A voltage equalizing cap for transformer discharge test
By installing elastic clips and support plates inside the sleeve of the transformer equalizing cap, the clamping force of the conductive rod is enhanced, which solves the problem of unreliable contact between the equalizing cap and the bushing conductive rod, and achieves reliable contact and prevents loosening.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- XIAN FOSEN ENG CO LTD
- Filing Date
- 2025-05-30
- Publication Date
- 2026-06-16
AI Technical Summary
The existing transformer equalizing cap has unreliable contact with the bushing conductive rod, posing a risk of poor connection and is prone to loosening.
An elastic clamp and an elastic support plate are installed inside the sleeve of the equalizing cap. The movable end of the elastic clamp overlaps the elastic support plate to enhance the clamping force of the conductive rod and ensure reliable contact.
This improves the contact reliability between the equalizing cap and the conductive rod of the bushing, avoids incomplete connections, and prevents the equalizing cap from becoming loose.
Smart Images
Figure CN224366070U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of transformer testing technology, and in particular to an equalizing cap for transformer discharge testing. Background Technology
[0002] The electric field around a high-voltage bushing tends to concentrate at the top, forming a high-field-strength region. Therefore, before conducting a partial discharge test on a transformer, an equalizing cap needs to be installed on the high-voltage side bushing to reduce the local field strength, improve the electric field distribution, and prevent insulation breakdown. However, when the equalizing cap is placed on the bushing, unreliable contact can easily occur between the cap and the bushing's conductive rod, posing a risk of incomplete connection. Summary of the Invention
[0003] Purpose of the invention: In order to overcome the shortcomings of the existing technology, this utility model provides an equalizing cap for transformer discharge testing, which aims to improve the contact reliability between the equalizing cap and the bushing conductive rod.
[0004] Technical Solution: To achieve the above objectives, this utility model provides an equalizing cap for transformer discharge testing, comprising a crown-shaped cap shell, with a sleeve disposed inside the cap shell. The sleeve wall is divided into elastic clamping pieces and elastic support pieces. The elastic clamping piece includes a fixed end, a clamping section, and a movable end connected in sequence. The fixed end is connected to the sleeve, the clamping section extends into the inner cavity of the sleeve, and the movable end overlaps the elastic support piece. When an insert inside the sleeve pushes the clamping section outward, the elastic support piece provides support to the movable end.
[0005] Furthermore, the lower end of the sleeve is an insertion port, the elastic clip is disposed near the insertion port, and the elastic support piece is disposed above the elastic clip.
[0006] Furthermore, the sleeve has an upper groove and a lower groove on its cylindrical wall; the elastic clamp is separated from the lower groove, with the lower end of the elastic clamp being the fixed end and the upper end being the movable end; the elastic support plate is separated from the upper groove, and the elastic support plate is folded down and overlaps with the movable end.
[0007] Furthermore, the movable end gradually tilts outward from the sleeve from top to bottom, and the elastic support piece is folded down to form a downward inclined section, with the movable end and the downward inclined section overlapping obliquely.
[0008] Furthermore, there is a guide section between the clamping section and the fixed end, and the guide section gradually slopes upward toward the inner cavity of the sleeve.
[0009] Furthermore, the lower end of the guide section extends outside the sleeve, and the lower end of the guide section is connected to the fixed end through an outer inclined section, which gradually slopes outward from top to bottom towards the outside of the sleeve.
[0010] Furthermore, on the sleeve, the overlapping elastic clips and elastic support pieces form a clamping unit, and at least two clamping units are distributed circumferentially on the sleeve.
[0011] Furthermore, a reinforcing frame is connected between the outer wall of the sleeve and the inner wall of the cap.
[0012] Beneficial effects: The present invention provides an equalizing cap for transformer discharge testing. Inside the cap shell is a sleeve. When the equalizing cap is installed on the transformer bushing, the conductive rod is inserted into the sleeve. Inside the sleeve are elastic clamps and elastic support plates. With the cooperation of the elastic clamps and elastic support plates, the conductive rod can be reliably clamped, avoiding incomplete connections. Attached Figure Description
[0013] Appendix Figure 1 This is a schematic diagram of the pressure equalization cap of this utility model. Detailed Implementation
[0014] The present invention will be further described below with reference to the accompanying drawings.
[0015] As attached Figure 1 The voltage equalization cap for transformer discharge testing includes a crown-shaped cap shell 1, as shown in the attached figure. Figure 1 In one embodiment shown, the cap 1 is composed of an upper hemispherical structure and a lower cylindrical structure. A sleeve 2 is disposed inside the cap 1, corresponding to the conductive rod on the high-voltage bushing of the transformer. When the equalizing cap is installed on the high-voltage bushing, the conductive rod is inserted into the sleeve 2. The inner diameter of the sleeve 2 is the same as the outer diameter of the conductive rod. Both the sleeve 2 and the cap 1 are metal conductors. Due to the smooth curved surface design on the cap 1, the effective area can be increased, reducing the local electric field strength. However, if the contact between the sleeve 2 and the conductive rod is unreliable, a loose connection may occur, and the equalizing cap may easily detach from the conductive rod. Therefore, it is necessary to strengthen the reliability of the contact between the sleeve 2 and the conductive rod.
[0016] Specifically, in this application, the sleeve 2 has elastic clamping pieces 3 and elastic support pieces 4 divided into sections on its cylindrical wall. The elastic clamping piece 3 includes a fixed end 5, a clamping section 6, and a movable end 7 connected sequentially from bottom to top. The fixed end 5 is connected to the sleeve 2, the clamping section 6 extends into the inner cavity of the sleeve 2, and the movable end 7 rests on the elastic support piece 4. When the insert inside the sleeve 2 pushes the clamping section 6 outward, the elastic support piece 4 provides support for the movable end 7.
[0017] As attached Figure 1As shown, since the clamping section 6 is located inside the sleeve 2, when the conductive rod is inserted into the sleeve 2, the conductive rod will push the clamping section 6 outward. Conversely, the clamping section 6 will clamp onto the conductive rod, thus forming a reliable contact between the conductive rod and the equalizing cap. However, since the elastic clip 3 is separated from the sleeve 2, and the fixed end 5 of the elastic clip 3 is connected to the sleeve 2 while the movable end 7 is not, when the elastic clip 3 is subjected to compression, the part of the elastic clip 3 near the movable end 7 is more prone to deformation than the part near the fixed end 5. Conversely, the clamping effect of the part of the elastic clip 3 near the movable end 7 on the conductive rod is weaker than that of the part near the fixed end 5. Therefore, the contact reliability between the part of the elastic clip 3 near the movable end 7 and the conductive rod is poor, and intermittent contact is likely to occur.
[0018] To address the aforementioned issues, this application additionally incorporates an elastic support plate 4, with the movable end 7 of the elastic clamping plate 3 resting on the elastic support plate 4. Due to the supporting effect of the elastic support plate 4 on the elastic clamping plate 3, the elastic coefficient of the portion of the elastic clamping plate 3 near the movable end 7 increases. Therefore, when the conductive rod is inserted into the sleeve 2, the clamping force of the portion of the elastic clamping plate 3 near the movable end 7 is better. Consequently, the contact between the entire elastic clamping plate 3 and the conductive rod is more reliable, reducing the likelihood of intermittent contact, and the equalizing cap is less likely to detach from the conductive rod.
[0019] The lower end of the sleeve 2 is an insertion port, and the conductive rod is inserted upward into the sleeve 2 through the insertion port. The elastic clamp 3 is positioned close to the insertion port, and the elastic support plate 4 is positioned above the elastic clamp 3.
[0020] Since the elastic clamping piece 3 and the elastic support piece 4 are separated from the sleeve 2, an upper groove 8 and a lower groove 9 are left on the sleeve 2 after the elastic clamping piece 3 and the elastic support piece 4 are separated. The elastic clamping piece 3 is separated from the lower groove 9, with the lower end of the elastic clamping piece 3 being the fixed end 5 and the upper end of the elastic clamping piece 3 being the movable end 7. The elastic support piece 4 is separated from the upper groove 8, and after being folded downwards, it overlaps with the movable end 7.
[0021] The movable end 7 gradually slopes outward from top to bottom towards the sleeve 2, and the elastic support piece 4 folds downward to form a downward sloping section 10. The movable end 7 and the downward sloping section 10 are obliquely overlapped. When the elastic clamping piece 3 is subjected to outward compression, the movable end 7 and the downward sloping section 10 can maintain oblique overlap, ensuring that the elastic support piece 4 can provide support force to the movable end 7.
[0022] There is a guide section 11 between the clamping section 6 and the fixed end 5. The guide section 11 gradually slopes upward toward the inner cavity of the sleeve 2. Since the outer diameter of the conductive rod is the same as the inner diameter of the sleeve 2, and the clamping section 6 is located in the inner cavity of the sleeve 2, the presence of the guide section 11 allows the conductive rod to gradually press upward toward the clamping section 6 along the guide section 11.
[0023] The lower end of the guide section 11 extends outside the sleeve 2. The lower end of the guide section 11 is connected to the fixed end 5 through the outer inclined section 12, which gradually slopes outward from top to bottom towards the sleeve 2. Due to the presence of the outer inclined section 12, the lower end of the guide section 11 extends outside the sleeve 2, so the guide section 11 can be gradually squeezed during the upward insertion of the conductive rod into the sleeve 2.
[0024] On the sleeve 2, the overlapping elastic clamping piece 3 and the elastic support piece 4 constitute a clamping unit, and at least two clamping units are circumferentially distributed on the sleeve 2. In one embodiment, four clamping units are circumferentially distributed at equal angles on the sleeve 2. With the cooperation of multiple clamping units, the contact between the sleeve 2 and the guide rod is more reliable.
[0025] A reinforcing frame 13 is connected between the outer wall of the sleeve 2 and the inner wall of the cap 1 to maintain the structural stability of the sleeve 2.
[0026] The equalizing cap of this invention is applied to the high-voltage bushing of a transformer. The conductive rod of the high-voltage bushing is inserted into the sleeve 2. The elastic clip 3 and elastic support 4 inside the sleeve 2 cooperate with each other to form a reliable contact between the conductive rod and the sleeve 2, preventing loose connections, and the equalizing cap is not easy to loosen.
[0027] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.
Claims
1. An equalizing cap for transformer discharge testing, characterized in that: The device includes a crown-shaped cap (1), inside which is a sleeve (2). The sleeve (2) has elastic clips (3) and elastic support pieces (4) divided into its cylindrical wall. The elastic clips (3) include a fixed end (5), a clamping section (6), and a movable end (7) connected in sequence. The fixed end (5) is connected to the sleeve (2), the clamping section (6) extends into the inner cavity of the sleeve (2), and the movable end (7) overlaps the elastic support piece (4). When the insert in the sleeve (2) pushes the clamping section (6) outward, the elastic support piece (4) provides support for the movable end (7).
2. The equalizing cap for transformer discharge testing according to claim 1, characterized in that: The lower end of the sleeve (2) is the insertion port, the elastic clip (3) is located near the insertion port, and the elastic support piece (4) is located above the elastic clip (3).
3. The equalizing cap for transformer discharge testing according to claim 2, characterized in that: The sleeve (2) has an upper groove (8) and a lower groove (9) on its cylindrical wall; the elastic clip (3) is separated from the lower groove (9), the lower end of the elastic clip (3) is the fixed end (5), and the upper end of the elastic clip (3) is the movable end (7); the elastic support piece (4) is separated from the upper groove (8), and the elastic support piece (4) is folded down and overlaps with the movable end (7).
4. The equalizing cap for transformer discharge testing according to claim 3, characterized in that: The movable end (7) gradually tilts outward from the sleeve (2) from top to bottom. The elastic support piece (4) is folded down to form a downward inclined section (10). The movable end (7) and the downward inclined section (10) overlap obliquely.
5. The equalizing cap for transformer discharge testing according to claim 3, characterized in that: There is a guide section (11) between the clamping section (6) and the fixed end (5), and the guide section (11) gradually tilts from bottom to top toward the inner cavity of the sleeve (2).
6. The equalizing cap for transformer discharge testing according to claim 5, characterized in that: The lower end of the guide section (11) extends out of the sleeve (2). The lower end of the guide section (11) is connected to the fixed end (5) through the outer inclined section (12). The outer inclined section (12) gradually slopes outward from the sleeve (2) from top to bottom.
7. The equalizing cap for transformer discharge testing according to claim 1, characterized in that: On the sleeve (2), the overlapping elastic clamping piece (3) and the elastic support piece (4) form a clamping unit, and at least two clamping units are distributed circumferentially on the sleeve (2).
8. The equalizing cap for transformer discharge testing according to claim 1, characterized in that: A reinforcing frame (13) is connected between the outer wall of the sleeve (2) and the inner wall of the cap (1).