Transformer neutral point disconnecting link porcelain insulator anti-falling structure
By designing neutral point columns, ground columns and protection line structures on the neutral point knife switch of the transformer, the problem of breaking and falling in the insulated porcelain bottle during rotation is solved, and safe and reliable operation protection is achieved.
Patent Information
- Application Number
- CN202422219128.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-10
- Publication Date
- 2025-07-04
- Estimated Expiration
- 2034-09-10
AI Technical Summary
When the neutral point knife switch of the transformer is opened and closed, the rotation of the knife switch contact may cause the insulating porcelain bottle to break and fall, posing a safety hazard.
A neutral point knife switch insulated porcelain bottle anti-fall structure of transformer is designed, including neutral point columns, ground columns and protection lines. The protection line is made of multiple strands of soft copper wire, and the two ends are crimped with copper wire noses and coated with anti-corrosion structures. The grounding wire is connected to fix the broken porcelain bottle to ensure that the porcelain bottle does not fall.
When the insulated porcelain bottle is broken, the protection wire pulls the porcelain bottle to prevent it from falling and protects the safety of the operator. By enhancing the strength and grounding effect of the protection wire, the resistance is reduced and the operation stability is ensured.
Smart Images
Figure CN223065953U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the fields of electric switches and emergency protection devices in the electrical field, and particularly to a switch operated by directly acting a solid on an operating member rotatable about a pivot, specifically a structure for preventing the insulating porcelain bottle of a transformer neutral point knife switch from falling. Background Art
[0002] The neutral point knife switch of a transformer is one of the main components of the transformer and is a functional device for the zero-sequence protection of the transformer. In the power system, when the operation mode changes, it is necessary to adjust the position of the neutral point knife switch to make it conform to the operating state of the power system. The transformer neutral point knife switch uses a porcelain bottle as an insulating medium. When the transformer neutral point knife switch is switched on or off, the moving contact of the knife switch rotates under the drive of the opening and closing drive mechanism to control the moving contact of the knife switch to contact or form a visible gap with the static contact of the knife switch, and the transformer neutral point is correspondingly adjusted to be grounded or not grounded. When the moving contact of the knife switch rotates, due to inertia, it will cause vibration and impact on the insulating porcelain bottle, which may damage the structure of the insulating porcelain bottle, or even cause the insulating porcelain bottle to break and fall, posing a great safety hazard to the operators. Summary of the Utility Model
[0003] The utility model provides a structure for preventing the insulating porcelain bottle of a transformer neutral point knife switch from falling, so as to solve the safety hazard problem that when the transformer neutral point knife switch is switched on or off, the rotation of the moving contact of the knife switch may cause the insulating porcelain bottle to break and fall.
[0004] The technical solution adopted by the utility model is: a structure for preventing the insulating porcelain bottle of a transformer neutral point knife switch from falling, including a neutral point column and a grounding column installed on a base. A static contact of the knife switch is provided on the neutral point column. The grounding column includes a grounding terminal and an insulating porcelain bottle sleeved outside the grounding terminal. The grounding terminal is provided with a moving contact of the knife switch adapted to the static contact of the knife switch. The grounding column is connected to an opening and closing drive mechanism that can drive the moving contact of the knife switch to rotate to contact and disconnect from the static contact of the knife switch. At least one of the grounding terminal and the moving contact of the knife switch is connected to a protection wire. The protection wire is a wire, and the other end of the protection wire is fixedly connected to the base or the bracket for installing the base.
[0005] In order to ensure the strength of the protection wire and reduce its resistance, further: the protection wire is made of multiple strands of soft copper wire. Under general conditions, the total cross-sectional area of the protection wire is not less than 70 mm 2 .
[0006] In order to facilitate the connection of the protection wire and ensure the electrical conductivity at the joint, further: both ends of the protection wire are crimped with copper wire terminals.
[0007] To avoid corrosion of the protective wire, further: the surface of the protective wire is coated with an anti-corrosion structure. For example, the surface of the protective wire is coated with butter.
[0008] To ensure the grounding effect of the protective wire, further: the protective wire is also connected to a grounding wire, and the grounding wire is a conductor. For example, the grounding wire is the same as the protective wire.
[0009] The beneficial effects of the present utility model are as follows: when the insulating porcelain bottle breaks, the moving contact of the knife switch drops. Since at least one of the grounding terminal and the moving contact of the knife switch is connected to the protective ground wire, and the other end of the protective ground wire is fixedly connected to the base or the bracket for mounting the base, the protective ground wire can hold the grounding terminal, the moving contact of the knife switch, and the broken insulating porcelain bottle, preventing the broken insulating porcelain bottle from falling and protecting the safety of the operator. The base and the bracket for mounting the base are grounded by themselves, the protective wire is a conductor, and after the insulating porcelain bottle breaks, the grounding terminal and the moving contact of the knife switch are also grounded. BRIEF DESCRIPTION OF THE DRAWINGS
[0010] Figure 1 It is a schematic diagram of the anti-falling structure of the insulating porcelain bottle of the knife switch at the neutral point of the transformer of the present utility model.
[0011] Reference numerals: base 1, neutral point column 2, static contact of knife switch 3, insulating porcelain bottle 4, moving contact of knife switch 5, protective wire 6. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0012] The present utility model will be further described below with reference to the drawings.
[0013] As Figure 1 shown, the anti-falling structure of the insulating porcelain bottle of the knife switch at the neutral point of the transformer of the present utility model includes a neutral point column 2 and a grounding column mounted on the base 1. A static contact 3 of the knife switch is provided on the neutral point column 2. The grounding column includes a grounding terminal and an insulating porcelain bottle 4 sleeved outside the grounding terminal. The grounding terminal is provided with a moving contact 5 of the knife switch adapted to the static contact 3 of the knife switch. The grounding column is connected to an opening and closing driving mechanism that can drive the moving contact 5 of the knife switch to rotate to make it contact with and disconnect from the static contact 3 of the knife switch. Under the drive of the opening and closing driving mechanism, the moving contact 5 of the knife switch can rotate and contact with and disconnect from the static contact 3 of the knife switch, thereby adjusting the neutral point of the transformer to be grounded or not grounded accordingly.
[0014] At least one of the grounding terminal and the moving contact 5 of the knife switch is connected to the protective wire 6, and the other end of the protective wire 6 is fixedly connected to the base 1 or the bracket for mounting the base 1. The function of the protective wire 6 is to hold the grounding terminal, the moving contact 5 of the knife switch and the broken insulating porcelain bottle 4 when the insulating porcelain bottle 4 breaks, to prevent the broken insulating porcelain bottle 4 from falling, and to protect the safety of the operator. The protective wire 6 is a wire. Since the base 1 and the bracket for mounting the base 1 are grounded themselves, after the insulating porcelain bottle 4 breaks, it is ensured that the grounding terminal and the moving contact 5 of the knife switch are also grounded. In order to ensure the grounding effect of the protective wire 6, the protective wire 6 is also connected to a grounding wire, and the grounding wire is a wire. After the grounding wire is grounded, the grounding effect of the protective wire 6 can be ensured, and the grounding effect of the base 1 and the bracket for mounting the base 1 can also be guaranteed. The grounding wire is generally selected to be the same wire as the protective wire 6.
[0015] The protective wire 6 can at least withstand the impact generated by the falling of the moving contact 5 of the knife switch, and the appropriate protective wire 6 can be selected according to the weight of the moving contact 5 of the knife switch. In order to ensure the strength of the protective wire 6 and reduce its resistance, the protective wire 6 is generally made of stranded soft copper wire. Under normal conditions, the total cross-sectional area of the protective wire 6 is not less than 70 mm 2 . In order to facilitate the connection of the protective wire 6 and ensure the electrical conductivity at the joint, the two ends of the protective wire 6 are respectively crimped with copper wire terminals. After one end of the protective wire 6 is crimped with a wire terminal, it can be connected to the bolt of the base. In order to prevent the protective wire 6 from being corroded, the surface of the protective wire 6 is coated with an anti-corrosion structure. For example, the surface of the protective wire 6 is coated with butter.
Claims
1. Anti-falling structure for insulating porcelain bottle of neutral point knife switch of transformer, comprising a neutral point column (2) and a grounding column installed on a base (1), characterized in that: The neutral point post (2) is provided with a knife switch static contact (3). The grounding post includes a grounding connection post and an insulating porcelain bottle (4) sleeved outside the grounding connection post. The grounding connection post is provided with a knife switch moving contact (5) adapted to the knife switch static contact (3). The grounding post is connected to an opening and closing driving mechanism that can drive the knife switch moving contact (5) to rotate to make it contact and disconnect from the knife switch static contact (3). At least one of the grounding connection post and the knife switch moving contact (5) is connected to a protection wire (6). The protection wire (6) is a wire, and the other end of the protection wire (6) is fixedly connected to the base (1) or the bracket for installing the base (1).
2. The anti-falling structure of the insulating porcelain bottle of the transformer neutral point knife switch according to claim 1, characterized in that: The protection wire (6) is made of multiple strands of soft copper wire.
3. The anti-falling structure of the insulating porcelain bottle of the transformer neutral point knife switch according to claim 2, characterized in that: The total cross-sectional area of the protective wire (6) is not less than 70 mm 2 .
4. The anti-falling structure of the insulating porcelain bottle of the neutral knife switch of the transformer according to claim 2, characterized in that: Both ends of the protection wire (6) are crimped with copper wire nose.
5. The anti-falling structure of the insulating porcelain bottle of the transformer neutral point knife switch according to claim 1, characterized in that: The surface of the protection wire (6) is coated with an anti-corrosion structure.
6. The anti-falling structure of the insulating porcelain bottle of the transformer neutral point knife switch according to claim 5, characterized in that: The surface of the protection wire (6) is coated with butter.
7. The anti-falling structure of the insulating porcelain bottle of the transformer neutral point knife switch according to any one of claims 1 to 5, characterized in that: The protection wire (6) is also connected to a grounding wire, and the grounding wire is a wire.
8. The anti-falling structure of the insulating porcelain bottle of the transformer neutral point knife switch according to claim 7, characterized in that: The grounding wire is the same as the protection wire (6).