Oil-immersed current transformer

Abstract

The utility model discloses an oil-immersed current transformer which comprises a metal expander shell, an oil level window, a transformer body and a fixing bolt, the top of the transformer body is provided with the metal expander shell, and the fixing bolt is screwed between the metal expander shell and the transformer body. The metal expander shell and the mutual inductor body are mutually fixed through the fixing bolts, the oil level window is embedded in the front portion of the outer portion of the metal expander shell, the visual area of the oil level window is enlarged, and the oil level window is arranged to be in a rounded rectangle shape. According to the utility model, the oil level line is made of luminous paint and has a luminous reflection function at night or under the condition of dim light, and the red mark thickening metal expander top red mark line is arranged in the oil level line, so that the observation identification degree can be effectively increased, and an inspector can observe accurately and clearly; and meanwhile, the oil level window is made of explosion-proof glass instead of polycarbonate in the past, so that the transparency is better increased.

Description

Technical Field

[0001] The utility model relates to the technical field of current transformers, in particular to an oil-immersed current transformer. Background Art

[0002] Since oil-immersed current transformers are widely used in power grids, their safe and stable operation directly affects the safety of power grids. In recent years, there have been many oil-immersed current transformer failures and serious defects in substations, and the accidents caused are generally accompanied by explosions. The hazards of such accidents not only reduce the amount of power transmission, but also damage other adjacent equipment in the substation, posing a huge threat to the safety and reliability of power grid operation. Some studies have been conducted on the above issues. Traditional detection methods are manual inspections and inspections. Inspectors periodically use infrared, ultraviolet and oil level observation methods to observe and carry out power outage test methods such as dielectric loss, capacitance test and oil chromatography test. However, since oil-immersed current transformer failures develop very quickly, there are many problems with traditional inspections and test detections. The existing current transformers are affected by the oil level window structure and contamination, making the oil level indication unclear, resulting in the oil level losing its monitoring function for a long time, making it difficult to determine the operating status of the equipment, and operators are prone to misjudgment. Utility Model Content

[0003] The purpose of the utility model is to provide an oil-immersed current transformer to solve the problem that the existing current transformer proposed in the above background technology is affected by the oil level window structure and contamination, so that the oil level indication is unclear, resulting in the oil level losing its monitoring function for a long time, making it difficult to determine the operating status of the equipment, and the operating personnel are prone to misjudgment.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an oil-immersed current transformer, comprising a metal expander shell, an oil level window, a transformer body and fixing bolts, a metal expander shell is placed on the top of the transformer body, fixing bolts are screwed between the metal expander shell and the transformer body, the fixing bolts fix the metal expander shell and the transformer body to each other, an oil level window is inlaid on the front of the outside of the metal expander shell, the visible area of ​​the oil level window is enlarged, the shape of the oil level window is set to a rounded rectangle, the arrow indication on the outer cover of the oil level window is replaced with a bold oil level upper limit marking line and an oil level lower limit marking line, and the oil level upper limit marking line and the oil level lower limit marking line are both painted with luminous paint.

[0005] Preferably, the oil level window is made of explosion-proof glass, and the oil level window is made of a group of glass sheets with good gloss, which is characterized by light weight, good reflective performance, strong transparency, no discoloration, no rust and easy to make.

[0006] Preferably, the interior of the metal expander shell is firmly fixed to the metal expander shell by an aluminum alloy glass slide, and is coated with a 20mm oil level indicator line to form a red marking line on the top of the metal expander.

[0007] Preferably, a sealing strip is pressed around the upper cover of the transformer body, and the sealing strip is installed between the metal expander shell and the transformer body. The metal expander shell, the transformer body and the fixing bolts constitute a dustproof sealing structure.

[0008] Preferably, the oil level indicator in the metal expander housing is obtained by observing the red marking line on the top of the metal expander moving up and down with the oil level change, and the red indicator line is used to display the oil level.

[0009] Preferably, a pressure release needle is provided inside the metal expander shell, and a pressure release membrane is provided on the top of the mutual inductor body.

[0010] Compared with the prior art, the beneficial effects of the utility model are: the oil-immersed current transformer has a reasonable structure and has the following advantages:

[0011] (1) By changing the oil level window to a rounded rectangle, and replacing the upper and lower oil level marking lines with bold oil level lines, and using luminous paint, the oil level line has a luminous reflective function at night or in dim light. A red bold metal expander top red marking line is set inside, which can effectively increase the observation recognition and facilitate accurate and clear observation by patrol personnel. At the same time, the material of the oil level window is changed from polycarbonate to explosion-proof glass, which better increases transparency.

[0012] (2) Choose reasonable manufacturing materials and use glass slides with good gloss. The characteristics are light weight, good reflective performance, strong transparency, no discoloration, no rust and easy to make. At the same time, explosion-proof glass is not easy to wear and age, making the oil level window clearer. At the same time, a sealing strip is set to reduce dust from entering the interior of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a side view structural schematic diagram of the utility model;

[0014] Figure 2 This is a front view structural schematic diagram of the utility model;

[0015] In the figure: 1. Metal expander housing; 2. Oil level window; 3. Red marking line on the top of the metal expander; 4. Oil level upper limit marking line; 5. Oil level lower limit marking line; 6. Pressure release needle; 7. Pressure release membrane; 8. Transformer body; 9. Fixing bolts. DETAILED DESCRIPTION

[0016] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. All other embodiments obtained by ordinary technicians in the field without creative work based on the embodiments of the utility model shall fall within the scope of protection of the utility model.

[0017] See also Figure 1-2 The utility model provides an embodiment: an oil-immersed current transformer, characterized in that it includes a metal expander housing 1, an oil level window 2, a transformer body 8 and a fixing bolt 9, the metal expander housing 1 is placed on the top of the transformer body 8, the fixing bolt 9 is screwed between the metal expander housing 1 and the transformer body 8, the fixing bolt 9 fixes the metal expander housing 1 and the transformer body 8 to each other, the front part of the outside of the metal expander housing 1 is inlaid with an oil level window 2, the visible area of ​​the oil level window 2 is enlarged, the shape of the oil level window 2 is set to a rounded rectangle, the arrow indication on the outer cover of the oil level window 2 is replaced with a bold oil level upper limit marking line 4 and an oil level lower limit marking line 5, and the oil level upper limit marking line 4 and the oil level lower limit marking line 5 are both made of luminous paint;

[0018] The oil level line is painted with luminous paint, which has luminous reflection function at night or in dim light. A red marking line 3 on the top of the metal expander is set inside, which can effectively increase the observation recognition and facilitate the accurate and clear observation of the patrol personnel. At the same time, the material of the oil level window 2 is changed from the previous polycarbonate to explosion-proof glass, which better increases the transparency;

[0019] The oil level window 2 is made of explosion-proof glass. The oil level window 2 is made of a glass sheet with good gloss, which is characterized by light weight, good reflective performance, strong transparency, no discoloration, no rust and easy to make. The inside of the metal expander shell 1 is firmly fixed on the metal expander shell 1 through an aluminum alloy glass sheet, and is coated with a 20mm oil level indicator line to form a red marking line 3 on the top of the metal expander;

[0020] A sealing strip is pressed around the upper cover of the transformer body 8, and the sealing strip is installed between the metal expander housing 1 and the transformer body 8. The metal expander housing 1, the transformer body 8 and the fixing bolts 9 constitute a dustproof sealing structure;

[0021] The oil level indication in the metal expander housing 1 is to observe the red marking line 3 on the top of the metal expander moving up and down with the oil level change, and the red indicator line is used to display the oil level. A pressure release needle 6 is arranged inside the metal expander housing 1, and a pressure release membrane 7 is arranged on the top of the mutual inductor body 8;

[0022] Reasonable production materials are selected, and glass slides with good gloss are used, which are characterized by light weight, good reflective performance, strong transparency, no discoloration, no rust and easy to make. At the same time, explosion-proof glass is not easy to wear and age, making the oil level window 2 clearer. At the same time, a sealing strip is set to reduce dust from entering the device.

[0023] When the embodiment of the present application is in use, the device is installed in a suitable position, the oil level window 2 is changed to a rounded rectangle, and the oil level upper limit marking line 4 and the oil level lower limit marking line 5 are replaced with bold oil level lines, and the oil level line adopts luminous paint, which has a luminous reflection function at night or in dim light. A red-marked bold red marking line 3 on the top of the metal expander is provided inside, which can effectively increase the observation recognition and facilitate the accurate and clear observation of the patrol personnel. At the same time, the material of the oil level window 2 is changed from the previous polycarbonate to explosion-proof glass, which better increases the transparency, selects reasonable manufacturing materials, and uses glass slides with good gloss. It is characterized by light weight, good reflective performance, strong transparency, no discoloration, no rust and easy to make. At the same time, the explosion-proof glass is not easy to wear and age, so that the oil level window 2 is clearer, and a sealing strip is provided to reduce the entry of dust into the device.

[0024] Obviously, the embodiments described above are only some embodiments of the utility model, not all embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

Claims

1. An oil-immersed current transformer, characterized in that: The invention comprises a metal expander housing (1), an oil level window (2), a transformer body (8) and fixing bolts (9), wherein the metal expander housing (1) is placed on the top of the transformer body (8), a fixing bolt (9) is screwed between the metal expander housing (1) and the transformer body (8), and the fixing bolts (9) fix the metal expander housing (1) and the transformer body (8) to each other, and an oil level window (2) is inlaid on the front of the outside of the metal expander housing (1), the visible area of ​​the oil level window (2) is enlarged, the shape of the oil level window (2) is set to be a rounded rectangle, and the arrow indication on the outer cover of the oil level window (2) is replaced with a bold oil level upper limit marking line (4) and an oil level lower limit marking line (5), and the oil level upper limit marking line (4) and the oil level lower limit marking line (5) are both painted with luminous paint.

2. The oil-immersed current transformer according to claim 1, characterized in that: The oil level window (2) is made of explosion-proof glass. The oil level window (2) is made of a glass sheet with good gloss, and is characterized by light weight, good reflective performance, high transparency, no discoloration, no rust, and easy to manufacture.

3. The oil-immersed current transformer according to claim 1, characterized in that: The interior of the metal expander housing (1) is firmly fixed to the metal expander housing (1) via an aluminum alloy glass sheet, and is coated with a 20 mm oil level indicator line to form a red marking line (3) on the top of the metal expander.

4. The oil-immersed current transformer according to claim 1, characterized in that: A sealing strip is pressed around the upper cover of the transformer body (8), and the sealing strip is installed between the metal expander housing (1) and the transformer body (8). The metal expander housing (1), the transformer body (8) and the fixing bolts (9) form a dustproof sealing structure.

5. The oil-immersed current transformer according to claim 1, characterized in that: The oil level indicator in the metal expander housing (1) is obtained by observing the red marking line (3) on the top of the metal expander moving up and down as the oil level changes, and the red indicator line is used to display the oil level.

6. The oil-immersed current transformer according to claim 1, characterized in that: A pressure release needle (6) is arranged inside the metal expander housing (1), and a pressure release membrane (7) is arranged on the top of the mutual inductor body (8).

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