Wide-angle temperature monitoring device in non-contact power switch cabinet

Abstract

The invention relates to the technical field of switch cabinet infrared thermal imaging temperature online monitoring, and discloses a non-contact wide-angle temperature monitoring device in a power switch cabinet, which comprises an infrared thermal imaging temperature measurement sensor, a serial port server, a network switch, an infrared thermal imaging temperature measurement host and an upper computer, and the infrared thermal imaging temperature measurement sensor is connected to the serial port server through RS485 communication. According to the internal wide-angle infrared monitoring device for temperature measurement of the non-intrusive power switch cabinet, manual temperature measurement can be performed without opening the switch cabinet, the risks of power failure, power failure and electric shock are avoided, the safety is improved, the maintenance cost is reduced, the downtime is shortened, the temperature distribution in a relatively large range in the switch cabinet can be monitored, and the temperature of a certain point is not only measured; more comprehensive temperature information is provided, potential hot spot areas can be found as soon as possible, through network connection, the system can collect temperature data and thermal images in real time and transmit the information to a remote upper computer, remote monitoring and maintenance are facilitated, and efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of on-line infrared thermal imaging temperature monitoring for switchgear, and particularly to a non-contact wide-angle temperature monitoring device inside a power switchgear. Background Art

[0002] At present, the traditional manual regular inspection method can no longer meet the requirements of power supply reliability and cannot adapt to the operation and management needs of modern substation equipment. Therefore, it is urgent to fundamentally change the current preventive maintenance system, and its development direction must be to adopt on-line monitoring and diagnosis technology.

[0003] In the power system, there are many criteria for measuring whether primary equipment is operating normally. Among them, temperature is an important indicator. Electrical equipment connection parts such as the joints inside high and low voltage switchgear, bus connection points, circuit breakers, main transformer bushing clamps, high-voltage cable joints, etc. are prone to increased contact resistance due to reasons such as material aging, corrosion, overloading operation, contact oxidation, and arc impact. During operation, they often continuously heat up. After overheating during operation, it leads to a greater contact resistance and a more serious vicious cycle of heating, and finally results in insulation burnout, forming an inter-phase or inter-phase short circuit and instantly triggering a fire.

[0004] There are mainly three existing technologies: First, a handheld infrared thermometer is used to monitor the temperature of equipment. When the handheld infrared instrument inspects high-voltage switches, due to metal shielding and the fact that the cabinet door cannot be opened during the operation of the high-voltage switch, most of the internal equipment cannot be inspected. Second, contact temperature measurement such as patch-type temperature sensors is adopted, which is directly installed on the device to be monitored, and there are problems such as limited monitoring area and increased safety hazards for high-voltage primary equipment. Third, non-contact temperature measurement using point-type infrared sensors is adopted. Although it solves the problem of not increasing the safety hazards of high-voltage primary equipment, it still cannot solve the problem of limited monitoring area. When the equipment heats up, it cannot be detected in time. Therefore, a non-contact wide-angle temperature monitoring device inside a power switchgear is proposed to solve the above problems. Summary of the Invention

[0005] (1) Technical Problems to be Solved

[0006] In view of the deficiencies of the prior art, the present invention provides a non-contact wide-angle temperature monitoring device inside a power switch cabinet, which has the advantages of extremely high reliability, safety, and strong visibility. It solves the problems that the temperature monitoring points of existing electrical equipment are all in environments with high voltage, large current, and strong magnetic field, and some monitoring points are even in enclosed spaces. Due to problems such as strong electromagnetic noise, high-voltage insulation, and space limitations, ordinary temperature measurement methods cannot solve these problems and cannot be used, making it difficult to monitor the operating temperature of high-voltage equipment joints in real time and online. Moreover, the prior art mainly uses a handheld infrared thermometer to monitor the equipment temperature. When the handheld infrared device inspects high-voltage switches, due to metal shielding and the inability to open the cabinet door during the operation of the high-voltage switch, the internal equipment cannot be inspected, and it is impossible to detect in time when the equipment is overheating.

[0007] (II) Technical Solution

[0008] To achieve the above object, the present invention provides the following technical solution: A non-contact wide-angle temperature monitoring device inside a power switch cabinet, including an infrared thermal imaging temperature sensor, a serial server, a network switch, an infrared thermal imaging temperature host, and a host computer.

[0009] Preferably, the infrared thermal imaging temperature sensor is communicatively connected to the serial server through RS485, the serial server is electrically connected to the network switch through a network cable, the network switch is electrically connected to the infrared thermal imaging temperature host through a network cable, and the output end of the infrared thermal imaging temperature host is electrically connected to the input end of the host computer.

[0010] Preferably, the infrared thermal imaging temperature sensor is used to locate the key temperature measurement areas and collect the operating temperature within the visible range of the sensor in real time.

[0011] Preferably, the infrared thermal imaging temperature host is used to collect the temperature data uploaded by each temperature sensor in the distribution room and is used for on-site display, alarm prompt, parameter setting, event recording, and data record viewing.

[0012] Preferably, the host computer is a computer, and the host computer is used to receive and record the processed temperature data and image information transmitted by the infrared thermal imaging temperature host, display the thermal image, generate a temperature report, perform data analysis, and set the alarm threshold.

[0013] Preferably, the measurement range of the infrared thermal imaging temperature sensor is -30°C to +300°C, the upper limit value of the temperature alarm value of the infrared thermal imaging temperature host is +90°C, the lower limit value is -20°C, the upper limit value of the temperature warning value of the infrared thermal imaging temperature host is +60°C, and the lower limit value is -10°C.

[0014] Preferably, the infrared thermal imaging temperature measurement sensor includes an infrared detector, an optical imaging objective lens, and an opto-mechanical scanning mechanism.

[0015] Preferably, the infrared detector converts infrared radiant energy into an electrical signal, which is amplified and processed, and the converted signal passes through the infrared thermal imaging temperature measurement host and the upper computer to display the infrared thermal image.

[0016] Preferably, the laser aiming locator emits a laser beam and forms a visible light spot on the object to be measured, and locates the center point within the temperature measurement range.

[0017] Preferably, the upper computer can be used to control the infrared thermal imaging temperature measurement sensor for spot temperature measurement and local temperature monitoring, and display the temperature on the upper computer in real time.

[0018] Preferably, the opto-mechanical scanning mechanism scans the infrared thermal image of the object to be measured and focuses it on the spectroscopic detector.

[0019] (III) Beneficial effects

[0020] Compared with the prior art, the present invention provides a non-contact wide-angle temperature monitoring device inside a power switch cabinet, having the following beneficial effects:

[0021] This non-intrusive wide-angle infrared monitoring device for temperature measurement inside a power switch cabinet does not require opening the switch cabinet for manual temperature measurement, avoiding the risks of power outage, power failure, and electric shock, improving safety, reducing maintenance costs and downtime, and the temperature measurement method can be controlled by the upper computer in the device. It can monitor the temperature distribution in a large area inside the switch cabinet instead of only measuring the temperature at a certain point, which provides more comprehensive temperature information and helps to detect potential hot spots early. Through network connection, the system can collect temperature data and thermal images in real time and transmit the information to a remote upper computer, which facilitates remote monitoring and maintenance and improves efficiency. The upper computer can be used to set the alarm threshold. When the temperature exceeds the set value, the system will automatically alarm to remind the maintenance personnel to handle it in time to avoid accidents. By recording temperature data and thermal images, it is convenient for subsequent data analysis, providing a basis for equipment maintenance and fault diagnosis, which helps to perform predictive maintenance and improve the reliability of equipment operation. At the same time, the thermal image can be displayed on the upper computer, making the temperature distribution more intuitive and easy to understand, facilitating the maintenance personnel to judge the problem. Integrating the infrared thermal imaging temperature measurement sensor, serial server, network switch, infrared thermal imaging temperature measurement host, and upper computer into a system device simplifies the system architecture and improves usability. In short, combining infrared thermal imaging technology with network communication technology realizes non-contact, wide-angle, real-time monitoring and remote monitoring of the temperature inside the power switch cabinet, improving the safety and reliability of the operation of power equipment. Description of the drawings

[0022] Figure 1 Schematic diagram of the topology structure of the present invention;

[0023] Figure 2 Schematic three-dimensional structure diagram of the infrared thermal imaging temperature measurement sensor in the present invention;

[0024] Figure 3 Schematic three-dimensional structure diagram of the infrared thermal imaging temperature measurement host in the present invention;

[0025] Figure 4 Schematic front view structure diagram of the infrared thermal imaging temperature measurement sensor in the present invention;

[0026] Figure 5 Schematic diagram for calculating the temperature measurement area of the infrared thermal imaging temperature measurement sensor in the present invention;

[0027] Figure 6 Schematic diagram of the working principle of the infrared thermal imaging temperature measurement sensor in the present invention.

[0028] In the figure: 1 infrared thermal imaging temperature measurement sensor, 2 serial port server, 3 network switch, 4 infrared thermal imaging temperature measurement host, 5 upper computer. Specific embodiments

[0029] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0030] Please refer to Figure 1-6 , a non-contact wide-angle temperature monitoring device inside a power switch cabinet, including an infrared thermal imaging temperature measurement sensor 1, a serial port server 2, a network switch 3, an infrared thermal imaging temperature measurement host 4, and an upper computer 5.

[0031] Specifically, the infrared thermal imaging temperature measurement sensor 1 is communicatively connected to the serial port server 2 through RS485, the serial port server 2 is electrically connected to the network switch 3 through a network cable, the network switch 3 is electrically connected to the infrared thermal imaging temperature measurement host 4 through a network cable, and the output end of the infrared thermal imaging temperature measurement host 4 is electrically connected to the input end of the upper computer 5.

[0032] Embodiment 1:

[0033] Specifically, the infrared thermal imaging temperature measurement sensor 1 is used to collect the operating temperature within the visible range of the sensor in real time. The infrared thermal imaging temperature measurement sensor 1 includes an infrared detector, a laser aiming and positioning device, an optical imaging objective lens, and an opto-mechanical scanning mechanism.

[0034] Specifically, the upper computer controls the infrared thermal imaging temperature measurement sensor to switch between spot and local temperature monitoring modes.

[0035] Furthermore, the infrared detector converts infrared radiant energy into an electrical signal. After amplification and processing, the converted signal passes through the infrared thermal imaging temperature measurement host and the upper computer to display the infrared thermal image. The opto-mechanical scanning mechanism scans the infrared thermal image of the object to be measured and focuses it on the spectroscopic detector. The measurement range of the infrared thermal imaging temperature measurement sensor is -30°C to +300°C.

[0036] Furthermore, when the switch cabinet is powered off, the infrared thermal imaging temperature measurement sensor 1 is installed inside the switch cabinet by adsorption or screw fixation. The infrared thermal imaging temperature measurement sensor 1 is used for areas with narrow space, irregular temperature changes, and unclear monitoring positions. It uses thermal imaging sensing technology, big data communication technology, and image processing algorithms to achieve precise and miniaturized thermal imaging temperature measurement.

[0037] Furthermore, when the infrared thermal imaging temperature measurement sensor 1 calculates the measured local area:

[0038] Viewing angle 1: 110° * 75°;

[0039] Calculation method: W = 2.86 * L, H = 1.53 * L;

[0040] Viewing angle 2: 55° * 35°;

[0041] Calculation method: W = 1.04 * L, H = 0.63 * L.

[0042] Embodiment 2:

[0043] Specifically, the infrared thermal imaging temperature measurement host 4 includes a chassis and a touch display screen. The touch display screen is fixedly installed on the outer surface of the chassis. The infrared thermal imaging temperature measurement host 4 is used to collect the temperature data uploaded by each temperature measurement sensor in the distribution room and is used for on-site display, alarm prompt, parameter setting, event recording, and data record viewing.

[0044] Furthermore, the infrared thermal imaging temperature measurement host 4 uses the Modbus protocol and adopts the RS485 communication method to collect the temperature measurement data of the infrared thermal imaging temperature measurement sensor 1. The communication distance ≤ 1200m. All parameters can be set flexibly, the operation is convenient, and the data is not lost when the power is off. The infrared thermal imaging temperature measurement host 4 is equipped with a touch screen G20 extended output module. When an alarm event occurs, the relay dry contact signal is output and a buzzer alarm sound is emitted for prompt.

[0045] Furthermore, the upper limit value of the temperature alarm value of the infrared thermal imaging temperature measurement host 4 is +90°C, and the lower limit value is -20°C. The upper limit value of the temperature warning value of the infrared thermal imaging temperature measurement host 4 is +60°C, and the lower limit value is -10°C.

[0046] Furthermore, the infrared thermal imaging temperature measurement host 4 can specifically receive the data from the infrared sensor and the temperature sensor; display the received data in color, with a more intuitive display effect, and the backlight switch is controllable, suitable for various application scenarios; display through the real-time clock and use it as the time reference for event recording; record the temperatures at the temperature measurement positions where alarms have occurred, record the temperatures at the temperature measurement positions where early warnings have occurred, and record the data when the temperature returns to normal after exceeding the limit; can query the historical curves of each temperature measurement point, can query the historical data of each temperature point in the most recent month, and is convenient to export to an EXCEL table; record the monthly highest temperature records of each temperature measurement point and generate a bar chart of the highest records; when the data freezing density of each temperature measurement point is set to 5 minutes, the historical data of 3 years can be frozen; and adopts a password management method, and a password must be entered when setting parameters.

[0047] Embodiment 3:

[0048] Specifically, the host computer 5 is a computer. The host computer 5 is used to receive and record the processed temperature data and image information transmitted by the infrared thermal imaging temperature measurement host 4, display the thermal image, generate a temperature report, perform data analysis, and set the alarm threshold.

[0049] Furthermore, the connection between the output end of the infrared thermal imaging temperature measurement host 4 and the host computer 5 is usually completed through standard interfaces such as Ethernet (TCP / IP), USB, or RS-232. The specific connection method depends on the specific device model and system design, and a wireless connection method such as WiFi or Zigbee may also be adopted.

[0050] The working principle of the present invention: First, the host computer 5 controls the infrared thermal imaging sensor 1 to switch the temperature measurement method according to the on-site situation. Then, the infrared thermal imaging sensor 1 collects data in real time. The infrared detector converts the infrared radiant energy into an electrical signal. After the converted electrical signal is amplified and processed, it is transmitted to the serial port server 2 through the RS485 communication protocol. The serial port server 2 converts the RS485 signal into a network signal and transmits it to the infrared thermal imaging temperature measurement host 4 through the network switch 3. The infrared thermal imaging temperature measurement host 4 collects the temperature data from multiple sensors, processes them, and displays the local temperature data or point-type temperature data, thermal images, and alarm information on the touch display screen. The infrared thermal imaging temperature measurement host 4 transmits the processed temperature data and image information to the host computer 5. The software in the computer receives these data, displays the thermal image, generates a temperature report, performs data analysis, and allows the user to set the alarm threshold to achieve remote monitoring and management.

[0051] In summary, the non-intrusive wide-angle infrared monitoring device for temperature measurement of power switchgear eliminates the need to open the switchgear for manual temperature measurement, avoiding the risks of power outage, power failure, and electric shock, enhancing safety, reducing maintenance costs and downtime. It can monitor the temperature distribution over a large area inside the switchgear instead of just measuring the temperature at a single point, providing more comprehensive temperature information and facilitating the early detection of potential hot spots. Through network connection, the system can collect temperature data and thermal images in real time and transmit the information to the remote host computer 5, which facilitates remote monitoring and maintenance, improving efficiency. The alarm threshold can be set using the host computer. When the temperature exceeds the set value, the system will automatically alarm, alerting maintenance personnel to handle it in a timely manner to avoid accidents. By recording temperature data and thermal images, subsequent data analysis is facilitated, providing a basis for equipment maintenance and fault diagnosis, which contributes to predictive maintenance and improves the operational reliability of the equipment. At the same time, the thermal image can be displayed on the host computer 5, making the temperature distribution more intuitive and easy to understand, facilitating maintenance personnel to identify problems. Integrating the infrared thermal imaging temperature sensor 1, serial server 2, network switch 3, infrared thermal imaging temperature measurement host 4, and host computer 5 into a system device simplifies the system architecture and improves usability. In short, combining infrared thermal imaging technology with network communication technology enables non-contact, wide-angle, real-time monitoring and remote monitoring of the internal temperature of power switchgear, enhancing the safety and reliability of power equipment operation. It solves the problems that existing electrical equipment temperature monitoring points are in environments with high voltage, large current, and strong magnetic fields, and some monitoring points are even in enclosed spaces. Due to problems such as strong electromagnetic noise, high-voltage insulation, and space limitations, conventional temperature measurement methods cannot be used to solve these problems, making it difficult to monitor the operating temperature of high-voltage equipment contacts in real time online. Moreover, the existing technology mainly uses handheld infrared thermometers to monitor the equipment temperature. When using a handheld infrared device to inspect high-voltage switches, due to metal shielding and the inability to open the cabinet door during the operation of the high-voltage switch, it is impossible to inspect the internal equipment, and it is difficult to detect equipment overheating in a timely manner.

[0052] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "including", "comprising", or any other variant thereof is intended to cover non-exclusive inclusion, such that a process, method, article, or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or device. Without further limitation, an element defined by the phrase "including a..." does not exclude the existence of additional identical elements in the process, method, article, or device comprising the said element.

[0053] Although embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A non-contact wide-angle temperature monitoring device inside a power switch cabinet, characterized in that: It includes an infrared thermal imaging temperature measurement sensor (1), a serial port server (2), a network switch (3), an infrared thermal imaging temperature measurement host (4) and a host computer (5).

2. The non-contact wide-angle temperature monitoring device inside a power switch cabinet according to claim 1, characterized in that: The infrared thermal imaging temperature measurement sensor (1) is connected to the serial port server (2) through RS485 communication. The serial port server (2) is electrically connected to the network switch (3) through a network cable. The network switch (3) is electrically connected to the infrared thermal imaging temperature measurement host (4) through a network cable. The output end of the infrared thermal imaging temperature measurement host (4) is electrically connected to the input end of the host computer (5).

3. The non-contact wide-angle temperature monitoring device inside the power switch cabinet according to claim 1, wherein: The infrared thermal imaging temperature measurement sensor (1) is used to locate the area that needs to be key temperature measured and to collect the operating temperature within the visible range of the sensor in real time.

4. The non-contact wide-angle temperature monitoring device inside a power switch cabinet according to claim 1, characterized in that: The infrared thermal imaging temperature measurement host (4) is used to collect the temperature data uploaded by each temperature measurement sensor in the distribution room, and is used for on-site display, alarm prompt, parameter setting, event recording and data record viewing.

5. The non-contact wide-angle temperature monitoring device inside a power switch cabinet according to claim 1, wherein: The host computer (5) is a computer. The host computer (5) is used to receive and record the processed temperature data and image information transmitted by the infrared thermal imaging temperature measurement host (4), display the thermal image, generate a temperature report, perform data analysis and set the alarm threshold.

6. The non-contact wide-angle temperature monitoring device inside a power switch cabinet according to claim 1, wherein: The measurement range of the infrared thermal imaging temperature measurement sensor (1) is -30°C to +300°C. The upper limit value of the temperature alarm value of the infrared thermal imaging temperature measurement host (4) is +90°C, and the lower limit value is -20°C. The upper limit value of the temperature warning value of the infrared thermal imaging temperature measurement host (4) is +60°C, and the lower limit value is -10°C.

7. The non-contact wide-angle temperature monitoring device inside a power switch cabinet according to claim 1, characterized in that: The infrared thermal imaging temperature measurement sensor (1) includes an infrared detector, a laser aiming locator, an optical imaging objective lens and an opto-mechanical scanning mechanism. The infrared thermal imaging temperature measurement host (4) includes a chassis and a touch display screen.

8. A non-contact wide-angle temperature monitoring device inside a power switch cabinet according to claim 7, characterized in that: The infrared detector converts infrared radiant energy into an electrical signal. After amplification processing, the converted signal is used to display an infrared thermal image through the infrared thermal imaging temperature measurement host (4) and the host computer (5), and the opto-mechanical scanning mechanism.

9. The non-contact wide-angle temperature monitoring device inside a power switch cabinet according to claim 7, characterized in that: The laser aiming locator forms a visible light spot on the object to be measured by emitting a laser beam and locates the center point within the temperature measurement range.

10. A non-contact wide-angle temperature monitoring device inside a power switch cabinet according to claim 7, characterized in that: The host computer (5) can be used to control the infrared thermal imaging temperature measurement sensor (1) to perform spot temperature measurement and local temperature monitoring, and display the temperature on the host computer (5) in real time.

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