a cylindrical carrier body without third connecting channels in a sectional plane through a second storage chamber,

FIG. 13

a cross section through a winding assembly having a cylindrical support body and an inner body in a sectional plane through a first storage chamber, and

FIG. 14

a cross section through a winding assembly having a cylindrical support body and an inner body in a sectional plane through a second storage chamber.

Corresponding parts are provided in all figures with the same reference numerals.

FIG. 1 and FIG. 2 show a perspective view and partial representation of a first embodiment of a winding arrangement A according to the invention. The winding arrangement A comprises a coil winding 1, a hollow cylindrical carrier body 2 and a cooling channel system which is filled with a cooling oil as a coolant for cooling the coil windings 1.

The coil winding 1 extends helically about a longitudinal axis (cylinder axis) of the carrier body 2 on the outside thereof.

The cooling channel system comprises cooling channels 40, which are each arranged between adjacent turns of the coil winding 1, a storage chamber 20, which is formed by the cavity in the interior of the carrier body 2, and connecting channels 51, 52, 53, via which the storage chamber 20 with the cooling channels 40 connected is.

First connecting channels 51 and second connecting channels 52 are openings in the hollow cylinder wall of the carrier body 2. In this case, the first connecting channels 51 extend at least approximately in a z-direction which is orthogonal to an x-direction which is defined by the longitudinal axis (cylinder axis) of the carrier body 2 becomes. The second connection channels 52 extend at least approximately in a y-direction which is orthogonal to the x-direction and the z-direction. The first and second connecting channels 51, 52 lead from the storage chamber 20 through the hollow cylinder wall of the carrier body 2 to third connecting channels 53 which extend on the outer surface of the carrier body 2 in the x direction.

The third connection channels 53 are separated from each other by lying on the outer surface of the support body 2, extending in the x-direction axial strips 3 and regularly distributed over the entire outer surface of the support body 2.

The cooling channels 40 each adjoin a third connecting channel 53 and are spaced therefrom by the outer surface of the carrier body 2. They run in a yz plane in each case radially from a third connecting channel 53 to the outside. In the yz plane, the cooling channels 40 are separated from each other by separating strips 4, each resting on an axial strip 3 and extending radially outwardly therefrom between adjacent turns of the coil winding 1.

FIG. 3 shows a perspective view of the carrier body 2 in the Figures 1 and 2 shown winding assembly A with arranged on the support body 2 Axialleisten 3rd

The in the FIGS. 1 to 3 shown winding assembly A is intended to be aligned in the gravitational field with the z-direction in the direction of gravity. The cooling channel system is designed such that, in such an orientation, heating of the coil winding 1, which is generated by a flow of current through the coil winding 1, causes a convection flow of the cooling oil through all the cooling channels 40 of the cooling channel system. The convection flow is generated by a buoyancy, which is caused by the heating of the coil winding 1 in the cooling oil. The arrangement in particular of the first and second connecting channels 51, 52 and their approximate course in the z- or y-direction thereby ensure that all cooling channels 40 are included in the flow of the cooling oil. To promote such flow, the second communication passages 52 are preferably not made to run exactly in the y-direction, but slightly different, so that they each allow an upward component of the flow.

An embodiment of the in the FIGS. 1 to 3 illustrated first embodiment, instead of a coil winding 1, a plurality of such coil windings 1, whose Windings, for example, offset from each other or intertwined.

With regard to the design of the cooling channel system, the same applies to the following with reference to the FIGS. 4 to 14 described embodiments of inventive winding arrangements A. These also have approximately in the z- or y-direction extending first and second connecting channels 51, 52, which allow a convection flow through all the cooling channels 40 when the coil windings 1 are traversed by electric current and the respective winding assembly A in Erdschwerefeld with the z Direction is oriented in the direction of gravity. The winding arrangements A of these embodiments also each have a cylindrical carrier body 2. However, they differ from the first embodiment in that a plurality of storage chambers 21, 22, 23, 24 along the longitudinal axis (cylinder axis) of the carrier body 2 are arranged one behind the other in the interior of the carrier body 2 for further improving the convection flow of the cooling oil. The longitudinal axis of the carrier body 2 in each case defines an x-direction. The y and z directions refer to the x-direction and mutually orthogonal directions.

FIG. 4 shows a perspective view of a cutting disc 5 for dividing a cylindrical cavity within a cylindrical carrier body 2, not shown here in two storage chambers 21, 22. The separating disk 5 is arranged by means disposed along the longitudinal axis of the support body 2 mounting rod 6 on a support device 7 of Carrier body 2 attached. The fastening rod 6 can be omitted if the cutting disc 5 is connected at its outer edge with the inner surface of the carrier body 2.

FIG. 5 shows a longitudinal section in an xz plane by a second embodiment of a winding assembly A. The Winding arrangement A has a cylindrical carrier body 2 with three storage chambers 21, 22, 23, which are each formed as a cavity of a hollow cylinder segment within the carrier body 2. Adjacent storage chambers 21, 22, 23 are each separated by a cutting disc 5 from each other.

From each storage chamber 21, 22, 23 go at least approximately at least approximately in the z-direction extending first connecting channels 51 and a plurality of at least approximately in the y-direction extending second connecting channels 52, which are each formed as an opening in the hollow cylinder wall of the respective hollow cylinder segment. As in the first embodiment, the first and second connection channels 51, 52 are each connected to a third connection channel 53. Like in the first exemplary embodiment, the third connection channels 53 extend in the x-direction on the outer surface of the carrier body 2 and are connected to outwardly adjoining cooling channels 40 in which coil windings 1 are arranged.

The first connection channels 51 and the second connection channels 52 of adjacent storage chambers 21, 22, 23 are each arranged offset from one another. As a result, the convection flow of the cooling oil is advantageously further improved.

The FIGS. 6 and 7 each show a cross section in a yz plane through the in FIG. 5 shown winding arrangement A, wherein the cutting plane in FIG. 6 passes through a first storage chamber 21 and the cutting plane in FIG. 7 through a first storage chamber 21 adjacent the second storage chamber 22 extends. Shown are also the directions of the convection flow of the cooling oil through the first and second connection channels 51, 52 which are arranged offset in the two storage chambers 21, 22 to each other.

The FIGS. 8 to 10 each show a plan view of a cut along an x-direction and into a xy-plane developed cylindrical support body 2 of embodiments of winding arrangements A, which differ by the number of storage chambers 21, 22, 23, 24 and the number and / or distribution of first and second connection channels 51, 52, but otherwise in each case the FIGS. 5 to 7 illustrated embodiment example correspond. Also shown is the position of the cutting discs 5, which separate the storage chambers 21, 22, 23, 24 from each other. As in the in the FIGS. 5 to 7 In the embodiment shown, the first and second connection channels 51, 52 of adjacent storage chambers 21, 22, 23, 24 are arranged offset to one another.

The FIGS. 11 and 12 each show a cross section in a yz plane through a winding arrangement A according to a further embodiment. This embodiment differs from that in the FIGS. 5 to 10 illustrated embodiments essentially in that the winding assembly A has no third connection channels 53, but the first and second connection channels 51, 52 are connected directly to the cooling channels 40. Apart from that, the winding arrangement A is analogous to that in the FIGS. 5 to 10 formed embodiments illustrated. In particular, it has a plurality of storage chambers 21, 22, 23, 24, wherein the first and second connection channels 51, 52 emanating from adjacent storage chambers 21, 22, 23, 24 are arranged offset relative to one another. FIG. 11 shows a cross section, the sectional plane through a first storage chamber 21 extends. FIG. 12 shows a cross section, the sectional plane through one of the first storage chamber 21 adjacent the second storage chamber 22 extends.

The FIGS. 13 and 14 each show a cross section in a yz plane through a winding arrangement A according to a further embodiment. Like that in the FIGS. 11 and 12 illustrated embodiment, this embodiment also has no third connection channels 53. The difference to that in the FIGS. 11 and 12 illustrated embodiment consists in the formation of the storage chambers 21, 22, 23, 24. Within the carrier body 2, a cylindrical inner body 8 is arranged, the cylinder axis coincides with the cylinder axis of the carrier body 2. The storage chambers 21, 22, 23, 24 are formed in this embodiment of spaces between the support body 2 and the inner body 8, which are separated from each other by annular cutting discs 5. Apart from that, the winding arrangement A is analogous to that in the FIGS. 11 and 12 illustrated embodiment formed. FIG. 13 shows a cross section, the sectional plane through a first storage chamber 21 extends. FIG. 14 shows a cross section, the sectional plane through one of the first storage chamber 21 adjacent the second storage chamber 22 extends.

In the in the FIGS. 13 and 14 illustrated embodiment are suitable as a carrier body 2 and / or inner body 8, for example, electrical barrier arrangements for high voltage insulation. This embodiment can be used particularly advantageously as a winding arrangement for vehicle transformers. If high voltage only a high voltage barrier is required, can be used as inner body 8, for example, advantageously the core of a transformer.

In all described embodiments, an outside area around the cooling channels 40 and coil windings 1 can also be designed as a region of the cooling channel system that can be filled with coolant and connected to the cooling channels 40.

Although the invention has been further illustrated and described in detail by way of a preferred embodiment, the invention is not limited by the disclosed examples, and other variations can be derived therefrom by those skilled in the art without departing from the scope of the invention.

Claims (9)

1. Winding arrangement (a) having at least one coil winding (1) which is wound about an x axis running in an x direction, and a cooling duct system for receiving a coolant for cooling the coil winding (1), wherein

   - cooling ducts (40) of the cooling duct system are arranged between turns of the coil winding (1), and the cooling duct system is embodied in such a way that given the suitable orientation of the winding arrangement (A) in the Earth's gravitational field and filling of the cooling duct system with the coolant, heating of the coil winding (1) which is generated by a current flow brings about a convection flow of the coolant through all the cooling ducts (40) of the cooling duct system,

   - each coil winding (1) and the cooling ducts (40) are arranged on an outer side of a carrier body (2),

   - the cooling duct system has at least one storage chamber (20, 21, 22, 23, 24) which is arranged in the interior of the carrier body (2),

   - and each storage chamber (20, 21, 22, 23, 24) is connected to cooling ducts (40) by connecting ducts (51, 52, 53).
2. Winding arrangement (A) according to Claim 1,
   wherein at least a first connecting duct (51), which runs at least approximately in a z direction which is orthogonal with respect to the x direction, and at least a second connecting duct (52), which runs at least approximately orthogonally with respect to the z direction and the x direction, proceeds from each storage chamber (20, 21, 22, 23, 24).
3. Winding arrangement (A) according to Claim 2,
   wherein first and second connecting ducts (51, 52) are connected to cooling ducts (40) via third connecting ducts (53) which run in the x direction.
4. Winding arrangement (A) according to one of the preceding claims,
   wherein the cooling duct system has at least two storage chambers (20, 21, 22, 23, 24), and the storage chambers (20, 21, 22, 23, 24) are arranged one behind the other along the x direction.
5. Winding arrangement (A) according to Claim 4,
   wherein the first and second connecting ducts (51, 52) which proceed from adjacent storage chambers (20, 21, 22, 23, 24) are arranged offset with respect to one another.
6. Winding arrangement (A) according to one of the preceding claims,
   wherein the carrier body (2) is embodied in a cylindrical shape with a cylinder axis which runs in the x direction.
7. Winding arrangement (A) according to Claim 6,
   wherein the carrier body (2) comprises a plurality of hollow cylinder segments, the cavities of which each form a storage chamber (20, 21, 22, 23, 24) and are separated from one another by separating disks (5), and in that the first and second connecting ducts (51, 52) which proceed from the storage chambers (20, 21, 22, 23, 24) are openings in the hollow cylinder walls of the hollow cylinder segments.
8. Winding arrangement (A) according to one of the preceding claims,
   wherein an internal body (8) is arranged inside the carrier body (2), and the storage chambers (20, 21, 22, 23, 24) are intermediate spaces, separated from one another by separating disks, between the carrier body (2) and the internal body (8).
9. Winding arrangement (A) according to Claim 8,
   wherein the internal body (8) is embodied in the form of a cylinder.

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