Shielding layer detection circuit and transmission system

Abstract

The application discloses a shielding layer detection circuit and a transmission system, which comprise a first resistance voltage division component, a second resistance voltage division component, a switch module and a control module. The first resistance voltage division component is connected with a conductive shielding layer group to detect a leakage signal. The first detection end of the second resistance voltage division component is connected with one end of the conductive shielding layer group, and the second detection end of the second resistance voltage division component is connected with the other end of the conductive shielding layer group to detect a fracture signal. The switch module is connected with a power bus group to switch the transmission line circuit on-off state of the power bus group. The control module is connected with the output end of the first resistance voltage division component, the output end of the second resistance voltage division component and the controlled end of the switch module to control the switch module to be disconnected when any one of the leakage signal and the fracture signal is received. The resistance element has high use durability and is not easy to be damaged by aging, so that the detection accuracy can be kept good at any time, and the maintenance cost is reduced without frequent maintenance in a short period.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cable equipment, in particular to a shielding layer detection circuit and a transmission system. BACKGROUND

[0002] In the existing power transmission line, generally includes a power bus and a conductive shielding layer sleeved on the power bus, the conductive shielding layer needs to be detected by the shielding layer detection circuit to determine whether the power bus and the conductive shielding layer are short-circuited and whether the conductive shielding layer is broken. The circuit structure of the leakage detection module and the breakage detection module of the shielding layer detection circuit has various implementation manners. Generally, a switching tube or a diode made of a semiconductor material is used as a sampling element. For example, different pins of the switching tube are connected to both ends of the conductive shielding layer. The voltage difference formed by the breakage of the conductive shielding layer drives the switching tube to conduct, thereby forming a breakage signal. According to the breakage signal, the conduction of the power bus is cut off in time. However, the switching tube or diode made of a semiconductor material will age and cause detection failure. The maintenance period is short, and human cost is consumed. SUMMARY

[0003] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the present application provides a shielding layer detection circuit and a transmission system, which improves the durability, detects accurately, and reduces the maintenance cost.

[0004] According to the shielding layer detection circuit of the first aspect of the present application, the shielding layer detection circuit is applied to a power bus group, a conductive shielding layer group is sleeved on the power bus group, and the shielding layer detection circuit comprises: a first resistance voltage dividing assembly connected with the conductive shielding layer group to detect a leakage signal, the leakage signal being used to represent that the power bus group and the conductive shielding layer group are short-circuited; a second resistance voltage dividing assembly comprising a first detection end and a second detection end, the first detection end of the second resistance voltage dividing assembly being connected with one end of the conductive shielding layer group and the second detection end of the second resistance voltage dividing assembly being connected with the other end of the conductive shielding layer group to detect a breakage signal, the breakage signal being used to represent that the conductive shielding layer group is broken; a switching module connected with the power bus group to switch the transmission line on-off state of the power bus group; and a control module connected with the output end of the first resistance voltage dividing assembly, the output end of the second resistance voltage dividing assembly and the controlled end of the switching module respectively to control the switching module to be disconnected when any one of the leakage signal and the breakage signal is received.

[0005] According to the shielding layer detection circuit of the present application, at least the following

[0006] Advantages:

[0007] The shielding layer detection circuit utilizes the first resistance voltage division component for voltage division processing to detect and form a leakage signal, and utilizes the second resistance voltage division component for voltage division processing to detect and form a rupture signal, and the control module controls the switch module to be disconnected when receiving any one of the leakage signal and the rupture signal, the resistance element has high use durability and is not easy to be damaged by aging, and thus good detection accuracy can be maintained at all times, frequent maintenance is not required in a short period, and maintenance cost is reduced.

[0008] According to some embodiments of the present application, the shielding layer detection circuit comprises a first resistance R5, a second resistance R6, a third resistance R7, a fourth resistance R8, and a switch tube Q2, the first resistance R5 and the fourth resistance R8 constitute at least part of the first resistance voltage division component, the first resistance R5, the second resistance R6, the third resistance R7, the fourth resistance R8, and the switch tube Q2 constitute at least part of the second resistance voltage division component, one end of the first resistance R5 is electrically connected to one phase of the power bus group and the input terminal of the switch tube Q2, respectively, the other end of the first resistance R5 is electrically connected to one end of the second resistance R6, one end of the third resistance R7, and one end of the conductive shielding layer group, respectively, the other end of the second resistance R6 is electrically connected to the control terminal of the switch tube Q2, the other end of the third resistance R7 is electrically connected to the output terminal of the switch tube Q2, the other end of the conductive shielding layer group, one end of the fourth resistance R8, and the control module, respectively, and the other end of the fourth resistance R8 is electrically connected to the other phase of the power bus group.

[0009] According to some embodiments of the present application, the shielding layer detection circuit further comprises a unidirectional conduction element, the conduction end of the unidirectional conduction element is electrically connected to the other end of the fourth resistance R8, and the cutoff end of the unidirectional conduction element is electrically connected to the other phase of the power bus group, the unidirectional conduction element allows current to flow from the conduction end to the cutoff end and prevents current from flowing from the cutoff end to the conduction end.

[0010] According to some embodiments of the present application, the shielding layer detection circuit further comprises a test switch, the test switch is connected in parallel with the first resistance R5, and driving the test switch can make the test switch switch between the on and off states.

[0011] According to some embodiments of the present application, the first resistance voltage division component comprises a first resistance R5 and a fourth resistance R8, one end of the first resistance R5 is electrically connected to one phase of the power bus group, the other end of the first resistance R5 is electrically connected to one end of the fourth resistance R8, the control module, and the conductive shielding layer group, respectively, and the other end of the fourth resistance R8 is electrically connected to the other phase of the power bus group.

[0012] According to some embodiments of the present application, the second resistance voltage division assembly comprises a first resistance R5, a second resistance R6, a third resistance R7, a fourth resistance R8 and a switch Q2, one end of the first resistance R5 is electrically connected with an input terminal of the switch Q2 and one phase of the power bus group respectively, the other end of the first resistance R5 is electrically connected with one end of the second resistance R6, one end of the third resistance R7 and one end of the conductive shielding layer group respectively, the other end of the second resistance R6 is electrically connected with a control terminal of the switch Q2, the other end of the third resistance R7 is electrically connected with an output terminal of the switch Q2, the other end of the conductive shielding layer group, one end of the fourth resistance R8 and the control module respectively, and the other end of the fourth resistance R8 is electrically connected with another phase of the power bus group.

[0013] According to some embodiments of the present application, the switch module comprises a relay unit, the relay unit comprises a relay switch and a relay coil capable of driving the relay switch to be on or off, the relay switch is connected with the power bus group to switch the transmission line of the power bus group on or off, the control module comprises a switch Q1, the relay coil is connected with the switch Q1 to form at least part of a driving power supply circuit, the driving power supply circuit is connected with the power bus group, and the control terminal of the switch Q1 is connected with the output terminal of the first resistance voltage division assembly and the output terminal of the second resistance voltage division assembly respectively.

[0014] According to some embodiments of the present application, the shielding layer detection circuit further comprises a prompt light group, and the prompt light group is electrically connected with the power bus group.

[0015] According to some embodiments of the present application, a transmission system comprises a shielding layer detection circuit and a power bus group, and the power bus group is sleeved with a conductive shielding layer group; the shielding layer detection circuit comprises: a first resistance voltage division assembly connected with the conductive shielding layer group to detect a leakage signal, the leakage signal is used to represent that a short circuit occurs between the power bus group and the conductive shielding layer group; a second resistance voltage division assembly comprising a first detection terminal and a second detection terminal, the first detection terminal of the second resistance voltage division assembly is connected with one end of the conductive shielding layer group, and the second detection terminal of the second resistance voltage division assembly is connected with the other end of the conductive shielding layer group to detect a fracture signal, the fracture signal is used to represent that the conductive shielding layer group is fractured; a switch module connected with the power bus group to switch the transmission line of the power bus group on or off; and a control module connected with the output terminal of the first resistance voltage division assembly, the output terminal of the second resistance voltage division assembly and the control terminal of the switch module respectively to control the switch module to be off when any one of the leakage signal and the fracture signal is received.

[0016] According to the transmission system of the embodiment of the present application, at least the following beneficial effects are achieved:

[0017] The transmission system of the present application utilizes the power supply bus group to transmit electric energy, and the conductive shielding layer group is used to detect the transmission safety state of the power supply bus group. When the conductive shielding layer group itself is broken, a broken signal can be detected and formed by using the second resistance voltage dividing assembly for voltage dividing processing. When the power supply bus group is faulty and a short circuit occurs between the power supply bus group and the conductive shielding layer group, an electric leakage signal can be detected and formed by using the first resistance voltage dividing assembly for voltage dividing processing. The control module controls the switch module to be disconnected when receiving any one of the electric leakage signal and the broken signal. The resistance element has high durability and is not easy to be damaged by aging, so that good detection accuracy can be maintained at all times, and frequent maintenance is not required in a short period of time, thereby reducing the maintenance cost.

[0018] According to some embodiments of the present application, the power supply bus group comprises a first bus and a second bus, the conductive shielding layer group comprises a conductive first shielding layer and a conductive second shielding layer, the first shielding layer is sleeved on the first bus, the second shielding layer is sleeved on the second bus, the switch module is connected with the first bus and the second bus respectively to switch the transmission line on-off state of the first bus and the second bus, the first resistance voltage dividing assembly is connected with the first shielding layer or the second shielding layer, the first detection end of the second resistance voltage dividing assembly is connected with one end of the first shielding layer, the second detection end of the second resistance voltage dividing assembly is connected with one end of the second shielding layer, and the other end of the first shielding layer is connected with the other end of the second shielding layer.

[0019] Additional aspects and advantages of the present application will be made apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0020] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the following description, taken in conjunction with the accompanying drawings, in which:

[0021] Figure 1 It is a principle structure block diagram of one embodiment of the shielding layer detection circuit of the present application;

[0022] Figure 2 It is a circuit schematic diagram of one embodiment of the shielding layer detection circuit of the present application;

[0023] Figure 3 It is a transmission line cross section structure schematic diagram;

[0024] Figure 4 It is a structure schematic diagram of the first shielding layer.

[0025] Conductive shielding layer group

[0026] First resistance voltage dividing component 100; second resistance voltage dividing component 200; switch module 300; relay switch 310; relay coil 320; control module 400; prompt lamp group 500; one-way conducting piece 610; test switch 620; 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; wire body 820; conductive layer group 830; first conductive layer 831; second conductive layer 832; power supply busbar group 910; conductive shielding layer group 920. DETAILED DESCRIPTION

[0027] Embodiments of the present application are described below in detail, examples of which are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary, only for explaining the present application, and cannot be understood as limiting the present application.

[0028] In the description of the present application, it is understood that, in relation to the orientation description, for example, the orientation or position relationship indicated by the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or position relationship shown in the drawings, only for the convenience of describing the present application and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0029] In the description of the present application, the meaning of several is one or more, the meaning of multiple is two or more, greater than, less than, more than, etc. are understood as not including the number, above, below, within, etc. are understood as including the number. If it is described that the first, the second is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or the order of technical features indicated.

[0030] In the description of the present application, it is noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0031] As shown in Figures 1-4 A shielding layer detection circuit according to an embodiment of the first aspect of the present application is applied to a power bus group 910, a conductive shielding layer group 920 is sleeved on the power bus group 910, and the shielding layer detection circuit comprises a first resistance voltage dividing assembly 100, a second resistance voltage dividing assembly 200, a switch module 300, and a control module 400. The first resistance voltage dividing assembly 100 is connected with the conductive shielding layer group 920 to detect a leakage signal, the leakage signal is used to represent that a short circuit occurs between the power bus group 910 and the conductive shielding layer group 920. The second resistance voltage dividing assembly 200 comprises a first detection end and a second detection end, the first detection end of the second resistance voltage dividing assembly 200 is connected with one end of the conductive shielding layer group 920, and the second detection end of the second resistance voltage dividing assembly 200 is connected with the other end of the conductive shielding layer group 920 to detect a fracture signal, the fracture signal is used to represent that the conductive shielding layer group 920 is fractured. The switch module 300 is connected with the power bus group 910 to switch the transmission line on-off state of the power bus group 910. The control module 400 is connected with the output end of the first resistance voltage dividing assembly 100, the output end of the second resistance voltage dividing assembly 200, and the controlled end of the switch module 300 respectively to control the switch module 300 to be disconnected when any one of the leakage signal and the fracture signal is received.

[0032] It should be noted that, as shown in Figure 2 , 3 The transmission line has a length, and the power bus group 910 and the conductive shielding layer group 920 are included in the transmission line, and the power bus group 910 and the conductive shielding layer group 920 are arranged along the length direction of the transmission line.

[0033] The power bus group 910 can be used to transmit alternating current, and the power bus group 910 generally comprises a first bus 710 and a second bus 720. The conductive shielding layer group 920 comprises a conductive first shielding layer 730 and a conductive second shielding layer 740, and the first shielding layer 730 and the second shielding layer 740 can both be in a tubular shape. 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.

[0034] The switch module 300 is connected with the first bus 710 and the second bus 720 respectively to switch the transmission line on-off state of the first bus 710 and the second bus 720. Specifically, the first bus 710 can be connected to the L phase of an alternating current power supply, and the second bus 720 can be connected to the N phase of the alternating current power supply.

[0035] It should be noted that the switch module 300 can be a self-locking switch, which can be driven to be disconnected when any one of the leakage signal and the fracture signal is received, and the disconnected state is maintained without external force.

[0036] The shielding layer detection circuit utilizes the first resistance voltage division component 100 to detect and form a leakage signal through voltage division processing, and utilizes the second resistance voltage division component 200 to detect and form a rupture signal through voltage division processing, and the control module 400 controls the switch module 300 to be disconnected when receiving any one of the leakage signal and the rupture signal, the resistance element has high durability in use and is not easy to be damaged by aging, and therefore good detection accuracy can be maintained at all times, frequent maintenance is not required in a short period of time, and maintenance cost is reduced.

[0037] In some embodiments of the present application, the first resistance voltage division component 100 can include a first resistance R5 and a fourth resistance R8, one end of the first resistance R5 is electrically connected to one of the power bus groups 910, the other end of the first resistance R5 is electrically connected to one end of the fourth resistance R8, the control module 400 and the conductive shielding layer group 920 respectively, and the other end of the fourth resistance R8 is electrically connected to the other of the power bus groups 910.

[0038] It should be noted that the first resistance R5 has a large resistance value, one end of the first resistance R5 is connected to the first bus 710, and the other end of the fourth resistance R8 is connected to the second bus 720, in a normal state, no short circuit occurs between the first bus 710 and the first shielding layer 730 or between the second bus 720 and the second shielding layer 740, and the voltage at the connection point of the first resistance R5 and the fourth resistance R8 is low and is not enough to trigger the formation of a leakage signal, when a short circuit occurs between the first bus 710 and the first shielding layer 730 or between the second bus 720 and the second shielding layer 740, the voltage of the conductive shielding layer group 920 is raised, causing the voltage at the connection point of the first resistance R5 and the fourth resistance R8 to be pulled up, triggering the formation of a leakage signal, and the control module 400 receives the leakage signal and controls the switch module 300 to be disconnected, thereby ensuring the safety of power transmission of the power bus groups 910.

[0039] In some embodiments of the present application, the second resistance voltage division component 200 includes a first resistance R5, a second resistance R6, a third resistance R7, a fourth resistance R8 and a switch tube Q2, one end of the first resistance R5 is electrically connected to one of the power bus groups 910 and the input terminal of the switch tube Q2 respectively, the other end of the first resistance R5 is electrically connected to one end of the second resistance R6, one end of the third resistance R7 and one end of the conductive shielding layer group 920 respectively, the other end of the second resistance R6 is electrically connected to the controlled terminal of the switch tube Q2, the other end of the third resistance R7 is electrically connected to the output terminal of the switch tube Q2, the other end of the conductive shielding layer group 920, one end of the fourth resistance R8 and the control module 400 respectively, and the other end of the fourth resistance R8 is electrically connected to the other of the power bus groups 910.

[0040] It should be noted that the resistance of the first resistor R5 is relatively large, one end of the first resistor R5 is connected with the first bus 710, the other end of the fourth resistor R8 is connected with the second bus 720, in the normal state, the conductive shielding layer group 920 is not broken, one end of the third resistor R7 and one end of the conductive shielding layer group 920 are electrically connected, the other end of the third resistor R7 and the other end of the conductive shielding layer group 920 are electrically connected, the potentials at the two ends of the third resistor R7 are basically the same, the switch tube Q2 keeps off state, when any one of the first shielding layer 730 or the second shielding layer 740 is broken, a voltage difference appears between the two ends of the third resistor R7, the voltage of the control electrode of the switch tube Q2 is pulled up, the switch tube Q2 is turned on, the voltage of one end of the fourth resistor R8 is pulled up, a broken signal is triggered, and the control module 400 controls the switch module 300 to be disconnected after receiving the broken signal, so as to ensure the safety of power transmission of the power bus group 910.

[0041] Specifically, in some embodiments of the present application, the first resistance voltage dividing assembly 100 and the second resistance voltage dividing assembly 200 can share resistance elements, for example, as shown in Figure 2 The shielding layer detection circuit includes a first resistor R5, a second resistor R6, a third resistor R7, a fourth resistor R8 and a switch tube Q2, the first resistor R5 and the fourth resistor R8 constitute at least part of the first resistance voltage dividing assembly 100, the first resistor R5, the second resistor R6, the third resistor R7, the fourth resistor R8 and the switch tube Q2 constitute at least part of the second resistance voltage dividing assembly 200, one end of the first resistor R5 is electrically connected with the input electrode of the switch tube Q2 and one of the power bus group 910 respectively, the other end of the first resistor R5 is electrically connected with one end of the second resistor R6, one end of the third resistor R7 and one end of the conductive shielding layer group 920 respectively, the other end of the second resistor R6 is electrically connected with the control electrode of the switch tube Q2, the other end of the third resistor R7 is electrically connected with the output electrode of the switch tube Q2, the other end of the conductive shielding layer group 920, one end of the fourth resistor R8 and the control module 400 respectively, and the other end of the fourth resistor R8 is electrically connected with the other phase of the power bus group 910.

[0042] In the normal state, no short circuit occurs between the first bus 710 and the first shielding layer 730 or between the second bus 720 and the second shielding layer 740, the voltage at the connection point of the third resistor R7 and the fourth resistor R8 is relatively low, which is not enough to trigger a leakage signal, when a short circuit occurs between the first bus 710 and the first shielding layer 730 or between the second bus 720 and the second shielding layer 740, the voltage of the conductive shielding layer group 920 rises, resulting in that the voltage at the connection point of the third resistor R7 and the fourth resistor R8 is pulled up, triggering a leakage signal, and the control module 400 controls the switch module 300 to be disconnected after receiving the leakage signal.

[0043] Similarly, in a normal state, the conductive shielding layer group 920 is not broken, one end of the third resistor R7 and one end of the conductive shielding layer group 920 are electrically connected, the other end of the third resistor R7 and the other end of the conductive shielding layer group 920 are electrically connected, the potentials at the two ends of the third resistor R7 are substantially the same, and the switch tube Q2 remains in an off state. When any one of the first shielding layer 730 or the second shielding layer 740 is broken, a voltage difference appears at the two ends of the third resistor R7, the voltage at the control electrode of the switch tube Q2 is pulled high, the switch tube Q2 is turned on, and the voltage at one end of the fourth resistor R8 is pulled high, thereby triggering a breakage signal. After the control module 400 receives the breakage signal, the control module 400 controls the switch module 300 to be turned off, thereby ensuring the safety of power transmission of the power bus group 910. Specifically, the switch tube Q2 can be a triode, a MOS tube, or a thyristor.

[0044] In some embodiments of the present application, the shielding layer detection circuit further comprises a unidirectional conduction element 610, the conduction end of the unidirectional conduction element 610 is electrically connected to the other end of the fourth resistor R8, and the cutoff end of the unidirectional conduction element 610 is electrically connected to the other phase of the power bus group 910. The unidirectional conduction element 610 allows current to flow from the conduction end to the cutoff end but prevents current from flowing from the cutoff end to the conduction end. Specifically, the unidirectional conduction element 610 can be a diode D1 or a unidirectional current limiting chip.

[0045] It should be noted that the first bus 710 and the second bus 720 transmit alternating current, for example, the first bus 710 can be connected to a live wire, and the second bus 720 can be connected to a zero line, or the first bus 710 is connected to one phase of a three-phase power supply, and the second bus 720 is connected to another phase of the three-phase power supply. The unidirectional conduction element 610 can limit the current of the second bus 720 from flowing back from the fourth resistor R8, so that the shielding layer detection circuit operates reasonably and orderly, and the detection is more stable and accurate.

[0046] In some embodiments of the present application, the shielding layer detection circuit further comprises a test switch 620, which is connected in parallel with the first resistor R5. Driving the test switch 620 can switch the test switch 620 between on and off states. Specifically, the test switch 620 can be a press switch, a magnetic drive switch, a self-resetting normally open switch, a self-locking switch, etc.

[0047] When the user needs to turn off the switch module 300 in time, the test switch 620 can be closed and turned on. At this time, the first resistor R5 is short-circuited, the voltage at one end of the third resistor R7 is pulled high, and the switch tube Q2 is turned on, thereby triggering the control module 400 to control the switch module 300 to be turned off.

[0048] In some embodiments of the present application, as shown in FIG. 6, the shielding layer detection circuit further comprises a test switch 620, which is connected in parallel with the first resistor R5. Driving the test switch 620 can switch the test switch 620 between on and off states. Specifically, the test switch 620 can be a press switch, a magnetic drive switch, a self-resetting normally open switch, a self-locking switch, etc. Figure 2As shown, 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 on and off, the relay switch 310 is connected with the power bus group 910 to switch the transmission line of the power bus group 910 on and off, the control module 400 includes a switch tube Q1, the relay coil 320 is connected with the switch tube Q1 to form at least part of a drive power supply circuit, the drive power supply circuit is connected with the power bus group 910, and the controlled electrode of the switch tube Q1 is connected with the output end of the first resistor voltage dividing assembly 100 and the output end of the second resistor voltage dividing assembly 200 respectively.

[0049] Wherein, the relay switch 310 can be two, one-to-one corresponding to the first bus 710 and the second bus 720, the relay switch 310 can be in a normally closed state, when any one of the leakage signal, the fracture signal or the overvoltage signal appears, the control module 400 can control the relay coil 320 to be powered, and the relay coil 320 can drive the relay switch 310 to be disconnected.

[0050] Wherein, the switch tube Q1 can be a triode, a MOS tube or a thyristor, specifically, one end of the drive power supply circuit is connected with the first bus 710, the other end of the drive power supply circuit is connected with the second bus 720, the controlled electrode of the switch tube Q1 is powered to make the switch tube Q1 conduct, the drive power supply circuit is turned on, and the relay coil 320 is powered to drive the relay switch 310 to be disconnected.

[0051] In some embodiments of the present application, the shielding layer detection circuit further includes a prompt lamp group 500, the prompt lamp group 500 is electrically connected with the power bus group 910, and the prompt lamp group 500 can include an LED lamp bead LED1.

[0052] Specifically, the prompt lamp group 500 can be connected in parallel with the switch tube Q1, when the transmission line normally transmits electric energy, the switch tube Q1 is in a disconnected state, and the prompt lamp group 500 is lit, and when the transmission line leaks or the conductive shielding layer group 920 appears fracture, the switch tube Q1 is closed and turned on, the prompt lamp group 500 is short-circuited and extinguished, and the user can know the power transmission condition of the transmission line according to the bright and dark state of the prompt lamp group 500.

[0053] According to the second aspect of the present application, a transmission system is provided. Figures 1-4As shown, the shielding layer detection circuit and the power bus group 910 are provided, and the power bus group 910 is sleeved with the conductive shielding layer group 920; the shielding layer detection circuit comprises a first resistance voltage dividing assembly 100, a second resistance voltage dividing assembly 200, a switch module 300 and a control module 400, the first resistance voltage dividing assembly 100 is connected with the conductive shielding layer group 920 to detect a leakage signal, the leakage signal is used to represent that a short circuit occurs between the power bus group 910 and the conductive shielding layer group 920, the second resistance voltage dividing assembly 200 comprises a first detection end and a second detection end, the first detection end of the second resistance voltage dividing assembly 200 is connected with one end of the conductive shielding layer group 920, and the second detection end of the second resistance voltage dividing assembly 200 is connected with the other end of the conductive shielding layer group 920 to detect a fracture signal, the fracture signal is used to represent that the conductive shielding layer group 920 is fractured, the switch module 300 is connected with the power bus group 910 to switch the transmission line on-off state of the power bus group 910, and the control module 400 is connected with the output end of the first resistance voltage dividing assembly 100, the output end of the second resistance voltage dividing assembly 200 and the controlled end of the switch module 300 respectively to control the switch module 300 to be disconnected when any one of the leakage signal and the fracture signal is received.

[0054] The transmission system of the present application utilizes the power bus group 910 to transmit electric energy, and the conductive shielding layer group 920 is used to detect the power transmission safety state of the power bus group 910, when the conductive shielding layer group 920 itself is fractured, the fracture signal can be detected and formed by the second resistance voltage dividing assembly 200, when the power bus group 910 fails, a short circuit occurs between the power bus group 910 and the conductive shielding layer group 920, the leakage signal can be detected and formed by the first resistance voltage dividing assembly 100, the control module 400 controls the switch module 300 to be disconnected when any one of the leakage signal and the fracture signal is received, the resistance element has high use durability and is not easy to be damaged by aging, so that good detection accuracy can be maintained at all times, frequent maintenance is not needed in a short period, and the maintenance cost is reduced.

[0055] In some embodiments of the present application, 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, the second shielding layer 740 is sleeved on the second bus 720, the switch module 300 is connected with the first bus 710 and the second bus 720 respectively to switch the transmission line on-off state of the first bus 710 and the second bus 720, the first resistance voltage dividing assembly 100 is connected with the first shielding layer 730 or the second shielding layer 740, the first detection end of the second resistance voltage dividing assembly 200 is connected with one end of the first shielding layer 730, the second detection end of the second resistance voltage dividing assembly 200 is connected with one end of the second shielding layer 740, and the other end of the first shielding layer 730 is connected with the other end of the second shielding layer 740.

[0056] The first bus 710 includes a first current-carrying core 711 and a first insulating layer 712 wrapped on the outer circumferential surface of the first current-carrying core 711, the first shielding layer 730 is wrapped on the outer circumferential surface of the first insulating layer 712, the second bus 720 includes a second current-carrying core 721 and a second insulating layer 722 wrapped on the outer circumferential surface of the second current-carrying core 721, and the second shielding layer 740 is wrapped on the outer circumferential surface of the second insulating layer 722, and the first shielding layer 730 and the second shielding layer 740 are conductively connected.

[0057] The first current-carrying core 711 can be connected with the L phase of the alternating current power supply, the second current-carrying core 721 can be connected with the N phase of the alternating current power supply, the first shielding layer 730 can shield the power transmission of the first current-carrying core 711, the second shielding layer 740 can shield the power transmission of the second current-carrying core 721, and when the power transmission of the first current-carrying core 711 leaks to the outside, the current will pass through the first shielding layer 730 to the shielding detection circuit after breaking through the first insulating layer 712, and similarly, when the power transmission of the second current-carrying core 721 leaks to the outside, the current will pass through the second shielding layer 740 to the shielding detection circuit after breaking through the second insulating layer 722.

[0058] The first current-carrying core 711 and the second current-carrying core 721 can be twisted by conductive wires made of metals or alloys such as copper and aluminum.

[0059] In some embodiments of the present application, the first insulating layer 712 and the second insulating layer 722 can be made of plastic, rubber or irradiated ethylene-propylene material. Specifically, the plastic can be made of PVC material, the rubber can be made of CPE synthetic rubber material, and the irradiated ethylene-propylene material can be made of ternary ethylene-propylene rubber. Compared with the traditional irradiated chlorinated polyethylene insulating material, the irradiated ethylene-propylene material has better insulating performance and waterproof performance.

[0060] It should be noted that the transmission line also includes a sheath layer 750, which covers the first bus bar 710 and the second bus bar 720 inside, and a filler can be arranged between the first bus bar 710 and the second bus bar 720 and the inner wall of the sheath layer 750 or the outer wall of the first bus bar 710 or the second bus bar 720. Specifically, the filler can be aramid.

[0061] The first shielding layer 730 and the second shielding layer 740 can be composed of a composite conductive material. Specifically, as shown in Figure 4 The composite conductive material includes a non-woven fabric layer 810, at least one wire body 820, and a non-metallic conductive layer assembly 830. The wire body 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 assembly 830 covers at least one surface of the non-woven fabric layer 810, and the wire body 820 is located between the conductive layer assembly 830 and the non-woven fabric layer 810. The wire body 820 is in conductive connection with the conductive layer assembly 830.

[0062] The non-woven fabric layer 810 is made of polyester fiber and terylene fiber (abbreviation: PET) material and is made by needling process, which has good flexibility.

[0063] The wire body 820 can be a copper wire or an aluminum alloy wire. There can be multiple wire bodies 820. Specifically, the non-woven fabric layer 810 is generally cut into a strip shape, and the wire body 820 extends along the length direction of the non-woven fabric layer 810. The multiple wire bodies 820 can be arranged in 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 wire body 820.

[0064] In some embodiments of the present application, the conductive layer assembly 830 is composed of one of superconductive graphene, superconductive carbon nanometer, superconductive graphite, and superconductive carbon black.

[0065] The superconductive graphene, superconductive carbon nanometer, superconductive graphite, and superconductive carbon black are non-metallic superconducting materials with good conductivity. The conductive layer assembly 830 covers the wire body 820 and is in close contact with the wire body 820 for conduction. Specifically, in production, the superconductive graphene, superconductive carbon nanometer, superconductive graphite, and superconductive carbon black are generally in the form of liquid slurry, which is soaked or coated on the surface of the non-woven fabric layer 810 and then solidified. The slurry of the superconductive graphene, superconductive carbon nanometer, superconductive graphite, and superconductive carbon black has a certain flexibility after solidification, which cooperates with the support of the non-woven fabric to make the conductive layer assembly 830 not easy to break when bending.

[0066] The non-woven fabric layer 810 has good toughness, the non-metal conductive layer assembly 830 is covered on the non-woven fabric layer 810, when the composite conductive material is bent, the non-woven fabric layer 810 is not easy to be torn, and meanwhile, the non-woven fabric layer 810 can give good support to the conductive layer assembly 830, so that the conductive layer assembly 830 keeps good conductive performance, and the wire body 820 can be in close contact with the conductive layer assembly 830, and the electric signal sensed by the conductive layer assembly 830 can be transmitted to the outside through the wire body 820.

[0067] In some embodiments of the present application, the conductive layer assembly 830 comprises a first conductive layer 831 and a second conductive layer 832, the first conductive layer 831 is covered on the upper surface of the non-woven fabric layer 810, the second conductive layer 832 is covered on the lower surface of the non-woven fabric layer 810, and the wire body 820 is located between the second conductive layer 832 and the non-woven fabric layer 810 and is in conductive connection with the second conductive layer 832.

[0068] Generally, the wire body 820 is arranged on one surface of the non-woven fabric layer 810, 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, so that the strength of the composite conductive material as a whole can be increased, meanwhile, since the composite conductive material can be applied to form a shielding layer of a power line, the shielding ability of the shielding layer to electromagnetic interference signals can be improved, and the accuracy of the electric leakage detection can also be improved.

[0069] The technical features of the above-described embodiments can be combined in any manner, and for the sake of brevity, not all possible combinations of the technical features in the above-described embodiments are described, however, as long as the combinations of the technical features do not exist contradictions, they should be considered as the scope of the present application.

[0070] Although the embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and the scope of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A shielding layer detection circuit applied to a power bus group, a conductive shielding layer group being sleeved on the power bus group, characterized in that, The shielding layer detection circuit comprises: a first resistance voltage division component connected with the conductive shielding layer group to detect a leakage signal, the leakage signal being used to represent that a short circuit occurs between the power bus group and the conductive shielding layer group; a second resistance voltage division component comprising a first detection end and a second detection end, the first detection end of the second resistance voltage division component being connected with one end of the conductive shielding layer group and the second detection end of the second resistance voltage division component being connected with the other end of the conductive shielding layer group to detect a fracture signal, the fracture signal being used to represent that the conductive shielding layer group is fractured; a switch module connected with the power bus group to switch the transmission line on-off state of the power bus group; a control module connected with the output end of the first resistance voltage division component, the output end of the second resistance voltage division component and the controlled end of the switch module respectively to control the switch module to be disconnected when any one of the leakage signal and the fracture signal is received. The second resistance voltage division component comprises a first resistance R5, a second resistance R6, a third resistance R7, a fourth resistance R8 and a switch tube Q2, the first resistance R5 and the fourth resistance R8 constituting at least part of the first resistance voltage division component, one end of the first resistance R5 being electrically connected with the input pole of the switch tube Q2 and one phase of the power bus group respectively, the other end of the first resistance R5 being electrically connected with one end of the second resistance R6, one end of the third resistance R7 and one end of the conductive shielding layer group respectively, the other end of the second resistance R6 being electrically connected with the controlled pole of the switch tube Q2, the other end of the third resistance R7 being electrically connected with the output pole of the switch tube Q2, the other end of the conductive shielding layer group, one end of the fourth resistance R8 and the control module respectively, the other end of the fourth resistance R8 being electrically connected with the other phase of the power bus group. Further comprising a unidirectional conduction component, the conduction end of the unidirectional conduction component being electrically connected with the other end of the fourth resistance R8, the cutoff end of the unidirectional conduction component being electrically connected with the other phase of the power bus group, the unidirectional conduction component allowing current to flow from the conduction end to the cutoff end and preventing current from flowing from the cutoff end to the conduction end.

2. The shield layer detection circuit according to claim 1, characterized in that, Further comprising a test switch, the test switch being connected with the first resistance R5 in parallel, driving the test switch being capable of switching the on-off state of the test switch.

3. The shield layer detection circuit according to claim 1, characterized by The first resistance voltage division component comprises a first resistance R5 and a fourth resistance R8, one end of the first resistance R5 being electrically connected with one phase of the power bus group, the other end of the first resistance R5 being electrically connected with one end of the fourth resistance R8, the control module and the conductive shielding layer group respectively, the other end of the fourth resistance R8 being electrically connected with the other phase of the power bus group.

4. The shield detection circuit of claim 1, wherein The switch module comprises a relay unit, the relay unit comprises a relay switch and a relay coil capable of driving the relay switch to be on or off, the relay switch is connected with the power bus group to switch the transmission line on or off of the power bus group, the control module comprises a switch tube Q1, the relay coil is connected with the switch tube Q1 to form at least part of the driving power supply circuit, the driving power supply circuit is connected with the power bus group, and the controlled electrode of the switch tube Q1 is connected with the output end of the first resistance voltage dividing assembly and the output end of the second resistance voltage dividing assembly respectively.

5. The shield detection circuit of claim 1, wherein The prompt lamp group is further included, and the prompt lamp group is electrically connected with the power bus group.

6. A transmission system, characterized in that The shielding layer detection circuit comprises: The first resistance voltage dividing assembly is connected with the conductive shielding layer group to detect a leakage signal, and the leakage signal is used to represent that the short circuit occurs between the power bus group and the conductive shielding layer group; The second resistance voltage dividing assembly comprises a first detection end and a second detection end, the first detection end of the second resistance voltage dividing assembly is connected with one end of the conductive shielding layer group, and the second detection end of the second resistance voltage dividing assembly is connected with the other end of the conductive shielding layer group to detect a fracture signal, and the fracture signal is used to represent that the fracture occurs in the conductive shielding layer group; The switch module is connected with the power bus group to switch the transmission line on or off of the power bus group; The control module is connected with the output end of the first resistance voltage dividing assembly, the output end of the second resistance voltage dividing assembly and the controlled end of the switch module respectively to control the switch module to be disconnected when any one of the leakage signal and the fracture signal is received.

7. A transmission system as claimed in claim 6, characterised in that The power bus group comprises a first bus and a second bus, the conductive shielding layer group comprises a conductive first shielding layer and a conductive second shielding layer, the first shielding layer is sleeved on the first bus, the second shielding layer is sleeved on the second bus, the switch module is connected with the first bus and the second bus respectively to switch the transmission line on or off of the first bus and the second bus, the first resistance voltage dividing assembly is connected with the first shielding layer or the second shielding layer, the first detection end of the second resistance voltage dividing assembly is connected with one end of the first shielding layer, the second detection end of the second resistance voltage dividing assembly is connected with one end of the second shielding layer, and the other end of the first shielding layer is connected with the other end of the second shielding layer.

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