Built-in partial discharge and temperature monitoring intelligent cable joint

Abstract

The application provides a built-in partial discharge and temperature monitoring intelligent cable joint with high universality, good monitoring efficiency and accuracy, integrated partial discharge and temperature detection, and effective avoidance of signal transmission shielding. The cable joint comprises a joint body, two cable cores connected to the joint body, a shielding cover and an insulation layer sequentially wrapped on the cable cores from inside to outside, a metal protective shell arranged outside the joint body, an integrated partial discharge and temperature sensor arranged in the joint body, and a signal receiving antenna. The integrated partial discharge and temperature sensor is internally provided with a power taking ring and a signal output antenna, and is electrically connected to the signal receiving antenna through the signal output antenna. The signal receiving antenna is arranged between the joint body and the metal protective shell. A monitoring device is arranged outside the joint body and connected to the signal receiving antenna through a data transmission line. The application is suitable for the field of power cable accessories.

Description

Technical Field

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

[0002] With rapid societal development and accelerating urbanization, the electricity needs of urban centers are increasing year by year. Building smart grids has become a crucial strategic task for my country, and underground cables are gradually becoming an important component of urban power grids. Accurately monitoring the real-time operating status of cables is beneficial for improving the reliability of the power grid. Real-time cable temperature and partial discharge values ​​are key parameters for measuring cable operating status. Conventional cable joint products lack temperature and partial discharge monitoring functions, making it impossible to monitor the temperature and partial discharge of high-voltage cable joints and cable lines during operation. Inspections can only be conducted manually. However, since joints are often located in cable trenches or directly buried underground, the effectiveness of manual inspections is significantly reduced. Chinese patent application number 202110741198.9, entitled "Cable Joint," discloses a device that can accurately measure cable operating parameters without affecting the electrical performance of the cable joint. This device places a temperature sensor inside the cable shield, with a probe contacting the cable core to detect its temperature. A capacitive sensor for detecting partial discharge signals is located outside the shield. While this design can obtain temperature and partial discharge data for the corresponding core of the cable joint, the separate design of the two sets of sensors, installed in different locations, undoubtedly increases the installation difficulty and operating cost of the device. Another patent application... The patent application "An Integrated Intelligent Temperature Measuring Arm with Self-Powered Wireless Transmission" (application number: 202011180502.9) proposes a design that embeds a temperature sensor inside the arm to detect the temperature of the contact area between the arm and the contact head, and simultaneously uses wireless transmission to transmit the collected temperature information to an external monitoring device. However, this design, which embeds both the wireless transmission chip and the temperature sensor inside the arm, is prone to interference and shielding from the insulation layer, shielding cover, and metal structure inside the contact head, making it impossible to transmit the collected temperature signal to the external monitoring device. Furthermore, the installation method in this solution requires creating a groove at the contact head, which increases the cost of using the product and also limits its versatility. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a smart cable connector with built-in partial discharge and temperature monitoring that is highly versatile, has good monitoring efficiency and accuracy, integrates partial discharge and temperature detection, and effectively avoids signal transmission shielding.

[0004] The technical solution adopted in this invention is as follows: This invention includes a connector body, two cable cores connected within the connector body, and a shield and an insulation layer sequentially wrapped around the cable cores from the inside out. A metal protective shell is also provided on the outside of the connector body. A partial discharge temperature integrated sensor and a signal receiving antenna are provided inside the connector body. A notch in the shield is provided at the connection position of the two cable cores. The partial discharge temperature integrated sensor is sleeved on the cable core and placed in the notch in the shield. The partial discharge temperature integrated sensor has a built-in power-taking ring and a signal output antenna, and is electrically connected to the signal receiving antenna through the signal output antenna. The signal receiving antenna is located between the connector body and the metal protective shell. A monitoring device is also provided outside the connector body, and the monitoring device is connected to the signal receiving antenna through a data transmission line.

[0005] Furthermore, the integrated partial discharge temperature sensor is a ring design, including an insulating shell and a magnetic ring coil, a temperature sensor, a power-taking circuit, and a data transmission circuit disposed within the insulating shell. The magnetic ring coil and the power-taking ring are stacked together with an insulating partition between them. The signal output antenna is stacked on the other side of the magnetic ring coil corresponding to the power-taking ring. The temperature sensor is electrically connected to the signal output antenna through the data transmission circuit, and the power-taking ring is electrically connected to the data transmission circuit through the power-taking circuit.

[0006] Furthermore, the temperature sensor and the power-collecting circuit are respectively located on both sides of the insulating partition and are tangentially arranged with the power-collecting ring and the magnetic ring coil, and the data transmission circuit is located on the inner wall of the insulating shell.

[0007] Furthermore, the insulating partition is integrally formed with the insulating shell, the diameter of the power-taking ring and the magnetic ring coil is smaller than that of the insulating shell, and the insulating partition divides the interior of the insulating shell into two sets of placement cavities, in which the temperature sensor, the data transmission circuit and the power-taking circuit are disposed.

[0008] Furthermore, an insulating mounting block is provided on the notch of the shielding cover. The insulating mounting block has a built-in groove that is compatible with the integrated partial discharge temperature sensor, and the integrated partial discharge temperature sensor is pressed tightly onto the cable core.

[0009] Furthermore, the insulating mounting block is injection molded from heat-resistant resin material.

[0010] Furthermore, the monitoring device includes a data acquisition host, a power supply module, and a communication module. The data acquisition host is connected to the signal receiving antenna via the data transmission line, and the power supply module is connected to an external power source.

[0011] Furthermore, the communication module is connected to external monitoring equipment via RS485 communication, 4G communication, or fiber optic communication.

[0012] Finally, the metal protective shell is made of copper and has a connector that is compatible with the data transmission line.

[0013] Compared with existing technologies, the beneficial effects of this invention are as follows: This invention solves the problems of inability to directly measure the internal temperature of cable joints, inability to monitor partial discharge signals in cable lines, and inability to monitor partial discharge signals in cable joints during operation by using the integrated partial discharge temperature sensor, the signal output antenna disposed within the integrated partial discharge temperature sensor, and the power-taking ring. The integrated partial discharge temperature sensor adopts a ring design and is directly fitted onto the cable core, without changing the original joint installation method, and is basically consistent with the original cable structure, effectively improving versatility. Furthermore, by using the power-taking ring in conjunction with the signal output antenna and the signal receiving antenna, and employing a self-powered wireless transmission power supply and communication method, the structural problem of difficult wired connections within the joint body is solved. Simultaneously, the data transmission line connects the signal receiving antenna and the monitoring device, solving the problem of signal shielding by the metal protective shell, thus improving the accuracy, safety, and reliability of measuring the internal core temperature and partial discharge of the cable joint. Therefore, this invention has high versatility, good monitoring efficiency and accuracy, integrated detection of partial discharge and temperature, and effectively avoids signal transmission shielding. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the internal structure of the present invention;

[0015] Figure 2 yes Figure 1 Enlarged diagram of A in the middle;

[0016] Figure 3 This is a schematic diagram of the structure of the integrated partial discharge temperature sensor. Detailed Implementation

[0017] like Figure 1 , Figure 2 and Figure 3As shown, the present invention includes a connector body 1, two cable cores 2 connected within the connector body 1, and a shielding cover 3 and an insulating layer 4 sequentially covering the cable cores 2 from the inside out. A metal protective shell 5 is also provided on the outside of the connector body 1. A partial discharge temperature integrated sensor 6 and a signal receiving antenna 7 are provided inside the connector body 1. A shielding cover notch 8 is provided at the connection position of the two cable cores 2. The partial discharge temperature integrated sensor 6 is sleeved on the cable cores 2 and placed in the shielding cover notch 8. The partial discharge temperature integrated sensor 6 has a built-in power taking ring 61 and a signal output antenna 62, and is electrically connected to the signal receiving antenna 7 through the signal output antenna 62. The signal receiving antenna 7 is disposed between the connector body 1 and the metal protective shell 5. A monitoring device 9 is also provided outside the connector body 1. The monitoring device 9 is connected to the signal receiving antenna 7 through a data transmission line 10. In this embodiment, the signal receiving antenna 7 is adhered to the outer surface of the connector body 1 with insulating adhesive. The connector body 1 is injection molded from rubber. The signal receiving antenna 7 can also be installed in an embedded manner, that is, the signal receiving antenna 7 is pre-embedded in the connector body 1 during injection molding. Traditional partial discharge monitoring methods can only monitor partial discharge occurring at the cable joint by detecting the current pulse signal flowing through the grounding cable section, and the obtained data is not accurate. In this invention, the integrated partial discharge temperature sensor 6 is directly installed on the cable core 2 and measures at the contact point with the surface of the cable core 2. This partial discharge signal may come from the cable joint or other parts of the cable line, which can more effectively monitor the partial discharge signal occurring throughout the entire cable line, and also measure the discharge signal inside the connector body 1. Therefore, the partial discharge signal and temperature signal monitored by this invention are more accurate.

[0018] In this embodiment, the integrated partial discharge temperature sensor 6 is a ring design, including an insulating shell 63 and a magnetic ring coil 64, a temperature sensor 65, a power extraction circuit 66, and a data transmission circuit 67 disposed within the insulating shell 63. The magnetic ring coil 64 and the power extraction ring 61 are stacked together, with an insulating partition 68 between them. The signal output antenna 62 is stacked on the other side of the magnetic ring coil 64 corresponding to the power extraction ring 61. The temperature sensor 65 is electrically connected to the signal output antenna 62 through the data transmission circuit 67, and the power extraction ring 61 is electrically connected to the data transmission circuit 67 through the power extraction circuit 66.

[0019] In this invention, the temperature sensor 65 and the power-taking circuit 66 are respectively disposed on both sides of the insulating partition 68 and tangentially disposed with the power-taking ring 61 and the magnetic ring coil 64. The data transmission circuit 67 is disposed on the inner sidewall of the insulating shell 63. The insulating partition 68 is integrally formed with the insulating shell 63. The diameter of the power-taking ring 61 and the magnetic ring coil 64 is smaller than that of the insulating shell 63. The insulating partition 68 divides the interior of the insulating shell 63 into two sets of placement cavities 69. The temperature sensor 65, the data transmission circuit 67, and the power-taking circuit 66 are disposed in the placement cavities 69. An insulating mounting block 11 is also provided on the shielding cover notch 8. The insulating mounting block 11 has an internal groove adapted to the integrated partial discharge temperature sensor 6 and presses the integrated partial discharge temperature sensor 6 onto the cable core 2. The insulating mounting block 11 is injection molded from heat-resistant resin material. The monitoring device 9 includes a data acquisition host, a power supply module, and a communication module. The data acquisition host is connected to the signal receiving antenna 7 via the data transmission line 10, and the power supply module is connected to an external power source. The communication module connects to external monitoring equipment using RS485, 4G, or fiber optic communication. The metal protective shell 5 is made of copper and has a connector 12 adapted to the data transmission line 10.

[0020] In this invention, the power-taking ring 61 is made of silicon steel alloy and processed into a ring shape using a special process. When the AC-current-carrying cable core 2 passes through the power-taking ring 61, the power-taking ring 61 senses the magnetic field around the cable core 2 and induces electrical energy. The obtained electrical energy is supplied to the data transmission circuit 67 through the power-taking circuit 66. The insulating mounting block 11 is injection molded from heat-resistant resin material, which does not affect the heat detection effect of the temperature sensor 65, nor does it hinder the signal output antenna 62 from transmitting the signal to the signal receiving antenna 7. The magnetic ring coil 64 is different from the clamp-type structure of the external partial discharge sensor. It adopts a ring-shaped through-core structure and is insulated and encapsulated with high magnetic flux material. The overall size is small, and it can be internally installed without changing the original structure of the connector body 1. Real-time monitoring of partial discharge is achieved by monitoring the pulse current when the cable core 2 passing through the center of the magnetic ring coil 64 experiences partial discharge. In this invention, data transmission is achieved through a combination of wired and wireless methods, preventing the data collected by the integrated partial discharge temperature sensor 6 located within the connector body 1 from being shielded, thus ensuring the effective data transmission of the invention. The monitoring device 9, composed of a data acquisition host, power supply module, and communication module, is installed outside the cable connector and wiredly connected to the data receiving antenna inside the cable connector. It converts the received temperature and partial discharge data from analog to digital quantities and transmits the data to the monitoring platform via RS485 / 232 / 4G / fiber optic communication methods for monitoring cable core temperature and cable line partial discharge.

[0021] 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 cable connector with built-in partial discharge and temperature monitoring, comprising a connector body (1), two cable cores (2) connected within the connector body (1), and a shielding cover (3) and an insulation layer (4) sequentially covering the cable cores (2) from the inside out, wherein a metal protective shell (5) is also provided on the outside of the connector body (1), characterized in that: A partial discharge temperature integrated sensor (6) and a signal receiving antenna (7) are provided inside the connector body (1). A shielding notch (8) is provided at the connection position of the two sections of the cable core (2). The partial discharge temperature integrated sensor (6) is sleeved on the cable core (2) and placed in the shielding notch (8). The partial discharge temperature integrated sensor (6) has a built-in power taking ring (61) and a signal output antenna (62), and is electrically connected to the signal receiving antenna (7) through the signal output antenna (62). The signal receiving antenna (7) is located between the connector body (1) and the metal protective shell (5). A monitoring device (9) is also provided outside the connector body (1). The monitoring device (9) is connected to the signal receiving antenna (7) through a data transmission line (10). An insulating mounting block (11) is also provided on the shielding cover notch (8). The insulating mounting block (11) has an internal groove that is compatible with the integrated partial discharge temperature sensor (6), and the integrated partial discharge temperature sensor (6) is pressed and installed on the cable core (2). The partial discharge temperature integrated sensor (6) is a ring design, including an insulating shell (63) and a magnetic ring coil (64), a temperature sensor (65), a power-taking circuit (66) and a data transmission circuit (67) disposed in the insulating shell (63). The magnetic ring coil (64) and the power-taking ring (61) are stacked together and an insulating partition (68) is provided between them. The temperature sensor (65) and the power-taking circuit (66) are respectively disposed on both sides of the insulating partition (68) and are tangentially disposed with the power-taking ring (61) and the magnetic ring coil (64). The data transmission circuit (67) is disposed on the inner wall of the insulating shell (63).

2. The intelligent cable connector with built-in partial discharge and temperature monitoring according to claim 1, characterized in that: The signal output antenna (62) is stacked on the other side of the magnetic ring coil (64) corresponding to the power-taking ring (61). The temperature sensor (65) is electrically connected to the signal output antenna (62) through the data transmission circuit (67). The power-taking ring (61) is electrically connected to the data transmission circuit (67) through the power-taking circuit (66).

3. The intelligent cable connector with built-in partial discharge and temperature monitoring according to claim 2, characterized in that: The insulating partition (68) is integrally formed with the insulating shell (63). The diameters of the power-taking ring (61) and the magnetic ring coil (64) are smaller than those of the insulating shell (63). The insulating partition (68) divides the interior of the insulating shell (63) into two sets of placement cavities (69). The temperature sensor (65), the data transmission circuit (67), and the power-taking circuit (66) are disposed in the placement cavity (69).

4. The intelligent cable connector with built-in partial discharge and temperature monitoring according to claim 3, characterized in that: The insulating mounting block (11) is injection molded from heat-resistant resin material.

5. The intelligent cable connector with built-in partial discharge and temperature monitoring according to claim 4, characterized in that: The monitoring device (9) includes a data acquisition host, a power supply module and a communication module. The data acquisition host is connected to the signal receiving antenna (7) through the data transmission line (10), and the power supply module is connected to an external power source.

6. The intelligent cable connector with built-in partial discharge and temperature monitoring according to claim 5, characterized in that: The communication module is connected to external monitoring equipment via RS485 communication, 4G communication, or fiber optic communication.

7. A smart cable connector with built-in partial discharge and temperature monitoring according to claim 6, characterized in that: The metal protective shell (5) is made of copper and has a connector (12) that is compatible with the data transmission line (10).

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