CN205487752U - Special high voltage transformers's pin connection structure and special high voltage transformers - Google Patents

Abstract

The utility model discloses a lead wire connection structure of an extra high voltage transformer and the extra high voltage transformer. In the lead wire connection structure of the UHV transformer, the UHV transformer adopts a double-column parallel structure, wherein the winding direction of the I-column winding in the double-column is right-winding, and the winding direction of the II-column winding is left-winding , the lead wire of the II-column winding includes four sections connected in sequence, that is, the lead-out section after being drawn out from the II-column winding, the transition section between the I-column winding and the II-column winding, and the continuous winding on the I-column winding section, and the meeting section that meets the lead wire of the I column winding, the meeting section of the lead wire of the II column winding is drawn out in parallel with the lead wire of the I column winding, and the transition section of the lead wire of the II column winding is connected to the center line of the body between the two columns The distance is close. With this lead wire connection structure, the insulation distance between the lead wires between the double columns in the UHV transformer and the inner wall of the oil tank can be better ensured without additionally increasing the internal space of the oil tank, thereby greatly saving the manufacturing cost of the transformer and transportation cost.

Description

Lead connection structure of UHV transformer and UHV transformer

technical field

The utility model belongs to the technical field of transformer manufacturing, in particular to a lead wire connection structure of an extra-high voltage transformer and an extra high voltage transformer including the lead wire connection structure.

Background technique

With the rapid development of the country's UHV power transmission and transformation industry, the development of 1000kV transformers is becoming more and more rapid. The 1000kV generator transformer is the voltage that directly increases the output voltage of the generator to the voltage of the 1100kV UHV transformer. The use of 1000kV generator transformer can greatly reduce power transmission equipment, so it is one of the key equipment of AC UHV transmission network.

For such ultra-large-capacity UHV transformers, limited by transportation conditions, 1000kV generator transformers usually need to adopt a single-phase double-column parallel structure to meet transportation requirements. Due to the limited space between the two columns of the 1000kV generator transformer, and the connection position of the UHV lead wire between the two columns is a high voltage and high electric field part, the connection method of the lead wire is very critical. Improper handling will cause the local electric field to be too high, resulting in partial transformer failure. If the discharge is too large, it will cause the transformer to break down and discharge more seriously. If the traditional lead wire connection method is used to meet the insulation distance from the lead wire of the 1000kV transformer to the tank wall, the space in the oil tank will increase a lot, and its manufacturing cost and transportation cost will increase a lot.

Utility model content

The technical problem to be solved by the utility model is to provide a lead wire connection structure of an UHV transformer and an UHV transformer including the lead wire connection structure for the above-mentioned deficiencies in the prior art. The lead wire connection structure can be used without additional On the premise of increasing the internal space of the oil tank, the insulation distance between the lead wires between the double columns in the UHV transformer and the inner wall of the oil tank can be better ensured, thereby greatly saving the manufacturing cost and transportation cost of the transformer.

The technical solution adopted to solve the technical problem of the utility model is the lead wire connection structure of the UHV transformer. The UHV transformer adopts a double-column parallel structure, wherein the winding direction of the I-column winding in the double-column is right-hand winding, and the II-column winding direction is the right winding direction. The winding direction of the column winding is the left winding direction, and the lead wire of the II column winding includes four sections connected in sequence, that is, the lead section after being drawn out from the II column winding, the transition section between the I column winding and the II column winding, and the continuation The continuous winding section wound on the I column winding, and the meeting section meeting the lead wire of the I column winding, the meeting section of the lead wire of the II column winding is drawn out in parallel with the lead wire of the I column winding, and the transition of the lead wire of the II column winding The distance between the segment and the centerline of the body between the double columns is close.

Preferably, the winding direction of the continuous winding section of the lead wire of the II-column winding on the I-column winding is opposite to that of the I-column winding.

Preferably, the length of the continuation section of the lead wire of the II-column winding is 1/8-1/6 of the circumference of the outermost layer of the I-column winding.

Preferably, a space is reserved on the outermost circumference of the first wire cake at the head end of the I-column winding, and the lead wire of the II-column winding is wound at the space.

Further preferably, the transition section of the lead wire of the II-column winding is parallel to the center line of the double-column.

The utility model also provides an ultra-high voltage transformer, which adopts a double-column parallel structure, and the ultra-high voltage transformer adopts the above-mentioned lead wire connection structure.

Preferably, the UHV transformer includes an oil tank, the double columns are arranged inside the oil tank, a partition is provided between the inner wall of the oil tank and the double columns, and the transition section of the lead wire of the II column winding is at the center of the partition and the double columns between the lines.

Specifically, the lead wire connection structure of the present invention has the following beneficial effects:

The utility model preferably solves the connection mode of the lead wires between the double columns of the transformer with a double-column parallel connection structure with extra large capacity. In adopting this lead connection structure, by specifying the respective winding directions of the two columns, and making the lead wire of one column continue to wind on the other column after being drawn out, the UHV lead wire between the two columns can be very close to the double column. The center line of the body between the columns, so the lead wires can be placed in a relatively uniform ultra-high voltage electric field, which effectively improves the electric field strength at the connecting lead wires. Moreover, the use of the lead wire connection structure makes the shielding measures of the lead wires and the wrapping treatment of the lead wire insulation all simpler, more convenient to operate, and higher in reliability than the traditional connection method. More importantly, the use of this lead wire connection method can better ensure the insulation distance between the UHV lead wires between the two columns and the inner wall of the fuel tank without additionally increasing the internal space of the fuel tank, which greatly saves the manufacturing of the transformer. costs and shipping costs.

The lead wire connection structure of the ultra-high voltage transformer of the utility model is particularly suitable for 500-1000kV ultra-high voltage transformers.

Description of drawings

Fig. 1 is the structural schematic diagram of the lead wire connection structure of UHV transformer in the utility model embodiment;

Fig. 2 is a structural schematic diagram of the double-column connection of the UHV transformer in Fig. 1;

Figure 3 is the Q-Q view in Figure 2 (when the lead wire of the II column winding is on the I column winding side);

Fig. 4 is the P-P view among Fig. 2 (when the lead wire of II column winding is at II column winding side);

In the figure: 1-cold pressure tube; 2-transition section; 3-body angle ring; 4-partition; 5-body of Ⅰ column winding; 6-body of Ⅱ column winding; 7-body surrounding screen; 8-lead wire of Ⅱ column winding; 9-aluminum foil; 10-metallized insulating paper; 11-lead insulation layer; 12-corrugated cardboard; 13-lead molded parts.

detailed description

The technical solution in the utility model will be clearly and completely described below in conjunction with the accompanying drawings of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

The utility model provides a lead wire connection structure of an ultra-high voltage transformer. The ultra-high voltage transformer adopts a double-column parallel structure, wherein the winding direction of the I-column winding in the double-column is the right winding direction, and the winding direction of the II-column winding is In the left direction, the lead wire of the II column winding includes four sections connected in sequence, that is, the lead-out section after being drawn out from the II column winding, the transition section between the I column winding and the II column winding, and the wire that continues to be wound on the I column winding. The continuous winding section and the meeting section meeting the lead wire of the I column winding, the meeting section of the lead wire of the II column winding is drawn out in parallel with the lead wire of the I column winding, the transition section of the lead wire of the II column winding and the body between the two columns The distance from the centerline is close.

In addition, the utility model also provides an ultra-high voltage transformer, which adopts a double-column parallel structure, and the ultra-high voltage transformer adopts the above-mentioned lead wire connection structure.

In order to enable those skilled in the art to better understand the technical solution of the utility model, the utility model will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

Example:

This embodiment provides a 1000kV UHV transformer. The UHV transformer adopts a single-phase double-column parallel structure. Therefore, the UHV transformer includes two columns, which are the I-column winding and the II-column winding. The UHV transformer has two columns The lead wire connection structure between adopts the lead wire connection structure shown in Figure 1.

As shown in Figure 1, the winding directions of the I column winding and the II column winding in the double column are opposite, among which, the winding direction of the I column winding is the right winding direction, the winding direction of the II column winding is the left winding direction, and the winding direction of the II column winding is the left winding direction. The lead wire of the column winding includes four sections that are connected in sequence, that is, the lead-out section from the II column winding, the transition section between the I column winding and the II column winding, the continuation winding section that continues to be wound on the I column winding, And the meeting section that meets the lead wire of the I-column winding, and the meeting section of the lead wire of the II-column winding is drawn out in parallel with the lead wire of the I-column winding.

In this embodiment, the winding direction of the continuous winding section of the lead wire of the II-column winding on the I-column winding is opposite to that of the I-column winding, that is, the left winding direction. And the length of the continuous winding section of the lead wire of the II-column winding is 1/8-1/6 of the circumference of the outermost layer of the I-column winding. It is preferably 1/6 of the circumference of the outermost layer of the I-column winding.

Preferably, several space positions are reserved on the outermost circumference of the first wire cake at the head end of the I-column winding, so that the continuation of the lead wire of the II-column winding can be wound on this space position.

In this embodiment, the transition section 2 of the lead wire of the II column winding (that is, the dotted line segment A'A" in FIG. Parallel, and the distance between the transition section and the center line of the body between the double columns is close. Specifically, the UHV transformer includes an oil tank, and the double columns are all arranged in the oil tank, and the body 5 of the I column winding and There are multiple body screens 7 outside the body 6 of the II column winding. As shown in Figure 2, a partition 4 is provided between the inner wall of the fuel tank and the double column, and the partition 4 is placed on the two body screens of the double column In between, the transition section 2 of the lead wire of the II-column winding is set on the inner side of the partition 4, that is, between the partition 4 and the central connection line of the double columns.

Preferably, in this embodiment, in order to facilitate the process operation, the transition section 2 is actually a section extended from the end of the lead-out section and the head end of the continuation section, and the above-mentioned two extended sections are connected by the cold pressure tube 1. form. Of course, the transition section 2 can also be formed by extending a section from the end of the lead-out section and the first section of the continuation section, and then connecting the two sections by welding.

As shown in Figure 4, in this embodiment, for the part of the transition section 2 of the lead wire of the II column winding on the side of the II column winding, the cold pressure tube 1 is first crimped on the lead wire, and then on the cold pressure tube from inside to Outer covering aluminum foil 9 , metal crepe paper 10 , lead insulation layer 11 , multilayer corrugated cardboard 12 and multilayer lead forming layer 13 . Wherein, each layer of corrugated cardboard 12 and each layer of lead forming layer 13 are arranged at intervals on the lead insulating layer 11 . The purpose of wrapping aluminum foil 9 is to fill and round the lead wires 8 of the II-column winding.

Similarly, as shown in Figure 3, in this embodiment, for the part of the transition section 2 of the lead wire of the II column winding on the side of the I column winding, the cold pressure tube 1 is first crimped on the lead, and then on the cold pressure tube Cover aluminum foil 9 , metal crepe paper 10 , lead insulation layer 11 , multilayer corrugated cardboard 12 and multilayer lead forming layer 13 from inside to outside. Wherein, the metal surface of the metallized crepe paper 10 is close to the side of the aluminum foil, and each layer of corrugated cardboard 12 and each layer of lead forming layer 13 are arranged at intervals on the lead insulation layer 11 . The purpose of wrapping aluminum foil 9 is to fill and round the lead wires 8 of the II-column winding.

In this embodiment, the above-mentioned lead wire connection structure is made through the following method for connecting lead wires of an UHV transformer. During winding, the winding direction of the I-column winding in the double-column is the right winding direction, and the winding direction of the II column winding is the left winding direction, and during the winding process of the I-column winding, the first wire cake at the head end The outermost circle of the coil cannot be a full turn, and several spaces need to be reserved, so that the lead wire of the II column winding can be wound at the above-mentioned space position of the I column winding after being led out of the II column winding. After the lead wire of the II column winding is drawn out of the II column winding, it continues to be wound on the I column winding, and then meets the lead wire of the I column winding, and the two are drawn out in parallel after the meeting. Preferably, the specification of the lead wire of the II-column winding is the same as that of the first stage of the I-column winding.

Wherein, the winding direction of the lead wire of the II column winding on the I column winding is opposite to that of the I column winding, and the winding length of the lead wire of the II column winding on the outermost circumference of the I column winding is I 1/8 to 1/6 of the circumference of the outermost layer of the column winding. Preferably it is 1/6.

The distance between the transition section between the double columns and the centerline of the body between the two columns after the lead wire of the II column winding is drawn out from the II column winding until it continues to be wound on the I column winding is close, and the said The transition section is parallel to the center line of the twin columns.

In this embodiment, for the convenience of process operation, the continuous winding section and the lead-out section of the lead wire of the II-column winding are made respectively, and then the continuous winding section and the lead-out section are connected. The connected part is just in the middle of the double column, thus forming The transition section of the lead wire of the II column winding. That is to say, in this embodiment, the specific steps of winding the lead wire of the II-column winding to the I-column winding after leading out the II-column winding are: winding a section of wire on the outermost circumference of the I-column winding, Until the end of the wire meets the lead wire of the I-column winding, the head end of the wire and the lead wire of the II-column winding are connected as a whole through the cold-pressed tube 1 .

Wherein, the direction indicated by the arrow shown in FIG. 1 is the current direction of the winding in the UHV transformer.

Preferably, as shown in Figures 3 and 4, the lead wires 8 of the II-column winding are covered with aluminum foil 9 on both the side of the I-column winding and the side of the II-column winding, and then wrap half a layer of metallized crepe paper on the aluminum foil 9 10, and make the metal surface of the metallized crepe paper 10 close to the side of the aluminum foil, and then wrap the lead wire insulating layer 11, corrugated cardboard 12 and lead wire forming part 13 on the metallized insulating paper 10.

In this embodiment, when wrapping the lead forming part on the lead, for the convenience of installation of the lead forming part 13, the part of the lead forming part in the middle of the double column is disconnected, and then the lead forming part on the winding side of the I column and the lead forming part on the II side are disconnected. The lead forming parts on the winding side are connected together after overlapping in the middle of the double columns, and the specific overlapping length is about 160mm.

It can be understood that, the above embodiments are only exemplary embodiments adopted to illustrate the principles of the present invention, but the present invention is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present utility model, and these variations and improvements are also regarded as the protection scope of the present utility model.

Claims (7)

1. A lead wire connection structure of a UHV transformer, the UHV transformer adopts a double-column parallel structure, and is characterized in that the winding direction of the I-column winding in the double-column is the right winding direction, and the winding direction of the II-column winding is In the left direction, the lead wire of the II-column winding includes four sections connected in sequence, that is, the lead-out section after being drawn out from the II-column winding, the transition section between the I-column winding and the II-column winding, and continues to be wound on the I-column winding The continuation of the winding section, and the meeting section with the lead wire of the I column winding, the meeting section of the lead wire of the II column winding is drawn in parallel with the lead wire of the I column winding, and the transition section of the lead wire of the II column winding is connected to the device between the two columns Closer to body centerline. 2. The lead wire connection structure of the UHV transformer according to claim 1, wherein the winding direction of the continuous winding section of the lead wire of the II column winding on the I column winding is opposite to the winding direction of the I column winding . 3. The lead wire connection structure of the UHV transformer according to claim 1, wherein the length of the continuous winding section of the lead wire of the II column winding is 1/8 to 1/8 of the circumference of the outermost layer of the I column winding. 1/6. 4. The lead wire connection structure of the UHV transformer as claimed in claim 3, wherein a space is reserved on the outermost circumference of the first line cake at the head end of the I column winding, and the lead wire of the II column winding The continuation section is wound at this spatial position. 5. The lead wire connection structure of the UHV transformer according to any one of claims 1-4, wherein the transition section of the lead wire of the II column winding is parallel to the central connection line of the double columns. 6. An ultra-high voltage transformer, which adopts a double-column parallel structure, characterized in that the ultra-high voltage transformer adopts the lead wire connection structure described in any one of claims 1-5. 7. The UHV transformer according to claim 6, characterized in that the UHV transformer includes an oil tank, the double columns are arranged inside the oil tank, a partition is provided between the inner wall of the oil tank and the double columns, and the winding of the II column The transition section of the lead wire is between the dividing plate and the center line of the double column.