Power cable joint on-line monitoring system and method based on multi-dimensional sensing technology

Abstract

The invention relates to a power cable joint on-line monitoring system and method based on a multi-dimensional sensing technology, and relates to the technical field of power cable intermediate joint comprehensive on-line monitoring. The system comprises a master station monitoring system, a power cable comprehensive online monitoring device and a power cable. The master station monitoring system is in communication connection with the power cable comprehensive online monitoring device; the power cable on-line comprehensive detection device is located at the position of a middle connector of a power cable. The number of the power cable comprehensive online monitoring devices corresponds to the number of power cables; the power cable comprehensive online monitoring device comprises a ground electric wave sensing unit, an ultrasonic wave sensing unit, a temperature sensing unit, a water immersion sensing unit, a communication unit and a main control unit. According to the technical means of carrying out real-time monitoring and intelligent diagnosis analysis on the operation state, environmental parameters, fault hidden dangers and the like of the power cable, the middle joint of the power cable is monitored in real time through a multi-dimensional sensing technology, and the real-time operation state of the power cable can be accurately known.

Description

Technical Field

[0001] The present invention relates to the technical field of comprehensive on-line monitoring of intermediate joints of power cables, and particularly relates to an on-line monitoring system and method for power cable joints based on multi-dimensional sensing technology. Background Art

[0002] As an important carrier for transmitting and distributing electric energy in the power system, the safety and stability of power cables play a crucial role in the normal operation of the power system.

[0003] At present, most power companies across the country are still in the stage of planned maintenance for the main cables in power tunnels and ducts, and generally use regular inspections to check the operating conditions of the cables.

[0004] However, from both economic and technical perspectives, planned maintenance has great limitations. For example, regular tests and maintenance cause a large amount of direct and indirect economic waste, many insulation defects and potential faults cannot be detected in time, and distribution cable lines are in harsh environments such as high humidity and mildew for a long time, and are relatively concealed. It is difficult to provide a reliable power supply for monitoring equipment for a large number of directly buried cables, making it difficult to carry out the daily operation and maintenance work of distribution cables. Summary of the Invention

[0005] The present invention relates to an on-line monitoring system and method for power cable joints based on multi-dimensional sensing technology, which can timely detect and respond to abnormal situations of power cables. The technical solution is as follows: On the one hand, an on-line monitoring system for power cable joints based on multi-dimensional sensing technology is provided. The system includes a master station monitoring system, a comprehensive on-line monitoring device for power cables, and power cables; The master station monitoring system is communicatively connected to the comprehensive on-line monitoring device for power cables; The on-line comprehensive detection device for power cables is located at the intermediate joint position of the power cables; The number of comprehensive on-line monitoring devices for power cables corresponds to the number of power cables; The comprehensive on-line monitoring device for power cables includes a ground wave sensing unit, an ultrasonic sensing unit, a temperature sensing unit, a water immersion sensing unit, a communication unit, and a main control unit; The ground wave sensing unit, the ultrasonic sensing unit, the temperature unit, and the communication unit are respectively connected to the main control unit; The ground wave sensing unit is used to collect the first high-frequency signal generated at the power cable based on the ground wave partial discharge detection principle; The ultrasonic sensing unit is used to collect the second high-frequency signal generated at the power cable based on the ultrasonic detection principle; The temperature sensing unit is used to collect the temperature data of the power cable at the joint position; The water immersion sensing unit is used to collect water immersion data of the power cable at the joint position; The main control unit is used to receive and process the first high-frequency signal, the second high-frequency signal, the temperature data and the water immersion data to generate power cable status data; The communication unit is used to report the power cable status data to the master station monitoring system.

[0006] In an optional embodiment, the power cable comprehensive online monitoring device further includes a power supply module; The power supply module is connected to the main control unit; The power supply module is used to supply power to the power cable comprehensive online monitoring device.

[0007] On the other hand, a power cable joint online monitoring method based on multi-dimensional sensing technology is provided. This method is applied to the power cable comprehensive online monitoring system within any of the above-mentioned power cable joint online monitoring systems based on multi-dimensional sensing technology. The method includes: Collecting the first high-frequency signal generated at the power cable through the ground wave sensing unit based on the ground wave partial discharge detection principle; Collecting the second high-frequency signal generated at the power cable through the ultrasonic sensing unit based on the ultrasonic detection principle; Collecting the temperature data of the power cable at the joint position through the temperature sensing unit; Collecting the water immersion data of the power cable at the joint position through the water immersion sensing unit; Receiving and processing the first high-frequency signal, the second high-frequency signal, the temperature data and the water immersion data through the main control unit to obtain power cable status data; Reporting the power cable status data to the master station monitoring system through the communication unit.

[0008] In an optional embodiment, the power cable operation status data includes at least one of discharge parameter data, cable temperature data, water level status data and alarm information data.

[0009] In an optional embodiment, receiving and processing the first high-frequency signal, the second high-frequency signal, the temperature data and the water immersion data through the main control unit to obtain power cable status data includes: Based on the first high-frequency signal and the second high-frequency signal through the main control unit, performing discharge parameter data through combined pattern analysis. The discharge parameter data includes discharge frequency data, discharge amplitude data and discharge average data; Obtaining the power cable status data based on the discharge parameter data.

[0010] In an optional embodiment, the method further includes: The main control unit generates a partial discharge warning signal in response to the discharge parameter data indicating that the power cable is in a partial discharge state; Generate power cable status data in combination with the partial discharge warning signal.

[0011] In an optional embodiment, receive and process the first high-frequency signal, the second high-frequency signal, the temperature data, and the water immersion data to obtain power cable status data, including: Determine the temperature data by the main control unit; In response to the temperature data indicating that the temperature at the joint position of the power cable is within an abnormal temperature range and the time within the abnormal temperature range reaches the abnormal temperature time threshold, generate a temperature warning signal; Generate power cable status data in combination with the temperature warning signal.

[0012] In an optional embodiment, receive and process the first high-frequency signal, the second high-frequency signal, the temperature data, and the water immersion data to obtain power cable status data, including: Determine the water immersion data by the main control unit; In response to the crystal data indicating that the duration of the power cable in a water immersion state reaches the water immersion duration threshold, generate a water immersion warning signal; Generate power cable status data in combination with the water immersion warning signal.

[0013] In an optional embodiment, the power cable integrated on-line detection device further includes a power supply module; The power supply module is connected to the main control module; The power cable status data further includes power consumption data, and the power consumption data is used to display the remaining power of the power supply module.

[0014] The beneficial effects brought by the technical solution provided by the present invention at least include: Technical means for real-time monitoring and intelligent diagnosis and analysis of the operating status, environmental parameters, and potential faults of power cables. Through multi-dimensional perception technology, real-time monitoring of the middle joints of power cables can accurately understand the real-time operating status of power cables. Mainly by collecting and analyzing key parameters such as the temperature, current-carrying capacity, partial discharge, and environmental parameters of power cables and their changes, to reflect problems such as cable aging, damage, and overload, and can timely discover and handle abnormal situations to avoid the occurrence of cable faults. Brief Description of the Drawings

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0016] Figure 1 Shows a schematic structural diagram of an on-line monitoring system for power cable joints based on multi-dimensional sensing technology provided by an exemplary embodiment of the present invention.

[0017] Figure 2 Shows a schematic structural diagram of another on-line monitoring system for power cable joints based on multi-dimensional sensing technology provided by an exemplary embodiment of the present invention.

[0018] Figure 3 Shows a schematic flow diagram of an on-line monitoring method for power cable joints based on multi-dimensional sensing technology provided by an exemplary embodiment of the present invention. Detailed implementation manners

[0019] To make the objectives, technical solutions and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0020] Figure 1 Shows a schematic structural diagram of an on-line monitoring system for power cable joints based on multi-dimensional sensing technology provided by an exemplary embodiment of the present invention. Please refer to Figure 1 , the system includes a master station monitoring system 110, a power cable comprehensive on-line monitoring device 120, and a power cable 130. The master station monitoring system 110 is communicatively connected to the power cable comprehensive on-line monitoring device 120; the power cable on-line comprehensive detection device 120 is located at the intermediate joint position of the power cable 130; the number of power cable comprehensive on-line monitoring devices 120 corresponds to the number of power cables 130; the power cable comprehensive on-line monitoring device 120 includes a ground wave sensing unit 121, an ultrasonic sensing unit 122, a temperature sensing unit 123, a water immersion sensing unit 124, a communication unit 125, and a main control unit 126; the ground wave sensing unit 121, the ultrasonic sensing unit 122, the temperature unit 123, and the communication unit 124 are respectively connected to the main control unit 126; the ground wave sensing unit 121 is used to collect a first high-frequency signal generated at the power cable based on the ground wave partial discharge detection principle; the ultrasonic sensing unit 122 is used to collect a second high-frequency signal generated at the power cable based on the ultrasonic detection principle; the temperature sensing unit 123 is used to collect the temperature data of the power cable at the joint position; the water immersion sensing unit 124 is used to collect the water immersion data of the power cable at the joint position; the main control unit 126 is used to receive and process the first high-frequency signal, the second high-frequency signal, the temperature data, and the water immersion data to generate power cable status data; the communication unit 125 is used to report the power cable status data to the master station monitoring system.

[0021] In some alternative embodiments, please refer to Figure 2, the system further includes a power supply module 127, and the power supply module 127 is connected to the main control unit 126; the power supply module 127 is used to supply power to the integrated on-line monitoring device for power cables.

[0022] Combined with the above system structure, in various embodiments of the present invention, an on-line monitoring method for power cable joints based on multi-dimensional sensing technology is further included. Figure 3 The flowchart of an on-line monitoring method for power cable joints based on multi-dimensional sensing technology provided by an exemplary embodiment of the present invention is shown. Taking this method as an example applied to the integrated on-line monitoring device for power cables in the on-line monitoring system for power cable joints based on multi-dimensional sensing technology as shown in Figure 1 or Figure 2 is described. This method includes: Step 301, through the ground wave sensing unit, collect the first high-frequency signal generated at the power cable based on the ground wave partial discharge detection principle.

[0023] Step 302, through the ultrasonic sensing unit, collect the second high-frequency signal generated at the power cable based on the ultrasonic detection principle.

[0024] Step 303, through the temperature sensing unit, collect the temperature data of the power cable at the joint position.

[0025] Step 304, through the water immersion sensing unit, collect the water immersion data of the power cable at the joint position.

[0026] Step 305, through the main control unit, receive and process the first high-frequency signal, the second high-frequency signal, the temperature data, and the water immersion data to obtain the power cable status data.

[0027] Step 306, report the power cable status data to the master station monitoring system through the communication unit.

[0028] This process is the process of reporting the power cable status data. Optionally, the communication unit is configured to report data when an abnormal situation occurs, or the communication unit is configured to report data regularly. The present invention does not limit the specific manner of data reporting.

[0029] Next, the specific data processing method of the integrated on-line monitoring device for power cables is described.

[0030] In an optional embodiment, the power cable operation status data includes at least one of discharge parameter data, cable temperature data, water level status data, and alarm information data. Among them, the mortgage parameter data specifically includes discharge times data, discharge amplitude data, and discharge mean data.

[0031] In this case, the process of the master control unit receiving and processing the first high-frequency signal, the second high-frequency signal, the temperature data, and the water immersion data to obtain the power cable status data further includes: based on the first high-frequency signal and the second high-frequency signal by the master control unit, combining spectrum analysis to perform discharge parameter data, and the discharge parameter data includes discharge times data, discharge amplitude data, and discharge mean data; obtaining the power cable status data based on the discharge parameter data.

[0032] That is, when a partial discharge phenomenon is detected, the master control unit will add corresponding warning data to the power cable status data and send it through the communication module.

[0033] It should be noted that in some embodiments of the present invention, after the detection of ground wave partial discharge and ultrasonic detection, the corresponding data is obtained and diagnostic analysis is performed. When it is preliminarily determined that the data is abnormal during the diagnostic analysis, the system can continue to perform spectrum analysis using the Phase Resolved Partial Discharge (PRPD) spectrum and the Phase Resolved Pulse Sequence (PRPS) spectrum. In one example, the periodic change of the partial discharge signal and the correlation analysis of the 50Hz and 100Hz partial discharge information are analyzed through two-dimensional and three-dimensional spectrum analysis. Optionally, for the non-periodic signal spectrum, if the amplitude is large but the correlation with 50Hz and 100Hz is not strong, it is determined that no partial discharge occurs; for the periodic signal spectrum, if the amplitude is large and the correlation with 50Hz and 100Hz is strong, it is determined that partial discharge occurs.

[0034] It should be noted that the ground wave partial discharge detection process involved in the embodiments of the present invention includes a filtering method, feature extraction, and a positioning process. The ultrasonic partial discharge detection principle involved in the embodiments of the present invention can be a filtering, feature extraction, and positioning process based on sound waves. The specific implementation forms of each detection principle of the present invention are not limited.

[0035] In an alternative embodiment, the master control unit determines the temperature data; in response to the temperature data indicating that the temperature of the power cable at the joint position is within an abnormal temperature range and the time within the abnormal temperature range reaches the abnormal temperature time threshold, a temperature warning signal is generated; the power cable status data is generated in combination with the temperature warning signal.

[0036] In an alternative embodiment, the master control unit determines the water immersion data; in response to the water crystal data indicating that the duration of the power cable in the water immersion state reaches the water immersion duration threshold, a water immersion warning signal is generated; the power cable status data is generated in combination with the water immersion warning signal.

[0037] That is, the system involved in the present invention can also detect whether there are temperature anomalies and long-term immersion phenomena at the positions of power cable joints, and when anomalies occur, an alarm is sent through the communication module.

[0038] In some embodiments of the present invention, corresponding to the case where the power cable comprehensive online detection device further includes a power supply module, the power cable data may further include power consumption data, and the power consumption data is used to display the remaining power of the power supply module to inform the master station monitoring system of the power of the power cable comprehensive online monitoring device.

[0039] In summary, the system and method provided by the embodiments of the present invention are technical means for real-time monitoring and intelligent diagnostic analysis of the operating status, environmental parameters, fault hazards, etc. of power cables. Through multi-dimensional sensing technology, the intermediate joints of power cables are monitored in real time, and the real-time operating status of power cables can be accurately understood. Mainly by collecting and analyzing key parameters such as the temperature, current-carrying capacity, partial discharge, and environmental parameters of power cables and their changes, problems such as cable aging, damage, and overload can be reflected, and abnormal situations can be discovered and processed in a timely manner to avoid the occurrence of cable faults.

[0040] The above are only optional embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An online monitoring system for power cable joints based on multi-dimensional sensing technology, characterized in that: The system includes a master station monitoring system, a comprehensive online monitoring device for power cables and power cables; The master station monitoring system is communicatively connected with the power cable comprehensive online monitoring device; The power cable online comprehensive detection device is located at the middle joint of the power cable; The number of the power cable comprehensive online monitoring devices corresponds to the number of the power cables; The power cable comprehensive online monitoring device comprises a geomagnetic wave sensing unit, an ultrasonic sensing unit, a temperature sensing unit, a water immersion sensing unit, a communication unit and a main control unit; The ground wave sensing unit, the ultrasonic sensing unit, the temperature unit and the communication unit are respectively connected to the main control unit; The ground wave sensing unit is used to collect the first high frequency signal generated at the power cable based on the ground wave partial discharge detection principle; The ultrasonic sensor unit is used to collect the second high-frequency signal generated at the power cable based on the ultrasonic detection principle; The temperature sensing unit is used to collect temperature data of the power cable at the joint position; The water immersion sensing unit is used to collect water immersion data of the power cable at the joint position; The main control unit is used to receive and process the first high-frequency signal, the second high-frequency signal, the temperature data and the water immersion data to generate power cable status data; The communication unit is used to report the power cable status data to the master station monitoring system.

2. The online monitoring system for power cable joints based on multi-dimensional sensing technology according to claim 1 is characterized in that: The power cable comprehensive online monitoring device also includes a power module; The power module is connected to the main control unit; The power supply module is used to supply power to the power cable comprehensive online monitoring device.

3. A method for online monitoring of power cable joints based on multi-dimensional sensing technology, characterized in that: The method is applied to a comprehensive online monitoring system for power cables in an online monitoring system for power cable joints based on multi-dimensional sensing technology as claimed in claim 1 or 2, and the method comprises: The first high-frequency signal generated at the power cable is collected by a ground wave sensing unit based on the ground wave partial discharge detection principle; The second high-frequency signal generated at the power cable is collected by an ultrasonic sensor unit based on the ultrasonic detection principle; Collecting temperature data of the power cable at the joint position through a temperature sensing unit; Collecting water immersion data of the power cable at the joint position through a water immersion sensing unit; Receiving and processing the first high-frequency signal, the second high-frequency signal, the temperature data and the water immersion data through a main control unit to obtain power cable status data; The power cable status data is reported to the main station monitoring system through the communication unit.

4. The method for online monitoring of power cable joints based on multi-dimensional sensing technology according to claim 1 is characterized in that: The power cable operation status data includes at least one of discharge parameter data, cable temperature data, water level status data and alarm information data.

5. The method for online monitoring of power cable joints based on multi-dimensional sensing technology according to claim 4 is characterized in that: The receiving and processing of the first high-frequency signal, the second high-frequency signal, the temperature data and the water immersion data by the main control unit to obtain the power cable status data includes: The main control unit generates discharge parameter data based on the first high-frequency signal and the second high-frequency signal in combination with spectrum analysis, wherein the discharge parameter data includes discharge frequency data, discharge amplitude data, and discharge mean data; The power cable status data is obtained based on the discharge parameter data.

6. The method for online monitoring of power cable joints based on multi-dimensional sensing technology according to claim 5 is characterized in that: The method further comprises: The main control unit generates a partial discharge alarm signal in response to the discharge parameter data indicating that the power cable is in a partial discharge state; The power cable status data is generated in combination with the partial discharge alarm signal.

7. The method for online monitoring of power cable joints based on multi-dimensional sensing technology according to claim 5 is characterized in that: The receiving and processing the first high-frequency signal, the second high-frequency signal, the temperature data, and the water immersion data to obtain power cable status data includes: Determining temperature data based on the main control unit; In response to the temperature data indicating that the temperature of the power cable at the joint position is in an abnormal temperature range, and the time in the abnormal temperature range reaches an abnormal temperature time threshold, generating a temperature alarm signal; The power cable status data is generated in combination with the temperature alarm signal.

8. The method for online monitoring of power cable joints based on multi-dimensional sensing technology according to claim 5 is characterized in that: The receiving and processing the first high-frequency signal, the second high-frequency signal, the temperature data, and the water immersion data to obtain power cable status data includes: Determining water immersion data by the main control unit; In response to the crystal data indicating that the duration of the power cable being in a water-immersed state reaches a water-immersed duration threshold, generating a water-immersed alarm signal; The power cable status data is generated in combination with the water immersion alarm signal.

9. The method for online monitoring of power cable joints based on multi-dimensional sensing technology according to claim 3 is characterized in that: The power cable comprehensive online detection device also includes a power supply module; The power module is connected to the main control module; The power cable status data also includes power data, and the power data is used to display the remaining power of the power module.

Images