Transmission line shielding detection circuit and transmission line system

Abstract

The present invention discloses a transmission line shielding detection circuit and a transmission line system, comprising a leakage detection module, a fracture detection module, a switch module and a control module. The detection end of the leakage detection module is connected to a conductive shielding layer group to detect a leakage signal. The fracture detection module comprises a first detection end and a second detection end. The first detection end of the fracture detection module is connected to one end of the conductive shielding layer group and the second detection end of the fracture detection module is connected to the other end of the conductive shielding layer group to detect a fracture signal. The switch module is connected to a power supply bus group to switch the on-off state of the transmission line of the power supply bus group. The control module is respectively connected to the output end of the leakage detection module, the output end of the fracture detection module and the controlled end of the switch module to control the switch module to disconnect when any one of the leakage signal and the fracture signal is received. The present design responds promptly in the event of leakage or fracture damage, disconnects the transmission line, and improves the power supply safety performance.

Description

Technical Field

[0001] The present invention relates to the technical field of cable equipment, and in particular to a transmission line shielding detection circuit and a transmission line system. Background Art

[0002] Existing power supply transmission lines generally include a power supply bus and a conductive shielding layer mounted on the power supply bus. The conductive shielding layer is used in conjunction with an existing transmission line shielding detection circuit. The transmission line shielding detection circuit generally includes a leakage detection module, a switch module and a control module. The leakage detection module is electrically connected to the conductive shielding layer. The switch module is connected to the power supply bus to switch the on / off state of the transmission line of the power supply bus. The control module is electrically connected to the leakage detection module and the switch module respectively. The control module can control the on / off state of the switch module according to the leakage signal fed back by the leakage detection module. However, when a break occurs in the conductive shielding layer, the electrical signal cannot be transmitted normally in the conductive shielding layer. Even if leakage occurs in some locations, the leakage signal cannot be transmitted to the access point of the leakage detection module, and the safety performance is greatly reduced. Summary of the Invention

[0003] The present invention aims to address at least one of the technical problems existing in the prior art. To this end, the present invention provides a transmission line shield detection circuit and transmission line system that can detect whether there is leakage in the transmission line and promptly respond to any damage to the conductive shielding layer assembly, disconnecting the transmission line and improving power supply safety.

[0004] According to an embodiment of the first aspect of the present invention, a transmission line shielding detection circuit is applied to a power supply busbar group, wherein a conductive shielding layer group is provided on the power supply busbar group, and the shielding detection circuit includes: a leakage detection module, wherein the detection end of the leakage detection module is connected to the conductive shielding layer group to detect a leakage signal, and the leakage signal is used to indicate that leakage occurs between the power supply busbar group and the conductive shielding layer group; a fracture detection module, wherein the fracture detection module includes a first detection end and a second detection end, the first detection end of the fracture detection module is connected to one end of the conductive shielding layer group and the second detection end of the fracture detection module is connected to the other end of the conductive shielding layer group to detect a fracture signal, and the fracture signal is used to indicate that a fracture occurs in the conductive shielding layer group; a switch module, connected to the power supply busbar group to switch the on / off state of the transmission line of the power supply busbar group; and a control module, wherein the control module is respectively connected to the output end of the leakage detection module, the output end of the fracture detection module and the controlled end of the switch module to control the switch module to disconnect when receiving any one of the leakage signal and the fracture signal.

[0005] A transmission line shielding detection circuit according to an embodiment of the present invention has at least the following beneficial effects:

[0006] The transmission line shielding detection circuit of the present invention, when the power supply bus group has leakage, the power supply bus group and the conductive shielding layer group will be connected, thereby, the leakage detection module detects and generates a leakage signal, and when the conductive shielding layer group is broken or damaged, even if the power supply bus group and the conductive shielding layer group are connected, the current may not be able to be transmitted to the leakage detection module, and the fracture detection module is connected to both ends of the conductive shielding layer group to detect the fracture signal. When the control module receives any one of the leakage signal and the fracture signal, the control switch module is disconnected, thereby cutting off the transmission line and ensuring power supply safety. This design can respond in time whether there is leakage in the transmission line or the conductive shielding layer group is broken or damaged, disconnecting the transmission line and improving the power supply safety performance.

[0007] According to some embodiments of the present invention, an overvoltage detection module is further included, which includes a sampling end group. The sampling end group of the overvoltage detection module is connected to the power supply bus group to detect an overvoltage signal. The overvoltage signal is used to indicate that the transmission voltage of the power supply bus group is higher than the overvoltage threshold. The output end of the overvoltage detection module is connected to the control module. The control module controls the switch module to disconnect when receiving any one of the leakage signal, the fracture signal and the overvoltage signal.

[0008] According to some embodiments of the present invention, the overvoltage detection module includes a voltage divider unit and a judgment unit, the input end of the voltage divider unit is connected to the power supply bus group, the output end of the voltage divider unit is connected to the input end of the judgment unit, the judgment unit is used to determine whether the transmission voltage is higher than the overvoltage threshold and form the overvoltage signal accordingly, and the output end of the judgment unit is connected to the control module.

[0009] According to some embodiments of the present invention, the leakage detection module includes a rectifier unit and an isolation unit, one phase of the AC input end of the rectifier unit is connected to the power supply bus group, the other phase of the AC input end of the rectifier unit is connected to the conductive shielding layer group, the DC output end of the rectifier unit is connected to the input end of the isolation unit, and the output end of the isolation unit is connected to the control module.

[0010] According to some embodiments of the present invention, a first step-down power supply module is further included, and the power supply end of the first step-down power supply module is connected to the power supply bus group. The isolation unit includes an optocoupler U2, and the input end of the optical receiver of the optocoupler U2 is connected to the output end of the first step-down power supply module, and the output end of the optical receiver of the optocoupler U2 is connected to the control module.

[0011] According to some embodiments of the present invention, a second step-down power supply module is further included, the power supply end of the second step-down power supply module is connected to the power supply bus group, the output end of the second step-down power supply module is connected to the conductive shielding layer group, the fracture detection module includes a comparison unit, the comparison unit includes a first detection end and a second detection end, the first detection end of the comparison unit is connected to one end of the conductive shielding layer group and the second detection end of the comparison unit is connected to the other end of the conductive shielding layer group, the output end of the comparison unit is connected to the control module, and the fracture signal is generated when the voltages of the first detection end of the comparison unit and the second detection end of the comparison unit are different.

[0012] According to some embodiments of the present invention, the comparison unit includes a switch tube Q3, a resistor R12, a resistor R13, a resistor R14, a diode D4 and a diode D3, one end of the resistor R12 is connected to one end of the conductive shielding layer group, the other end of the resistor R12 is connected to the input electrode of the switch tube Q3, the controlled electrode of the switch tube Q3 is connected to one end of the resistor R13, the other end of the resistor R13 is respectively connected to one end of the resistor R14 and the other end of the conductive shielding layer group, the output electrode of the switch tube Q3 is connected to the positive electrode of the diode D4, the negative electrode of the diode D4 is connected to the control module, the other end of the resistor R14 is connected to the positive electrode of the diode D3, and the negative electrode of the diode D3 is connected to the power supply bus group.

[0013] According to some embodiments of the present invention, the switch module includes a relay unit, the relay unit includes a relay switch and a relay coil capable of driving the relay switch to be on and off, the relay switch is connected to the power supply bus group to switch the on and off state of the transmission line of the power supply bus group, the control module includes a switch tube Q1, the relay coil is connected to the switch tube Q1 to form at least part of a drive power supply circuit, the drive power supply circuit is connected to the power supply bus group, and the controlled pole of the switch tube Q1 is respectively connected to the output end of the leakage detection module and the output end of the fracture detection module.

[0014] According to the second aspect of the present invention, the transmission line system includes a shielding detection circuit and a power supply bus group, wherein the power supply bus group is provided with a conductive shielding layer group; the shielding detection circuit includes: a leakage detection module, the detection end of the leakage detection module is connected to the conductive shielding layer group to detect a leakage signal, and the leakage signal is used to indicate that leakage occurs between the power supply bus group and the conductive shielding layer group; a fracture detection module, the fracture detection module includes a first detection end and a second detection end, the first detection end of the fracture detection module is connected to one end of the conductive shielding layer group and the second detection end of the fracture detection module is connected to the other end of the conductive shielding layer group to detect a fracture signal, and the fracture signal is used to indicate that a fracture occurs in the conductive shielding layer group; a switch module is connected to the power supply bus group to switch the on / off state of the transmission line of the power supply bus group; a control module is respectively connected to the output end of the leakage detection module, the output end of the fracture detection module and the controlled end of the switch module to control the switch module to disconnect when receiving any one of the leakage signal and the fracture signal.

[0015] The transmission line system according to the embodiment of the present invention has at least the following beneficial effects:

[0016] In the transmission line system of the present invention, the power supply bus group realizes the transmission of electric energy. During the transmission process, when the power supply bus group leaks, the power supply bus group and the conductive shielding layer group will be connected. As a result, the leakage detection module detects and generates a leakage signal. When the conductive shielding layer group is broken or damaged, even if the power supply bus group and the conductive shielding layer group are connected, the current may not be able to be transmitted to the leakage detection module. The fracture detection module is connected to both ends of the conductive shielding layer group to detect the fracture signal. When the control module receives any one of the leakage signal and the fracture signal, the control switch module is disconnected, thereby cutting off the transmission line and ensuring power supply safety. This design can respond in time whether there is leakage in the transmission line or the conductive shielding layer group is broken or damaged, disconnecting the transmission line and improving the power supply safety performance.

[0017] According to some embodiments of the present invention, the power supply busbar group includes a first busbar and a second busbar, the conductive shielding layer group includes a conductive first shielding layer and a conductive second shielding layer, the first shielding layer is sleeved on the first busbar, and the second shielding layer is sleeved on the second busbar, the switch module is respectively connected to the first busbar and the second busbar to switch the on and off states of the transmission lines of the first busbar and the second busbar, the detection end of the leakage detection module is connected to the first shielding layer or the second shielding layer, the first detection end of the fracture detection module is connected to one end of the first shielding layer, the second detection end of the fracture detection module is connected to one end of the second shielding layer, and the other end of the first shielding layer is connected to the other end of the second shielding layer.

[0018] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which:

[0020] Figure 1 This is a principle structural block diagram of one embodiment of the shielding detection circuit of the present invention;

[0021] Figure 2 A circuit diagram of one embodiment of a shielding detection circuit of the present invention;

[0022] Figure 3 Schematic diagram of the cross-section structure of the transmission line;

[0023] Figure 4 Schematic diagram of the structure of the first shielding layer.

[0024] Reference numerals:

[0025] Leakage detection module 100; rectifier unit 110; isolation unit 120; fracture detection module 200; switch module 300; relay switch 310; relay coil 320; control module 400; overvoltage detection module 500; voltage divider unit 510; judgment unit 520; first step-down power supply module 610; second step-down power supply module 620; light prompt module 630; first busbar 710; first current-carrying core 711; first insulating layer 712; second busbar 720; second current-carrying core 721; second insulating layer 722; first shielding layer 730; second shielding layer 740; sheath layer 750; non-woven fabric layer 810; conductor body 820; conductive layer assembly 830; first conductive layer 831; second conductive layer 832; power supply busbar group 910; conductive shielding layer group 920. DETAILED DESCRIPTION

[0026] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0027] In the description of the present invention, it should be understood that descriptions involving orientations, such as the orientations or positional relationships indicated by terms such as "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside", are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0028] In the description of the present invention, "several" means one or more, "many" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The use of "first" and "second" in the description is solely for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0029] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0030] like Figure 1 -4, according to a first embodiment of the present invention, a transmission line shielding detection circuit is applied to a power supply busbar group 910, and a conductive shielding layer group 920 is provided on the power supply busbar group 910. The shielding detection circuit includes a leakage detection module 100, a fracture detection module 200, a switch module 300 and a control module 400. The detection end of the leakage detection module 100 is connected to the conductive shielding layer group 920 to detect a leakage signal. The leakage signal is used to indicate that leakage occurs between the power supply busbar group 910 and the conductive shielding layer group 920. The fracture detection module 200 includes a first detection end and a second detection end. The fracture detection module 200 The first detection end of the fracture detection module 200 is connected to one end of the conductive shielding layer group 920 and the second detection end of the fracture detection module 200 is connected to the other end of the conductive shielding layer group 920 to detect a fracture signal. The fracture signal is used to characterize the fracture of the conductive shielding layer group 920. The switch module 300 is connected to the power supply bus group 910 to switch the on / off state of the transmission line of the power supply bus group 910. The control module 400 is respectively connected to the output end of the leakage detection module 100, the output end of the fracture detection module 200 and the controlled end of the switch module 300 to control the switch module 300 to disconnect when receiving any one of the leakage signal and the fracture signal.

[0031] It should be noted that if Figure 3 As shown, the transmission line has a length, and includes a power supply busbar group 910 and a conductive shielding layer group 920. The power supply busbar group 910 and the conductive shielding layer group 920 are both arranged along the length direction of the transmission line.

[0032] The power supply bus group 910 can be used to transmit alternating current. The power supply bus group 910 includes a first bus 710 and a second bus 720. The conductive shielding layer group 920 includes a conductive first shielding layer 730 and a conductive second shielding layer 740. The first shielding layer 730 is sleeved on the first bus 710, and the second shielding layer 740 is sleeved on the second bus 720. The switch module 300 is respectively connected to the first bus 710 and the second bus 720 to switch the on and off states of the transmission lines of the first bus 710 and the second bus 720. Specifically, the first bus 710 can be connected to the L phase of the AC power supply, and the second bus 720 can be connected to the N phase of the AC power supply.

[0033] The transmission line shielding detection circuit of the present invention, when the power supply bus group 910 has leakage, the power supply bus group 910 and the conductive shielding layer group 920 will be connected, thereby, the leakage detection module 100 detects and generates a leakage signal, and when the conductive shielding layer group 920 is broken or damaged, even if the power supply bus group 910 and the conductive shielding layer group 920 are connected, the current may not be able to be transmitted to the leakage detection module 100, and the fracture detection module 200 is connected to both ends of the conductive shielding layer group 920 to detect the fracture signal. When the control module 400 receives any one of the leakage signal and the fracture signal, it controls the switch module 300 to disconnect, thereby cutting off the transmission line and ensuring power supply safety. This design can respond in time whether there is leakage in the transmission line or the conductive shielding layer group 920 is broken or damaged, disconnecting the transmission line and improving the power supply safety performance.

[0034] In some embodiments of the present invention, in order to prevent the transmission voltage of the power supply busbar group 910 from being too high and causing damage to the power load at the rear end, such as Figure 1 、 2 As shown, it also includes an overvoltage detection module 500, which includes a sampling terminal group. The sampling terminal group of the overvoltage detection module 500 is connected to the power supply bus group 910 to detect an overvoltage signal. The overvoltage signal is used to indicate that the transmission voltage of the power supply bus group 910 is higher than the overvoltage voltage threshold. The output terminal of the overvoltage detection module 500 is connected to the control module 400. The control module 400 controls the switch module 300 to disconnect when receiving any one of the leakage signal, the fracture signal and the overvoltage signal. Specifically, the sampling terminal group includes a first sampling terminal and a second sampling terminal. The first sampling terminal of the overvoltage detection module 500 is connected to the first bus 710, and the second sampling terminal of the overvoltage detection module 500 is connected to the second bus 720.

[0035] In some embodiments of the present invention, the overvoltage detection module 500 includes a voltage divider unit 510 and a judgment unit 520. The input end of the voltage divider unit 510 is connected to the power supply bus group 910, and the output end of the voltage divider unit 510 is connected to the input end of the judgment unit 520. The judgment unit 520 is used to determine whether the transmission voltage is higher than the overvoltage threshold and form an overvoltage signal accordingly. The output end of the judgment unit 520 is connected to the control module 400.

[0036] The voltage divider unit 510 can reduce the transmission voltage of the power supply bus group 910 to facilitate the judgment unit 520 to make a judgment, and the judgment unit 520 is provided with an overvoltage threshold. When the transmission voltage is higher than the overvoltage threshold, the judgment unit 520 generates an overvoltage signal, triggering the control module 400 to control the switch module 300 to disconnect.

[0037] Specifically, the voltage divider unit 510 may include a resistor R6 and a resistor R8, one end of the resistor R6 is connected to the first bus 710, and one end of the resistor R8 is connected to the second bus 720. The judgment unit 520 may include a Zener diode D2, the negative pole of the Zener diode D2 is respectively connected to the other end of the resistor R6 and the other end of the resistor R8, and the positive pole of the Zener diode D2 is connected to the control module 400. When the voltage output by the voltage divider unit 510 is too high, the Zener diode D2 breaks down, thereby forming an overvoltage signal. Specifically, the overvoltage threshold can be set by the user by changing the parameters of the Zener diode D2 according to actual conditions.

[0038] In some embodiments of the present invention, Figure 1 、 2 As shown, the leakage detection module 100 includes a rectifier unit 110 and an isolation unit 120, one phase of the AC input end of the rectifier unit 110 is connected to the power supply bus group 910, the other phase of the AC input end of the rectifier unit 110 is connected to the conductive shielding layer group 920, the DC output end of the rectifier unit 110 is connected to the input end of the isolation unit 120, and the output end of the isolation unit 120 is connected to the control module 400.

[0039] The rectifier unit 110 can be selected from a conventional full-bridge rectifier or half-bridge rectifier structure. When there is no leakage in the power supply bus group 910, no loop is formed between the two phases of the AC input end of the rectifier unit 110 and the power supply bus group 910 and the conductive shielding layer group 920. Therefore, the output end of the rectifier unit 110 will not output voltage. When there is leakage in the power supply bus group 910, a loop is formed between the two phases of the AC input end of the rectifier unit 110 and the power supply bus group 910 and the conductive shielding layer group 920, and the output end of the rectifier unit 110 outputs voltage. The isolation unit 120 can isolate the signal to prevent interference with the broken signal and the overvoltage signal.

[0040] One phase of the AC input end of the rectifier unit 110 is connected to one end of the resistor R10 and one end of the resistor R11 respectively, the other end of the resistor R10 is connected to the first bus 710 , and the other end of the resistor R11 is connected to the second bus 720 .

[0041] In some embodiments of the present invention, Figure 2 As shown, it also includes a first step-down power supply module 610, the power supply end of the first step-down power supply module 610 is connected to the power supply bus group 910, the isolation unit 120 includes a photocoupler U2, the input end of the photoreceiver of the photocoupler U2 is connected to the output end of the first step-down power supply module 610, the output end of the photoreceiver of the photocoupler U2 is connected to the control module 400, the positive pole of the light emitter of the photocoupler U2 is connected to the positive pole of the DC output end of the rectifier unit 110, and the negative pole of the light emitter of the photocoupler U2 is connected to the negative pole of the DC output end of the rectifier unit 110.

[0042] Specifically, the first step-down power supply module 610 includes a resistor R3 and a resistor R4, one end of the resistor R3 is connected to the first bus 710, one end of the resistor R4 is connected to the first bus 710, and the other end of the resistor R3 is respectively connected to the other end of the resistor R4 and the positive pole of the light emitter of the optocoupler U2, and the negative pole of the light emitter of the optocoupler U2 is connected to the control module 400 and outputs a leakage signal.

[0043] In some embodiments of the present invention, Figure 2 As shown, it also includes a second step-down power supply module 620, the power supply end of the second step-down power supply module 620 is connected to the power supply bus group 910, and the output end of the second step-down power supply module 620 is connected to the conductive shielding layer group 920. The fracture detection module 200 includes a comparison unit, and the comparison unit includes a first detection end and a second detection end. The first detection end of the comparison unit is connected to one end of the conductive shielding layer group 920 and the second detection end of the comparison unit is connected to the other end of the conductive shielding layer group 920. The output end of the comparison unit is connected to the control module 400. When the voltages of the first detection end of the comparison unit and the second detection end of the comparison unit are different, a fracture signal is generated.

[0044] The second step-down power supply module 620 can provide low voltage for the conductive shielding layer group 920. It should be noted that the voltage threshold of the leakage detection module 100 can be set. The voltage transmitted by the power supply bus group 910 is relatively high. Therefore, when leakage occurs, it can be higher than the voltage threshold of the leakage detection module 100. When there is no leakage, although the conductive shielding layer group 920 is low voltage, it is lower than the voltage threshold of the leakage detection module 100, and the leakage detection module 100 will not generate a leakage signal.

[0045] When a break occurs at any point between the two ends of the conductive shielding layer group 920, since the first detection end and the second detection end of the comparison unit are respectively connected to the two ends of the conductive shielding layer group 920, there is a voltage difference between the end of the conductive shielding layer group 920 close to the output access point of the second step-down power supply module 620 and the end of the conductive shielding layer group 920 far away from the output access point of the second step-down power supply module 620, so the comparison unit can form a break signal.

[0046] In some embodiments of the present invention, the comparison unit includes a switch tube Q3, a resistor R12, a resistor R13, a resistor R14, a diode D4 and a diode D3, one end of the resistor R12 is connected to one end of the conductive shielding layer group 920, the other end of the resistor R12 is connected to the input electrode of the switch tube Q3, the controlled electrode of the switch tube Q3 is connected to one end of the resistor R13, the other end of the resistor R13 is respectively connected to one end of the resistor R14 and the other end of the conductive shielding layer group 920, the output electrode of the switch tube Q3 is connected to the positive electrode of the diode D4, the negative electrode of the diode D4 is connected to the control module 400, the other end of the resistor R14 is connected to the positive electrode of the diode D3, and the negative electrode of the diode D3 is connected to the power supply bus group 910.

[0047] The switch tube Q3 can be selected from transistors, MOS tubes and other components according to actual conditions. Specifically, Figure 2 As shown, the switch tube Q3 can be a PNP type transistor, the other end of the resistor R14 can be connected to the second bus 720 or the second bus 720, and the output end of the second step-down power supply module 620 is connected to a position close to one end of the conductive shielding layer group 920. When the conductive shielding layer group 920 is broken, the base side voltage of the switch tube Q3 is pulled down, and the switch tube Q3 is turned on to form a break signal.

[0048] Specifically, the second step-down power supply module 620 includes a resistor R5, one end of the resistor R5 is connected to the first bus 710 or the second bus 720, and the other end of the resistor R5 is respectively connected to the conductive shielding layer group 920 and the input pole of the switch tube Q3. It should be noted that the resistance value of the resistor R5 here is generally large, and the voltage level of the conductive shielding layer group 920 is not sufficient to trigger the leakage detection module 100 to generate a leakage signal.

[0049] Specifically, it also includes a control switch test. The other end of the resistor R5 is connected to the conductive shielding layer group 920 and the input pole of the switch tube Q3 through the control switch test. The user can decide whether to implement a fracture detection on the conductive shielding layer group 920 by changing the on-off state of the control switch test.

[0050] In some embodiments of the present invention, the switch module 300 includes a relay unit, the relay unit includes a relay switch 310 and a relay coil 320 capable of driving the relay switch 310 to be on and off, the relay switch 310 is connected to the power supply bus group 910 to switch the on and off state of the transmission line of the power supply bus group 910, the control module 400 includes a switch tube Q1, the relay coil 320 is connected to the switch tube Q1 to form at least part of a driving power supply circuit, the driving power supply circuit is connected to the power supply bus group 910, and the controlled pole of the switch tube Q1 is respectively connected to the output end of the leakage detection module 100 and the output end of the fracture detection module 200.

[0051] There can be two relay switches 310, which are connected to the first bus 710 and the second bus 720 one by one. The relay switch 310 can be in a normally closed state. When any one of the leakage signal, fracture signal or overvoltage signal occurs, the control module 400 can control the relay coil 320 to be energized, and the relay coil 320 can drive the relay switch 310 to disconnect.

[0052] Among them, the switch tube Q1 can be a transistor, a MOS tube or a thyristor. Specifically, one end of the driving power supply circuit is connected to the first bus 710, and the other end of the driving power supply circuit is connected to the second bus 720. The controlled pole of the switch tube Q1 is energized to make the switch tube Q1 turned on, the driving power supply circuit is turned on, and the relay coil 320 is energized to drive the relay switch 310 to be disconnected.

[0053] In some embodiments of the present invention, a light prompt module 630 is also included. The light prompt module 630 is connected in parallel with the switch tube Q1. When the transmission line transmits electric energy normally, the switch tube Q1 is in the disconnected state, and the light prompt module 630 lights up. When the transmission line leaks or the conductive shielding layer group 920 is broken, the switch tube Q1 is closed and turned on, and the light prompt module 630 is short-circuited and extinguished. The user can know the power transmission status of the transmission line according to the on and off status of the light prompt module 630. Specifically, the light prompt module 630 can be composed of an LED.

[0054] According to the second aspect of the embodiment of the present invention, the transmission line system includes a shielding detection circuit and a power supply bus group 910. A conductive shielding layer group 920 is provided on the power supply bus group 910. The switch module 300 is connected to the power supply bus group 910 to switch the on / off state of the transmission line of the power supply bus group 910. The control module 400 controls the switch module 300 to disconnect when receiving any one of the leakage signal and the fracture signal.

[0055] In the transmission line system of the present invention, the power supply bus group 910 realizes the transmission of electric energy. During the transmission process, when the power supply bus group 910 leaks, the power supply bus group 910 and the conductive shielding layer group 920 will be connected. As a result, the leakage detection module 100 detects and generates a leakage signal. When the conductive shielding layer group 920 is broken or damaged, even if the power supply bus group 910 and the conductive shielding layer group 920 are connected, the current may not be able to be transmitted to the leakage detection module 100. The fracture detection module 200 is connected to both ends of the conductive shielding layer group 920 to detect the fracture signal. When the control module 400 receives any one of the leakage signal and the fracture signal, it controls the switch module 300 to disconnect, thereby cutting off the transmission line and ensuring power supply safety. This design can respond in time whether there is leakage in the transmission line or the conductive shielding layer group 920 is broken or damaged, disconnecting the transmission line and improving power supply safety performance.

[0056] In some embodiments of the present invention, Figure 3 As shown, the power supply bus group 910 can be applied to the power supply transmission of the AC power supply. The power supply bus group 910 includes a first bus 710 and a second bus 720. The conductive shielding layer group 920 includes a conductive first shielding layer 730 and a conductive second shielding layer 740. The first shielding layer 730 is sleeved on the first bus 710, and the second shielding layer 740 is sleeved on the second bus 720. The switch module 300 is respectively connected to the first bus 710 and the second bus 720 to switch the on and off states of the transmission lines of the first bus 710 and the second bus 720. The detection end of the leakage detection module 100 is connected to the first shielding layer 730 or the second shielding layer 740. The first detection end of the fracture detection module 200 is connected to one end of the first shielding layer 730, the second detection end of the fracture detection module 200 is connected to one end of the second shielding layer 740, and the other end of the first shielding layer 730 is connected to the other end of the second shielding layer 740.

[0057] The first busbar 710 includes a first current-carrying core 711 and a first insulating layer 712 coated on the outer circumference of the first current-carrying core 711, the first shielding layer 730 coated on the outer circumference of the first insulating layer 712, the second busbar 720 includes a second current-carrying core 721 and a second insulating layer 722 coated on the outer circumference of the second current-carrying core 721, the second shielding layer 740 coated on the outer circumference of the second insulating layer 722, and the first shielding layer 730 and the second shielding layer 740 are conductively connected.

[0058] Among them, the first current-carrying core 711 can be connected to the L phase of the AC power supply, and the second current-carrying core 721 can be connected to the N phase of the AC power supply. The first shielding layer 730 can shield the power transmission of the first current-carrying core 711, and the second shielding layer 740 can shield the power transmission of the second current-carrying core 721. At the same time, when the power transmission of the first current-carrying core 711 leaks to the outside, the current will break through the first insulating layer 712 and then be transmitted to the shielding detection circuit through the first shielding layer 730. Similarly, when the power transmission of the second current-carrying core 721 leaks to the outside, the current will break through the second insulating layer 722 and then be transmitted to the shielding detection circuit through the second shielding layer 740.

[0059] The first current-carrying core 711 and the second current-carrying core 721 can both be formed by twisting conductive wires made of metals such as copper and aluminum or alloys.

[0060] In some embodiments of the present invention, the first insulating layer 712 and the second insulating layer 722 can both be made of plastic, rubber or irradiated EPDM material. Specifically, the plastic can be PVC material, the rubber can be CPE synthetic rubber material, and the irradiated EPDM material can be EPDM rubber. Compared with traditional irradiated chlorinated polyethylene insulation material, the irradiated EPDM material has better insulation and waterproof properties.

[0061] It should be noted that the transmission line also includes a sheath layer 750, which covers the first busbar 710 and the second busbar 720 inside. Fillers can also be provided between the first busbar 710 and the second busbar 720 and between the inside of the sheath layer 750 and the outer wall of the first busbar 710 or the outer wall of the second busbar 720. Specifically, the filler can be aramid.

[0062] The first shielding layer 730 and the second shielding layer 740 can both be made of composite conductive materials, specifically, Figure 4 As shown, the composite conductive material includes a non-woven fabric layer 810, at least one conductor 820 and a non-metallic conductive layer component 830. The conductor 820 is arranged on at least one surface of the non-woven fabric layer 810 and extends along the length direction of the non-woven fabric layer 810. The conductive layer component 830 covers at least one surface of the non-woven fabric layer 810 and the conductor 820 is located between the conductive layer component 830 and the non-woven fabric layer 810. The conductor 820 is conductively connected to the conductive layer component 830.

[0063] The non-woven fabric layer 810 is made of polyester fiber (PET for short) and is produced through a needle punching process, thus having better flexibility.

[0064] The conductor body 820 can be a copper wire or an aluminum alloy wire, and there can be multiple conductor bodies 820. Specifically, the non-woven fabric layer 810 is generally cut into strips, and the conductor body 820 is extended along the length direction of the non-woven fabric layer 810, and multiple conductor bodies 820 can be arranged at intervals along the width direction of the non-woven fabric layer 810. The control line connected to the shielding detection circuit can be easily connected to the end of the conductor body 820.

[0065] In some embodiments of the present invention, the conductive layer assembly 830 is composed of one of superconducting graphene, superconducting carbon nanomaterials, superconducting graphite, and superconducting carbon black.

[0066] Superconductive graphene, superconductive carbon nanomaterials, superconductive graphite, and superconductive carbon black are non-metallic superconductive materials with excellent conductive properties. The conductive layer assembly 830 covers the conductor body 820, thereby being in close contact with the conductor body 820 for conductivity. Specifically, during production, superconductive graphene, superconductive carbon nanomaterials, superconductive graphite, and superconductive carbon black are generally liquid slurries, which are soaked or coated on the surface of the non-woven fabric layer 810 and then solidified. The slurries of superconductive graphene, superconductive carbon nanomaterials, superconductive graphite, and superconductive carbon black have a certain flexibility after solidification. Combined with the support of the non-woven fabric, the conductive layer assembly 830 is not easy to break when bent.

[0067] The non-woven fabric layer 810 has good toughness, and the non-metallic conductive layer component 830 covers the non-woven fabric layer 810. When the composite conductive material is bent, the non-woven fabric layer 810 is not easily torn, and at the same time can provide good support for the conductive layer component 830, so that the conductive layer component 830 maintains good conductive performance, and the wire body 820 can also be in close contact with the conductive layer component 830. The electrical signal sensed by the conductive layer component 830 can be transmitted to the outside world through the wire body 820.

[0068] In some embodiments of the present invention, the conductive layer assembly 830 includes a first conductive layer 831 and a second conductive layer 832, the first conductive layer 831 covers the upper surface of the non-woven fabric layer 810, the second conductive layer 832 covers the lower surface of the non-woven fabric layer 810, the conductor body 820 is located between the second conductive layer 832 and the non-woven fabric layer 810, and the conductor body 820 is conductively connected to the second conductive layer 832.

[0069] Generally speaking, the conductor body 820 is arranged on one surface of the non-woven fabric layer 810, and the first conductive layer 831 is covered on the upper surface of the non-woven fabric layer 810, and the second conductive layer 832 is covered on the lower surface of the non-woven fabric layer 810, which can increase the overall strength of the composite conductive material. At the same time, since the composite conductive material can be used to form a shielding layer of the power line, the shielding ability of the shielding layer against electromagnetic interference signals can be improved, and the accuracy of leakage detection can also be improved.

[0070] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0071] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. A transmission line shielding detection circuit, characterized in that: Applied to a power supply busbar group, the power supply busbar group is provided with a conductive shielding layer group, characterized in that the shielding detection circuit includes: A leakage detection module, wherein a detection end of the leakage detection module is connected to the conductive shielding layer group to detect a leakage signal, wherein the leakage signal is used to indicate a leakage condition between the power supply bus group and the conductive shielding layer group; a fracture detection module, the fracture detection module comprising a first detection end and a second detection end, the first detection end of the fracture detection module being connected to one end of the conductive shielding layer group and the second detection end of the fracture detection module being connected to the other end of the conductive shielding layer group to detect a fracture signal, the fracture signal being used to indicate a fracture of the conductive shielding layer group; A switch module, connected to the power supply bus group to switch the transmission line of the power supply bus group on and off; a control module, the control module being respectively connected to the output end of the leakage detection module, the output end of the fracture detection module, and the controlled end of the switch module to control the switch module to be disconnected upon receiving either the leakage signal or the fracture signal; A second step-down power-taking module, wherein a power-taking end of the second step-down power-taking module is connected to the power supply busbar group, and an output end of the second step-down power-taking module is connected to the conductive shielding layer group; The fracture detection module includes a comparison unit, the comparison unit includes a first detection end and a second detection end, the first detection end of the comparison unit is connected to one end of the conductive shielding layer group, and the second detection end of the comparison unit is connected to the other end of the conductive shielding layer group, the output end of the comparison unit is connected to the control module, and the fracture signal is generated when the voltages of the first detection end and the second detection end of the comparison unit are different; The comparison unit includes a switch tube Q3, a resistor R12, a resistor R13, a resistor R14, a diode D4, and a diode D3. One end of the resistor R12 is connected to one end of the conductive shielding layer group, the other end of the resistor R12 is connected to the input electrode of the switch tube Q3, the controlled electrode of the switch tube Q3 is connected to one end of the resistor R13, the other end of the resistor R13 is respectively connected to one end of the resistor R14 and the other end of the conductive shielding layer group, the output electrode of the switch tube Q3 is connected to the positive electrode of the diode D4, the negative electrode of the diode D4 is connected to the control module, the other end of the resistor R14 is connected to the positive electrode of the diode D3, and the negative electrode of the diode D3 is connected to the power supply bus group; The second step-down power supply module includes a resistor R5 and a control switch test. One end of the resistor R5 is connected to the power supply bus group, and the other end of the resistor R5 is connected to the conductive shielding layer group and the input pole of the switch tube Q3 through the control switch test.

2. The transmission line shielding detection circuit according to claim 1, wherein: It also includes an overvoltage detection module, which includes a sampling end group. The sampling end group of the overvoltage detection module is connected to the power supply bus group to detect an overvoltage signal. The overvoltage signal is used to indicate that the transmission voltage of the power supply bus group is higher than the overvoltage threshold. The output end of the overvoltage detection module is connected to the control module. The control module controls the switch module to disconnect when receiving any one of the leakage signal, the fracture signal and the overvoltage signal.

3. The transmission line shielding detection circuit according to claim 2, wherein: The overvoltage detection module includes a voltage divider unit and a judgment unit. The input end of the voltage divider unit is connected to the power supply bus group, and the output end of the voltage divider unit is connected to the input end of the judgment unit. The judgment unit is used to determine whether the transmission voltage is higher than the overvoltage threshold and form the overvoltage signal accordingly. The output end of the judgment unit is connected to the control module.

4. The transmission line shielding detection circuit according to claim 1, wherein: The leakage detection module includes a rectifier unit and an isolation unit, one phase of the AC input end of the rectifier unit is connected to the power supply bus group, the other phase of the AC input end of the rectifier unit is connected to the conductive shielding layer group, the DC output end of the rectifier unit is connected to the input end of the isolation unit, and the output end of the isolation unit is connected to the control module.

5. The transmission line shielding detection circuit according to claim 4, characterized in that: It also includes a first step-down power supply module, the power supply end of the first step-down power supply module is connected to the power supply bus group, the isolation unit includes a photoelectric coupler U2, the input end of the photodetector of the photoelectric coupler U2 is connected to the output end of the first step-down power supply module, and the output end of the photodetector of the photoelectric coupler U2 is connected to the control module.

6. The transmission line shielding detection circuit according to claim 1, characterized in that: The switch module includes a relay unit, which includes a relay switch and a relay coil capable of driving the relay switch to be on and off. The relay switch is connected to the power supply bus group to switch the on and off state of the transmission line of the power supply bus group. The control module includes a switch tube Q1. The relay coil is connected to the switch tube Q1 to form at least part of a drive power supply circuit. The drive power supply circuit is connected to the power supply bus group. The controlled pole of the switch tube Q1 is respectively connected to the output end of the leakage detection module and the output end of the fracture detection module.

7. A transmission line system, characterized in that: It comprises the transmission line shielding detection circuit according to any one of claims 1 to 6 and a power supply busbar group, wherein a conductive shielding layer group is sleeved on the power supply busbar group; The shielding detection circuit comprises: A leakage detection module, wherein a detection end of the leakage detection module is connected to the conductive shielding layer group to detect a leakage signal, wherein the leakage signal is used to indicate a leakage condition between the power supply bus group and the conductive shielding layer group; a fracture detection module, the fracture detection module comprising a first detection end and a second detection end, the first detection end of the fracture detection module being connected to one end of the conductive shielding layer group and the second detection end of the fracture detection module being connected to the other end of the conductive shielding layer group to detect a fracture signal, the fracture signal being used to indicate a fracture of the conductive shielding layer group; A switch module, connected to the power supply bus group to switch the transmission line of the power supply bus group on and off; A control module is connected to the output end of the leakage detection module, the output end of the fracture detection module and the controlled end of the switch module respectively to control the switch module to disconnect when receiving any one of the leakage signal and the fracture signal.

8. The transmission line system according to claim 7, wherein: The power supply busbar group includes a first busbar and a second busbar, the conductive shielding layer group includes a conductive first shielding layer and a conductive second shielding layer, the first shielding layer is sleeved on the first busbar, and the second shielding layer is sleeved on the second busbar, the switch module is respectively connected to the first busbar and the second busbar to switch the on-off state of the transmission lines of the first busbar and the second busbar, the detection end of the leakage detection module is connected to the first shielding layer or the second shielding layer, the first detection end of the fracture detection module is connected to one end of the first shielding layer, the second detection end of the fracture detection module is connected to one end of the second shielding layer, and the other end of the first shielding layer is connected to the other end of the second shielding layer.

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