High voltage current transformer with transport auxiliary support

Abstract

The utility model relates to a kind of high-voltage current transformer with transportation auxiliary support, multiple groups of iron core coils are equipped in high-voltage shell, multiple groups of iron core coils are installed in coil shielding sleeve, and the upper end of coil shielding cylinder is connected with limiting flange;High-voltage shell upper end opening is fixedly connected with flange seat, and flange seat is screw locked, sealed by sealing ring and supported sealing flange, and sealing flange is screw locked, supported by sealing ring and flange cover plate, the inner cavity of sealing flange encapsulated by flange cover plate is provided with auxiliary support, and auxiliary support includes coaxial lower support shaft part and upper support flange part, lower support shaft part is sealingly guided and connected in the inner hole of flange seat, the upper end surface of upper support flange part is provided with adjusting screw hole, adjusting bolt is threaded through flange cover plate, and adjusting bolt is screwed with adjusting screw hole.It is simple and compact in structure, can satisfy the stable support to coil structure under the state of transportation and laying down, and improve structural safety performance.

Description

Technical Field

[0001] This utility model relates to a current transformer, specifically a high-voltage current transformer with transport auxiliary support. Background Technology

[0002] Existing conventional high-voltage current transformers use basin-type insulators or post insulators to support the secondary coils and coil shielding cylinders. These basin-type or post insulators are a significant contributor to product failures, primarily due to two reasons: firstly, poor manufacturing quality of the basin-type or post insulators; secondly, the height of high-voltage products necessitates transporting them on their side. During this process, the weight of all components, including the secondary coils and coil shielding cylinders, is concentrated on one end of the basin-type or post insulator, which acts as a cantilever beam. The impact forces from bumps and vibrations during transport further increase the risk of breakage due to the cantilever structure. Furthermore, once the current transformer arrives at the substation, it is impossible to disassemble and inspect the basin-type or post insulators for damage during on-site acceptance testing. In severe cases, the basin-type or post insulators may break, crack, or develop microscopic cracks, leading to insulation failure during operation. If a current transformer fails, it can cause damage to the equipment itself or even lead to a power safety accident, seriously affecting the stability of the power system and the reliability of power supply. Therefore, ensuring the reliability of current transformers is crucial for the safe and stable operation of the power grid system. Summary of the Invention

[0003] This invention provides a high-voltage current transformer with a simple and compact structure that can provide stable support for the coil structure in the transport-layout state and improve the structural safety performance.

[0004] The technical solution adopted in this utility model is as follows: a high-voltage current transformer with transport auxiliary support, comprising a high-voltage housing, an explosion-proof glass filament tube, and a base. Multiple sets of iron core coils are installed inside the high-voltage housing, and the iron core coils are connected to conductive rods. Both ends of the conductive rods extend out of the high-voltage housing and are connected to conductive busbars. The iron core coils are led out through the explosion-proof glass filament tube and connected to a junction box on the base. The key feature is that the multiple sets of iron core coils are housed within a coil shielding sleeve, which is centrally mounted on the conductive rod. The lower end of the coil shielding sleeve is supported by a lead wire shielding support tube inside the explosion-proof glass filament tube. On the seat, the upper end of the coil shielding cylinder is connected to a limit flange; the upper opening of the high-voltage housing is fixedly connected to a flange seat, the flange seat is tightened with screws and a sealing ring is used to seal and support the sealing flange, the sealing flange is tightened with screws and a sealing ring is used to support the flange cover plate, the inner cavity of the sealing flange encapsulated by the flange cover plate is provided with an auxiliary support component, the auxiliary support component includes a coaxially connected lower support shaft and an upper support flange, the lower support shaft is sealed and guided through the inner hole of the flange seat, the upper end face of the upper support flange is provided with an adjustment screw hole, the flange cover plate is threaded with an adjustment bolt, and the adjustment bolt is screwed into the adjustment screw hole.

[0005] One or more sealing rings are provided on the upper end face of the upper support flange and / or the lower end face of the flange cover plate, around the adjusting bolt.

[0006] The inner ring of the limiting flange is provided with a polytetrafluoroethylene retaining ring corresponding to the lower support shaft.

[0007] The sealing ring is an EPDM sealing ring.

[0008] The outer wall of the high-pressure housing is connected to an explosion-proof plate that communicates with the inner cavity.

[0009] The lower end of the high-pressure housing is connected to an explosion-proof glass fiber tube.

[0010] The explosion-proof glass fiber spool is fitted with a silicone rubber sleeve, and a high-voltage shielding cover is installed inside the lead wire shielding support tube.

[0011] The lower end of the lead wire shielding support tube is locked and supported on the base by a reinforcing flange.

[0012] The high-pressure shell and the explosion-proof glass fiber tube are filled with insulating gas.

[0013] The insulating gas is a mixture of SF6 and N2.

[0014] This invention employs a composite insulation structure, combining a silicone rubber sleeve with an explosion-proof glass fiber tube. Even if internal faults such as electric arcing occur, the explosion-proof glass fiber tube will not rupture, protecting the silicone rubber sleeve intact. The transformer is filled with a pressurized SF6 + N2 mixed gas, reducing the impact of greenhouse gas leakage and emissions on the atmospheric environment. The transformer eliminates the need for basin-type or post-type insulators, thus eliminating the need for support for the coil shielding cylinder and preventing product failures due to insulator quality issues. Furthermore, the gas chamber space between the transformer's high-voltage casing and the silicone rubber sleeve is completely open due to the absence of insulators, allowing the explosion-proof disc to quickly sense internal pressure changes. When the burst pressure is reached, the disc can burst rapidly, preventing further escalation of the fault. The transformer is equipped with a transport auxiliary support rod on top. By adjusting the bolts, the transport auxiliary component is pushed into the limiting flange, which reduces the probability of the lead wire shielding support tube breaking due to excessive weight of the head coil shielding tube during the transport of the transformer. After the transformer arrives at the site, the transport auxiliary support rod can be lifted by rotating the adjusting bolts. The transformer does not need to be damaged, which effectively ensures the structural safety and life of the transformer. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 for Figure 1 Enlarged view of the structure of the upper transport auxiliary component of the medium and high voltage housing being inserted into the shielding sleeve of the limit coil; Figure 3 for Figure 1 Enlarged view of the structure of the upper transport auxiliary component of the medium and high voltage housing detaching from the shielding sleeve of the limiting coil.

[0016] In the diagram: 1. High-voltage housing; 2. Explosion-proof sheet; 3. Conductive rod; 4. Conductive busbar; 5. Iron core coil; 6. Coil shielding cylinder; 7. Explosion-proof glass fiber cylinder; 8. Silicone rubber sleeve; 9. High-voltage shielding cover; 10. Lead wire shielding support tube; 11. Reinforcing flange; 12. Base; 13. Junction box; 14. Limiting flange; 15. PTFE retaining ring; 16. Auxiliary support component; 161. Lower support shaft; 162. Upper support flange; 17. Flange seat; 18. Support sealing flange; 19. Flange cover plate; 20. Adjusting screw hole; 21. Adjusting bolt; 22. EPDM sealing ring. Detailed Implementation

[0017] The following explanation, in conjunction with the accompanying drawings, will provide further details.

[0018] Figure 1-3As shown: A high-voltage current transformer with transport auxiliary support includes a high-voltage housing 1, an explosion-proof sheet 2, a conductive rod 3, a conductive busbar 4, an iron core coil 5, a coil shielding cylinder 6, an explosion-proof glass fiber cylinder 7, a silicone rubber sleeve 8, a high-voltage shielding cover 9, a lead wire shielding support tube 10, a reinforcing flange 11, a base 12, a junction box 13, a limiting flange 14, a polytetrafluoroethylene retaining ring 15, an auxiliary support component 16, a flange seat 17, a support sealing flange 18, a flange cover plate 19, an adjusting bolt 21, and an EPDM sealing ring 22.

[0019] Multiple sets of iron core coils 5 are installed inside the high-voltage housing 1. The iron core coils 5 are connected to the conductive rods 3. The two ends of the conductive rods 3 extend out of the high-voltage housing 1 and are connected to the conductive busbars 4. Explosion-proof plates 2 are installed on the side of the high-voltage housing 1. The lower end of the high-voltage housing 1 is connected to an explosion-proof glass fiber tube 6 via a flange. The lower end of the explosion-proof glass fiber tube 6 is connected to a base 12 via a flange. A junction box 13 is installed on the side of the base 12. The explosion-proof glass fiber tube 6 is covered with a silicone rubber sleeve 8. The iron core coils 5 are led out, pass through the explosion-proof glass fiber tube 7, and connect to the junction box 13 via the base 12. Multiple sets of iron core coils 5 are installed inside the coil shielding sleeve 6. The coil shielding sleeve 6 is centrally mounted on the conductive rods 3. The lower end of the coil shielding sleeve 6 is connected to a lead wire shielding support tube 10 via a flange. The lead wire shielding support tube passes through the explosion-proof glass fiber tube and is locked to the base via a reinforcing flange 11. On the upper part of the lead wire shielding support tube 10, a high-voltage shielding cover 9 is fitted over the upper part of the explosion-proof glass fiber tube 7. The upper end of the coil shielding tube 6 is connected to a limiting flange 14. The upper opening of the high-voltage housing 1 is fixedly connected to a flange seat 17. The flange seat 17 is screwed and sealed with a sealing ring to support the sealing flange 18. The sealing flange 18 is screwed and sealed with a sealing ring to support the flange cover plate 19. The inner cavity of the supporting sealing flange enclosed by the flange cover plate 19 is provided with an auxiliary support component 16. The auxiliary support component 16 includes a coaxially connected lower support shaft part 161 and an upper support flange part 162. The lower support shaft part 161 is sealed and guided through the inner hole of the flange seat 17. The upper end face of the upper support flange part 162 is provided with an adjusting screw hole 20. The flange cover plate 19 is threaded with an adjusting bolt 21, which is screwed into the adjusting screw hole 20. The inner ring of the limiting flange 14 is provided with a polytetrafluoroethylene retaining ring 15 corresponding to the lower support shaft part 161.

[0020] In this embodiment, one or more EPDM sealing rings 22 are provided on the upper end face of the upper support flange and / or the lower end face of the flange cover plate, around the adjusting bolt.

[0021] In this embodiment, the high-voltage casing and the explosion-proof glass fiber tube are filled with insulating gas. The insulating gas is preferably a mixture of SF6 and N2.

[0022] In this embodiment, Figure 3 After the operation steps, the adjusting bolt can be removed and replaced with a bolt or screw of the same specification but shorter in length to replace the locking connection.

Claims

1. A high-voltage current transformer with transport auxiliary support, comprising a high-voltage housing, an explosion-proof glass filament tube, and a base, wherein multiple sets of iron core coils are disposed inside the high-voltage housing, the iron core coils are connected to conductive rods, the two ends of the conductive rods extend out of the high-voltage housing and are connected to conductive bars, and the iron core coils are connected to a junction box on the base via leads passing through the explosion-proof glass filament tube, the base, and the transformer itself. The transformer is characterized in that: The multiple sets of iron core coils are installed inside the coil shielding sleeve. The coil shielding cylinder is centrally mounted on the conductive rod. The lower end of the coil shielding cylinder is supported on the base via an explosion-proof glass fiber tube inner lead wire shielding support tube. The upper end of the coil shielding cylinder is connected to a limit flange. The upper opening of the high-voltage housing is fixedly connected to a flange seat. The flange seat is screwed and sealed with a sealing ring to support the sealing flange. The sealing flange is screwed and sealed with a sealing ring to support the flange cover plate. The inner cavity of the sealing flange enclosed by the flange cover plate is provided with an auxiliary support component. The auxiliary support component includes a coaxially connected lower support shaft and an upper support flange. The lower support shaft is sealed and guided through the inner hole of the flange seat. The upper end face of the upper support flange is provided with an adjustment screw hole. An adjustment bolt is threaded through the flange cover plate and screwed into the adjustment screw hole.

2. A high-voltage current transformer with transport auxiliary support according to claim 1, characterized in that: One or more sealing rings are provided on the upper end face of the upper support flange and / or the lower end face of the flange cover plate, around the adjusting bolt.

3. A high-voltage current transformer with transport auxiliary support according to claim 1, characterized in that: The inner ring of the limiting flange is provided with a polytetrafluoroethylene retaining ring corresponding to the lower support shaft.

4. A high-voltage current transformer with transport auxiliary support according to claim 1 or 2, characterized in that: The sealing ring is an EPDM sealing ring.

5. A high-voltage current transformer with transport auxiliary support according to claim 1, characterized in that: The outer wall of the high-pressure housing is connected to an explosion-proof plate that communicates with the inner cavity.

6. A high-voltage current transformer with transport auxiliary support according to claim 1 or 5, characterized in that: The lower end of the high-pressure housing is connected to an explosion-proof glass fiber tube.

7. A high-voltage current transformer with transport auxiliary support according to claim 1, characterized in that: The explosion-proof glass fiber spool is fitted with a silicone rubber sleeve, and a high-voltage shielding cover is installed inside the lead wire shielding support tube.

8. A high-voltage current transformer with transport auxiliary support according to claim 1, characterized in that: The lower end of the lead wire shielding support tube is locked and supported on the base by a reinforcing flange.

9. A high-voltage current transformer with transport auxiliary support according to claim 6, characterized in that: The high-pressure shell and the explosion-proof glass fiber tube are filled with insulating gas.

10. A high-voltage current transformer with transport auxiliary support according to claim 9, characterized in that: The insulating gas is a mixture of SF6 and N2.

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