Temperature-measurement sensing apparatus and cable joint mounting structure

Abstract

The present invention relates to the technical field of high-voltage cable temperature measurement. Disclosed is a temperature-measurement sensing apparatus and a cable joint mounting structure. The temperature-measurement sensing apparatus comprises a nut, a temperature-measurement label and a housing cover, wherein the nut constitutes the body of the temperature-measurement sensing apparatus, and a recess is provided on the side surface of the nut; a pair of mounting holes are provided on each of two sides of the flat surface of the recess; the temperature-measurement label is placed in the recess, and the width of the temperature-measurement label is smaller than the distance between the two pairs of mounting holes on the left and right sides, such that the mounting holes are exposed; and a mounting column is inserted into each mounting hole, and the mounting columns support the housing cover, such that the housing cover covers the temperature-measurement label. The temperature-measurement sensing apparatus disclosed by the present invention can solve the problem of wireless monitoring of the temperature in a cable plug of a ring main unit.

Description

A temperature sensing device and cable connector installation structure Technical Field

[0001] The present invention relates to the technical field of high-voltage cable temperature measurement, and in particular to a temperature measurement sensor device and a cable connector installation structure. Background Art

[0002] Ring main unit (RMU) cabinets are specialized electrical connection devices widely used in 10kV AC power distribution systems in industrial and mining enterprises, residential communities, ports, and high-rise buildings. They aggregate and classify cable lines and provide control and measurement functions. Plugs are key components for connecting high-voltage cables within RMUs, providing connection, insulation, shielding, and protection. In practice, cable connections create contact resistance, which can easily lead to heat accumulation and explosions, fires, and other accidents. Therefore, monitoring the internal temperature of plugs is crucial.

[0003] Currently, the common methods for temperature measurement in high voltage environments are as follows:

[0004] 1. Wax sheet temperature measurement technology:

[0005] The advantages are simplicity and low cost. The disadvantages are low accuracy, poor reliability, and the inability to achieve real-time monitoring. Furthermore, it cannot measure parts that are easily heated and invisible during operation, such as T-type cable joints in ring network cabinets.

[0006] 2. Thermal infrared temperature measurement technology:

[0007] Advantages include a wide measurement range, high accuracy, and good reliability. Disadvantages include high equipment cost, the need for regular inspections, and the inability to provide real-time temperature monitoring. Furthermore, infrared thermometers are unable to measure temperatures in hidden locations where cable connectors are located. Furthermore, infrared thermometers are significantly affected by sunlight, so measurements should generally be taken at night or on rainy days.

[0008] 3. Fiber Bragg Grating Temperature Measurement Technology:

[0009] A grating is used as a temperature sensor, attached to the surface of the measured point. The temperature sensor (spectrum analyzer) is connected to the temperature sensor via an optical fiber. However, the optical fiber is easily broken and not heat-resistant. Furthermore, dust accumulation in humid environments degrades the insulation performance of the optical fiber, leading to surface discharge and potential safety hazards. Furthermore, installation and commissioning are labor-intensive and expensive.

[0010] With the development of RFID radio frequency identification technology and the emergence of temperature measurement chips, the combination of the two can achieve passive wireless temperature monitoring at cable joints, which can also prevent secondary accidents. However, due to the poor electromagnetic environment caused by the metal components inside the cable plug, existing temperature measurement devices are generally used on the surface of the black rubber protective cover outside the cable plug. This cannot actually measure the temperature inside the plug, and the temperature data has significant deviations, which is of little practical significance. Summary of the Invention

[0011] In response to the problems in the prior art of monitoring the plug temperature under high-pressure environments, such as inaccurate measurement and significant influence of environmental factors, the present invention designs a temperature measuring sensor device and a cable connector installation structure including the temperature measuring sensor device, with the aim of solving the problem of wireless temperature monitoring inside the cable plug of the ring network cabinet.

[0012] The technical solution adopted by this device is: a temperature measuring sensor device, including a nut, a temperature measuring label and an outer shell cover. The nut constitutes the main body of the temperature measuring sensor device. A groove is opened on the side of the nut, and a pair of mounting holes are provided on both sides of the groove plane. The temperature measuring label is placed in the groove. The width of the temperature measuring label is smaller than the distance between the left and right pairs of mounting holes, so that the mounting holes are exposed. An outer shell cover is provided on the outside of the groove. Mounting columns are connected on both sides of the outer shell cover. The outer shell cover is covered on the groove by inserting the mounting columns into the corresponding mounting holes.

[0013] Preferably, the temperature measurement tag consists of a chip, a radiation antenna, and a medium. The chip refers to a passive ultra-high frequency RFID chip with a temperature measurement function. The radiation antenna refers to an electromagnetic wave energy receiving and reflecting device connected between the RF+ and GND ends of the chip and can match the corresponding chip. The medium includes ceramics, PCB, and high-frequency board.

[0014] Preferably, one or more grooves are provided on the side surface of the nut, a temperature measuring label is fixed on each groove, and an outer shell cover is provided on the outside of each groove.

[0015] Preferably, the thickness of the nut is 7mm-10mm, the slot width of the nut is 5.5mm-7mm, the width of the temperature measuring label is 4mm-6mm, and the distance between the chip in the temperature measuring label and the side wall of the groove is 0mm-1mm.

[0016] Preferably, the angle between the main polarization direction of the temperature measuring label and the normal direction of the nut does not exceed 30 degrees, and the temperature measuring label is an anti-metal label with any dimension along the normal direction of the nut greater than or equal to 4 mm.

[0017] Preferably, the temperature measurement tag is a ceramic tag with a length*width=5mm*5mm and a dielectric constant between 140 and 180, or a ceramic tag with a length*width=10mm*5mm and a dielectric constant greater than 50.

[0018] The present application also includes a cable connector installation structure, including the above-mentioned temperature sensing device, screw, plug, metal cup, and copper nose. The metal cup is embedded in the plug, one end of the screw is inserted into the metal cup, and the other end extends to the outside of the plug. A copper nose is hung on the end of the screw away from the plug, and a temperature sensing device, a spring washer, an ordinary washer, a positioning gasket and several gaskets are sleeved on the screw.

[0019] Preferably, the spring gasket is an unclosed ring, the common gasket is a closed ring structure, and the positioning pad and the gasket are both hollow thin sheets with thickness.

[0020] Preferably, the positioning gasket is used to control the distance between the cup mouth of the metal cup body and the surface of the copper nose; the gasket is provided with 1-4, and the installation position can be freely set on the screw space between the metal cup body and the copper nose; the positioning gasket and gasket can be used alone or in any combination, and are both used to create an insulating gap between the cup edge of the metal cup body and the surface of the copper nose.

[0021] Preferably, by increasing the thickness of the ordinary gasket or spring gasket, the function of any gasket can be equivalently replaced, and by increasing the outer diameter of the ordinary gasket or spring gasket, the function of the positioning gasket can be equivalently replaced.

[0022] Compared with the existing technology, this device has the following beneficial effects: This application utilizes RFID radio frequency identification technology, combined with a temperature measuring chip, and the internal structure and electromagnetic environment of the ring network cabinet cable head, to provide a UHF frequency band temperature measuring RFID sensor device placed inside the cup space of the plug. The sensor device has the characteristics of small thickness, strong signal and no hidden danger of causing partial discharge. At the same time, a cable connector installation structure containing the sensor device is provided, thereby better solving the problem of wireless temperature monitoring inside the ring network cabinet cable plug. The placement direction of the temperature measuring sensor device in the plug can be arbitrarily selected, and its sensitivity is not greatly affected. After the installation is completed, the sensitivity margin of the temperature measuring sensor device exceeds 10dBm. In general, the product is easy to install and debug, has a simple structure, has no effect on the original installation structure of the ring network cabinet plug, and can be mass-produced and applied. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] FIG1 is a structural diagram of a temperature sensing device (single slot structure).

[0024] FIG2 is an installation structure diagram of the temperature sensing device of FIG1 installed on the ring network cabinet plug.

[0025] FIG3 is another representation of FIG2.

[0026] Among them, 1. Plug; 2. Metal cup; 3. Screw; 4. Copper nose; 5. Temperature sensor; 51. Nut; 52. Temperature label; 53. Shell cover; 54. Mounting column; 6. Spring washer; 7. Ordinary washer; 8. Positioning gasket; 9. Gasket. DETAILED DESCRIPTION

[0027] The embodiments of the present application will be described in detail below. Throughout this specification, identical or similar components and components having identical or similar functions are represented by similar reference numerals. The embodiments described herein with respect to the accompanying drawings are illustrative and diagrammatic and are intended to provide a basic understanding of the present application. The embodiments of the present application should not be construed as limiting the present application. In order to make the above-mentioned objects, features, and advantages of the present invention more clearly understood, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0028] This application relates to a UHF temperature-measuring RFID sensor device placed within the cup body of a plug (1). As shown in Figure 1, the device comprises a nut 51 with one or more grooves defined in its sidewall. Each groove houses a temperature tag 52. The temperature tag 52 consists of a chip, a radiating antenna, and a dielectric medium. The chip is a passive ultrahigh-frequency RFID chip with temperature measurement capabilities. The radiating antenna is a device that receives and reflects electromagnetic energy, connected between the chip's RF+ and GND pins, and is compatible with the corresponding chip. The dielectric medium typically includes ceramic, PCBs, high-frequency boards, and the like. The RFID temperature tag combines radio frequency identification (RFID) technology with a temperature sensor to monitor and record an object's temperature in real time. Specifically, the temperature sensor senses the object's temperature in real time and transmits the data to the RFID chip. The RFID chip transmits the temperature data to a reader / writer via wireless communication, which in turn uploads the data to a central server for storage and analysis. Holes are punched at both ends of each groove, and each groove is equipped with a housing 53 with mounting posts 54. The mounting posts 54 are inserted into the holes at both ends of the groove, so that the housing 53 is placed on the groove, completing the sealing and fixing of the temperature label 52. In this embodiment, the nut 51, which serves as the main body of the temperature sensing device 5, has a thickness of 7-8 mm, the groove defined by the nut 51 is 5.5-7 mm wide, and the embedded temperature label 52 is 4-6 mm wide. The distance between the embedded temperature label 52 and the adjacent side of the groove wall of the nut 51 is 0-1 mm.

[0029] Specifically, the number of grooves opened on the side wall of the nut 51 can be freely adjusted according to actual needs, and each groove is equipped with the same temperature measuring label 52 and is closed by an outer cover 53. Figure 1 shows a nut structure with a single-sided groove. Generally speaking, the more grooves opened, the more temperature measuring labels 52 are installed, which will improve the temperature measuring performance of the temperature measuring device to a certain extent. However, the increase in the number of grooves will lead to an increase in cost and will also reduce the strength of the nut 51. Therefore, in actual use, it is better to open a single-sided groove or a double-sided groove on the side wall of the nut 51. In this embodiment, the temperature measuring label 52 used is a temperature measuring label with a length * width = 5mm * 5mm and a dielectric constant between 140 and 180, or a temperature measuring label with a length * width = 10mm * 5mm and a dielectric constant greater than 50, or other sensor labels with a size greater than or equal to 4mm along the normal direction of the nut 51.

[0030] The present application also relates to a cable connector installation structure using the temperature sensing device 5 described above, as shown in Figures 2-3. The structure comprises a plug 1, a metal cup 2, a screw 3, a copper nose 4, a nut sensor 5, a spring washer 6, a conventional washer 7, a positioning washer 8, and a plurality of washers 9. The core of the installation structure is to install the nut sensor into the plug 1 of the ring network cabinet. First, the copper nose 4 is hung on one end of the screw 3 to complete the fixation of the two. From the other end of the screw 3, the conventional washer 7, the spring washer 6, the temperature sensing device 5, and the plug 1 are sequentially installed. Then, a certain number of washers are installed according to actual needs. The conventional washer 7 and the spring washer 6 are the fixing structure required for installing and fixing the temperature sensing device. The other washers are any insulating material with a certain thickness and a through hole that has a supporting function. They are mainly used to create an insulating gap between the cup edge of the metal cup 2 and the surface of the copper nose 4. The number and installation position of these washers can be set according to actual needs. The thickness of the conventional washer 7 and the spring washer 6 can also be increased to achieve the same effect as adding washers. It should be pointed out that these gaskets contain a positioning gasket 8, which is set at the cup mouth of the metal cup body 2 to control the distance between the cup mouth of the metal cup body 2 and the surface of the copper nose 4. The function of the positioning gasket 8 can also be equivalently replaced by increasing the diameter of the ordinary gasket 7 and the spring gasket 6.

[0031] The metal cup 2 in the ring main unit exhibits an antenna effect with distinct linear polarization characteristics. It effectively receives electromagnetic waves with a polarization direction parallel to the normal of the metal cup 2, while its reception of electromagnetic waves perpendicular to this polarization direction is very weak. Furthermore, the antenna effect is significant when a certain insulation gap is maintained between the rim of the metal cup 2 and the surface of the copper nose 4. However, the effect is weak when the rim of the metal cup 2 is in contact with the surface of the copper nose 4. The present invention utilizes the metal cup 2's inherent coupling effect on electromagnetic waves with a specific polarization direction to set the primary polarization direction of the built-in temperature tag 52 parallel to the normal direction of the nut 51 (within practical applications, the deviation angle is controlled within 30 degrees). This allows the temperature tag 52 to couple with the metal cup 2, transferring electromagnetic wave energy received by the metal cup 2 to the temperature tag 52 (since the nut 51 is positioned parallel to the metal cup 2, the normal direction of the nut 51 is the same as the normal direction of the metal cup 2). This changes the signal transmission pattern from collector antenna → obstacle (metal cup 2) → sensor to collector antenna → directional coupler (metal cup 2) → sensor. Previously, signal transmission was shielded by obstacles, resulting in a weak signal transmitted to the sensor, affecting measurement results. Using this temperature measurement device significantly improves the signal strength transmitted to the temperature tag 52.

[0032] On the other hand, existing nut-type sensors on the market generally have the problem of being too thick, with their actual thickness generally reaching more than 12 mm. The increased thickness creates a significant gap between the cup body of the embedded part of the plug 1 and the copper nose 4, and electromagnetic waves enter and exit the space inside the cup body through the gap, thereby achieving the purpose of the sensor being able to communicate with the receiving device. However, the increased nut thickness changes the original installation structure of the insulating plug 1, which may cause the protruding length of the screw 3 at the nut end to be too small, and then the plug 1 is difficult to tighten or after the plug 1 is tightened, the gap between its metal cup body 2 and the copper nose 4 is too large. The temperature sensing device 5 of the present invention is slotted on the side of a nut 51. Its slotted structure does not affect the integrity of the upper and lower fastening surfaces of the nut 51. A ceramic temperature measurement label 52 can be normally accommodated in the slot. This structural design significantly reduces the gap width requirement between the metal cup body 2 and the surface of the copper nose 4, thereby reducing the thickness of the nut 51 to within 8 mm, avoiding the risk of partial discharge caused by excessive gaps.

[0033] In summary, this invention, incorporating RFID radio frequency identification technology, solves the problem of wirelessly monitoring the temperature inside the RMU cable plug 1. The temperature sensor 5 can be positioned in any direction within the plug 1 without significantly affecting its sensitivity. Once fully installed, the sensor's sensitivity margin exceeds 10dBm. Overall, the product is easy to install and debug, boasts a simple structure, and has no impact on the existing installation structure of the RMU plug 1, making it suitable for mass production and application.

[0034] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be based on the scope defined by the claims.

[0035] The technical content and features of this application have been disclosed above. However, those skilled in the art may still make various substitutions and modifications based on the teachings and disclosures of this application without departing from the spirit of this application. Therefore, the scope of protection of this application should not be limited to the contents disclosed in the embodiments, but should include various substitutions and modifications that do not depart from this application and are covered by the claims of this patent application.

Claims

1. A temperature sensing device, characterized in that: It includes a nut, a temperature measuring label and an outer shell cover. The nut constitutes the main body of the temperature measuring sensor device. A groove is opened on the side of the nut. A pair of mounting holes are arranged on both sides of the groove plane. The temperature measuring label is placed in the groove. The width of the temperature measuring label is smaller than the distance between the left and right pairs of mounting holes, so that the mounting holes are exposed. An outer shell cover is arranged on the outer side of the groove. Mounting columns are connected on both sides of the outer shell cover. The outer shell cover is covered on the groove by inserting the mounting columns into the corresponding mounting holes.

2. The temperature measuring sensor device according to claim 1, characterized in that: The temperature measurement tag is composed of a chip, a radiating antenna, and a medium. The chip refers to a passive ultra-high frequency RFID chip with a temperature measurement function. The radiating antenna refers to an electromagnetic wave energy receiving and reflecting device connected to the RF+ and GND ends of the chip and can match the corresponding chip. The medium includes ceramics, PCB, and high-frequency board.

3. The temperature sensing device according to claim 1, characterized in that: One or more grooves are provided on the side of the nut, a temperature measuring label is fixed on each groove, and an outer shell cover is provided on the outside of each groove.

4. The temperature measuring sensor device according to claim 2, characterized in that: The thickness of the nut is 7mm-10mm, the slot width of the nut is 5.5mm-7mm, the width of the temperature measuring label is 4mm-6mm, and the distance between the chip in the temperature measuring label and one side of the groove side wall is 0mm-1mm.

5. The temperature measuring sensor device according to claim 2, characterized in that: The angle between the main polarization direction of the temperature measuring label and the normal direction of the nut does not exceed 30 degrees, and the temperature measuring label is an anti-metal label with any size along the normal direction of the nut greater than or equal to 4 mm.

6. The temperature measuring sensor device according to claim 5, characterized in that: The temperature measurement label is a ceramic label with a length*width=5mm*5mm and a dielectric constant between 140 and 180, or a ceramic label with a length*width=10mm*5mm and a dielectric constant greater than 50.

7. A cable connector installation structure, characterized in that: It comprises the temperature measuring sensor device as described in any one of claims 1 to 6, a screw, a plug, a metal cup body, and a copper nose, wherein the metal cup body is embedded in the plug, one end of the screw is inserted into the metal cup body, and the other end extends to the outside of the plug, a copper nose is hung on the end of the screw away from the plug, and a temperature measuring sensor device, a spring gasket, a common gasket, a positioning gasket and several gaskets are sleeved on the screw.

8. The cable connector installation structure according to claim 7, characterized in that: The spring gasket is an unclosed ring, the common gasket is a closed ring structure, and the positioning gasket and the gasket are both hollow sheets with thickness.

9. The cable connector installation structure according to claim 7, characterized in that: The positioning gasket is used to control the distance between the cup mouth of the metal cup body and the surface of the copper nose; the gasket is provided with 1-4, and the installation position can be freely set on the screw space between the metal cup body and the copper nose; the positioning gasket and gasket can be used alone or in any combination, and are both used to create an insulating gap between the cup edge of the metal cup body and the surface of the copper nose.

10. The cable connector installation structure according to claim 9, characterized in that: By increasing the thickness of a common gasket or a spring gasket, the function of any gasket can be equivalently replaced. By increasing the outer diameter of a common gasket or a spring gasket, the function of a positioning gasket can be equivalently replaced.

Images