Digital oil level indicator of transformer

Abstract

The utility model discloses a transformer digitization oil level gauge which comprises an outer shell, an operation panel arranged in a sealing mode is installed on the outer shell, a composite cable is installed on the side edge of the outer shell, a first sealing cavity and a second sealing cavity are formed in the outer shell, the first sealing cavity is a blind hole, and the second sealing cavity is a blind hole. A sliding block which is in sliding sealing is arranged in the first sealing cavity, the sliding block is connected with a connecting rod, and the tail end of the connecting rod abuts against the sliding rheostat. The transformer digital oil level indicator can be directly placed at the bottom of an oil-immersed transformer to be used, and therefore the transformer digital oil level indicator can be widely matched with an existing oil-immersed transformer, the improvement cost is reduced, and the transformer digital oil level indicator is suitable for popularization and application. The utility model has the advantages of simple operation and convenient use, can convert the oil level information inside the oil-immersed transformer into the voltage and current information of the circuit in real time and feed back the voltage and current information to the external control end, has the advantages of good real-time performance and high accuracy, and is simple in structure, low in cost and convenient to popularize and use.

Description

Technical Field

[0001] The utility model relates to the field of transformers, in particular to a digital oil level gauge for transformers. Background Art

[0002] Since humans discovered electricity, how to regulate the energy level of electricity has been a difficult problem, so people invented transformers. Transformers are devices that use the principle of electromagnetic induction to change AC voltage. The main components are primary coils, secondary coils and iron cores (magnetic cores). They play the role of voltage conversion, current conversion, impedance conversion, isolation, and voltage stabilization (magnetic saturation transformer) in the circuit. Transformers are basic equipment for power transmission and distribution, and are widely used in industries, agriculture, transportation, urban communities and other fields. If the power network is the blood vessel of human society, then the transformer is the nerve that controls the contraction of blood vessels. Its importance is self-evident. The oil-immersed transformer is a transformer that uses transformer oil as an insulating and cooling medium. Compared with traditional transformers, oil-immersed transformers have the advantages of light weight, good heat dissipation, and good moisture resistance, so they have been widely used.

[0003] After long-term use, the transformer oil inside the oil-immersed transformer will produce certain losses. The lowered oil level inside the transformer will not only affect the heat dissipation effect of the oil-immersed transformer, but also affect the insulation performance of the oil-immersed transformer, causing certain safety hazards. However, due to the complex internal structure and numerous pipelines of the transformer, traditional oil level gauges are difficult to use inside oil-immersed transformers. Summary of the invention

[0004] The utility model aims to provide a transformer digital oil level gauge to solve the problem in the background art that the existing oil level gauge is difficult to be installed inside an oil-immersed transformer with a complex structure and numerous pipelines.

[0005] The technical solution of the utility model is implemented as follows: a transformer digital oil level gauge comprises an outer shell, a sealed operation panel is installed on the shell of the outer shell, a composite cable is installed on the side of the outer shell, a sealed cavity one and a sealed cavity two are arranged inside the outer shell, the sealed cavity one is a blind hole, a sliding block with a sliding seal is arranged inside the sealed cavity one, the slider is connected to a connecting rod, the end of the connecting rod abuts against a sliding rheostat, the connecting rod and the sliding rheostat are both electrically connected to a circuit protection circuit arranged in the sealed cavity two, the circuit protection circuit is electrically connected to a pressure-current detection chip, the pressure-current detection chip is electrically connected to a single-chip microcomputer, and the single-chip microcomputer is electrically connected to the operation panel and the composite cable respectively.

[0006] Preferably, an end protection sleeve is provided between the outer shell and the composite cable, and the end protection sleeve is a corrugated tube sleeve.

[0007] Preferably, the outer shell has a trapezoidal structure that is narrow at the top and wide at the bottom.

[0008] Preferably, a magnetic sheet is embedded in the bottom of the outer shell.

[0009] Preferably, the operation panel includes a display screen, an indicator light is arranged on the side of the display screen, and a switch button is arranged below the indicator light.

[0010] Preferably, the sealed cavity is filled with insulating gas.

[0011] Preferably, the sliding block is sealingly and slidably connected to the sealing cavity, and the inner wall of the sealing cavity is polished.

[0012] By adopting the above technical solution, the beneficial effects of the utility model are as follows:

[0013] This type of transformer digital oil level gauge can be directly placed at the bottom of the oil-immersed transformer for use, so it is widely compatible with existing oil-immersed transformers, reduces transformation costs, is simple to operate and easy to use, and can convert the oil level information inside the oil-immersed transformer into voltage and current information of the circuit in real time, and feed it back to the external control terminal. It has the advantages of good real-time performance and high accuracy. At the same time, the utility model has a simple structure and low cost, and is easy to promote and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0015] Figure 1 It is the front view of the utility model.

[0016] Figure 2 It is a left view of the utility model.

[0017] Figure 3 This is a view of the internal structure of the present utility model.

[0018] Figure 4 It is an enlarged view of the operation panel of the utility model.

[0019] Among them: 1. outer shell; 2. operation panel; 3. composite cable; 4. sealed cavity one; 5. sealed cavity two; 6. slider; 7. connecting rod; 8. sliding rheostat; 9. circuit protection circuit; 10. pressure and current detection chip; 11. single-chip microcomputer; 12. magnetic sheet; 13. end protection cover; 14. insulating gas; 201. display screen; 202. indicator light; 203. switch button. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] See also Figure 1-Figure 3 A digital oil level gauge for a transformer comprises an outer shell 1, an operating panel 2 with a sealing arrangement is installed on the shell of the outer shell 1, a composite cable 3 is installed on the side of the outer shell 1, a sealed cavity 1 4 and a sealed cavity 2 5 are arranged inside the outer shell 1, the sealed cavity 1 4 is a blind hole, a sliding block 6 with a sliding seal is arranged inside the sealed cavity 1 4, the sliding block 6 is connected to a connecting rod 7, the end of the connecting rod 7 abuts against a sliding rheostat 8, the connecting rod 7 and the sliding rheostat 8 are both electrically connected to a circuit protection circuit 9 arranged in the sealed cavity 2 5, the circuit protection circuit 9 is electrically connected to a pressure-current detection chip 10, the pressure-current detection chip 10 is electrically connected to a single-chip microcomputer 11, and the single-chip microcomputer 11 is electrically connected to the operating panel 2 and the composite cable 3 respectively.

[0022] See also Figure 1 and Figure 3 An end protection sleeve 13 is arranged between the outer shell 1 and the composite cable 3. The end protection sleeve 13 is a corrugated tube sleeve. Since the internal environment of the oil-immersed transformer is relatively complex, it is sometimes necessary to bend the composite cable 3 when installing the device. This arrangement can provide bending protection for the composite cable 3 through the end protection sleeve 13, avoid breaking of the composite cable 3, and thus increase the service life of the composite cable 3.

[0023] See also Figure 2 The outer shell 1 is a trapezoidal structure that is narrow at the top and wide at the bottom. This arrangement can lower the center of gravity of the device, improve the stability of the device, and ensure the stability of the device during operation.

[0024] See also Figure 3 A magnetic sheet 12 is embedded in the bottom of the outer shell 1. This arrangement allows the magnetic sheet 12 to be used to fix the device at the bottom of the inner cavity of the oil-immersed transformer, further ensuring the stability of the device.

[0025] See also Figure 4 The operation panel 2 includes a display screen 201, an indicator light 202 is arranged on the side of the display screen 201, and a switch button 203 is arranged below the indicator light 202. This arrangement is convenient for the staff to manually control the opening and closing of the device through the switch button 203. At the same time, the display screen 201 can display the detection data of the device in real time, which is convenient for the staff to view.

[0026] Referring to FIG. 3 , the sealed cavity 4 is filled with insulating gas 14 . This arrangement can utilize the insulating gas 14 to further improve the insulation performance in the sealed cavity 4 , and can also provide a reset function for the slider 6 .

[0027] Referring to 3, the slider 6 is sealed and slidably connected to the sealing cavity 4, and the inner wall of the sealing cavity 4 is polished. This arrangement can improve the sealing performance and prevent the transformer oil from entering the sealing cavity 4.

[0028] Working principle: When using this device, first electrically connect the composite cable 3 to the external control end, so that the composite cable 3 is used to power the device. At the same time, the information collected by the device is fed back to the external control end through the composite cable 3. The device is placed at the bottom of the oil-immersed transformer. The hydraulic pressure of the transformer oil directly acts on the side of the slider 6. The hydraulic pressure pushes the slider 6 to shrink into the sealed cavity 4, so that the slider 6 pushes the end of the connecting rod 7 to slide to a certain position on the sliding rheostat 8. After the placement is completed, operate the operation panel 2 to start the device. The composite cable 3 inputs the power of the external control end into the device, passes through the circuit protection loop 9, and is clamped at both ends of the sliding rheostat 8. Part of the resistance on the sliding rheostat 8 is connected to the circuit, and the pressure-current detection chip is used. 10 detects the voltage and current information of the circuit of the device, and feeds it back to the single-chip microcomputer 11 for processing, and at the same time feeds it back to the external control end via the composite cable 3. When the transformer oil inside the oil-immersed transformer is lost, the height of the transformer oil is reduced, and the hydraulic strength generated on the side of the slider 6 is reduced. At this time, the gas in the sealed cavity 4 pushes the slider 6 to move outward, and the end of the connecting rod 7 slides on the sliding rheostat 8, changing the resistance of the sliding rheostat 8 connected to the circuit of the device, so that the voltage and current detected by the pressure-current detection chip 10 change. After the change information is processed by the single-chip microcomputer 11, it is displayed on the operation panel 2, and at the same time, it is fed back to the external control end via the composite cable 3, so that people can conveniently observe the oil level change information at any time and maintain the oil-immersed transformer in time.

[0029] In the description of this specification, the terms "connect", "install", "fix", "set", etc. are all understood in a broad sense. For example, "connection" can be a fixed connection or an indirect connection through an intermediate component without affecting the relationship between components and the technical effect, or it can be an integral connection or a partial connection. As in this case, for ordinary technicians in the field, the specific meanings of the above terms in the utility model or the utility model can be understood according to the specific circumstances. In the utility model, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inside", "outside", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings. These terms are mainly for better describing the utility model and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation. Finally, it should be noted that when describing the position of each component and the matching relationship between them, the utility model usually takes one / a pair of components as an example, but it should be understood by those skilled in the art that such positions, matching relationships, etc. are also applicable to other components / other paired components.

[0030] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A digital oil level gauge for a transformer, characterized in that: The invention comprises an outer shell (1), on which an operating panel (2) is installed in a sealed manner, a composite cable (3) is installed on the side of the outer shell (1), a sealed cavity (4) and a sealed cavity (5) are arranged inside the outer shell (1), the sealed cavity (4) is a blind hole, a sliding block (6) with a sliding seal is arranged inside the sealed cavity (4), the sliding block (6) is connected to a connecting rod (7), the end of the connecting rod (7) abuts against a sliding rheostat (8), the connecting rod (7) and the sliding rheostat (8) are both electrically connected to a circuit protection circuit (9) arranged in the sealed cavity (5), the circuit protection circuit (9) is electrically connected to a pressure-current detection chip (10), the pressure-current detection chip (10) is electrically connected to a single-chip microcomputer (11), and the single-chip microcomputer (11) is electrically connected to the operating panel (2) and the composite cable (3), respectively.

2. A transformer digital oil level gauge according to claim 1, characterized in that: An end protection sleeve (13) is provided between the outer shell (1) and the composite cable (3), and the end protection sleeve (13) is a corrugated tube sleeve.

3. The digital oil level gauge for transformer according to claim 1, characterized in that: The outer shell (1) has a trapezoidal structure that is narrow at the top and wide at the bottom.

4. The digital oil level gauge for transformer according to claim 1, characterized in that: A magnetic attraction sheet (12) is embedded in the bottom of the outer shell (1).

5. The digital oil level gauge for transformer according to claim 1, characterized in that: The operation panel (2) comprises a display screen (201), an indicator light (202) is arranged on the side of the display screen (201), and a switch button (203) is arranged below the indicator light (202).

6. The digital oil level gauge for transformer according to claim 1, characterized in that: The sealed cavity one (4) is filled with insulating gas (14).

7. The digital oil level gauge for transformer according to claim 1, characterized in that: The sliding block (6) is sealingly and slidably connected to the sealing cavity one (4), and the inner wall of the sealing cavity one (4) is polished.

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