A cable partial discharge and carrier wave communication sensing integration system

Abstract

The application discloses a cable partial discharge and carrier communication sensing integrated system which is composed of a sensor and a radio frequency conditioning assembly. When working in different modes, the radio frequency conditioning assembly is switched to a corresponding radio frequency processing loop, and two functions are realized on the single sensor through time division multiplexing, namely, detecting a partial discharge signal on a cable grounding line and realizing quasi-high-speed carrier data communication by using a cable grounding loop. For occasions such as direct-buried cables, pipe cables, tunnels and compact cable pipe corridors which are not convenient for newly-built cable monitoring communication networks, the sensor can simplify the system structure, and can provide cable partial discharge monitoring functions and facilitate rapid deployment of newly-built communication networks and efficient networking communication.

Description

Technical Field

[0001] This invention relates to the field of online monitoring technology for electrical equipment, specifically to an integrated sensing system for cable partial discharge and carrier communication. Background Technology

[0002] With the improvement of urban construction standards, urban overhead power transmission lines have been gradually converted to underground power cable lines since the 1990s. Currently, these early-laid power cables are gradually entering the middle to late stages of their service life, exhibiting insulation aging and frequent faults, seriously endangering urban power supply safety. In recent years, to improve the operational safety of aging cables, operating units have generally begun to build dedicated condition monitoring systems for these cables, including systems for partial discharge monitoring at intermediate joints, grounding current monitoring, and monitoring of abnormal environmental conditions in the cable tunnel. The construction of cable condition monitoring systems usually requires the construction of dedicated communication systems. However, due to historical limitations, aging cables are typically laid using methods such as direct burial, duct laying, and tunneling, requiring secondary excavation to expand the communication system running through the cable tunnel, consuming a large amount of manpower and resulting in poor economic efficiency.

[0003] The high-frequency partial discharge detection method is applicable to the detection of partial discharge defects in most electrical equipment. This method utilizes the high-frequency magnetic core inside a high-frequency partial discharge sensor (HFCT) to actively couple the high-frequency current electromagnetic field generated by partial discharge. A high-frequency pulse voltage signal proportional to the partial discharge current is induced on a single-turn or multi-turn coil wound on the high-frequency magnetic core, thus detecting partial discharge in the electrical equipment. Because the partial discharge pulse current signal is characterized by small amplitude, extremely short rise time, and short pulse width, the magnetic core of the high-frequency partial discharge sensor has high permeability within the standard frequency range of 3–30 MHz.

[0004] Power line communication (PLC) is a communication technology that uses power transmission lines as the communication medium to transmit information via the power grid. Current broadband PLC technology typically employs electromagnetic wave signals in the 1–30 MHz frequency range, achieving near-high-speed communication speeds of 2 Mbps or higher. Depending on the characteristics of the transmission line at the access point, typical couplers used in PLC include inductive couplers and capacitive couplers.

[0005] Currently, the technical approaches of high-frequency current sensors and power line carrier communication couplers used for partial discharge monitoring in cables differ significantly, and there are no reports of using high-frequency current sensors to conduct research related to carrier communication. Summary of the Invention

[0006] Therefore, the technical problem to be solved by the present invention is to overcome the deficiency in the prior art that high-frequency current sensors are not used to carry out carrier communication related research, thereby providing an integrated sensing system for cable partial discharge and carrier communication.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] This invention provides an integrated sensing system for partial discharge and carrier communication in cables, comprising: a sensor and a radio frequency (RF) conditioning component. The first end of the sensor is connected to the grounding wire of the cable, and the second end of the sensor is connected to the first end of the RF conditioning component. The second end of the RF conditioning component is connected to an external controller. When the integrated system operates in partial discharge detection mode, the RF conditioning component switches to the corresponding RF processing circuit. When the cable discharges, the sensor senses and outputs a high-frequency pulse voltage signal. The RF processing circuit processes the high-frequency pulse voltage signal to obtain a partial discharge signal, and the external controller extracts the basic characteristics of the partial discharge signal. When the integrated system operates in carrier communication mode, the RF conditioning component switches to the corresponding RF processing circuit. The external controller sends a carrier digital signal to the RF processing circuit. The RF processing circuit processes the carrier digital signal to obtain a carrier analog signal. The sensor senses the carrier analog signal and generates a high-frequency electromagnetic field, which is coupled to the grounding wire circuit of the cable. Simultaneously, the sensor inside the integrated system operating in carrier communication mode senses the high-frequency electromagnetic field to obtain a carrier analog signal. Its internal RF processing circuit processes the carrier analog signal and transmits it to the connected external controller.

[0009] In one embodiment, the integrated sensing system for cable partial discharge and carrier communication further includes: a radio frequency (RF) connection component, a first end of which is connected to a second end of the sensor, and a second end of which is connected to a first end of the RF conditioning component.

[0010] In one embodiment, the sensor includes a high-frequency magnetic core and an induction coil, wherein the high-frequency magnetic core is sleeved on the grounding wire of the cable, the induction coil is wound around the high-frequency magnetic core, and the two ends of the induction coil are connected to the first end of the radio frequency connection assembly.

[0011] In one embodiment, the radio frequency (RF) conditioning component includes: an RF switch, a local analog signal conditioning module, a carrier analog signal bidirectional conditioning module, and an RF digital-to-analog / analog-to-digital converter module. A first terminal of the RF switch is connected to a second terminal of the RF connection component; a second terminal of the RF switch is connected to a first terminal of the local analog signal conditioning module; a third terminal of the RF switch is connected to a first terminal of the carrier analog signal bidirectional conditioning module; a second terminal of the local analog signal conditioning module is connected to a first terminal of the RF digital-to-analog / analog-to-digital converter module; a second terminal of the carrier analog signal bidirectional conditioning module is connected to a second terminal of the RF digital-to-analog / analog-to-digital converter module; and a third terminal of the RF digital-to-analog / analog-to-digital converter module is connected to a peripheral controller.

[0012] In one embodiment, when operating in partial discharge detection mode, the RF switch disconnects from the carrier analog signal bidirectional conditioning module and connects to the local analog signal conditioning module. When the cable discharges, the sensor senses and outputs a high-frequency pulse voltage signal. The local analog signal conditioning module filters, reduces noise, amplifies, and shapes the waveform of the high-frequency pulse voltage signal before sending it to the RF digital-to-analog / analog-to-digital converter module. The RF digital-to-analog / analog-to-digital converter module performs analog-to-digital conversion on the processed high-frequency pulse voltage signal to obtain the partial discharge signal and sends it to the peripheral controller.

[0013] In one embodiment, when operating in carrier communication mode, the RF switch disconnects from the local analog signal conditioning module and connects to the carrier analog signal bidirectional conditioning module. The peripheral controller sends a carrier digital signal to the RF digital-to-analog / analog-to-digital converter module. The RF digital-to-analog / analog-to-digital converter module performs digital-to-analog conversion on the carrier digital signal to obtain a small carrier analog signal, which is then sent to the carrier analog signal bidirectional conditioning module. The carrier analog signal bidirectional conditioning module amplifies the small carrier analog signal to obtain a carrier analog signal, which is then sent to the sensor. The sensor senses the carrier analog signal and generates a high-frequency electromagnetic field, which is coupled to the grounding loop of the cable. Simultaneously, the sensor inside the integrated system operating in carrier communication mode senses the high-frequency electromagnetic field to obtain a carrier analog signal. Its internal carrier analog signal bidirectional conditioning module and RF digital-to-analog / analog-to-digital converter module sequentially attenuate and convert the carrier analog signal to digital to obtain a carrier digital signal, which is then sent to the connected peripheral controller.

[0014] In one embodiment, the integrated sensing system for partial discharge and carrier communication further includes: a control and analysis host, which is connected to the third terminal of the radio frequency digital-to-analog / analog-to-digital converter module. The control and analysis host is used to extract basic characteristics of the partial discharge signal, send data to the radio frequency digital-to-analog / analog-to-digital converter module, and receive the processed carrier analog signal.

[0015] In one embodiment, the radio frequency conditioning component and the control analysis host are packaged as one unit.

[0016] In one embodiment, the high-frequency magnetic core and the induction coil are packaged as a single unit.

[0017] In one embodiment, a time-division multiplexing method is used to reuse the front-end sensor and the internal high-frequency magnetic core and induction coil to implement partial discharge detection and carrier communication on the same physical entity.

[0018] The technical solution of this invention has the following advantages:

[0019] The integrated sensing system for partial discharge and carrier communication in cables provided by this invention consists of a sensor and a radio frequency conditioning component. When operating in different modes, the radio frequency conditioning component switches to the corresponding radio frequency processing circuit and reuses the same sensor to realize partial discharge detection and carrier communication with other integrated systems. That is, it uses the same sensing system to realize the detection of high-frequency current signals of partial discharge on the cable grounding wire and quasi-high-speed carrier communication. Attached Figure Description

[0020] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0021] Figure 1 A composition diagram of a specific example of the integrated sensing system for partial discharge of cables and carrier communication provided in an embodiment of the present invention;

[0022] Figure 2 An installation diagram of the integrated sensing system for partial discharge of cables and carrier communication provided in an embodiment of the present invention;

[0023] Figure 3 A composition diagram of another specific example of the integrated sensing system for partial discharge of cables and carrier communication provided in the embodiments of the present invention;

[0024] Figure 4 A composition diagram of another specific example of the integrated sensing system for partial discharge of cables and carrier communication provided in the embodiments of the present invention;

[0025] Figure 5 A composition diagram of another specific example of the integrated sensing system for partial discharge of cables and carrier communication provided in the embodiments of the present invention;

[0026] Figure 6 This is a schematic diagram of the signal flow in the partial discharge detection mode provided in an embodiment of the present invention;

[0027] Figure 7 This is a schematic diagram of the signal flow direction of the carrier communication mode provided in an embodiment of the present invention;

[0028] Figure 8 A composition diagram of another specific example of the integrated sensing system for partial discharge of cables and carrier communication provided in the embodiments of the present invention;

[0029] Figure 9 The transmission loss test curve is provided for an embodiment of the present invention. Detailed Implementation

[0030] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can also refer to the internal connection of two components; and they can refer to a wireless connection or a wired connection. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0032] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0033] Example

[0034] This invention provides an integrated sensing system for cable partial discharge and carrier communication, such as... Figure 1 As shown, it includes: sensor 1 and radio frequency conditioning component 2.

[0035] Specifically, the first end of sensor 1 is connected to the grounding wire of the cable, the second end of sensor 1 is connected to the first end of RF conditioning component 2, and the second end of RF conditioning component 2 is connected to the peripheral controller; wherein, for example... Figure 2 As shown, the integrated sensing system for partial discharge and carrier communication of cables in this embodiment of the invention is connected to the grounding (wire) circuit of the monitored cable circuit.

[0036] Furthermore, the integrated sensing system for partial discharge and carrier communication of cables in this embodiment of the invention can realize the functions of partial discharge detection of cables and carrier communication with another integrated sensing system for partial discharge and carrier communication of cables. Therefore, two working modes are set: partial discharge detection mode and carrier communication mode. The partial discharge detection mode and carrier communication mode are implemented in a time-division multiplexing manner, that is, the same sensor 1 is used to realize two functions in different time periods.

[0037] Specifically, when the integrated sensing system for partial discharge and carrier communication of cables is operating in the partial discharge detection mode, the radio frequency conditioning component 2 switches to the corresponding radio frequency processing circuit. When the cable discharges, the sensor 1 senses and outputs a high-frequency pulse voltage signal. The radio frequency processing circuit processes the high-frequency pulse voltage signal to obtain the partial discharge signal, and the peripheral controller extracts the basic characteristics of the partial discharge signal.

[0038] Specifically, when a partial discharge occurs due to a local defect in the cable, a high-frequency pulse current signal of the partial discharge flows through the cable grounding line. Sensor 1 senses and outputs a high-frequency pulse voltage signal that is proportional to the signal, which is then processed by the radio frequency processing circuit and sent to the peripheral controller. The peripheral controller analyzes the partial discharge signal, such as pulse amplitude, pulse interval, and partial discharge statistical spectrum.

[0039] Specifically, when the integrated sensing system for partial discharge and carrier communication of cables operates in carrier communication mode, the radio frequency conditioning component 2 switches to the corresponding radio frequency processing circuit. The peripheral controller sends a digital carrier signal to the radio frequency processing circuit. The radio frequency processing circuit processes the digital carrier signal to obtain a carrier analog signal. The sensor 1 senses the carrier analog signal and generates a high-frequency electromagnetic field. The high-frequency electromagnetic field is coupled to the grounding circuit of the cable. At the same time, the sensor 1 inside the integrated sensing system for partial discharge and carrier communication of cables operating in carrier communication mode senses the high-frequency electromagnetic field to obtain a carrier analog signal. Its corresponding radio frequency processing circuit processes the carrier analog signal and transmits it to the peripheral controller it is connected to.

[0040] Specifically, such as Figure 2As shown, multiple integrated sensing systems for partial discharge and carrier communication are installed on the cable. Integrated systems #1 to #4 and #2 to #4 can transmit the detected data to integrated system #1 in the form of a carrier wave. For example, when integrated system #2 sends data to integrated system #1, the following process occurs in integrated system #2: the RF conditioning component 2 of integrated system #2 switches to the corresponding RF processing loop; the peripheral controller of integrated system #2 sends a carrier digital signal to the RF processing loop; the RF processing loop of integrated system #2 processes the carrier digital signal to obtain a carrier analog signal; the sensor 1 of integrated system #2 senses the carrier analog signal and generates a high-frequency electromagnetic field; the high-frequency electromagnetic field is coupled to the grounding loop of the cable. The following process occurs in integrated system #1: the sensor 1 of integrated system #1 senses the high-frequency electromagnetic field to obtain a carrier analog signal; the corresponding RF processing loop of integrated system #1 processes the carrier analog signal and transmits it to the peripheral controller it is connected to.

[0041] In summary, by using the above methods, maintenance personnel can physically access the peripheral controller of any node in the entire cable line under test during maintenance, and then view the monitoring results of all nodes and other relevant comprehensive information.

[0042] In one specific embodiment, such as Figure 3 As shown, the integrated sensing system for partial discharge of cables and carrier communication also includes: a radio frequency connection component 3, the first end of which is connected to the second end of the sensor 1, and the second end of which is connected to the first end of the radio frequency connection component 2.

[0043] In one specific embodiment, such as Figure 4 As shown, the sensor 1 includes a high-frequency magnetic core 11 and an induction coil 12. The high-frequency magnetic core 11 is sleeved on the grounding wire 4 of the cable, and the induction coil 12 is wound around the high-frequency magnetic core 11. The two ends of the induction coil 12 are connected to the first end of the radio frequency connection assembly 3.

[0044] Specifically, the high-frequency magnetic core 11 is a key component in the implementation of the sensor 1. The soft magnetic ferrite core, manufactured using a specific formula and sintering process, operates with a frequency bandwidth greater than 1–30 MHz, simultaneously meeting the requirements for high-sensitivity acquisition of partial discharge signals and efficient coupling and transmission of carrier communication signals. When a partial discharge occurs due to a local defect in the cable, a high-frequency pulse current signal flows through the cable grounding wire 4. The high-frequency magnetic core 11 can couple to this high-frequency electromagnetic field of the partial discharge current. According to the principle of electromagnetic induction, a high-frequency pulse voltage signal proportional to the amplitude of the high-frequency pulse current of the partial discharge is generated on the induction coil 12 for subsequent processing and analysis. Similarly, during carrier communication, according to the principle of electromagnetic induction, when a high-frequency pulse current passes through the induction coil 12, a corresponding high-frequency electromagnetic field is generated in the high-frequency magnetic core 11 and coupled to the cable grounding wire 4.

[0045] In one specific embodiment, such as Figure 5 As shown, the radio frequency conditioning component 2 includes: a radio frequency switch 21, a local analog signal conditioning module 22, a carrier analog signal bidirectional conditioning module 23, and a radio frequency digital-to-analog / analog-to-digital conversion module 24.

[0046] Specifically, such as Figure 5 As shown, the first end of the RF switch 21 is connected to the second end of the RF connection component 3, the second end of the RF switch 21 is connected to the first end of the local analog signal conditioning module 22, and the third end of the RF switch 21 is connected to the first end of the carrier analog signal bidirectional conditioning module 23; the second end of the local analog signal conditioning module 22 is connected to the first end of the RF digital-to-analog / analog-to-digital conversion module 24; the second end of the carrier analog signal bidirectional conditioning module 23 is connected to the second end of the RF digital-to-analog / analog-to-digital conversion module 24; and the third end of the RF digital-to-analog / analog-to-digital conversion module 24 is connected to the peripheral controller.

[0047] Furthermore, the integrated system of this embodiment can realize carrier communication and partial discharge detection. Therefore, two operating modes are set: partial discharge detection mode and carrier communication mode. When operating in different modes, the RF conditioning component 2 switches to different RF processing loops, specifically switched by the RF switch 21. Specifically, the RF switch 21 realizes time-division multiplexing of the high-frequency magnetic core 11 and the induction coil 12 by switching different RF processing loops. The RF digital-to-analog / analog-to-digital conversion module 24 is responsible for the digital-to-analog / analog-to-digital conversion of partial discharge signals and carrier communication signals. Due to the interactive characteristics of the transmit / receive data streams of carrier communication, the carrier analog signal bidirectional conditioning module 23 and the RF digital-to-analog / analog-to-digital conversion module 24 operate bidirectionally only when the sensing system is operating in carrier communication mode.

[0048] Specifically, such as Figure 6As shown, when operating in partial discharge detection mode, RF switch 21 disconnects from carrier analog signal bidirectional conditioning module 23 and connects to local analog signal conditioning module 22. When the cable discharges, sensor 1 senses and outputs a high-frequency pulse voltage signal. Local analog signal conditioning module 22 filters, reduces noise, amplifies, and shapes the high-frequency pulse voltage signal before sending it to RF digital-to-analog / analog-to-digital converter module 24. RF digital-to-analog / analog-to-digital converter module 24 performs analog-to-digital conversion on the processed high-frequency pulse voltage signal to obtain the partial discharge signal and sends it to peripheral controller. Peripheral controller extracts basic characteristics of the partial discharge signal, such as pulse amplitude, pulse interval, and partial discharge statistical spectrum.

[0049] Specifically, such as Figure 7 As shown, when operating in carrier communication mode, RF switch 21 disconnects from the local analog signal conditioning module 22 and connects to the carrier analog signal bidirectional conditioning module 23. The peripheral controller sends a carrier digital signal to the RF digital-to-analog / analog-to-digital converter module 24. The RF digital-to-analog / analog-to-digital converter module 24 performs digital-to-analog conversion on the carrier digital signal to obtain a small carrier analog signal, which is then sent to the carrier analog signal bidirectional conditioning module 23. The carrier analog signal bidirectional conditioning module 23 amplifies the small carrier analog signal to obtain a carrier analog signal, which is then sent to sensor 1. Sensor 1 senses a carrier analog signal and generates a high-frequency electromagnetic field, which is coupled to the grounding wire 4 of the cable. At the same time, the sensor 1 inside the cable partial discharge and carrier communication sensing integrated system, which operates in carrier communication mode, senses the high-frequency electromagnetic field and obtains a carrier analog signal. Its internal carrier analog signal bidirectional conditioning module 23 and radio frequency digital-to-analog / analog-to-digital conversion module 24 attenuate and convert the carrier analog signal in sequence to obtain a carrier digital signal, which is then sent to the connected peripheral controller. The physical layer connection of carrier communication can be established between the two integrated systems.

[0050] It should be noted that the partial discharge analog signal conditioning module in this embodiment of the invention can be a mature conditioning circuit in the field of cable partial discharge technology. This conditioning circuit includes a filtering stage, an amplification stage, and a waveform conditioning stage, which will not be described in detail here. The carrier analog signal bidirectional conditioning module 23 internally includes an amplification stage and an attenuation stage. These two stages can be implemented using mature operational amplifiers in the prior art, which will not be described in detail here. The RF digital-to-analog / analog-to-digital conversion module 24 is composed of mature digital-to-analog conversion circuits and analog-to-digital conversion circuits in the prior art, which will not be described in detail here.

[0051] In one specific embodiment, such as Figure 8As shown, the integrated sensing system for partial discharge and carrier communication of cables also includes: a control and analysis host 5, which is connected to the third terminal of the radio frequency digital-to-analog / analog-to-digital converter module 24. The control and analysis host 5 is used to extract the basic characteristics of the partial discharge signal, send data to the radio frequency digital-to-analog / analog-to-digital converter module 24, and receive the processed carrier analog signal.

[0052] Specifically, when operating in partial discharge detection mode, RF switch 21 switches and connects induction coil 12 and partial discharge analog signal conditioning module. RF digital-to-analog / analog-to-digital converter module 24 acquires the partial discharge signal and sends it to control and analysis host 5 for analysis and processing. When the sensing system operates in carrier communication mode, RF switch 21 switches and connects induction coil 12 and carrier analog signal bidirectional conditioning module 23. RF digital-to-analog / analog-to-digital converter module 24 receives commands from control and analysis host 5, establishes physical layer communication connection for carrier communication, and completes carrier networking and signal transmission.

[0053] In addition to monitoring, communication, and control functions, the control and analysis host 5 also serves as an important human-machine interface. Due to the long cable lines, personnel often cannot simultaneously monitor all installation points of the system described in this invention during maintenance. The control and analysis host 5 is responsible for sharing and storing the status monitoring results of the entire monitored line within the carrier communication system. During maintenance, personnel can physically access the control and analysis host 5 at any node along the monitored cable line to view comprehensive information, including monitoring results from all nodes.

[0054] Furthermore, the high-frequency magnetic core 11 and the induction coil 12 are typically packaged as a single unit and mounted on the cable grounding wire 4 as the front-end sensor 1 of the system. The radio frequency conditioning assembly 2 and the control and analysis host 5 are packaged as a single unit and mounted on a robust wall near the cable. The two parts are connected by the radio frequency connection assembly 3.

[0055] Furthermore, such as Figure 9 As shown, this embodiment of the invention performs transmission loss tests on a traditional carrier communication (PLC) coupler and the integrated sensing and transmission system for cable partial discharge and carrier communication proposed in this embodiment of the invention. Figure 9 In the figure, the PLC curve is the full-band transmission loss curve of a traditional carrier communication coupler, and the HFCT1 curve and HFCT2 curve are the full-band transmission loss curves of the high-frequency partial discharge sensor (sensor 1) of the integrated system of the present invention as a carrier communication coupler. The HFCT1 curve and HFCT2 curve correspond to different models of sensor 1.

[0056] As shown in the figure, when the high-frequency partial discharge sensor (sensor 1) of this embodiment is used as a carrier communication coupler, its transmission loss is basically equivalent to that of a traditional carrier communication coupler. Therefore, the integrated system proposed in this embodiment is fully operable.

[0057] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A cable partial discharge and carrier wave communication sensing-integrated system, characterized by, The system comprises: a sensor, a radio frequency conditioning assembly, wherein a first end of the sensor is sleeved on a grounding wire of a cable, a second end of the sensor is connected with a first end of the radio frequency conditioning assembly, and a second end of the radio frequency conditioning assembly is connected with a peripheral controller; when the integrated system works in a partial discharge detection mode, the radio frequency conditioning assembly is switched to a corresponding radio frequency processing loop, when the cable discharges, the sensor senses and outputs a high-frequency pulse voltage signal, the radio frequency processing loop processes the high-frequency pulse voltage signal to obtain a partial discharge signal, and the peripheral controller extracts basic features of the partial discharge signal; when the integrated system works in a carrier wave communication mode, the radio frequency conditioning assembly is switched to a corresponding radio frequency processing loop, the peripheral controller sends a carrier wave digital signal to the radio frequency processing loop, the radio frequency processing loop processes the carrier wave digital signal to obtain a carrier wave analog signal, the sensor senses the carrier wave analog signal and generates a high-frequency electromagnetic field, and the high-frequency electromagnetic field is coupled to a grounding wire loop of the cable; meanwhile, another sensor inside an integrated system working in the carrier wave communication mode senses the high-frequency electromagnetic field to obtain a second carrier wave analog signal, and a corresponding radio frequency processing loop inside the integrated system processes the second carrier wave analog signal and transmits the second carrier wave analog signal to a peripheral controller connected with the radio frequency processing loop.

2. The electric cable partial discharge and carrier wave communication sensor integration system of claim 1, wherein, The system further comprises: a radio frequency connecting assembly, a first end of the radio frequency connecting assembly is connected with a second end of the sensor, and a second end of the radio frequency connecting assembly is connected with a first end of the radio frequency conditioning assembly.

3. The electric cable partial discharge and carrier wave communication sympathetic integration system according to claim 2, characterized by, The sensor comprises: a high-frequency magnetic core and an induction coil, wherein the high-frequency magnetic core is sleeved on a grounding wire of a cable, the induction coil is wound on the high-frequency magnetic core, and two ends of the induction coil are connected with a first end of the radio frequency connecting assembly.

4. The electric cable partial discharge and carrier wave communication sensor integration system of claim 3, wherein, The radio frequency conditioning assembly comprises: a radio frequency switch, a local analog signal conditioning module, a carrier wave analog signal bidirectional conditioning module, and a radio frequency digital-to-analog / analog-to-digital conversion module, wherein a first end of the radio frequency switch is connected with a second end of the radio frequency connecting assembly, a second end of the radio frequency switch is connected with a first end of the local analog signal conditioning module, and a third end of the radio frequency switch is connected with a first end of the carrier wave analog signal bidirectional conditioning module; a second end of the local analog signal conditioning module is connected with a first end of the radio frequency digital-to-analog / analog-to-digital conversion module; a second end of the carrier wave analog signal bidirectional conditioning module is connected with a second end of the radio frequency digital-to-analog / analog-to-digital conversion module; a third end of the radio frequency digital-to-analog / analog-to-digital conversion module is connected with the peripheral controller.

5. The cable partial discharge and carrier wave communication sensing integrated system according to claim 4, wherein When working in the partial discharge detection mode, the radio frequency switch is disconnected with the carrier analog signal bidirectional conditioning module and connected with the local analog signal conditioning module, and when the cable is discharged, the sensor induces a high-frequency pulse voltage signal, the local analog signal conditioning module sends the high-frequency pulse voltage signal to the radio frequency digital-analog / analog-digital conversion module after filtering and denoising, amplifying and waveform shaping, the radio frequency digital-analog / analog-digital conversion module converts the processed high-frequency pulse voltage signal into a partial discharge signal and sends it to the external controller.

6. The cable partial discharge and carrier communication sensing integrated system according to claim 4, characterized in that, When working in the carrier communication mode, the radio frequency switch is disconnected with the local analog signal conditioning module and connected with the carrier analog signal bidirectional conditioning module, the external controller sends a carrier digital signal to the radio frequency digital-analog / analog-digital conversion module, the radio frequency digital-analog / analog-digital conversion module converts the carrier digital signal into a carrier analog small signal and sends it to the carrier analog signal bidirectional conditioning module, the carrier analog signal bidirectional conditioning module amplifies the carrier analog small signal to obtain a carrier analog signal and sends it to the sensor, the sensor senses the carrier analog signal and generates a high-frequency electromagnetic field, the high-frequency electromagnetic field is coupled to the ground loop of the cable; at the same time, the sensor inside the integrated system working in the carrier communication mode senses the high-frequency electromagnetic field to obtain a carrier analog signal, the carrier analog signal bidirectional conditioning module and the radio frequency digital-analog / analog-digital conversion module inside the integrated system sequentially attenuate and analog-digital convert the carrier analog signal to obtain a carrier digital signal and send it to the connected external controller.

7. The electric cable partial discharge and carrier wave communication sympathetic integration system according to claim 4, characterized by, Further comprising: A control analysis host connected with the third end of the radio frequency digital-analog / analog-digital conversion module, the control analysis host is used for extracting partial discharge signal basic characteristics, sending data to the radio frequency digital-analog / analog-digital conversion module, and receiving processed carrier analog signals.

8. The electric cable partial discharge and carrier wave communication sympathetic integration system according to claim 7, characterized by, The radio frequency conditioning assembly is packaged with the control analysis host as a whole.

9. The electric cable partial discharge and carrier wave communication sympathetic integration system according to claim 3, characterized by, The high-frequency magnetic core is packaged with the induction coil as a whole.

10. The integrated system for sensing partial discharge and carrier wave communication of a power cable according to any one of claims 1-9, characterized in that, The front-end sensor, the internal high-frequency magnetic core and the induction coil are multiplexed in a time-division multiplexing form, and the partial discharge detection and carrier communication are implemented on the same physical entity.

Images