Dyn11-Yzn11 conversion capacity regulating transformer switch group, transformer and transformer capacity regulating method

Abstract

The present invention discloses a Dyn11-Yzn11 conversion capacity-adjusting transformer switch group, a transformer and a transformer capacity-adjusting method. The transformer switch group includes: a first switch group, which is arranged on the low-voltage side of the transformer, and a second switch group, which is arranged on the high-voltage side of the transformer; the first switch group includes: a first vacuum switch, a first switch, a second switch, a third switch, a fourth switch, a fifth switch, a sixth switch, a seventh switch and a first transition resistor; the second switch group includes: a second vacuum switch, an eighth switch, a ninth switch, a tenth switch, an eleventh switch and a second transition resistor. The present invention solves the technical problem in the related art that the capacity of the transformer is adjusted to cause a sudden change in the phase of the power supply voltage.

Description

Technical Field

[0001] The present invention relates to the field of transformers, and in particular to a Dyn11-Yzn11 conversion capacity-adjusting transformer switch group, a transformer and a transformer capacity-adjusting method. Background Art

[0002] Most of the on-load tap changers equipped with early power transformers used high-speed resistor switching and relied on copper-tungsten arc contacts for load conversion. This type of tap changer is frequently switched, the arc contacts are burned more seriously, and the oil is carbonized and contaminated faster, which increases the workload of daily maintenance and regular inspections for power supply departments.

[0003] With the widespread promotion of vacuum technology and power electronics information, on-load tap changers are also undergoing revolutionary changes. In order to meet the needs of the modernization of power systems, completely solve the problem of oil pollution, improve the mechanical life of on-load tap changers and the electrical life of contacts, extend the maintenance cycle, significantly reduce maintenance costs, and improve the reliability and safety of operation, domestic and foreign on-load tap changer manufacturers have successively developed oil-immersed and gas-type vacuum arc-extinguishing on-load tap changers. However, the biggest disadvantage of permanent magnet switches is that there are few switch positions and only two contacts, normally open and normally closed. If you want to achieve multi-level voltage regulation or capacity regulation functions, you need to configure multiple sets of permanent magnet mechanisms and vacuum tubes.

[0004] In addition, the traditional capacity-adjusting transformer adopts the Dyn11-Yyn0 conversion method. During the switching process, the voltage phase angle will inevitably change, affecting the power supply quality. At the same time, due to the Yyn0 capacity, the three-phase unbalanced current will cause the power supply voltage to be too high and too high, and the three-phase unbalanced loss will increase.

[0005] To address the above-mentioned problems, no effective solution has been proposed yet. Summary of the invention

[0006] The embodiment of the present invention provides a Dyn11-Yzn11 conversion capacity-adjusting transformer switch group, a transformer and a transformer capacity-adjusting method, so as to at least solve the technical problem in the related art that the capacity of the transformer is adjusted to cause a sudden change in the phase of the power supply voltage.

[0007] According to one aspect of an embodiment of the present invention, a transformer switch group is provided, comprising: a first switch group, arranged on a low-voltage side of a transformer, and a second switch group, arranged on a high-voltage side of the transformer; wherein the first switch group comprises: a first vacuum switch, wherein a first switch and a second switch are arranged at a first end of the first vacuum switch, wherein the first switch is arranged between the first end of the first vacuum switch and a first end of a first coil in a low-voltage side coil group of the transformer, and the second switch is arranged between the first end of the first vacuum switch and a second end of a second coil of a first adjacent phase of the transformer; a third switch is arranged between the first end of the first vacuum switch and a low-voltage neutral point; a fourth switch is arranged between the second end of the vacuum switch and the low-voltage neutral point; a first transition resistor is arranged between the second end of the vacuum switch and the first adjacent phase of the transformer a fifth switch, arranged between the first end of the second coil in the low-voltage side coil group of the transformer and the low-voltage neutral point; a sixth switch, arranged between the first end of the second coil and the first end of the first coil in the second adjacent phase of the transformer; a seventh switch, arranged between the second end of the second coil and the phase line of the low-voltage side coil group of the transformer; the second switch group includes: a second vacuum switch, an eighth switch is arranged at the first end of the second vacuum switch, and a ninth switch is arranged at the second end of the second vacuum switch; a tenth switch is arranged between the first end of the second vacuum switch and the phase line of the first adjacent phase of the transformer; an eleventh switch is arranged between the first end of the second vacuum switch and the high-voltage neutral point; a second transition resistor is arranged between the second end of the second vacuum switch and the high-voltage neutral point.

[0008] According to another aspect of an embodiment of the present invention, a transformer is also provided, including: the transformer includes the above-mentioned transformer switch group, and also includes: three groups of low-voltage side coil groups, arranged on the low-voltage side of the iron core, each group of low-voltage side coil groups includes two groups of coils, the second end of the first coil is connected to the phase line, and the second end of the second coil is connected to the transition resistor of the second adjacent phase; three groups of high-voltage side coil groups, arranged on the high-voltage side of the iron core, each group of high-voltage side coil groups includes a group of coils, the first end of the second switch group is connected to the first end of a group of coils, the second end of the second switch group is connected to the second end of a group of coils of the adjacent phase, and the third end of the second switch group is connected to the high-voltage neutral point, wherein the eighth switch of the second switch group is arranged between the first end of the second vacuum switch and the first end of the high-voltage side coil group, and the ninth switch of the second switch group is arranged between the second end of the second vacuum switch and the first end of the high-voltage side coil group.

[0009] According to another aspect of the embodiments of the present invention, a transformer capacity adjustment method is also provided, which is applied to the above-mentioned transformer, comprising: controlling the seventh switch of each first switch group from closed to open; after the seventh switch is opened, controlling the fifth switch of each first switch group from closed to open; after the fifth switch is opened, controlling the sixth switch of each first switch group from open to closed; after the sixth switch is closed, controlling the first vacuum switch of each first switch group from open to closed, and controlling the second vacuum switch of each second switch group from open to closed; after the first vacuum switch and the second vacuum switch are closed, controlling the fourth switch of each first switch group from open to closed, and controlling the ninth switch of each second switch group from open to closed; after the fourth switch and the ninth switch are closed, After the ninth switch is closed, the third switch of each of the first switch groups is controlled to be closed to open, and the eighth switch of each of the second switch groups is controlled to be closed to open; after the third switch and the eighth switch are opened, the first vacuum switch and the second vacuum switch are controlled to be closed to open; after the first vacuum switch and the second vacuum switch are opened, the first switch of each of the first switch groups is controlled to be closed to open, and the tenth switch of each of the second switch groups is controlled to be closed to open; after the first switch and the tenth switch are opened, the second switch of each of the first switch groups is controlled to be opened to closed, and the eleventh switch of each of the second switch groups is controlled to be opened to closed; after the second switch and the eleventh switch are closed, the first vacuum switch and the second vacuum switch are controlled to be opened to closed.

[0010] According to another aspect of the embodiments of the present invention, a transformer capacity adjustment method is also provided, which is applied to the above-mentioned transformer, comprising: controlling the seventh switch of each first switch group from closed to open; after the seventh switch is opened, controlling the sixth switch of each first switch group from open to closed; after the sixth switch is closed, controlling the fifth switch of each first switch group from closed to open; after the fifth switch is opened, controlling the first vacuum switch of each first switch group from open to closed, and controlling the second vacuum switch of each second switch group from open to closed; after the first vacuum switch and the second vacuum switch are closed, controlling the fourth switch of each first switch group from open to closed, and controlling the ninth switch of each second switch group from open to closed; after the fourth switch and the ninth switch are closed, After the ninth switch is closed, the third switch of each of the first switch groups is controlled to be closed to open, and the eighth switch of each of the second switch groups is controlled to be closed to open; after the third switch and the eighth switch are opened, the first vacuum switch and the second vacuum switch are controlled to be closed to open; after the first vacuum switch and the second vacuum switch are opened, the first switch of each of the first switch groups is controlled to be closed to open, and the tenth switch of each of the second switch groups is controlled to be closed to open; after the first switch and the tenth switch are opened, the second switch of each of the first switch groups is controlled to be opened to closed, and the eleventh switch of each of the second switch groups is controlled to be opened to closed; after the second switch and the eleventh switch are closed, the first vacuum switch and the second vacuum switch are controlled to be opened to closed.

[0011] According to another aspect of the embodiment of the present invention, a transformer capacity regulating device is further provided, wherein a first control module is used to control the seventh switch of each of the first switch groups from closed to open; a second control module is used to control the fifth switch of each of the first switch groups from closed to open after the seventh switch is opened; a third control module is used to control the sixth switch of each of the first switch groups from open to closed after the fifth switch is opened; a fourth control module is used to control the first vacuum switch of each of the first switch groups from open to closed after the sixth switch is closed, and control the second vacuum switch of each of the second switch groups from open to closed; a fifth control module is used to control the fourth switch of each of the first switch groups from open to closed after the first vacuum switch and the second vacuum switch are closed, and control the ninth switch of each of the second switch groups from open to closed; a sixth control module is used to control the fourth switch of each of the first switch groups from open to closed after the first vacuum switch and the second vacuum switch are closed; and after the ninth switch is closed, the third switch of each of the first switch groups is controlled to be closed to open, and the eighth switch of each of the second switch groups is controlled to be closed to open; a seventh control module is used to control the first vacuum switch and the second vacuum switch from being closed to open after the third switch and the eighth switch are opened; an eighth control module is used to control the first switch of each of the first switch groups from being closed to open, and the tenth switch of each of the second switch groups from being closed to open after the first vacuum switch and the second vacuum switch are opened; a ninth control module is used to control the second switch of each of the first switch groups from being opened to being closed, and the eleventh switch of each of the second switch groups from being opened to being closed after the first switch and the tenth switch are opened; a tenth control module is used to control the first vacuum switch and the second vacuum switch from being opened to being closed after the second switch and the eleventh switch are closed.

[0012] According to another aspect of the embodiment of the present invention, a transformer capacity regulating device is further provided, wherein an eleventh control module is used to control the seventh switch of each of the first switch groups from closed to open; a twelfth control module is used to control the sixth switch of each of the first switch groups from open to closed after the seventh switch is opened; a thirteenth control module is used to control the fifth switch of each of the first switch groups from closed to open after the sixth switch is closed; a fourteenth control module is used to control the first vacuum switch of each of the first switch groups from open to closed after the fifth switch is opened, and control the second vacuum switch of each of the second switch groups from open to closed; a fifteenth control module is used to control the fourth switch of each of the first switch groups from open to closed after the first vacuum switch and the second vacuum switch are closed, and control the ninth switch of each of the second switch groups from open to closed; a sixteenth control module is used to control the fourth switch of each of the first switch groups from open to closed after the first vacuum switch and the second vacuum switch are closed; a seventeenth control module, for controlling the first vacuum switch and the second vacuum switch from closing to opening after the third switch and the ninth switch are closed, and controlling the eighth switch of each second switch group from closing to opening; a seventeenth control module, for controlling the first vacuum switch and the second vacuum switch from closing to opening after the third switch and the eighth switch are opened; an eighteenth control module, for controlling the first switch of each first switch group from closing to opening, and controlling the tenth switch of each second switch group from closing to opening after the first vacuum switch and the second vacuum switch are opened; a nineteenth control module, for controlling the second switch of each first switch group from opening to closing, and controlling the eleventh switch of each second switch group from opening to closing after the first switch and the tenth switch are opened; a twentieth control module, for controlling the first vacuum switch and the second vacuum switch from opening to closing after the second switch and the eleventh switch are closed.

[0013] The transformer switch group of the present application includes: a first switch group, which is arranged on the low-voltage side of the transformer, and a second switch group, which is arranged on the high-voltage side of the transformer; wherein the first switch group includes: a first vacuum switch, wherein a first switch and a second switch are arranged at the first end of the first vacuum switch, wherein the first switch is arranged between the first end of the first vacuum switch and the first end of the first coil in the low-voltage side coil group of the transformer, and the second switch is arranged between the first end of the first vacuum switch and the second end of the second coil of the first adjacent phase of the transformer; a third switch, which is arranged between the first end of the first vacuum switch and the low-voltage neutral point; a fourth switch, which is arranged between the second end of the vacuum switch and the low-voltage neutral point; a first transition resistor, which is arranged between the second end of the vacuum switch and the second end of the second coil of the first adjacent phase of the transformer; a fifth switch, which is arranged between the first end of the second coil in the low-voltage side coil group of the transformer and the low-voltage neutral point; a sixth switch, arranged between the first end of the second coil and the first end of the first coil in the second low-voltage side coil group of the transformer; a seventh switch, arranged between the second end of the second coil and the phase line of the low-voltage side coil group of the transformer; the second switch group comprises: a second vacuum switch, an eighth switch is arranged at the first end of the second vacuum switch, and a ninth switch is arranged at the second end of the second vacuum switch; a tenth switch is arranged between the first end of the second vacuum switch and the phase line of the first adjacent phase of the transformer; an eleventh switch is arranged between the first end of the second vacuum switch and the high-voltage neutral point; a second transition resistor is arranged between the second end of the second vacuum switch and the high-voltage neutral point, so as to achieve the purpose of adjusting the capacity of the transformer without changing the phase of the power supply voltage, thereby achieving the technical effect of avoiding the degradation of power supply quality caused by phase mutation, and further solving the technical problem of adjusting the capacity of the transformer causing phase mutation of the power supply voltage in the related art. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0015] Figure 1 is a schematic diagram of a transformer switch group according to an embodiment of the present application;

[0016] Figure 2 It is a structural schematic diagram of a low-voltage side coil and a first switch group of a transformer provided in an embodiment of the present application;

[0017] Figure 3 It is a structural schematic diagram of a high-voltage side coil and a second switch group of a transformer provided in an embodiment of the present application;

[0018] Figure 4 It is a timing diagram of a transformer capacity adjustment method provided according to an embodiment of the present application;

[0019] Figure 5 is a schematic diagram of a transformer capacity adjustment device according to an embodiment of the present application;

[0020] Figure 6 is a schematic diagram of a transformer capacity adjustment device according to an embodiment of the present application. DETAILED DESCRIPTION

[0021] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0022] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0023] According to an embodiment of the present application, a transformer switch group is provided.

[0024] Figure 1 Schematic diagram of a transformer switch group according to an embodiment of the present application. Figure 1As shown, the transformer switch group includes: a first switch group 12, which is arranged on the low-voltage side of the transformer, and a second switch group 14, which is arranged on the high-voltage side of the transformer; wherein the first switch group 12 includes: a first vacuum switch, wherein a first switch and a second switch are arranged at the first end of the first vacuum switch, the first switch is arranged between the first end of the first vacuum switch and the first end of the first coil in the low-voltage side coil group of the transformer, and the second switch is arranged between the first end of the first vacuum switch and the second end of the second coil of the first adjacent phase of the transformer; a third switch is arranged between the first end of the first vacuum switch and the low-voltage neutral point; a fourth switch is arranged between the second end of the vacuum switch and the low-voltage neutral point; a first transition resistor is arranged between the second end of the vacuum switch and the second end of the second coil of the first adjacent phase of the transformer; a fifth switch is arranged between the first end of the second coil in the low-voltage side coil group of the transformer and the low-voltage neutral point; a sixth switch is arranged between the first end of the second coil and the first end of the first coil in the second adjacent phase of the transformer; and a seventh switch is arranged between the second end of the second coil and the phase line of the low-voltage side coil group of the transformer.

[0025] It should be noted that the first adjacent phase and the second adjacent phase are different phases adjacent to the low-voltage side coil group of the transformer in the low-voltage side of the transformer. The order of the first adjacent phase and the second adjacent phase may not be limited.

[0026] The second switch group 14 includes: a second vacuum switch, an eighth switch is arranged at the first end of the second vacuum switch, and a ninth switch is arranged at the second end of the second vacuum switch; a tenth switch is arranged between the first end of the second vacuum switch and the phase line of the first adjacent phase of the transformer; an eleventh switch is arranged between the first end of the second vacuum switch and the high-voltage neutral point; and a second transition resistor is arranged between the second end of the second vacuum switch and the high-voltage neutral point.

[0027] It should be noted that the transformer switch group in this embodiment is used in the transformer capacity adjustment process. By changing the on / off state of each switch of the switch group, the connection mode of the transformer coil winding is switched, thereby adjusting the transformer capacity. The transformer switch group in this embodiment greatly reduces the number of permanent magnetic vacuum arc extinguishing switches used through clever design, and realizes multi-stage voltage regulation or capacity adjustment functions, thereby saving equipment volume and cost. In addition, the switch group in this embodiment adopts the transformer connection conversion method from Dyn11 to Yzn11. From the principle itself, it avoids the sudden change of the power supply voltage phase caused by switching and improves the power supply quality. Thirdly, the switch group can simultaneously reduce the increase of zero-sequence loss caused by three-phase imbalance, and achieve the technical effect of further reducing the distribution transformer loss.

[0028] The transformer switch group of the present application includes: a first switch group, which is arranged on the low-voltage side of the transformer, and a second switch group, which is arranged on the high-voltage side of the transformer; wherein the first switch group includes: a first vacuum switch, wherein a first switch and a second switch are arranged at the first end of the first vacuum switch, the first switch is arranged between the first end of the first vacuum switch and the first end of the first coil in the low-voltage side coil group of the transformer, and the second switch is arranged between the first end of the first vacuum switch and the second end of the second coil of the first adjacent phase of the transformer; a third switch is arranged between the first end of the first vacuum switch and the low-voltage neutral point; a fourth switch is arranged between the second end of the vacuum switch and the low-voltage neutral point; a first transition resistor is arranged between the second end of the vacuum switch and the second end of the second coil of the first adjacent phase of the transformer; a fifth switch is arranged between the first end of the second coil in the low-voltage side coil group of the transformer and the low-voltage neutral point; a sixth switch , arranged between the first end of the second coil and the first end of the first coil in the second low-voltage side coil group of the transformer; the seventh switch, arranged between the second end of the second coil and the phase line of the low-voltage side coil group of the transformer; the second switch group includes: a second vacuum switch, an eighth switch is arranged at the first end of the second vacuum switch, and a ninth switch is arranged at the second end of the second vacuum switch; a tenth switch is arranged between the first end of the second vacuum switch and the phase line of the first adjacent phase of the transformer; an eleventh switch is arranged between the first end of the second vacuum switch and the high-voltage neutral point; a second transition resistor is arranged between the second end of the second vacuum switch and the high-voltage neutral point, so as to achieve the purpose of adjusting the capacity of the transformer without changing the phase of the power supply voltage, thereby achieving the technical effect of avoiding the degradation of power supply quality caused by phase mutation, and thus solving the technical problem of adjusting the capacity of the transformer causing phase mutation of the power supply voltage in the related art.

[0029] According to an embodiment of the present application, a transformer is provided, the transformer comprising: three groups of low-voltage side coil groups, arranged on the low-voltage side of the iron core, each group of low-voltage side coil groups comprising two groups of coils, the second end of the first coil being connected to the phase line, and the second end of the second coil being connected to the transition resistor of the second adjacent phase;

[0030] Three groups of high-voltage side coil groups are arranged on the high-voltage side of the iron core, each group of high-voltage side coil groups includes a group of coils, the first end of the second switch group is connected to the first end of a group of coils, the second end of the second switch group is connected to the second end of a group of coils of an adjacent phase, and the third end of the second switch group is connected to the high-voltage neutral point, wherein the eighth switch of the second switch group is arranged between the first end of the second vacuum switch and the first end of the high-voltage side coil group, and the ninth switch of the second switch group is arranged between the second end of the second vacuum switch and the first end of the high-voltage side coil group.

[0031] like Figure 2 and Figure 3 As shown, Figure 2is a structural schematic diagram of a low-voltage side coil and a first switch group of a transformer provided in an embodiment of the present application, Figure 3 It is a structural schematic diagram of a high-voltage side coil and a second switch group of a transformer provided in an embodiment of the present application.

[0032] In the three groups of transformer switch groups, the first vacuum switches are represented by DA1, DB1 and DC1 respectively, the first switches are TRDA1, TRDB1 and TRDC1 respectively, the second switches are represented by TRDA2, TRDB2 and TRDC2 respectively, the third switches are represented by TRDA3, TRDB3 and TRDC3 respectively, the fourth switches are represented by TRDA4, TRDB4 and TRDC4 respectively, the fifth switches are represented by TRDA5, TRDB5 and TRDC5 respectively, the sixth switches are represented by TRDA6, TRDB6 and TRDC6 respectively, the seventh switches are represented by TRDA7, TRDB7 and TRDC7 respectively, the first transition resistors are represented by DRA1, DRB1 and DRC1 respectively, the first coils are represented by TA1, TB1 and TC1 respectively, the second coils are represented by TA2, TB2 and TC2 respectively, and the low-voltage neutral point is represented as point DC in the figure.

[0033] In the second switch groups of the three transformers, the second vacuum switches are represented by GA2, GB2 and GC2 respectively, the eighth switches are represented by TRGA8, TRGB8 and TRGC8 respectively, the ninth switches are represented by TRGA9, TRGB9 and TRGC9 respectively, and the connection and disconnection between the transformer switch group and the coil are realized by the eighth switch or the ninth switch. The tenth switch is represented by TRGA10, TRGB10 and TRGC10 respectively, the eleventh switch is represented by TRGA11, TRGB11 and TRGC11 respectively, the second transition resistors are represented by GRA2, GRB2 and GRC2 respectively, and the high-voltage neutral point is represented as point GC in the figure.

[0034] According to an embodiment of the present application, a transformer capacity adjustment method is provided, which is applied to the above-mentioned transformer.

[0035] The method comprises: controlling the seventh switch of each first switch group from closed to open; after the seventh switch is opened, controlling the fifth switch of each first switch group from closed to open; after the fifth switch is opened, controlling the sixth switch of each first switch group from open to closed; after the sixth switch is closed, controlling the first vacuum switch of each first switch group from open to closed, and controlling the second vacuum switch of each second switch group from open to closed; after the first vacuum switch and the second vacuum switch are closed, controlling the fourth switch of each first switch group from open to closed, and controlling the ninth switch of each second switch group from open to closed; after the fourth switch and the ninth switch are closed, controlling each first switch The third switch of each switch group is controlled from closed to open, and the eighth switch of each second switch group is controlled from closed to open; after the third switch and the eighth switch are opened, the first vacuum switch and the second vacuum switch are controlled from closed to open; after the first vacuum switch and the second vacuum switch are opened, the first switch of each first switch group is controlled from closed to open, and the tenth switch of each second switch group is controlled from closed to open; after the first switch and the tenth switch are opened, the second switch of each first switch group is controlled from open to closed, and the eleventh switch of each second switch group is controlled from open to closed; after the second switch and the eleventh switch are closed, the first vacuum switch and the second vacuum switch are controlled from open to closed.

[0036] like Figure 4 As shown, it is a timing diagram of a transformer capacity adjustment method provided according to an embodiment of the present application. When the transformer is converted from high capacity to low capacity, the opening and closing of the transformer switch group can be controlled according to the timing action from left to right. In the figure, the first switch TRDA1, TRDB1 and TRDC1 are referred to as TR1, TRDA2, TRDB2 and TRDC2 are referred to as TR2, TRDA5, TRDB5 and TRDC5 are referred to as TR5, TRDA6, TRDB6 and TRDC6 are referred to as TR6, TRDA7, TRDB7 and TRDC7 are referred to as TR7, TRDA8, TRDB8 and TRDC8 are referred to as TR8, TRDA9, TRDB9 and TRDC9 are referred to as TR9, TRDA10, TRDB10 and TRDC10 are referred to as TR10, TRDA111, TRDB111 and TRDC111 are referred to as TR11, and the vacuum switches DA1, GA2, DB1, GB2, DC1 and GC2 are referred to as vacuum switches.

[0037] It should be noted that, in this embodiment, the switches are controlled by a mechanical linkage mechanism to operate in sequence according to the above-mentioned timing. After the switches of the transformer switch group operate according to the above-mentioned timing, the conversion from Dyn11 to Yzn11 between the transformer windings is completed. The transformer capacity adjustment method provided in this embodiment and applied to the above-mentioned transformer can realize the conversion from Dyn11 to Yzn11 between the transformer windings through the above-mentioned timing action, thereby realizing the capacity adjustment process from large capacity to small capacity. It can be understood by those skilled in the art that the capacity adjustment method for adjusting the above-mentioned transformer from small capacity to large capacity is the inverse process of the above-mentioned transformer capacity adjustment method. The adjustment of the transformer from small capacity to large capacity can be completed by performing timing control according to the opposite capacity adjustment process given by the above-mentioned transformer capacity adjustment method.

[0038] It should be noted that the steps shown in the flowcharts of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and that, although a logical order is shown in the flowcharts, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0039] The embodiment of the present application also provides a transformer capacity adjustment device. It should be noted that the transformer capacity adjustment device of the embodiment of the present application can be used to execute the transformer capacity adjustment method provided in the embodiment of the present application. The transformer capacity adjustment device provided in the embodiment of the present application is introduced below.

[0040] Figure 5 Schematic diagram of a transformer capacity adjustment device according to an embodiment of the present application. Figure 5 As shown, the device comprises:

[0041] A first control module 51, used to control the seventh switch of each first switch group from closed to open;

[0042] A second control module 52, configured to control the fifth switch of each first switch group to switch from closed to open after the seventh switch is opened;

[0043] A third control module 53, configured to control the sixth switch of each first switch group from being opened to being closed after the fifth switch is opened;

[0044] a fourth control module 54, configured to control the first vacuum switch of each first switch group from being opened to being closed, and control the second vacuum switch of each second switch group from being opened to being closed, after the sixth switch is closed;

[0045] A fifth control module 55, configured to control the fourth switch of each first switch group from open to closed, and control the ninth switch of each second switch group from open to closed, after the first vacuum switch and the second vacuum switch are closed;

[0046] a sixth control module 56, configured to control the third switch of each first switch group from closed to open, and control the eighth switch of each second switch group from closed to open, after the fourth switch and the ninth switch are closed;

[0047] A seventh control module 57, configured to control the first vacuum switch and the second vacuum switch to switch from closed to open after the third switch and the eighth switch are opened;

[0048] an eighth control module 58, configured to control the first switch of each first switch group from closed to open, and control the tenth switch of each second switch group from closed to open, after the first vacuum switch and the second vacuum switch are opened;

[0049] a ninth control module 59, configured to control the second switch of each first switch group from being opened to being closed, and to control the eleventh switch of each second switch group from being opened to being closed, after the first switch and the tenth switch are opened;

[0050] The tenth control module 60 is used to control the first vacuum switch and the second vacuum switch from being opened to being closed after the second switch and the eleventh switch are closed.

[0051] The transformer capacity regulation device includes a processor and a memory. The above-mentioned first control module 51, second control module 52, third control module 53, fourth control module 54, fifth control module 55, sixth control module 56, seventh control module 57, eighth control module 58, ninth control module 59 and tenth control module 60 are all stored in the memory as program units, and the processor executes the above-mentioned program units stored in the memory to realize corresponding functions.

[0052] Figure 6 Schematic diagram of a transformer capacity adjustment device according to an embodiment of the present application. Figure 6 As shown, the device comprises:

[0053] an eleventh control module 61, configured to control the seventh switch of each first switch group from closed to open;

[0054] A twelfth control module 62, configured to control the sixth switch of each first switch group to switch from open to closed after the seventh switch is opened;

[0055] A thirteenth control module 63, configured to control the fifth switch of each first switch group from closed to open after the sixth switch is closed;

[0056] A fourteenth control module 64, configured to control the first vacuum switch of each first switch group from being opened to being closed, and control the second vacuum switch of each second switch group from being opened to being closed, after the fifth switch is opened;

[0057] A fifteenth control module 65, configured to control the fourth switch of each first switch group from open to closed, and control the ninth switch of each second switch group from open to closed, after the first vacuum switch and the second vacuum switch are closed;

[0058] A sixteenth control module 66, configured to control the third switch of each first switch group from closed to open, and control the eighth switch of each second switch group from closed to open, after the fourth switch and the ninth switch are closed;

[0059] A seventeenth control module 67, configured to control the first vacuum switch and the second vacuum switch from being closed to being opened after the third switch and the eighth switch are opened;

[0060] An eighteenth control module 68, configured to control the first switch of each first switch group from closed to open, and control the tenth switch of each second switch group from closed to open, after the first vacuum switch and the second vacuum switch are opened;

[0061] A nineteenth control module 69, configured to control the second switch of each first switch group from being opened to being closed, and control the eleventh switch of each second switch group from being opened to being closed, after the first switch and the tenth switch are opened;

[0062] The twentieth control module 70 is used to control the first vacuum switch and the second vacuum switch from being opened to being closed after the second switch and the eleventh switch are closed.

[0063] The transformer capacity regulation device includes a processor and a memory. The eleventh control module 61, the twelfth control module 62, the thirteenth control module 63, the fourteenth control module 64, the fifteenth control module 65, the sixteenth control module 66, the seventeenth control module 67, the eighteenth control module 68, the nineteenth control module 69 and the twentieth control module 70 are all stored in the memory as program units, and the processor executes the above program units stored in the memory to realize corresponding functions.

[0064] The serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0065] In the above embodiments of the present invention, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0066] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only schematic. For example, the division of the units can be a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, which can be electrical or other forms.

[0067] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0068] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0069] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a server or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, magnetic disk or optical disk and other media that can store program codes.

[0070] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A transformer, characterized in that: The transformer includes a transformer switch group, and the transformer switch group includes: a first switch group, which is arranged on the low-voltage side of the transformer, and a second switch group, which is arranged on the high-voltage side of the transformer; wherein the first switch group includes: a first vacuum switch, wherein a first switch and a second switch are arranged at a first end of the first vacuum switch, wherein the first switch is arranged between the first end of the first vacuum switch and the first end of the first coil in the low-voltage side coil group of the transformer, and the second switch is arranged between the first end of the first vacuum switch and the second end of the second coil of the first adjacent phase of the transformer; a third switch is arranged between the first end of the first vacuum switch and the low-voltage neutral point; a fourth switch is arranged between the second end of the vacuum switch and the low-voltage neutral point; a first transition resistor is arranged between the second end of the vacuum switch and the second coil of the first adjacent phase of the transformer a fifth switch, arranged between the first end of the second coil in the low-voltage side coil group of the transformer and the low-voltage neutral point; a sixth switch, arranged between the first end of the second coil and the first end of the first coil in the second adjacent phase of the transformer; a seventh switch, arranged between the second end of the second coil and the phase line of the low-voltage side coil group of the transformer; the second switch group includes: a second vacuum switch, an eighth switch is arranged at the first end of the second vacuum switch, and a ninth switch is arranged at the second end of the second vacuum switch; a tenth switch is arranged between the first end of the second vacuum switch and the phase line of the first adjacent phase of the transformer; an eleventh switch is arranged between the first end of the second vacuum switch and the high-voltage neutral point; a second transition resistor is arranged between the second end of the second vacuum switch and the high-voltage neutral point, and the transformer also includes: Three low-voltage side coil groups are arranged on the low-voltage side of the iron core, each low-voltage side coil group includes two groups of coils, the second end of the first coil is connected to the phase line, and the second end of the second coil is connected to the transition resistor of the second adjacent phase; Three groups of high-voltage side coil groups are arranged on the high-voltage side of the iron core, each group of high-voltage side coil groups includes a group of coils, the first end of the second switch group is connected to the first end of a group of coils, the second end of the second switch group is connected to the second end of a group of coils of an adjacent phase, and the third end of the second switch group is connected to a high-voltage neutral point, wherein the eighth switch of the second switch group is arranged between the first end of the second vacuum switch and the first end of the high-voltage side coil group, and the ninth switch of the second switch group is arranged between the second end of the second vacuum switch and the first end of the high-voltage side coil group.

2. A transformer capacity adjustment method, characterized in that: The transformer according to claim 1, comprising: Controlling the seventh switch of each of the first switch groups from closed to open; After the seventh switch is turned off, controlling the fifth switch of each of the first switch groups to be turned from closed to open; After the fifth switch is opened, controlling the sixth switch of each of the first switch groups to switch from open to closed; After the sixth switch is closed, controlling the first vacuum switch of each of the first switch groups to switch from open to closed, and controlling the second vacuum switch of each of the second switch groups to switch from open to closed; After the first vacuum switch and the second vacuum switch are closed, controlling the fourth switch of each of the first switch groups from open to closed, and controlling the ninth switch of each of the second switch groups from open to closed; After the fourth switch and the ninth switch are closed, controlling the third switch of each of the first switch groups to be closed and open, and controlling the eighth switch of each of the second switch groups to be closed and open; After the third switch and the eighth switch are opened, controlling the first vacuum switch and the second vacuum switch to be closed and opened; After the first vacuum switch and the second vacuum switch are disconnected, controlling the first switch of each of the first switch groups to be closed and opened, and controlling the tenth switch of each of the second switch groups to be closed and opened; After the first switch and the tenth switch are opened, controlling the second switch of each of the first switch groups to be opened and closed, and controlling the eleventh switch of each of the second switch groups to be opened and closed; After the second switch and the eleventh switch are closed, the first vacuum switch and the second vacuum switch are controlled from being opened to being closed.

3. A transformer capacity adjustment method, characterized in that: The transformer according to claim 1, comprising: Controlling the seventh switch of each of the first switch groups from closed to open; After the seventh switch is opened, controlling the sixth switch of each of the first switch groups to switch from open to closed; After the sixth switch is closed, controlling the fifth switch of each of the first switch groups to switch from closed to open; After the fifth switch is opened, controlling the first vacuum switch of each of the first switch groups to be opened and closed, and controlling the second vacuum switch of each of the second switch groups to be opened and closed; After the first vacuum switch and the second vacuum switch are closed, controlling the fourth switch of each of the first switch groups from open to closed, and controlling the ninth switch of each of the second switch groups from open to closed; After the fourth switch and the ninth switch are closed, controlling the third switch of each of the first switch groups to be closed and open, and controlling the eighth switch of each of the second switch groups to be closed and open; After the third switch and the eighth switch are opened, controlling the first vacuum switch and the second vacuum switch to be closed and opened; After the first vacuum switch and the second vacuum switch are disconnected, controlling the first switch of each of the first switch groups to be closed and opened, and controlling the tenth switch of each of the second switch groups to be closed and opened; After the first switch and the tenth switch are opened, controlling the second switch of each of the first switch groups to be opened and closed, and controlling the eleventh switch of each of the second switch groups to be opened and closed; After the second switch and the eleventh switch are closed, the first vacuum switch and the second vacuum switch are controlled from being opened to being closed.

4. A transformer capacity adjustment device, characterized in that: The transformer according to claim 1, comprising: A first control module, used for controlling the seventh switch of each of the first switch groups to switch from closed to open; A second control module, configured to control the fifth switch of each of the first switch groups to switch from closed to open after the seventh switch is opened; A third control module, configured to control the sixth switch of each of the first switch groups to switch from being opened to being closed after the fifth switch is opened; a fourth control module, configured to control the first vacuum switch of each of the first switch groups from being opened to being closed, and control the second vacuum switch of each of the second switch groups from being opened to being closed, after the sixth switch is closed; a fifth control module, configured to control the fourth switch of each of the first switch groups from open to closed, and control the ninth switch of each of the second switch groups from open to closed, after the first vacuum switch and the second vacuum switch are closed; a sixth control module, configured to control the third switch of each of the first switch groups from closed to open, and control the eighth switch of each of the second switch groups from closed to open, after the fourth switch and the ninth switch are closed; a seventh control module, configured to control the first vacuum switch and the second vacuum switch to switch from closed to open after the third switch and the eighth switch are opened; an eighth control module, configured to control the first switch of each of the first switch groups from being closed to being open, and control the tenth switch of each of the second switch groups from being closed to being open, after the first vacuum switch and the second vacuum switch are opened; a ninth control module, configured to control the second switch of each of the first switch groups to switch from open to closed, and control the eleventh switch of each of the second switch groups to switch from open to closed, after the first switch and the tenth switch are opened; The tenth control module is used to control the first vacuum switch and the second vacuum switch to switch from opening to closing after the second switch and the eleventh switch are closed.

5. A transformer capacity adjustment device, characterized in that: The transformer according to claim 1, comprising: an eleventh control module, configured to control the seventh switch of each of the first switch groups from closed to open; A twelfth control module, configured to control the sixth switch of each of the first switch groups to switch from being opened to being closed after the seventh switch is opened; A thirteenth control module, configured to control the fifth switch of each of the first switch groups to switch from closed to open after the sixth switch is closed; a fourteenth control module, configured to control the first vacuum switch of each of the first switch groups to switch from open to closed, and control the second vacuum switch of each of the second switch groups to switch from open to closed, after the fifth switch is opened; A fifteenth control module, configured to control the fourth switch of each of the first switch groups from open to closed, and control the ninth switch of each of the second switch groups from open to closed, after the first vacuum switch and the second vacuum switch are closed; A sixteenth control module, configured to control the third switch of each of the first switch groups from closed to open, and control the eighth switch of each of the second switch groups from closed to open, after the fourth switch and the ninth switch are closed; A seventeenth control module, configured to control the first vacuum switch and the second vacuum switch to switch from closed to open after the third switch and the eighth switch are opened; An eighteenth control module, configured to control the first switch of each of the first switch groups to switch from closed to open, and control the tenth switch of each of the second switch groups to switch from closed to open, after the first vacuum switch and the second vacuum switch are disconnected; A nineteenth control module, configured to control the second switch of each of the first switch groups to switch from open to closed, and control the eleventh switch of each of the second switch groups to switch from open to closed, after the first switch and the tenth switch are opened; The twentieth control module is used to control the first vacuum switch and the second vacuum switch to switch from opening to closing after the second switch and the eleventh switch are closed.

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