27.5 kV oil-immersed transformer for railway station

Abstract

The utility model discloses a 27.5 kV oil-immersed transformer for a railway. The 27.5 kV oil-immersed transformer comprises an upper iron yoke, a lower iron yoke, an iron core, a low-voltage coil, a high-voltage coil, an angle ring, a high-low insulation isolation mechanism and an end insulation isolation mechanism, the upper iron yoke is arranged above the lower iron yoke, the iron core is installed between the upper iron yoke and the lower iron yoke, the low-voltage coil is wound outside the iron core, the high-voltage coil is wound outside the low-voltage coil, and the low-voltage coil and the high-voltage coil are isolated through the high-low insulation isolation mechanism. Extending-in grooves are formed in the two ends of the high-low insulation isolation mechanism, the angle ring comprises a first ring body and a second ring body, the end of the first ring body protrudes outwards to form the second ring body, the extending-in grooves allow the first ring body to extend in, and the second ring body covers the end face of the high-voltage coil in an extending mode; the high-voltage coil comprises an upper sub-coil and a lower sub-coil. The 27.5 kV oil-immersed transformer for the railway solves the problem that in the prior art, insulation isolation between a high-voltage coil and a low-voltage coil cannot be achieved under the condition that installation can be guaranteed.

Description

Technical Field

[0001] The utility model relates to a transformer, in particular to a 27.5kV oil-immersed transformer used in railways. Background Art

[0002] A Chinese patent discloses a new type of 35KV oil-immersed transformer high-voltage segmented layer coil with application number: CN201720092040.2. A new type of 35KV oil-immersed transformer high-voltage segmented layer coil includes: a low-voltage coil and a high-voltage coil. The high-voltage coil includes: a plurality of sub-coils arranged in segments in the vertical direction, each sub-coil is provided with a concave angle ring, and the two side edges of the concave angle ring are respectively arranged on the upper high-voltage end ring and the lower high-voltage end ring of the sub-coil, and the bottom edge of the concave angle ring is arranged on the vertical end surface of the sub-coil close to the low-voltage coil.

[0003] Although the new 35KV oil-immersed transformer high-voltage segmented layer coil reduces the lateral magnetic leakage between the segmented coils, the new 35KV oil-immersed transformer high-voltage segmented layer coil still has the following disadvantages: since the sub-coil is placed in the groove on the outer wall of the concave angle ring, the two ends of the concave angle ring will block the sub-coil from being placed in. Generally, the angle ring does not allow a separate design, and the sub-coil cannot be placed in the groove on the outer wall of the concave angle ring. Therefore, how to achieve insulation isolation between the high-voltage coil and the low-voltage coil while ensuring installation is an urgent problem to be solved. Utility Model Content

[0004] The utility model provides a 27.5kV oil-immersed transformer for railways, which solves the problem in the prior art that insulation isolation between a high-voltage coil and a low-voltage coil cannot be achieved while ensuring installation.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] The utility model discloses a 27.5kV oil-immersed transformer used in railways, comprising: an upper iron yoke, a lower iron yoke, an iron core, a low-voltage coil, a high-voltage coil, an angle ring, a high-low insulation isolation mechanism and an end insulation isolation mechanism; the upper iron yoke is arranged above the upper iron yoke, an iron core is installed between the upper iron yoke and the lower iron yoke, a low-voltage coil is surrounded by the iron core, a high-voltage coil is surrounded by the low-voltage coil, and the low-voltage coil and the high-voltage coil are isolated by the high-low insulation isolation mechanism; insertion grooves are formed at both ends of the high-low insulation isolation mechanism, the angle ring comprises: a first ring body and a second ring body, the end of the first ring body protrudes outward to form the second ring body, the insertion groove is for the first ring body to be inserted into, and the second ring body extends to cover the end face of the high-voltage coil; the high-voltage coil comprises: an upper sub-coil and a lower sub-coil, the upper sub-coil is located above the lower sub-coil, and the upper sub-coil and the lower sub-coil are isolated by the end insulation isolation mechanism.

[0007] Preferably, the high-low insulation isolation mechanism includes: a first support curtain, a second support curtain, a third support curtain, a first cardboard, a second cardboard and a third cardboard, the first support curtain surrounds the low-voltage coil, the second support curtain surrounds the first support curtain, the third support curtain surrounds the second support curtain, the first cardboard is clamped between the first support curtain and the second support curtain, the second cardboard is clamped between the second support curtain and the third support curtain, and the third cardboard is clamped between the third support curtain and the inner wall of the high-voltage coil.

[0008] Preferably, an electrostatic shielding layer is clamped between the third paperboard and the inner wall of the high-voltage coil.

[0009] Preferably, the height of the second stay curtain is smaller than the heights of the first stay curtain and the third stay curtain, so as to form an insertion groove between the first paperboard and the second paperboard.

[0010] Preferably, the end insulation isolation mechanism includes: a first high-voltage wire insulation end ring and a second high-voltage wire insulation end ring, the first high-voltage wire insulation end ring is installed at the end of the upper sub-coil and the end of the lower sub-coil, and the second high-voltage wire insulation end ring is clamped between the two first high-voltage wire insulation end rings located between the upper sub-coil and the lower sub-coil.

[0011] Preferably, first high-voltage wire insulation end rings are installed at both ends of the upper sub-coil and both ends of the lower sub-coil, the thickness d1 of the first high-voltage wire insulation end ring is greater than the high-voltage coil d2, and a high-voltage insulation layer is surrounded by the upper sub-coil and the lower sub-coil, and the high-voltage insulation layer is located between the two first high-voltage wire insulation end rings.

[0012] Preferably, an end ring is installed between the bottom first high-voltage line insulation end ring or the top first high-voltage line insulation end ring and the corner ring.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] In the present application, a concave angle ring is not used in the prior art, but an annular structure high-low insulation isolation mechanism is used to isolate the high-voltage coil and the low-voltage coil, and at the same time, an annular structure end insulation isolation mechanism is used to isolate the upper sub-coil and the lower sub-coil in the high-voltage coil, thereby avoiding the problem of being unable to install the high-voltage coil in the groove of the outer wall of the concave angle ring. The annular structure high-low insulation isolation mechanism and the end insulation isolation mechanism realize that the high-voltage coil can be installed by simply putting it in place, thereby avoiding the need to produce high-voltage coils with concave angle rings in the prior art, which leads to troublesome production steps. At the same time, the high-low insulation isolation mechanism in the present application is provided with an insertion groove for the first ring body of the angle ring to be inserted, so that the gap between the angle ring and the end insulation isolation mechanism is blocked by the insertion groove wall, thereby increasing the creepage distance and reducing the risk of leakage in the gap between the angle ring and the end insulation isolation mechanism, thereby ensuring the insulation isolation effect.

[0015] Other advantages, objectives and features of the present invention will be reflected in part through the following description, and in part will be understood by those skilled in the art through research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a structural diagram of a 27.5kV oil-immersed transformer used in railways.

[0017] Figure 2 It is a structural diagram of the high-voltage coil, the high-low insulation isolation mechanism and the end insulation isolation mechanism.

[0018] Figure numerals: upper iron yoke 1, lower iron yoke 2, low-voltage coil 3, high-voltage coil 4, upper sub-coil 41, lower sub-coil 42, corner ring 5, high-low insulation isolation mechanism 6, first support curtain 61, second support curtain 62, third support curtain 63, first cardboard 64, second cardboard 65, third cardboard 66, electrostatic shielding layer 67, end insulation isolation mechanism 7, first high-voltage line insulation end ring 71, second high-voltage line insulation end ring 72, high-voltage insulation layer 8, end ring 9. DETAILED DESCRIPTION

[0019] In order to make the technical means, creative features, objectives and functions of the present invention clearer and easier to understand, the present invention is further described below with reference to the accompanying drawings and specific embodiments:

[0020] like Figure 1 as well as Figure 2 As shown, the utility model discloses a 27.5kV oil-immersed transformer used in railways, comprising: an upper iron yoke 1, a lower iron yoke 2, an iron core (not shown in the figure), a low-voltage coil 3, a high-voltage coil 4, an angle ring 5, a high-low insulation isolation mechanism 6 and an end insulation isolation mechanism 7; the upper iron yoke 1 is arranged above the upper iron yoke 1, and an iron core is installed between the upper iron yoke 1 and the lower iron yoke 2, the low-voltage coil 3 is surrounded by the iron core, and the high-voltage coil 4 is surrounded by the low-voltage coil 3, and the low-voltage coil 3 is isolated from the high-voltage coil 4 by the high-low insulation isolation mechanism 6; an insertion groove is formed at both ends of the high-low insulation isolation mechanism 6, and the angle ring 5 includes: a first ring body and a second ring body, the end of the first ring body protrudes outward to form the second ring body, the insertion groove is for the first ring body to be inserted, and the second ring body extends to cover the end face of the high-voltage coil 4; the high-voltage coil 4 includes: an upper sub-coil 41 and a lower sub-coil 42, the upper sub-coil 41 is located above the lower sub-coil 42, and the upper sub-coil 41 and the lower sub-coil 42 are isolated by the end insulation isolation mechanism 7.

[0021] The high-low insulation isolation mechanism 6 includes a first support curtain 61, a second support curtain 62, a third support curtain 63, a first cardboard 64, a second cardboard 65, and a third cardboard 66. The first support curtain 61 surrounds the low-voltage coil 3, the second support curtain 62 surrounds the first support curtain 61, and the third support curtain 63 surrounds the second support curtain 62. The first cardboard 64 is clamped between the first and second support curtains 61, 62, the second cardboard 65 is clamped between the second and third support curtains 62, 63, and the third cardboard 66 is clamped between the third support curtain 63 and the inner wall of the high-voltage coil 4. The first support curtain 61 ensures that the first cardboard 64 can be installed between the low-voltage coil 3 and the high-voltage coil 4, and that there is a gap between the first cardboard 64 and the low-voltage coil 3. The second support curtain 62 ensures that the second cardboard 65 can be installed between the first cardboard 64 and the high-voltage coil 4, and that there is a gap between the second cardboard 65 and the first cardboard 64. The third support curtain 63 ensures that the second cardboard 65 can be installed between the second cardboard 65 and the high-voltage coil 4, and also ensures that there is a gap between the third cardboard 66 and the second cardboard 65. The first cardboard 64, the second cardboard 65, and the third cardboard 66 serve as insulation between the high-voltage coil 4 and the low-voltage coil 3.

[0022] An electrostatic shielding layer 67 is clamped between the third paperboard 66 and the inner wall of the high-voltage coil 4. The electrostatic shielding layer 67 plays a role in removing static electricity.

[0023] The height of the second stay curtain 62 is smaller than the height of the first stay curtain 61 and the height of the third stay curtain 63, so as to form an insertion slot between the first cardboard 64 and the second cardboard 65. This ensures the formation of the insertion slot and avoids the need to create the insertion slot on the component, which would cause operational difficulties.

[0024] The end insulation isolation mechanism 7 includes a first high-voltage wire insulation end ring 71 and a second high-voltage wire insulation end ring 72. The first high-voltage wire insulation end ring 71 is installed at the ends of the upper sub-coil 41 and the lower sub-coil 42. The second high-voltage wire insulation end ring 72 is clamped between the two first high-voltage wire insulation end rings 71 between the upper sub-coil 41 and the lower sub-coil 42. The first high-voltage wire insulation end ring 71 and the second high-voltage wire insulation end ring 72 provide insulation between the upper sub-coil 41 and the lower sub-coil 42.

[0025] First high-voltage wire insulation end rings 71 are installed at both ends of the upper sub-coil 41 and both ends of the lower sub-coil 42. The thickness d1 of the first high-voltage wire insulation end ring 71 is greater than that of the high-voltage coil 4d2. This size design enables the two first high-voltage wire insulation end rings 71 to have the function of limiting the high-voltage insulation layer 8. The upper sub-coil 41 and the lower sub-coil 42 are surrounded by a high-voltage insulation layer 8, and the high-voltage insulation layer 8 is located between the two first high-voltage wire insulation end rings 71.

[0026] An end ring 9 is installed between the lowermost first high-voltage line insulation end ring 71 or the uppermost first high-voltage line insulation end ring 71 and the angle ring 5. The end ring 9 plays an insulating and isolating role.

[0027] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model and are not limiting. Although the utility model is described in detail with reference to the preferred embodiments, ordinary technicians in this field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A 27.5kV oil-immersed transformer for railway use, characterized in that: include: An upper iron yoke (1), a lower iron yoke (2), an iron core, a low-voltage coil (3), a high-voltage coil (4), an angle ring (5), a high-low insulation isolation mechanism (6), and an end insulation isolation mechanism (7); An upper iron yoke (1) is arranged above the upper iron yoke (1), an iron core is installed between the upper iron yoke (1) and the lower iron yoke (2), a low-voltage coil (3) is wound around the iron core, a high-voltage coil (4) is wound around the low-voltage coil (3), and the low-voltage coil (3) and the high-voltage coil (4) are isolated by a high-low insulation isolation mechanism (6); Insertion grooves are formed at both ends of the high-low insulation isolation mechanism (6), and the angle ring (5) includes a first ring body and a second ring body. The end of the first ring body protrudes outward to form the second ring body. The insertion groove is for the first ring body to be inserted, and the second ring body extends to cover the end face of the high-voltage coil (4); The high-voltage coil (4) comprises an upper sub-coil (41) and a lower sub-coil (42), wherein the upper sub-coil (41) is located above the lower sub-coil (42), and the upper sub-coil (41) and the lower sub-coil (42) are isolated by an end insulation isolation mechanism (7).

2. A 27.5kV oil-immersed transformer for railway use according to claim 1, characterized in that: The high-low insulation isolation mechanism (6) includes: a first support curtain (61), a second support curtain (62), a third support curtain (63), a first cardboard (64), a second cardboard (65) and a third cardboard (66). The first support curtain (61) surrounds the outside of the low-voltage coil (3), the second support curtain (62) surrounds the outside of the first support curtain (61), and the third support curtain (63) surrounds the outside of the second support curtain (62). The first cardboard (64) is clamped between the first support curtain (61) and the second support curtain (62), the second cardboard (65) is clamped between the second support curtain (62) and the third support curtain (63), and the third cardboard (66) is clamped between the third support curtain (63) and the inner wall of the high-voltage coil (4).

3. The 27.5kV oil-immersed transformer for railway use according to claim 2, characterized in that: An electrostatic shielding layer (67) is clamped between the third paperboard (66) and the inner wall of the high-voltage coil (4).

4. A 27.5kV oil-immersed transformer for railway use according to claim 2 or 3, characterized in that: The height of the second stay curtain (62) is smaller than the height of the first stay curtain (61) and the height of the third stay curtain (63), so as to form an insertion groove between the first paperboard (64) and the second paperboard (65).

5. The 27.5kV oil-immersed transformer for railway use according to claim 1, characterized in that: The end insulation isolation mechanism (7) comprises: a first high-voltage line insulation end ring (71) and a second high-voltage line insulation end ring (72); the first high-voltage line insulation end ring (71) is mounted on the end of the upper sub-coil (41) and the end of the lower sub-coil (42); the second high-voltage line insulation end ring (72) is clamped between the two first high-voltage line insulation end rings (71) located between the upper sub-coil (41) and the lower sub-coil (42).

6. The 27.5kV oil-immersed transformer for railway use according to claim 5, characterized in that: First high-voltage wire insulation end rings (71) are installed at both ends of the upper sub-coil (41) and both ends of the lower sub-coil (42). The thickness d1 of the first high-voltage wire insulation end rings (71) is greater than d2 of the high-voltage coil (4). A high-voltage insulation layer (8) surrounds the outer surface of the upper sub-coil (41) and the lower sub-coil (42). The high-voltage insulation layer (8) is located between the two first high-voltage wire insulation end rings (71).

7. The 27.5kV oil-immersed transformer for railway use according to claim 6, characterized in that: An end ring (9) is installed between the lowermost first high-voltage line insulation end ring (71) or the uppermost first high-voltage line insulation end ring (71) and the corner ring (5).

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