Carrier communication system based on cable shielding layer

Abstract

The invention relates to the technical field of power systems, in particular to a carrier communication system based on a cable shielding layer. Comprising a cross interconnection module, a communication module and a communication master station, the cross interconnection module comprises a three-phase cable, shielding layers of the three-phase cable are in cross interconnection to form three shielding layer communication paths, and the communication module is configured to be in combined connection with at least one shielding layer communication path in the three shielding layer communication paths. High-frequency backflow channels of different carrier signal transmission modes are formed, and the communication module is coupled with a shielding layer communication path of the cable to communicate with a communication master station. High-frequency backflow channels of different transmission modes are utilized, effective transmission and backflow of carrier signals are guaranteed, the influence of external interference on communication is reduced, the transmission quality and anti-interference capacity of the signals are improved, the reliability and stability of communication are improved, an existing shielding layer structure is fully utilized, the requirement for additional wiring is avoided, and the cost is reduced. The method is suitable for transformation and upgrading of old 110kV cable channels.

Description

Technical Field

[0001] The invention relates to the technical field of power systems, in particular to a carrier communication system based on a cable shielding layer. Background Art

[0002] At present, the old 110kV cable trench faces problems such as difficult communication signal transmission and large noise interference due to the long time and technical limitations. In order to solve these problems, a new technical solution is needed to achieve reliable communication and broadband transmission. In the carrier communication technology of the power system, since the cable outer sheath is well protected, the cable shielding layer is used as the condition of the communication signal transmission carrier. With the help of the power cable shielding layer for data transmission, there is no need to lay communication cables or build a wireless data transmission system. In addition, the cable shielding layer will not be in direct contact with the energized conductor core, and there will be a shielding frame and a cross-linking layer in the middle for isolation. Using the cable shielding layer as a carrier for high-frequency signal transmission can basically eliminate the noise generated by electromagnetic induction of large currents in the power line. Although the current technology is mainly used for medium-voltage (10kV and 35kV) cable distribution network automation communication due to the very fast signal attenuation when the high-frequency signal is transmitted in the cable shielding layer, the communication distance is often limited to 5km, which leads to its main application in cable medium-voltage (10kV and 35kV) distribution network automation communication, and has not been applied to high-voltage cross-connected cable communication. However, since the length of a cross-connected cable section will not exceed 5km, it is feasible to use high-frequency signal carrier communication based on the cable shielding layer to achieve broadband communication transformation of old 110kV cable channels. Summary of the invention

[0003] The technical problem to be solved by the embodiments of the present invention is to provide a carrier communication system based on the cable shielding layer to solve the problems of difficult communication signal transmission and large noise interference faced by old 110kV cable channels in the prior art due to age, technical limitations and other reasons.

[0004] The invention discloses a carrier communication system based on a cable shielding layer, comprising a cross-connection module, a communication module and a communication master station;

[0005] The cross-interconnection module includes a three-phase cable with shielding layers cross-interconnected to form three shielding layer communication paths;

[0006] The communication module is configured to be combined and connected with at least one of the three shielding layer communication paths to form a high-frequency return channel with different transmission modes of the carrier signal, and the communication module communicates with the communication master station through coupling with the shielding layer communication path.

[0007] Optionally, the communication module includes a metal box and a power line data transmission device arranged in the metal box, the power line data transmission device includes a carrier device and a coupler, the input port of the coupler is connected to the shielding layer communication path of the cable, and is used to inject or extract high-frequency signals into or extract high-frequency signals from the shielding layer of the cable, the carrier device and the coupler are electrically connected, and the shielding layer communication path of the cable communicates with the communication master station through the carrier device.

[0008] Optionally, the communication module is configured to be connected to the two shielding layer communication paths, the input port of the coupler is connected to the shielding layer communication path of one phase of the cable, and the output port of the coupler is connected to the shielding layer communication path of another phase of the cable, so that the coupler and the shielding layer communication paths of the two phases of the cable constitute a high-frequency return channel for the carrier signal.

[0009] Optionally, the communication module is configured to be connected to the three shielding layer communication paths, the input port of the coupler is respectively connected to the shielding layer communication paths of two phases of the cable, and the output port of the coupler is connected to the shielding layer communication path of another phase of the cable, so that the coupler and the shielding layer communication paths of the three-phase cables constitute a high-frequency return channel for the carrier signal.

[0010] Optionally, the communication module is configured to be connected to one of the shielding layer communication paths, the input port of the coupler is connected to the shielding layer communication path of one phase of the cable, and the output port of the coupler is grounded, so that the coupler, the shielding layer of one phase of the cable and the ground constitute a high-frequency return channel for the carrier signal.

[0011] Optionally, the communication module is configured to be connected to the two shielding layer communication paths, the input port of the coupler is respectively connected to the shielding layer communication paths of two phases of the cable, and the output port of the coupler is grounded, so that the coupler, the shielding layers of the two phases of the cable and the ground constitute a high-frequency return channel for the carrier signal.

[0012] Optionally, the communication module is configured to be connected to the three shielding layer communication paths, the input port of the coupler is respectively connected to the shielding layer communication paths of the three-phase cables, and the output port of the coupler is grounded, so that the coupler, the shielding layers of the three-phase cables and the ground constitute a high-frequency return channel for the carrier signal.

[0013] Optionally, grounding nodes are arranged at both ends of the three-phase cable, the three-phase cable is connected to a communication module at the grounding node, and the metal box at the grounding node constitutes a direct grounding box;

[0014] A plurality of cross-connection nodes are arranged between the two ends of the three-phase cable, the three-phase cable is connected to a communication module at the cross-connection node, and the metal box at the cross-connection node constitutes a cross-connection box;

[0015] The communication module communicates with the other communication modules through the shielding layer communication path of the three-phase cable.

[0016] Optionally, the carrier devices at the grounding node and the cross-interconnection node constitute a data sending end by communicating with terminal equipment in the cable channel environment, and the carrier device at the grounding node constitutes a data receiving end by communicating with the communication master station.

[0017] Optionally, the carrier communication system includes a plurality of the cross-interconnection modules, and the adjacent grounding nodes of two adjacent cross-interconnection modules share one direct grounding box, and the direct grounding box is configured with one carrier device and two couplers, and the two couplers and the grounding nodes of the two cross-interconnection modules are connected one-to-one.

[0018] Compared with the prior art, the carrier communication system based on the cable shielding layer provided by the embodiment of the present invention has the following beneficial effects:

[0019] The shielding layers of three-phase cables are cross-interconnected to form three shielding layer communication paths. The communication module is configured to be connected to at least one of the three shielding layer communication paths, forming a high-frequency return channel with different transmission modes of the carrier signal. The communication module communicates with the communication master station through coupling with the shielding layer communication path. The signal is transmitted through the shielding layer communication path of the three-phase cable, realizing power line carrier communication, ensuring the effective transmission and return of the carrier signal, reducing the impact of external interference on communication, so as to improve the transmission quality and anti-interference ability of the signal, thereby improving the reliability and stability of communication. It also simplifies the structure of the communication system, does not require additional laying of communication lines, reduces engineering costs and construction difficulties, makes full use of existing cable resources for data transmission, and is suitable for the transformation and upgrading of old 110kV cable trenches. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments, in which:

[0021] Figure 1 A schematic diagram of a closed path for high-frequency signal transmission in a shielding layer-shielding layer transmission mode 1 provided in an embodiment of the present invention;

[0022] Figure 2 A schematic diagram of a carrier communication system architecture of a shielding layer-shielding layer transmission mode 1 provided in an embodiment of the present invention;

[0023] Figure 3 A schematic diagram of a closed path for high-frequency signal transmission in shielding layer-shielding layer transmission mode 2 provided in an embodiment of the present invention;

[0024] Figure 4 A schematic diagram of a carrier communication system architecture of shielding layer-shielding layer transmission mode 2 provided in an embodiment of the present invention;

[0025] Figure 5 A schematic diagram of a closed path for high-frequency signal transmission in a shielding layer-ground transmission mode 1 provided in an embodiment of the present invention;

[0026] Figure 6 A schematic diagram of the architecture of a carrier communication system of a shielding layer-ground transmission mode 1 provided in an embodiment of the present invention;

[0027] Figure 7 A schematic diagram of a closed path for high-frequency signal transmission in the shielding layer-ground transmission mode 2 provided in an embodiment of the present invention;

[0028] Figure 8 A schematic diagram of the architecture of a carrier communication system of shielding layer-ground transmission mode 2 provided by an embodiment of the present invention;

[0029] Fig. 9 A schematic diagram of a closed path for high-frequency signal transmission in transmission mode three of the shielding layer-ground provided in an embodiment of the present invention;

[0030] Fig.10 A schematic diagram of the architecture of a carrier communication system of shielding layer-ground transmission mode three provided in an embodiment of the present invention.

[0031] The reference numerals in the figures are:

[0032] 1. Cross-connection module; 11. A-phase cable; 12. B-phase cable; 13. C-phase cable; 2. Communication module; 21. Metal box; 22. Carrier device; 23. Coupler; 3. Communication master station. DETAILED DESCRIPTION

[0033] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. Now, in conjunction with the accompanying drawings, the preferred embodiments of the present invention are described in detail.

[0034] The present invention discloses a carrier communication system based on a cable shielding layer, such as Figure 1-Figure 10As shown, it includes a cross-interconnection module 1, a communication module 2 and a communication master station 3. The cross-interconnection module includes a three-phase cable with three shielded layer communication paths formed by cross-interconnection of the shielded layer. The communication module 2 is configured to be combined and connected with at least one of the three shielded layer communication paths to form a high-frequency return channel with different transmission modes of the carrier signal, and the communication module 2 communicates with the communication master station 3 by coupling with the shielded layer communication path of the cable.

[0035] Through the implementation method of the above-mentioned carrier communication system, the shielding layers of the three-phase cable are cross-interconnected to form three shielding layer communication paths, and the communication module 2 is configured to be combined and connected with at least one of the three shielding layer communication paths to form a high-frequency return channel with different transmission modes of the carrier signal, so that the communication module 2 can communicate with the communication master station 3 by coupling with the shielding layer communication path of the cable, and the signal is transmitted through the shielding layer communication path of the three-phase cable to realize power line carrier communication, ensure the effective transmission and return of the carrier signal, reduce the influence of external interference on the communication, so as to improve the transmission quality and anti-interference ability of the signal, thereby improving the reliability and stability of the communication.

[0036] As mentioned above, the three-phase cables are respectively A-phase cable 11, B-phase cable 12 and C-phase cable 13. In a cross-interconnection module 1, the shielding layer of the single-phase cable is divided into three sections, and a cross-interconnection interval is formed between two adjacent shielding layers. For example: A-phase cable 11 includes A1 section metal shielding layer, A2 section metal shielding layer and A3 section metal shielding layer; B-phase cable 12 includes B1 section metal shielding layer, B2 section metal shielding layer and B3 section metal shielding layer; C-phase cable 13 includes C1 section metal shielding layer, C2 section metal shielding layer and C3 section metal shielding layer. The cross-interconnection of the shielding layers of the three-phase cables constitutes a specific wiring method with three shielding layer communication paths as shown in the figure. Figure 1 As shown, at this time, the shielding layer communication path of the A-phase cable 11 is: section A1 metal shielding layer-section B2 metal shielding layer-section C3 metal shielding layer; the shielding layer communication path of the B-phase cable 12 is: section B1 metal shielding layer-section C2 metal shielding layer-section A3 metal shielding layer; the shielding layer communication path of the C-phase cable 13 is: section C1 metal shielding layer-section A2 metal shielding layer-section B3 metal shielding layer.

[0037] Further, the communication module 2 includes a metal box 21 and a power line data transmission device arranged in the metal box 21. The power line data transmission device includes a carrier device 22 and a coupler 23. The input port of the coupler 23 is connected to the shielding layer communication path of the cable, and is used to inject or extract high-frequency signals into the shielding layer of the cable. The carrier device 22 and the coupler 23 are electrically connected, and the shielding layer communication path of the cable communicates with the communication master station 3 through the carrier device 22.

[0038] Through the implementation method of the above-mentioned carrier communication system, the communication module 2 is composed of a metal box 21 and an internal power line data transmission device. The metal box 21 improves the anti-interference ability and protection level of the power line data transmission device, reduces the impact of the external environment on the internal system of the metal box 21, and ensures the stability and safety of the entire communication module 2. At the same time, the carrier device 22 is connected to the shielding layer communication path of the cable through the coupler 23, and an injection coupler 23 is used to inject or extract high-frequency signals into the shielding layer of the cable, so that the signal is transmitted through the shielding layer communication path of the cable, realizing power line carrier communication, ensuring the effective transmission and return of the carrier signal, reducing the impact of external interference on communication, so as to improve the transmission quality and anti-interference ability of the signal, thereby improving the reliability and stability of communication. It also simplifies the structure of the communication system, does not require additional laying of communication lines, and reduces engineering costs and construction difficulties. In addition, by injecting or extracting high-frequency signals through the coupler 23, data interaction and control with external devices can be realized, which improves the flexibility and scalability of the system. Among them, the coupler 23 is preferably an inductive coupler or a composite coupler based on transformer and capacitor coupling.

[0039] Furthermore, combined with Figure 1 and Figure 2 As shown, the communication module 2 is configured to be connected to two shielded layer communication paths, the input port of the coupler 23 is connected to the shielded layer communication path of one phase cable, and the output port of the coupler 23 is connected to the shielded layer communication path of the other phase cable, so that the coupler 23 and the shielded layer communication paths of the two-phase cables constitute a high-frequency return channel for the carrier signal.

[0040] Through the implementation of the above carrier communication system, the shield-shield transmission mode 1 is adopted for the 110kV cable line: the signal is transmitted through the shield communication path of one phase cable, and transmitted back through the shield communication path of the other phase cable. For example: the shield communication path of the A phase cable 11 and the C phase cable 13 is used as the high-frequency signal transmission closed path, and the shield communication path of the A phase cable 11 is used as the high-frequency signal input path ( Figure 1 The shielding layer communication path of the C-phase cable 13 is used as the high-frequency signal return path ( Figure 1 The signal is injected into the shield layer communication path of the A-phase cable through the coupler 23 and transmitted back from the shield layer communication path of the C-phase cable 13. Once the signal reaches the destination node, the coupler 23 at the node extracts the signal and sends it to the communication master station 3 through the carrier device 22. The shield layer structure of the existing cable is fully utilized, the need for additional wiring is avoided, the system cost is reduced, and efficient and stable data transmission can be achieved, which is suitable for the transformation and upgrading of old 110kV cable trenches.

[0041] Furthermore, combined with Figure 3 and Figure 4 As shown, the communication module 2 is configured to be connected to three shielded layer communication paths, the input port of the coupler 23 is respectively connected to the shielded layer communication paths of two-phase cables, and the output port of the coupler 23 is connected to the shielded layer communication path of another phase cable, so that the coupler 23 and the shielded layer communication paths of the three-phase cables constitute a high-frequency return channel for the carrier signal.

[0042] Through the implementation of the above carrier communication system, the shield-shield transmission mode 2 is adopted for the 110kV cable line: the signal is transmitted through the shield communication path of the two-phase cable and transmitted back through the shield communication path of the third-phase cable. For example: the shield communication path of the A-phase cable 11 and the C-phase cable 13 is used as the high-frequency signal input path ( Figure 3 The shielding layer communication path of the B-phase cable 12 is used as the high-frequency signal return path ( Figure 3 The coupler 23 includes two groups of input and output ports, one group of which is connected to the A-phase cable 11 and the B-phase cable 12, and the other group of which is connected to the C-phase cable 13 and the B-phase cable 12. At this time, the signal is injected into the shielding layer communication path of the A-phase cable 11 and the C-phase cable 13 through the coupler 23 at the same time, forming a parallel communication path, improving the anti-interference ability of the signal, and is transmitted back from the shielding layer communication path of the B-phase cable 12. The signals on the two parallel high-frequency signal input paths back up each other during the transmission process. Even if there is a problem with the shielding layer communication path of one phase, the signal can still be smoothly transmitted to the communication master station 3 through the shielding layer communication path of the other phase. This mode is suitable for use in occasions where the reliability of the cable shielding layer is high but the environmental interference is large. It can significantly improve the stability of the system and the reliability of data transmission, or the signals on the two-phase shielding layer can choose to transmit different signals to ensure the communication rate.

[0043] Furthermore, combined with Figure 5 and Figure 6 As shown, the communication module 2 is configured to be connected to a shielded layer communication path. The input port of the coupler 23 is connected to the shielded layer communication path of a phase cable, and the output port of the coupler 23 is grounded, so that the coupler 23, the shielded layer of the phase cable and the ground constitute a high-frequency return channel for the carrier signal.

[0044] Through the implementation of the above carrier communication system, the shield-ground transmission mode 1 is adopted for the 110kV cable line: the signal is transmitted through the shield communication path of one phase cable and transmitted back through the ground. For example: the shield communication path of the B phase cable 12 is used as the high-frequency signal input path ( Figure 5 The earth is used as the return path for high-frequency signals ( Figure 5At this time, the signal is injected into the shielding layer communication path of the B-phase cable 12 through the coupler 23, which improves the anti-interference ability of the signal and is transmitted back from the ground. Using the ground as the signal return path simplifies the wiring requirements. This mode is suitable for situations where the shielding layer is reliably grounded but the multi-phase shielding layer communication conditions are not met. Since there is no need to rely on the shielding layer of the multi-phase cable for signal return, the complexity and cost of system installation can be reduced. In addition, through the earth transmission loop, the impact of electromagnetic interference can be reduced to a certain extent and the quality of the communication signal can be improved. Especially in the reconstruction of old cable trenches, a simple and effective solution is provided.

[0045] Furthermore, combined with Figure 7 and Figure 8 As shown, the communication module 2 is configured to be connected to two shielded layer communication paths. The input port of the coupler 23 is respectively connected to the shielded layer communication paths of the two-phase cables. The output port of the coupler 23 is grounded so that the coupler 23, the shielded layers of the two-phase cables and the earth constitute a high-frequency return channel for the carrier signal.

[0046] Through the implementation of the above carrier communication system, the shield-ground transmission mode 2 is adopted for the 110kV cable line: the signal is transmitted through the shield communication path of the two-phase cable and transmitted back through the ground. For example: the shield communication path of the A-phase cable 11 and the C-phase cable 13 is used as the high-frequency signal input path ( Figure 7 The earth is used as the return path for high-frequency signals ( Figure 7 The coupler 23 includes two groups of input and output ports, one group of which is connected to the A-phase cable 11 and the earth, and the other group of input and output ports is connected to the C-phase cable 13 and the earth. At this time, the signal is injected into the shielding layer communication path of the A-phase cable 11 and the C-phase cable 13 through the coupler 23 at the same time, forming a parallel communication path, improving the anti-interference ability of the signal, and transmitted back from the earth. The shielding layer communication path of the two-phase cable is combined with the communication path of the earth to provide higher communication redundancy and reliability. Compared with the shielding layer-to-ground transmission mode 1, the shielding layer-to-ground transmission mode 2 of this embodiment further improves the stability and anti-interference ability of signal transmission through the shielding layer communication path of the two-phase cable. Even if one of the phases has a problem, the other phase can still maintain the normal operation of the communication link. This mode is suitable for application scenarios that require higher data transmission stability, such as key communication nodes in power systems. In addition, this mode can also be similar to the shielding layer-to-shielding layer transmission mode 2, and different signals can be selected to ensure the communication rate.

[0047] Furthermore, combined with Fig. 9 and Fig.10As shown, the communication module 2 is configured to be connected to three shield layer communication paths. The input port of the coupler 23 is respectively connected to the shield layer communication paths of the three-phase cable, and the output port of the coupler 23 is grounded, so that the coupler 23, the shield layer of the three-phase cable and the earth constitute a high-frequency return channel for the carrier signal.

[0048] Through the implementation of the above carrier communication system, the shield-ground transmission mode 3 is adopted for the 110kV cable line: the signal is transmitted through the shield communication path of the three-phase cable and transmitted back through the ground. For example: the shield communication path of the A phase cable 11, the B phase cable 12 and the C phase cable 13 is used as the high-frequency signal input path ( Fig. 9 The earth is used as the return path for high-frequency signals ( Fig. 9 The coupler 23 includes three groups of input and output ports, one group of which is connected to the A-phase cable 11 and the earth, another group of which is connected to the B-phase cable 12 and the earth, and another group of which is connected to the C-phase cable 13 and the earth. At this time, the shielding layer communication paths of the A-phase cable 11, the B-phase cable 12 and the C-phase cable 13 are simultaneously injected through the coupler 23 and transmitted back from the earth. By utilizing the transmission capacity of the three-phase cable shielding layer communication path, signals of different frequencies can be transmitted simultaneously, and multi-channel signal parallel transmission can be realized. The advantage of this mode is that it can provide a larger communication bandwidth and a higher data transmission speed, which is suitable for situations where large-capacity data transmission is required. Through the joint action of the three-phase cable shielding layer communication path and the earth, the stability and reliability of signal transmission are ensured, while reducing the risk of communication interruption due to single channel failure. It is particularly suitable for scenarios with high communication capacity requirements in modern smart grids.

[0049] Furthermore, grounding nodes are arranged at both ends of the three-phase cable, the three-phase cable is connected to a communication module 2 at the grounding node, and the metal box 21 at the grounding node constitutes a direct grounding box;

[0050] A plurality of cross-connection nodes are arranged between the two ends of the three-phase cable, the three-phase cable is connected to a communication module 2 at the cross-connection node, and the metal box 21 at the cross-connection node constitutes a cross-connection box;

[0051] The communication module 2 communicates with other communication modules 2 via the shielded layer communication path of the three-phase cable.

[0052] Through the implementation method of the above carrier communication system, the two ends of the three-phase cable are directly grounded, and the joints at the intermediate cross-interconnection nodes are grounded through the shielding layer protector to form a closed path with low impedance. On this basis, the metal box 21 at the grounding node constitutes a direct grounding box, and the metal box 21 can be connected to the grounding terminal through a grounding wire, and then connected to the ground, so that when the equipment has leakage or other faults, the current can quickly flow into the ground through the grounding wire, thereby avoiding the risk of electric shock to personnel, ensuring the stability and safety of the entire communication module 2, and protecting the cable and equipment from lightning strikes and overcurrent. In addition, the cross-interconnection box is formed by the metal box 21 at the cross-interconnection node to reduce the inductance and capacitance in the cable line and improve the transmission characteristics of the cable. On the other hand, the communication module 2 communicates with the remaining communication modules 2 through the shielding layer communication path of the three-phase cable, and a group of communication modules 2 can be used for every three sections (a cross-interconnection module), and each node only needs one coupler 23, and the current injected by coupling circulates through the shielding layer communication path, and uses it to establish communication between nodes to achieve data exchange and sharing between each communication module 2. This communication method uses the shielding layer of the cable as the communication medium, does not require the laying of additional communication lines, and reduces engineering costs and construction difficulty.

[0053] Furthermore, the carrier device 22 at the grounding node and the cross-interconnection node constitutes a data sending end by communicating with the terminal equipment in the cable channel environment, and the carrier device 22 at the grounding node constitutes a data receiving end by communicating with the communication main station 3.

[0054] Through the implementation method of the above-mentioned carrier communication system, during the signal transmission process, at a single node, the carrier device 22 transmits the data signal to the coupler 23 through the RS232 or RS485 interface, and the coupler 23 injects the data signal into the sheath of the cable. Once the signal reaches the destination node, the coupler 23 at the data receiving end extracts the data signal and sends it to the background master station through the carrier device 22, so as to realize the mutual communication between the data signal at each node and the background master station, so that the monitoring personnel can centrally manage and monitor the communication modules 2 at multiple nodes through the background master station, thereby improving the management efficiency of the system. In addition, it is only necessary to add a new communication module 2 at the required position, and perform corresponding configuration and connection to realize the expansion of the system to meet the needs of different application scenarios.

[0055] Furthermore, the carrier communication system includes multiple cross-interconnection modules 1, and the adjacent grounding nodes of two adjacent cross-interconnection modules 1 share a direct grounding box, and the direct grounding box is configured with a carrier device 22 and two couplers 23, and the two couplers 23 are connected to the grounding nodes of the two cross-interconnection modules 1 in a one-to-one correspondence.

[0056] Through the implementation of the carrier communication system described above, the grounding nodes adjacent to two adjacent cross-interconnection modules 1 share a direct grounding box, and the power line data transmission device in the direct grounding box plays a relay role in data transmission between the two cross-interconnection modules 1. In the accompanying drawings corresponding to each transmission mode, the 4# direct grounding box is a relay grounding box, and the two couplers 23 in it must be coupled to the two cross-interconnection modules 1 at the same time to ensure signal transmission.

[0057] It should be understood that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. For those skilled in the art, the technical solutions described in the above embodiments can be modified, or some of the technical features therein can be replaced by equivalents; and all these modifications and replacements should fall within the protection scope of the claims attached to the present invention.

Claims

1. A carrier communication system based on a cable shielding layer, characterized in that: The carrier communication system includes a cross-connection module, a communication module and a communication master station; The cross-interconnection module includes a three-phase cable with shielding layers cross-interconnected to form three shielding layer communication paths; The communication module is configured to be combined and connected with at least one of the three shielding layer communication paths to form a high-frequency return channel with different transmission modes of the carrier signal, and the communication module communicates with the communication master station through coupling with the shielding layer communication path.

2. The carrier communication system based on the cable shielding layer according to claim 1 is characterized in that: The communication module includes a metal box and a power line data transmission device arranged in the metal box, the power line data transmission device includes a carrier device and a coupler, the input port of the coupler is connected to the shielding layer communication path of the cable, and is used to inject or extract high-frequency signals into the shielding layer of the cable, the carrier device and the coupler are electrically connected, and the shielding layer communication path of the cable communicates with the communication master station through the carrier device.

3. The carrier communication system based on the cable shielding layer according to claim 2 is characterized in that: The communication module is configured to be connected to the two shielded layer communication paths, the input port of the coupler is connected to the shielded layer communication path of one phase of the cable, and the output port of the coupler is connected to the shielded layer communication path of another phase of the cable, so that the coupler and the shielded layer communication paths of the two phases of the cable constitute a high-frequency return channel for the carrier signal.

4. The carrier communication system based on the cable shielding layer according to claim 2 is characterized in that: The communication module is configured to be connected to the three shielded layer communication paths, the input port of the coupler is respectively connected to the shielded layer communication paths of two phases of the cable, and the output port of the coupler is connected to the shielded layer communication path of another phase of the cable, so that the coupler and the shielded layer communication paths of the three-phase cables constitute a high-frequency return channel for the carrier signal.

5. The carrier communication system based on the cable shielding layer according to claim 2 is characterized in that: The communication module is configured to be connected to one of the shielding layer communication paths, the input port of the coupler is connected to the shielding layer communication path of one phase of the cable, and the output port of the coupler is grounded, so that the coupler, the shielding layer of one phase of the cable and the ground constitute a high-frequency return channel for the carrier signal.

6. The carrier communication system based on the cable shielding layer according to claim 2 is characterized in that: The communication module is configured to be connected to the two shielding layer communication paths, the input port of the coupler is respectively connected to the shielding layer communication paths of two phases of the cable, and the output port of the coupler is grounded, so that the coupler, the shielding layers of the two phases of the cable and the ground constitute a high-frequency return channel for the carrier signal.

7. The carrier communication system based on the cable shielding layer according to claim 2 is characterized in that: The communication module is configured to be connected to the three shielding layer communication paths, the input port of the coupler is respectively connected to the shielding layer communication paths of the three-phase cables, and the output port of the coupler is grounded, so that the coupler, the shielding layers of the three-phase cables and the ground constitute a high-frequency return channel for the carrier signal.

8. The carrier communication system based on cable shielding layer according to claim 2 is characterized in that: Grounding nodes are arranged at both ends of the three-phase cable, the three-phase cable is connected to a communication module at the grounding node, and the metal box at the grounding node constitutes a direct grounding box; A plurality of cross-connection nodes are arranged between the two ends of the three-phase cable, the three-phase cable is connected to a communication module at the cross-connection node, and the metal box at the cross-connection node constitutes a cross-connection box; The communication module communicates with the other communication modules through the shielding layer communication path of the three-phase cable.

9. The carrier communication system based on the cable shielding layer according to claim 8, characterized in that: The carrier devices at the grounding node and the cross-interconnection node constitute a data sending end by communicating with the terminal equipment in the cable channel environment, and the carrier device at the grounding node constitutes a data receiving end by communicating with the communication main station.

10. The carrier communication system based on the cable shielding layer according to claim 9, characterized in that: The carrier communication system includes a plurality of the cross-interconnection modules, and the adjacent grounding nodes of two adjacent cross-interconnection modules share one direct grounding box, and the direct grounding box is configured with one carrier device and two couplers, and the two couplers and the grounding nodes of the two cross-interconnection modules are connected one-to-one.

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