Intelligent GIS terminal with built-in multi-point temperature monitoring

Abstract

The application provides an intelligent GIS terminal with built-in multi-point temperature monitoring, which ensures the accuracy and stability of cable GIS terminal measurement through internal multi-point temperature measurement and adopts a new signal transmission mode to improve the terminal operation reliability. The terminal is subjected to multi-point temperature detection by a temperature sensing element arranged in an epoxy sleeve and a temperature monitoring device connected with the temperature sensing element. The temperature sensing element comprises a temperature sensing contact, a stress cone holder and a temperature signal receiving antenna. The temperature sensing contact is sleeved on the cable core located on the inner cone insulator and is internally provided with at least one group of temperature sensors. The stress cone holder is arranged between the stress cone body and the tail pipe and is provided with a temperature sensor three. The temperature sensor and the temperature sensor three are electrically connected with the temperature signal receiving antenna. The temperature signal receiving antenna is connected with the temperature monitoring device through a data transmission line. The application is suitable for the field of power cable accessories.

Description

A smart GIS terminal with built-in multi-point temperature monitoring Technical Field

[0001] This invention relates to the field of power cable accessories, and more particularly to an intelligent GIS terminal with built-in multi-point temperature monitoring. Background Technology

[0002] With rapid social development and accelerating urbanization, the electricity demand in urban centers is increasing year by year. Building smart grids has become one of my country's important strategic tasks. As a crucial component of urban smart grids, the market demand for high-voltage cables is also growing rapidly, as is the demand for cable terminals. Because GIS terminals are enclosed inside gas-insulated boxes, subsequent inspections and maintenance become more difficult, making it impossible to monitor safety hazards at connection points between electrical equipment in real time. These safety hazards refer to electrical accidents caused by partial discharge due to cable insulation damage or poor core contact, leading to insulation breakdown, short circuits, and power outages in the affected area. These hazards typically manifest as abnormal heating at the fault point. Therefore, the industry uses the heating of relevant connection parts of electrical equipment to pinpoint the location of potential faults, achieving automated and intelligent monitoring of electrical equipment faults.

[0003] Chinese patent publication CN211347156U, entitled "A Temperature Measuring Inner Cone Plug-in Terminal," discloses a cable terminal including a sleeve. The invention comprises a rubber insulation assembly, a temperature measuring assembly, and a tailpipe system. The temperature measuring assembly includes a clamping cone, a bearing ring, a temperature measuring ring, and a contact sleeved on the clamping cone. An annular groove for mounting the temperature measuring ring is formed on the clamping cone. The bearing ring has a through hole in its center for the cable core to pass through. At least one material near the through hole in the bearing ring is a non-metallic material capable of transmitting electrical signals. An intelligent temperature measuring module is installed on the temperature measuring ring, enabling the intelligent temperature measuring module to transmit wireless signals to an external receiving device via the bearing ring. By implementing this technical solution, the existing technical difficulty in monitoring the temperature of pluggable inner cone terminals can be effectively solved, achieving accurate online monitoring of the cable core of pluggable inner cone terminals. Another Chinese patent, "A Novel Online Monitoring Device for High-Voltage Cable Terminals and Joints," patent number CN105699867A, provides a method of pre-embedding a sensor inside the stress cone during factory manufacturing. This allows for real-time measurement of heat changes at the stress cone location at the closest distance during cable monitoring, improving measurement sensitivity, accuracy, reliability, and anti-interference capabilities. Both of the above-mentioned solutions suffer from drawbacks such as single measurement points and unstable signal transmission. Cable terminals are composed of various components with different materials and structures, such as stress cones, stress cone insulators, and tailpipes. The temperature of different materials varies with the ambient temperature, making the detection data from a single temperature measurement point unreliable. Commonly used cable terminals typically connect directly to the sensor via optical fiber or transmit signals to an external detection system via a wireless signal transmitter built into the temperature measuring component. Both of these signal transmission methods are prone to failure, either due to excessively high contact point temperatures damaging the optical fiber cable or due to signal shielding caused by the terminal's internal insulation layer and metal structure, preventing the timely transmission of effective temperature information to the testing personnel. Ultimately, manual inspection is still required, which undoubtedly increases the maintenance costs and difficulty of the power equipment, and manual operation also carries considerable risks. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide an intelligent GIS terminal with built-in multi-point temperature monitoring that ensures the accuracy and stability of cable terminal measurement through multi-point temperature measurement and improves the reliability of terminal operation by adopting a brand-new signal transmission method.

[0005] The technical solution adopted in this invention is as follows: This invention includes a cable core, a tail tube sequentially sleeved at the head of the cable core, a stress cone, a stress cone body, and an epoxy sleeve. The epoxy sleeve covers the cable core, the stress cone, and the stress cone body, with one end connected to the tail tube and the other end provided with an inner cone insulator. It also includes a temperature sensing element disposed within the epoxy sleeve and a temperature monitoring device signal-connected to the temperature sensing element. The temperature sensing element includes a temperature-sensing contact, a stress cone support, and a temperature signal receiving antenna. The temperature-sensing contact is sleeved on the portion of the cable core located at the inner cone insulator and has at least one set of temperature sensors built into it. The stress cone support is disposed between the stress cone body and the tail tube, and a third temperature sensor is disposed on the stress cone support. Both the third and third temperature sensors are electrically connected to the temperature signal receiving antenna, which is connected to the temperature monitoring device via a data transmission line.

[0006] Furthermore, the temperature-sensing contact is made of the same material as the cable core and has a built-in through hole that matches the cable core. The temperature-sensing contact is fitted onto the cable core by pressing. A nylon baffle is also provided at the bottom of the inner cone insulator. At the junction of the nylon baffle and the end of the temperature-sensing contact, a placement groove is provided on the temperature-sensing contact at one end corresponding to the nylon baffle. The temperature sensor is installed in the placement groove.

[0007] Furthermore, two placement slots are provided on the temperature sensing contact, and the two placement slots are horizontally and symmetrically arranged inside the upper end of the temperature sensing contact. Temperature sensor one and temperature sensor two are arranged in the two placement slots.

[0008] Furthermore, the temperature-sensing contact is made of copper, and the first temperature sensor and the second temperature sensor are encapsulated in the placement groove by thermally conductive resin.

[0009] Furthermore, the end of the stress cone support is connected to the tail tube via a spring post, and a wiring port is provided on the tail tube, through which the data transmission line is connected to the temperature monitoring device.

[0010] Furthermore, the front end of the stress cone support is provided with a conical opening adapted to the stress cone body, and the middle section is provided with an inner groove. The temperature sensor is disposed in the inner groove. A gap is left between the stress cone support and the epoxy sleeve, and the temperature signal receiving antenna is disposed in the gap.

[0011] Furthermore, the front portion of both the temperature signal receiving antenna and the data transmission line connected to the temperature signal receiving antenna is integrally formed with the epoxy sleeve.

[0012] Furthermore, a second gap is provided between the stress cone body and the interior of the epoxy sleeve, and a fourth temperature sensor is also provided outside the stress cone body and located inside the second gap. The fourth temperature sensor is connected to the temperature signal receiving antenna.

[0013] Finally, a temperature sensor four is integrally formed inside the stress cone body, and the temperature sensor four is connected to the temperature signal receiving antenna.

[0014] Compared with existing technologies, the beneficial effects of this invention are as follows: This invention uses a temperature sensing element built into the epoxy sleeve to detect the temperature at multiple locations inside the cable terminal, such as the cable core portion used for external connection of electrical equipment within the inner cone insulator, the stress cone body portion, and inside the epoxy sleeve. By analyzing and comparing the temperature changes at these three locations, it can determine whether there are any abnormal temperature changes inside the GIS terminal, thus improving the accuracy and reliability of temperature detection. Furthermore, by incorporating a built-in temperature signal receiving antenna and connecting the temperature monitoring device to the temperature signal receiving antenna via a data transmission line, combining both wireless and wired data transmission methods, it avoids the possibility of the built-in temperature sensor signal being shielded by metal, improving the signal propagation stability of the product. Therefore, this invention ensures the accuracy and stability of cable terminal measurements through multi-point temperature measurement and improves the operational reliability of the terminal by employing a novel signal transmission method. Attached Figure Description

[0015] Figure 1 is a schematic diagram of the internal structure of the present invention;

[0016] Figure 2 is a schematic diagram of the internal structure of the temperature-sensing contact;

[0017] Figure 3 is a front cross-sectional view of the temperature-sensing contact.

[0018] Figure 4 is a schematic diagram of the assembly of the temperature signal receiving antenna described in Embodiment 1;

[0019] Figure 5 is a schematic diagram of the assembly of the temperature signal receiving antenna described in Embodiment 2;

[0020] Figure 6 is an assembly diagram of the temperature sensor four described in Embodiment 1;

[0021] Figure 7 is a schematic diagram of the assembly of temperature sensor four described in Embodiment 2. Detailed Implementation

[0022] As shown in Figures 1, 2, and 3, this invention patent proposes an intelligent GIS terminal with built-in multi-point temperature monitoring. The terminal's temperature monitoring can realize passive wireless temperature measurement and multi-point temperature monitoring inside the terminal, and has the advantages of low cost, simple installation and operation, and high temperature monitoring accuracy. The present invention includes a cable core 1, a tail tube 2, a stress cone 3, a stress cone body 4, and an epoxy sleeve 5 sequentially sleeved at the head of the cable core 1. The epoxy sleeve 5 encloses the cable core 1, the stress cone 3, and the stress cone body 4, and one end is connected to the tail tube 2, while the other end is provided with an inner cone insulator 6. The invention also includes a temperature sensing element disposed within the epoxy sleeve 5 and a temperature monitoring device 7 signal-connected to the temperature sensing element. The temperature sensing element includes a temperature-sensing contact 8, a stress cone support 9, and a temperature signal receiving antenna 10. The temperature-sensing contact 8 is sleeved on the portion of the cable core 1 located at the inner cone insulator 6 and has at least one set of temperature sensors built into it. The stress cone support 9 is disposed between the stress cone body 4 and the tail tube 2, and a temperature sensor 11 is disposed on the stress cone support 9. Both the temperature sensor and the temperature sensor 11 are electrically connected to the temperature signal receiving antenna 10. The temperature signal receiving antenna 10 is connected to the temperature monitoring device 7 via a data transmission line 12.

[0023] The temperature-sensing contact 8 is made of the same material as the cable core 1 and has a built-in through hole 13 that matches the cable core 1. The temperature-sensing contact 8 is fitted onto the cable core 1 by pressing. Specifically, after the temperature-sensing contact 8 is fitted onto the cable core 1, a crimping fixture is used to press and lock the temperature-sensing contact 8 onto the cable core 1. A nylon baffle 14 is also provided at the bottom of the inner cone insulator 6. At the end of the nylon baffle 14, where it connects to the end of the temperature-sensing contact 8, a placement groove 15 is provided on the temperature-sensing contact 8 corresponding to one end of the nylon baffle 14. The temperature sensor is installed in the placement groove 15. Two placement grooves 15 are provided on the temperature-sensing contact 8, and the two placement grooves 15 are horizontally symmetrically arranged in the upper part of the temperature-sensing contact 8. Temperature sensor 16 and temperature sensor 2 17 are provided in the two placement grooves 15. The temperature-sensing contact 8 is made of copper. The first temperature sensor 16 and the second temperature sensor 17 are encapsulated in the placement groove 15 with thermally conductive resin. The end of the stress cone support 9 is connected to the tail tube 2 via a spring post 21. A wiring port 22 is provided on the tail tube 2, and the data transmission line 12 is connected to the temperature monitoring device 7 through the wiring port 22.

[0024] As can be seen from the above scheme, the temperature sensing contact 8 is made of the same material as the cable core 1, and in this scheme, the temperature sensing contact 8 is made of copper. Thus, the temperature sensor 16 and the temperature sensor 17, built into the placement slot 15, are essentially in direct contact with the cable core 1, meaning the measured data is directly equivalent to the temperature of the cable core 1. Furthermore, since the two placement slots 15 are located at the ends of the temperature sensing contact 8, specifically between the contact surface of the cable core 1 and the contact surface of the epoxy sleeve 5, when the temperature sensor 16 and the temperature sensor 17 are placed in the placement slot 15, the signals from both sensors can pass through the nylon baffle 14 without being shielded by metal. Simultaneously, the temperature sensor 16 and the temperature sensor 17 are encapsulated in the placement slot 15 with thermally conductive resin, ensuring reliable installation while allowing the temperature signal to penetrate the resin material smoothly. Therefore, the temperature signals collected by the two sensors can be successfully received by the temperature signal receiving antenna 10.

[0025] As shown in Figures 4 and 6, in Embodiment 1, the stress cone support 9 has a conical opening 18 at its front end that matches the stress cone body 4, and an inner groove 19 in its middle section. The third temperature sensor 11 is disposed in the inner groove 19. A gap 20 is left between the stress cone support 9 and the epoxy sleeve 5, and the temperature signal receiving antenna 10 is disposed in the gap 20. A second gap 23 is provided between the stress cone body 4 and the interior of the epoxy sleeve 5. A fourth temperature sensor 24 is also disposed outside the stress cone body 4 within the second gap 23, and the fourth temperature sensor 24 is connected to the temperature signal receiving antenna 10. The third temperature sensor 11 and the second temperature sensor 24 are disposed on the inner groove 19 and the outer surface of the stress cone body 4 using an adhesive bonding process. This bonding is achieved by self-adhesive rubber with good compatibility with the materials of the stress cone body 4 and the stress cone support 9. This method does not require changes to the cable terminal structure or modifications to the component production molds, resulting in low production costs.

[0026] As shown in Figures 5 and 7, in Embodiment 2, the front portions of the temperature signal receiving antenna 10 and the data transmission line 12 connected to the temperature signal receiving antenna 10 are integrally formed with the epoxy sleeve 5. A temperature sensor 24 is integrally formed within the stress cone body 4, and the temperature sensor 24 is connected to the temperature signal receiving antenna 10. In this embodiment, assembly is achieved through a molding process. Specifically, during the injection molding of the stress cone body 4 and the epoxy sleeve 5 in the factory, the corresponding temperature sensor 24, the temperature signal receiving antenna 10, and the data transmission line 12 are directly embedded into the epoxy sleeve 5 and the stress cone body 4 for integral forming. This method eliminates the need for subsequent installation steps, provides good protection, effectively avoids metal locations inside the terminal, reduces the shielding effect of metal on the signal, and facilitates finding the optimal position for the antenna and sensor.

[0027] In this invention, temperature sensors 16, 17, 11, and 24 all utilize radio frequency electromagnetic field energy harvesting and data transmission, offering advantages such as small size and long transmission distance. The stress cone body 4 is made of rubber and is the core area of ​​the GIS terminal. By installing temperature sensor 24 in this area, the temperature of the stress cone 3 can be directly detected, allowing for the most direct assessment of its performance and installation defects based on temperature changes. The temperature sensor 311 is installed on the stress cone support 9, located within the space of the gap 20 inside the epoxy sleeve 5, and is used to monitor the internal temperature of the GIS terminal. In this invention, the inner diameter of the stress cone support 9 is larger than the diameter of the cable core 1. Therefore, there is a certain gap between the inner surface of the stress cone support 9 and the cable core 1. With the presence of the gap 20, the temperature of the stress cone support 9 will not change with the temperature changes of the epoxy sleeve 5 and the cable core 1. Therefore, the temperature information monitored by the temperature sensor 311 can accurately reflect the real-time temperature inside the GIS terminal. By comparing the data of the temperature sensor 311 and the temperature sensor 424, it can be determined whether there is an abnormal temperature rise at the position of the stress cone 3.

[0028] In this invention, the temperature monitoring device 7 consists of a temperature acquisition host, a power supply module, and a communication module. The temperature acquisition host converts analog data collected by the temperature sensor into digital data and transmits the data to the monitoring platform via RS485 / fiber optic / 4G interfaces of the communication module for GIS terminal temperature monitoring. This invention achieves multi-point temperature monitoring within the terminal by installing passive wireless temperature sensors through the temperature-sensing contact 8, the stress cone body 4, and the stress cone support 9. The integrated installation structure design of temperature sensor 16 and temperature sensor 17 with the temperature-sensing contact 8 avoids changes to the internal structure and installation process of the terminal, solves the difficulty of internal temperature sensor installation, and avoids the impact of structural changes on the internal electric field distribution of the terminal. The integrated molding process design of the temperature signal receiving antenna 10 and the epoxy sleeve 5 reduces installation difficulty, improves the temperature signal reception strength, and avoids the influence of metal installed inside the terminal on the signal. The integrated molding process design of temperature sensor 24 and the stress cone body 4 reduces installation difficulty and improves the reliability and stability of sensor installation. Ultimately, the goal is to achieve an intelligent GIS terminal that integrates temperature sensing elements and can perform multi-point temperature measurements inside cables, possessing accuracy, safety, reliability, and stability.

[0029] Finally, it should be emphasized that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A smart GIS terminal with built-in multi-point temperature monitoring, comprising a cable core (1), a tail tube (2) sequentially sleeved at the head of the cable core (1), a stress cone (3), a stress cone body (4), and an epoxy sleeve (5), wherein the epoxy sleeve (5) covers the cable core (1), the stress cone (3), and the stress cone body (4), and one end is connected to the tail tube (2), and the other end is provided with an inner cone insulator (6), characterized in that: It also includes a temperature sensing element disposed within the epoxy bushing (5) and a temperature monitoring device (7) connected to the temperature sensing element. The temperature sensing element includes a temperature sensing contact (8), a stress cone support (9), and a temperature signal receiving antenna (10). The temperature sensing contact (8) is sleeved on the part of the cable core (1) located on the inner cone insulator (6) and has at least one set of temperature sensors built in. The stress cone support (9) is disposed between the stress cone body (4) and the tail tube (2) and a temperature sensor is provided on the stress cone support (9). Temperature sensor three (11), both the temperature sensor and the temperature sensor three (11) are electrically connected to the temperature signal receiving antenna (10), the temperature signal receiving antenna (10) is connected to the temperature monitoring device (7) through the data transmission line (12); the temperature sensing contact (8) is made of the same material as the cable core (1) and has a through hole (13) adapted to the cable core (1) built in. The temperature sensing contact (8) is fitted onto the cable core (1) by pressing, at the bottom of the inner cone insulator (6). A nylon baffle (14) is also provided. At the junction of the nylon baffle (14) and the end of the temperature-sensing contact (8), a placement groove (15) is provided on the temperature-sensing contact (8) at one end corresponding to the nylon baffle (14). The temperature sensor is installed in the placement groove (15). Two placement grooves (15) are provided on the temperature-sensing contact (8). The two placement grooves (15) are horizontally symmetrically arranged in the upper end of the temperature-sensing contact (8). Temperature sensor one (16) and temperature sensor two (17) are provided in the two placement grooves (15). 17); A gap (20) is left between the stress cone support (9) and the epoxy sleeve (5), and the temperature signal receiving antenna (10) is set in the gap (20); the front part of the temperature signal receiving antenna (10) and the data transmission line (12) connected to the temperature signal receiving antenna (10) are integrally formed with the epoxy sleeve (5); a temperature sensor four (24) is integrally formed in the stress cone body (4), and the temperature sensor four (24) is connected to the temperature signal receiving antenna (10).

2. The intelligent GIS terminal with built-in multi-point temperature monitoring according to claim 1, characterized in that: The temperature-sensing contact (8) is made of copper, and the temperature sensor one (16) and the temperature sensor two (17) are encapsulated in the placement groove (15) by thermally conductive resin.

3. The intelligent GIS terminal with built-in multi-point temperature monitoring according to claim 2, characterized in that: The end of the stress cone support (9) is connected to the tail tube (2) via a spring column (21). A wiring port (22) is provided on the tail tube (2). The data transmission line (12) is connected to the temperature monitoring device (7) via the wiring port (22).

4. A smart GIS terminal with built-in multi-point temperature monitoring according to any one of claims 1-3, characterized in that: The front end of the stress cone support (9) is provided with a conical opening (18) that is adapted to the stress cone body (4), and the middle section is provided with an inner groove (19). The temperature sensor (11) is located in the inner groove (19).

5. A smart GIS terminal with built-in multi-point temperature monitoring according to any one of claims 1-3, characterized in that: A gap two (23) is provided between the stress cone body (4) and the epoxy sleeve (5). A temperature sensor four (24) is also provided outside the stress cone body (4) and inside the gap two (23). The temperature sensor four (24) is connected to the temperature signal receiving antenna (10).

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