Screw-type mutual inductor high-voltage current-limiting fuse connected with alternating current and direct current
By designing a screw transformer high-voltage current limiting fuse with pass-AC and DC resistance, the pass--resistance and current limiting fuse are integrated, which solves the problem that existing distribution lines cannot perform insulation telemetry when switching to maintenance or finding faults, and achieves efficient repeat operation.
Patent Information
- Application Number
- CN202421813262.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-30
- Publication Date
- 2025-05-30
- Estimated Expiration
- 2034-07-30
AI Technical Summary
When existing distribution lines need to be transferred to maintenance tests or find faults, they cannot directly perform phase-to-phase and relative insulation telemetry, resulting in manual operation of voltage transformers, which is time-consuming and labor-intensive, and is not conducive to rapid re-energy.
A screw transformer high-voltage current limiting fuse with pass-AC and DC resistance is designed. By integrating the pass-AC and current limiting fuse, the function of the original high-voltage current limiting fuse is retained, and without changing the line operation mode, the current limiting fuse has the pass-AC and DC resistance function, which can perform phase-to-phase and relative insulation telemetry.
It realizes that without changing the original equipment size and installation method, the current limiting fuse has the function of passing, AC and DC resistance, which can save a lot of manual operation time and improve the re-energy efficiency.
Smart Images
Figure CN222927407U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of high - voltage current - limiting fuses, in particular to a screw - type transformer high - voltage current - limiting fuse that conducts alternating current and blocks direct current. Background Technique
[0002] With the advancement of the construction wave of distribution network automation, more and more three - remote switches are connected to the 10kV system in distribution network lines. The power - taking methods of automation complete sets of equipment such as three - remote distribution automation ring - main units and pole - mounted switches basically adopt traditional electromagnetic voltage transformers, and these voltage transformers usually adopt the forms of single - phase, three - phase VV connection, and three - phase five - column PT. This means that when the distribution line needs to be transferred for maintenance and testing or fails and stops operating and it is necessary to find the fault, it is impossible to directly use a megohmmeter or a DC test - sending instrument to conduct phase - to - phase and phase - to - ground tests on the distribution line. Under the current situation, when the distribution line needs to be transferred for maintenance and testing or fails and stops operating and it is necessary to find the fault, it is only possible to manually withdraw the voltage transformers of the distribution automation equipment, and it is necessary to arrange special personnel to operate all the voltage transformer switches on the line before the insulation remote measurement can be carried out, which is time - consuming and laborious and is not conducive to rapid power restoration. Content of the Utility Model
[0003] In view of the above deficiencies, the utility model provides a screw - type transformer high - voltage current - limiting fuse that conducts alternating current and blocks direct current, which can have the functions of conducting alternating current and blocking direct current and high - voltage current - limiting fuse without changing the overall size and installation method of the original screw - type high - voltage fuse.
[0004] To achieve the above - mentioned purpose, the utility model adopts the following technical scheme:
[0005] A screw - type transformer high - voltage current - limiting fuse that conducts alternating current and blocks direct current, comprising: a current - blocking resistor, one end of the current - blocking resistor is movably connected to a screw head; a current - limiting fuse, the current - limiting fuse is movably connected to the other end of the end of the current - blocking resistor connected to the screw head, forming an integral body.
[0006] Through the above - mentioned scheme, the current - blocking resistor and the current - limiting fuse form an integral body, which can not change the original overall size, thereby reducing the length of the current - limiting fuse, saving materials, being convenient for installation, and being able to retain the function of the original high - voltage current - limiting fuse. Moreover, without changing the operation mode of the line, the current - limiting fuse can have the function of conducting alternating current and blocking direct current, enabling phase - to - phase and phase - to - ground insulation remote measurement, saving a large amount of manual operations, and increasing the power restoration efficiency.
[0007] Further, the diameters of the current - blocking resistor and the current - limiting fuse are equal.
[0008] Through the above - mentioned further scheme, the current - blocking resistor and the current - limiting fuse are concentric and coaxial, which can not change the original body shape, thereby being able to adapt to the bushings and elbow heads of the voltage transformers of the current distribution automation equipment.
[0009] Further, one end of the screw head is provided with a threaded rod, and the other end is provided with a groove body. A first threaded post is provided at the bottom of the groove body, and the inner diameter of the groove body is the same as the outer diameter of the arrester.
[0010] Through the above further solution, one end of the screw head provided with the threaded rod can be adapted to the elbow head of the voltage transformer, and the other end can be connected to the arrester. The groove body can increase the connection stability between the arrester and the screw head.
[0011] Further, one end of the arrester is provided with a first threaded groove, and the other end is provided with a second threaded groove. The first threaded groove is threadedly connected to the first threaded post.
[0012] Through the above further solution, the first threaded groove at one end of the arrester is threadedly connected to the first threaded post in the groove body of the screw head, which can ensure the overall power-on performance.
[0013] Further, the connection end of the current-limiting fuse and the arrester is provided with a third threaded groove. A second threaded post is threadedly connected in the third threaded groove, and the connection end-to-end of the second threaded post and the third threaded groove is threadedly connected to the second threaded groove.
[0014] Through the above further solution, the current-limiting fuse and the arrester are connected by the second threaded post to form a whole, and the original shape and volume are not changed. The second threaded post is made of a conductive material, and the connection between the current-limiting fuse and the arrester can allow alternating current to pass through, and thus does not affect the overall conductivity.
[0015] Further, the length of the second threaded post is the sum of the depth of the third threaded groove and the depth of the second threaded groove.
[0016] Through the above further solution, when the second threaded post is threadedly connected and tightened with the second threaded groove and then threadedly connected to the third threaded groove, the second threaded post can also be screwed to the bottom of the third threaded groove, making the connection strength and stability relatively high.
[0017] Further, the current-limiting fuse and the arrester are connected by a connecting piece. The connecting piece includes a limiting piece and a third threaded post. The connection end of the current-limiting fuse and the arrester is provided with a third threaded groove. Both ends of the limiting piece are provided with protective grooves. The middle of the limiting piece is fixedly connected to the third threaded post. Both ends of the third threaded post are respectively located in the protective grooves at both ends of the limiting piece, and both ends of the third threaded post are threadedly connected to the third threaded groove and the second threaded groove respectively.
[0018] Through the above further solution, the outer diameter of the limiting member is the same as that of the screw head, avoiding excessive influence on the connection with the casing. The inner diameters of the protective grooves at both ends of the limiting member are the same as the outer diameters of the current-limiting fuse and the current-limiting resistor. When the third thread groove on the current-limiting fuse is connected to the third threaded post and the second thread groove on the current-limiting resistor is connected to the third threaded post, the current-limiting fuse and the current-limiting resistor are respectively located in the protective grooves at both ends of the limiting member, thereby increasing the connection strength and stability of the current-limiting fuse and the current-limiting resistor. The current-limiting fuse and the current-limiting resistor can conduct electricity through the third threaded post.
[0019] Further, the limiting member is made of insulating material, and the third threaded post is made of conductive material.
[0020] Through the above further solution, it can make the current-limiting fuse and the current-limiting resistor energized, and also strengthen the connection stability between the current-limiting fuse and the current-limiting resistor.
[0021] Compared with the prior art, the beneficial effects of the present utility model are as follows: The current-limiting resistor and the current-limiting fuse form an integrated body, which can not change the original overall size, thereby reducing the length of the current-limiting fuse, saving materials, being convenient for installation, and retaining the functions of the original high-voltage current-limiting fuse. Without changing the operation mode of the circuit, the current-limiting fuse has the function of passing alternating current and blocking direct current, can conduct insulation remote measurement between phases and between phase and ground, saving a large amount of manual operations, increasing the power restoration efficiency. The current-limiting resistor and the current-limiting fuse are concentric, coaxial and of the same diameter, can not change the original shape, and can be adapted to the casing and elbow head of the voltage transformer of the current distribution automation equipment. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required for description in the embodiments.
[0023] Figure 1 It is the schematic diagram of the overall structure in Embodiment 1 of the present utility model;
[0024] Figure 2 It is the schematic diagram of the screw head structure in Embodiment 1 of the present utility model;
[0025] Figure 3 It is the schematic diagram of the overall sectional structure in Embodiment 2 of the present utility model;
[0026] Figure 4 It is the schematic diagram of the overall structure in Embodiment 3 of the present utility model;
[0027] Figure 5 It is the schematic diagram of the overall sectional structure in Embodiment 3 of the present utility model.
[0028] In the figure: 1. Current limiter; 11. Screw head; 111. Threaded rod; 112. Groove body; 113. First threaded post; 12. First threaded groove; 13. Second threaded groove; 2. Current-limiting fuse; 21. Third threaded groove; 3. Second threaded post; 4. Connector; 41. Limiting part; 411. Protection groove; 42. Third threaded post. Detailed implementation mode
[0029] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.
[0030] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.
[0031] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations. In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.
[0032] Embodiment 1:
[0033] Refer to Figure 1 - Figure 2As shown, a screw-type current-limiting fuse for high-voltage mutual inductors that conducts alternating current and blocks direct current includes: a current conductor 1. One end of the current conductor 1 is movably connected to a screw head 11, and the other end is connected to the current-limiting fuse 2, thus forming an integral body. The current conductor 1 and the current-limiting fuse 2 are integrated, which can maintain the original overall size, thereby reducing the length of the current-limiting fuse 2, saving materials, facilitating installation, and retaining the functions of the original high-voltage current-limiting fuse 2. Moreover, without changing the operation mode of the circuit, the current-limiting fuse 2 can have the function of conducting alternating current and blocking direct current, enabling phase-to-phase and phase-to-ground insulation remote measurement, saving a large amount of manual operations, and increasing the power restoration efficiency.
[0034] Among them, the current conductor 1 and the current-limiting fuse 2 have the same diameter and are concentric and coaxial, which can maintain the original body shape and thus be adapted to the bushings and elbow heads of the voltage transformers of current distribution automation equipment.
[0035] Among them, one end of the screw head 11 is provided with a threaded rod 111, the other end is provided with a groove body 112, the bottom of the groove body 112 is provided with a first threaded post 113, the inner diameter of the groove body 112 is the same as the outer diameter of the current conductor 1, one end of the current conductor 1 is provided with a first threaded groove 12, and the other end is provided with a second threaded groove 13. The first threaded groove 12 is threadedly connected to the first threaded post 113. The first threaded groove 12 at one end of the current conductor 1 is threadedly connected to the first threaded post 113 in the groove body 112 of the screw head 11, which can ensure the overall power conduction performance. One end of the screw head 11 provided with the threaded rod 111 can be adapted to the elbow head inside the voltage transformer, and the first threaded post 113 at the other end can be connected to the first threaded groove 12 on the current conductor 1. The groove body 112 can increase the connection stability between the current conductor 1 and the screw head 11.
[0036] Embodiment 2:
[0037] Refer to Figure 3 As shown, on the basis of Embodiment 1, a third threaded groove 21 is provided at the connection end of the current-limiting fuse 2 and the current conductor 1. A second threaded post 3 is threadedly connected in the third threaded groove 21. The connection end of the second threaded post 3 and the third threaded groove 21 is threadedly connected to the second threaded groove 13 end-to-end. The current-limiting fuse 2 and the current conductor 1 are connected by the second threaded post 3 to form an integral body without changing the original shape and volume.
[0038] Among them, the second threaded post 3 is made of a conductive material. The connection between the current-limiting fuse 2 and the current conductor 1 can allow alternating current to pass through, thus not affecting the overall conductivity.
[0039] Wherein, the length of the second threaded post 3 is the sum of the depth of the third threaded groove 21 and the depth of the second threaded groove 13. When the second threaded post 3 is screwed and tightened with the second threaded groove 13 and then screwed with the third threaded groove 21, the second threaded post 3 can also be screwed to the bottom of the third threaded groove 21, making the connection strong and stable.
[0040] Embodiment 3:
[0041] Referring to Figure 4 - Figure 5 As shown, on the basis of Embodiment 1, the current-limiting fuse 2 and the current-limiting resistor 1 are connected through a connecting member 4. The connecting member 4 includes a limiting member 41 and a third threaded post 42. A third threaded groove 21 is provided at the connection end of the current-limiting fuse 2 and the current-limiting resistor 1. Both ends of the limiting member 41 are provided with protective grooves 411. The middle of the limiting member 41 is fixedly connected to the third threaded post 42. Both ends of the third threaded post 42 are respectively located in the protective grooves 411 at both ends of the limiting member 41. Both ends of the third threaded post 42 are respectively threadedly connected to the third threaded groove 21 and the second threaded groove 13. The outer diameter of the limiting member 41 is the same as the outer diameter of the screw head 11, so as not to overly affect the connection with the sleeve. The inner diameters of the protective grooves 411 at both ends of the limiting member 41 are the same as the outer diameters of the current-limiting fuse 2 and the current-limiting resistor 1. When the third threaded groove 21 on the current-limiting fuse 2 is connected to the third threaded post 42 and the second threaded groove 13 on the current-limiting resistor 1 is connected to the third threaded post 42, the current-limiting fuse 2 and the current-limiting resistor 1 are respectively located in the protective grooves 411 at both ends of the limiting member 41, thereby increasing the connection strength and stability between the current-limiting fuse 2 and the current-limiting resistor 1. The current-limiting fuse 2 and the current-limiting resistor 1 can conduct electricity through the third threaded post 42.
[0042] Wherein, the limiting member 41 is made of insulating material, and the third threaded post 42 is made of conductive material, which can not only make the current-limiting fuse 2 and the current-limiting resistor 1 conduct electricity, but also enhance the connection stability between the current-limiting fuse 2 and the current-limiting resistor 1.
[0043] It should be noted that the first threaded groove 12, the second threaded groove 13, and the third threaded groove 21 are all electrical connection points.
[0044] As a further elaboration of the present invention, when the distribution line needs to be transferred for maintenance tests or a fault occurs and the line needs to be shut down for fault finding, it is necessary to perform phase-to-phase and phase-to-ground insulation remote measurement on the line. Due to the existence of the voltage transformer, it is impossible to directly perform phase-to-phase and phase-to-ground insulation remote measurement with the PT. Using the present invention, the phase-to-phase and phase-to-ground insulation remote measurement of the distribution line can be directly carried out with the PT, without the need to operate and disconnect the high-voltage switch of the voltage transformer, saving 60 minutes per operation; currently, there are usually 3 or more automation devices in the effectively covered lines of distribution automation. Based on this estimate, more than 3 hours of manual operation time can be saved.
[0045] As a further elaboration of the present utility model, the current-limiting fuse and the screw head are prior arts, and their internal structures will not be explained in detail.
[0046] The above are only specific embodiments of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present utility model should be covered within the protection scope of the present utility model. Therefore, the protection scope of the present utility model shall be subject to the protection scope of the claims.
Claims
1. A screw-type transformer high-voltage current-limiting fuse capable of passing AC and blocking DC, characterized in that: include: A flow resistor (1), one end of the flow resistor (1) being movably connected to a screw head (11); A current limiting fuse (2) is movably connected to the other end of the resistor (1) connected to one end of the screw head (11), forming an integral body.
2. The screw-type transformer high-voltage current-limiting fuse capable of passing AC and blocking DC according to claim 1, characterized in that: The through resistor (1) and the current limiting fuse (2) have the same diameter.
3. The screw-type transformer high-voltage current-limiting fuse capable of passing AC and blocking DC according to claim 1, characterized in that: A threaded rod (111) is provided at one end of the screw head (11), and a groove body (112) is provided at the other end. A first threaded column (113) is provided at the bottom of the groove body (112). The inner diameter of the groove body (112) is the same as the outer diameter of the resistor (1).
4. The screw-type transformer high-voltage current-limiting fuse capable of passing AC and blocking DC according to claim 3 is characterized in that: The resistor (1) is provided with a first thread groove (12) at one end and a second thread groove (13) at the other end, and the first thread groove (12) is threadedly connected to a first thread column (113).
5. The screw-type transformer high-voltage current-limiting fuse capable of passing AC and blocking DC according to claim 4, characterized in that: The connecting end of the current limiting fuse (2) and the resistor (1) is provided with a third thread groove (21), the third thread groove (21) is internally threadedly connected with a second thread column (3), and the connecting end of the second thread column (3) and the third thread groove (21) is threadedly connected to the second thread groove (13) end to end.
6. The screw-type transformer high-voltage current-limiting fuse capable of passing AC and blocking DC according to claim 5, characterized in that: The length of the second thread column (3) is the sum of the depth of the third thread groove (21) and the depth of the second thread groove (13).
7. The screw-type transformer high-voltage current-limiting fuse capable of passing AC and blocking DC according to claim 4, characterized in that: The current limiting fuse (2) and the resistor (1) are connected via a connecting piece (4); the connecting piece (4) comprises a stopper (41) and a third threaded column (42); a third threaded groove (21) is provided at the connection end between the current limiting fuse (2) and the resistor (1); both ends of the stopper (41) are provided with protective grooves (411); the middle of the stopper (41) is fixedly connected to the third threaded column (42); both ends of the third threaded column (42) are respectively located in the protective grooves (411) at both ends of the stopper (41); and both ends of the third threaded column (42) are respectively threadedly connected to the third threaded groove (21) and the second threaded groove (13).
8. The screw-type transformer high-voltage current-limiting fuse capable of passing AC and blocking DC according to claim 7, characterized in that: The limiting member (41) is made of insulating material, and the third threaded column (42) is made of conductive material.