A GIS current transformer assembly structure
By setting a guide groove insertion structure between the guide rod and the end of the conductive rod inside the guide sleeve, and combining the contact spring and the annular iron core to sleeve the winding coil, the problem of conductive rod loosening is solved, and the connection stability and reliability of the GIS current transformer are improved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JIANGSU WO NENG HIGH VOLTAGE ELECTRIC CO LTD
- Filing Date
- 2025-07-09
- Publication Date
- 2026-06-30
AI Technical Summary
The conductive rods of existing GIS current transformers are prone to loosening due to the deterioration of the performance of the contact finger springs inside the guide sleeve, resulting in unstable connections.
The guide sleeve is equipped with a guide rod and a guide groove insertion structure at the end of the conductive rod. The winding coil is combined with a contact spring and an annular iron core and fixed by epoxy resin casting to enhance the connection stability.
This improves the stability and connection strength of the conductive rod, avoids loosening during long-term use, and ensures the reliability and safety of the current transformer.
Smart Images
Figure CN224437379U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of current transformer technology, specifically to an assembly structure for a GIS current transformer. Background Technology
[0002] Current transformers (CTs) play a crucial role in gas-insulated metal-enclosed switchgear (GIS), primarily in the following aspects: 1. Current measurement and monitoring: They proportionally convert the primary current of high-voltage lines (up to several thousand amperes) into a standard low current (e.g., 5A or 1A) for measuring instruments (such as energy meters and ammeters) to monitor the system's operating status in real time, ensuring visualized management of the power load. 2. Relay protection and control: They provide accurate current signals to relay protection devices, triggering circuit breakers to trip in case of line overload, short circuit, or other faults, quickly disconnecting the faulty circuit, ensuring the safety of power grid equipment and maintaining system stability. 3. Electrical isolation and safety protection: They isolate the high-voltage primary side from the low-voltage secondary side equipment through magnetic coupling, preventing high voltage from directly entering the measurement and protection system, ensuring the safety of operators and secondary equipment. 4. Structural integration and optimization: In GIS equipment, current transformers are typically encapsulated together with circuit breakers, disconnectors, and other components in a metal chamber filled with insulating gas. This results in a compact and highly reliable structure, suitable for dense installations in high-voltage environments.
[0003] In existing GIS current transformers, one end of the conductive rod is fastened to the transposed conductor by bolts, and the other end is inserted into the guide sleeve of another transposed conductor. With this assembly structure, after long-term use, the performance of the contact finger spring inside the guide sleeve deteriorates and deforms, which can easily cause the conductive rod to loosen. Therefore, there is an urgent need for an improved technology to solve this problem in the existing technology. Utility Model Content
[0004] The purpose of this utility model is to provide a GIS current transformer assembly structure to solve the problems mentioned in the background art.
[0005] To achieve the above objectives, this utility model provides the following technical solution: a GIS current transformer assembly structure, comprising a CT housing, a variable diameter housing, a first partition plate, a second partition plate, a shielding cylinder, a first basin-type insulator, a second basin-type insulator, a first transposed conductor, a second transposed conductor, and a conductive rod. One end of the CT housing is connected to the variable diameter housing. A first partition plate is provided at the end of the CT housing connected to the variable diameter housing. A connecting rod is provided at the end of the first partition plate away from the variable diameter housing. The end of the connecting rod away from the first partition plate is connected to the second partition plate. A plurality of shielding cylinders are provided between the first partition plate and the second partition plate. A first basin-type insulator is provided at the outer end of the variable diameter housing. The CT housing is located away from the variable diameter housing. A second basin-type insulator is provided at one end. A first transposition conductor is provided inside the first basin-type insulator via a connecting conductor. A second transposition conductor is provided inside the second basin-type insulator via a connecting conductor. The first and second transposition conductors correspond one-to-one. The first transposition conductor is fastened to one end of a conductive rod by a bolt. A guide sleeve is provided at the end of the second transposition conductor away from the second basin-type insulator. A guide rod is coaxially provided inside the guide sleeve. A guide groove is coaxially opened at the end of the conductive rod away from the first transposition conductor. The conductive rod passes through the shielding cylinder and is inserted into the guide sleeve of the corresponding second transposition conductor at the end away from the first transposition conductor. The guide rod is inserted into the guide groove at the end of the conductive rod.
[0006] Preferably, in the GIS current transformer assembly structure provided by this utility model, a contact spring is provided inside the guide sleeve, and the side wall of the end of the conductive rod is connected to the contact spring.
[0007] Preferably, the GIS current transformer assembly structure provided by this utility model includes an annular iron core sleeved on the outside of the shielding cylinder, and a winding coil sleeved on the annular iron core and fixed by epoxy resin casting.
[0008] Preferably, in the GIS current transformer assembly structure provided by this utility model, wiring covers are provided on both sides of the CT housing, and wiring terminals are provided inside the wiring covers.
[0009] Compared with the prior art, the beneficial effects of this utility model are:
[0010] The guide sleeve of the second transposition conductor is equipped with a guide rod. One end of the guide rod is provided with a guide groove. When the guide rod is inserted into the guide sleeve, the guide rod is inserted into the guide groove at the end of the guide rod, which prevents the guide rod from loosening during long-term operation and greatly improves the stability and connection strength of each guide rod. Attached Figure Description
[0011] Figure 1 This is a schematic diagram of the structure of this utility model;
[0012] Figure 2 For the appendix Figure 1 Enlarged structural diagram of point A in the middle;
[0013] Figure 3 This is a front view structural diagram of the present utility model.
[0014] In the diagram: CT housing 1, variable diameter housing 2, first partition 3, second partition 4, shielding cylinder 5, first basin insulator 6, second basin insulator 7, first transposition conductor 8, second transposition conductor 9, conductive rod 10, connecting rod 11, connecting conductor 12, guide sleeve 13, guide rod 14, guide groove 15, contact finger spring 16, annular iron core 17, wiring cover 18, wiring terminal 19. Detailed Implementation
[0015] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.
[0016] It should be noted that in the description of this utility model, the terms "inner", "outer", "upper", "lower", "both sides", "one end", "the other end", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0017] Please see Figure 1This utility model provides a technical solution: a GIS current transformer assembly structure, including a CT housing 1, a variable diameter housing 2, a first partition 3, a second partition 4, a shielding cylinder 5, a first basin-type insulator 6, a second basin-type insulator 7, a first transposed conductor 8, a second transposed conductor 9, and a conductive rod 10. One end of the CT housing 1 is connected to the variable diameter housing 2. The first partition 3 is located at the end of the CT housing 1 connected to the variable diameter housing 2. A connecting rod 11 is located at the end of the first partition 3 away from the variable diameter housing 2. The second partition 4 is connected to the end of the connecting rod 11 away from the first partition 3. Several shielding cylinders 5 are arranged between the second partition 3 and the second partition 4. A ring-shaped iron core 17 is fitted around the outside of each shielding cylinder 5. A winding coil is fitted around the ring-shaped iron core 17 and fixed by epoxy resin casting. The ring-shaped iron core 17 and the winding coil are used to proportionally convert the primary current of the high-voltage line into a standard low current. A first basin-type insulator 6 is provided at the outer end of the reducing housing 2. A second basin-type insulator 7 is provided at the end of the CT housing 1 away from the reducing housing 2. A first transposition conductor 8 is provided inside the first basin-type insulator 6 via a connecting conductor 12. A first transposition conductor 8 is provided inside the second basin-type insulator 7 via a connecting conductor 12. A second transposition conductor 9 is provided, with a one-to-one correspondence between the first transposition conductor 8 and the second transposition conductor 9. The first transposition conductor 8 is fastened to one end of the conductive rod 10 by bolts. A guide sleeve 13 is provided at the end of the second transposition conductor 9 away from the second basin-type insulator 7. A guide rod 14 is coaxially arranged inside the guide sleeve 13, with a screw at the end of the guide rod 14 for fastening to the inside of the guide sleeve 13. A guide groove 15 is coaxially formed at the end of the conductive rod 10 away from the first transposition conductor 8. The conductive rod 10 passes through the shielding cylinder 5, and the end away from the first transposition conductor 8 is connected to the corresponding second transposition conductor 9. The guide sleeve 13 is inserted, and a contact spring 16 is provided inside the guide sleeve 13. The side wall of the end of the conductive rod 10 is connected to the contact spring 16. The contact spring 16 can transmit strong current in a small space, while also ensuring the connection stability of the conductive rod 10. The guide rod 14 is inserted into the guide groove 15 at the end of the conductive rod 10. The outer end of the guide rod 14 is chamfered to facilitate smooth insertion into the guide groove 15. Wiring covers 18 are provided on both sides of the CT housing 1. Wiring terminals 19 are provided inside the wiring covers 18. The wiring terminals 19 are used to connect to the winding coil, and the outer end is connected to the monitoring instrument.
[0018] Installation method and operating principle: First, the first partition 3 is bolted to one end of the CT housing. Then, one end of the shielding cylinder 5 is bolted to the first partition 3. A ring-shaped iron core 17 is fitted outside the shielding cylinder 5, and a winding coil is fitted outside the ring-shaped iron core 17 and fixed with resin. The second partition 4 is connected to the first partition 3 through the connecting rod 11, thereby realizing the installation of each shielding cylinder 5. The winding coil is connected to the terminal block, and the terminal block is installed inside the terminal cover 18. Next, the second basin-type insulator 7 is bolted to the end of the CT housing 1 away from the first partition 3. A second transposition conductor 9 is installed inside the second basin-type insulator 7 through the connecting conductor 12. A guide rod 14 is coaxially installed inside the guide sleeve 13 of the second transposition conductor 9. The first basin-type insulator 6 is installed at one end of the reducing housing 2 via a seal and bolts. A first transposition conductor 8 is installed inside the first basin-type insulator 6 via a connecting conductor 12. A conductive rod 10 is bolted to the end of the first transposition conductor 8 away from the first basin-type insulator 6. During the connection of the reducing housing 2 and the CT housing 1, the conductive rod 10 passes through each shielding cylinder 5 and is inserted into the guide sleeve 13 of the corresponding second transposition conductor 9. Simultaneously, the guide rod 14 inside the guide sleeve 13 is inserted into the guide groove 15 at the end of the conductive rod 10, completing the installation. In use, the CT housing 1 is filled with SF6 gas. The conductive rod 10 and the SF6 gas work together as a primary coil, and the winding coil serves as a secondary coil. This converts the primary current of the high-voltage line into a standard low current for the measuring instruments to monitor the system's operating status in real time. This utility model has a reasonable structure and is easy to install. The guide sleeve 13 of the second transposition conductor 9 is provided with a guide rod 14. The conductive rod 10 and the guide sleeve 13 are fitted with a guide groove 15 at one end. When the conductive rod 10 and the guide sleeve 13 are inserted, the guide rod 14 and the guide groove 15 at the end of the conductive rod 10 are inserted, which prevents the conductive rod 10 from loosening in the long term and greatly improves the stability and connection strength of each conductive rod 10.
[0019] Any aspects of this utility model not described in detail are well-known technologies to those skilled in the art.
[0020] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although this utility model has been described in detail with reference to the embodiments, those skilled in the art should understand that modifications and equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the claims of this utility model.
Claims
1. A GIS current transformer assembly structure, characterized by: The system includes a CT housing (1), a variable diameter housing (2), a first partition (3), a second partition (4), a shielding cylinder (5), a first basin-type insulator (6), a second basin-type insulator (7), a first transposition conductor (8), a second transposition conductor (9), and a conductive rod (10). One end of the CT housing (1) is connected to the variable diameter housing (2). A first partition (3) is provided at the end of the CT housing (1) connected to the variable diameter housing (2). A connecting rod (11) is provided at the end of the first partition (3) away from the variable diameter housing (2). A second partition (4) is connected at the end of the connecting rod (11) away from the first partition (3). Several shielding cylinders (5) are provided between the first partition (3) and the second partition (4). A first basin-type insulator (6) is provided at the outer end of the variable diameter housing (2). A second basin-type insulator (7) is provided at the end of the CT housing (1) away from the variable diameter housing (2). A first transposition conductor (8) is provided on the inner side of the insulator (6) through a connecting conductor (12), and a second transposition conductor (9) is provided on the inner side of the second basin-type insulator (7) through a connecting conductor (12). The first transposition conductor (8) and the second transposition conductor (9) correspond one-to-one. The first transposition conductor (8) is fastened to one end of the conductive rod (10) by bolts. A guide sleeve (13) is provided at the end of the second transposition conductor (9) away from the second basin-type insulator (7). A guide rod (14) is coaxially provided inside the guide sleeve (13). A guide groove (15) is coaxially opened at the end of the conductive rod (10) away from the first transposition conductor (8). The conductive rod (10) passes through the shielding cylinder (5) and is inserted into the guide sleeve (13) of the corresponding second transposition conductor (9) at the end away from the first transposition conductor (8). The guide rod (14) is inserted into the guide groove (15) at the end of the conductive rod (10).
2. The GIS current transformer assembly structure according to claim 1, characterized in that: The guide sleeve (13) is provided with a finger spring (16) inside, and the side wall of the end of the conductive rod (10) is connected to the finger spring (16).
3. The GIS current transformer assembly structure of claim 1, wherein: The shielding cylinder (5) is fitted with an annular iron core (17), and the annular iron core (17) is fitted with a winding coil and fixed by epoxy resin casting.
4. The GIS current transformer assembly structure of claim 1, wherein: The CT housing (1) is provided with wiring covers (18) on both sides, and wiring terminals (19) are provided inside the wiring covers (18).