Medium-pressure sleeve

Abstract

The medium-voltage bushing comprises a bushing, an umbrella cover, a conducting rod, a capacitive screen, a flange and a grounding screw, the umbrella cover is sleeved on the bushing, the conducting rod is arranged in the bushing in a penetrating manner, two ends of the conducting rod extend out of the bushing, the capacitive screen is arranged in the bushing, the flange is fixed outside the bushing, and the grounding screw is in threaded connection with the flange and is in contact with an end screen of the capacitive screen. The capacitive screen arrangement rod sleeve side is used for uniformizing the field intensity; and a spring contact finger is arranged in the sleeve and is in contact with the zero screen of the capacitive screen. Batch flow production can be achieved, and the manufacturing cost is low. A traditional pure porcelain sleeve and a traditional epoxy pouring sleeve are replaced, and the low-partial-discharge high-voltage switch has the advantages of being small in size, low in cost, low in partial discharge and reliable in performance.

Description

Technical Field

[0001] This utility model relates to a medium-pressure bushing. Background Technology

[0002] Currently, medium-pressure bushings generally adopt a pure ceramic structure, and ceramic medium-pressure bushings (such as...) Figure 1 The structure mainly consists of a conductive rod 3, a nut 8, a porcelain sleeve 7, a flange 5, a sealing ring, and a gasket. The disadvantage of pure porcelain medium-voltage bushings is that they rely primarily on transformer oil as the insulator, resulting in a large volume and heavy weight.

[0003] Another type is epoxy cast sleeve (such as...) Figure 2 The epoxy bushing's structure mainly consists of an internal grounding shield, cast from epoxy resin, assembled with a pressure plate 9, sealing ring, and locking bolts. This structure is large in size and has poor partial discharge performance. Summary of the Invention

[0004] This invention provides a medium-pressure bushing to address the problems existing in the prior art. This invention allows for mass production and has low manufacturing costs. It replaces traditional pure ceramic bushings and epoxy-cast bushings, offering advantages such as small size, low cost, low partial discharge, and reliable performance.

[0005] The technical solutions adopted in this utility model are as follows:

[0006] A medium-voltage bushing includes a bushing, a canopy, a conductive rod, a capacitor screen, a flange, and a grounding screw. The canopy is fitted onto the bushing, the conductive rod passes through the bushing with both ends extending outside the bushing, the capacitor screen is located inside the bushing, and the flange is fixed outside the bushing. The capacitor screen is arranged on the outside of the bushing to uniformly distribute the electric field strength. The grounding screw is threaded onto the flange and contacts the end screen of the capacitor screen. A spring contact finger is provided inside the bushing, and the spring contact finger contacts the zero screen of the capacitor screen.

[0007] Furthermore, the sleeve is also wrapped with crepe paper, and a capacitive screen is inserted between the crepe paper loops.

[0008] This utility model has the following beneficial effects:

[0009] This invention features several capacitor screens arranged on the outside of the bushing to uniformly induct the electric field. It is then vacuum-cast using pure epoxy resin. The lower end of the bushing is machined to the zero-screen position, and a spring-loaded contact finger connects the zero-screen to the conductive rod. This design replaces existing dry-type medium-voltage bushings, significantly reducing production costs while maintaining the strength of the main insulation and partial discharge performance. This bushing uses a metal flange structure for installation on the transformer tank cover, making it easy to install, compact, low-cost, and providing reliable partial discharge performance. Attached Figure Description

[0010] Figure 1 This is a structural diagram of a ceramic medium-pressure bushing.

[0011] Figure 2 This is a structural diagram of an epoxy cast sleeve.

[0012] Figure 3 This is a structural diagram of the present invention. Detailed Implementation

[0013] The present invention will be further described below with reference to the accompanying drawings.

[0014] like Figure 3 As shown, this utility model discloses a medium-voltage bushing, including a bushing 1, an umbrella sleeve 2, a conductive rod 3, a capacitor screen 4, a flange 5, and a grounding screw. The umbrella sleeve 2 is sleeved on the bushing 1, the conductive rod 3 passes through the bushing 1 and extends out of the bushing at both ends, the capacitor screen 4 is disposed inside the bushing 1, the flange 5 is fixed outside the bushing 1, and the grounding screw is threadedly connected to the flange 5 and contacts the end screen of the capacitor screen 4.

[0015] A capacitor screen 4 is arranged on the outside of the sleeve 1 and then cast with epoxy resin. A spring contact finger 6 is installed inside the sleeve 1, and the spring contact finger 6 contacts the O-screen of the capacitor screen 4.

[0016] This invention features several capacitor screens arranged on the outside of the bushing to uniformly induct the electric field. It is then vacuum-cast using pure epoxy resin. The lower end of the bushing is machined to the zero-screen position, and a spring-loaded contact finger connects the zero-screen to the conductive rod. This design replaces existing dry-type medium-voltage bushings, significantly reducing production costs while maintaining the strength of the main insulation and partial discharge performance. This bushing uses a metal flange structure for installation on the transformer tank cover, making it easy to install, compact, low-cost, and providing reliable partial discharge performance.

[0017] The sleeve is made by winding crepe paper, arranging several capacitor screens to uniformly strengthen the field, and then vacuum casting and curing it with pure epoxy resin. This allows for mass production and low manufacturing costs. It replaces traditional pure ceramic sleeves and epoxy cast sleeves, and has the advantages of small size, low cost, low partial discharge, and reliable performance.

[0018] The flange is a grounding shield. The shield is connected to the conductive rod by a spring contact finger. A rubber umbrella sleeve is glued on, and the cap capacitor core is glued on with epoxy resin. Finally, the conductive rod is fixed by a lock nut.

[0019] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements can be made without departing from the principle of the present utility model, and these improvements should also be considered within the protection scope of the present utility model.

Claims

1. A medium-voltage bushing, comprising a bushing (1), a canopy (2), a conductive rod (3), a capacitor screen (4), a flange (5), and a grounding screw, wherein the canopy (2) is fitted onto the bushing (1), the conductive rod (3) passes through the bushing (1) and extends out of the bushing at both ends, the capacitor screen (4) is disposed inside the bushing (1), and the flange (5) is fixed to the outside of the bushing (1), characterized in that: The capacitor screen (4) is arranged on the outside of the sleeve to uniformly measure the field strength. The grounding screw is threaded onto the flange (5) and contacts the end screen of the capacitor screen (4). A spring contact finger (6) is set inside the sleeve (1) and contacts the zero screen of the capacitor screen (4).

2. The medium-pressure bushing as described in claim 1, characterized in that: The sleeve is also wrapped with crepe paper, and a capacitive screen (4) is inserted between the crepe paper wrappings.

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