Single-phase dry-type transformer for electrified railway

Abstract

The utility model relates to a single-phase dry-type transformer for an electrified railway. The single-phase dry-type transformer comprises a middle column iron core, an upper yoke iron core, a lower yoke iron core, a left side column iron core, a right side column iron core, a high-voltage side upper clamping plate, a low-voltage side upper clamping plate, a high-voltage side lower clamping plate, a low-voltage side lower clamping plate, a base, a high-voltage coil, a low-voltage coil, an insulating cylinder, an upper insulating cushion block and a lower insulating cushion block. According to the transformer, magnetic circuits in the iron core assembly can be distributed more evenly, the strength of the iron core assembly is greatly improved, the damage degree of faults to the transformer is reduced, the heat dissipation area is increased, dissipation of heat in the transformer is facilitated, magnetic circuit distribution is improved, magnetic flux evenly circulates in the iron core assembly, and the service life of the transformer is prolonged. The local magnetic saturation phenomenon is reduced, so that the overall loss of the iron core assembly is reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to transformer technical field, the utility model discloses a kind of 27.5kV electrification railway single-phase dry-type transformer. BACKGROUND

[0002] With the rapid development of electrified railway, higher requirements are put forward for transformers in railway power supply system. When the traditional transformer is applied to 27.5KV electrified railway, there are problems such as high loss, poor energy-saving effect, unsatisfactory insulation performance and insufficient ability to adapt to complex railway environment. In order to meet the efficient, stable and energy-saving needs of railway power supply, a new type of transformer is urgently needed to overcome these defects. SUMMARY

[0003] The utility model discloses a kind of single-phase dry-type transformers for electrification railway, which overcomes the deficiencies in the prior art.

[0004] According to the technical scheme provided by the utility model, the single-phase dry-type transformer for electrification railway includes a center column iron core, an upper yoke iron core, a lower yoke iron core, a left side column iron core, a right side column iron core, a high-voltage side upper clamping plate, a low-voltage side upper clamping plate, a high-voltage side lower clamping plate, a low-voltage side lower clamping plate, a base, a high-voltage coil, a low-voltage coil, an insulation cylinder, an upper insulation pad and a lower insulation pad.

[0005] The upper yoke iron core is fixed to the upper end of the center column iron core, and the lower yoke iron core is fixed to the lower end of the center column iron core. The upper end of the left side column iron core is fixed to the left end of the upper yoke iron core, and the lower end of the left side column iron core is fixed to the left end of the lower yoke iron core. The upper end of the right side column iron core is fixed to the right end of the upper yoke iron core, and the lower end of the right side column iron core is fixed to the right end of the lower yoke iron core.

[0006] The high-voltage side upper clamping plate and the low-voltage side upper clamping plate are fixed together, with the high-voltage side upper clamping plate located in front of the upper yoke iron core and the low-voltage side upper clamping plate located behind the upper yoke iron core. The high-voltage side lower clamping plate and the low-voltage side lower clamping plate are fixed together, with the high-voltage side lower clamping plate located in front of the lower yoke iron core and the low-voltage side lower clamping plate located behind the lower yoke iron core. The base is fixed to the lower side of the high-voltage side lower clamping plate and the low-voltage side lower clamping plate.

[0007] The low-voltage coil is wrapped around the outside of the center column iron core, and the high-voltage coil is wrapped around the outside of the low-voltage coil. An insulation cylinder is provided between the high-voltage coil and the low-voltage coil.

[0008] The upper ends of the high-voltage coil and the low-voltage coil are supported by a plurality of the upper insulation pads, the upper ends of some of the upper insulation pads are fixed with the high-voltage side upper clamping plate, and the upper ends of the rest of the upper insulation pads are fixed with the low-voltage side upper clamping plate; the lower ends of the high-voltage coil and the low-voltage coil are supported by a plurality of the lower insulation pads, the lower ends of some of the lower insulation pads are fixed with the high-voltage side lower clamping plate, and the lower ends of the rest of the lower insulation pads are fixed with the low-voltage side lower clamping plate.

[0009] The upper end of the insulation cylinder is embedded in the upper insulation pad, and the lower end of the insulation cylinder is embedded in the lower insulation pad.

[0010] Preferably, the lower end of the upper insulation pad is embedded between the high-voltage coil and the low-voltage coil.

[0011] Preferably, the upper end of the lower insulation pad is embedded between the high-voltage coil and the low-voltage coil.

[0012] The utility model discloses a transformer, which can make the magnetic circuit distribution in the iron core assembly more uniform, greatly improve the strength of the iron core assembly, reduce the damage degree of the transformer caused by faults, and increase the heat dissipation area, thereby helping to dissipate the heat inside the transformer, improving the magnetic circuit distribution, making the magnetic flux flow uniformly in the iron core assembly, reducing the local magnetic saturation phenomenon, and thus reducing the overall loss of the iron core assembly. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is the front view of the utility model.

[0014] Figure 2 It is the left view of the utility model. DETAILED DESCRIPTION

[0015] To make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme of the utility model will be described clearly and completely below in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor belong to the protection scope of the utility model.

[0016] A single-phase dry-type transformer for electrified railways comprises a middle column iron core 1, an upper yoke iron core 2, a lower yoke iron core 3, a left side column iron core 4, a right side column iron core 5, a high-voltage side upper clamping plate 6, a low-voltage side upper clamping plate 7, a high-voltage side lower clamping plate 8, a low-voltage side lower clamping plate 9, a base 10, a high-voltage coil 11, a low-voltage coil 12, an insulation cylinder 13, upper insulation pads 14 and lower insulation pads 15.

[0017] The upper yoke core 2 is fixed at the upper end of the middle column core 1, the lower yoke core 3 is fixed at the lower end of the middle column core 1, the upper end of the left side limb core 4 is fixed with the left end of the upper yoke core 2, the lower end of the left side limb core 4 is fixed with the left end of the lower yoke core 3, the upper end of the right side limb core 5 is fixed with the right end of the upper yoke core 2, and the lower end of the right side limb core 5 is fixed with the right end of the lower yoke core 3;

[0018] The high-voltage side upper clamping plate 6 and the low-voltage side upper clamping plate 7 are fixed together, the high-voltage side upper clamping plate 6 is located at the front side of the upper yoke core 2, the low-voltage side upper clamping plate 7 is located at the rear side of the upper yoke core 2, the high-voltage side lower clamping plate 8 and the low-voltage side lower clamping plate 9 are fixed together, the high-voltage side lower clamping plate 8 is located at the front side of the lower yoke core 3, and the low-voltage side lower clamping plate 9 is located at the rear side of the lower yoke core 3, and the base 10 is fixed at the lower side of the high-voltage side lower clamping plate 8 and the low-voltage side lower clamping plate 9;

[0019] The low-voltage coil 12 is sleeved outside the middle column core 1, the high-voltage coil 11 is sleeved outside the low-voltage coil 12, and the insulating cylinder 13 is arranged between the high-voltage coil 11 and the low-voltage coil 12;

[0020] The upper ends of the high-voltage coil 11 and the low-voltage coil 12 are supported by a plurality of upper insulating pads 14, the upper ends of part of the upper insulating pads 14 are fixed with the high-voltage side upper clamping plate 6, and the upper ends of the remaining upper insulating pads 14 are fixed with the low-voltage side upper clamping plate 7, and the lower ends of the high-voltage coil 11 and the low-voltage coil 12 are supported by a plurality of lower insulating pads 15, the lower ends of part of the lower insulating pads 15 are fixed with the high-voltage side lower clamping plate 8, and the lower ends of the remaining lower insulating pads 15 are fixed with the low-voltage side lower clamping plate 9;

[0021] The upper end of the insulating cylinder 13 is embedded in the upper insulating pad 14, and the lower end of the insulating cylinder 13 is embedded in the lower insulating pad 15.

[0022] The lower end of the upper insulating pad 14 is embedded between the high-voltage coil 11 and the low-voltage coil 12.

[0023] The upper end of the lower insulating pad 15 is embedded between the high-voltage coil 11 and the low-voltage coil 12.

[0024] In the utility model, the middle column core 1, the upper yoke core 2, the lower yoke core 3, the left side limb core 4 and the right side limb core 5 are fixed and connected to form the core assembly, so that the following advantages are obtained:

[0025] 1、Can make the magnetic circuit distribution in the iron core assembly more uniform. Because in the single-phase transformer, the magnetic flux is mainly concentrated on the middle column iron core 1, the upper yoke iron core 2, the lower yoke iron core 3, the left side side column iron core 4 and the right side side column iron core 5 can play the role of balancing and guiding the magnetic flux, so that the magnetic flux flows better in the whole iron core, avoiding the situation that the local magnetic flux density is too high or too low, thereby improving the magnetic performance and working stability of the transformer. At the same time, uniform magnetic circuit distribution also helps to reduce the local overheating phenomenon of the iron core assembly, prolonging the service life of the transformer. Furthermore, uniform magnetic circuit and stable structure help to reduce the vibration and noise of the transformer during operation, making the magnetic flux change more stable, reducing the vibration of the iron core assembly caused by the sharp change of the magnetic flux, thereby reducing the noise level of the transformer of the utility model and improving the working environment.

[0026] 2、Can greatly improve the strength of the iron core assembly, so that the transformer of the utility model can better withstand external mechanical stress, such as vibration during transportation, impact force during installation, etc. For some harsh working environment, it may be affected by a large mechanical force, so that the transformer of the utility model has better reliability.

[0027] 3、In the case of short circuit of the coil winding and other faults, the upper yoke iron core 2, the lower yoke iron core 3, the left side side column iron core 4 and the right side side column iron core 5 can provide additional support for the middle column iron core 1, reduce the deformation degree of the middle column iron core 1, and reduce the damage degree of the transformer of the utility model caused by the fault.

[0028] 4、Increase the heat dissipation area, which is helpful to the dissipation of heat inside the transformer of the utility model. Because in the process of transformer operation, the iron core assembly, the high-voltage coil 11 and the low-voltage coil 12 will generate heat, good heat dissipation performance can ensure that the transformer of the utility model works within the allowable temperature range, improving the overload capacity and reliability of the transformer of the utility model.

[0029] 5、Improve the magnetic circuit distribution, so that the magnetic flux flows uniformly in the iron core assembly, reducing the local magnetic saturation phenomenon, thereby reducing the overall loss of the iron core assembly.

[0030] Finally, it should be pointed out that the above specific embodiments are only used to illustrate the technical scheme of the utility model and not to limit it. Although the utility model has been described in detail with reference to the examples, those skilled in the art should understand that the technical scheme of the utility model can be modified or replaced equivalently without departing from the spirit and scope of the utility model technical scheme, which should be covered in the scope of the claims of the utility model.

Claims

1. A single-phase dry-type transformer for electrified railways, characterized by: It includes the center column iron core (1), the upper yoke iron core (2), the lower yoke iron core (3), the left side side column iron core (4), the right side side column iron core (5), the high voltage side upper clamping plate (6), the low voltage side upper clamping plate (7), the high voltage side lower clamping plate (8), the low voltage side lower clamping plate (9), the base (10), the high voltage coil (11), the low voltage coil (12), the insulation cylinder (13), the upper insulation pad (14) and the lower insulation pad (15). The upper yoke iron core (2) is fixed at the upper end of the center column iron core (1), the lower yoke iron core (3) is fixed at the lower end of the center column iron core (1), the upper end of the left side side column iron core (4) is fixed with the left end of the upper yoke iron core (2), the lower end of the left side side column iron core (4) is fixed with the left end of the lower yoke iron core (3), the upper end of the right side side column iron core (5) is fixed with the right end of the upper yoke iron core (2), and the lower end of the right side side column iron core (5) is fixed with the right end of the lower yoke iron core (3). The high voltage side upper clamping plate (6) and the low voltage side upper clamping plate (7) are fixed together, the high voltage side upper clamping plate (6) is located at the front side of the upper yoke iron core (2), the low voltage side upper clamping plate (7) is located at the rear side of the upper yoke iron core (2), the high voltage side lower clamping plate (8) and the low voltage side lower clamping plate (9) are fixed together, the high voltage side lower clamping plate (8) is located at the front side of the lower yoke iron core (3), and the low voltage side lower clamping plate (9) is located at the rear side of the lower yoke iron core (3), and the base (10) is fixed at the lower side of the high voltage side lower clamping plate (8) and the low voltage side lower clamping plate (9). The low voltage coil (12) is sleeved outside the center column iron core (1), the high voltage coil (11) is sleeved outside the low voltage coil (12), and the insulation cylinder (13) is arranged between the high voltage coil (11) and the low voltage coil (12). The upper ends of the high voltage coil (11) and the low voltage coil (12) are supported by a plurality of upper insulation pads (14), the upper ends of part of the upper insulation pads (14) are fixed with the high voltage side upper clamping plate (6), and the upper ends of the remaining upper insulation pads (14) are fixed with the low voltage side upper clamping plate (7); the lower ends of the high voltage coil (11) and the low voltage coil (12) are supported by a plurality of lower insulation pads (15), the lower ends of part of the lower insulation pads (15) are fixed with the high voltage side lower clamping plate (8), and the lower ends of the remaining lower insulation pads (15) are fixed with the low voltage side lower clamping plate (9). The upper end of the insulation cylinder (13) is embedded in the upper insulation pad (14), and the lower end of the insulation cylinder (13) is embedded in the lower insulation pad (15).

2. The single-phase dry-type transformer for electrified railways as claimed in claim 1, characterized in that: The lower end of the upper insulation pad (14) is embedded between the high voltage coil (11) and the low voltage coil (12).

3. The single-phase dry-type transformer for electrified railways as claimed in claim 1, characterized in that: The upper end of the lower insulation pad (15) is embedded between the high voltage coil (11) and the low voltage coil (12).

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