Arrangement structure of a single-phase auto-variable flux-regulating transformer

Abstract

The present invention discloses a layout structure of a single-phase auto-coupling flux-regulating transformer, which specifically relates to the field of transformers. The single-phase auto-coupling flux-regulating transformer comprises an oil tank, and a high-voltage side and a low-voltage side are respectively arranged on both sides of the oil tank. A high-voltage winding and a medium-voltage winding are installed inside the oil tank. The high-voltage winding is composed of a series coil, a common coil, and a voltage-regulating coil, and the medium-voltage winding is composed of a common coil and a voltage-regulating coil. The present invention arranges the high-voltage winding outlet, the medium-voltage winding outlet, and the neutral point outlet on the high-voltage side, so that the winding will not have a half-turn problem, and the voltage deviation rate will be reduced accordingly. The high-voltage winding outlet and the medium-voltage winding outlet are respectively connected to the high-voltage bushing and the medium-voltage bushing nearby, and the neutral point lead is led out from the switch, so that the lead arrangement is simple, and the crossover of the outlet leads is prevented. The voltage-regulating coil is arranged on the side column of the core, and there are fewer coils on the main column of the core, so that the electrical calculation of the short-circuit impedance is easier, and the interference item is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of transformers, and more particularly to an arrangement structure of a single-phase auto-variable flux-regulating transformer. Background Art

[0002] There are two conventional voltage regulation methods for single-phase autotransformers: constant flux voltage regulation and variable flux voltage regulation. In the constant flux voltage regulation method, the switch is placed between the series coil and the common coil. During voltage regulation, the number of turns of the high-voltage winding does not change, and the magnetic flux does not change. In the variable flux voltage regulation method, the switch is placed at the neutral point at the end of the common coil. During voltage regulation, the number of turns of the high-voltage winding changes, and the magnetic flux also changes.

[0003] In the prior art, the transformers of power grids in some areas of the south choose the neutral point variable flux voltage regulation method. Compared with the end voltage regulation method, the advantage of the neutral point variable flux voltage regulation method is that since the switch is arranged at the neutral point, the voltage level of the neutral point is lower than that of the common coil end, which can reduce the insulation level requirements for the switch, thereby reducing the insulation level of the tap lead, and the insulation distance of the lead is easy to ensure.

[0004] Due to the layout structure of the existing single-phase auto-variable flux-regulating transformer, the high-voltage winding outlet, medium-voltage winding outlet and neutral point outlet are not on the same side, which causes the winding to have a half-turn problem, resulting in a corresponding increase in the voltage deviation rate. Summary of the invention

[0005] The present invention provides a layout structure of a single-phase autotransformer flux-regulating transformer, and aims to solve the problem that: in the existing layout structure of a single-phase autotransformer flux-regulating transformer, the high-voltage winding outlet, the medium-voltage winding outlet and the neutral point outlet are not on the same side, resulting in a half-turn problem in the winding.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an arrangement structure of a single-phase autotransformer flux-regulating transformer, the single-phase autotransformer flux-regulating transformer comprising an oil tank, a high-voltage side and a low-voltage side are respectively arranged on both sides of the oil tank, a high-voltage winding and a medium-voltage winding are installed inside the oil tank, the high-voltage winding is composed of a series coil, a common coil, and a voltage-regulating coil, the medium-voltage winding is composed of a common coil and a voltage-regulating coil, a neutral point is arranged at the end of the high-voltage winding and the end of the medium-voltage winding, the output end of the high-voltage winding is connected to the high-voltage winding outlet, the output end of the medium-voltage winding is connected to the medium-voltage winding outlet, the output end of the neutral point is connected to the neutral point outlet, and the high-voltage winding outlet, the medium-voltage winding outlet and the neutral point outlet are all located on the high-voltage side of the oil tank.

[0007] In a preferred embodiment, an iron core is provided inside the oil tank, the iron core includes an iron core main column and an iron core side column, and the iron core side column is located on one side of the iron core main column, the series coil and the common coil are both arranged on the iron core main column, and the voltage regulating coil is arranged on the iron core side column.

[0008] In a preferred embodiment, a medium-voltage bushing is provided between the core main column and the core side column, and the medium-voltage bushing is located on the high-voltage side of the oil tank, and the medium-voltage winding outlet is connected to the medium-voltage bushing.

[0009] In a preferred embodiment, a switch is further provided on the high-pressure side of the oil tank, and the switch is located outside the medium-pressure bushing, and the voltage regulating lead connecting line is connected to the voltage regulating coil outlet line through the switch.

[0010] In a preferred embodiment, a voltage regulating lead connecting line is connected between the core main column and the switch, and the voltage regulating lead connecting line is bypassed along a side of the medium voltage bushing away from the core side column.

[0011] In a preferred embodiment, a neutral point bushing is installed on the low-pressure side of the oil tank, and a neutral point lead is connected between the switch and the neutral point bushing.

[0012] In a preferred embodiment, a high-voltage bushing is provided at the output end of the high-voltage winding output line, and the high-voltage bushing is located on the high-voltage side of the oil tank.

[0013] The beneficial effects of the present invention are:

[0014] The present invention arranges the high-voltage winding outlet, the medium-voltage winding outlet and the neutral point outlet on the high-voltage side, so that the winding will not have a half-turn problem, the voltage deviation rate will be reduced accordingly, the high-voltage winding outlet and the medium-voltage winding outlet are respectively connected to the high-voltage bushing and the medium-voltage bushing nearby, the neutral point lead is led out from the switch and connected to the neutral point bushing nearby, so that the lead arrangement is simple, and the crossing of the outlet leads is prevented, the voltage regulating coil is arranged on the side column of the iron core, the coils on the main column of the iron core are few, the electrical calculation of the short-circuit impedance is easier, and the interference items are reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is the wiring schematic diagram of the variable flux voltage regulation of the present invention.

[0016] Figure 2 It is a top view of the arrangement method of the variable flux voltage regulating transformer of the present invention.

[0017] Figure 3 It is a front view of the arrangement method of the variable flux voltage regulating transformer of the present invention.

[0018] The accompanying drawings are marked as follows: 1. oil tank; 2. iron core main column; 3. iron core side column; 4. series coil; 5. common coil; 6. voltage regulating coil; 7. high-voltage winding outlet; 8. high-voltage bushing; 9. medium-voltage winding outlet; 10. medium-voltage bushing; 11. voltage regulating lead connecting line; 12. voltage regulating coil outlet; 13. switch; 14. neutral point lead; 15. neutral point bushing. DETAILED DESCRIPTION

[0019] The present application is further described in detail below in conjunction with the accompanying drawings. It is necessary to point out here that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technical personnel in this field can make some non-essential improvements and adjustments to the present application based on the above application content.

[0020] Refer to the instruction manual Figures 1 to 3 , an arrangement structure of a single-phase autotransformer flux-regulating transformer, the single-phase autotransformer flux-regulating transformer comprises an oil tank 1, a high-voltage side and a low-voltage side are respectively arranged on both sides of the oil tank 1, a high-voltage winding and a medium-voltage winding are installed inside the oil tank 1, the high-voltage winding is composed of a series coil 4, a common coil 5, and a voltage-regulating coil 6, the medium-voltage winding is composed of a common coil 5 and a voltage-regulating coil 6, the ends of the high-voltage winding and the ends of the medium-voltage winding are both provided with a neutral point, the output end of the high-voltage winding is connected to a high-voltage winding outlet line 7, the output end of the medium-voltage winding is connected to a medium-voltage winding outlet line 9, the output end of the neutral point is connected to a neutral point outlet line, the high-voltage winding outlet line 7, the medium-voltage winding outlet line 9 and the neutral point outlet line are all located on the high-voltage side of the oil tank 1.

[0021] Furthermore, an iron core is provided inside the oil tank 1, and the iron core includes an iron core main column 2 and an iron core side column 3, and the iron core side column 3 is located on one side of the iron core main column 2, the series coil 4 and the common coil 5 are both arranged on the iron core main column 2, and the voltage regulating coil 6 is arranged on the iron core side column 3.

[0022] Furthermore, a medium-voltage bushing 10 is provided between the core main column 2 and the core side column 3 , and the medium-voltage bushing 10 is located on the high-voltage side of the oil tank 1 , and the medium-voltage winding outlet line 9 is connected to the medium-voltage bushing 10 .

[0023] Furthermore, a switch 13 is provided on the high-pressure side of the oil tank 1 , and the switch 13 is located outside the medium-pressure bushing 10 , and the voltage regulating lead connecting line 11 and the voltage regulating coil outlet line 12 are connected via the switch 13 .

[0024] Furthermore, a voltage regulating lead connecting line 11 is connected between the core main column 2 and the switch 13 , and the voltage regulating lead connecting line 11 is bypassed along a side of the medium voltage bushing 10 away from the core side column 3 .

[0025] Furthermore, a neutral point bushing 15 is installed on the low-pressure side of the oil tank 1 , and a neutral point lead 14 is connected between the switch 13 and the neutral point bushing 15 .

[0026] Furthermore, a high-voltage bushing 8 is provided at the output end of the high-voltage winding output line 7 , and the high-voltage bushing 8 is located at the high-voltage side of the oil tank 1 .

[0027] In this embodiment, the implementation scenario is specifically as follows: the high-voltage winding of the transformer is composed of a series coil 4, a common coil 5, and a voltage regulating coil 6, the medium-voltage winding is composed of a common coil 5 and a voltage regulating coil 6, the ends of the high-voltage winding and the medium-voltage winding are both neutral points, the oil tank 1 is an ordinary rectangular oil tank, the iron core is a single-phase double-frame iron core, composed of an iron core main column 2, an iron core side column 3 and a side yoke, the series coil 4 and the common coil 5 are arranged on the iron core main column 2, and the voltage regulating coil 6 is arranged at the iron core side column 3, so that the medium-voltage outlet, the high-voltage outlet and the neutral point outlet are all on the high-voltage side, the medium-voltage bushing 10 is arranged between the high-voltage side iron core main column 2 and the iron core side column 3, the switch 13 is arranged on the same side of the medium-voltage bushing 10, the neutral point bushing 15 is arranged on the low-voltage side, the high-voltage winding outlet 7 is connected to the high-voltage bushing 8 nearby, the medium-voltage winding outlet 9 is connected to the medium-voltage bushing 10 nearby, and the voltage regulating outlet The line connection line 11 is connected to the switch 13 from the lower space of the high-voltage winding and the medium-voltage winding, the voltage regulating coil outlet line 12 is connected to the switch 13 nearby, the voltage regulating lead connection line 11 is connected to the voltage regulating coil outlet line 12 through the switch 13, and then the neutral point lead line 14 is connected to the neutral point bushing 15 from the switch 13 on the high-voltage side. The high-voltage winding outlet line 7, the medium-voltage winding outlet line 9 and the neutral point outlet line are all on the high-voltage side, so that the winding will not have a half-turn problem, and the voltage deviation rate will be reduced accordingly. The high-voltage winding outlet line 7 and the medium-voltage winding outlet line 9 are respectively connected to the high-voltage bushing 8 and the medium-voltage bushing 10 nearby, and the neutral point lead line 14 is led out from the switch 13 and connected to the neutral point bushing 15 nearby. In this way, the lead arrangement is simple to prevent the outlet lead lines from crossing. The voltage regulating coil 6 is arranged on the core side column 3, and there are fewer coils on the core main column 2. The electrical calculation of the short-circuit impedance is easier, reducing interference items.

[0028] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A single-phase auto-variable flux-regulating transformer arrangement structure, characterized in that: The single-phase autovariable flux voltage regulating transformer comprises an oil tank (1), wherein the two sides of the oil tank (1) are respectively provided with a high-voltage side and a low-voltage side, and a high-voltage winding and a medium-voltage winding are installed inside the oil tank (1), wherein the high-voltage winding is composed of a series coil (4), a common coil (5), and a voltage regulating coil (6), and the medium-voltage winding is composed of a common coil (5) and a voltage regulating coil (6), and the ends of the high-voltage winding and the ends of the medium-voltage winding are both provided with a neutral point, the output end of the high-voltage winding is connected to a high-voltage winding outlet line (7), the output end of the medium-voltage winding is connected to a medium-voltage winding outlet line (9), and the output end of the neutral point is connected to a neutral point outlet line, and the high-voltage winding outlet line (7), the medium-voltage winding outlet line (9), and the neutral point outlet line are all located on the high-voltage side of the oil tank (1); and a high-voltage bushing (8) is provided at the output end of the high-voltage winding outlet line (7), and the high-voltage bushing (8) is located on the high-voltage side of the oil tank (1).

2. The arrangement structure of a single-phase auto-variable flux-regulating transformer according to claim 1 is characterized in that: An iron core is provided inside the oil tank (1), the iron core comprising an iron core main column (2) and an iron core side column (3), wherein the iron core side column (3) is located on one side of the iron core main column (2), the series coil (4) and the common coil (5) are both provided on the iron core main column (2), and the voltage regulating coil (6) is provided on the iron core side column (3).

3. The arrangement structure of a single-phase auto-variable flux-regulating transformer according to claim 2 is characterized in that: A medium-voltage bushing (10) is provided between the core main column (2) and the core side column (3), and the medium-voltage bushing (10) is located on the high-voltage side of the oil tank (1), and the medium-voltage winding outlet line (9) is connected to the medium-voltage bushing (10).

4. The arrangement structure of a single-phase auto-variable flux-regulating transformer according to claim 3 is characterized in that: A switch (13) is also provided on the high-pressure side of the oil tank (1), and the switch (13) is located outside the medium-pressure bushing (10), and the voltage regulating lead connecting wire (11) and the voltage regulating coil outlet wire (12) are connected via the switch (13).

5. The arrangement structure of a single-phase auto-variable flux-regulating transformer according to claim 4 is characterized in that: A voltage regulating lead connecting line (11) is connected between the core main column (2) and the switch (13), and the voltage regulating lead connecting line (11) is bypassed along a side of the medium voltage bushing (10) away from the core side column (3).

6. The arrangement structure of a single-phase auto-variable flux-regulating transformer according to claim 5, characterized in that: A neutral point bushing (15) is installed on the low-pressure side of the oil tank (1), and a neutral point lead (14) is connected between the switch (13) and the neutral point bushing (15).

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