Single-phase transformer, new energy grid-connected test system and test transformer for new energy grid-connected test system

Abstract

The utility model provides a single-phase transformer, a new energy grid-connected test system and a test transformer used by the new energy grid-connected test system. The single-phase transformer comprises a primary side and a secondary side, the secondary side comprises a plurality of independent winding units, and the winding units are electrically insulated from one another; under the condition that the voltage and the current of the primary side are kept unchanged, the secondary side outputs different voltages by changing the serial connection and / or parallel connection wiring mode of the winding units. The secondary side of the test transformer comprises four independent winding units, and the winding units are electrically insulated from one another; when the primary side access voltage is 6kV and the four winding units are all connected in series, the secondary side outputs 35kV voltage class; when the four winding units are all connected in parallel, the secondary side outputs a 10kV voltage level. According to the new energy grid-connected test system, the three test transformers are utilized to test the alternating current power grids of different voltage levels merged into the new energy power station, and the grid-related characteristic test requirements of the new energy power generation devices of two voltage levels of 10kV and 35kV can be met at the same time.

Description

Technical Field

[0001] The present application relates to the technical field of transformers, and in particular to a single-phase transformer, a new energy grid-connected test system and a test transformer used therefor. Background Art

[0002] The primary and secondary sides of traditional transformers correspond to an input voltage and an output voltage respectively. However, new energy power stations are connected to the grid at two voltage levels: 10kV and 35kV. A new energy grid-connected test system needs to meet the grid-related characteristic test requirements of new energy power generation devices at both 10kV and 35kV voltage levels.

[0003] This also requires a new energy grid-connected test system to be switchable between 10kV and 35kV voltage levels. When the new energy power generation device is connected to the main grid via 10kV, the test transformer used in the new energy grid-connected test system outputs the secondary rated voltage at the 10kV voltage level; when the new energy power generation device is connected to the main grid via 35kV, the test transformer is converted to the 35kV voltage level to output the secondary rated voltage; and it is required that both voltage levels meet the full capacity, and its insulation level is assessed at the higher 35kV voltage level. Utility Model Content

[0004] The present application aims to propose a single-phase transformer, a new energy grid-connected test system and a test transformer used therefor, which are used to solve the problem that a traditional transformer has only one output voltage on the secondary side while the voltage and current on the primary side remain unchanged.

[0005] According to a first aspect of the present application, a single-phase transformer is provided, comprising a primary side and a secondary side, wherein the secondary side comprises a plurality of independent winding units, each winding unit being electrically insulated from each other;

[0006] When the voltage and current of the primary side remain unchanged, the secondary side outputs different voltages by changing the series and / or parallel connection mode of the plurality of winding units.

[0007] According to a second aspect of the present application, a test transformer for a new energy grid-connected test system is provided, comprising a primary side and a secondary side, wherein the secondary side comprises a plurality of independent winding units, and each of the winding units is electrically insulated from each other;

[0008] When the voltage and current of the primary side remain unchanged, the secondary side outputs a first voltage when all the winding units are connected in series, and outputs a second voltage when all the winding units are connected in parallel.

[0009] According to the third aspect of the present application, a new energy grid-connected test system is proposed, which includes three of the aforementioned test transformers, and the three test transformers are used to test the connection of a new energy power station to an AC power grid with different voltage levels, wherein the secondary side of the test transformer includes four independent winding units, and the access voltage on the primary side is 6kV. When all the four winding units are connected in series, the first voltage output by the secondary side is a 35kV voltage level; when all the four winding units are connected in parallel, the second voltage output by the secondary side is a 10kV voltage level.

[0010] Compared with the prior art, the beneficial effects of this application are:

[0011] Compared with the traditional transformer, the single-phase transformer proposed in the present application includes a plurality of independent winding units on the secondary side, and each winding unit is electrically insulated from each other; when the voltage and current on the primary side remain unchanged, by changing the series and / or parallel connection mode of the plurality of winding units, the secondary side can output different voltages. Similarly, compared with the traditional transformer, the test transformer for the new energy grid-connected test system proposed in the present application includes a plurality of independent winding units on the secondary side, and each winding unit is electrically insulated from each other; when the voltage and current on the primary side remain unchanged, when all the plurality of winding units are connected in series, the secondary side outputs a first voltage, and when all the plurality of winding units are connected in parallel, the secondary side outputs a second voltage. This solves the problem that the secondary side of the traditional transformer can only output one voltage when the voltage and current on the primary side remain unchanged. With the single-phase transformer or test transformer of the present application, when the input voltage on the primary side is the same, the secondary side can output two or more different voltages as needed.

[0012] The new energy grid-connected test system proposed in the present application utilizes three test transformers of the present application to test the connection of new energy power stations to AC power grids of different voltage levels, wherein the secondary side of the test transformer includes four independent winding units, and the access voltage on the primary side is 6kV. When all the four winding units are connected in series, the first voltage output by the secondary side is a 35kV voltage level; when all the four winding units are connected in parallel, the second voltage output by the secondary side is a 10kV voltage level, so that a new energy grid-connected test system can be used in both 10kV and 35kV voltage levels at the same time, thereby meeting the grid-related characteristic test requirements of new energy power generation devices at both 10kV and 35kV voltage levels. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The accompanying drawings are only used to illustrate specific embodiments and are not considered to be limiting of the present application. In the entire drawings, the same reference symbols represent the same components. In the drawings:

[0014] Figure 1 This is a schematic diagram of the primary and secondary sides of the transformer;

[0015] Figure 2 This is a schematic diagram of the series connection of the secondary side of the transformer proposed in this application;

[0016] Figure 3 This is a schematic diagram of the parallel wiring of the secondary side of the transformer proposed in this application. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solution and advantages of the present application clearer, the technical solution of the present application will be clearly and completely described below in combination with the specific embodiments of the present application and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application.

[0018] The design concept of the present application is to address the problem that in a traditional transformer, when the voltage and current on the primary side remain unchanged, the secondary side has only one output voltage. The present application proposes a test transformer for a single-phase transformer and a new energy grid-connected test system, and the secondary side includes a plurality of independent winding units, each winding unit is electrically insulated from each other, and by changing the series and / or parallel wiring mode of the plurality of winding units, for example, when all the plurality of secondary winding units are connected in series or in parallel, the secondary side can output two different voltages.

[0019] The technical solutions provided by various embodiments of the present application are described in detail below in conjunction with the accompanying drawings.

[0020] Example 1

[0021] According to the first aspect of the present application, embodiment 1 of the present application proposes a single-phase transformer, see Figure 1 As shown, it includes a primary side and a secondary side, and the secondary side includes a plurality of independent winding units ( Figure 1 (not shown), each winding unit is electrically insulated from each other; when the voltage and current on the primary side remain unchanged, the secondary side outputs different voltages by changing the series and / or parallel connection mode of the plurality of winding units.

[0022] In order to avoid the situation where multiple independent winding units are wound on the same coil at the same time and the height is too large, resulting in an unsightly appearance or an uncoordinated size of the single-phase transformer, and also to facilitate the series and / or parallel connection of multiple independent winding units, according to some embodiments of the present application, the secondary side adopts a multi-segment coil structure, the multiple coils are arranged in parallel, and the multiple winding units are divided into corresponding groups and wound on the multiple coils. For example, the secondary side adopts a two-segment coil structure, the two coils are arranged in parallel, and the multiple winding units are divided into two groups and wound on the two coils, which can halve the overall height of the single-phase transformer and design the appearance of the single-phase transformer in a more beautiful or coordinated way.

[0023] According to some embodiments of the present application, the specifications of each winding unit are the same. The specifications of all winding units are unified, which can simplify the manufacturing process of the transformer.

[0024] According to some embodiments of the present application, the specifications of each winding unit are not completely the same. This design is conducive to combining more wiring modes by connecting the same number of winding units in series and / or in parallel, thereby increasing the number of different voltages output by the secondary side.

[0025] In summary, compared with the traditional transformer, the single-phase transformer proposed in the present application includes a plurality of independent winding units on the secondary side, and each winding unit is electrically insulated from each other; when the voltage and current on the primary side remain unchanged, by changing the series and / or parallel connection mode of the plurality of winding units, the secondary side can output different voltages. This solves the problem that the secondary side can only output one voltage when the voltage and current on the primary side of the traditional transformer remain unchanged. With the single-phase transformer of the present application, when the input voltage on the primary side is the same, the secondary side can output a variety of different voltages as needed.

[0026] Example 2

[0027] According to the second aspect of the present application, the embodiment 2 of the present application proposes a test transformer for a new energy grid-connected test system, combined with Figure 1-Figure 3 As shown, it includes a primary side and a secondary side, the secondary side includes a plurality of independent winding units, each winding unit is electrically insulated from each other; when the voltage and current of the primary side remain unchanged, when all the plurality of winding units are connected in series, the secondary side outputs a first voltage (see Figure 2 ), when all the winding units are connected in parallel, the secondary side outputs a second voltage (see Figure 3 ).

[0028] According to some embodiments of the present application, see Figure 2 and Figure 3The secondary side adopts a two-segment coil structure, the two-segment coils are arranged in parallel, and the plurality of winding units are divided into two groups and wound on the two-segment coils. By dividing the plurality of winding units into two groups and winding them on the two-segment coils on the secondary side, the overall height of the test transformer can be reduced by half, and the appearance design can be more beautiful and coordinated.

[0029] Further, according to some embodiments of the present application, the secondary side includes an even number of winding units, and each winding unit has the same specifications. The even number of winding units is evenly divided into two groups and wound on two sections of the secondary side coil, and each winding unit has a uniform specification, so that the number and specifications of the windings on the two sections of the coil are exactly the same, which can simplify the manufacturing process of the transformer.

[0030] According to some embodiments of the present application, see Figure 2 and Figure 3 As shown, the secondary side specifically includes four winding units: A1X1, A2X2, A3X3, A4X4, wherein A1, A2, A3, A4 are heads of the four winding units, respectively, and X1, X2, X3, X4 are tails of the four winding units, respectively. The four windings of the secondary side are wound evenly on two coil sections, the four winding units are electrically insulated and independent from each other, and two winding units are wound on each coil section.

[0031] According to some embodiments of the present application, by designing the number of turns of the windings on the primary side and the secondary side, the access voltage on the primary side is 6kV; when all four winding units on the secondary side are connected in series, refer to Figure 2 , connect X1 to A2, X2 to A3, X3 to A4, the first voltage output on the secondary side is 35kV voltage level; when all four winding units on the secondary side are connected in parallel, refer to Figure 3 , connect A1, A2, A3, A4, connect X1, X2, X3, X4, and the secondary side outputs the second voltage at 10kV voltage level. This specifically meets the needs of the new energy grid-connected test system to switch between the two voltage levels of 10kV and 35kV.

[0032] In summary, compared with traditional transformers, the test transformer for the new energy grid-connected test system proposed in the present application includes multiple independent winding units on the secondary side, and each of the winding units is electrically insulated from each other; when the voltage and current on the primary side remain unchanged, the secondary side outputs a first voltage when all the multiple winding units are connected in series, and outputs a second voltage when all the multiple winding units are connected in parallel. This solves the problem that the secondary side of a traditional transformer can only output one voltage when the voltage and current on the primary side remain unchanged. With the test transformer of the present application, when the input voltage on the primary side is the same, the secondary side can output two different voltages as needed.

[0033] Example 3

[0034] According to the third aspect of the present application, Example 3 of the present application also proposes a new energy grid-connected test system, which includes three of the aforementioned test transformers, and uses the three test transformers to test the new energy power station connected to AC power grids of different voltage levels. Among them, the secondary side of the test transformer includes four independent winding units, and the access voltage on the primary side is 6kV. When all the four winding units are connected in series, the first voltage output by the secondary side is a 35kV voltage level; when all the four winding units are connected in parallel, the second voltage output by the secondary side is a 10kV voltage level. Therefore, a new energy grid-connected test system can be used in both 10kV and 35kV voltage levels at the same time, and meet the grid-related characteristic test requirements of new energy power generation devices at both 10kV and 35kV voltage levels.

[0035] Finally, it should be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion. Without further restrictions, the elements defined by the sentence "comprises..." do not exclude the existence of additional identical elements in the process, method, product or equipment that includes the elements.

[0036] The serial numbers of the embodiments of the present application are only for description and do not represent the advantages or disadvantages of the embodiments. In the above embodiments of the present application, the description of each embodiment has its own emphasis. For parts not described in detail in one embodiment, please refer to the relevant description of other embodiments.

Claims

1. A single-phase transformer, comprising a primary side and a secondary side, characterized in that: The secondary side includes a plurality of independent winding units, each winding unit being electrically insulated from each other; When the voltage and current of the primary side remain unchanged, the secondary side outputs different voltages by changing the series and / or parallel connection mode of the plurality of winding units.

2. The single-phase transformer according to claim 1, characterized in that: The secondary side adopts a multi-segment coil structure, the multi-segment coils are arranged in parallel, and the plurality of winding units are divided into corresponding groups and wound on the multi-segment coils.

3. The single-phase transformer according to claim 1, characterized in that: The specifications of each winding unit are the same.

4. The single-phase transformer according to claim 1, characterized in that: The specifications of each winding unit are not exactly the same.

5. A test transformer for a new energy grid-connected test system, comprising a primary side and a secondary side, characterized in that: The secondary side includes a plurality of independent winding units, each of which is electrically insulated from each other; When the voltage and current of the primary side remain unchanged, the secondary side outputs a first voltage when all the winding units are connected in series, and outputs a second voltage when all the winding units are connected in parallel.

6. The test transformer according to claim 5, characterized in that: The secondary side adopts a two-section coil structure, the two sections of coils are arranged in parallel, and the plurality of winding units are divided into two groups and wound on the two sections of coils.

7. The test transformer according to claim 6, characterized in that The secondary side includes an even number of the winding units, and the specifications of each winding unit are the same.

8. The test transformer according to claim 7, characterized in that: The secondary side includes four winding units.

9. The test transformer according to claim 8, characterized in that: The access voltage of the primary side is 6kV; when all four winding units are connected in series, the first voltage output by the secondary side is a 35kV voltage level; when all four winding units are connected in parallel, the second voltage output by the secondary side is a 10kV voltage level.

10. A new energy grid-connected test system, characterized in that: The test system comprises three test transformers as claimed in claim 9, and the three test transformers are used to test the connection of a new energy power station to an AC power grid of different voltage levels.

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