Method for handling transport and assembly of single-phase transformer and transformer arrangement

Abstract

A method for handling the shipping and assembly of a single-phase transformer. The single-phase transformer is divided into two or more active portions (14). The two or more active parts (14) are transported to the field in at least two separate housings (10). The single-phase transformer is then assembled by electrically connecting the boxes (10) together on site, where the boxes (10) are electrically connected by one or more leads. The at least one tank (10) comprises a tertiary winding, the at least one tank (10) does not comprise a tertiary winding, and wherein the tertiary winding supplies power to a separate voltage system.

Description

Technical Field

[0001] Embodiments of the present disclosure relate to the field of transformers. In particular, embodiments of the present disclosure relate to handling the transportation and assembly of single-phase transformers. Background Art

[0002] Power transformers are equipment used in the power grid of a power system. Power transformers transform voltage and current to transmit and distribute electrical energy. In some cases, power transformers are very large and may not be transportable to certain locations. Therefore, it is useful to reduce the size of the largest transportable part of the transformer.

[0003] One way to solve this problem is to disassemble the transformer at the factory and transport it to the site in batches. The transformer is then assembled on site. This has the disadvantage that, for example, facilities and resources at the site are required for assembly. Ensuring quality is also a challenge because it is difficult to conduct high-voltage tests on site. When using this technique, high-voltage tests are generally not performed after on-site assembly.

[0004] Another way to solve this problem is to use parallel units. The required rated power is divided into several smaller units, and each unit is transported to the site. One disadvantage of this is that each transformer needs to be installed on site, including the foundation, firewalls, and electrical connections, including bushings on the transformer. This will increase the cost and footprint of the transformer and the site.

[0005] Another way to solve the problem of three-phase transformers is to use special three-phase devices. The three-phase unit is divided into three single-phase active parts, and each part is transported to the site in a separate enclosure. The three enclosures are located together on the same foundation on site and are usually connected together by leads in the oil pipes. The disadvantage of this solution is that it does not sufficiently reduce the transport size of the single-phase enclosures, and the single-phase enclosures may be too large to transport. In addition, if a spare unit is needed, a full three-phase transformer of the spare unit (i.e., three single-phase enclosures) is usually required.

[0006] JP H06101410B2 relates to a single-phase transformer having a load ratio regulator. Unit transformers 1A and 1B constituting the single-phase transformer are arranged in parallel such that their longitudinal sides face each other. High-voltage bushings 16 and low-voltage bushings 17 are horizontally arranged parallel to the longitudinal direction of the unit transformers such that the two bushings face each other. Load ratio regulators 3A and 3B are arranged on both sides of the bushing 17. In this arrangement, space can be effectively utilized, the bushings 16 and 17 can be set at a lower position, and the seismic strength can be improved.

[0007] JP H06251951A relates to a method for minimizing the proportional connection operation and improving the insulation characteristics. High-voltage leads are led out from both sides of the transformer tank and connected to the high-voltage bushings. The medium-voltage leads are connected in such a way that the upper and lower leads of each winding are connected in parallel between other windings different from the winding to which the high-voltage leads are connected and are commonly connected.

[0008] JP S59210622A discloses a method for facilitating the separation and connection between individual unit transformers of a split-type transformer. In this method, the portions in the individual unit transformer tanks that will be penetrated by the terminal conductors of the windings are defined by insulating gaskets, and the spaces between adjacent gaskets are connected by connection pipes including conductors and encapsulated insulating gas.

[0009] JP S57133609A discloses a method for reducing the time required for on-site installation of a transformer. In this method, the transformer tank body is divided into multiple transport units, and each unit is horizontally moved using rolling members inserted between the tank body and the base beam, while the leads of each transport unit are connected to another lead using sliding contacts.

[0010] JP S58124215A discloses improving the assembly operability of a split-type transformer through the following processes: assembling leads and insulating barriers, manufacturing a connection pipe structure with protective covers installed on both end holes, removing the covers during transformer assembly, installing them on the tank bodies of the unit transformers, and connecting the leads to the coil leads.

[0011] JP S62229909A discloses a method for minimizing the filling amount and discharge amount of insulating oil and facilitating the conversion from parallel operation to single operation. In this method, an isolation oil layer is provided in the cable chamber, connection leads connected to the cables through insulating gaskets are installed in the cable chamber, and the conservator is connected to the isolation oil layer through a valve.

[0012] JP H09312216A discloses an oil-immersed split electric device that is easy to reassemble on-site, does not reduce its characteristics due to reassembly, and has superior safety.

[0013] The present disclosure proposes an improved feasible solution for a method and a transformer arrangement. Summary of the Invention

[0014] The purpose of the embodiments herein is to enhance the transportation and assembly of single-phase transformers.

[0015] According to one aspect, the above object is achieved by providing a method performed by a transformer device for handling the transportation and assembly of a single-phase transformer. The single-phase transformer is divided into two or more active parts. The two or more active parts are transported to the site in at least two separate enclosures. Then, the single-phase transformer is assembled by electrically connecting the enclosures at the site, wherein the enclosures are electrically connected by one or more leads.

[0016] According to some embodiments, the enclosures can be located on the same foundation at the site.

[0017] According to some embodiments, at least two enclosures may not be separated by a firewall.

[0018] According to some embodiments, at least two enclosures may have different electrical characteristics.

[0019] According to some embodiments, at least one enclosure may include a regulating winding for voltage regulation, and at least one enclosure does not include a regulating winding.

[0020] According to some embodiments, at least two enclosures may be connected in series.

[0021] According to some embodiments, at least two enclosures may be connected in parallel.

[0022] According to some embodiments, the enclosures may be connected to the primary side and / or the secondary side of the single-phase transformer.

[0023] According to some embodiments, the enclosures may share the same common cooling device.

[0024] According to some embodiments, at least two enclosures may be mechanically connected. According to some embodiments, the mechanical connection may allow the at least two enclosures to be transported in a connected state at the site.

[0025] According to some embodiments, at least one enclosure may include a tertiary winding, and at least one enclosure may not include a tertiary winding.

[0026] According to another aspect, the object is also achieved by providing a transformer device. The transformer device includes a single-phase transformer and two or more enclosures. The transformer device is configured to divide the single-phase transformer into two or more active parts and transport the two or more active parts to the site in at least two separate enclosures. The transformer device is further configured to assemble the single-phase transformer by electrically connecting the enclosures at the site, wherein the enclosures are electrically connected by one or more leads.

[0027] According to another aspect, this object is also achieved by providing a single-phase transformer. The single-phase transformer is configured to be divided into two or more active parts, wherein the two or more active parts are transported to the site in at least two separate enclosures. The single-phase transformer is further configured to be assembled by connecting the enclosures together on site, and wherein the enclosures are electrically connected by one or more leads.

[0028] Embodiments herein are based on the recognition that by dividing a single-phase transformer into at least two active parts, which are transported to the site in at least two separate enclosures, the transport size of the single-phase transformer is significantly reduced. Additionally, since the single-phase transformer can be assembled by electrically connecting the enclosures together on site, the assembly is handled more efficiently. Thereby, the transport and assembly of the single-phase transformer are enhanced. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Other technical features of the present invention will become apparent from the following description of one or more exemplary embodiments given with reference to the accompanying drawings, wherein:

[0030] Figure 1 is a schematic diagram depicting a transformer device according to an embodiment herein;

[0031] Figure 2 is a flowchart depicting a method according to an embodiment herein;

[0032] Figure 3 is a schematic diagram depicting a transformer device according to some embodiments herein; and

[0033] Figure 4 is a schematic diagram according to some embodiments.

[0034] It should be noted that the drawings are not necessarily drawn to scale, and for clarity, the dimensions of some components may be exaggerated. DETAILED DESCRIPTION

[0035] Figure 1FIG. 20 shows a transformer device 20 according to an embodiment herein. The transformer device 20 is configured to divide (e.g., separate) a single-phase transformer into two or more active parts 14. The active part 14 of the single-phase transformer herein is the iron core, winding, and electrical insulation between windings of the single-phase transformer. The two active components 14 can be placed in at least two separate enclosures 10 (e.g., transformer enclosures). The at least two separate enclosures 10 are electrically connected by one or more leads and can be mechanically attached together. Then, the two or more active parts 14 are transported to the site in the at least two separate enclosures 10. When on-site, the single-phase transformer is assembled by electrically connecting the enclosures 10 together. If a voltage regulation system is used in the transformer device, it can be enabled by using a common on-load tap-changer (OLTC) or a common OLTC drive unit. This means that the size of at least some enclosures 10 can be reduced and the number of components can be decreased. According to some embodiments, a fully assembled spare single-phase unit can be provided on-site as a backup, which includes at least two separate enclosures 10 with active parts 14 installed on-site. In the case of a failure of one of the single-phase transformers in operation, using the fully assembled spare unit shortens the replacement time.

[0036] Reference will now be made to Figure 2 the flowchart depicted in

[0037] Action 201

[0038] To significantly reduce the shipping size of the single-phase transformer, the single-phase transformer is first divided into two or more active parts 14. Certain shipping modes can thus be enabled. Accordingly, the shipping of the single-phase transformer can be significantly simplified, thereby reducing costs. In addition, in some cases, it may not be possible to ship a full-size single-phase unit at all, so it is necessary to take measures to reduce the size.

[0039] Action 202

[0040] Then, the two or more active parts 14 are transported to the site in at least two separate enclosures 10. The at least two enclosures 10 with active parts 14 can be regarded as one unit, such as a shipping unit, and can be referred to as a single-phase unit. The enclosures 10 can be transported by one or more vehicles (e.g., trucks).

[0041] According to some embodiments, at least two boxes 10 may have different electrical characteristics. This is advantageous / useful because under certain conditions this may allow for a reduction in the size of the maximum transportable part, or in some cases this may allow for a reduction in the total number of active parts and boxes. In some cases, this may also reduce the cost of the single-phase transformer because the active part 14 can be more specialized. Furthermore, the reliability of the single-phase unit can be increased because fewer components (e.g., regulating windings, tertiary windings, and / or tap switches) may be required, thus reducing the overall failure risk.

[0042] At least two boxes 10 may be mechanically connected. The mechanical connection can be made in such a way as to allow at least two boxes 10 to be transported in a connected state on-site (i.e., inside the site). Thus, during transportation to the site, at least two boxes 10 may not be connected, but they can be moved after being connected inside the site. This is a great advantage if it is necessary to replace an operating unit with a fully assembled spare unit in a short period of time. This is a great advantage if it is necessary to replace an operating unit with a spare unit. In such a case, the spare unit can be fully assembled before the replacement step, which will reduce the time for the spare unit to be put into operation.

[0043] According to some embodiments, at least one box 10 may include a regulating winding for voltage regulation, and at least one box 10 does not include a regulating winding. This is advantageous / useful because under certain conditions this may allow for a reduction in the size of the maximum transportable part, or in some cases this may allow for a reduction in the total number of active parts and boxes. Furthermore, the reliability of the single-phase unit can be increased because fewer components (e.g., tap switches and regulating windings) are required. According to some embodiments, at least one box 10 including a regulating winding may not be connected to the primary side or the secondary side of the transformer.

[0044] According to some embodiments, at least one box 10 including a regulating winding may be connected to one of the primary side and the secondary side, but not simultaneously to both. According to some embodiments, at least one box 10 including a regulating winding may be connected to both the primary side and the secondary side simultaneously.

[0045] According to some embodiments, at least two boxes 10 may be connected in series. This is advantageous because under certain conditions this may allow for a reduction in the size of the maximum transportable part, or under certain conditions this allows for a reduction in the total number of active parts and boxes. Furthermore, the reliability of the single-phase unit can be increased, and the cost can be reduced because some parts may be exposed to a lower voltage level.

[0046] According to some embodiments, at least two enclosures 10 may be connected in parallel. This is advantageous because it allows for a less complex design where each component can be made with the same or a similar design. Additionally, in some embodiments, reliability can be increased because some of the parallel sections can operate even if other parallel sections fail. At least two enclosures 10 may be connected in parallel and in series.

[0047] According to some embodiments, the enclosure 10 may be connected to the primary side of the transformer. This is advantageous because it allows for a single connection to the external primary voltage system, which can reduce the overall size and cost of the transformer device 20, including the size of the transformer enclosure 10, the transformer foundation, and the transformer chamber. Additionally, this can increase the reliability of the single-phase transformer because fewer components, such as bushings, may be required.

[0048] According to some embodiments, the enclosure 10 may be connected to the secondary side of the transformer. This is advantageous because it allows for a single connection to the external secondary voltage system, which can reduce the overall size and cost of the transformer device 20, including the size of the transformer enclosure 10 and the transformer chamber. Additionally, this can increase the reliability of the transformer because fewer components, such as bushings, may be required.

[0049] According to some embodiments, the enclosure 10 may be connected to both the primary side and the secondary side of the transformer. This is advantageous because it allows for a single connection to the external primary and secondary voltage systems, which can reduce the overall size and cost of the transformer device, including the size of the transformer enclosure 10 and the transformer chamber. Additionally, this can increase the reliability of the transformer because only a few components, such as bushings, are required.

[0050] Therefore, the enclosure 10 may be connected to the primary side of the single-phase transformer and / or the secondary side of the single-phase transformer.

[0051] According to some embodiments, at least two enclosures 10 may include separate cooling equipment and / or at least two enclosures 10 may include shared cooling equipment. According to some embodiments, the enclosures 10 may share the same shared cooling equipment. This is advantageous because it can reduce the overall size, cost, and complexity of the transformer device, including the size of the cooling control and the transformer chamber.

[0052] According to some embodiments, at least one enclosure 10 may include a tertiary winding and at least one enclosure 10 may not include a tertiary winding.

[0053] According to some embodiments, the enclosures 10 may be arranged in a row, and the construction of the three-phase group may be achieved by arranging the single-phases side by side such that these rows are parallel to each other.

[0054] According to some embodiments, the enclosures 10 are aligned side by side, with the long sides of the enclosures facing each other.

[0055] According to some embodiments, at least one housing 10 may include a tertiary winding, and at least one housing 10 may not include a tertiary winding.

[0056] Action 203

[0057] Then, a single-phase transformer is assembled by electrically connecting the housings 10 together on-site, where the housings 10 are electrically connected by one or more leads, for example, in oil or a fluid.

[0058] According to some embodiments, the housings 10 may be located on the same foundation on-site and, for example, electrically connected together. This is advantageous because it reduces the footprint and cost required for on-site civil construction. At least two housings 10 may not be separated by a firewall.

[0059] By adopting the above embodiments, the size and weight of the single-phase transformer (e.g., each shipping unit) to be transported can be significantly reduced.

[0060] The above embodiments herein will now be further described and illustrated. The following applies to any suitable one of the above embodiments and may be combined therewith.

[0061] Figure 3 A transformer device 20 according to some embodiments is shown. At least two housings 10 may be mechanically connected together, electrically connected in oil by one or more leads (e.g., in an oil or fluid conduit), and transported to the site. At least one of the housings 10 may include a regulating winding for regulating voltage, and at least one housing 10 may not include a regulating winding. At least one housing 10 may include a regulating winding to regulate voltage, marked with an X in Figure 3 . Thus, at least one housing 10 may include regulating means. At least one housing 10 may include a tertiary winding to supply a separate voltage system, and at least one housing 10 may not include a tertiary winding. Providing the tertiary winding in less than all of the housings can reduce costs because the total number of tertiary windings required is less, thereby also improving the reliability of the single-phase transformer. Figure 3 Four housings 10 connected in parallel are shown, where three of the housings 10 may be connected in parallel as the main single-phase transformer, and all four of the housings 10 may be referred to as single-phase units.

[0062] Figure 4FIG. 0 shows a transformer device 20 according to some embodiments. The figure shows an example with three serially connected units, for example three serially connected enclosures 10 including an active part 14 of a single-phase transformer. However, it does not necessarily have to be three serially connected units, and this can be any number two or more. The three enclosures 10 can be mechanically connected and have electrical connections in oil. In some embodiments, for example in a Y-connected transformer, the serially connected units have a lower voltage. According to one embodiment, the tap changer is located in the unit with the lowest voltage.

[0063] It should be noted that any feature of any aspect can be applied to any other aspect as long as it is appropriate. Similarly, any advantage of any aspect can be applied to any other aspect.

[0064] In general, unless otherwise clearly defined herein, all terms used in the claims should be interpreted in accordance with their ordinary meaning in the art to which this technology pertains. Unless otherwise clearly stated, all references to "a / an / the member, device, component, assembly, step, etc." should be construed openly as referring to at least one instance of the member, device, component, assembly, step, etc. Unless otherwise specified, the steps of any method disclosed herein do not have to be performed in the exact order disclosed. The use of "first", "second", etc. for different features / components of this disclosure is only intended to distinguish the features / components from other similar features / components, rather than to assign any order or hierarchy to the features / components.

[0065] It should be understood that the above description and the drawings represent non-limiting examples of the methods taught herein. Therefore, the techniques taught herein are not limited by the above description and the drawings. On the contrary, the embodiments herein are only limited by the following claims and their legal equivalents.

Claims

1. A method for handling the transportation and assembly of a single-phase transformer, wherein, The method includes: Dividing (201) the single-phase transformer into two or more active parts (14); Transporting (202) the two or more active parts (14) to the site in at least two separate enclosures (10); and Assembling (203) the single-phase transformer by electrically connecting the enclosures (10) together at the site, wherein the enclosures (10) are electrically connected by one or more leads, wherein at least one of the enclosures (10) includes a tertiary winding, at least one of the enclosures (10) does not include a tertiary winding, and wherein the tertiary winding supplies a separate voltage system.

2. The method according to claim 1, wherein, The enclosures (10) are located on the same foundation at the site.

3. The method according to claim 1 or 2, wherein At least two of the enclosures (10) are not separated by a firewall.

4. The method according to any one of claims 1 to 3, wherein At least two of the enclosures (10) have different electrical characteristics.

5. The method according to any one of claims 1 to 4, wherein At least one of the enclosures (10) includes a regulating winding for regulating voltage, and at least one of the enclosures (10) does not include a regulating winding.

6. The method according to any one of claims 1 to 5, wherein At least two of the enclosures (10) are connected in series.

7. The method according to any one of claims 1 to 5, wherein At least two of the enclosures (10) are connected in parallel.

8. The method according to any one of claims 1 to 7, wherein, The enclosures (10) are connected to the primary side and / or the secondary side of the single-phase transformer.

9. The method according to any one of claims 1 to 8, wherein At least two of the enclosures (10) include separate cooling equipment, and / or at least two of the enclosures (10) include common cooling equipment.

10. The method according to any one of claims 1 to 9, wherein, At least two of the enclosures (10) are mechanically connected.

11. According to the method of claim 10, wherein, The mechanical connection is made in such a way as to allow the at least two enclosures (10) to be transported in a connected state at the site.

12. A transformer device includes a single-phase transformer and two or more boxes (10), wherein, The transformer device is configured to: Divide the single-phase transformer into two or more active parts (14); Transport the two or more active parts (14) to the site in at least two separate enclosures (10); And Assemble the single-phase transformer by electrically connecting the enclosures (10) together at the site, wherein the enclosures (10) are electrically connected by one or more leads, wherein at least one of the enclosures (10) includes a tertiary winding, at least one of the enclosures (10) does not include a tertiary winding, and wherein the tertiary winding is configured to supply a separate voltage system.

13. The transformer device according to claim 12, wherein, The transformer device is configured to perform the method according to any one of claims 2 to 11.

14. A single-phase transformer configured to be divided into two or more active parts (14), wherein, The two or more active parts (14) are transported to the site in at least two separate enclosures (10), and wherein the single-phase transformer is assembled by connecting the enclosures (10) together at the site, and wherein the enclosures (10) are electrically connected by one or more leads, wherein at least one of the enclosures (10) includes a tertiary winding, at least one of the enclosures (10) does not include a tertiary winding, and wherein the tertiary winding is configured to supply a separate voltage system.

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