A transformer core clamp grounding device

Abstract

This utility model provides a grounding device for transformer core clamps, comprising: a terminal fixedly connected to an insulating plate; at least one position knob electrically connected to the terminal, the position knob controlling the resistance value of a grounding resistor; and a copper busbar of the transformer core clamp electrically connected to the grounding resistor through the terminal. This utility model improves the safety and adaptability of grounding the transformer core clamps.

Description

Technical Field

[0001] This utility model relates to the field of transformer grounding technology, and in particular to a transformer core clamp grounding device. Background Technology

[0002] The core is the main component of a transformer that transmits and transforms electromagnetic energy. The core clamps are directly fixed to the core. Operating transformers require that the core and clamps be reliably grounded, and only at one point. If not grounded, since the core and clamps are within the electric field surrounding the windings, an induced voltage will be generated under the influence of an applied voltage. When this induced voltage exceeds the discharge voltage to ground, a discharge phenomenon will occur. This spark discharge will cause the transformer oil to decompose (producing gases such as acetylene), reducing the oil's insulation strength and potentially damaging solid insulation materials (such as pad insulation and clamp insulation), leading to more serious insulation faults. When the core and clamps are grounded at multiple points, a closed loop is formed, simultaneously connecting some magnetic flux. The induced electromotive force forms a circulating current, generating localized heating, accelerating insulation aging, and even burning out the core. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a grounding device for transformer core clamps. This grounding device for transformer core clamps can improve the safety and adaptability of grounding transformer core clamps.

[0004] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows: A transformer core clamp grounding device, comprising: Insulating board; Terminals fixedly connected to the insulating plate; At least one gear knob is electrically connected to the terminal block, the gear knob controls the resistance value of the grounding resistor, and the copper busbar of the transformer core clamp is electrically connected to the grounding resistor through the terminal block.

[0005] Optionally, the gear selector knob includes a first gear selector knob, a second gear selector knob, and a third gear selector knob arranged side by side, wherein the first gear selector knob, the second gear selector knob, and the third gear selector knob are connected in series.

[0006] Optionally, the first terminal of the first gear knob is electrically connected to the terminal block, the third terminal of the first gear knob is electrically connected to the first terminal of the second gear knob, the third terminal of the second gear knob is electrically connected to the first terminal of the third gear knob, and the third terminal of the third gear knob is electrically connected to the grounding rod.

[0007] Optionally, the transformer core clamp grounding device further includes: a control panel electrically connected to the first gear knob, the second gear knob, and the third gear knob, and displaying the status of the first gear knob, the second gear knob, and the third gear knob.

[0008] Optionally, the first gear knob, the second gear knob, and the third gear knob each include: resistance wire; The slider is slidably connected to the resistance wire; The third terminal is fixedly connected to the slider; The first terminal is fixedly connected to the first end of the resistance wire.

[0009] Optionally, the first gear knob, the second gear knob, and the third gear knob may further include a second terminal fixedly connected to the second end of the resistance wire.

[0010] Optionally, the terminal block is electrically connected to the grounding end of the clamp or the grounding end of the iron core, and the terminal block is electrically connected to the grounding rod.

[0011] Optionally, the grounding terminal of the clamp and the grounding terminal of the iron core are electrically connected to the transformer body terminal box.

[0012] Optionally, the transformer and the transformer oil bath are connected in a continuous manner.

[0013] Optionally, the resistance wire is made of a nickel-chromium alloy.

[0014] The above-described solution of this utility model uses an insulating plate; a terminal block fixedly connected to the insulating plate; and a stop knob electrically connected to the terminal block. The stop knob controls the resistance value of the grounding resistor, and the copper busbar of the transformer core clamp is electrically connected to the grounding resistor through the terminal block. This limits the grounding current of the transformer core clamp, prevents abnormal heating of the transformer core from causing abnormal gas generation in the equipment, and thus improves the safety and adaptability of the grounding of the transformer core clamp. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the transformer core clamp grounding device of this utility model; Figure 2 This is a schematic diagram of the stop knob of the transformer core clamp grounding device of this utility model; Figure 3 This is a connection diagram of the transformer core clamp grounding device of this utility model; Figure 4 This is an installation diagram of the transformer core clamp grounding device of this utility model.

[0016] Explanation of reference numerals in the attached figures: 1-Grounding resistor; 11-Insulation board; 12-Control panel; 13-Terminal; 1401-First position knob; 1402-Second position knob; 1403-Third position knob; 141-Resistance wire; 142-Slider; 143-First terminal; 144-Second terminal; 145-Third terminal; 2-Transformer; 21-Clamping grounding terminal; 22-Core grounding terminal; 23-Transformer body terminal box; 24-Oil sump; 25-Cable trench; 3-Grounding rod. Detailed Implementation

[0017] Exemplary embodiments of the present invention will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this invention will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0018] like Figure 1 As shown, an embodiment of this utility model provides a transformer core clamp grounding device, comprising: Insulating board 11; Terminal 13 is fixedly connected to the insulating plate 11; At least one gear knob is electrically connected to the terminal 13, the gear knob controls the resistance value of the grounding resistor, and the copper busbar of the transformer core clamp is electrically connected to the grounding resistor through the terminal 13.

[0019] In this embodiment, the transformer core clamp may experience multiple grounding points during operation, causing abnormal current in the core clamp and damaging the equipment. Therefore, it is necessary to add a grounding resistor to the grounding line of the transformer core clamp, such as... Figure 3 As shown; Figure 1 As shown, the grounding resistor is an adjustable resistor, including an insulating plate 11. A terminal 13 is fixedly installed on the insulating plate 11, and the transformer core clamp is electrically connected to the terminal 13 through a wire. A range knob electrically connected to the terminal 13 is fixedly installed on the insulating plate 11, and the resistance value of the grounding resistor can be adjusted by the range knob.

[0020] like Figure 1 As shown, in an optional embodiment of the present invention, the gear knob includes: a first gear knob 1401, a second gear knob 1402, and a third gear knob 1403 arranged side by side, wherein the first gear knob 1401, the second gear knob 1402, and the third gear knob 1403 are connected in series.

[0021] In this embodiment, as Figure 1As shown, in order to increase the available resistance value of the grounding resistance, three gear knobs are set, namely the first gear knob 1401, the second gear knob 1402, and the third gear knob 1403 connected in series.

[0022] In an optional embodiment of this utility model, the first terminal of the first gear knob 1401 is electrically connected to the terminal 13, the third terminal of the first gear knob 1401 is electrically connected to the first terminal of the second gear knob 1402, the third terminal of the second gear knob 1402 is electrically connected to the first terminal of the third gear knob 1403, and the third terminal of the third gear knob 1403 is electrically connected to the grounding rod 3.

[0023] In this embodiment, the three gear knobs are connected in series, and the three gear knobs together form an available ground resistance value, so as to increase the range and accuracy of resistance adjustment. Specifically, the first terminal of the first gear knob is electrically connected to the terminal 13, the third terminal of the first gear knob is electrically connected to the first terminal of the second gear knob, the third terminal of the second gear knob is electrically connected to the first terminal of the third gear knob, and the third terminal of the third gear knob is electrically connected to the grounding rod 3.

[0024] In an optional embodiment of this utility model, the transformer core clamp grounding device further includes a control panel 12 that is electrically connected to the first gear knob 1401, the second gear knob 1402, and the third gear knob 1403, and displays the status of the first gear knob 1401, the second gear knob 1402, and the third gear knob 1403.

[0025] In this embodiment, the transformer core clamp grounding device also includes a control panel 12 electrically connected to the gear knob. The control panel 12 is used to control the opening and closing of the grounding resistor, so that the grounding resistor can be easily controlled as needed. The control panel 12 is equipped with a display screen to display the working status of the grounding resistor and the resistance value during operation, so as to intuitively grasp the degree of adjustment of the grounding resistor.

[0026] like Figure 2 As shown, in an optional embodiment of the present invention, the first gear knob 1401, the second gear knob 1402, and the third gear knob 1403 each include: Resistance wire 141; The slider 142 is slidably connected to the resistance wire 141; The third terminal 145 is fixedly connected to the slider 142; The first terminal 143 is fixedly connected to the first end of the resistance wire 141.

[0027] In this embodiment, as Figure 2 As shown, a resistance wire 141 is provided in the gear knob; a slider 142 is provided on the resistance wire 141, the slider 142 keeps in contact with the resistance wire 141 and can slide within the layout range of the resistance wire 141 to adjust the effective working resistance value; a third terminal 145 is fixedly connected to the slider 142, and a first terminal 143 is fixedly connected to the first end of the resistance wire 141 to facilitate connecting the resistance wire into the working circuit.

[0028] like Figure 2 As shown, in an optional embodiment of the present invention, the first gear knob 1401, the second gear knob 1402, and the third gear knob 1403 further include a second terminal 144 fixedly connected to the second end of the resistance wire 141.

[0029] In this embodiment, as Figure 2 As shown, the gear knob is also provided with a second terminal 144 that is fixedly connected to the second end of the resistance wire 141. The second terminal 144 can be selectively connected to the circuit. When the first terminal 143 and the second terminal 144 are connected to the circuit at the same time, and the third terminal 145 is not connected to the circuit, the resistance value of the gear knob cannot be adjusted. At this time, the gear knob is used as a fixed resistance resistor.

[0030] like Figure 4 As shown, in an optional embodiment of the present invention, the terminal 13 is electrically connected to the grounding terminal 21 of the clamp or the grounding terminal 22 of the iron core, and the terminal 13 is electrically connected to the grounding rod 3.

[0031] In this embodiment, as Figure 4 As shown, terminal 13 is provided with multiple connection ports. The grounding terminal 21 of the transformer clamp or the grounding terminal 22 of the iron core is electrically connected to the grounding device 1 through terminal 13. At the same time, terminal 13 is electrically connected to the grounding rod 3, so that the transformer is connected to the grounding device 1 and the grounding rod 3, thereby realizing the grounding of the transformer.

[0032] like Figure 4 As shown, in an optional embodiment of the present invention, the clamp grounding terminal 21 and the iron core grounding terminal 22 are electrically connected to the transformer body terminal box 23.

[0033] In this embodiment, as Figure 4 As shown, a main body terminal box 23 is provided on the side of the transformer. The main body terminal box is a connection device that comes with the power transformer itself. It is mainly used for connecting the transformer's wiring, grounding and other work. The transformer main body terminal box 23 is electrically connected to the clamp grounding terminal 21 and the iron core grounding terminal 22, making the wiring of the clamp grounding terminal 21 and the iron core grounding terminal 22 more convenient and secure.

[0034] like Figure 4As shown, in an optional embodiment of the present invention, the transformer and the transformer oil tank 24 are connected in a through manner.

[0035] In this embodiment, as Figure 4 As shown, an oil sump 24 is provided on the side of the transformer, and the transformer and the transformer oil sump 24 are connected in a continuous manner. A cable trench 25 is provided on the side of the oil sump 24. The transformer oil sump can effectively prevent current leakage and ensure the safe operation of the transformer. Secondly, the transformer oil also plays a cooling role, helping the transformer to dissipate heat in time during operation and preventing the equipment from overheating and being damaged. Finally, it also has an arc extinguishing function, that is, it can quickly extinguish the arc when switching, protecting the transformer from damage.

[0036] In an optional embodiment of this utility model, the resistance wire 141 is made of nickel-chromium alloy.

[0037] In this invention, the resistance wire 141 is made of nickel-chromium alloy, which has high-temperature stability, making it suitable for long-term operation in high-temperature environments; it has moderate resistivity, effectively increasing resistance; and it has strong corrosion resistance, extending its service life in humid or chemical environments. The insulating plate 11 is made of epoxy resin board, which has good insulation and flame retardancy, high adhesion and mechanical strength, high density, low shrinkage, and high temperature resistance. The slider 142 is made of copper, which has good conductivity and robustness.

[0038] The present invention solves the problem of abnormal growth of grounding current in transformer core clamps by connecting a current-limiting grounding resistor in series on the grounding copper busbar of the transformer core clamp. By adjusting the resistance value of the current-limiting grounding resistor, the problem is solved. The solution is easy to implement on site, low in cost, and can effectively prevent excessive grounding current in transformer core clamps from causing equipment damage, thus achieving the technical effect of safe and stable operation of transformers.

[0039] The above description is the preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. A transformer core clamp grounding device, characterized by, include: Insulating board (11); Terminal (13) fixedly connected to the insulating plate (11); At least one gear knob is electrically connected to the terminal (13), the gear knob controls the resistance value of the grounding resistor, and the copper busbar of the transformer core clamp is electrically connected to the grounding resistor through the terminal (13).

2. The transformer core clamp grounding device of claim 1, wherein, The gear knob includes a first gear knob (1401), a second gear knob (1402), and a third gear knob (1403) arranged side by side, and the first gear knob (1401), the second gear knob (1402), and the third gear knob (1403) are connected in series.

3. The transformer core clamp grounding device of claim 2, wherein, The first terminal of the first gear knob (1401) is electrically connected to the terminal (13), the third terminal of the first gear knob (1401) is electrically connected to the first terminal of the second gear knob (1402), the third terminal of the second gear knob (1402) is electrically connected to the first terminal of the third gear knob (1403), and the third terminal of the third gear knob (1403) is electrically connected to the grounding rod (3).

4. The transformer core clamp grounding device of claim 2, wherein, Also includes: A control panel (12) is electrically connected to the first gear knob (1401), the second gear knob (1402), and the third gear knob (1403) and displays the status of the first gear knob (1401), the second gear knob (1402), and the third gear knob (1403).

5. The transformer core clamp grounding device of claim 2, wherein, The first gear knob (1401), the second gear knob (1402), and the third gear knob (1403) each include: Resistance wire (141); A slider (142) is slidably connected to the resistance wire (141). The third terminal (145) is fixedly connected to the slider (142). The first terminal (143) is fixedly connected to the first end of the resistance wire (141).

6. The transformer core clamp grounding device of claim 5, wherein, The first gear knob (1401), the second gear knob (1402), and the third gear knob (1403) further include a second terminal (144) that is fixedly connected to the second end of the resistance wire (141).

7. The transformer core clamp grounding apparatus of claim 3, wherein, The terminal block (13) is electrically connected to the clamp grounding terminal (21) or the iron core grounding terminal (22), and the terminal block (13) is electrically connected to the grounding rod (3).

8. The transformer core clamp grounding device of claim 7, wherein, The clamp grounding terminal (21) and the iron core grounding terminal (22) are electrically connected to the transformer body terminal box (23).

9. The transformer core clamp grounding apparatus of claim 1, wherein, The transformer is connected to the transformer oil tank (24).

10. The transformer core clamp grounding apparatus of claim 5, wherein, The resistance wire (141) is made of nickel-chromium alloy.

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