Side wall type CT oil level recognition device based on ultrasonic waves

Abstract

The utility model relates to a side wall type CT oil level identification device based on ultrasonic waves, which comprises a device body and a remote platform, encryption communication is adopted between the device body and the remote platform, the device body comprises a control unit, an ultrasonic sensing unit, a power supply system and a wireless module, and the ultrasonic sensing unit is in bidirectional connection with the control unit. The control unit is respectively connected with the power supply system and the wireless module; the ultrasonic sensing unit comprises a data receiving module and an ultrasonic probe; the power supply system comprises an energy consumption management module and a storage battery; the system has the advantages of reasonable structure, convenience in use, high reliability, wireless and passive properties, and simplicity and rapidness in installation and deployment.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of electric power internet of things, concretely relates to a side wall formula CT oil level identification device based on ultrasonic wave. BACKGROUND

[0002] With the continuous development of society, the current electric power system has become an indispensable part of human life, and CT as an important part of the electric power system, the insulating oil in its interior is one of the key factors to ensure the normal operation of CT, if the oil level of the insulating oil in CT is unreasonable, it is likely to cause the unplanned shutdown of the transformer, thereby affecting power supply, therefore, it is very important to monitor the oil level of the insulating oil in CT, at present, domestic substation mainly relies on ultrasonic oil level measuring device or artificial inspection for CT oil level monitoring, the existing ultrasonic oil level measuring device is limited by the measuring method, must be installed vertically below the oil pillow, and the CT device does not have deployment conditions below, the artificial inspection is low in efficiency, high in cost and unable to realize real-time monitoring, the existing CT oil level measuring device adopts image technology to measure the oil level, is complex in installation and difficult in operation and maintenance, utilizes the visual sensor to judge the oil level position by observing the oil level window, but the observation window is prone to oil stains, the sensor is difficult to accurately identify, resulting in large oil level error, therefore, it is very necessary to provide a kind of side wall formula CT oil level identification device based on ultrasonic wave, which is reasonable in structure, convenient to use, high in reliability, wireless and passive, simple and rapid in installation and deployment. SUMMARY

[0003] The utility model discloses a kind of side wall formula CT oil level identification devices based on ultrasonic wave, which is reasonable in structure, convenient to use, high in reliability, wireless and passive, simple and rapid in installation and deployment, to overcome the deficiencies of prior art.

[0004] The utility model discloses a kind of side wall formula CT oil level identification devices based on ultrasonic wave, which is reasonable in structure, convenient to use, high in reliability, wireless and passive, simple and rapid in installation and deployment, to overcome the deficiencies of prior art.

[0005] The data receiving module and ultrasonic probe are respectively installed on the upper and lower sides of the front of the device body, the longitudinal wave signal of the ultrasonic probe is incident to the oil chamber inner wall at an angle of α from the CT outer side wall, and reflection and transmission of the wave are generated, and the data information is received by the data receiving module.

[0006] The range of the angle α is 30° < α < 50°.

[0007] The wireless module is arranged on the top of the inside of the device body, an antenna is arranged on the top of the front of the device body relative to the right side of the wireless module, and the device body is connected with the antenna through the wireless module to realize LoRa encrypted transmission to a remote platform in a working frequency range of 470MHz-510MHz.

[0008] The battery is arranged at a lower position of the inside of the device body, an energy consumption management module is arranged above the battery, and a control unit is arranged above the energy consumption management module.

[0009] The battery is a 3.6V / 19Ah lithium battery.

[0010] A group of fixing hole positions arranged in a vertical mode are formed on the left and right sides of the front of the device body, the device body is installed on the oil window in a non-invasive mode through the fixing hole positions and the binding belt, and the front ends of the data receiving module and the ultrasonic probe are uniformly coated with ultrasonic coupling agent, so that the front ends are closely attached to the surface of the oil window.

[0011] The device has the advantages that the device is a side wall type CT oil level recognition device based on ultrasonic waves, in use, the wireless passive CT oil level recognition device of the device adopts an ultrasonic measurement mode to realize high-precision recognition and reliable monitoring of the oil level, is powered by a 3.6V / 19Ah lithium battery, relies on the ultrasonic reflection principle, judges the liquid level position based on the echo signal of the ultrasonic longitudinal wave reflected by the oil surface, the ultrasonic wave is incident to the solid-liquid interface from the outside wall of the CT observation window, a reflected echo is formed at the interface, the oil surface position can be judged based on the echo signal, the ultrasonic measurement data is transmitted to a remote platform by using the LoRa low-power wireless technology, long-term reliable wireless transmission of the oil level recognition result can be realized, a large amount of wiring on site is avoided, no additional power supply needs to be arranged, the device is suitable for complex working conditions and can work in a temperature range of -40 DEG C to +85 DEG C, the problems of complex structure and inconvenient processing and assembly of the existing ultrasonic oil level recognition device are solved, and the device has the advantages of reasonable structure, convenient use, high reliability, wireless passivity and simple and fast installation and arrangement. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 The device is a structural diagram.

[0013] Figure 2 The device is a front view.

[0014] Figure 3 The device is a side view.

[0015] Figure 4 The device is an installation schematic view.

[0016] Figure 5 The device is a measurement principle diagramFigure 1 .

[0017] Figure 6 The measurement principle diagram of the utility model Figure 2 .

[0018] Figure 7 The measurement flow chart of the utility model.

[0019] In the figure: 1, data receiving module 2, ultrasonic probe 3, fixed hole position 4, wireless module 5, antenna 6, control unit 7, energy consumption management module 8, battery 9, device body 10, ultrasonic coupling agent 11, oil window 12, bandage. Specific implementation

[0020] The utility model discloses a side wall type CT oil level recognition device based on ultrasonic wave adopts ultrasonic probe measurement, and the surface of ultrasonic probe is provided with polytetrafluoroethylene composite material oil-repellent coating, ultrasonic longitudinal wave is obliquely incident to the oil chamber inner wall from the CT lateral wall at α (30° < α < 50°) angle, and the reflection and transmission of wave are generated, and the oil level can be calculated according to the sound wave signal emission time and echo signal receiving time and path length information etc., is powered by 3.6V / 19Ah lithium sub-battery mode, relies on low power consumption frame and LoRa wireless technology, and the working frequency band is 470MHz ~ 510MHz, and the ultrasonic measurement data is transmitted to the remote platform, realizes that oil level measurement result long-term reliable wireless transmission, once finds the oil level abnormality and timely alarms operation and maintenance personnel relevant situation, guarantees the safe and stable operation of transformer substation.

[0021] The utility model will be further described below in connection with the drawings.

[0022] Embodiment 1

[0023] As Figures 1-7 shown, a side wall type CT oil level recognition device based on ultrasonic wave, it includes device body 9 and remote platform, and the device body 9 and remote platform adopt encrypted communication, the device body 9 includes control unit 6, ultrasonic sensing unit, power supply system and wireless module 4, the ultrasonic sensing unit is connected with control unit 6 two-way communication, and the control unit 6 is connected with power supply system, wireless module 4 respectively;The ultrasonic sensing unit includes data receiving module 1 and ultrasonic probe 2;The power supply system includes energy consumption management module 7 and battery 8.

[0024] In this embodiment, as Figure 1As shown, the utility model discloses a battery power supply, and oil level measurement data is reliably transmitted to remote platform by relying on LoRa low power wireless technology, supports remote alarm, notifies operation and maintenance personnel immediately once detecting oil level exception, to maintain the safe and stable operation of transformer substation, and the device is composed of ultrasonic sensing unit, wireless module and power supply system formed by energy consumption management module and battery.

[0025] The utility model discloses integrated energy consumption management module, fusion energy-saving design concept, ultrasonic probe measures oil level height periodically (default every day 4 times) after a certain time interval, prolongs system endurance, and life can reach 5 years, improves the environmental adaptability and economy of overall system.

[0026] Ultrasonic sensing unit is composed of ultrasonic probe and data receiving module, and the ultrasonic probe utilizes ultrasonic reflection principle to calculate oil level height according to the time and path length of transmitting ultrasonic longitudinal wave signal and receiving reflected echo signal, realizes device self-energy supply through the power supply mode of battery, and does not need to additionally lay power supply, adopts low power architecture, and the equipment is in sleep mode (power consumption <10muA) under normal circumstances, activates LoRa module to send data only when oil level changes more than threshold value (plus or minus 2%) or timing wakes up, and single transmission energy consumption is reduced to below 3mAh, and meanwhile, can adopt bundled installation, does not need to punch or wire, and realizes simple and rapid deployment of oil level identification device.

[0027] The data receiving module 1 and the ultrasonic probe 2 are respectively installed on the upper and lower sides in front of the device body 9, the longitudinal wave signal of the ultrasonic probe 2 is incident to the inner wall of the oil chamber at an angle of alpha from the outer side wall of CT, and the reflection and transmission of the wave are received by the data receiving module 1.

[0028] The range of the angle alpha is 30° < alpha < 50°.

[0029] The wireless module 4 is arranged inside and above the device body 9, the antenna 5 is arranged on the right side of the wireless module 4 above the front of the device body 9, and the device body 9 is loaded with the antenna 5 through the wireless module 4 to be transmitted to the remote platform by LoRa encryption transmission with a working frequency band of 470MHz-510MHz.

[0030] A group of fixed hole positions 3 arranged in a vertical direction are formed on the left and right sides of the front of the device body 9, the device body 9 is installed on the oil window 11 in a non-invasive manner through the binding belt 12 and the fixed hole position 3, and the front ends of the data receiving module 1 and the ultrasonic probe 2 are evenly smeared with ultrasonic coupling agent 10, to ensure that the front ends are closely combined with the surface of the oil window 11.

[0031] In the embodiment, as Figures 2-4The present invention consists of a data receiving module 1 and an ultrasonic probe 2 as the core detection unit. The front end of the ultrasonic probe 2 of the data receiving module 1 is uniformly coated with ultrasonic coupling agent 10 to ensure tight contact with the surface of the oil window 11, eliminate air gaps and improve ultrasonic penetration efficiency.

[0032] The data receiving module 1 is located at the top of the oil window, capturing the ultrasonic longitudinal wave echo signal reflected from the oil surface in real time and transmitting it to the control unit 6. The device body 9 is installed non-invasively through the strap 12 and fixing holes 3, without the need for drilling or wiring, which is suitable for the rapid deployment requirements of the outer wall of the CT observation window. The control unit 6 calculates the real-time oil level height h based on the time difference between ultrasonic longitudinal wave transmission and echo reception, combined with the preset algorithm to analyze the path propagation time and sound speed parameters (v1 = 1425 m / s in oil, v2 = 343 m / s in air), and transmits it to the remote platform through the wireless module 4 equipped with antenna 5 using LoRa technology (470MHz~510MHz band). The antenna design effectively enhances the signal stability in complex electromagnetic environments.

[0033] The power supply system is provided with a long-term stable energy source by a 3.6V / 19Ah lithium-ion battery 8, and the operation mode is optimized with the energy management module 7: the equipment enters sleep mode under normal conditions (power consumption <10μA), and is only awakened when the oil level change exceeds the threshold (±2%) or when a timed task is triggered. The energy consumption of a single data transmission is <3mAh, achieving 5 years of maintenance-free operation. This utility model optimizes acoustic transmission with a coupling agent, reduces the difficulty of operation and maintenance through non-invasive installation, and combines low-power architecture with wireless transmission to fully meet the high-precision, real-time, and long-term reliable monitoring requirements of substation side-wall CT oil level monitoring.

[0034] This invention relates to an ultrasonic-based side-wall CT oil level identification device. In use, this wireless passive CT oil level identification device employs ultrasonic measurement for high-precision identification and reliable monitoring of oil levels. It is powered by a 3.6V / 19Ah lithium-ion battery. Based on the principle of ultrasonic reflection, the device determines the liquid level position by the echo signal reflected from the longitudinal wave of the ultrasonic wave onto the oil surface. Ultrasonic waves are incident from the outer wall of the CT observation window onto the solid-liquid interface, forming a reflected echo. The oil level position can be judged based on the echo signal. Utilizing LoRa low-power wireless technology, the ultrasonic measurement data is transmitted to a remote platform, enabling long-term reliable wireless transmission of oil level identification results. This avoids extensive on-site wiring, eliminates the need for additional power supplies, and adapts to complex working conditions. It can operate within a temperature range of -40℃ to +85℃, solving the problems of complex structure and inconvenient assembly in existing ultrasonic oil level identification devices. This invention has the advantages of reasonable structure, ease of use, high reliability, wireless passive operation, and simple and quick installation and deployment.

[0035] Example 2

[0036] likeFigures 1-7 As shown, an ultrasonic-based sidewall CT oil level recognition device, which comprises a device body 9 and a remote platform, the device body 9 and the remote platform adopt encrypted communication, the device body 9 comprises a control unit 6, an ultrasonic sensing unit, a power supply system and a wireless module 4, the ultrasonic sensing unit is in bidirectional communication connection with the control unit 6, and the control unit 6 is connected with the power supply system and the wireless module 4 respectively; the ultrasonic sensing unit comprises a data receiving module 1 and an ultrasonic probe 2; the power supply system comprises an energy consumption management module 7 and a storage battery 8.

[0037] The data receiving module 1 and the ultrasonic probe 2 are respectively installed on the upper and lower sides of the front of the device body 9, the longitudinal wave signal of the ultrasonic probe 2 is incident to the inner wall of the oil chamber at an angle of α from the outer sidewall of the CT, and the reflection and transmission of the wave are received by the data receiving module 1.

[0038] The range of the angle α is 30°<α<50°.

[0039] The wireless module 4 is arranged inside and above the device body 9, an antenna 5 is arranged on the right side of the front of the device body 9 relative to the wireless module 4, and the device body 9 carries the antenna 5 through the wireless module 4 to realize LoRa encrypted transmission to the remote platform in the working frequency band of 470MHz-510MHz.

[0040] The storage battery 8 is arranged at the lower position inside the device body 9, the energy consumption management module 7 is arranged above the storage battery 8, and the control unit 6 is arranged above the energy consumption management module 7.

[0041] The storage battery 8 adopts a 3.6V / 19Ah lithium sub-battery.

[0042] A group of fixed hole positions 3 arranged in an up-down mode are formed on the left and right sides of the front of the device body 9, the device body 9 is non-invasively installed on the oil window 11 through the binding belt 12 and the fixed hole position 3, and the front ends of the data receiving module 1 and the ultrasonic probe 2 are uniformly coated with ultrasonic coupling agent 10, which is used to ensure that the surface of the oil window 11 is closely combined.

[0043] In the embodiment, the measurement principle of the device is as follows: Figure 5As shown, the device emits ultrasonic longitudinal waves from the outer wall of the container at an angle of a to the interface formed by the inner wall of the container and the oil medium, that is, the solid-liquid interface, to produce reflection and transmission of the waves, the ultrasonic probe is located at the lower end of the side wall of the observation window, the data receiving module is located at the upper end of the observation window, the vertical distance between the two is L, the diameter of the oil chamber is D, the propagation time of the ultrasonic wave from the emission to the receiving unit is t, the propagation time in the oil is t1, the propagation time between the oil surface and the inner wall is t2, the propagation time from the inner wall to the receiving unit is t3, the height of the oil surface is h, and the propagation path s1 and the propagation time t of the ultrasonic longitudinal wave in the oil and air are calculated, Therefore, t2=t-t3-t1, the actual propagation path length of the ultrasonic longitudinal wave in the oil is calculated to obtain the oil level height: v1t1+v2t2=s2, h=s2*sin a, wherein s2=s1, the speed of the ultrasonic wave in the air is about v2=343 m / s (v2=v3), and the propagation speed of the ultrasonic wave in the oil is v1=1425 m / s; if 0.4815t3<t<1.2407t3, the following cases are discussed: as shown, at this time, the oil level is higher than L / 2, the ultrasonic longitudinal wave reaches the inner wall of the oil chamber and still propagates in the oil for a period of time t4, the propagation time of the ultrasonic longitudinal wave from the oil surface to the receiving unit is t5, and the equation group v1t1=s2, v1t4+v2t5=s1 is obtained in combination with the known conditions, and the oil level h is v2t5*sin a+L / 2. Figure 6

[0044] The flow chart of the overall measurement is as shown in Figure 7 Specifically, ① power on: the device is powered on, and the program is started; ② initialization: initialization is completed, configuration parameters are loaded, and a preparation state is entered; ③ sensor detects oil level: the ultrasonic sensor emits an ultrasonic longitudinal wave signal and records the emission time, and waits for a new emission instruction; ④ receives the ultrasonic wave echo signal: the echo signal reflected by the oil surface is received, the receiving time is recorded, and a new echo signal is waited for; ⑤ oil level alarm: after processing, it is judged whether the oil level is too high or too low, and an abnormal oil level immediately triggers an alarm; after the alarm is triggered, the on-site processing of the operation and maintenance personnel is waited for, and if the oil level is normal, the next cycle of measurement is entered.

[0045] In summary, the side wall type ultrasonic measurement is adopted to realize accurate identification of the CT oil level, abnormal conditions of the oil level are found in time, manual inspection is reduced, safe, accurate and maintenance-free long-term monitoring is realized, wireless and passive design is adopted to realize wireless transmission of the oil level identification data, abnormal conditions of the CT oil level are alarmed in time, the difficulty of operation and maintenance is reduced, and the CT oil level monitoring is upgraded from passive response to preventive operation and maintenance.

[0046] ​The utility model is a kind of based on ultrasonic lateral wall type CT oil level identification device, in use, the wireless passive CT oil level identification device of the utility model adopts the high-precision identification and reliable monitoring of oil level using ultrasonic measurement mode, using 3.6V / 19Ah lithium sub battery mode power supply, relying on ultrasonic reflection principle, based on the echo signal of ultrasonic longitudinal wave reflected on oil surface to determine liquid level position, ultrasonic wave is incident to solid-liquid interface from the lateral wall outside CT observation window, and reflection echo is formed at interface, and oil surface position can be judged based on echo signal, using LoRa low-power wireless technology, ultrasonic measurement data is transmitted to remote platform, and long-term reliable wireless transmission of oil level identification result can be realized, a large number of wiring on site is avoided, power supply is not needed to be additionally deployed, complex working conditions are adapted, and it can work in-40~+85 ℃ temperature range, the problem of complex structure, inconvenient processing and assembling of existing ultrasonic oil level identification device is solved;The utility model has the advantages of reasonable structure, convenient to use, high reliability, wireless passive, simple and fast installation and deployment.

Claims

1. An ultrasonic-based sidewall CT oil level identification device, comprising a device body and a remote platform, and the device body and the remote platform adopt encrypted communication, characterized in that: The device body comprises a control unit, an ultrasonic sensing unit, a power supply system and a wireless module, the ultrasonic sensing unit is bidirectionally connected with the control unit, the control unit is connected with the power supply system and the wireless module respectively; the ultrasonic sensing unit comprises a data receiving module and an ultrasonic probe; the power supply system comprises an energy consumption management module and a storage battery.

2. An ultrasonic based sidewall CT oil level identification device as claimed in claim 1, wherein: The data receiving module and the ultrasonic probe are respectively installed on the upper and lower sides of the front of the device body, the longitudinal wave signal of the ultrasonic probe is obliquely incident to the inner wall of the oil chamber from the outer wall of the CT at an angle of α, and the reflection and transmission of the wave are generated, and the data information is received by the data receiving module.

3. An ultrasonic based sidewall CT oil level identification device as claimed in claim 2, wherein: The range of the angle α is 30°<α<50°.

4. The ultrasonic-based sidewall CT oil level identification device of claim 1, wherein: The wireless module is arranged inside and above the device body, an antenna is arranged on the right side of the wireless module above the front of the device body, and the device body works in the frequency band of 470MHz-510MHz through the LoRa encryption transmission of the antenna to the remote platform.

5. An ultrasonic based sidewall CT oil level identification device as claimed in claim 1, wherein: The storage battery is arranged at the lower position inside the device body, the energy consumption management module is arranged above the storage battery, and the control unit is arranged above the energy consumption management module.

6. An ultrasonic based sidewall CT oil level identification device as claimed in claim 5, wherein: The storage battery adopts a 3.6V / 19Ah lithium battery.

7. An ultrasonic based sidewall CT oil level identification device as claimed in claim 2, wherein: A group of fixed hole positions arranged in an up-down manner are formed on the left and right sides of the front of the device body, the device body is non-invasively installed on the oil window through the binding belt and the fixed hole positions, and the front ends of the data receiving module and the ultrasonic probe are uniformly smeared with ultrasonic coupling agent for closely adhering to the surface of the oil window.

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