A novel installation structure for the primary lead wire of a current transformer

Abstract

The present invention relates to the technical field of generator manufacturing, and particularly to a novel installation structure for a primary lead of a current transformer, which includes a cooling device and a wire clamping device. The cooling device contains a cooling box, and a curved round steel is provided inside the cooling box, aiming to increase the creepage distance. The cooling box is used to fill an insulating medium, on the one hand, to prevent conduction between the round steels through the medium, and on the other hand, to reduce the temperature so that the device can operate stably at an ideal temperature for a long time. Nuts are provided on both sides of the epoxy glass cloth tube of the wire clamping device, and a stop washer is also provided on one side of the front end, which can effectively prevent the vibration generated during the operation of the unit from forcing the wire clamping device to loosen. Therefore, the present invention has the advantages of constant temperature, simple appearance, light self-weight, long creepage distance, and reduced loosening of the wire clamp.

Description

Technical Field

[0001] The present invention belongs to the technical field of generator manufacturing, and particularly relates to a novel installation structure for the primary lead of a current transformer. Background Art

[0002] As is known, neutral point current transformers are used for measurement and protection during the operation of generators. The number of secondary windings depends on the requirements of measuring instruments, protection devices, and automation components. Measuring instruments and protection devices should be connected to different secondary windings respectively. Most users require the manufacturer to provide current transformers on the neutral point lead-out line of the generator, several for each unit, and each iron core requires more than two secondary windings. When the current transformer adopts a through-type structure, the primary lead needs to pass through the center of the transformer and is short-circuited through a copper bar. The transformer is installed in the generator engine room, and its primary lead will inevitably be stressed and vibrate during the operation of the unit, affecting the accuracy of measuring instruments and protection devices. Therefore, wire clamps need to be set at both the upper and lower ends of the primary lead for fastening. The unreasonable part of the original neutral point lead clamp structure design is that the shim iron is too long and the structure is heavy; the creepage distance between the steel plate and the lead-out line copper bar is small, and the temperature fluctuates, which poses a hidden danger to the safe operation of the unit.

[0003] Therefore, a novel installation structure for the primary lead of a current transformer that can solve the above problems is needed. Summary of the Invention

[0004] In view of the above problems, the object of the present invention is to provide a novel installation structure for the primary lead of a current transformer, including a cooling device and a wire clamping device. The present invention has the advantages of convenient clamping, delicate appearance, reduced processing cost, reduced self-weight, increased creepage distance, and maintaining a constant temperature, which is beneficial to the safe and stable operation of the unit.

[0005] The technical solution adopted by the present invention to solve the above technical problems is: a novel installation structure for the primary lead of a current transformer, including a cooling device and a wire clamping device. The cooling device is fixed at one end of the wire clamping device. The cooling device includes a cooling box and a curved round steel. The curved round steel is fixed on the rubber bracket inside the cooling box. The head of the curved round steel is provided with a thread. The wire clamping device includes an epoxy glass cloth tube and a wire clamp. The epoxy glass cloth tube is threadedly connected to the head of the curved round steel through a thread and nut A.

[0006] Further, nuts A and B are provided on both sides of the epoxy glass cloth tube, and a wire clamp is sleeved inside. A stop washer is provided between nut A and the epoxy glass cloth tube.

[0007] Further, a plug is provided at the upper end of the cooling box. The cooling box is fixedly connected to the reinforcing rib by welding, and the other side of the reinforcing rib is fixedly connected to the connecting plate by welding.

[0008] Further, one end of the curved round steel is sleeved with a wire clamp. The wire clamp is arranged at the junction of the epoxy glass cloth tube and the curved round steel, and is fixed in the epoxy glass cloth tube by nuts A and B on both sides of the epoxy glass cloth tube.

[0009] Further, one end of the cooling box is provided with a through hole. Both ends of the curved round steel respectively penetrate through the through hole and extend out of the cooling box. The curved round steel and the cooling box are fixedly connected by nut B.

[0010] Further, a rubber ring is sleeved outside the curved round steel, and the rubber ring is located inside the through hole.

[0011] The advantages of the present invention are as follows: The present invention provides a novel installation structure for the primary lead of a current transformer, including a cooling device and a wire clamping device. The cooling device includes a cooling box, and a curved round steel is arranged inside the cooling box. The purpose is to increase the creepage distance. The cooling box is used to fill an insulating medium. On the one hand, it prevents conduction between the round steels through the medium, and on the other hand, it reduces the temperature, enabling the device to operate stably at an ideal temperature for a long time. Nuts are provided on both sides of the epoxy glass cloth tube of the wire clamping device, and a stop washer is also provided on one side of the front end. In this way, it can effectively prevent the wire clamping device from loosening due to the vibration generated during the operation of the unit. Therefore, the present invention has the advantages of convenient installation, simple appearance, cost reduction, reduction of the equipment self-weight, maintaining a constant temperature, increased creepage distance, and stable operation of the unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative efforts.

[0013] Figure 1 is a schematic three-dimensional structure diagram of the present invention;

[0014] Figure 2 is a schematic internal structure diagram of the present invention;

[0015] Figure 3 is a schematic partial cross-sectional view of the internal structure of the present invention;

[0016] Among them:

[0017] 1. Cooling device; 2. Cooling box; 3. Plug;

[0018] 4. Reinforcing rib; 5. Connecting plate; 6. Thread;

[0019] 7. Curved round steel; 8. Insulating cooling medium; 9. Nut A;

[0020] 10. Nut B; 11. Epoxy glass cloth tube; 12. Wire clamping device;

[0021] 13. Stop washer; 14. Wire clamp; 15. Rubber ring;

[0022] 16. Rubber bracket. Detailed implementation manners

[0023] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0024] In the description of the present invention, it should be noted that, unless otherwise clearly defined and limited, the terms

[0025] "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It 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 cannot be understood as a limitation to the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. The terms "installation", "connection", "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.

[0026] Embodiment 1:

[0027] Figure 1 is a three-dimensional structure schematic diagram of the present invention, Figure 2 is an internal structure schematic diagram of the present invention, as Figure 1 and Figure 2A novel installation structure of the primary lead wire of a current transformer is shown, which includes a cooling device 1 and a wire clamping device 12. The cooling device 1 has a cooling box 2. This cooling box 2 is made by welding and its airtightness needs to be ensured. An opening is made on the upper surface of the cooling box 2, and a cock 3 is provided. The cock 3 has a sealing washer. Before welding and sealing the cooling box 2, the curved round steel 7 needs to be installed in the cooling box 2 first, with the threaded end 6 facing outwards. A rubber ring 15 is installed at the contact position between the curved round steel 7 and the cooling box 2. The curved part of the curved round steel 7 is placed on the rubber bracket 16 inside the cooling box 2 and fixed. Then the cooling box 2 is welded and sealed. A connecting plate 5 is welded at the tail end of the cooling box 2. There is a reinforcing rib 4 between the connecting plate 5 and the cooling box 2. After welding, the airtightness is detected by blowing air at the cock 3. At the threaded part 6 of the curved round steel 7, first install the nut B 10, then put on the epoxy glass cloth tube 11, insert the wire clamp 14, then put on the lock washer 13, and finally screw on the nut A 9. The nut A 9 on one side of the epoxy glass cloth tube 11 has a lock washer 13 to prevent the nut A 9 from loosening. There is a nut B 10 on the other side of the epoxy glass cloth tube 11, which can form a two-way turning force to further prevent loosening. Then the device is welded to the unit through the connecting plate 5.

[0028] Working mode: The present invention provides a novel installation structure for the primary lead of a current transformer, including a cooling device 1 and a wire clamping device 12. The cooling device 1 has a cooling box 2, which is made by welding and needs to ensure airtightness. An opening is made on the upper surface of the cooling box 2, and a cock 3 is provided. The cock 3 has a sealing washer. Before welding and sealing the cooling box 2, the curved round steel 7 needs to be installed in the cooling box 2 first, with the threaded end 6 facing outwards. A rubber ring 15 is installed at the contact position between the curved round steel 7 and the cooling box 2. The curved part of the curved round steel 7 is fixed on the rubber bracket 16 inside the cooling box 2. Then the cooling box 2 is welded and sealed. A connecting plate 5 is welded at the end of the cooling box 2. There is a reinforcing rib 4 between the connecting plate 5 and the cooling box 2. After welding, air is blown at the cock 3 to detect airtightness. At the threaded part 6 of the curved round steel 7, first install the nut B 10, then put on the epoxy glass cloth tube 11, insert the wire clamp 14, then put on the stop washer 13, and finally screw on the nut A 9. The nut A 9 on one side of the epoxy glass cloth tube 11 has a stop washer 13 to prevent the nut A 9 from loosening. There is a nut B 10 on the other side of the epoxy glass cloth tube 11, which can form a bidirectional rotation force to further prevent loosening. Then the device is welded to the unit through the connecting plate 5. The present invention increases the creepage distance. The cooling box is used to fill the insulating cooling medium. On the one hand, it prevents conduction between the round steels through the medium. On the other hand, it reduces the temperature, enabling the device to operate stably at an ideal temperature for a long time. Nuts are provided on both sides of the epoxy glass cloth tube of the wire clamping device, and a stop washer is also provided on the front end side. This can effectively prevent the wire clamping device from loosening due to the vibration generated during the operation of the unit. Therefore, the present invention has the advantages of convenient installation, simple appearance, constant temperature, reduced product self-weight, reduced loosening, and increased creepage distance.

[0029] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A novel installation structure for the primary lead of a current transformer, comprising a cooling device (1) and a wire clamping device (12). Characterized in that: The cooling device (1) includes a cooling box (2) and a curved round steel (7). The curved round steel (7) is fixed on a rubber bracket (16) inside the cooling box (2). A thread (6) is provided at the head of the curved round steel (7). The wire clamping device (12) includes an epoxy glass cloth tube (11) and a wire clamp (14). The epoxy glass cloth tube (11) is threadedly connected to the head of the curved round steel (7) through the thread (6) and nut A (9). Nuts A (9) and nuts B (10) are provided on both sides of the epoxy glass cloth tube (11). A wire clamp (14) is sleeved inside. A stop washer (13) is provided between the nut A (9) and the epoxy glass cloth tube (11). One end of the curved round steel (7) is sleeved with a wire clamp (14). The wire clamp (14) is arranged at the junction of the epoxy glass cloth tube (11) and the curved round steel (7) and is fixed in the epoxy glass cloth tube (11) by nuts A (9) and nuts B (10) on both sides of the epoxy glass cloth tube (11). A plug cock (3) is provided at the upper end of the cooling box (2). The cooling box (2) and the reinforcing rib (4) are fixedly connected by welding. The other side of the reinforcing rib (4) and the connecting plate (5) are fixedly connected by welding.

2. The novel installation structure for the primary lead of a current transformer according to claim 1, Characterized in that: A through hole is provided at one end of the cooling box (2). Both ends of the curved round steel (7) respectively penetrate through the through hole and extend out of the cooling box. The curved round steel (7) and the cooling box (2) are fixedly connected by a nut B (10).

3. The novel installation structure for the primary lead of a current transformer according to claim 2, Characterized in that: A rubber ring (15) is sleeved outside the curved round steel (7). The rubber ring (15) is located inside the through hole.

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