Wireless oil state monitoring device for low-oil power equipment

Abstract

The invention provides a wireless oil state monitoring device for low-oil power equipment. According to the monitoring device, an opening is formed in the bottom end of a protective shell; the sensor base is detachably arranged at the open end of the protective shell, and a protective cavity is defined between the sensor base and the protective shell; the monitoring assembly is arranged on the side, opposite to the protective shell, of the sensor base, and one end of the monitoring assembly is arranged on the sensor base. The internal PCB is protected through the protective shell and the sensor base, and the external monitoring assembly is inserted into the low-oil power equipment, so that data acquisition is carried out on the state of an oil region or a gas region in the low-oil power equipment, and then data processing is carried out through the PCB; key parameters of a top oil region of the low-oil power equipment are monitored, and oil gas in operation of the low-oil power equipment without an oil taking port in the middle or with a narrow oil taking port is monitored.

Description

Technical Field

[0001] The present invention relates to the technical field of oil status monitoring for electric power equipment, and in particular to a wireless oil status monitoring device for oil-scarce electric power equipment. Background Art

[0002] Oil-paper insulated bushings, mutual inductors, coupling capacitors and other oil-free equipment are insulated by filling insulating oil. Such equipment is affected by multiple factors such as heat during operation and has harsh operating conditions. Once internal gas production occurs, it develops rapidly and can easily cause equipment failure, and even explosion in severe cases. It is necessary to monitor the oil status of oil-free equipment in real time to detect potential faults in a timely manner and ensure safe and stable operation of the equipment.

[0003] At present, there are oil status monitoring devices installed at the oil extraction port in the middle of the equipment, and the parameters such as H2 and pressure in the oil are monitored by wired means. However, there is a certain proportion of oil-less equipment with no oil extraction port in the middle or a narrow oil extraction port. To realize gas production monitoring during the operation of such equipment, sensors can be installed at the external holes on the high-voltage side of the equipment to monitor the status of the top oil or gas domain. When the equipment is overheated or insulation failure occurs, hydrogen is produced in the oil, and the oil status parameters can be sensed in the upper oil domain. At the same time, small molecules overflow after the discharge in the oil produces gas and reach the upper air cavity, and the pressure of the upper air cavity changes accordingly. Installing a sensor device on the top of the equipment can also monitor its operation. The top of the equipment is a high-voltage and strong magnetic field area, which has strong electromagnetic interference and high structural design requirements for the sensor. In addition, it is impossible to carry out cable lead-down on the high-voltage side, and a wireless structure must be used. At present, no relevant technical research has been carried out at home and abroad on the design of wireless sensor devices suitable for strong electromagnetic field areas, and there is no effective monitoring device product that meets engineering applications. Summary of the invention

[0004] In view of this, the present invention proposes a wireless oil status monitoring device for oil-poor power equipment, aiming to solve the problem that the existing oil-poor equipment has no oil intake port in the middle or the oil intake port is narrow, resulting in difficulty in monitoring.

[0005] The present invention proposes a wireless oil status monitoring device for low-oil power equipment, which includes: a protective shell having an opening at its bottom end; a sensor base, which is detachably arranged at the open end of the protective shell, and a protective cavity is formed between the sensor base and the protective shell; a monitoring component, which is arranged on a side of the sensor base facing away from the protective shell, and has one end arranged on the sensor base and the other end used to extend to the interior of the low-oil power equipment to collect data on the oil domain or gas domain status in the low-oil power equipment; a PCB board, which is arranged in the protective cavity and connected to the sensor.

[0006] Furthermore, in the above-mentioned wireless oil status monitoring device for low-oil power equipment, the monitoring component includes: a monitoring probe, which is placed on one side of the sensor base, the connecting end of the monitoring probe is arranged on the sensor base, and the connecting end is used to extend to the interior of the low-oil power equipment to communicate with the low-oil power equipment; a sealing joint, which is arranged inside the monitoring probe, and the sealing joint divides the monitoring probe into a monitoring area and a sealing protection area that are independent of each other, and the sealing joint corresponds to the connecting end and the connecting end of the monitoring probe, respectively, so as to seal the sealing protection area of ​​the monitoring probe; a sensor, which is arranged inside the monitoring area, and is used to collect data on the status of the oil domain or gas domain in the low-oil power equipment.

[0007] Furthermore, in the above-mentioned wireless oil status monitoring device for oil-poor power equipment, the sensor is one or any combination of hydrogen sensors, temperature and pressure sensors, and humidity / micro-water sensors.

[0008] Furthermore, in the above-mentioned wireless oil status monitoring device for oil-poor electrical equipment, a flexible guide belt is provided in the monitoring area of ​​the monitoring probe rod for supporting the sensor.

[0009] Furthermore, in the above-mentioned wireless oil status monitoring device for oil-less electrical equipment, a lateral connecting hole connected to the monitoring area is provided on the side wall of the monitoring probe rod; the connecting end and the connecting end of the monitoring probe rod are both opened, and the connecting end of the monitoring probe rod is provided with a cap for bottom sealing.

[0010] Furthermore, in the above-mentioned wireless oil status monitoring device for oil-poor electrical equipment, a shielding plate is provided on the sensor base, a shielding cavity is formed between the shielding plate and the sensor base, and the PCB board is arranged in the shielding cavity.

[0011] Furthermore, in the above-mentioned wireless oil status monitoring device for oil-poor electrical equipment, there are gaps between the PCB board and the sensor base and the shielding plate respectively.

[0012] Furthermore, in the above-mentioned wireless oil status monitoring device for oil-poor electrical equipment, support columns are respectively provided between the PCB board and the sensor base and the shielding plate for supporting the PCB board and the shielding plate.

[0013] Furthermore, in the above-mentioned wireless oil status monitoring device for oil-poor electrical equipment, a power supply module is also provided in the protective cavity for powering the PCB board; an antenna is provided on the PCB board, which passes through the shielding plate and extends to the side of the shielding plate facing away from the sensor base.

[0014] Furthermore, in the above-mentioned wireless oil status monitoring device for oil-poor electrical equipment, the protective shell is an ABS type plastic shell; and a sealing ring is provided between the protective shell and the sensor base.

[0015] The wireless oil status monitoring device for oil-poor power equipment provided by the present invention protects the internal PCB board through a protective shell and a sensor base, and is inserted into the interior of the oil-poor power equipment through an external monitoring component to collect data on the state of the oil field or gas field in the oil-poor power equipment, and then processes the data through the PCB board to monitor the key parameters of the top oil field of the oil-poor power equipment, and realize the monitoring of oil and gas in the operation of the oil-poor power equipment without an oil extraction port in the middle or with a narrow oil extraction port, especially installing the device at the external hole position on the high-voltage side of the equipment to monitor the gas state of the top oil field, and realize the monitoring of the key parameters of all points of the oil-poor power equipment, so that the equipment has an oil status monitoring means, and can ensure the safe and stable operation of the equipment, and solve the problem that the existing oil-poor equipment has no oil extraction port in the middle or has a narrow oil extraction port, which leads to difficulty in monitoring. In addition, the device has a compact structure to avoid interference with the installation and use of other components.

[0016] Furthermore, the threshold values ​​of monitoring parameters can also be determined, so that the oil-poor equipment in the middle that does not have the conditions for oil status monitoring can have monitoring means. Research on wireless hydrogen, temperature, pressure and humidity sensing technology that is resistant to electromagnetic interference and does not require an external power supply has been carried out. The wireless oil status monitoring device for oil-poor power equipment has the characteristics of low power consumption, strong signal and resistance to electromagnetic interference, and can realize key parameter monitoring of the top oil field of oil-poor equipment. At the same time, the device can perform wireless monitoring without an external power supply, which is convenient for the use and installation of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings: Figure 1 A schematic diagram of the structure of a wireless oil status monitoring device for oil-poor power equipment provided by an embodiment of the present invention; Figure 2 A schematic diagram of the structure of a low-oil power equipment provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0018] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to be able to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that, in the absence of conflict, the embodiments of the present invention and the features described in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0019] See also Figure 1 , which is a schematic diagram of the structure of a wireless oil status monitoring device for oil-poor power equipment provided by an embodiment of the present invention. As shown in the figure, the monitoring device 100 includes: a protective housing 1, a sensor base 2, a monitoring component 3 and a PCB board 4; wherein, The bottom end of the protective shell 1 has an opening to facilitate the disassembly and assembly of the internal components. Specifically, the protective shell 1 can be a plastic shell to ensure that the wireless communication is not shielded and has a certain hardness for protection. In this embodiment, the protective shell 1 is made of ABS plastic, that is, the protective shell 1 is an ABS plastic shell.

[0020] The sensor base 2 is detachably arranged at the open end of the protective shell 1, and a protective cavity is formed between the sensor base 2 and the protective shell 1. Specifically, the sensor base 2 is adapted to the opening of the protective shell 1, and is installed at the open end of the protective shell 1 to seal the open end of the protective shell 1. The two are arranged to form a protective cavity, so that the PCB board 4 can be sealed in the protective cavity. In this embodiment, the sensor base 2 and the protective shell 1 may be provided with a sealing ring 5 for sealing the gap between the two, thereby further ensuring the sealing of the protective cavity. Among them, the sealing ring 5 may be an O-ring.

[0021] The monitoring component 3 is arranged on the side of the sensor base 2 facing away from the protective housing 1 (eg Figure 1 right side shown), and one end (as Figure 1 The left end shown in FIG. 1 is arranged on the sensor base 2, and the other end (as shown in FIG. Figure 1 The monitoring component 3 is arranged outside the protective cavity, and the fixed end of the monitoring component 3 (such as the right end shown in the figure) is used to extend into the interior of the oil-poor power equipment to collect data on the state of the oil or gas domain in the oil-poor power equipment. Figure 1The left end of the monitoring component 3 is fixedly connected to the sensor base 2, and the other end can extend from the top hole of the oil-less power equipment to at least the inside of the oil-less power equipment to collect data on the state of the oil or gas domain in the oil-less power equipment, for example, data can be collected for one or more combinations of parameters such as hydrogen content, temperature and pressure, humidity / micro-water, etc., to achieve monitoring of the monitoring device 100. In this embodiment, the fixed end of the monitoring component 3 and the sensor base 2 can be connected through an installation adapter, wherein the monitoring component 3 and the installation adapter can be connected to form an integral structure and installed on the sensor base 2 as a whole.

[0022] The PCB board 4 is arranged in the protective cavity, and is connected to the monitoring component 3, and is used to process the data collected by the monitoring component 3, so as to realize the monitoring of the oil domain or gas domain status in the oil-less power equipment. Specifically, the PCB board 4 is arranged in the protective cavity, and is connected to the monitoring component 3, and the two can be connected by a cable 31 to realize signal transmission between the two, and then the data collected by the monitoring component 3 is processed by the PCB board 4. In this embodiment, the PCB board 4 can be a wireless PCB board, that is, the signal can be transmitted to the terminal by wireless transmission.

[0023] In the present embodiment, a wireless communication module, a power module, and a data processing module may be installed on the PCB board 4. The PCB board 4 is a main component susceptible to strong electromagnetic interference and must be completely shielded while ensuring its normal operation. In order to avoid electromagnetic interference of interference signals on the PCB board 4, preferably, a shielding plate 21 is provided on the sensor base 2. A shielding cavity is formed between the shielding plate 21 and the sensor base 2. The PCB board 4 is arranged in the shielding cavity to perform electromagnetic shielding through the shielding plate 21 and the sensor base 2. Specifically, the sensor base 2 is a seat structure with an open end and a hollow interior. The open end of the protective housing 1 is closed by a closed end. The PCB board 4 is embedded in the sensor base 2. The sensor base 2 is made of 316L steel, which can well achieve electromagnetic shielding of the lower end face of the PCB board 4. The side of the PCB board 4 facing away from the sensor base 2 (such as Figure 1The left side of the sensor base 2 is also provided with a shielding plate 21, which is made of 316L steel and performs electromagnetic shielding on the upper end surface of the PCB board 4. In this embodiment, in order to avoid damage to components on the PCB board 4 or short circuit of components, preferably, there are gaps between the PCB board 4 and the sensor base 2 and the shielding plate 21, respectively, so as to avoid damage to the PCB board 4 by the sensor base 2 and the shielding plate 21. Among them, there are support columns 22 between the PCB board 4 and the sensor base 2 and the shielding plate 21, respectively, for supporting the PCB board 4 and the shielding plate 21, that is, the bottom plate of the sensor base 2 is provided with a support column 22, and the PCB board 4 is supported on the support column 22 on the bottom plate of the sensor base 2, and the upper side of the PCB board 4 is also provided with a support column 22, and the shielding plate 21 is supported on the support column 22 on the upper side of the PCB board 4, thereby ensuring that there are gaps between the PCB board 4 and the sensor base 2 and the shielding plate 21; of course, the PCB board 4 and the shielding plate 21 can also be connected to the support column 22 to achieve position fixation. The support column 22 may be a copper stud or other support columns, which is not limited in this embodiment.

[0024] In this embodiment, the PCB board 4 may be connected to an antenna 41 to achieve wireless transmission. Of course, wireless transmission may also be achieved by other means, which are not limited in this embodiment. To ensure that the antenna 41 achieves wireless transmission, preferably, the antenna 41 may pass through the shielding plate 21 or through the gap between the shielding plate 21 and the sensor base 2, and extend to the outside of the shielding cavity, that is, to the upper side of the shielding plate 21 (such as Figure 1 left side shown).

[0025] Continue to see Figure 1 A power supply module 6 is also provided in the protective cavity for supplying power to the PCB board 4. Specifically, the power supply module 6 can be clamped on the sensor base 2 by a fixing clip 7 to fix the power supply module 6. The fixing clip 7 is two butt-jointed arc-shaped clips, one end of which can be fixed on the shielding plate 21, and the other ends are connected by connecting bolts to clamp the power supply module 6 between the two arc-shaped clips to ensure the fixation of the power supply module 6; the fixing clip 7 and the shielding plate 21 can be an integral structure, or can be connected and fixed by other means, which is not limited in this embodiment. In this embodiment, the power supply module 6 can be a low-power power supply battery, a solar power supply module or an induction power module.

[0026] Continue to see Figure 1 The monitoring assembly 3 includes: a monitoring probe rod 32, a sensor 33 and a sealing joint 34; wherein the monitoring probe rod 32 is placed on one side of the sensor base 2 (such as Figure 1 As shown on the right side), the connection end of the monitoring probe 32 (such as Figure 1 The left end shown in FIG. 1 is arranged on the sensor base 2, and the connecting end (as shown in FIG. Figure 1 The right end as shown in the figure is used to extend to the interior of the oil-less power equipment to communicate with the oil-less power equipment; the sealing joint 34 is arranged inside the monitoring probe 32, and the sealing joint 34 divides the monitoring probe 32 into a monitoring area and a sealing protection area which are independent of each other, and they respectively correspond to the connecting end and the connecting end of the monitoring probe 32 to seal the sealing protection area of ​​the monitoring probe 32; the sensor 33 is arranged inside the monitoring area, and is used to collect data on the status of the oil domain or gas domain in the oil-less power equipment.

[0027] Specifically, the monitoring probe 32 is a rod-shaped structure with two ends open and a hollow interior, and can be made of 316L steel. The connecting end of the monitoring probe 32 can be inserted and fixed on the sensor base 2, so that the cable 31 inside the monitoring probe 32 can extend from the connecting end to the shielding cavity in the sensor base 2 and connect to the PCB board 4. A sealing joint 34 is provided inside the monitoring probe 32 to divide the interior of the monitoring probe 32 into two independent areas, namely the monitoring area and the sealing protection area, which correspond to the connecting end and the connecting end of the monitoring probe 32, respectively. That is to say, the monitoring area is connected to the oil-less power equipment, and the sealing protection area is sealed and isolated from the monitoring area by the sealing joint 34. The sealing protection area of ​​the monitoring probe 32 is sealed by the sealing joint 34, thereby preventing the gas or oil in the oil-less power equipment from entering the sealing protection area and the protection cavity, thereby achieving the sealing of the oil layer. The sensor 33 is arranged in the monitoring area, and the side wall of the monitoring probe 32 is provided with a lateral connecting hole 321 connected to the monitoring area. The gas or oil in the oil-less power equipment enters the monitoring area from the connecting hole 321, and then the data of the oil domain or gas domain state in the oil-less power equipment is collected through the sensor 33 in the monitoring area. In this embodiment, the sensor 33 can be one or any combination of a hydrogen sensor, a temperature and pressure sensor, and a humidity / micro-water sensor. In this embodiment, a cap 35 is provided at the connecting end of the monitoring probe 32 for bottom sealing, which can protect the sensor 33. The monitoring probe 32 can be inserted as a whole into at least the oil-less power equipment, and the top is sealed by a sealing joint 34. Among them, the monitoring probe 32 and the mounting adapter can be connected as an integral structure, and the entire structure is installed on the sensor base 2.

[0028] Continue to see Figure 1, a flexible guide belt 36 is provided in the monitoring area of ​​the monitoring probe 32 to support the sensor 33. Specifically, the flexible guide belt 36 can be connected to the inner wall of the monitoring probe 32 through a support plate 37. For example, the support plate 37 is supported and fixed on the inner wall of the monitoring probe 32. Both ends of the flexible guide belt 36 can be fixedly mounted on the support plate 37 to support and fix the flexible guide belt 36 through the support plate 37. The sensor 33 can be fixed to the flexible guide belt 36 by bonding, or by other methods. Of course, the flexible guide belt 36 can also be fixedly mounted on the sealing joint 34. In this embodiment, there is no limitation on the fixing method of the flexible guide belt 36.

[0029] See also Figure 2 , which is a schematic diagram of the structure of the transformer bushing provided in an embodiment of the present invention. As shown in the figure, the transformer bushing 200 may be provided with an oil filling port 201, and the wireless oil status monitoring device for oil-poor power equipment is installed at the oil filling port 201 in a detachable manner. The transformer bushing 200 may be a ±66kV oil-immersed transformer bushing, or other bushings, and is not limited in this embodiment. The middle flange of this type of bushing does not have an oil extraction port, and the top of the bushing is provided with an oil filling port 201, which is sealed with an M6 threaded cover. The wireless oil status monitoring device for oil-poor power equipment can be installed at the oil filling port 201 using an integrated adapter, and the power supply module 6 can use a high-efficiency lithium battery, and the sensor 33 uses a hydrogen and temperature and pressure sensor according to the requirements of the on-site application. The monitoring probe 32 probes into the top gas space of the bushing to collect, transmit, process and analyze the hydrogen, temperature and pressure data of the top gas space.

[0030] In summary, the wireless oil status monitoring device for low-oil power equipment provided in this embodiment protects the internal PCB board through a protective shell and a sensor base, and is inserted into the interior of the low-oil power equipment through an external monitoring component to collect data on the status of the oil or gas domain in the low-oil power equipment, and then processes the data through the PCB board to monitor the key parameters of the top oil domain of the low-oil power equipment, and realize the monitoring of oil and gas in the operation of low-oil power equipment with no oil extraction port in the middle or a narrow oil extraction port, especially installing the device at the external hole position on the high-voltage side of the equipment to monitor the gas state of the top oil domain, and realize the monitoring of key parameters of all points of low-oil power equipment, so that this type of equipment has an oil status monitoring means, and realizes the escort for the safe and stable operation of this type of equipment, and solves the problem that the existing low-oil equipment has no oil extraction port in the middle or a narrow oil extraction port, which leads to monitoring difficulties. In addition, the device has a compact structure to avoid interference with the installation and use of other components.

[0031] Furthermore, the thresholds of monitoring parameters can be determined so that the low-oil equipment in the middle that does not have the conditions for oil status monitoring can have monitoring means. Research has been conducted on wireless hydrogen, temperature, pressure and humidity sensing technologies that are resistant to electromagnetic interference and do not require an external power supply. The wireless oil status monitoring device for low-oil power equipment has the characteristics of low power consumption, strong signal and resistance to electromagnetic interference, and can realize key parameter monitoring of the top oil field of low-oil equipment. At the same time, the device can perform wireless monitoring without an external power supply, which is convenient for the use and installation of the device.

[0032] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0033] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A wireless oil status monitoring device for oil-poor power equipment, characterized in that: include: A protective housing having an opening at a bottom end thereof; A sensor base is detachably disposed at the open end of the protective shell, and a protective cavity is formed between the sensor base and the protective shell; A monitoring component is arranged on a side of the sensor base facing away from the protective housing, and one end is arranged on the sensor base, and the other end is used to extend into the interior of the oil-less power equipment to collect data on the state of the oil domain or gas domain in the oil-less power equipment; A PCB board is arranged in the protective cavity and is connected to the sensor.

2. The wireless oil status monitoring device for oil-poor power equipment according to claim 1 is characterized in that: The monitoring components include: A monitoring probe rod is placed on one side of the sensor base, a connecting end of the monitoring probe rod is arranged on the sensor base, and a communication end is used to extend into the interior of the low-oil power equipment to communicate with the low-oil power equipment; A sealing joint is arranged inside the monitoring probe rod, and the sealing joint divides the monitoring probe rod into a monitoring area and a sealing protection area which are independent of each other, and corresponds to the connecting end and the connecting end of the monitoring probe rod respectively, so as to seal the sealing protection area of ​​the monitoring probe rod; The sensor is arranged inside the monitoring area and is used for collecting data on the state of the oil or gas domain in the oil-scarce electrical equipment.

3. The wireless oil status monitoring device for oil-poor power equipment according to claim 2 is characterized in that: The sensor is one or any combination of a hydrogen sensor, a temperature and pressure sensor, and a humidity / micro-water sensor.

4. The wireless oil status monitoring device for oil-poor power equipment according to claim 2 is characterized in that: A flexible guide belt is provided in the monitoring area of ​​the monitoring probe rod for supporting the sensor.

5. The wireless oil status monitoring device for oil-poor power equipment according to claim 2 is characterized in that: A lateral communication hole communicating with the monitoring area is provided on the side wall of the monitoring probe; The connecting end and the communicating end of the monitoring probe rod are both arranged in an open manner, and the communicating end of the monitoring probe rod is provided with a cap for bottom sealing.

6. The wireless oil status monitoring device for oil-poor power equipment according to any one of claims 1 to 5, characterized in that: A shielding plate is disposed on the sensor base, a shielding cavity is formed between the shielding plate and the sensor base, and the PCB board is disposed in the shielding cavity.

7. The wireless oil status monitoring device for oil-poor power equipment according to claim 6 is characterized in that: There are gaps between the PCB board and the sensor base and the shielding plate respectively.

8. The wireless oil status monitoring device for oil-poor power equipment according to claim 6 is characterized in that: Support columns are respectively provided between the PCB board and the sensor base and the shielding plate, for supporting the PCB board and the shielding plate.

9. The wireless oil status monitoring device for oil-poor power equipment according to claim 6 is characterized in that: The protective cavity is also provided with a power supply module for supplying power to the PCB board; The PCB board is provided with an antenna, which penetrates the shielding plate and extends to a side of the shielding plate facing away from the sensor base.

10. The wireless oil status monitoring device for oil-poor power equipment according to any one of claims 1 to 5, characterized in that: The protective shell is an ABS plastic shell; A sealing ring is provided between the protective shell and the sensor base.

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