Device for increasing creepage distance of transformer and transformer for temporarily increasing creepage distance

Abstract

The utility model relates to a device for increasing the creepage distance of a transformer and a transformer for temporarily increasing the creepage distance, the device for increasing the creepage distance of the transformer comprises an insulating plate, three high-voltage bushings are vertically inserted on the insulating plate, and the three high-voltage bushings are arranged on the insulating plate in rows at intervals along the left-right direction. The high-voltage bushing located in the middle is vertically arranged, and the upper portions of the high-voltage bushings located on the two sides are bent in the direction away from the high-voltage bushing located in the middle. The transformer capable of temporarily increasing the creepage distance comprises a transformer body and the device arranged above the transformer body and used for increasing the creepage distance of the transformer, and the bottom ends of the conducting rods of the three high-voltage bushings are connected with the top ends of the conducting rods of the three high-voltage bushings of the transformer body in a one-to-one correspondence mode. According to the utility model, the creepage distance and the air gap of the transformer can be quickly increased, so that the transformer is suitable for being used in environments or occasions with higher requirements on the creepage distance and the air gap.

Description

Technical Field

[0001] The utility model relates to a device for increasing the creepage distance of a transformer and a transformer for temporarily increasing the creepage distance, belonging to the technical field of transformers. Background Art

[0002] For transformers used in high-altitude areas, the insulation strength of the air will be reduced due to the thin ambient air. In order to achieve the same withstand voltage, the creepage distance and air gap of the transformer need to be increased to avoid accidents. In the prior art, there are various ways to increase the creepage distance and air gap of transformers. For example, the utility model patent with publication number CN210110496U discloses a transformer that effectively increases the creepage distance. The transformer includes a magnetic core, a primary coil wound on the outer surface of the magnetic core, and a secondary coil wound outside the primary coil. Insulating tape is provided between the primary and secondary coils. A primary coil pin fixing plate extends outward from one side of the bottom of the magnetic core, and a secondary coil pin fixing plate extends outward from the other side of the bottom of the magnetic core. The secondary coil pin fixing plate is provided with a primary coil pin connected to the input end of the primary coil. The secondary coil pin fixing plate is provided with two secondary coil pin slots. The two secondary coil pins are separated by a first wire slot and a second wire slot. A partition is provided between the first wire slot and the second wire slot. The secondary coil pin is fixed in the secondary coil pin slot. The output end of the secondary coil passes through the first wire slot and is connected to the secondary coil pin. The advantage of this transformer is that the creepage distance is increased without increasing the volume. For another example, the utility model patent with publication number CN217640951U discloses a high-voltage transformer structure with increased creepage distance, including an end plate, a primary coil frame, a secondary coil frame, and an iron core. The end plate is provided with a U-shaped end plate creepage groove, the primary coil frame is provided with a hole groove, and the secondary coil frame is provided with a U-shaped coil frame creepage groove. The transformer structure is simple in structure and can effectively increase the insulation distance (creepage distance) to solve the creepage problem without increasing the height of the transformer. At the same time, it improves the transformer's voltage resistance and heat dissipation area, reduces the size of the transformer, and improves performance. The above technologies each have their own characteristics, and can effectively increase the creepage distance of the transformer, making it suitable for use in special environments (such as high altitude areas). However, the creepage distance of the above transformers and transformers that increase the creepage distance by other means in the prior art are fixed and cannot be replaced or used in emergency situations in special environments with different requirements for the creepage distance of the transformer. For example, when a transformer used in an area with an altitude of three or four thousand meters fails and there is no spare transformer in the area, it takes a long time to transport a new transformer from the manufacturer or dealer. Spare transformers in nearby areas (such as areas with an altitude of one or two thousand meters) cannot be used for quick emergency response due to insufficient creepage distance and air gap, which can easily cause the power system to malfunction for a long time. Utility Model Content

[0003] In order to overcome the above-mentioned defects of the prior art, the utility model provides a device for increasing the creepage distance of a transformer and a transformer for temporarily increasing the creepage distance, which can quickly increase the creepage distance and air gap of the transformer and expand the scope and occasions of application.

[0004] The technical solution for achieving the above-mentioned object of the present invention is: a device for increasing the creepage distance of a transformer, comprising an insulating plate, three high-voltage bushings being vertically inserted into the insulating plate, the three high-voltage bushings being arranged in rows spaced apart in the left-right direction on the insulating plate, the high-voltage bushing located in the middle being arranged vertically, and the upper portions of the high-voltage bushings located on both sides being bent in a direction away from the high-voltage bushing located in the middle.

[0005] The high-voltage bushing includes but is not limited to a conductive rod and an outer insulation (also called an outer insulation layer, an outer insulation sleeve or an outer insulation bushing, including an shed) sleeved outside the conductive rod.

[0006] The insulating board is arranged horizontally and can be made of epoxy resin board or PVC board, or can be made of hard board made of other insulating materials in the prior art.

[0007] Preferably, the upper portion of the high-voltage bushing located on the left side is bent to the left.

[0008] Preferably, the upper portion of the high-voltage bushing located on the right side is bent to the right.

[0009] Furthermore, the upper portion of the high-voltage bushing on the left side is bent first to the left and then to the top, and the upper portion of the high-voltage bushing on the right side is bent first to the right and then to the top.

[0010] Preferably, the high-voltage bushing located in the middle is fixedly connected to the insulating plate.

[0011] Preferably, the high-voltage bushings on both sides are connected to the insulating plate in a sliding manner and are provided with a sliding positioning structure. The insulating plate is provided with a sliding groove suitable for the corresponding high-voltage bushing to slide in the left and right directions.

[0012] Preferably, two upper and lower limit plates are fixedly provided on the high-voltage bushings on both sides, wherein the upper limit plate is located above the insulating plate and is in sliding contact with the top surface of the insulating plate, and the lower limit plate is located below the insulating plate and is in sliding contact with the bottom surface of the insulating plate.

[0013] The sliding positioning structure can be a damping sleeve (usually a rubber sleeve) fixedly mounted on the corresponding high-voltage bushing, the damping sleeve is located between the two limit plates, and the damping sleeve and the groove wall of the corresponding slide groove are in damping sliding cooperation, or the sliding positioning structure is a top screw provided on the limit plate (usually the limit plate located above) of the corresponding high-voltage bushing (the high-voltage bushing located on the left and the high-voltage bushing located on the right).

[0014] Preferably, the parts of the high-voltage bushings located below the insulating plate have the same height, that is, the bottom ends of the conductive rods of the high-voltage bushings have the same height.

[0015] Preferably, the bottom end of the conductive rod of the high-voltage bushing is provided with a conductive plug-in slot suitable for plugging in the top end of the conductive rod of the transformer high-voltage bushing.

[0016] Furthermore, the conductive plug-in slot is tubular, and its inner diameter matches the outer diameter of the top end of the conductive rod of the transformer high-voltage bushing.

[0017] Preferably, the bottom end of the outer insulation of the high-voltage bushing is provided with an elastic insulating sleeve (for example, a rubber sleeve) extending downward, and the conductive plug slot is located in the elastic insulating sleeve.

[0018] Furthermore, the bottom end of the elastic insulating sleeve is lower than the bottom end of the corresponding conductive plug slot.

[0019] Furthermore, an elastic rubber ring is provided at the bottom end of the elastic insulating sleeve, and the inner diameter of the elastic rubber ring in a state without elastic deformation is smaller than the inner diameter of the elastic insulating sleeve.

[0020] Preferably, a bracket is provided on the bottom surface of the insulating plate.

[0021] The number of the brackets may be two, which are respectively arranged on the left and right sides of the bottom surface of the insulating plate.

[0022] Furthermore, the bracket is a telescopic bracket.

[0023] A transformer with temporarily increased creepage distance comprises a transformer body and a device for increasing the creepage distance of the transformer. The device for increasing the creepage distance of the transformer adopts any one of the devices for increasing the creepage distance of the transformer disclosed in the present utility model. The device for increasing the creepage distance of the transformer is arranged above the transformer body, and the bottom ends of the conductive rods of the three high-voltage bushings are respectively connected to the top ends of the conductive rods of the three high-voltage bushings of the transformer body in a one-to-one correspondence.

[0024] The beneficial effects of this utility model are: it can quickly increase the creepage distance and air gap of a transformer, making the transformer suitable for use in environments or situations with higher creepage distance and air gap requirements, especially for emergency use in areas or situations such as high altitudes, thereby helping to expand the scope and application of transformers. Based on field experiments and actual use, the improvement of this device for increasing the creepage distance of a spare transformer suitable for use at an altitude of 1,000 to 2,000 meters can enable temporary use at an altitude of 3,000 to 4,000 meters. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a structural diagram of an embodiment of the device for increasing the creepage distance of a transformer according to the present invention;

[0026] Figure 2 yes Figure 1 A top view of

[0027] Figure 3 It is a structural schematic diagram of an implementation method of a transformer with temporarily increased creepage distance according to the present invention. DETAILED DESCRIPTION

[0028] All directional indications (such as up, down, left, right, top, bottom, etc.) in the embodiments of the present invention are only used to explain the relative position relationship and movement of the various components under a certain specific posture (as shown in the accompanying drawings) and do not constitute a limitation on the actual use direction. If the specific posture changes, the directional indication will also change accordingly.

[0029] See also Figure 1 and Figure 2The utility model discloses a device for increasing the creepage distance of a transformer, particularly suitable for use with 10kV oil-immersed distribution transformers. The device comprises an insulating plate 1, on which three high-voltage bushings 2 are vertically mounted. The three high-voltage bushings are arranged in rows spaced apart in the left-right direction of the insulating plate. The central high-voltage bushing is arranged vertically, while the upper portions of the high-voltage bushings on either side are bent away from the central high-voltage bushing. The high-voltage bushings include, but are not limited to, conductive rods and outer insulation (also known as outer insulation layer, outer insulation sleeve, or outer insulation sleeve, including shed skirts) sleeved outside the conductive rods. Such an arrangement increases the creepage distance and air gap between adjacent high-voltage bushings compared to existing transformers. When the device for increasing the creepage distance of the transformer is installed on the existing transformer and the bottom ends of the conductive rods of the three high-voltage bushings are respectively connected one-to-one with the top ends of the conductive rods of the three high-voltage bushings of the existing transformer, the creepage distance and air gap of the existing transformer can be quickly and effectively increased, making the existing transformer suitable for use in environments or occasions with higher requirements for creepage distance and air gap, especially suitable for emergency use in areas or occasions such as high altitudes, which helps to expand the application range and occasions of the transformer.

[0030] The insulating board is arranged horizontally and can be made of epoxy resin board or PVC board, or can be made of hard board made of other insulating materials in the prior art.

[0031] The upper portion of the high-voltage bushing on the left is preferably bent to the left, and the upper portion of the high-voltage bushing on the right is bent to the right. This arrangement can maximize the creepage distance and air gap between adjacent high-voltage bushings.

[0032] The upper portion of the high-voltage bushing on the left side is preferably bent first to the left and then upward, while the upper portion of the high-voltage bushing on the right side is preferably bent first to the right and then upward. This arrangement allows the top ends of the conductive rods of the three high-voltage bushings (or the wire connection terminals provided at the top ends of the conductive rods) to all face vertically upward, facilitating connection to external devices while complying with relevant standards.

[0033] The central high-voltage bushing is preferably fixedly connected to the insulating plate, for example, via a flange connection. The high-voltage bushings on either side are preferably slidably connected to the insulating plate and provided with a sliding positioning structure. The insulating plate is provided with a slide groove 3 for the corresponding high-voltage bushing to slide in the left-right direction. Specifically, the insulating plate includes two such slide grooves, each extending in the left-right direction and adapted for sliding the corresponding high-voltage bushing (the left-side bushing or the right-side bushing). This arrangement allows for adjustable spacing between adjacent high-voltage bushings, enabling the transformer creepage distance increasing device to be adapted for modifying the creepage distance and air gap of existing transformers of different models (primarily those with different spacing between adjacent high-voltage bushings).

[0034] The high-voltage bushings on both sides are preferably fixed with upper and lower limit plates at intervals, wherein the upper limit plate is located above the insulating plate and in sliding contact with the top surface of the insulating plate, and the lower limit plate is located below the insulating plate and in sliding contact with the bottom surface of the insulating plate. The setting of the limit plates can limit the vertical position of the high-voltage bushings on both sides on the insulating plate to prevent the high-voltage bushings on both sides from moving vertically on the insulating plate. The top and bottom of the chute can be stepped, and the width and height of the steps at the top and bottom correspond to the width and height of the limit plates, respectively. The limit plates are located in the corresponding steps (or step grooves) of the corresponding chute, so that the top and bottom surfaces of the insulating plate are both flat, making the device more regular.

[0035] The sliding positioning structure can adopt any positioning structure suitable for sliding fit in the rod groove or column groove in the existing technology. For example, a damping sleeve (usually a rubber sleeve) is provided on the fixed sleeve of the high-voltage bushing (the high-voltage bushing located on the left and the high-voltage bushing located on the right), and the damping sleeve is located between the two limiting plates. The damping sleeve and the groove wall of the corresponding slide groove have a damping sliding fit, and the damping effect of the damping sleeve is utilized to achieve the positioning of the high-voltage bushing after sliding in the corresponding slide groove; for another example, a top screw is provided on the limiting plate (usually the upper limiting plate) of the high-voltage bushing (the high-voltage bushing located on the left and the high-voltage bushing located on the right), and the fastening effect of the top screw is utilized to achieve the positioning of the high-voltage bushing after sliding in the corresponding slide groove.

[0036] The high-voltage bushing located in the middle and the insulating plate can also be connected in a sliding fit manner. The sliding fit structure, sliding positioning structure and limiting structure can be the same as the sliding fit structure, sliding positioning structure and limiting structure between the high-voltage bushings and the insulating plates located on both sides. At this time, the insulating plate can be provided with only one sliding groove, which is suitable for the three high-voltage bushings to slide therein, or three sliding grooves can be provided, which are respectively suitable for the high-voltage bushings with corresponding positions to slide therein.

[0037] The portions of the high-voltage bushings located below the insulating plate are preferably of the same height. Specifically, the bottom ends of the conductive rods of each high-voltage bushing (or the conductive terminals located at the bottom ends of the conductive rods) are at the same height. This facilitates connection to the top ends of the three high-voltage bushings of the existing transformer (or the conductive terminals located at the top ends of the conductive rods). The top ends of the conductive rods of each high-voltage bushing (or the conductive terminals located at the top ends of the conductive rods) are preferably at the same height to facilitate connection to external devices.

[0038] The bottom end of the high-voltage bushing's conductive rod is preferably provided with a conductive insertion slot adapted to receive the top end of a transformer's conductive rod (or a conductive terminal disposed at the top end of the conductive rod). This facilitates quick insertion and connection with the top end of an existing transformer's conductive rod (or a conductive terminal disposed at the top end of the conductive rod), ensuring effective electrical conduction after connection. The conductive insertion slot is preferably tubular, with an inner diameter matching the outer diameter of the top end of the transformer's conductive rod to ensure a secure connection with the top end of the existing transformer's conductive rod.

[0039] The bottom end of the high-voltage bushing's outer insulation is preferably equipped with a downwardly extending elastic insulating sleeve (e.g., a rubber sleeve) 4. The conductive socket is located within this elastic insulating sleeve, with the bottom end of the elastic insulating sleeve lower than the bottom end of the corresponding conductive socket. With this arrangement, when the conductive socket is connected to the top end of the conductive rod of the corresponding high-voltage bushing of an existing transformer, the connection is internally encased by the elastic insulating sleeve, providing effective insulation while also providing dust and water protection.

[0040] The bottom end of the elastic insulating sleeve is preferably provided with an elastic rubber ring, and the inner diameter of the elastic rubber ring in a state without elastic deformation is smaller than the inner diameter of the elastic insulating sleeve, that is, the bottom end of the elastic insulating sleeve is in a contracted state when there is no external force. With this arrangement, when the conductive plug slot is connected to the top end of the conductive rod of the corresponding high-voltage bushing of the existing transformer, the bottom end of the elastic insulating sleeve (that is, the elastic rubber ring) can be tightened on the top of the external insulation of the corresponding high-voltage bushing of the existing transformer, thereby avoiding accidental exposure of the connection between the conductive plug slot and the top end of the conductive rod of the corresponding high-voltage bushing of the existing transformer, thereby ensuring the insulation effect.

[0041] A bracket 5 is preferably provided on the bottom surface of the insulating plate. When the device for increasing the creepage distance of the transformer is connected to the existing transformer, the bracket is supported on the top surface of the existing transformer to prevent the device for increasing the creepage distance of the transformer from tipping over due to its own weight or other external factors.

[0042] The number of the brackets may be two, which are respectively arranged on the left and right sides of the bottom surface of the insulating plate to ensure stable support.

[0043] The support is preferably a telescopic support, suitable for supporting existing transformers of varying sizes (primarily referring to the different heights to which the high-voltage bushing protrudes from the top of the transformer housing). The telescopic support can employ any conventionally telescopic / adjustable support, such as a bushing telescopic support or a folding support.

[0044] See also Figure 3 The present invention also discloses a transformer for temporarily increasing the creepage distance, comprising a transformer body 6 and a device for increasing the creepage distance of the transformer. The device for increasing the creepage distance of the transformer adopts any one of the devices for increasing the creepage distance of the transformer disclosed in the present invention. The device for increasing the creepage distance of the transformer is arranged above the transformer body, and the bottom ends of the conductive rods of the three high-voltage bushings are respectively connected to the top ends of the conductive rods of the three high-voltage bushings of the transformer body in a one-to-one correspondence.

[0045] The area of ​​the insulating plate is no greater than the area of ​​the top wall of the transformer body. Furthermore, the length of the insulating plate is no greater than the length of the top wall of the transformer body, and the width of the insulating plate is no greater than the width of the top wall of the transformer body. This ensures that the transformer body's occupied area remains unchanged after the device for increasing the creepage distance of the transformer is installed.

[0046] Any device for increasing the creepage distance of a transformer of the utility model can be used for any transformer for temporarily increasing the creepage distance of the utility model.

[0047] Any transformer for temporarily increasing creepage distance of the utility model can also adopt any device for increasing creepage distance of the transformer of the utility model.

[0048] Unless otherwise specified or one preferred or optional technical means is a further limitation of another technical means, the preferred and optional technical means disclosed in the present utility model can be arbitrarily combined to form several different technical solutions.

Claims

1. A device for increasing the creepage distance of a transformer, characterized in that It includes an insulating plate, on which three high-voltage bushings are vertically inserted. The three high-voltage bushings are arranged in rows along the left and right directions on the insulating plate. The high-voltage bushing in the middle is arranged vertically, and the upper parts of the high-voltage bushings on both sides are bent in a direction away from the high-voltage bushing in the middle.

2. The device for increasing the creepage distance of a transformer according to claim 1, characterized in that The upper portion of the high-voltage bushing located on the left side is bent to the left.

3. The device for increasing the creepage distance of a transformer according to claim 1, characterized in that The upper portion of the high-voltage bushing located on the right side is bent to the right.

4. The device for increasing the creepage distance of a transformer according to claim 1, 2 or 3, characterized in that The high-voltage bushing located in the middle is fixedly connected to the insulating plate.

5. The device for increasing the creepage distance of a transformer as claimed in claim 4, characterized in that The high-voltage bushings on both sides are connected to the insulating plate in a sliding manner and are provided with a sliding positioning structure. The insulating plate is provided with a sliding groove suitable for the corresponding high-voltage bushing to slide in the left and right directions.

6. The device for increasing the creepage distance of a transformer as claimed in claim 5, characterized in that The parts of the high-voltage bushings located below the insulating plate have the same height.

7. The device for increasing the creepage distance of a transformer according to claim 6, characterized in that The bottom end of the conductive rod of the high-voltage bushing is provided with a conductive plugging slot suitable for plugging the top end of the conductive rod of the transformer high-voltage bushing.

8. The device for increasing the creepage distance of a transformer according to claim 7, characterized in that An elastic insulating sleeve extending downward is provided at the bottom end of the outer insulation of the high-voltage bushing, and the conductive plug-in slot is located inside the elastic insulating sleeve.

9. The device for increasing the creepage distance of a transformer according to claim 8, characterized in that A bracket is provided on the bottom surface of the insulating plate.

10. Transformer with temporarily increased creepage distance, characterized by The utility model comprises a transformer body and a device for increasing the creepage distance of the transformer, wherein the device for increasing the creepage distance of the transformer adopts the device for increasing the creepage distance of the transformer according to any one of claims 1 to 9, and the device for increasing the creepage distance of the transformer is arranged above the transformer body, and the bottom ends of the conductive rods of the three high-voltage bushings are respectively connected to the top ends of the conductive rods of the three high-voltage bushings of the transformer body in a one-to-one correspondence.

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