Cable terminal liquid level monitoring system

Abstract

The invention discloses a cable terminal liquid level monitoring system which at least comprises a processor, an ultrasonic ranging module, a wireless power supply module and an energy storage module. The wireless power supply module is electrically connected with the energy storage module, and the energy storage module is electrically connected with the ultrasonic ranging module; the ultrasonic ranging module comprises an ultrasonic transmitting unit and an ultrasonic receiving unit which are in signal connection with the processor, and when the processor judges that two ultrasonic signals received by the ultrasonic receiving unit are larger than or equal to the pulse width of the ultrasonic transmitting unit, the pulse width of the ultrasonic transmitting unit is reduced. Ultrasonic waves are used for detecting the oil sealing height, the wireless power supply module is used for taking electricity for equipment, the wireless signal transmission technology is used for data transmission, and signal collection and transmission are completed under the condition that any construction environment does not need to be changed.

Description

Technical Field

[0001] The invention relates to the technical field of electric power monitoring, and in particular to a cable terminal head liquid level monitoring system. Background Art

[0002] The current cable terminal products include fully prefabricated dry silicone rubber outdoor terminals and oil-filled terminals, and the oil-filled terminals are widely used. Most of the failures of oil-filled terminals are caused by the loss of oil injection inside the terminal, resulting in terminal withstand voltage failure. At present, there is no better technical means to detect the oil level of the terminal head. The main reason is that the cable terminal is the core equipment of the high-voltage cable, and its top and end have a high voltage of more than 100,000 volts, which cannot be measured using conventional detection technology.

[0003] With the continuous improvement of the level of urban modernization, higher requirements are placed on the stability and quality of the power supply system. High-voltage cables have gradually become an irreplaceable component of modern power grids due to their large transmission capacity, long transmission distance and low transmission loss. As a commonly used outdoor terminal for high-voltage cables, porcelain bushing terminals (porcelain bushings) have the advantages of good stability, corrosion resistance and aging resistance. During operation, silicone oil is usually filled into the porcelain bushing as an insulating and cooling medium to achieve insulation and heat dissipation between the high-voltage cable and the outside world, and to protect the normal and safe operation of the high-voltage cable. However, the insulating medium inside the porcelain bushing will be lost or leaked as the use time increases. The reduction in the amount of oil in the porcelain bushing will cause changes in the electric field distribution, thereby causing abnormal local heating of the porcelain bushing or joint breakdown. In severe cases, it will cause the porcelain bushing to explode, causing huge economic losses and even endangering the lives of people. Summary of the invention

[0004] The invention provides a cable terminal head liquid level monitoring system to solve the defect in the prior art that the insulating oil level in the cable terminal cannot be detected.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A cable terminal head liquid level monitoring system comprises at least a processor, an ultrasonic ranging module, a wireless power supply module, and an energy storage module;

[0007] The wireless power supply module is electrically connected to the energy storage module, and the energy storage module is electrically connected to the ultrasonic ranging module;

[0008] The ultrasonic ranging module includes an ultrasonic transmitting unit and an ultrasonic receiving unit respectively connected to the processor signal. When the processor determines that the two ultrasonic signals received by the ultrasonic receiving unit are greater than or equal to the pulse width of the ultrasonic transmitting unit, the pulse width of the ultrasonic transmitting unit is reduced.

[0009] As a further improvement, the wireless power supply module includes a CT ring, and the CT ring is sleeved on the cable.

[0010] As a further improvement, the system further includes a temperature acquisition unit, and the temperature acquisition unit is connected to the processor.

[0011] As a further improvement, the system also includes a wireless communication module, which includes a wireless sending unit and a wireless receiving unit. The wireless sending unit is electrically connected to the processor, and the wireless receiving unit is electrically connected to the upper computer display platform.

[0012] As a further improvement, the wireless transmitting unit and the wireless receiving unit use a 2.4 GHZ communication mode.

[0013] As a further improvement, the wireless receiving unit is electrically connected to the host computer display platform via RS485 / Ethernet / GPRSy.

[0014] As a further improvement, the cable oil-filled terminal includes an insulating sleeve, a base and a cable, the insulating sleeve is fixedly connected to the base, the insulating sleeve has an inner cavity containing insulating oil, and the cable passes from the base into the inner cavity and through the insulating sleeve.

[0015] As a further improvement, the ultrasonic transmitting unit and the ultrasonic receiving unit are respectively located on two sides of the cable.

[0016] As a further improvement, the ultrasonic ranging module further comprises a sensor base, the sensor base is arranged around the cable, and the ultrasonic transmitting unit and the ultrasonic receiving unit are mounted on the sensor base and electrically connected.

[0017] As a further improvement, installation centers of the ultrasonic transmitting unit, the cable and the ultrasonic receiving unit are on the same straight line.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] (1) Use ultrasonic waves to detect the oil seal height. Ultrasonic waves have high frequency, short wavelength, small diffraction phenomenon, and good directionality, and can be directional rays. Ultrasonic waves have little attenuation in liquids and solids, so they have strong penetrating power, especially in solids that are opaque to light. Ultrasonic waves can penetrate tens of meters in length, and will have significant reflections when they encounter impurities or interfaces.

[0020] (2) The wireless power supply module is used to draw power from the equipment, and the wireless signal transmission technology is used for data transmission. The signal collection and transmission are completed without changing any construction environment. Based on the characteristics of the cable oil filling terminal and the insulating oil, the ultrasonic detection method is used to detect the oil level of the insulating oil remotely to avoid the high voltage on the cable oil filling terminal from breaking through the collection device. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of the detection system of an embodiment of the present invention.

[0022] Figure 2 4 is a structural diagram of a detection system according to an embodiment of the present invention.

[0023] Description of reference numerals:

[0024] 1. Processor; 2. Wireless power supply unit; 3. Ultrasonic transmitting unit; 4. Ultrasonic receiving unit; 5. Temperature acquisition unit; 6. Wireless transmitting unit; 7. Wireless receiving unit; 8. Upper computer display platform. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] See also Figure 1 , a cable terminal head liquid level monitoring system, comprising at least a processor 1, an ultrasonic ranging module, a wireless power supply module, and an energy storage module;

[0027] The wireless power supply module is electrically connected to the energy storage module, and the energy storage module is electrically connected to the ultrasonic ranging module;

[0028] The ultrasonic ranging module includes an ultrasonic transmitting unit 3 and an ultrasonic receiving unit 4 respectively connected to the processor 1 by signal. When the processor 1 determines that the two ultrasonic signals received by the ultrasonic receiving unit 4 are greater than or equal to the pulse width of the ultrasonic transmitting unit 3, the pulse width of the ultrasonic transmitting unit 3 is reduced.

[0029] In an embodiment of the present invention, the wireless power supply module includes a CT ring, which is sleeved on a cable. The monitoring system draws power through the CT ring. When current flows through the CT ring, an induced current is generated at both ends of the CT ring. The power-drawing process is completed through a freewheeling device, a control device, a voltage stabilizing device, and an energy storage device. After sufficient electrical energy is stored, the system starts to work.

[0030] The ultrasonic ranging unit can use the ultrasonic level meter. The working principle is that the ultrasonic transducer (probe) emits a high-frequency pulse sound wave, which is reflected back when encountering the surface of the measured object (material). The reflected echo is received by the transducer and converted into an electrical signal. The propagation time of the sound wave is proportional to the distance from the sound wave to the surface of the object. The relationship between the sound wave transmission distance S, the sound speed C and the sound transmission time T can be expressed by the formula: S=C×T / 2.

[0031] In the embodiment of the present invention, the processor 1, namely, the MCU, can control and adjust the frequency of the ultrasonic wave, calculate the time difference between when the ultrasonic wave is sent and when it is received, and calculate the height of the oil level.

[0032] In the embodiment of the present invention, the system further comprises a temperature acquisition unit 5, and the temperature acquisition unit 5 is connected to the processor 1. Thermocouples are used for temperature measurement, which has strong anti-interference ability and high precision.

[0033] In the embodiment of the present invention, the system further includes a wireless communication module, which includes a wireless transmission unit 6 and a wireless receiving unit 7, wherein the wireless transmission unit 6 is electrically connected to the processor 1, and the wireless receiving unit 7 is electrically connected to the upper computer display platform 8. Among them, the upper computer displays data, detects the data, and after setting the alarm threshold, promptly feeds back the warning information to the customer, reminds the customer to be alert, and promptly troubleshoots the fault.

[0034] In the embodiment of the present invention, the wireless transmitting unit 6 and the wireless receiving unit 7 use a 2.4 GHZ communication mode, which has the advantages that the address and the frequency band can be set, so that a large number of products can be compatible without causing signal interference.

[0035] In the embodiment of the present invention, the wireless receiving unit 7 is electrically connected to the upper computer display platform 8 via RS485 / Ethernet / GPRSy.

[0036] In the embodiment of the present invention, the cable oil-filled terminal includes an insulating sleeve, a base and a cable. The insulating sleeve is fixedly connected to the base. The insulating sleeve has an inner cavity containing insulating oil. The cable passes through the inner cavity from the base and penetrates the insulating sleeve. Figure 2The cable oil-filled terminal 10 includes an insulating sleeve 11, a base 15 and a cable 16. The insulating sleeve 11 is fixedly connected to the base 15. The insulating sleeve 11 has an inner cavity 13 containing insulating oil 14. The cable 16 passes through the inner cavity 13 from the base and penetrates the insulating sleeve 11. The inner and outer insulation of the cable oil-filled terminal 10 are processed separately. The insulating sleeve 11 is an outer insulation, which can be a porcelain sleeve or a composite insulating sleeve 11. The inner insulation uses a prefabricated stress cone to control the electric field. The insulating oil 14 can be silicone oil or polyisobutylene liquid insulating oil 14. The insulating sleeve 11 is sealed and installed with the base to form a sealed inner cavity 13. The insulating oil 14 is located in the inner cavity 13, which plays a further insulating role. In some harsh environments, cracks appear in the insulating sleeve 11 itself or in the seal with the base, resulting in the loss of the insulating oil 14 in the inner cavity 13, causing the terminal withstand voltage failure.

[0037] In the embodiment of the present invention, the ultrasonic transmitting unit 3 and the ultrasonic receiving unit 4 are respectively located on both sides of the cable. In the embodiment of the present invention, the ultrasonic ranging module also includes a sensor base, which is arranged around the cable, and the ultrasonic transmitting unit 3 and the ultrasonic receiving unit 4 are installed on the sensor base and electrically connected.

[0038] In the embodiment of the present invention, the installation centers of the ultrasonic transmitting unit 3, the cable and the ultrasonic receiving unit 4 are on the same straight line.

[0039] The present invention provides a cable terminal head liquid level monitoring system, which mainly monitors the insulating oil level height in the porcelain sleeve / composite sleeve. The oil level height in the terminal can be displayed and monitored in real time to prevent the terminal from leaking oil and causing failure. When the internal liquid level of the terminal exceeds the limit, an automatic alarm can be realized to warn the failure in the terminal in advance. The terminal has a data remote transmission function, and all signals can be remotely transmitted.

[0040] 1) The insulating oil level in the porcelain bushing / composite bushing can be monitored.

[0041] 2) The compensation device can keep the pressure in the sealed container stable and not be affected by the thermal expansion and contraction of the insulating oil and gas, thus ensuring the accuracy of the data measured by the pressure sensor.

[0042] 3) It has a liquid level monitoring function and is equipped with a touch screen that can display the oil level in the terminal in real time and upload the data to the system background to prevent terminal oil leakage from causing malfunctions.

[0043] 4) When the liquid level inside the terminal exceeds the limit, an automatic alarm can be realized to provide early warning of faults in the terminal.

[0044] 5) The terminal has the function of remote data transmission, and all signals can be transmitted remotely.

[0045] 6) Power supply methods include: Solar power supply, CT induction power supply, AC220V, DC48 / 72V

[0046] 7) Transmission methods include: GPRS, 4G, SMS, wireless point-to-point transmission, WIF, optical fiber, Ethernet. GPRS, 4G, SMS methods need to be inserted into the SIM card.

[0047] The above is a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A cable terminal head liquid level monitoring system, characterized in that: At least includes a processor, an ultrasonic ranging module, a wireless power supply module, and an energy storage module; The wireless power supply module is electrically connected to the energy storage module, and the energy storage module is electrically connected to the ultrasonic ranging module; The ultrasonic ranging module includes an ultrasonic transmitting unit and an ultrasonic receiving unit respectively connected to the processor signal. When the processor determines that the two ultrasonic signals received by the ultrasonic receiving unit are greater than or equal to the pulse width of the ultrasonic transmitting unit, the pulse width of the ultrasonic transmitting unit is reduced.

2. The cable terminal head liquid level monitoring system according to claim 1, characterized in that: The wireless power supply module comprises a CT ring, and the CT ring is sleeved on the cable.

3. The cable terminal head liquid level monitoring system according to claim 1, characterized in that: The system also includes a temperature acquisition unit, which is connected to the processor.

4. The cable terminal head liquid level monitoring system according to claim 1, characterized in that: The system also includes a wireless communication module, which includes a wireless sending unit and a wireless receiving unit. The wireless sending unit is electrically connected to the processor, and the wireless receiving unit is electrically connected to the upper computer display platform.

5. The cable terminal head liquid level monitoring system according to claim 4, characterized in that: The wireless transmitting unit and the wireless receiving unit use a 2.4 GHZ communication mode.

6. The cable terminal head liquid level monitoring system according to claim 4, characterized in that: The wireless receiving unit is electrically connected to the upper computer display platform via RS485 / Ethernet / GPRSy.

7. The cable terminal head liquid level monitoring system according to claim 1, characterized in that: The cable oil-filled terminal comprises an insulating sleeve, a base and a cable. The insulating sleeve is fixedly connected to the base. The insulating sleeve has an inner cavity containing insulating oil. The cable passes from the base into the inner cavity and through the insulating sleeve.

8. The cable terminal head liquid level monitoring system according to claim 1, characterized in that: The ultrasonic transmitting unit and the ultrasonic receiving unit are respectively located on two sides of the cable.

9. The cable terminal head liquid level monitoring system according to claim 8, characterized in that: The ultrasonic distance measurement module further comprises a sensor base, the sensor base is arranged around the cable, and the ultrasonic transmitting unit and the ultrasonic receiving unit are mounted on the sensor base and electrically connected.

10. The cable terminal head liquid level monitoring system according to claim 1, characterized in that: The installation centers of the ultrasonic transmitting unit, the cable and the ultrasonic receiving unit are on the same straight line.

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