Automatic alarm device for overheat of line conductor connecting fitting

Abstract

The application discloses a line conductor connecting hardware overheat automatic alarm device, which comprises cast iron fixing bolts and a warning device; the cast iron fixing bolts are used for fixing compression connectors and drainage plates at strain tower; the cast iron fixing bolts are made of cast iron material and comprise bolt heads, screw rods and nuts; a first through groove is formed by reserving space in the center of the bolt head and part of the screw rod; an alloy component is arranged in the first through groove; the warning device is arranged on a cross arm of the strain tower and is used for monitoring the position of the alloy component. According to the different thermal expansion and contraction degrees of two objects, when reaching a certain temperature, the alarm device is triggered to act, so that the heating problem of the conductor connecting position can be found in advance, and timely maintenance and treatment can be carried out.

Description

Technical Field

[0001] This invention relates to the field of overhead line operation and maintenance technology, and in particular to an automatic alarm device for overheating of line conductor connection hardware. Background Technology

[0002] In overhead lines, conductors are connected to insulator strings using crimp clamps to ensure electrical safety distance between the conductor and the tower. Then, through a lead wire, the conductor is connected to an insulator string on the other side of the tower, achieving conductor continuity and enabling current transmission. The insulator string secures the conductor to the tower, ensuring safe current transmission.

[0003] Because the steel-cored aluminum stranded wire conductors used to transmit electrical energy on a certain line are not continuous, they need to be connected at tension towers using wire fittings such as crimp clamps and current-carrying plates. This presents potential installation and quality issues, especially when the current is high. Excessive current transmission generates excessive heat, which can easily lead to overheating. If the installation is not tight or there are quality defects, the heat accumulation effect is amplified, increasing the risk of breakage. This can cause the crimp clamps or current-carrying plates to break, resulting in safety accidents such as conductors falling to the ground. Line maintenance units often use infrared thermometers to measure the temperature of the clamps and current-carrying points, particularly during the summer when temperatures are high and loads are heavy. When the temperature is too high, they notify the dispatch department to reduce the load or perform maintenance on the crimping and current-carrying points after a power outage.

[0004] CN114825230A discloses a temperature measuring device for transmission line bolts and its usage method, belonging to the field of bolt technology. It includes a mounting shell; two high-voltage transmission lines, each slidably connected to the inner surface of the mounting shell; two threaded rods slidably connected to the upper inner wall of the mounting shell; and second bolts threaded onto the circumferential surfaces of the two threaded rods; a protective shell slidably connected to the circumferential surfaces of the two high-voltage transmission lines; a limiting shell fixedly connected to the upper end of the protective shell; and an infrared thermometer mounted on the upper side of the limiting shell; and two sets of fixing mechanisms, both housed within the mounting shell and connected to the two high-voltage transmission lines to secure them. The device is large in size and weight, placing a heavy load on the transmission line, and is inconvenient for measurement and installation. Summary of the Invention

[0005] To overcome the above-mentioned defects, the purpose of this invention is to provide an automatic alarm device for overheating of wire connection hardware. Based on the different thermal expansion and contraction of two objects, the alarm device is triggered when a certain temperature is reached, so as to detect the overheating problem at the conductor connection in advance and carry out timely inspection and maintenance.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] An automatic alarm device for overheating of line conductor connection hardware includes a cast iron fixing bolt and a warning device. The cast iron fixing bolt is used to fix the crimping clamp and the drain plate at the tension tower. The cast iron fixing bolt is made of cast iron and includes a bolt head, a threaded rod, and a nut. A first through groove is formed by reserving a space in the center of the bolt head and part of the threaded rod. An alloy component is provided in the first through groove. The warning device is installed on the crossarm of the tension tower to monitor the position of the alloy component.

[0008] Optionally, the first through groove is cylindrical in shape and its length does not exceed half the total length of the screw.

[0009] Optionally, the alloy component may be made of aluminum, copper-aluminum, or copper-tin.

[0010] Optionally, the alloy component is made into a spring shape, which pops out when heated to a certain temperature, causing the small ball at the top of the component to move.

[0011] Optionally, the warning device includes a battery and an alarm, a buzzer, a flash, a camera, a wireless transmitter, and a positioning device, all connected to the battery respectively; the alarm is connected to the wireless transmitter, the buzzer, the flash, and the camera; the positioning device is connected to the wireless transmitter; and the wireless transmitter is connected to a remote maintenance display terminal.

[0012] Optionally, a displacement sensor is provided at the outer end of the alloy component; the warning device includes a battery and an alarm, a buzzer, a flashlight, a positioning device, and a wireless transmitter, all connected to the battery respectively; the alarm is connected to the buzzer and the flashlight; the alarm is connected to the positioning device; the positioning device is connected to the wireless transmitter; the positioning information of the positioning device is transmitted to a remote maintenance display terminal via the wireless transmitter.

[0013] Optionally, a solar panel is provided on the adjustment plate, and the solar panel is connected to the battery.

[0014] The positive and beneficial effects of this invention are:

[0015] An alloy body of a different material is installed inside the cast iron fixing bolt. Based on the different thermal expansion and contraction of the two objects, when a certain temperature is reached, the alarm device is triggered to detect the overheating problem at the conductor connection in advance and carry out timely inspection and maintenance.

[0016] This device can be used not only for early warning detection of overheating at the connection of overhead conductors, but also for alarms of other problems such as machine overheating caused by long-term operation. This invention has important practical value in ensuring the safe operation of the line and timely detection and elimination of overheating hazards. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the automatic alarm device for overheating of line conductor connection hardware provided in Embodiment 1 of the present invention;

[0018] Figure 2 This is a schematic diagram of the structure of the diversion plate and cast iron fixing bolts provided in Embodiment 1 of the present invention;

[0019] Figure 3 This is a schematic diagram of the structure of the cast iron fixing bolt provided in Embodiment 1 of the present invention;

[0020] Figure 4 This is a schematic block diagram of the equipment workflow provided in Embodiment 1 of the present invention, which shows the alarm device sending the device to the maintenance display terminal and then to the maintenance inspection and repair process when the device is overheated.

[0021] Figure 5 This is a schematic diagram of the warning device provided in Embodiment 2 of the present invention, which is installed on the adjustment plate.

[0022] 1. Warning device; 2. Cast iron fixing bolt; 21. Bolt head; 22. Screw; 23. Nut; 24. First through slot; 25. Alloy component; 3. Crimping clamp; 4. Drain plate; 5. Drain line; 6. Solar panel; 7. Adjustment plate; 8. Small ball. Detailed Implementation

[0023] The present invention will be further described below with reference to some specific embodiments.

[0024] Example 1

[0025] like Figures 1 to 4 As shown, an automatic alarm device for overheating of line conductor connection hardware includes a cast iron fixing bolt 2 and a warning device 1. The cast iron fixing bolt 2 is used to fix the crimping clamp 3 and the diverting plate 4 at the tension tower. The cast iron fixing bolt 2 is made of cast iron and includes a bolt head 21, a screw 22 and a nut 23. A first through groove 24 is formed by reserving a space in the center of the bolt head 21 and part of the screw 22. An alloy component 25 is provided in the first through groove 24. The warning device 1 is installed on the crossarm of the tension tower to monitor the position of the alloy component 25.

[0026] This application pertains to devices used in overhead power lines. During operation, the conductors carrying electrical energy in power transmission lines have temperature limitations. When the temperature exceeds the critical value, the conductors and their connecting hardware will rise, potentially causing the hardware and conductors to melt and break. This application utilizes the physical principle of thermal expansion due to temperature rise to create a simple and practical device that automatically trips and triggers an alarm when the conductor temperature of a high-voltage line exceeds the critical value, drawing attention and allowing for timely handling.

[0027] The first through slot 24 is cylindrical in shape, and its length does not exceed half the total length of the screw 22, ensuring the structural strength of the cast iron fixing bolt 2. The alloy component 25 is made of aluminum, copper-aluminum, or copper-tin. The alloy component 25 is made in a spring-like shape. At the same temperature, the aluminum, copper-aluminum, or copper-tin alloy component 25 requires more space and can move a larger displacement when the temperature is too high. The monitoring of the warning device 1 can remotely determine in real time whether the temperature of the high-voltage line conductor connection part exceeds the critical value. Under normal circumstances, objects expand and contract with temperature. When the temperature rises by the same amount, the size of thermal expansion and contraction is different. Because the line conductors are connected by crimping clamps 3, drain plates 4, and fixing bolts, the conductor temperature is the same. However, the melting points of different objects are different, and their coefficients of thermal expansion are also different. For example, the coefficient of thermal expansion of aluminum is greater than that of copper, and the coefficient of thermal expansion of copper is greater than that of iron, etc.

[0028] Utilizing this characteristic of metallic objects, a combined device is constructed. When the temperature reaches above the stable operating temperature of the main equipment, an alarm device is triggered for early warning. Inside the cast iron fixing bolt 2, a space, namely the first through groove 24, is reserved to accommodate aluminum, copper-aluminum, aluminum-tin, or other alloys. When the cast iron fixing bolt 2 is heated, due to the greater thermal expansion and contraction effect of the alloy compared to cast iron, it will be squeezed out of this space, triggering the alarm device 1. The alloy component 25 within this space is made into a spring shape. After being heated to a certain temperature, it pops out, causing the small ball 8 at the top of the component to displace, resulting in a larger amplitude and more sensitive triggering. This overheat automatic alarm device can not only be used for overheating early warning detection at the connection points of overhead conductors, but also for alarming other problems such as machine overheating caused by long-term operation. It has significant practical value and a wide range of applications in ensuring safe operation of lines and timely detection and elimination of overheating hazards.

[0029] Furthermore, the warning device 1 (capture, alarm, location and transmission equipment unit) includes a battery and an alarm, a buzzer, a flash, a camera, a positioning device and a wireless transmitter respectively connected to the battery; the alarm is connected to the wireless transmitter, the buzzer, the flash and the camera; the positioning device is connected to the wireless transmitter; the wireless transmitter is connected to a remote maintenance display terminal.

[0030] When heated, the internal alloy component 25 undergoes significant thermal expansion, and its pushing and popping motion is captured by the camera. The displacement information of the alloy component is then captured by the camera within the warning device. The camera emits a corresponding signal to trigger the alarm, which in turn sends an electrical signal to activate the buzzer, flashlight, and positioning device. The wireless transmitter sends the alarm location information to the maintenance display terminal. Upon receiving the alarm's electrical signal, the buzzer sounds an alarm, and the flashlight illuminates the area, attracting the attention of on-site inspection personnel. The wireless transmitter also wirelessly transmits the alarm location signal to the line operation and maintenance unit, allowing for real-time reception and viewing on the maintenance display terminal for timely repairs and maintenance. A positioning device, such as GPS, is also installed. When the alarm signal is triggered, the positioning device simultaneously transmits its current location information wirelessly to a remote maintenance display terminal (which can be a mobile phone, tablet, or computer), enabling maintenance personnel to quickly locate the fault and proceed with repairs, significantly improving work efficiency.

[0031] A solar panel 6 is installed on the crossarm and connected to the battery. The solar panel 6 converts solar energy into electrical energy to continuously replenish the battery, greatly improving the endurance of the capture, alarm, positioning and transmission equipment unit 7.

[0032] Example 2

[0033] refer to Figure 5 Unlike Embodiment 1, the warning device 3 (capture, alarm, positioning and transmission equipment unit) monitors the position of the alloy component 25. The warning device 3 is set on the adjustment plate 7 to monitor the position of the alloy component 25. It can make full use of the adjustment spare bolt holes on the adjustment plate 7, and can also reduce the distance between the warning device 3 and the alloy component 25. At the same time, because the distance is close, a thin steel wire mechanical linkage alarm device can be used, and the camera capture device can be eliminated.

[0034] Example 3

[0035] Unlike Embodiment 1, the method by which the capture, alarm, positioning, and transmission device unit monitors the alloy component 25 is as follows: a displacement sensor is installed at the outer end of the alloy component 25; the capture, alarm, positioning, and transmission device unit includes a battery and an alarm, a buzzer, a flash, a positioning device, and a wireless transmitter, all connected to the battery; the displacement sensing information is wirelessly connected to the capture camera; the alarm is connected to the positioning device, the buzzer, and the flash; and the wireless transmitter is connected to the positioning device and a remote maintenance display terminal.

[0036] The displacement sensor can detect the relative displacement of alloy component 25 due to thermal expansion. When the displacement reaches a certain level, it will send an alarm signal to the wireless transmitter to trigger the alarm. The alarm will send an electrical signal to trigger the buzzer, flashing light and wireless transmitter. The alarm location signal can be wirelessly transmitted to the line operation and maintenance unit through the wireless transmitter. It can be received and viewed at any time through the operation and maintenance display terminal, and timely inspection and maintenance can be carried out.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Any other modifications or equivalent substitutions made by those skilled in the art to the technical solutions of the present invention, as long as they do not depart from the spirit and scope of the technical solutions of the present invention, should be covered within the scope of the claims of the present invention.

Claims

1. A line conductor connection fitting overheat automatic alarm device, characterized by, The application relates to a cast iron fixing bolt and a warning device; the cast iron fixing bolt is used for fixing a compression connector and a drainage plate at a strain tower; the cast iron fixing bolt is made of cast iron material and comprises a bolt head, a screw rod and a nut; a first through groove is formed by reserving space in the inside center of the bolt head and part of the screw rod; an alloy component is arranged in the first through groove; the warning device is arranged on a cross arm of the strain tower and is used for monitoring the position of the alloy component; The first through groove is in the shape of a cylinder and has a length not more than half of the total length of the screw rod; the alloy component is made of aluminum, copper-aluminum or copper-tin; the alloy component is made in the form of a spring and is popped out after being heated to a certain temperature to drive the small ball at the top of the component to move; The warning device comprises a battery and an alarm, a buzzer, a flash lamp, a camera, a wireless transmitting device and a positioning device which are connected with the battery respectively; the alarm is connected with the wireless transmitting device, the buzzer, the flash lamp and the camera; the positioning device is connected with the wireless transmitting device; the wireless transmitting device is connected with a remote operation and maintenance display terminal.

2. A device for automatically alarming overheating of a line conductor connection fitting according to claim 1, wherein A displacement sensor is arranged at the outer end of the alloy component; the alarm is connected with the positioning device; the positioning information of the positioning device is transmitted to the remote operation and maintenance display terminal through the wireless transmitting device.

3. A line conductor connection fitting overheat automatic alarm device according to claim 2, characterized in that, A solar panel is arranged on the adjusting plate and is connected with the battery.

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