CN111276927A - Monitoring and protection device, system and application method of cable intermediate joint based on CT power taking - Google Patents

Abstract

The invention discloses a monitoring and protecting device, a system and an application method of a cable intermediate joint based on CT electricity taking. The system comprises a communication relay device and the detection protection device; the application method is to push alarm messages according to the temperature and the pressure. The invention can realize passive and wireless real-time monitoring of the cable intermediate connector, does not need to replace batteries during monitoring, and effectively solves the problems of monitoring and controlling the state of the 10KV cable intermediate connector.

Description

Monitoring and protection device, system and application method of cable intermediate joint based on CT power taking

technical field

The invention relates to the security technology of the cable intermediate joint, in particular to a cable intermediate joint monitoring and protection device, system and application method based on CT (current transformer) power taking.

Background technique

As an important part of urban transmission lines, power cables are becoming more and more popular today. The intermediate joint of the cable is the weak link of the cable, and it is also the most prone to failure. Especially for 10kV cables, once a fire accident occurs at the intermediate joint, it will often run with load. The operation and maintenance personnel have a certain period of time to determine the fault point, which makes the repair time long and the repair is not timely, resulting in further expansion of the disaster. Therefore, how to avoid fire accidents in the intermediate joints of 10KV cables has become a key technical problem to be solved urgently.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention: in view of the above-mentioned problems in the prior art, a monitoring and protection device, system and application method of a cable intermediate joint based on CT power taking are provided. Real-time monitoring, monitoring does not require battery replacement, effectively solving the problem of state monitoring and control of 10KV cable intermediate joints.

In order to solve the above-mentioned technical problems, the technical scheme adopted in the present invention is:

A monitoring and protection device for intermediate cable joints based on CT power taking includes an explosion-proof box with a accommodating cavity for intermediate cable joints, wherein a temperature sensor, a pressure sensor, a signal transmitter and at least a A first CT, the output ends of the temperature sensor and the pressure sensor are connected to the signal transmitter, the first CT is sleeved on the cable in the accommodating cavity of the cable intermediate joint, and the output end of the first CT is connected to the temperature The power terminals of the sensor, the pressure sensor and the signal transmitter are connected.

Optionally, the signal transmitter includes a single-chip microcomputer and a wireless communication module that are connected to each other, and the output ends of the temperature sensor and the pressure sensor are connected to the single-chip computer.

Optionally, the wireless communication module is a mobile network communication module.

Optionally, the explosion-proof box is in a spindle state, two ends of the explosion-proof box are respectively provided with cable installation holes for passing cables, and the cables on both sides of the cable intermediate joint are inserted in the cable installation holes and are connected with the cable installation holes. The interference fit of the inner wall keeps the inside of the accommodating cavity of the cable intermediate joint sealed.

Optionally, the accommodating cavity of the cable intermediate joint is filled with fireproof and heat-insulating cotton.

Optionally, the explosion-proof box is made of epoxy resin, and the outer wall of the explosion-proof box is further provided with an energy leakage hole.

In addition, the present invention also provides a monitoring and protection system for intermediate cable joints based on CT power taking, including a communication relay device and the monitoring and protection device for intermediate cable joints based on CT power taking, and the monitoring and protection device for intermediate cable joints communicates with The relay device is connected to the network to transmit monitoring data.

Optionally, the communication relay device includes a battery power supply module and a communication relay module that are connected to each other, and an output end of the battery power supply module is connected to a power supply end of the communication relay module.

Optionally, the communication relay device further includes a second CT, the second CT is sleeved on the cable and the output end of the second CT is connected to the power end of the communication relay module.

In addition, the present invention also provides an application method of the aforementioned monitoring and protection device for a cable intermediate joint based on CT power taking. The implementation step includes: collecting the temperature and pressure of the cable intermediate joint through the CT-based cable intermediate joint monitoring and protection device. , if the temperature or pressure exceeds the preset threshold, the alarm message will be pushed to the information terminal of the designated in-station operation and maintenance personnel to remind the in-station operation and maintenance personnel to inquire or solve the hidden trouble.

Compared with the prior art, the present invention has the following advantages:

1. The present invention includes an explosion-proof box with an accommodating cavity for a cable intermediate joint. The explosion-proof box can effectively protect the cable intermediate joint, and can improve the service life of the cable intermediate joint.

2. A temperature sensor, a pressure sensor and a signal transmitter are respectively arranged in the accommodating cavity of the cable intermediate joint of the present invention, and the output ends of the temperature sensor and the pressure sensor are connected with the signal transmitter, and the temperature and The pressure is monitored in real time, so that the hidden faults of the cable intermediate joints can be effectively discovered, and the data basis can be provided for the big data analysis of the cable intermediate joints.

3. At least one first CT is also arranged in the accommodating cavity of the cable intermediate joint of the present invention, the first CT is sleeved on the cable in the accommodating cavity of the cable intermediate joint, and the output end of the first CT is connected with the temperature sensor, pressure sensor, The power supply end of the signal transmitter is connected, and local energy can be obtained through the first CT, so as to realize passive real-time monitoring of the intermediate joint of the cable. Monitoring does not require battery replacement, which effectively solves the state monitoring and control of the intermediate joint of the 10KV cable. question.

Description of drawings

FIG. 1 is a schematic structural diagram of an explosion-proof box in an embodiment of the present invention.

FIG. 2 is a schematic diagram of a frame structure of an electrical part in an embodiment of the present invention.

Legend description: 1. Explosion-proof box; 10. Reservoir cavity for cable intermediate joints; 11. Energy drain hole; 2. Temperature sensor; 3. Pressure sensor; 4. Signal transmitter; 41. Single chip computer; 42. Wireless communication module; 5 , the first CT; 6, the battery power supply module; 7, the communication relay module; 8, the second CT.

Detailed ways

As shown in FIG. 1 and FIG. 2 , the monitoring and protection device for the intermediate cable joint based on CT power taking in this embodiment includes an explosion-proof box 1 with a accommodating cavity 10 for the intermediate cable joint, and the intermediate cable joint accommodating cavity 10 is provided with There are a temperature sensor 2, a pressure sensor 3, a signal transmitter 4 and at least one first CT5, the output ends of the temperature sensor 2 and the pressure sensor 3 are connected with the signal transmitter 4, and the first CT5 is sleeved in the cable intermediate joint accommodating cavity 10 On the inner cable, the output end of the first CT5 is connected with the power end of the temperature sensor 2 , the pressure sensor 3 and the signal transmitter 4 .

As shown in FIG. 1 , in this embodiment, the explosion-proof box 1 is in a spindle state, and the two ends of the explosion-proof box 1 are respectively provided with cable installation holes for passing cables, and the cables on both sides of the intermediate joint of the cable are inserted in the cable installation holes and The interference fit with the inner wall of the cable installation hole keeps the interior of the cable intermediate joint accommodating cavity 10 sealed.

In this embodiment, the accommodating cavity 10 of the cable intermediate joint is filled with fireproof and heat-insulating cotton, so that the heat and pressure inside the explosion-proof box are not leaked, and the temperature and pressure monitoring accuracy can be improved.

In the present embodiment, the explosion-proof box 1 is made of epoxy resin with good water resistance and fire resistance, and the outer wall of the explosion-proof box 1 is further provided with an energy leakage hole 11 .

The diameter of temperature sensor 2 is not more than 1cm, the measurement range is within 20℃~1000℃, and the accuracy is ≥1%. The small volume of the temperature sensor 2 can be conveniently placed inside the explosion-proof box 1 , and the high precision and large measurement range can meet the temperature measurement requirements of the explosion-proof box 1 .

The diameter of the pressure sensor 3 does not exceed 2cm, the measurement range is within 0.05Mpa~100Mpa, and the accuracy is ≥0.05% FS. The small volume of the pressure sensor 3 can be easily placed inside the explosion-proof box 1. Pressure measurement of explosion-proof box 1 is required.

As shown in FIG. 2 , in this embodiment, the signal transmitter 4 includes a single-chip microcomputer 41 and a wireless communication module 42 connected to each other. The output ends of the temperature sensor 2 and the pressure sensor 3 are connected to the single-chip computer 41 to realize wireless monitoring of temperature and pressure. In this embodiment, the wireless communication module 42 is a mobile network communication module. As an optional implementation manner, the mobile network communication module in this embodiment adopts 4G/5G wireless communication technology. Undoubtedly, GPRS, 3G wireless communication technology can also be adopted as required, and other wireless communication technologies of the Internet of Things can also be adopted. There are many technologies, such as short-range communication technologies such as Zigbee, WiFi, Bluetooth, and Z-wave, or LPWAN communication technologies for low-power wide-area networks for wide-area networks.

The first CT5 takes power using the alternating electromagnetic field inside the 10kV single-phase cable, and directly obtains the energy consumption required for power supply from the cable according to the principle of electromagnetic induction, and provides it to the temperature sensor 2, pressure sensor 3, and signal transmitter 4 inside the explosion-proof box 1 for use .

As shown in FIG. 2 , the present embodiment also provides a monitoring and protection system for intermediate cable joints based on CT power taking, including a communication relay device and the aforementioned monitoring and protection device for intermediate cable joints based on CT power taking, and a monitoring and protection device for intermediate cable joints. The communication relay device is connected to the network to send monitoring data, and the communication range of the aforementioned CT-based cable intermediate joint monitoring and protection device can be greatly expanded through the communication relay device.

As shown in FIG. 2 , the communication relay device in this embodiment includes a battery power supply module 6 and a communication relay module 7 connected to each other. The output end of the battery power supply module 6 is connected to the power supply end of the communication relay module 7 . As an optional implementation manner, in this embodiment, the communication relay module 7 adopts 4G/5G wireless communication technology, relays and receives temperature and pressure data monitored by sensors, and sends signals to the monitoring platform. Undoubtedly, the communication relay module 7 can also adopt GPRS, 3G wireless communication technology as required, and can also adopt many other wireless communication technologies of the Internet of Things, such as Zigbee, WiFi, Bluetooth, Z-wave and other short-distance communication technologies, or Low power wide area network LPWAN communication technology for wide area network.

As shown in FIG. 2 , the communication relay device in this embodiment further includes a second CT8 , the second CT8 is sleeved on the cable and the output end of the second CT8 is connected to the power end of the communication relay module 7 . The communication relay device is installed in the cable tunnel (ditch). Since there are generally 110kV and 220kV cables in the cable tunnel (ditch), the second CT8 can be used to supply power for the communication relay. In order to ensure the communication relay Power supply reliability.

In addition, this embodiment also provides an application method of the aforementioned monitoring and protection device for the intermediate joint of the cable based on CT power taking, the implementation step includes: collecting the temperature and pressure of the intermediate joint of the cable through the monitoring and protection device for the intermediate joint of the cable based on the CT power taking, If the temperature or pressure exceeds the preset threshold, an alarm message will be pushed to the information terminal of the designated in-station operation and maintenance personnel to remind the in-station operation and maintenance personnel to inquire or solve the hidden trouble. The method in this embodiment uses the temperature and pressure inside the explosion-proof box 1 as monitoring quantities, and collects temperature and pressure measurement data in real time. The power consumption of the temperature sensor 2 and the pressure sensor 3 is provided by the first CT5 to obtain electricity, and 4G/5G wireless communication is used. The data is transmitted to the communication relay device and the monitoring platform (as shown in a in Figure 1) to realize passive and wireless real-time monitoring of the state of the intermediate joint of the 10kV cable. The monitoring platform sends the alarm information to the operation and maintenance personnel in the station. The terminal (mobile phone APP) reminds the inquiry, solves the hidden trouble, and improves the operation and maintenance level of the power cable. The monitoring platform receives the internal temperature and pressure data of the intermediate head protection box in real time, sets the alarm threshold, and immediately sends the alarm information to the information terminal when the threshold is exceeded, reminding the operation and maintenance personnel to check and eliminate hidden troubles. In this embodiment, 4G/5G wireless communication is used between the monitoring platform and the communication relay device.

The aforementioned method of judging the fault is that the temperature or pressure exceeds the preset threshold. In addition, as a further improvement method, it can also include a judgment method using a machine learning model, that is: inputting the temperature and pressure together into the pre-trained machine learning model, Thereby, the corresponding state of the intermediate joint of the cable is obtained, and if the state of the intermediate joint of the cable is a fault state or a hidden fault state, an alarm message is issued. As an optional implementation manner, the machine learning model may adopt a BP neural network model as required. When pre-training the BP neural network model, it is necessary to detect and generate a large number of sample data of cable intermediate joints, including the temperature, pressure and corresponding cable intermediate joint status of the cable intermediate joint. The BP neural network model is trained through the sample data, and when The training can be completed when the error is lower than the preset threshold or the number of training times exceeds the preset number of times.

The above are only the preferred embodiments of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions under the idea of the present invention belong to the protection scope of the present invention. It should be pointed out that for those skilled in the art, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims (10)

1. The utility model provides a cable intermediate head monitoring protection device based on CT gets electricity, its characterized in that, including explosion-proof box (1) that has cable intermediate head holding chamber (10), be equipped with temperature sensor (2), pressure sensor (3), signal transmitter (4) and at least one first CT (5) in cable intermediate head holding chamber (10) respectively, the output of temperature sensor (2), pressure sensor (3) links to each other with signal transmitter (4), first CT (5) cover is established on the cable in cable intermediate head holding chamber (10), the output of first CT (5) links to each other with the power end of temperature sensor (2), pressure sensor (3), signal transmitter (4).

2. The cable intermediate joint monitoring and protecting device based on CT power taking as recited in claim 1, wherein the signal transmitter (4) comprises a single chip microcomputer (41) and a wireless communication module (42) which are connected with each other, and the output ends of the temperature sensor (2) and the pressure sensor (3) are connected with the single chip microcomputer (41).

3. The cable intermediate joint monitoring and protecting device based on CT electricity taking as recited in claim 1, wherein the wireless communication module (42) is a mobile network communication module.

4. The cable intermediate joint monitoring and protecting device based on CT power taking as recited in claim 1, wherein the explosion-proof box (1) is in a spindle state, cable mounting holes for cables to penetrate through are respectively arranged at two ends of the explosion-proof box (1), and the cables at two sides of the cable intermediate joint are inserted into the cable mounting holes and are in interference fit with the inner wall of the cable mounting holes so that the inside of the cable intermediate joint accommodating cavity (10) is kept sealed.

5. The monitoring and protecting device for the cable intermediate joint based on CT electricity taking as recited in claim 4, wherein the accommodating cavity (10) for the cable intermediate joint is filled with fireproof heat insulation cotton.

6. The monitoring and protecting device for the intermediate joint of the cable based on CT power taking as claimed in claim 1, wherein the explosion-proof box (1) is made of epoxy resin, and the outer wall of the explosion-proof box (1) is further provided with an energy release hole (11).

7. A cable intermediate joint monitoring and protecting system based on CT electricity taking is characterized by comprising a communication relay device and the cable intermediate joint monitoring and protecting system based on CT electricity taking as claimed in any one of claims 1 to 6, wherein the cable intermediate joint monitoring and protecting system is connected to a network through the communication relay device to send monitoring data.

8. The monitoring and protecting system for the cable intermediate joint based on CT power taking as recited in claim 7, wherein the communication relay device comprises a battery power supply module (6) and a communication relay module (7) which are connected with each other, and an output end of the battery power supply module (6) is connected with a power supply end of the communication relay module (7).

9. The cable intermediate joint monitoring and protecting system based on CT power taking as recited in claim 8, wherein the communication relay device further comprises a second CT (8), the second CT (8) is sleeved on the cable, and the output end of the second CT is connected with the power supply end of the communication relay module (7).

10. An application method of the cable intermediate joint monitoring and protecting device based on CT electricity taking as claimed in any one of claims 1-6, characterized by comprising the following implementation steps: the monitoring and protecting device for the cable intermediate joint based on CT electricity taking collects the temperature and the pressure of the cable intermediate joint, and if the temperature or the pressure exceeds a preset threshold value, an alarm message is pushed to an information terminal of an appointed operation and maintenance person in the station so as to remind the operation and maintenance person in the station to inquire or solve the hidden trouble.

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