Oil-immersed power transformer iron core grounding mechanism

Abstract

The utility model relates to the technical field of transformer iron core grounding mechanisms, in particular to an oil-immersed power transformer iron core grounding mechanism which comprises a protective shell, a connecting outer ring is fixedly installed at the top end of the protective shell, a conductive column is fixedly installed on the connecting outer ring, and a grounding cutter bar is arranged on the conductive column. A grounding wire is fixedly installed at the bottom end of the conductive column and penetrates out of the protective shell, an inserting rod is fixedly installed at the end of the grounding wire, the grounding wire is fixedly installed in the inserting rod, a grounding end is fixedly installed at the tail end of the grounding wire and fixedly installed at the bottom end of the inserting rod, and an insulating holding rod is fixedly installed at the top end of the inserting rod. Scale marks are arranged on the surface of the inserting rod, a fixing ring is fixedly installed at the top end of the connecting outer ring, a limiting ring is fixedly installed at the top end of the protective shell, and the fixing ring and the limiting ring are fixedly connected through a plurality of fastening screws. The grounding device facilitates grounding operation and is convenient to use.

Description

Technical Field

[0001] The utility model relates to the technical field of transformer core grounding mechanisms, in particular to an oil-immersed power transformer core grounding mechanism. Background Art

[0002] Oil-immersed power transformers are one of the important equipment in the power supply and distribution systems of industrial and mining enterprises and civil buildings. Compared with traditional power transformers, oil-immersed power transformers can provide protection such as rust prevention by immersing the main components in the corresponding oil.

[0003] When a power transformer is in operation, a strong non-uniform electric field is formed between the live windings and leads and the oil tank. The iron core and components such as the metal structure that fixes the iron core are all in this strong non-uniform electric field. Due to the parasitic capacitance between the high-voltage winding, low-voltage winding, iron core, clamps, and oil tank, if the iron core is not grounded, the live winding will generate a certain potential to the ground through the coupling effect of the parasitic capacitance, which is the floating potential. The magnitude of this floating potential is related to the internal structure of the transformer. When the floating potential reaches a level that can break through its insulation gap, it will cause local intermittent micro-discharge between the iron core and the grounded oil tank. Under long-term action, it will cause insulation degradation and lead to transformer accidents.

[0004] To ensure the safe operation of transformers, it is usually necessary to install a corresponding core grounding mechanism on the transformer. There are many types of core grounding mechanisms on the market, but most of them have a fixed structure. During each grounding operation, the grounding position and depth are fixed due to component limitations. This has the disadvantage that the grounding point position and depth cannot be adjusted according to the actual soil conditions, causing inconvenience to the user. In view of this, we propose a core grounding mechanism for oil-immersed power transformers. Utility Model Content

[0005] The purpose of the utility model is to provide an oil-immersed power transformer core grounding mechanism to solve the defects mentioned in the above background technology.

[0006] To achieve the above purpose, the present invention provides the following technical solutions:

[0007] A grounding mechanism for the iron core of an oil-immersed power transformer comprises a protective shell, a connecting outer ring is fixedly mounted on the top of the protective shell, a conductive column is fixedly mounted on the connecting outer ring, a grounding knife rod is provided on the conductive column, a grounding wire is fixedly mounted on the bottom end of the conductive column, the grounding wire passes through the protective shell, a plug rod is fixedly mounted on the end of the grounding wire, the grounding wire is fixedly mounted inside the plug rod, a grounding terminal is fixedly mounted on the end of the grounding wire, the grounding terminal is fixedly mounted on the bottom end of the plug rod, an insulating holding rod is fixedly mounted on the top of the plug rod, and scale lines are provided on the surface of the plug rod along the height direction of the plug rod.

[0008] Preferably, a fixing ring is fixedly installed on the top end of the connecting outer ring, a limiting ring is fixedly installed on the top end of the protective shell, and the fixing ring and the limiting ring are fixedly connected by a plurality of fastening screws.

[0009] Preferably, a support is fixedly mounted on the top end of the conductive column, a lower end is fixedly mounted on the rear end of the grounding rod, and the lower end is rotatably connected to the support via a rotating shaft.

[0010] Preferably, an upper end is fixedly mounted on the front end of the grounding rod, and the upper end is fixedly connected to the transformer core.

[0011] Preferably, a shaft sleeve is fixedly mounted on the bottom end of the protective shell, a support rod is rotatably connected to the shaft sleeve, and a fixed base is fixedly mounted on the bottom end of the support rod.

[0012] Preferably, the connecting outer ring is plug-fitted to the protective shell, and the size of the connecting outer ring is adapted to the size of the protective shell.

[0013] Preferably, a rectangular rod is fixedly mounted on the end of the insulating gripping rod, and a triangular warning sign is provided on the rectangular rod.

[0014] Preferably, the cross-section of the triangular warning sign is triangular, and warning patterns are provided on the three sides of the triangular warning sign. A vertical rod is fixedly installed at the bottom of the triangular warning sign, and a fixing sleeve is fixedly installed at the bottom end of the vertical rod. The fixing sleeve is sleeved on the rectangular rod and fixedly connected to the rectangular rod by fastening screws.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] 1. The utility model is used for grounding operation through the provided grounding wire and grounding terminal. Since the grounding wire has a corresponding length, the insertion position of the plug-in rod into the soil layer can be adjusted within the length range of the grounding wire. The insertion depth of the plug-in rod can be adjusted by the provided scale line, thereby achieving the effect of reasonable grounding according to the specific conditions of the soil layer.

[0017] 2. The utility model has a grounding knife rod that can be connected to the core to perform grounding operations, and a triangular warning sign that is provided can serve as a warning, making it easy to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0019] Figure 2 This is a schematic diagram of the explosion structure of the utility model;

[0020] Figure 3 It is a partial structural diagram of the utility model;

[0021] The meaning of each number in the figure is:

[0022] 1. Grounding shank; 10. Upper end; 11. Lower end; 12. Support; 13. Conductive column; 14. Connecting outer ring; 141. Fixing ring;

[0023] 2. Protective housing; 20. Limiting ring; 21. Bushing; 22. Support rod; 23. Fixed base;

[0024] 3. Grounding wire; 30. Connecting rod; 301. Scale mark; 31. Grounding terminal; 32. Insulated holding rod; 33. Rectangular rod;

[0025] 4. Fixed sleeve; 40. Vertical pole; 41. Triangular warning sign; 42. Warning pattern. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0027] See also Figure 1-Figure 3The utility model provides a technical solution: a grounding mechanism for an oil-immersed power transformer core, comprising a protective shell 2, a connecting outer ring 14 fixedly mounted on the top of the protective shell 2, a conductive column 13 fixedly mounted on the connecting outer ring 14, a grounding knife rod 1 provided on the conductive column 13, a support 12 fixedly mounted on the top of the conductive column 13, a lower end head 11 fixedly mounted on the rear end of the grounding knife rod 1, the lower end head 11 and the support 12 are rotatably connected via a rotating shaft; an upper end head 10 fixedly mounted on the front end of the grounding knife rod 1, the upper end head 10 is fixedly connected to the transformer core for normal connection operation, and the grounding knife rod 1 can be rotated to achieve an angle-adjustable connection operation;

[0028] Specifically, a grounding wire 3 is fixedly installed at the bottom end of the conductive column 13, and the grounding wire 3 passes through the protective shell 2. A plug-in rod 30 is fixedly installed at the end of the grounding wire 3, and the grounding wire 3 is fixedly installed inside the plug-in rod 30. A grounding terminal 31 is fixedly installed at the end of the grounding wire 3, and the grounding terminal 31 is fixedly installed at the bottom end of the plug-in rod 30. The bottom outer diameter of the grounding terminal 31 is smaller than its top outer diameter, so that the grounding terminal 31 can be inserted into the ground for grounding operation; an insulating holding rod 32 is fixedly installed at the top end of the plug-in rod 30, and a scale line 301 is provided on the surface of the plug-in rod 30 along the height direction of the plug-in rod 30, so that the depth of the plug-in rod 30 to be inserted into the ground can be selected according to needs.

[0029] In this embodiment, a fixing ring 141 is fixedly installed on the top of the outer ring 14, and a limiting ring 20 is fixedly installed on the top of the protective shell 2. The fixing ring 141 and the limiting ring 20 are fixedly connected by multiple fastening screws to facilitate the fixed connection operation.

[0030] Specifically, a shaft sleeve 21 is fixedly installed at the bottom end of the protective shell 2, a support rod 22 is rotatably connected to the shaft sleeve 21, a fixed base 23 is fixedly installed at the bottom end of the support rod 22, and the fixed base 23 is fixedly installed on the external frame, so that the protective shell 2 can be rotated to achieve direction adjustment operation.

[0031] Furthermore, the connecting outer ring 14 is plugged into the protective shell 2, and the size of the connecting outer ring 14 is adapted to the size of the protective shell 2. The connecting outer ring 14 is used to seal the top of the protective shell 2 to reduce the entry of rainwater.

[0032] In addition, a rectangular rod 33 is fixedly installed at the end of the insulating holding rod 32, and a triangular warning sign 41 is provided on the rectangular rod 33; the cross-section of the triangular warning sign 41 is triangular, and warning patterns 42 are provided on the three sides of the triangular warning sign 41, and the triangular warning sign 41 is used for warning operations; a vertical rod 40 is fixedly installed at the bottom of the triangular warning sign 41, and a fixing sleeve 4 is fixedly installed at the bottom end of the vertical rod 40, and the fixing sleeve 4 is sleeved on the rectangular rod 33 and fixedly connected to the rectangular rod 33 by fastening screws, which facilitates the fixed installation operation of the triangular warning sign 41.

[0033] When the iron core grounding mechanism of the oil-immersed power transformer of the present invention is used, the fixed base 23 is first fixedly installed at the corresponding position, then the grounding knife rod 1 is rotated to a suitable position, and the grounding knife rod 1 is fixedly installed at the position where the grounding wire is required on the oil-immersed power transformer, and then the plug-in rod 30 is selected to select a suitable position and inserted into the soil to a suitable depth, so that the grounding terminal 31 is connected to the pre-arranged grounding system, and finally, the fixing sleeve 4 is fixedly installed on the vertical rod 40 using a fastening screw to complete the fixed installation operation.

[0034] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely preferred examples of the present invention and are not intended to limit the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and improvements fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A core grounding mechanism for an oil-immersed power transformer, comprising a protective housing (2), characterized in that: The top of the protective shell (2) is fixedly mounted with a connecting outer ring (14), the connecting outer ring (14) is fixedly mounted with a conductive column (13), the conductive column (13) is provided with a grounding knife rod (1), the bottom of the conductive column (13) is fixedly mounted with a grounding wire (3), the grounding wire (3) passes through the protective shell (2), the end of the grounding wire (3) is fixedly mounted with a plug rod (30), the grounding wire (3) is fixedly mounted inside the plug rod (30), the end of the grounding wire (3) is fixedly mounted with a grounding terminal (31), the grounding terminal (31) is fixedly mounted at the bottom of the plug rod (30), the top of the plug rod (30) is fixedly mounted with an insulating holding rod (32), and a scale line (301) arranged along the height direction of the plug rod (30) is provided on the surface of the plug rod (30).

2. The core grounding mechanism of an oil-immersed power transformer according to claim 1, characterized in that: A fixing ring (141) is fixedly mounted on the top of the connecting outer ring (14), and a limiting ring (20) is fixedly mounted on the top of the protective shell (2). The fixing ring (141) and the limiting ring (20) are fixedly connected via a plurality of fastening screws.

3. The core grounding mechanism of an oil-immersed power transformer according to claim 1, characterized in that: A support (12) is fixedly mounted on the top end of the conductive column (13), a lower end (11) is fixedly mounted on the rear end of the grounding shank (1), and the lower end (11) is rotatably connected to the support (12) via a rotating shaft.

4. The core grounding mechanism of an oil-immersed power transformer according to claim 3, characterized in that: An upper end head (10) is fixedly mounted on the front end portion of the grounding knife rod (1), and the upper end head (10) is fixedly connected to the transformer core.

5. The core grounding mechanism of an oil-immersed power transformer according to claim 1, characterized in that: A shaft sleeve (21) is fixedly mounted on the bottom end of the protective shell (2), a support rod (22) is rotatably connected to the shaft sleeve (21), and a fixed base (23) is fixedly mounted on the bottom end of the support rod (22).

6. The core grounding mechanism of an oil-immersed power transformer according to claim 1, characterized in that: The connecting outer ring (14) is plug-fitted to the protective shell (2), and the size of the connecting outer ring (14) is adapted to the size of the protective shell (2).

7. The core grounding mechanism of an oil-immersed power transformer according to claim 1, characterized in that: A rectangular rod (33) is fixedly mounted on the end of the insulating gripping rod (32), and a triangular warning sign (41) is provided on the rectangular rod (33).

8. The core grounding mechanism of an oil-immersed power transformer according to claim 7, characterized in that: The cross section of the triangular warning sign (41) is triangular, and warning patterns (42) are provided on the three sides of the triangular warning sign (41). A vertical rod (40) is fixedly installed at the bottom of the triangular warning sign (41), and a fixing sleeve (4) is fixedly installed at the bottom end of the vertical rod (40). The fixing sleeve (4) is sleeved on the rectangular rod (33) and is fixedly connected to the rectangular rod (33) by fastening screws.

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