Static contact assembly and on-load tap-changer

Abstract

The utility model provides a static contact assembly and an on-load tap-changer. The static contact assembly comprises a static contact and a support, the static contact comprises a static contact point, a bearing part used for bearing the static contact point and a wiring part used for leading in current, the support is provided with a fixing hole used for fixing the static contact point and the bearing part, the fixing hole penetrates through the two opposite faces of the support, and the bearing part is used for bearing the bearing part. The fixed contact and the bearing part are arranged in the fixing hole, the area of the side, connected with the bearing part, of the fixed contact is larger than that of the side, connected with the fixed contact, of the bearing part, and the size of the fixing hole is matched with the size of the fixed contact and the size of the bearing part. The working surface of the static contact is increased, the static contact can be reliably contacted with the cylindrical rolling contact, the static contact is stable in installation and operation, the service life of the on-load tap-changer can be prolonged, and the maintenance workload is reduced; the support is made into an upper and lower split structure, and is more suitable for on-load tap-changers of different specifications.

Description

Technical Field

[0001] The utility model relates to the technical field of stationary contacts, in particular to a stationary contact assembly and an on-load tap changer. Background Art

[0002] An on-load tap changer is a voltage regulating device suitable for operating under transformer excitation or load to change the tapping connection position of a transformer winding. It includes a static contact and a moving contact, which contact to form a current loop.

[0003] The contact surface between the static contact and the cylindrical rolling contact of the existing on-load tap changer is too small, resulting in unstable contact. The size of the static contact extending from the support is not well controlled, which can easily cause unstable contact and unsmooth movement with the cylindrical rolling contact, leading to failure of the on-load tap changer. Utility Model Content

[0004] The embodiment of the utility model provides a stationary contact assembly, which can improve the technical problem of unstable contact between the existing stationary contact and the moving contact.

[0005] In the first aspect, an embodiment of the utility model provides a static contact assembly, comprising a static contact and a support, the static contact comprising a static contact point connected in sequence, a bearing part for bearing the static contact point and a wiring part for introducing current, the support is provided with a fixing hole for fixing the static contact point and the bearing part, the fixing hole passes through two opposite sides of the support, the static contact point and the bearing part are arranged in the fixing hole, the area of ​​the side where the static contact point is connected to the bearing part is larger than the area of ​​the side where the bearing part is connected to the static contact, and the size of the fixing hole matches the static contact point and the bearing part.

[0006] The beneficial effects of the embodiments of the utility model are as follows: by setting the area of ​​the side where the static contact is connected to the bearing part to be larger than the area of ​​the side where the bearing part is connected to the static contact, and matching the size of the fixing hole with the static contact and the bearing part, the size of the static contact can be made larger than the size of the bearing part accommodated in the fixing hole, so that the static contact will not move along the axial direction of the fixing hole, thereby making the position of the static contact in the support more stable, and further making the contact between the static contact and the rolling contact more reliable.

[0007] In one embodiment, the static contact and the bearing portion extend along the axial direction of the fixing hole to the outer sides of the two opposite surfaces of the support respectively.

[0008] The beneficial effects of the embodiments of the utility model are as follows: by allowing the static contact to extend through the fixing hole to the outside of two opposite sides of the support, the contact area between the static contact and the rolling contact can be increased, thereby making the contact between the static contact and the rolling contact more reliable.

[0009] In one embodiment, the contact surface of the static contact is square, and a fixing block for fixing the static contact is protruding from one side of the support close to the static contact, and the fixing blocks are arranged on two opposite sides of the static contact.

[0010] The beneficial effect of the embodiment of the utility model is that by setting the contact surface between the static contact and the rolling contact to be square, the contact area between the static contact and the rolling contact can be increased, so that the contact between the static contact and the rolling contact is more reliable.

[0011] In one embodiment, the stationary contact assembly further comprises an insulating member, an end of the bearing portion away from the stationary contact is inserted into the insulating member, and an end of the insulating member away from the bearing portion is connected to a side of the support close to the wiring portion.

[0012] The beneficial effects of the embodiments of the utility model are as follows: by arranging one end of the bearing part in the insulating member and connecting one end of the insulating member away from the bearing part to the support, the overall structural stability of the static contact assembly can be increased.

[0013] In one embodiment, the bearing portion is located inside the insulating component and is sleeved with a sealing ring.

[0014] The beneficial effects of the embodiments of the utility model are as follows: the sealing ring can seal the inside and outside of the insulating part.

[0015] In one embodiment, a shielding cover and a first nut are sleeved on a side of the wiring portion close to the bearing portion, the shielding cover is arranged between the insulating member and the first nut, and an end of the shielding cover away from the wiring portion is connected to a side of the support close to the wiring portion.

[0016] The beneficial effects of the embodiments of the utility model are as follows: the shielding cover can make the electric field uniform, and the two ends of the shielding cover are respectively connected to the static contact and the support, and then fastened by nuts, which can improve the overall structural stability of the static contact assembly.

[0017] In one embodiment, the support includes a first portion and a second portion that are separated, the first portion is provided with the fixing hole, and the second portion is connected to the shielding cover and an end of the insulating member away from the static contact.

[0018] The beneficial effect of the embodiment of the utility model is that the support is arranged in a split manner, so that the static contact assembly can be suitable for on-load tap changers of different specifications.

[0019] In one embodiment, the shielding cover and the insulating member are connected to the second part by bolts, a second nut is provided on the bolt, the second nut is arranged on the side of the shielding cover away from the support, a stop gasket is provided on the bearing part between the first nut and the shielding cover and the bolt between the second nut and the shielding cover, and elastic washers are respectively provided on the bearing part and the bolt between the stop gasket and the shielding cover.

[0020] The beneficial effects of the embodiments of the utility model are as follows: the shielding cover, the insulating member and the second part of the support are connected by bolts and fastened by nuts, so that the overall structural stability of the static contact assembly can be improved. The stop washers and elastic washers can prevent the nuts from loosening.

[0021] In one embodiment, the static contact, the bearing portion and the wiring portion are integrally arranged.

[0022] In a second aspect, an embodiment of the utility model provides an on-load tap changer, comprising the above-mentioned stationary contact assembly.

[0023] Beneficial effects: The utility model increases the working surface of the static contact, which can reliably contact the cylindrical rolling contact. The static contact is stably installed and operates smoothly, which can increase the life of the on-load tap changer and reduce maintenance workload; the support is made into an upper and lower split structure, which is more suitable for on-load tap changers of different specifications. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0025] Figure 1 , 2 It is a three-dimensional schematic diagram of a static contact assembly provided by an embodiment of the utility model;

[0026] Figure 3 It is a three-dimensional schematic diagram of a static contact provided by an embodiment of the utility model;

[0027] Figure 4 It is a three-dimensional schematic diagram of a support provided by an embodiment of the utility model.

[0028] Among them, 10 static contact, 11 static contact point, 111 contact surface, 12 bearing part, 13 wiring part, 14 sealing ring, 15 first nut, 20 support, 21 fixing hole, 22 fixing block, 23 first part, 24 second part, 25 bolt, 26 second nut, 30 insulating part, 40 shielding cover, 50 retaining gasket, 60 elastic gasket. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the utility model, and are not used to limit the utility model. In the utility model, unless otherwise stated, the directional words used, such as "upper" and "lower", generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the accompanying drawings; while "inside" and "outside" refer to the outline of the device. Example

[0030] See also Figures 1 to 4 , an embodiment of the present application provides a stationary contact assembly, including a stationary contact 10 and a support 20. The stationary contact 10 includes a stationary contact 11, a bearing portion 12 for bearing the stationary contact 11, and a wiring portion 13 for introducing current, which are connected in sequence. The stationary contact 11, the bearing portion 12, and the wiring portion 13 are formed in one piece. The support 20 includes a first portion 23 and a second portion 24 that are separated. A fixing hole 21 for fixing the stationary contact 11 and the bearing portion 12 is provided on the first portion 23. The fixing hole 21 passes through two opposite sides of the support 20. The stationary contact 11 and the bearing portion 12 are arranged in the fixing hole 21, and the stationary contact 11 and the bearing portion 12 extend along the axial direction of the fixing hole 21 to the outside of the two opposite sides of the support 20, respectively. The area of ​​the side where the static contact 11 is connected to the bearing part 12 is larger than the area of ​​the side where the bearing part 12 is connected to the static contact 11, and the size of the fixing hole 21 matches the static contact 11 and the bearing part 12, so that the static contact 11 will not move along the fixing hole 21 toward the bearing part 12.

[0031] The contact surface 111 between the static contact 11 and the rolling contact is square. A fixing block 22 for fixing the static contact 11 is protruded on one side of the support 20 close to the static contact 11 by integral molding or screw connection. The fixing block 22 is arranged on two opposite sides of the static contact 11.

[0032] The stationary contact assembly further includes an insulating member 30, a shielding cover 40 and a first nut 15 which are sequentially arranged on the side of the support 20 close to the wiring portion 13. The insulating member 30 is sleeved on the end of the bearing portion 12 away from the stationary contact point 11, and the shielding cover 40 and the first nut 15 are sleeved on the side of the wiring portion 13 close to the bearing portion 12. The bearing portion 12 is located inside the insulating member 30 and is sleeved with a sealing ring 14.

[0033] The end of the insulating member 30 and the shielding cover 40 away from the static contact 10 is connected to the side of the second portion 24 close to the wiring portion 13 by a bolt 25 , and a second nut 26 is provided on the bolt 25 on the side of the shielding cover 40 away from the second portion 24 .

[0034] A retaining washer 50 is sleeved on the bearing portion 12 between the first nut 15 and the shielding cover 40 and the bolt 25 between the second nut 26 and the shielding cover 40 . Elastic washers 60 are sleeved on the bearing portion 12 between the retaining washer 50 and the shielding cover 40 and the bolt 25 , respectively.

[0035] The above is a detailed introduction to the embodiments of the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for technicians in this field, according to the idea of ​​the present invention, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A stationary contact assembly, characterized in that: The invention comprises a stationary contact (10) and a support (20), wherein the stationary contact (10) comprises a stationary contact (11), a bearing portion (12) for bearing the stationary contact (11), and a wiring portion (13) for introducing current, which are connected in sequence; the support (20) is provided with a fixing hole (21) for fixing the stationary contact (11) and the bearing portion (12); the fixing hole (21) passes through two opposite sides of the support (20); the stationary contact (11) and the bearing portion (12) are arranged in the fixing hole (21); the area of ​​a side where the stationary contact (11) is connected to the bearing portion (12) is larger than the area of ​​a side where the bearing portion (12) is connected to the stationary contact (11); and the size of the fixing hole (21) matches the stationary contact (11) and the bearing portion (12).

2. The stationary contact assembly according to claim 1, characterized in that: The static contact (11) and the bearing portion (12) extend along the axial direction of the fixing hole (21) to the outsides of the two opposite surfaces of the support (20).

3. The stationary contact assembly according to claim 1, characterized in that: The contact surface (111) of the static contact (11) is square, and a fixing block (22) for fixing the static contact (11) is protrudingly provided on one side of the support (20) close to the static contact (11), and the fixing block (22) is arranged on two opposite sides of the static contact (11).

4. The stationary contact assembly according to claim 1, characterized in that: The stationary contact assembly further comprises an insulating member (30), wherein one end of the bearing portion (12) away from the stationary contact point (11) is inserted into the insulating member (30), and one end of the insulating member (30) away from the bearing portion (12) is connected to a side of the support (20) close to the wiring portion (13).

5. The stationary contact assembly according to claim 4, characterized in that: The bearing portion (12) is located inside the insulating component (30) and is sleeved with a sealing ring (14).

6. The stationary contact assembly according to claim 4, characterized in that: A shielding cover (40) and a first nut (15) are sleeved on a side of the wiring portion (13) close to the bearing portion (12); the shielding cover (40) is arranged between the insulating member (30) and the first nut (15); and an end of the shielding cover (40) away from the wiring portion (13) is connected to a side of the support (20) close to the wiring portion (13).

7. The stationary contact assembly according to claim 6, characterized in that: The support (20) comprises a first part (23) and a second part (24) which are separated, the first part (23) being provided with the fixing hole (21), and the second part (24) being connected to the shielding cover (40) and an end of the insulating member (30) away from the stationary contact (10).

8. The stationary contact assembly according to claim 7, characterized in that: The shielding cover (40) and the insulating member (30) are connected to the second part (24) via a bolt (25); a second nut (26) is provided on the bolt (25); the second nut (26) is provided on a side of the shielding cover (40) away from the support (20); a stop washer (50) is sleeved on the bearing part (12) between the first nut (15) and the shielding cover (40) and the bolt (25) between the second nut (26) and the shielding cover (40); and elastic washers (60) are sleeved on the bearing part (12) and the bolt (25) between the stop washer (50) and the shielding cover (40), respectively.

9. The stationary contact assembly according to claim 1, characterized in that: The static contact (11), the bearing portion (12) and the wiring portion (13) are integrally arranged.

10. An on-load tap changer, characterized in that: A stationary contact assembly comprising any one of claims 1 to 9.

Images