Carrier protection sphere gap structure of N end of CVT capacitive voltage divider
By designing a carrier protection ball gap structure at the N-terminal of the CVT capacitor voltage divider, the gap between the carrier insulator and the ball head is used to limit the ground potential of the N-terminal terminal of the capacitor voltage divider, the safety hazards existing in the N-terminal grounding design in the prior art are solved, and the safety reliability of equipment operation and flexible adaptation to different power system requirements are achieved.
Patent Information
- Application Number
- CN202421240628.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-31
- Publication Date
- 2025-05-02
- Estimated Expiration
- 2034-05-31
AI Technical Summary
The N-terminal grounding design of the existing CVT capacitor voltage divider poses safety risks, which may lead to unsolid grounding or unsuspended grounding, increasing the safety risks during equipment operation.
A carrier protection ball gap structure is designed, by setting a carrier protection ball gap at the N-terminal of the CVT capacitor voltage divider, the gap is increased by the coordination between the carrier insulator and the ball head, so that the potential to ground of the capacitance voltage divider is limited to very low, thereby preventing product overvoltage.
It effectively prevents product overvoltage, protects the operation safety of the equipment, ensures that the rear-mounted carrier equipment is protected from overvoltage hazards, and meets the protection needs of different power systems through adjustable gap design.
Smart Images
Figure CN222826812U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of power equipment design and manufacturing, in particular to a carrier protection ball gap structure at the N end of a CVT capacitor voltage divider. Background Art
[0002] In the existing capacitive voltage transformer (CVT) products, the N-end of the end screen of the CVT capacitor divider is first transferred through an epoxy-cast terminal board and then connected to the secondary terminal box, and then the N-end is installed on the grounding plate in the secondary terminal box, and finally directly grounded through the secondary terminal box shell.
[0003] Usually, the connection between the N-terminal of the end screen of the CVT capacitor divider and the ground is designed to be detachable, in order to facilitate on-site detection of capacitance and dielectric loss. However, this detachable connection method also brings potential safety hazards, because when the power systems in various places organize tests and wiring work, they may fail to conduct work handover in time due to poor coordination between departments, resulting in the N-terminal grounding being unstable or even suspended when the product is officially running, which greatly increases the safety risks in the operation of CVT products, and may further cause equipment damage, which is not conducive to the long-term safe operation of the product. Summary of the invention
[0004] To this end, the utility model provides a carrier protection ball gap structure at the N end of a CVT capacitor divider. By setting a carrier protection ball gap at the N end of the CVT capacitor divider, the grounding installation method of the N end is changed. By adding a protection ball gap device, the product is safe and reliable during operation.
[0005] In order to solve the above technical problems, the utility model provides a carrier protection ball gap structure at the N end of a CVT capacitive voltage divider, comprising:
[0006] A secondary terminal board, the terminal head of which is connected to the N terminal of the CVT capacitor voltage divider;
[0007] A secondary terminal box is provided with a carrier insulator, wherein the carrier insulator comprises a first end and a second end arranged opposite to each other, the pile head is connected to the first end of the carrier insulator through a wire, and the second end of the carrier insulator is connected to a carrier device;
[0008] The protective ball gap device comprises a first discharge ball head and a second discharge ball head; wherein the first discharge ball head is installed on the carrier insulator and close to the first end thereof, the second discharge ball head is grounded, and a gap is formed between the first discharge ball head and the second discharge ball head.
[0009] In one implementation manner of the utility model, the gap between the first discharge ball head and the second discharge ball head is adjustable.
[0010] In one embodiment of the utility model, the protective ball gap device also includes a protective ball gap connecting plate installed on the carrier insulator, the protective ball gap connecting plate is provided with an adjustment groove, the first discharge ball head extends with a first connecting column, and the first connecting column is connected to the adjustment groove through a first locking nut.
[0011] In an implementation manner of the utility model, the protective spherical gap connecting plate extends perpendicularly to the axis of the carrier insulator, and the first connecting column is perpendicular to the surface of the protective spherical gap connecting plate.
[0012] In one embodiment of the utility model, the protective ball gap device also includes a base installed on the wall of the secondary terminal box, the second discharge ball head extends with a second connecting column threadedly connected to the base, and the second connecting column is threadedly connected with a second locking nut.
[0013] In an embodiment of the present invention, the first connecting column and the second connecting column are arranged in parallel.
[0014] In one implementation manner of the present utility model, a line connecting the centers of the first discharge ball head and the second discharge ball head is perpendicular to the axis of the carrier insulator.
[0015] In one implementation of the utility model, the carrier insulator is of epoxy integral casting type.
[0016] In one implementation manner of the present invention, the first discharge ball head and the second discharge ball head are both made of copper.
[0017] In one implementation manner of the utility model, the surfaces of the first discharge ball head and the second discharge ball head are smooth.
[0018] The above technical solution of the utility model has the following advantages compared with the prior art:
[0019] The utility model discloses a carrier protection ball gap structure at the N-end of a CVT capacitor divider. By setting a carrier protection ball gap at the N-end of the CVT capacitor divider and increasing the gap by matching the distance between a carrier insulator and a ball head, the ground potential of the N-end of the capacitor divider is limited to a very low level, thereby preventing product overvoltage, protecting the safe operation of the equipment, and ensuring that the subsequent carrier equipment is free from overvoltage hazards.
[0020] The gap between the ball gaps of the utility model is adjustable to meet the requirements of different power systems for equipment protection. By adjusting the gap between the ball heads, the protection sensitivity of the system can be flexibly adjusted to adapt to the operating requirements of different capacitive voltage dividers.
[0021] The utility model has the advantages of simple structure, low cost and easy maintenance. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] In order to make the content of the utility model more clearly understood, the utility model is further described in detail below based on specific embodiments of the utility model in combination with the accompanying drawings.
[0023] Figure 1 It is a schematic diagram of one side of the carrier protection ball gap structure at the N end of the CVT capacitor voltage divider of the utility model.
[0024] Figure 2 yes Figure 1 A partial enlarged schematic diagram of .
[0025] Figure 3 It is a schematic diagram of the other side of the carrier protection ball gap structure at the N end of the CVT capacitive voltage divider of the utility model.
[0026] Description of the Figures in the Specification:
[0027] 1. Secondary terminal board;
[0028] 2. N terminal of CVT capacitor voltage divider;
[0029] 3. Secondary terminal box;
[0030] 4. Carrier insulator; 41. Pressure plate; 42. Sealing ring;
[0031] 5. Protective ball gap device; 51a. First discharge ball head; 52a. First connecting column; 51b. Second discharge ball head; 52b. Second connecting column; 53. Protective ball gap connecting plate; 54. First locking nut; 55. Second locking nut; 56. Base;
[0032] 6. Second discharge ball head;
[0033] 7. Protect the ball gap connecting plate. DETAILED DESCRIPTION
[0034] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.
[0035] In the present invention, if directions (up, down, left, right, front and back) are described, it is only for the convenience of describing the technical solution of the present invention, and does not indicate or imply that the technical features referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.
[0036] In the present utility model, "several" means one or more, "multiple" means more than two, "greater than", "less than", "exceed" and the like are understood to exclude the number itself; "above", "below", "within" and the like are understood to include the number itself. In the description of the present utility model, if there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.
[0037] In the present invention, unless otherwise clearly defined, the words "set", "install", "connect" and the like should be understood in a broad sense, for example, they can be directly connected or indirectly connected through an intermediate medium; they can be fixedly connected or detachably connected or integrally formed; they can be mechanically connected or electrically connected or able to communicate with each other; they can be the internal connection of two elements or the interaction relationship between two elements. Those skilled in the art can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution.
[0038] Reference Figures 1 to 3 As shown, the utility model is a carrier protection ball gap structure at the N end of a CVT capacitor voltage divider, comprising:
[0039] A secondary terminal board 1, the terminal head of the secondary terminal board 1 is connected to the N terminal 2 of the CVT capacitor voltage divider;
[0040] A secondary terminal box 3 is provided with a carrier insulator 4, wherein the carrier insulator 4 comprises a first end and a second end which are arranged opposite to each other, the pile head is connected to the first end of the carrier insulator 4 through a wire, and the second end of the carrier insulator 4 is connected to a carrier device;
[0041] The protective ball gap device 5 includes a first discharge ball head 51a and a second discharge ball head 6; wherein the first discharge ball head 51a is installed on the carrier insulator 4 and close to its first end, the second discharge ball head 6 is grounded (through a grounding device), and a gap is formed between the first discharge ball head 51a and the second discharge ball head 6.
[0042] Through the above, when the capacitor voltage divider generates abnormal overvoltage, the current is guided into the ground through the gap breakdown in advance, protecting the capacitor voltage divider, the compensation reactor and the intermediate transformer from overvoltage damage, thereby ensuring the safe operation of the entire system.
[0043] By setting a carrier protection ball gap at the N end 2 of the CVT capacitor divider and increasing the gap by using the distance between the carrier insulator 4 and the ball head, the ground potential of the N end of the capacitor divider is limited to a very low level, thereby preventing product overvoltage, protecting the safe operation of the equipment, and ensuring that the subsequent carrier equipment is free from overvoltage hazards.
[0044] In one embodiment, the gap between the first discharge ball head 51a and the second discharge ball head 6 is adjustable. By adjusting the gap distance, different requirements can be met to ensure the safety of the device.
[0045] Specifically, the protective ball gap device 5 also includes a protective ball gap connecting plate 7 installed on the carrier insulator 4, the protective ball gap connecting plate 7 is provided with an adjustment groove, the first discharge ball head 51a extends with a first connecting column 52a, and the first connecting column 52a is connected to the adjustment groove through a first locking nut 54.
[0046] The protective spherical gap connecting plate 7 extends perpendicularly to the axis of the carrier insulator 4 , and the first connecting column 52 a is perpendicular to the surface of the protective spherical gap connecting plate 7 .
[0047] The protective ball gap device 5 also includes a base 56 installed on the wall of the secondary terminal box 3 . The second discharge ball head 6 extends with a second connecting column 52 b threadedly connected to the base 56 . The second connecting column 52 b is threadedly connected to a second locking nut 55 .
[0048] The first connecting pillar 52a and the second connecting pillar 52b are arranged in parallel.
[0049] The line connecting the centers of the first discharge ball head 51 a and the second discharge ball head 6 is perpendicular to the axis of the carrier insulator 4 .
[0050] In one embodiment, the carrier insulator 4 is an epoxy integral casting type, and the carrier insulator 4 is installed on the wall of the secondary terminal box 3 through a pressure plate 41, a sealing ring 42, and a bolt assembly. The epoxy integral casting type carrier insulator 4 has a high voltage resistance level and is moisture-proof. The carrier insulator 4 has the function of supporting the live wire to connect the carrier communication.
[0051] In one embodiment, the first discharge ball head 51a and the second discharge ball head 6 are made of copper; the first discharge ball head 51a and the second discharge ball head 6 have smooth surfaces. The copper ball head has a smooth and clean head, which makes the conductive performance more reliable.
[0052] The principle of the utility model: when the capacitor voltage divider generates abnormal overvoltage, the gap breakdown is first performed, and the current is introduced into the earth through grounding to protect the capacitor voltage divider, the intermediate transformer and the compensation reactor from being damaged by overvoltage. When the N end of the capacitor voltage divider is connected to the high voltage end of the carrier device, the potential of point N ensures that the carrier device is always at a low potential. Even if there is a fault inside the carrier device, the subsequent carrier device can be protected from overvoltage hazards, ensuring the safety of equipment and personnel.
[0053] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to examples, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit 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 carrier protection spherical gap structure at the N end of a CVT capacitive voltage divider, characterized in that: include: A secondary terminal board (1), wherein a terminal end of the secondary terminal board (1) is connected to an N terminal (2) of a CVT capacitor voltage divider; A secondary terminal box (3) is installed with a carrier insulator (4), the carrier insulator (4) comprising a first end and a second end arranged opposite to each other, the pile head is connected to the first end of the carrier insulator (4) via a wire, and the second end of the carrier insulator (4) is connected to a carrier device; The protective ball gap device (5) comprises a first discharge ball head (51a) and a second discharge ball head (6); wherein the first discharge ball head (51a) is installed on the carrier insulator (4) and is close to the first end thereof, the second discharge ball head (6) is grounded, and a gap is formed between the first discharge ball head (51a) and the second discharge ball head (6).
2. The carrier protection spherical gap structure at the N-terminal of a CVT capacitive voltage divider according to claim 1, characterized in that: The gap between the first discharge ball head (51a) and the second discharge ball head (6) is adjustable.
3. The carrier protection spherical gap structure at the N-terminal of a CVT capacitive voltage divider according to claim 1 or 2, characterized in that: The protective ball gap device (5) further comprises a protective ball gap connecting plate (7) mounted on the carrier insulator (4), the protective ball gap connecting plate (7) being provided with an adjustment slot, the first discharge ball head (51a) being extended with a first connecting column (52a), the first connecting column (52a) being connected to the adjustment slot via a first locking nut (54).
4. The carrier protection spherical gap structure at the N-terminal of a CVT capacitive voltage divider according to claim 3, characterized in that: The protective spherical gap connecting plate (7) extends perpendicularly to the axis of the carrier insulator (4), and the first connecting column (52a) is perpendicular to the surface of the protective spherical gap connecting plate (7).
5. The carrier protection spherical gap structure at the N-terminal of a CVT capacitive voltage divider according to claim 3, characterized in that: The protective ball gap device (5) further comprises a base (56) mounted on the wall of the secondary terminal box (3); the second discharge ball head (6) extends with a second connecting column (52b) threadedly connected to the base (56); the second connecting column (52b) is threadedly connected to a second locking nut (55).
6. The carrier protection spherical gap structure at the N-terminal of a CVT capacitive voltage divider according to claim 5, characterized in that: The first connecting column (52a) and the second connecting column (52b) are arranged in parallel.
7. The carrier protection spherical gap structure at the N-terminal of a CVT capacitive voltage divider according to claim 3, characterized in that: The line connecting the centers of the first discharge ball head (51a) and the second discharge ball head (6) is perpendicular to the axis of the carrier insulator (4).
8. The carrier protection spherical gap structure at the N-terminal of a CVT capacitive voltage divider according to claim 1, characterized in that: The carrier insulator (4) is of epoxy integral casting type.
9. The carrier protection spherical gap structure at the N-terminal of a CVT capacitive voltage divider according to claim 1, characterized in that: The first discharge ball head (51a) and the second discharge ball head (6) are both made of copper.
10. The carrier protection spherical gap structure at the N-terminal of a CVT capacitive voltage divider according to claim 1, characterized in that: The first discharge ball head (51a) and the second discharge ball head (6) have smooth surfaces.