Device and method for measuring temperature of buried cable joint

Abstract

The invention provides a buried cable joint temperature measuring device and measuring method. The buried cable joint temperature measuring device comprises at least one temperature sensor, the temperature sensor is buried underground, and the temperature sensor is attached to the outer surface of an insulating layer of a cable joint buried underground so that the temperature sensor can collect temperature data of the insulating layer of the cable joint; the wireless remote transmission device is located on the ground and comprises a conversion circuit board and an antenna, the temperature sensor is connected with the conversion circuit board through a first cable, the conversion circuit board is connected with the antenna, and the antenna is connected with the wireless remote transmission device. And the antenna is matched with the conversion circuit board so as to send temperature data measured by the temperature sensor to a control center. According to the buried cable joint temperature measuring device provided by the invention, temperature monitoring and alarming can be carried out on buried cable joints which are being constructed and already constructed.

Description

Technical Field

[0001] The present invention relates to the technical field of temperature measurement of cable joints, and particularly relates to a buried cable joint temperature measurement device and a measurement method. Background Art

[0002] Buried cables are very common in the process of modern urbanization, especially in wind farms and photovoltaic farms, where a large number of underground power cables are required, and many of these cables need to be connected by cable joints. Fault problems caused by high temperature in cable joints are random and difficult to predict. After a fault occurs, operation and maintenance personnel need to spend a lot of time and energy to repair the cable joints and restore power, which also causes economic losses. In related technologies, by installing a built-in temperature detector and then restoring multiple layers of protection in a winding manner with different materials layer by layer. This method is only applicable to temperature monitoring of cable joints during construction, and the operation is complex and the maintenance is difficult. It is very difficult to install this device after the cable is laid. However, there are a large number of buried cable joints that have been constructed in existing wind farms and photovoltaic power plants. How to monitor the temperature of buried cable joints in real time is a major problem that needs to be solved urgently. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems in the related technologies to some extent. To this end, an embodiment of the present invention provides a buried cable joint temperature measurement device and a measurement method.

[0004] The buried cable joint temperature measurement device according to the embodiment of the present invention includes:

[0005] At least one temperature sensor, which is buried underground and is attached to the outer surface of the insulating layer of the cable joint buried underground, so that the temperature sensor can collect the temperature data of the insulating layer of the cable joint;

[0006] A wireless remote transmission device, which is located on the ground. The wireless remote transmission device includes a conversion circuit board and an antenna. The temperature sensor is connected to the conversion circuit board through a first cable. The conversion circuit board is connected to the antenna, and the antenna cooperates with the conversion circuit board to send the temperature data measured by the temperature sensor to a control center.

[0007] In some embodiments, the buried cable joint temperature measurement device includes a fixing device, which is located directly above the cable joint, and the wireless remote transmission device is arranged on the fixing device.

[0008] In some embodiments, the fixing device includes a fixing pipe which extends in the vertical direction and is fixed on the ground. Flanges are provided at the top of the fixing pipe and the bottom of the wireless remote transmission device, and the fixing pipe and the wireless remote transmission device are connected by bolts passing through the flanges on the fixing pipe and the flanges on the wireless remote transmission device.

[0009] In some embodiments, there are multiple temperature sensors which are arranged at intervals in the circumferential direction on the outer surface of the insulating layer of the cable joint, and / or multiple temperature sensors are arranged at intervals in the length direction of the cable joint on the outer surface of the insulating layer of the cable joint.

[0010] In some embodiments, multiple temperature sensors are arranged at intervals in the circumferential direction on the outer surface of the insulating layer of the cable joint, and multiple temperature sensors are symmetrically arranged on the outer surface of the insulating layer of the cable joint.

[0011] In some embodiments, the temperature sensor has a measurement surface for fitting with the cable joint, and the measurement surface is an arc surface adapted to the outer surface of the insulating layer of the cable joint.

[0012] In some embodiments, the first cable is an armored cable;

[0013] The temperature sensor is a surface mount resistance temperature sensor;

[0014] A battery is provided in the wireless remote transmission device, and the battery is used to supply power to at least one of the temperature sensor, the conversion circuit board and the antenna.

[0015] In some embodiments, a display meter is provided on the wireless remote transmission device. The display meter is connected to the conversion circuit board, and the display meter is used to display the temperature measured by the temperature sensor.

[0016] In some embodiments, the display meter is used to display the highest temperature data measured by multiple temperature sensors.

[0017] The present invention also proposes a measurement method using the above-mentioned buried cable joint temperature measurement device, including the following steps: Dig out the soil, attach at least one temperature sensor to the outer surface of the insulating layer of the cable joint, cover the cable joint and the temperature sensor with soil, install the wireless remote transmission device on the ground, and use the wireless remote transmission device to send the temperature data measured by the temperature sensor to the control center.

[0018] The beneficial effects of the present invention are as follows: The buried cable joint temperature measurement device according to the embodiments of the present invention can attach a temperature sensor to the outer surface of the insulating layer of the cable joint buried underground, so that the temperature sensor can measure the temperature of the insulating layer of the cable joint 2 buried underground. This detection method can not only make the temperature sensor in full contact with the cable joint to be measured, but also be convenient to detach and easy to repair. Brief Description of the Drawings

[0019] Figure 1 is a schematic diagram of a buried cable joint temperature measurement device according to an embodiment of the present invention.

[0020] Reference Numerals: 1, temperature sensor; 2, cable joint; 3, first cable; 4, ground; 5, fixed pipe; 6, flange; 7, bolt; 8, battery; 9, housing; 10, antenna; 11, display meter. Detailed Embodiments

[0021] Embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the drawings. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0022] The buried cable joint temperature measurement device according to an embodiment of the present invention will be described below with reference to the drawings. As Figure 1 shown, the buried cable joint temperature measurement device according to an embodiment of the present invention includes at least one temperature sensor 1 and a wireless remote transmission device.

[0023] The temperature sensor 1 is buried underground, and the temperature sensor 1 is attached to the outer surface of the insulating layer of the cable joint 2 buried underground, so that the temperature sensor 1 can collect temperature data of the insulating layer of the cable joint 2.

[0024] Optionally, the temperature sensor 1 is a chip resistor temperature sensor. The resistance value of the chip resistor temperature sensor can change significantly with temperature. The temperature of the outer surface of the insulating layer of the cable joint 2 can be determined according to the change in the resistance value of the chip resistor temperature sensor, so as to judge whether the temperature of the cable joint 2 is higher than the ambient temperature.

[0025] The wireless remote transmission device is located on the ground. The wireless remote transmission device includes a conversion circuit board and an antenna 10. The temperature sensor 1 is connected to the conversion circuit board through a first cable 3. The conversion circuit board is connected to the antenna 10. The antenna 10 cooperates with the conversion circuit board to transmit the temperature data measured by the temperature sensor 1 to the control center. Specifically, the wireless remote transmission device transmits the collected resistance data to the signal conversion circuit board, and the conversion circuit board processes the data and then transmits the signal in the form of a wireless narrowband Internet of Things. The first cable 3 is an armored cable to increase the service life of the first cable 3. For example, the wireless remote transmission device can transmit the signal to a remote control room (control center) through Internet of Things methods such as NB-IoT (Narrowband Internet of Things) or LoRa (Long Range, Low Power Communication). Both NB-IoT (Narrowband Internet of Things) and LoRa (Long Range, Low Power Communication) are low-power wide-area Internet of Things. The first cable 3 can also use cables such as bus cables and optical fibers.

[0026] The buried cable joint temperature measurement device according to the embodiment of the present invention can attach the temperature sensor 1 to the outer surface of the insulating layer of the cable joint 2 buried underground, so that the temperature sensor 1 can measure the temperature of the insulating layer of the cable joint 2 buried underground. This detection method can not only make the temperature sensor 1 fully contact the cable joint 2 to be measured, but also be convenient to detach and easy to overhaul. Compared with setting a temperature measurement device inside the cable joint, the buried cable joint temperature measurement device according to the embodiment of the present invention does not damage the insulation and shielding structure of the original cable joint. The temperature sensor 1 can be directly attached to the outer surface of the insulating layer of the cable joint 2 that has been constructed and buried underground, so as to monitor the temperature of the cable joint 2 buried underground.

[0027] The wireless remote transmission device is located on the ground. The conversion circuit board and the antenna 10 of the wireless remote transmission device can transmit the temperature data measured by the temperature sensor 1 to the control center, so as to facilitate remote temperature monitoring of the cable joint 2 buried underground, and the wireless transmission method can reduce the difficulty of equipment installation.

[0028] As Figure 1 shown, in some embodiments, the buried cable joint 2 temperature measurement device includes a fixing device. The fixing device is located directly above the cable joint 2, and the wireless remote transmission device is arranged on the fixing device. Specifically, the fixing device includes a fixing pipe 5. The fixing pipe 5 extends in the up and down direction, and the fixing pipe 5 is fixed on the ground 4. The first cable 3 passes through the fixing pipe 5. Flanges 6 are provided at the top of the fixing pipe 5 and the bottom of the wireless remote transmission device. The fixing pipe 5 and the wireless remote transmission device are connected by bolts 7 passing through the flanges 6 on the fixing pipe 5 and the flanges 6 on the wireless remote transmission device. For example, the fixing pipe 5 is fixed to the ground by materials such as cement to support the wireless remote transmission device.

[0029] As Figure 1As shown, in some embodiments, there are multiple temperature sensors 1. The multiple temperature sensors 1 are arranged at intervals in the circumferential direction on the outer surface of the insulating layer of the cable joint 2, and / or the multiple temperature sensors 1 are arranged at intervals in the length direction of the cable joint 2 on the outer surface of the insulating layer of the cable joint 2.

[0030] Specifically, the multiple temperature sensors 1 being arranged at intervals in the circumferential direction on the outer surface of the insulating layer of the cable joint 2, and / or the multiple temperature sensors 1 being arranged at intervals in the length direction of the cable joint 2 on the outer surface of the insulating layer of the cable joint 2 includes: a. The multiple temperature sensors 1 are arranged at intervals in the circumferential direction on the outer surface of the insulating layer of the cable joint 2, so as to perform temperature monitoring on multiple positions on the outer surface of the insulating layer of the cable joint 2 in the circumferential direction; b. The multiple temperature sensors 1 are arranged at intervals in the length direction of the cable joint 2 on the outer surface of the insulating layer of the cable joint 2, so as to perform temperature monitoring on multiple positions on the outer surface of the insulating layer of the cable joint 2 in the length direction of the cable joint 2; c. The multiple temperature sensors 1 are arranged at intervals in the circumferential direction on the outer surface of the insulating layer of the cable joint 2, and the multiple temperature sensors 1 are arranged at intervals in the length direction of the cable joint 2 on the outer surface of the insulating layer of the cable joint 2.

[0031] In some embodiments, the multiple temperature sensors 1 are arranged at intervals in the circumferential direction on the outer surface of the insulating layer of the cable joint 2, and the multiple temperature sensors 1 are symmetrically arranged on the outer surface of the insulating layer of the cable joint 2. For example, two temperature sensors 1 are symmetrically arranged on both sides of the outer surface of the insulating layer of the cable joint 2.

[0032] In some embodiments, the temperature sensor 1 has a measurement surface for fitting with the cable joint 2, and the measurement surface is an arc surface adapted to the outer surface of the insulating layer of the cable joint 2. Thus, the temperature sensor 1 can be closely fitted with the outer surface of the insulating layer of the cable joint 2, facilitating temperature measurement. For example, the multiple temperature sensors 1 can be closely fitted with the cable joint 2 through fixing parts such as pipe clamps or adhesives.

[0033] The wireless remote transmission device is provided with a battery 8, and the battery 8 is used to supply power to at least one of the temperature sensor 1, the conversion circuit board, and the antenna 10. Specifically, the battery provides power for the entire buried cable joint temperature measurement device. The battery 8 supplies the required voltage to the temperature sensor 1 and the wireless remote transmission device through a power supply conversion unit, that is, the battery 8 is used to supply power to the temperature sensor 1, the conversion circuit board, and the antenna 10, so that no external power supply is required, facilitating power supply for the buried cable joint temperature measurement device in the wild. For example, the battery 8 is located in the housing 9.

[0034] In some embodiments, an external power supply can be connected where power access conditions are available, which can improve the reliability and stability of the power supply of this device and reduce the operation and maintenance workload brought by battery replacement.

[0035] In some embodiments, a display meter 11 is provided on the wireless remote transmission device. The display meter 11 is connected to the conversion circuit board, and the display meter 11 is used to display the temperature measured by the temperature sensor 1.

[0036] In some embodiments, the display meter 11 is used to display the highest temperature data measured by multiple temperature sensors 1. The antenna 10 cooperates with the conversion circuit board to send the highest temperature data measured by the multiple temperature sensors 1 to the control center, so as to facilitate preventing failures of the monitoring cable joint 2 caused by high temperature.

[0037] The present invention also proposes a measurement method using the buried cable joint temperature measurement device according to the embodiments of the present invention. The buried cable joint temperature measurement method according to the embodiments of the present invention includes the following steps: Dig out the soil, attach at least one temperature sensor 1 to the outer surface of the insulating layer of the cable joint 2, cover the cable joint 2 and the temperature sensor 1 with soil, install the wireless remote transmission device on the ground 4, and use the wireless remote transmission device to send the temperature data measured by the temperature sensor 1 to the control center.

[0038] The buried cable joint temperature measurement device according to the embodiments of the present invention can monitor the temperature and give an alarm for the buried cable joints during construction and after construction. And it has the advantages of convenient installation, wide application range, accurate temperature measurement, etc.

[0039] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0040] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0041] In the present invention, unless otherwise clearly specified or limited, the terms "mounted", "connected", "coupled", "fixed", etc. shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral body; it may be a mechanical connection, an electrical connection, or communicable with each other; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the internal communication between two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] In the present invention, unless otherwise clearly specified or limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0043] In the present invention, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0044] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. An underground cable joint temperature measurement device, characterized in that Comprising: At least one temperature sensor, which is buried underground and is attached to the outer surface of the insulating layer of a cable joint buried underground, so that the temperature sensor collects the temperature data of the insulating layer of the cable joint; A wireless remote transmission device, which is located on the ground. The wireless remote transmission device includes a conversion circuit board and an antenna. The temperature sensor is connected to the conversion circuit board through a first cable. The conversion circuit board is connected to the antenna, and the antenna cooperates with the conversion circuit board to send the temperature data measured by the temperature sensor to a control center.

2. The buried cable joint temperature measurement device according to claim 1, characterized in that, The buried cable joint temperature measurement device includes a fixing device, which is located directly above the cable joint, and the wireless remote transmission device is arranged on the fixing device.

3. The buried cable joint temperature measurement device according to claim 2, characterized in that, The fixing device includes a fixing pipe, which extends in the up and down direction. The fixing pipe is fixed on the ground. Flanges are provided at the top of the fixing pipe and the bottom of the wireless remote transmission device. The fixing pipe and the wireless remote transmission device are connected by bolts passing through the flanges on the fixing pipe and the flanges on the wireless remote transmission device.

4. The buried cable joint temperature measurement device according to claim 1, characterized in that, There are multiple temperature sensors, and the multiple temperature sensors are arranged at intervals in the circumferential direction on the outer surface of the insulating layer of the cable joint, and / or the multiple temperature sensors are arranged at intervals in the length direction of the cable joint on the outer surface of the insulating layer of the cable joint.

5. The buried cable joint temperature measurement device according to claim 4, characterized in that, The multiple temperature sensors are arranged at intervals in the circumferential direction on the outer surface of the insulating layer of the cable joint, and the multiple temperature sensors are symmetrically arranged on the outer surface of the insulating layer of the cable joint.

6. The temperature measurement device for the buried cable joint according to claim 1, wherein, The temperature sensor has a measurement surface for attaching to the cable joint, and the measurement surface is an arc surface adapted to the outer surface of the insulating layer of the cable joint.

7. The buried cable joint temperature measurement device according to claim 1, wherein The first cable is an armored cable; The temperature sensor is a chip resistance temperature sensor; A battery is provided in the wireless remote transmission device, and the battery is used to supply power to at least one of the temperature sensor, the conversion circuit board and the antenna.

8. The temperature measuring device for the buried cable joint according to claim 4, wherein, A display meter is provided on the wireless remote transmission device. The display meter is connected to the conversion circuit board, and the display meter is used to display the temperature measured by the temperature sensor.

9. The temperature measurement device for the buried cable joint according to claim 8, wherein, The display meter is used to display the highest temperature data measured by the multiple temperature sensors.

10. A measurement method using the buried cable joint temperature measurement device according to any one of claims 1-9, characterized in that, Including the following steps: Dig out the soil, attach at least one temperature sensor to the outer surface of the insulating layer of the cable joint, cover the cable joint and the temperature sensor with soil, install the wireless remote transmission device on the ground, and use the wireless remote transmission device to send the temperature data measured by the temperature sensor to the control center.

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