High-voltage ascending flanged base device suitable for oil-immersed transformer

Abstract

The utility model discloses a high-voltage ascending flanged base device suitable for an oil-immersed transformer. An auxiliary oil tank is arranged on the outer side of a main oil tank of the oil-immersed transformer. The inner side of the oil passing hole is communicated with the main oil tank, and the outer side of the oil passing hole is communicated with the auxiliary oil tank. A tail wiring terminal of the high-voltage bushing is fixedly installed on an outer wall plate of the auxiliary oil tank through a connecting flange, and the inner end of the tail wiring terminal is located in the auxiliary oil tank. And a cable connected with the inner end of the tail wiring terminal penetrates into the main oil tank through the oil hole and is connected with a transformer winding. The high-voltage ascending flanged base installed on the side wall of the transformer is the auxiliary oil tank in a box body form, the high-voltage wire terminal and the inner end of the high-voltage bushing are both connected to the outer side wall of the auxiliary oil tank, a certain distance exists between the high-voltage wire terminal and the inner end of the high-voltage bushing and the outer wall of the main oil tank, and the electrical distance between the high-voltage wire terminal and electrical elements in the main oil tank is larger; therefore, the safety device has better safety performance.

Description

Technical Field

[0001] The utility model relates to a transformer high-voltage booster seat device, in particular to a high-voltage booster seat device suitable for an oil-immersed transformer. Background Art

[0002] An oil-immersed transformer is a box-type transformer that uses transformer oil for insulation. This type of transformer has good insulation performance and can effectively reduce the loss and impact of the insulating medium. In addition, oil-immersed transformers usually have a higher capacity and a larger voltage level, and are suitable for large power systems such as power plants and power stations. As a prior art, the high-voltage bushing of an oil-immersed transformer is usually directly installed on the side wall of the transformer tank by welding screws on the side wall. Because the bushing itself has a certain weight, the screw is easy to deform after long-term use. Therefore, this structure has low strength and poor structural stability.

[0003] On the other hand, according to this installation method, the bushing tail terminal extends into the fuel tank, and the electrical distance between the bushing tail terminal and the electrical components in the fuel tank is short, which is difficult to meet safety requirements. At present, there is no literature report or product solution to solve this technical problem.

[0004] For example, the Chinese utility model with authorization announcement number CN201562552U discloses "an oil-immersed power transformer", which includes an oil tank and a body immersed in the oil tank, the body is provided with high-voltage wire terminals and low-voltage wire terminals for connecting external cables, and the high-voltage wire terminals and low-voltage wire terminals extend out of the oil tank through the side wall of the oil tank. The high-voltage wire terminals and low-voltage wire terminals are respectively covered with high-voltage bushings and low-voltage bushings for insulation protection, and the side wall of the oil tank is provided with high-voltage riser and low-voltage riser for carrying the high-voltage bushing and low-voltage bushing, respectively. It can be seen from the patent specification and drawings that the high-voltage wire terminals and the inner end of the high-voltage bushing are both located inside the oil tank, and there is also the problem of a short electrical distance between the wiring terminal at the tail of the bushing and the electrical components in the oil tank, resulting in poor safety performance. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a high-voltage riser device suitable for oil-immersed transformers. Firstly, the safety performance of the transformer is further improved by increasing the electrical distance between the terminal block at the tail end of the high-voltage bushing and the electrical components in the oil tank; secondly, the installation stability of the high-voltage bushing is further improved.

[0006] The technical solution of the utility model is as follows:

[0007] A high-voltage booster device suitable for an oil-immersed transformer, comprising a main oil tank of the oil-immersed transformer, the main oil tank having a main oil tank side wall plate, and also comprising a high-voltage bushing for mounting a high-voltage wire terminal of the oil-immersed transformer, the high-voltage booster device also comprising an auxiliary oil tank; the auxiliary oil tank comprises an auxiliary oil tank outer wall plate arranged on the outside of the main oil tank side wall plate, the lower side of the auxiliary oil tank outer wall plate is connected to the main oil tank side wall plate through the auxiliary oil tank lower wall plate; the two sides of the auxiliary oil tank outer wall plate are respectively connected to the main oil tank through an auxiliary oil tank side wall plate The side wall plate of the auxiliary tank is connected to the side wall plate of the main tank through the upper wall plate of the auxiliary tank; the side wall plate of the main tank is provided with an oil through hole which is communicated with the main tank on the inside and communicated with the auxiliary tank on the outside; the tail terminal of the high-voltage bushing is fixedly mounted on the outer wall plate of the auxiliary tank through a connecting flange, and the inner end of the tail terminal is located inside the auxiliary tank; the inner end of the tail terminal is connected to a cable, which passes into the main tank through the oil through hole and is connected to the transformer winding in the main tank.

[0008] Preferably, a hand hole is provided on the upper wall plate of the auxiliary oil tank, and a hand hole cover plate is connected to the outer side of the hand hole via a hand hole flange.

[0009] Compared with the prior art, the utility model has the following beneficial effects:

[0010] First, the high-voltage riser installed on the side wall of the transformer of the utility model is a box-shaped auxiliary oil tank. The high-voltage wire terminal and the inner end of the high-voltage bushing are connected to the outer wall of the auxiliary oil tank, which is at a certain distance from the outer wall of the main oil tank. The electrical distance between the auxiliary oil tank and the electrical components in the main oil tank is larger. Therefore, the utility model has better safety performance.

[0011] Second, the utility model has a hand hole on the upper wall plate of the lifting seat, which is convenient for assembling the sleeve tail terminal and connecting it with the cable, ensuring the installation reliability, and also convenient for observing the reliability of the sleeve terminal lead connection, and convenient for fastening or other maintenance of the sleeve terminal lead part.

[0012] Third, according to the utility model, it is not necessary to weld the connecting screw on the side wall of the main oil tank, but the high-pressure bushing is connected to the front wall of the auxiliary oil tank as a raised seat through a flange, so there is no problem of screw deformation and the structural stability is better.

[0013] Fourthly, the auxiliary oil tank of the utility model is connected with the main oil tank in oil circuit, and transformer oil flows mutually between the main and auxiliary oil tanks, which is more conducive to cooling of transformer oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of an embodiment of the utility model.

[0015] Figure 2It is a side view schematic diagram of the auxiliary fuel tank of the embodiment of the utility model.

[0016] In the figure, 1. side wall plate of main oil tank, 1-1. oil through hole, 2. upper wall plate of auxiliary oil tank, 3. side wall plate of auxiliary oil tank, 4. outer wall plate of auxiliary oil tank, 5. lower wall plate of auxiliary oil tank, 6. hand hole flange, 7. hand hole cover plate, 8. connecting flange, 9. high voltage bushing, 10. cable. DETAILED DESCRIPTION

[0017] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0018] like Figure 1 and Figure 2 The embodiment of the utility model comprises a main oil tank of an oil-immersed transformer, wherein the main oil tank has a main oil tank side wall plate 1 and also comprises a high-voltage bushing 9 for installing a high-voltage wire terminal of the oil-immersed transformer.

[0019] The embodiment of the utility model further includes a sub-tank as a high-pressure booster seat, the sub-tank includes a sub-tank outer wall plate 4 arranged outside the main tank side wall plate 1 and parallel to the main tank side wall plate 1, the lower side of the sub-tank outer wall plate 4 is connected to the main tank side wall plate 1 through the sub-tank lower wall plate 5, the two sides of the sub-tank outer wall plate 4 are connected to the main tank side wall plate 1 through a sub-tank side wall plate 3, and the upper side of the sub-tank outer wall plate 4 is connected to the main tank side wall plate 1 through the sub-tank upper wall plate 2. The sub-tank outer wall plate 4, the sub-tank lower wall plate 5, the two sub-tank side wall plates 3, the sub-tank upper wall plate 2 and the main tank side wall plate 1 are welded together to form a closed box body as the sub-tank.

[0020] The main oil tank side wall plate 1 is provided with an oil hole 1 - 1 which is communicated with the main oil tank on the inner side and communicated with the auxiliary oil tank on the outer side.

[0021] The tail terminal of the high-voltage bushing 9 is fixedly mounted on the outer wall plate 4 of the auxiliary oil tank through the connecting flange 8, and the inner end of the tail terminal is located inside the auxiliary oil tank. The inner end of the tail terminal is connected to a cable 10. The cable 10 passes through the oil hole 1-1 into the main oil tank and is connected to the transformer winding in the main oil tank.

[0022] Furthermore, a hand hole is provided on the auxiliary oil tank upper wall plate 2 , and a hand hole cover plate 7 is connected to the outer side of the hand hole via a hand hole flange 6 .

[0023] The cable 10 is the intermediate link between the transformer internal winding output and the external wiring. Its joint is formed by welding, and the lead wire is insulated and wrapped outside to prevent short circuit and poor contact. Therefore, the welding quality and insulation condition directly affect the occurrence of lead wire failure. Therefore, the connection operation between the high-voltage bushing 9 tail terminal and the cable 10 is very critical. The utility model is provided with a hand hole, through which the connection operation is carried out, and the hand hole is closed by the hand hole cover plate 7 after the operation is completed.

Claims

1. A high-voltage booster device for an oil-immersed transformer, comprising a main oil tank of the oil-immersed transformer, the main oil tank having a main oil tank side wall plate (1), and also comprising a high-voltage bushing (9) for mounting a high-voltage wire terminal of the oil-immersed transformer, characterized in that: The high-pressure lifting seat device also includes an auxiliary oil tank; the auxiliary oil tank includes an auxiliary oil tank outer wall plate (4) arranged outside the main oil tank side wall plate (1); the lower side of the auxiliary oil tank outer wall plate (4) is connected to the main oil tank side wall plate (1) via an auxiliary oil tank lower wall plate (5); the two side edges of the auxiliary oil tank outer wall plate (4) are respectively connected to the main oil tank side wall plate (1) via an auxiliary oil tank side wall plate (3); the upper side of the auxiliary oil tank outer wall plate (4) is connected to the main oil tank side wall plate (1) via an auxiliary oil tank upper wall plate (2); The main oil tank side wall plate (1) is provided with an oil through hole (1-1) whose inner side is in communication with the main oil tank and whose outer side is in communication with the auxiliary oil tank; the tail terminal of the high-voltage bushing (9) is fixedly mounted on the auxiliary oil tank outer wall plate (4) via a connecting flange (8), and the inner end of the tail terminal is located inside the auxiliary oil tank; the inner end of the tail terminal is connected to a cable (10), which passes through the oil through hole (1-1) into the main oil tank and is connected to a transformer winding in the main oil tank.

2. The high voltage booster device for oil-immersed transformers according to claim 1, characterized in that: The auxiliary oil tank upper wall plate (2) is provided with a hand hole, and the outer side of the hand hole is connected to a hand hole cover plate (7) via a hand hole flange (6).

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