Wireless transformer insulating oil pressure detection device

Abstract

The utility model discloses a wireless transformer insulating oil pressure detection device, which comprises a pressure detection circuit, a signal conversion circuit, a central control circuit, a wireless data transmitting and receiving circuit, an antenna, a power supply control circuit, a battery pack and a liquid crystal display screen, the pressure detection circuit, the signal conversion circuit, the central control circuit, the wireless data transmitting and receiving circuit and the antenna are connected in sequence, the liquid crystal display screen is connected with the central control circuit so as to be used for displaying collected pressure data, the battery pack comprises a 24V output end and a 5V output end, and the power supply control circuit comprises two power supply control branch circuits so as to control the 24V output end and the 5V output end. The transformer insulation oil leakage monitoring device is low in power consumption, transmits detection data through a wireless transmission technology, can meet the requirement that inspection personnel remotely monitor the leakage condition of transformer insulation oil, and can change the device form based on matched components so as to reduce the interference of an electromagnetic environment on signal transmission.

Description

Technical Field

[0001] The utility model belongs to the field of instrument equipment, and in particular relates to a wireless transformer insulating oil pressure detection device. Background Art

[0002] With the increasing demand for transformers and the increasing safety requirements, transformer sealing performance has become particularly critical, as it directly impacts the transformer's stable and safe operation. Insulating oil leakage is a common fault in transformer operation, making oil tank leak detection particularly important. Traditional detection methods rely primarily on manual labor, including observation, positive pressure sealing tests, kerosene penetration leak tests, vacuum sealing tests, gas relay methods, and nitrogen pressure leak tests. The effectiveness of these methods relies on the experience and commitment of inspectors, often leading to problems such as delayed detection, long detection cycles, and high costs. Furthermore, substations are equipped with numerous primary and secondary devices. During equipment operation and state transitions, a large amount of electromagnetic energy is generated, resulting in an extremely complex electromagnetic environment within the station. This can negatively impact or even completely obscure the signals of wireless transmission devices, and even more seriously, damage equipment. Utility Model Content

[0003] The technical problem to be solved by the present invention is as follows: In view of the above-mentioned problems of the prior art, a wireless transformer insulating oil pressure detection device is provided. The present invention has low power consumption and transmits detection data through wireless transmission technology, which can meet the needs of patrol personnel to remotely monitor the leakage of transformer insulating oil. Moreover, based on supporting components, the device shape can be changed to reduce the interference of the electromagnetic environment on signal transmission.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0005] A wireless transformer insulating oil pressure detection device comprises a pressure detection circuit, a signal conversion circuit, a central control circuit, a wireless data transmission and reception circuit, an antenna, a power control circuit, a battery pack, and a liquid crystal display. The pressure detection circuit is used for transformer insulating oil pressure data. The pressure detection circuit, signal conversion circuit, central control circuit, wireless data transmission and reception circuit, and antenna are connected in sequence. The liquid crystal display is connected to the pressure detection circuit or the central control circuit for displaying the collected pressure data. The battery pack comprises a 24V output end and a 5V output end. The power control circuit comprises two independent power control branches. The 24V output end is connected to the pressure detection circuit via one power control branch of the power control circuit, and the 5V output end is respectively connected to the signal conversion circuit, the central control circuit, the wireless data transmission and reception circuit, and the liquid crystal display via the other power control branch of the power control circuit.

[0006] Optionally, the power control branch includes a self-locking switch and a switching circuit connected in series, and the switching circuit includes resistors R1 to R3, a photocoupler U1, a Schottky diode D1 and a MOSFET tube Q1. Among the pins of the photocoupler U1: pin 1 is connected to the input terminal A1 of the central control circuit through resistor R1, pin 2 is directly connected to the ground GND, pin 3 is connected to the ground GND through resistor R3, and pin 4 is directly connected to the gate of the MOSFET tube Q1; the source of the MOSFET tube Q1 is connected to the 24V output terminal or the 5V output terminal, and the drain serves as the output terminal, the resistor R2 is connected in parallel between the 24V output terminal or the 5V output terminal and the gate of the MOSFET tube Q1, one end of the Schottky diode D1 is connected to the drain of the MOSFET tube Q1, and the other end is connected to the ground GND.

[0007] Optionally, it also includes a detachably connected instrument body and a cylindrical shell, the pressure detection circuit, self-locking switch and liquid crystal display are installed on the instrument body, the instrument body is also provided with a pressure collection port for connecting to the oil filling and discharge port ball valve of the transformer tank, the pressure collection port is connected to the pressure detection circuit, the signal conversion circuit, central control circuit, wireless data transmission and receiving circuit, and power supply control circuit are all installed inside the cylindrical shell, and a SAM antenna seat interconnected with the wireless data transmission and receiving circuit is provided on the outer wall of the cylindrical shell, and the antenna is installed on the SAM antenna seat.

[0008] Optionally, a threaded base is provided on the instrument body outside the liquid crystal display screen, and a detachable window cover for protecting the liquid crystal display screen is installed on the threaded base.

[0009] Optionally, the instrument body and the cylindrical shell are threadedly connected, and a sealing ring is sleeved on the external thread section of the instrument body on the side close to the cylindrical shell to achieve sealing between the instrument body and the cylindrical shell.

[0010] Optionally, a wiring port is provided on the end face of the instrument body on one side close to the cylindrical shell, and the cable led out of the pressure detection circuit passes through the wiring port and is connected to the input end of the signal conversion circuit, and the cable led out of the pressure detection circuit is interference fit with the wiring port to keep the internal sealing of the instrument body.

[0011] Optionally, a data interface is further provided on the outer wall of the cylindrical housing, and the data interface is connected to the central control circuit.

[0012] Optionally, a detachable battery compartment is further included, one end of the cylindrical shell is connected to the instrument body, and the other end is connected to the battery compartment, the battery pack is installed in the battery compartment, and a fixing plate is provided on the side of the battery compartment.

[0013] Optionally, the battery pack includes a 5V battery and a 24V battery.

[0014] Optionally, a detachable expansion cover that can be used interchangeably with the instrument body is further included, wherein the detachable expansion cover is used to replace the instrument body so that the wireless transformer insulating oil pressure detection device can serve as a data transfer station for other wireless transformer insulating oil pressure detection devices.

[0015] Compared with the prior art, the present invention has the following major advantages: The present invention discloses a wireless transformer insulating oil pressure detection device, comprising a pressure detection circuit, a signal conversion circuit, a central control circuit, a wireless data transmission and reception circuit, an antenna, a power control circuit, a battery pack, and a liquid crystal display. The pressure detection circuit is used to detect transformer insulating oil pressure data. The pressure detection circuit, signal conversion circuit, central control circuit, wireless data transmission and reception circuit, and antenna are sequentially connected. The liquid crystal display is connected to the central control circuit to display the collected pressure data. The battery pack includes a 24V output terminal and a 5V output terminal. The power control circuit includes two power control branches to control the 24V output terminal and the 5V output terminal. The present invention has low power consumption and transmits detection data via wireless transmission technology, enabling patrol personnel to remotely monitor transformer insulating oil leakage. Furthermore, based on the supporting components, the device configuration can be changed to reduce interference from the electromagnetic environment on signal transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the principle structure of the device in the embodiment of the utility model.

[0017] Figure 2 Schematic diagram of the circuit principle of the self-locking switch in the embodiment of the present utility model.

[0018] Figure 3 It is a schematic diagram of the three-dimensional structure of the device in the embodiment of the present utility model.

[0019] Figure 4 This is a schematic diagram of the three-dimensional structure of the instrument body in an embodiment of the present utility model.

[0020] Figure 5 This is a schematic diagram of the data transfer station structure of the device in the embodiment of the present utility model.

[0021] The definitions of the numbers in the figure are as follows: 1. Pressure detection circuit; 2. Signal conversion circuit; 3. Central control circuit; 4. Wireless data transmission and reception circuit; 5. Antenna; 6. Power control circuit; 7. Battery pack; 8. LCD display; 9. Instrument body; 901. Pressure collection port; 902. Window cover; 903. Sealing ring; 904. Wiring port; 91. Columnar shell; 911. SAM antenna seat; 912. Data interface; 92. Battery compartment; 921. Fixing plate; 93. Separate expansion cover. DETAILED DESCRIPTION

[0022] The following describes in detail embodiments of the present invention. Examples of such embodiments are illustrated in the accompanying drawings, where identical or similar reference numerals throughout denote identical or similar elements or elements having identical or similar functions. The embodiments described below with reference to the accompanying drawings are illustrative and intended solely to explain the present invention and are not to be construed as limiting the present invention. In the description of the present invention, references to "first," "second," and so on are intended solely for the purpose of distinguishing technical features and are not to be construed as indicating or implying relative importance, the number of such referenced technical features, or the order of such referenced technical features. Where references to orientation, such as "upper," "lower," and so on, are used in conjunction with the orientations or positional relationships shown in the accompanying drawings, such references are intended solely for the purpose of facilitating the description of the present invention and simplifying the description. They are not intended to indicate or imply that the device or element referred to must have, be constructed, or operate in a specific orientation, and are therefore not to be construed as limiting the present invention. Unless otherwise expressly defined, terms such as "dispose," "install," and "connect" in the description of the present invention should be interpreted broadly. Persons skilled in the art can reasonably determine the specific meanings of such terms in the present invention based on the specific content of the technical solution.

[0023] like Figure 1As shown, the embodiment provides a wireless transformer insulation oil pressure detection device, which comprises a pressure detection circuit 1, a signal conversion circuit 2, a central control circuit 3, a wireless data transmission and receiving circuit 4, an antenna 5, a power supply control circuit 6, a battery pack 7 and a liquid crystal display screen 8. The pressure detection circuit 1 is used for pressure data of transformer insulation oil. The pressure detection circuit 1, the signal conversion circuit 2, the central control circuit 3, the wireless data transmission and receiving circuit 4 and the antenna 5 are sequentially connected. The liquid crystal display screen 8 is connected to the pressure detection circuit 1 or the central control circuit 3 for displaying the collected pressure data. The battery pack 7 comprises a 24V output end and a 5V output end. The power supply control circuit 6 comprises two independent power supply control branches. The 24V output end is connected to the pressure detection circuit 1 through one power supply control branch of the power supply control circuit 6. The 5V output end is connected to the signal conversion circuit 2, the central control circuit 3, the wireless data transmission and receiving circuit 4 and the liquid crystal display screen 8 through the other power supply control branch of the power supply control circuit 6. The wireless transformer insulation oil pressure detection device of the embodiment has low power consumption. The detection data is transmitted through wireless transmission technology, which can meet the remote monitoring of transformer insulation oil leakage by the inspection personnel. Moreover, based on the matching components, the device form can be changed to reduce the interference of the electromagnetic environment on the signal transmission.

[0024] In the embodiment, the pressure detection circuit 1 is an existing pressure transmitter comprising data transmission and processing functions. In addition, a pressure sensor can also be used as needed. In the embodiment, the pressure sensitive core of the pressure detection circuit 1 adopts a high-performance silicon piezoresistive pressure oil-filled core, which has a temperature drift and zero drift of ±0.3% FS / 10℃. The 24V power supply is used to transmit the differential level signal of the modbus communication protocol in the form of RS485, and has a CRC data check bit. The device has the characteristics of long transmission distance and small transmission error, and can support the anti-interference ability of the signal wired transmission when the device is modularized and separated.

[0025] In the embodiment, the signal conversion circuit 2 is used for converting the differential pressure signal into a TTL level signal. One side of the signal conversion circuit 2 receives the differential pressure signal transmitted by the pressure detection circuit 1 in the form of RS485 protocol through two receiving ends, and the other end converts the differential signal into a TTL level signal and outputs it to the central control circuit 3. Similarly, the signal conversion circuit 2 can also convert the TTL level signal into an RS485 differential signal to realize the bidirectional communication with the central control circuit 3 as needed.

[0026] The central control circuit 3 utilizes a single-chip microcomputer. In this embodiment, the central control circuit 3 specifically uses the STMicroelectronics 32-bit ultra-low-power STM32L053R8T6 single-chip microcomputer as the main control chip. This chip features a wide operating temperature range, stable operation, and low power consumption, making it suitable for environments near transformer insulating oil tanks. The microcontroller's baud rate-configurable transceiver serial port peripheral receives converted pulse signals from the output of the signal conversion circuit module, parses the received raw data according to the communication protocol, and stores it in the microcontroller's built-in flash memory for transmission. Simultaneously, corresponding AT commands are sent via the serial port to control the wireless data transmission and reception circuit 4 to connect to the cloud server, exchange data, and send and receive commands. Furthermore, the microcontroller features a stop mode. In this stop mode, most CPU functions cease to operate, with only a few RTC wake-up and external interrupt sources active. With a quiescent current of only 4 microamperes, this achieves extremely low standby power consumption and relatively low operating power consumption.

[0027] The wireless data transmission and reception circuit 4 is an existing circuit. This embodiment specifically utilizes a low-power NB-IOT module, which is connected to the central control circuit 3 via a serial port. The NB-IOT module boasts wide coverage, low power consumption, and low cost, enabling widespread transmission of transformer insulating oil pressure data. It also features a sleep mode. The cloud server to which this module uploads data supports connections to multiple NB-IOT modules, enabling unified monitoring data, viewing historical data curves, and setting alert notifications. Furthermore, the frequency of device data reporting can be customized to meet varying monitoring requirements.

[0028] The power control branch in this embodiment includes a self-locking switch 61 and a switch circuit connected in series. The self-locking switch 61 is used for overall power control, and the switch circuit can be used to control the working state of the pressure detection circuit 1, so that the power supply can be turned off when the pressure detection circuit 1 does not need to work to achieve energy saving. Taking the power control branch of the 24V output end as an example, Figure 2As shown, the switch circuit in the power supply control branch includes resistors R1-R3, a photoelectric coupler U1, a Schottky diode D1 and a MOSFET tube Q1. In the photoelectric coupler U1, the No. 1 pin is connected to the input end A1 of the central control circuit 3 through the resistor R1, the No. 2 pin is directly connected to the ground GND, the No. 3 pin is connected to the ground GND through the resistor R3, and the No. 4 pin is directly connected to the gate of the MOSFET tube Q1. The source of the MOSFET tube Q1 is connected to the 24V output end or the 5V output end, and the drain is used as the output end. The resistor R2 is connected in parallel between the 24V output end or the 5V output end and the gate of the MOSFET tube Q1. The Schottky diode D1 is connected between the drain of the MOSFET tube Q1 and the ground GND. The switch circuit in the power supply control branch of the 6V output end is the same as the above-mentioned circuit, except that the input power supply is 5V, and thus is not described here again. In the switch circuit in the embodiment, the MOSFET tube and the isolation photoelectric coupler are used to realize the switching of the power supply controlled by the single-chip microcomputer IO. In the standby state of the device, Figure 3 In the switch circuit, the control port A1 of the output end of the central control circuit module is in a low-level state, there is no potential difference between the No. 1 and No. 2 pins of the photoelectric coupler U1, and thus the No. 3 and No. 4 pins of the photoelectric coupler U1 are in an off state. Therefore, there is no potential difference between the source and the gate of the MOSFET tube, and the MOSFET tube is in a cut-off state. The 5V power supply control circuit is the same, and thus, in addition to the single-chip microcomputer being in a stop mode and the NB-IOT module being in a sleep mode, the 24V and 5V power supplies of the pressure detection circuit module and the signal conversion circuit module are in an off state. When the single-chip microcomputer is awakened, A1 is in a high-level state, a potential difference is generated between the No. 1 and No. 2 pins of the photoelectric coupler U1, and thus the No. 3 and No. 4 pins of the photoelectric coupler U1 are in a conductive state. At this time, the 24V power supply is connected in series with the resistors R2 and R3 and the ground GND. The gate of the MOSFET tube has half of the power supply voltage under the voltage division of the resistor R2. At this time, the gate of the MOSFET tube is greater than the cut-off voltage, the source and the drain of the MOSFET tube are in a conductive state, and thus the 24V and 5V power supplies are turned on. In the off state of the power supply control circuit, the power consumption is very low. This avoids the power consumption of the device without a sleep function when it is not needed, and thus improves the endurance of the device.

[0029] In the embodiment, the battery pack 7 includes a 5V storage battery and a 24V storage battery. The battery pack 7 in the embodiment combines two battery packs with different voltages, selects a suitable capacity according to the above-mentioned system operation flow, and thus can realize long-time endurance. The design of the two voltage battery avoids the power loss caused by the use of a step-down circuit.

[0030] The LCD display 8 of this embodiment is connected to the circuit board of the pressure detection circuit 1 through a 2.54mm pin array. It is only used during debugging and can be removed before the instrument is operated to reduce the power consumption of the pressure detection circuit module during operation.

[0031] like Figure 3 As shown, this embodiment of the wireless transformer insulating oil pressure detection device also includes a detachably connected instrument body 9 and a cylindrical housing 91. The pressure detection circuit 1, self-locking switch, and LCD display 8 are mounted on the instrument body 9. The instrument body 9 also features a pressure collection port 901 for connecting to the transformer tank oil filling and discharge port ball valve. The pressure collection port 901 has a matching flange connection that can be connected to the transformer tank oil filling and discharge port ball valve flange. The pressure collection port 901 is in communication with the pressure detection circuit 1. The signal conversion circuit 2, central control circuit 3, wireless data transmission and reception circuit 4, and power control circuit 6 are all mounted within the cylindrical housing 91. A SAM antenna mount 911, interconnected with the wireless data transmission and reception circuit 4, is provided on the outer wall of the cylindrical housing 91. The antenna 5 is mounted on the SAM antenna mount 911. In this embodiment, the signal conversion circuit 2, central control circuit 3, wireless data transmission and reception circuit 4, and power control circuit 6 are integrated on a single printed circuit board (PCB) and secured to the cylindrical housing 91 via plastic gaskets and screws for data transmission, reception, and conversion. Since the outer wall of the cylindrical housing 91 is provided with a SAM antenna base 911 interconnected with the wireless data transmission and reception circuit 4, and the antenna 5 is mounted on the SAM antenna base 911, the data transmission and reception part can be separated from the detection part, reducing the interference of the transformer on the signal transmission. Figure 3 It can be seen that the self-locking switch 61 in this embodiment is installed on the outer wall of the cylindrical housing 91 to facilitate manual control of the power on and off.

[0032] like Figure 3 As shown, a threaded base is provided on the instrument body 9 of this embodiment, located outside the liquid crystal display screen 8 , and a detachable window cover 902 for protecting the liquid crystal display screen 8 is installed on the threaded base.

[0033] like Figure 4 As shown, the meter body 9 and cylindrical housing 91 of this embodiment are threadedly connected. A sealing ring 903 is sleeved on the externally threaded section of the meter body 9 on the side near the cylindrical housing 91 to seal the meter body 9 and the cylindrical housing 91. A wiring port 904 is provided on the end face of the meter body 9 on the side near the cylindrical housing 91. The cable leading from the pressure detection circuit 1 passes through the wiring port 904 and is connected to the input end of the signal conversion circuit 2. The cable leading from the pressure detection circuit 1 has an interference fit with the wiring port 904 to maintain the internal seal of the meter body 9.

[0034] like Figure 3As shown, the outer wall of the cylindrical housing 91 of this embodiment is further provided with a data interface 912, which is connected to the central control circuit 3. This embodiment also includes a detachable battery compartment 92, which is threadedly connected to the cylindrical housing 91. One end of the cylindrical housing 91 is connected to the instrument body 9, and the other end is connected to the battery compartment 92. The battery pack 7 is installed in the battery compartment 92, and a fixing plate 921 is provided on the side of the battery compartment 92.

[0035] like Figure 5 As shown, this embodiment also includes a detachable expansion cover 93 that can be used interchangeably with the instrument body 9. This detachable expansion cover 93 is used to replace the instrument body 9, allowing the wireless transformer insulation oil pressure detection device to serve as a data transfer station for other wireless transformer insulation oil pressure detection devices. The instrument body 9 is unscrewed from the cylindrical housing 91, which houses the printed circuit board (PCB) containing the signal conversion circuit 2, central control circuit 3, wireless data transmission and reception circuit 4, and power supply control circuit 6, and then detachable expansion cover 93 is screwed on to enable it to function as a data transfer station.

[0036] In summary, the wireless transformer insulating oil pressure detection device of the present invention uses wireless instruments to detect widely distributed transformer oil tank leakage, saving the cost of manual inspection and instrument wiring costs, and improving the accuracy of the detection results and the efficiency of detection. The internal power supply design of the present invention is more suitable for the instrument to work alone, reducing the impact of external power supply on the instrument. Relying on the design of the power control circuit, only the NB-IOT module can work when the device is on standby, and it consumes very little electricity in the sleep state, so that the monitoring system can perform long-term detection work without replacing batteries. The segmented instrument housing design gives the device the ability to modularly separate the detection part and the data transmission and receiving part, and use matching components for modular reorganization, thereby realizing the separation of the data transmission and receiving part and the detection part, and placing the data transmission and receiving part in a place with good signal and less environmental interference to reduce the possibility of signal interference. The wireless transformer insulating oil pressure detection device of this embodiment has the advantages of convenient detection, low power consumption and low cost, and can replace manual detection of transformer insulating oil leakage.

[0037] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiment. All technical solutions based on the concept of the present invention are within the scope of protection of the present invention. It should be noted that for those skilled in the art, certain improvements and modifications that do not depart from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A wireless transformer insulating oil pressure detection device, characterized in that: The invention comprises a pressure detection circuit (1), a signal conversion circuit (2), a central control circuit (3), a wireless data transmission and reception circuit (4), an antenna (5), a power control circuit (6), a battery pack (7) and a liquid crystal display (8), wherein the pressure detection circuit (1) is used for the pressure data of the transformer insulating oil, the pressure detection circuit (1), the signal conversion circuit (2), the central control circuit (3), the wireless data transmission and reception circuit (4) and the antenna (5) are connected in sequence, the liquid crystal display (8) is connected to the pressure detection circuit (1) or the central control circuit (3) for displaying the collected pressure data, the battery pack (7) comprises a 24V output terminal and a 5V output terminal, the power control circuit (6) comprises two independent power control branches, and the 24V output terminal is connected to the pressure detection circuit (1) through one power control branch of the power control circuit (6) The 5V output end is connected to the signal conversion circuit (2), the central control circuit (3), the wireless data transmission and receiving circuit (4) and the liquid crystal display (8) through another power control branch of the power control circuit (6); the wireless transformer insulating oil pressure detection device also includes a detachably connected instrument body (9) and a cylindrical shell (91), the pressure detection circuit (1), the self-locking switch and the liquid crystal display (8) are installed on the instrument body (9), the instrument body (9) is also provided with a pressure collection port (901) for connecting to the oil filling and discharge port ball valve of the transformer oil tank, the pressure collection port (901) is communicated with the pressure detection circuit (1), the signal conversion circuit (2), the central control circuit (3), the wireless data transmission and receiving circuit (4), and the power control circuit (6) are all installed inside the cylindrical shell (91), and a SAM antenna seat (911) interconnected with the wireless data transmission and receiving circuit (4) is provided on the outer wall of the cylindrical shell (91), and the antenna (5) is installed on the SAM antenna seat (911).

2. The wireless transformer insulating oil pressure detection device according to claim 1, characterized in that: The power control branch includes a self-locking switch (61) and a switch circuit connected in series. The switch circuit includes resistors R1 to R3, a photocoupler U1, a Schottky diode D1 and a MOSFET tube Q1. Among the pins of the photocoupler U1: pin 1 is connected to the input terminal A1 of the central control circuit (3) through the resistor R1, pin 2 is directly connected to the ground GND, pin 3 is connected to the ground GND through the resistor R3, and pin 4 is directly connected to the gate of the MOSFET tube Q1; the source of the MOSFET tube Q1 is connected to the 24V output terminal or the 5V output terminal, and the drain serves as the output terminal. The resistor R2 is connected in parallel between the 24V output terminal or the 5V output terminal and the gate of the MOSFET tube Q1. One end of the Schottky diode D1 is connected to the drain of the MOSFET tube Q1, and the other end is connected to the ground GND.

3. The wireless transformer insulating oil pressure detection device according to claim 1, characterized in that: A threaded base is provided on the instrument body (9) outside the liquid crystal display screen (8), and a detachable window cover (902) for protecting the liquid crystal display screen (8) is mounted on the threaded base.

4. The wireless transformer insulating oil pressure detection device according to claim 1, characterized in that: The instrument body (9) and the cylindrical housing (91) are threadedly connected, and a sealing ring (903) is sleeved on the external thread section of the instrument body (9) on the side close to the cylindrical housing (91) to achieve sealing between the instrument body (9) and the cylindrical housing (91).

5. The wireless transformer insulating oil pressure detection device according to claim 4, characterized in that: The instrument body (9) is provided with a wiring port (904) on the end face of one side close to the cylindrical shell (91). The cable led out of the pressure detection circuit (1) passes through the wiring port (904) and is connected to the input end of the signal conversion circuit (2). The cable led out of the pressure detection circuit (1) is interference-fitted with the wiring port (904) to keep the interior of the instrument body (9) sealed.

6. The wireless transformer insulating oil pressure detection device according to claim 1, wherein: A data interface (912) is also provided on the outer wall of the cylindrical housing (91), and the data interface (912) is connected to the central control circuit (3).

7. The wireless transformer insulating oil pressure detection device according to claim 1, characterized in that: It also includes a detachable battery compartment (92), one end of the columnar housing (91) is connected to the instrument body (9), and the other end is connected to the battery compartment (92), the battery pack (7) is installed in the battery compartment (92), and a fixing plate (921) is provided on the side of the battery compartment (92).

8. The wireless transformer insulating oil pressure detection device according to claim 1, characterized in that: The battery pack (7) includes a 5V battery and a 24V battery.

9. The wireless transformer insulating oil pressure detection device according to claim 1, characterized in that: It also includes a detachable expansion cover (93) that can be used interchangeably with the instrument body (9), wherein the detachable expansion cover (93) is used to replace the instrument body (9) so that the wireless transformer insulating oil pressure detection device can serve as a data transfer station for other wireless transformer insulating oil pressure detection devices.

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