Non-intrusive cable monitoring device, assembling method, monitoring system and monitoring method

Abstract

The invention provides a non-intrusive cable monitoring device, an assembling method, a monitoring system and a monitoring method.The bottom end face of a shielding shell is provided with a measuring port a, the measuring port comprises an opening area a, an opening area b and an opening area c, the opening area b corresponds to the measuring port a, and the opening area c corresponds to the opening area b; a first cable groove and a second cable groove are formed in the side wall surface of the moving space, and the insulated cable shielding piece comprises a first part and a second part which are located on the first side and the second side of the measuring port a and respectively correspond to the opening area a and the opening area b, and a third part fixed on the bottom plate; when the movable plate is in the clamping position, the third part is deformed to wrap the bottom of the cable and cover and protect the measuring port, and the first part and the second part cover the top of the cable to form a shielding structure of the cable. According to the invention, a shielding effect can be achieved, and an instant incremental electric signal generated when the non-intrusive monitoring device of the cable is in contact with the metal terminal in the hard pressing plate is avoided.

Description

Technical Field

[0001] The present application relates to the technical field of power grid hard pressure plate status detection, and in particular to a non-invasive cable monitoring device, assembly method, monitoring system and monitoring method. Background Art

[0002] With the development of smart grids, the level of substation automation has greatly improved the efficiency and safety of grid operations. The hard pressure plate, which operates as a secondary device, is the hub connecting distribution network protection and automation devices to the outside world. Therefore, the activation and deactivation status of the hard pressure plate is an artificially created breakpoint in the protection tripping circuit. This breakpoint directly affects the protection function and whether the action output can function normally, providing protection for maintenance and power safety. The hard pressure plate is used to activate or deactivate the corresponding protection function. The management of the hard pressure plate of the relay protection device requires the responsibility of designated personnel. During smart grid operation, when the status of the hard pressure plate changes, it causes the relay protection device to refuse to operate or malfunction, which will seriously affect the safe and reliable operation of power equipment.

[0003] According to substation operating regulations, the voltage between the two ends of the hard pressure plate and ground must be measured before commissioning to prevent relay protection devices from malfunctioning or failing to operate. Currently, voltage measurement is traditionally performed manually, typically using a multimeter. This can easily lead to the control circuit being open due to incorrect multimeter settings, causing a trip.

[0004] like Figure 1 As shown, in the invention patent with publication number CN118884019A, a hard pressure plate voltage monitoring device and a hard pressure plate voltage monitoring system are disclosed, which can convert the sensed cable electric field strength into a voltage signal, thereby realizing non-invasive monitoring of the cable DC voltage at a fixed distance. The device includes an insulating protective shell (i.e., a protective upper cover and a protective shell), a shielding shell (i.e., a shielding upper cover and a shielding body), a movable plate and a measuring component 12. The measuring component 12 and the shielding shell are sequentially placed inside the protective shell. The protective shell includes a protective measuring port opened on its bottom end face, and a cable shielding member fixed on the protective measuring port and connected to the shielding body. A movable plate shielding member 14 is installed on the movable plate. When the movable plate moves to a position below the protective measuring port, the cable shielding member contacts the movable plate shielding member 14 to form a shielding cavity. However, since the cable shielding 13 and the movable plate shielding 14 are both made of metal, if the position of the hard pressure plate voltage monitoring device moves, causing the cable shielding 13 or the movable plate shielding 14 to come into contact with the metal terminals in the hard pressure plate, an instantaneous incremental electrical signal will be generated, causing the hard pressure plate panel cabinet to perform erroneous operations based on the incremental electrical signal, affecting the normal power supply of the power system.

[0005] Therefore, how to prevent the hard pressing plate voltage monitoring device from generating an instantaneous incremental electrical signal after contacting the metal terminal in the hard pressing plate is a problem that needs to be solved urgently. Summary of the Invention

[0006] In response to the shortcomings of the above problems, the present invention provides a non-invasive cable monitoring device, assembly method, monitoring system and monitoring method that not only can achieve a shielding effect, but also can avoid the generation of instantaneous incremental electrical signals when the non-invasive cable monitoring device comes into contact with the metal terminals in the hard pressure plate.

[0007] To achieve the above-mentioned objectives, in a first aspect, the present invention provides a non-invasive cable monitoring device, comprising a protective shell, a movable plate, a shielding shell, an insulating cable shielding member, and a measuring assembly, wherein the measuring assembly and the shielding shell are sequentially placed inside the protective shell, a measuring port a is provided on the bottom end surface of the shielding shell, the bottom end surface of the protective shell is recessed toward the top end surface to form a bottom plate, and a movable space for horizontal movement of the movable plate, a protective measuring port is formed on the bottom plate, the protective measuring port comprises an opening area a, an opening area b, and an opening area c that are sequentially connected, the opening area b corresponding to the measuring port a, a first cable trough and a second cable trough corresponding to each other and respectively connected to the protective measuring port are formed on the side wall surface of the movable space, the insulating cable shielding member comprises a first portion and a second portion located on a first side and a second side of the measuring port a, corresponding to the opening area a and the opening area b, respectively, and a third portion having one end fixed to the bottom end surface of the bottom plate;

[0008] When the movable plate is in the engaged position, the third part is deformed to wrap around the bottom end surface of the cable, covering the protective measuring port, and the first part and the second part respectively cover a part of the top end surface of the cable. The first part, the second part and the third part cooperate to form a shielding structure of the cable.

[0009] In one embodiment, the first portion is fixed on the bottom end surface of the shielding shell and is located on the left side of the measuring port a;

[0010] The second part is fixed on the bottom end surface of the shielding shell and is located on the right side of the measuring port a;

[0011] When the shielding shell is placed inside the protective shell, the first portion and the second portion are sandwiched between the shielding shell and the protective shell, and cover the top end surfaces of the opening area a and the opening area c respectively.

[0012] In one embodiment, the first portion is fixed on the inner side of the bottom end surface of the bottom plate, located on the left side of the opening area b, and covers the top end surface of the opening area a;

[0013] The second portion is fixed to the inner side of the bottom end surface of the bottom plate, is located on the right side of the opening area b, and covers the top end surface of the opening area c.

[0014] In one embodiment, a slot facing downward is formed in the bottom plate at a position adjacent to the protective measurement port, and the top end of the third part is fixed in the slot.

[0015] In one embodiment, the base plate further includes a first protrusion and a second protrusion sequentially located at the rear side of the slot, and the slot, the first protrusion and the second protrusion are located on the same axis.

[0016] In one embodiment, the movable plate includes at least a first step portion, a second step portion, and a third step portion arranged in a stepped manner from bottom to top, and a first position slot and a second position slot are formed on the third step portion to cooperate with the first protrusion, wherein:

[0017] When the first protrusion is engaged with the first position slot, the movable plate is in the first engaging position, the second step portion faces the protective measuring port, and the front end surface of the first step portion is in the same plane as the front end plate of the protective housing;

[0018] When the first protrusion cooperates with the second position slot, the movable plate is in the second engaging position, at least a portion of the third step portion faces the protective measuring port, and the front end surface of the first step portion protrudes from the front end plate of the protective shell.

[0019] In one embodiment, a first mating structure and a second mating structure mating with the second protrusion are further formed on the top surface of the third step portion, the first mating structure is located in front of the first position slot, and the second mating structure is located behind the second position slot. When the second protrusion contacts the second mating structure, the position of the movable plate is restricted, wherein the first mating structure, the first position slot, the second position slot and the second mating structure are on the same axis.

[0020] In a second aspect, the present invention further provides an assembly method for assembling the above-mentioned non-invasive cable monitoring device, comprising the following steps:

[0021] Fixing the top end of the third portion into the slot located on the bottom end surface of the base plate;

[0022] Place the shielding shell with the built-in measurement component in the protective shell so that the measurement port a corresponds to the opening area b, the first part is located on the left side of the measurement port a and covers the top end surface of the opening area a, and the second part is located on the right side of the measurement port a and covers the top end surface of the opening area c;

[0023] The protective upper cover is buckled on the top end surface of the protective shell, and the movable plate is arranged in the movable space in the protective shell.

[0024] In a third aspect, the present invention further provides a monitoring system comprising a plurality of the above-mentioned non-invasive cable monitoring devices and a collector, wherein the collector is connected to each of the non-invasive cable monitoring devices via a shielded cable;

[0025] The non-invasive cable monitoring device is used to output a voltage analog signal of the cable;

[0026] The collector is used to obtain the insertion and retraction status of the hard pressing plate according to the voltage simulation signal.

[0027] In a fourth aspect, the present invention further provides a monitoring method for implementing the above-mentioned monitoring system, comprising the following steps:

[0028] The cables are placed in the first cable trough and the second cable trough, and the movable plate is moved to a desired engagement position so that the first portion of the insulating cable shield is located between the movable plate and the bottom plate, wrapping a portion of the cables and covering the protective measuring port;

[0029] Obtaining a voltage dataset of the hard pressing plate within a preset time period;

[0030] Calculate the difference between the maximum and minimum values ​​in the voltage data set;

[0031] Based on the difference, determine the insertion and retraction status of the hard pressure plate.

[0032] Compared with the prior art, the present invention has one of the following advantages:

[0033] The use of insulated cable shields instead of existing metal shields not only provides a shielding effect, but also prevents the non-invasive monitoring device of the cable from generating instantaneous incremental electrical signals when it comes into contact with the metal terminals in the hard pressure plate, eliminating safety hazards.

[0034] After deformation, the third part of the insulating cable shield wraps around a part of the cable, covers the measuring port, and forms a shielding structure with the first part and the second part. When the measuring end of the cable is placed inside the non-invasive monitoring device of the cable, it can cover the top end face and the bottom end face of the measuring end of the cable, which can enhance the shielding performance against interference signals in the external environment and improve the accuracy of voltage measurement, thereby obtaining the insertion and retraction state of the hard pressure plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is an exploded view of an existing voltage monitoring device;

[0036] Figure 2 is an exploded view of the non-invasive cable monitoring device in this embodiment;

[0037] Figure 3 This is a structural diagram of the non-intrusive cable monitoring device after removing the movable plate in this embodiment;

[0038] Figure 4 : is a structural diagram of the movable plate in this embodiment;

[0039] Figure 5 is a three-dimensional diagram of the non-invasive cable monitoring device in this embodiment in a first engaged state;

[0040] Figure 6 for Figure 5 sectional view of

[0041] Figure 7 for Figure 6 Enlarged view of part A;

[0042] Figure 8 for Figure 5 A diagram showing the state of the non-intrusive cable monitoring device in the first engagement state when combined with the cable;

[0043] Figure 9 for Figure 8 sectional view of

[0044] Figure 10 for Figure 9 Enlarged view of part B;

[0045] Figure 11 A perspective view of the non-invasive cable monitoring device in the second engagement state according to this embodiment;

[0046] Figure 12 for Figure 11 sectional view of

[0047] Figure 13 for Figure 12 Enlarged view of part C;

[0048] Figure 14 for Figure 11 A diagram showing the state of the non-intrusive cable monitoring device in the second engagement state when combined with the cable;

[0049] Figure 15 It is a cross-sectional view of the non-intrusive cable monitoring device in a non-engaged state;

[0050] Figure 16 for Figure 15 Enlarged view of part D in the middle;

[0051] Figure 17 : is a structural diagram of the monitoring system in this embodiment;

[0052] Figure 18 Flowchart of the monitoring method in this embodiment;

[0053] Figure 19 for Figure 18 Voltage waveform diagram in the monitoring method.

[0054] The main reference numerals are as follows:

[0055] 1-protective cover; 11-clip protrusion; 2-protective housing; 21-protective measuring port; 211-opening area a;

[0056] 212 - opening area b; 213 - opening area c; 22 - side panel; 221 - buckle fixing opening; 222 - first slide rail;

[0057] 223 - second slide rail; 224 - first cable trough; 225 - second cable trough; 23 - front end plate; 24 - rear end plate;

[0058] : 25-base plate; 251-first protrusion; 252-second protrusion; 253-slot; 254-first hollow area; 255-second hollow area; 256-third hollow area; 3-movable plate; 31-first slide groove; 32-second slide groove; 33-first step portion; 34-second step portion; 35-third step portion; 36-first position slot; 37-second position slot; 38-first groove; 39-second groove; 310-first baffle; 311-second baffle; 4-shielding shell; 41-measuring port a; 5-insulated cable shield; 51-first part; 52-second part; 53-third part; 6-cable; 7-non-invasive cable monitoring device; 8-shielded wire; 9-collector; 10-communication aerial plug; 11-probe connection aerial plug; 12-measuring component; 13-cable shield; 14-movable plate shield. DETAILED DESCRIPTION

[0059] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0060] In the description of the present invention, it should be understood that the terms "upper", "lower", "top surface", "bottom surface", "inside", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 of the present invention. It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be a centrally arranged component at the same time. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0061] Example 1

[0062] like Figures 2 to 10 As shown, this embodiment provides a non-invasive cable monitoring device, comprising a protective cover 1, a protective housing 2, a movable plate 3, a shielding housing 4, an insulating cable shield 5, and a measuring assembly 12. The protective cover 1 and the protective housing 2 cooperate to form an insulating protective shell. The measuring assembly 12 is disposed within the shielding housing 4 and is grounded to the shielding housing 4. The insulating protective shell is sleeved over the outer surface of the shielding housing 4 to protect the shielding housing 4. Corresponding cable measurement holes (i.e., corresponding protective measurement ports 21 and measurement ports a41) are formed in the protective housing 2, the insulating cable shield 5, and the shielding housing 4. When a cable 6 having a hard pressure plate outlet is provided within the cable measurement hole, the voltage of the hard pressure plate can be obtained based on the electric field generated by the cable 6 through the measuring assembly 12.

[0063] The protective cover 1, the protective shell 2, and the movable plate 3 can be made of other insulating materials such as nylon, ABS plastic, ASA plastic, etc., and are used to protect the shielding shell 4. At the same time, they also avoid accidental contact with electricity when using the cable 6 at the hard pressure plate outlet for voltage measurement, thereby ensuring the safe use of the non-invasive cable monitoring device.

[0064] The shielding shell 4 can be made of metal. When the shielding shell 4 is grounded to the measuring component 12 , the shielding shell 4 can shield interference signals from the external environment, making the measuring component 12 more accurate in measuring the cable 6 .

[0065] The measuring component 12 can use a vibration capacitance electric field sensor, a rotating blade electric field sensor, a piezoelectric film electric field sensor, a micro-electro-mechanical system (MEMS) electric field sensor, a direct induction electric field sensor, or the like to measure the voltage through the electric field of the cable 6. The sensing end of the measuring component 12 corresponds to the measuring hole of the cable.

[0066] The insulated cable shield 5 is made of a flexible FPC material or other resilient insulating shielding material. A shielding film is wrapped around the FPC material, providing shielding insulation. When the insulated cable shield 5 is wrapped around the cable 6, it provides a shielding effect. Furthermore, when the insulated cable shield 5 contacts the metal terminals in the rigid pressure plate, no transient incremental electrical signal is generated, eliminating safety hazards.

[0067] In this embodiment, the protective housing 2 is a rectangular housing with an open top. A protective measuring port 21 is defined on the bottom end surface of the protective housing 2, and the protective cover 1 covers the top opening of the protective housing 2. The movable plate 3 is located on the bottom end surface of the protective housing 2 and may be positioned on the bottom end surface of the protective housing 2. When the movable plate 3 moves to an engaged position (i.e., a first engaged position or a second engaged position), it is positioned below the protective measuring port 21, such that a portion of the insulating cable shield 5 obstructs the protective measuring port 21 and a portion of the cable 6 is enclosed.

[0068] Furthermore, a snap protrusion 11 is provided on the protective upper cover 1, and a snap fixing opening 221 is provided on the side panel 22 of the protective shell 2, which is at the same position as and matches the snap protrusion 11, and a shielding wire through hole is also provided on the rear end panel 24 of the protective shell 2.

[0069] Furthermore, the protective housing 2 includes a front panel 23, side panels 22, a rear panel 24, and a bottom panel 25. The bottom end surface of the protective housing 2 is recessed toward the top end surface to form the bottom panel 25, which also provides a space for horizontal movement of the movable panel 3. The bottom panel 25 is formed, from front to back, with the protective measuring port 21, slot 253, first protrusion 251, and second protrusion 252. The center points of the protective measuring port 21, slot 253, first protrusion 251, and second protrusion 252 are aligned on the same axis.

[0070] Since the slot 253 is located adjacent to the protection measurement port 21 , a portion of the insulating cable shielding member 5 can shield the protection measurement port 21 .

[0071] Furthermore, the protection measurement port 21 includes an opening area a211, an opening area b212 and an opening area c213 that are connected in sequence.

[0072] Furthermore, a first hollow area 254 and a second hollow area 255 are formed on the left and right sides of the first protrusion 251, respectively, and a third hollow area 256 is formed on the outer side of the second protrusion 252, surrounding a portion thereof. The first hollow area 254 and the second hollow area 255 allow the first protrusion 251 to move in a direction opposite to the pressing force when squeezed, and the third hollow area 256 allows the second protrusion 252 to move in a direction opposite to the pressing force when squeezed.

[0073] Preferably, the first protrusion 251 is an outwardly convex arc-shaped protrusion, and the second protrusion 252 is an inverted protrusion, wherein the bottom end of the first protrusion 251 is lower than the bottom end of the second protrusion 252.

[0074] Furthermore, the bottom end surfaces of the two side panels 22 are each recessed upward to form a first cable trough 224 and a second cable trough 225. The tops of the first cable trough 224 and the second cable trough 225 are located above the bottom panel 25, respectively. This allows the opening area a211 to communicate with the first cable trough 224, and the opening area b212 to communicate with the second cable trough 225. When the cable 6 is placed within the first and second cable troughs 224, 225, it is also placed within the protective measurement port 21, facilitating measurement of the cable 6 by the measurement assembly 12.

[0075] Furthermore, in the bottom end surface of one of the side panels 22, a first slide rail 222 is formed on the end surface other than the first cable groove 224, and in the bottom end surface of the other side panel 22, a second slide rail 223 is formed on the end surface other than the second cable groove 225, wherein the first slide rail 222 and the second slide rail 223 are in the same plane, so that the movable plate 3 can move horizontally in the moving space.

[0076] Furthermore, the insulated cable shield 5 includes a first portion 51, a second portion 52, and a third portion 53. The first portion 51 is secured to the bottom end surface of the shielding shell with adhesive and is located to the left of the measurement opening a. The second portion 52 is secured to the bottom end surface of the shielding shell with adhesive and is located to the right of the measurement opening a. The top portion of the third portion 53 is secured to the slot 253 with adhesive, and the bottom portion of the third portion 53 is secured to the slot 253 with adhesive and extends toward the lower area of ​​the base plate. When the shielding shell is placed within the protective shell, the first and second portions are sandwiched between the shielding shell and the protective shell, covering the top end surfaces of the opening area a and the opening area c, respectively.

[0077] The third portion 53 is a free end. When the movable plate 3 is in the unengaged position, a portion of the third portion 53 can be located outside the movable space. When the movable plate 3 is moved to the engaged position, the third portion 53 is located between the movable plate 3 and the bottom plate 25, wrapping around the bottom end surface of the cable 6 and covering the protective measuring port 21.

[0078] In addition, since the first part 51 covers the top end surface of the opening area a and the second part 52 covers the top end surface of the opening area c, when the movable plate 3 moves to the engaged position, the third part 53 wraps the bottom end surface of the cable 6 and covers the protective measuring port 21. A part of the cable 6 is placed in the first cable groove 224, and its top end surface is covered by the first part 51. The other part of the cable 6 is placed in the second cable groove 225, and its top end surface is covered by the second part 52, thereby forming a shielding structure for the cable 6.

[0079] In this embodiment, a first slide groove 31 that cooperates with the first slide rail 222 and a second slide groove 32 that cooperates with the second slide rail 223 are formed on the side wall surface of the movable plate 3. The top end surface of the movable plate 3 includes a first step portion 33, a second step portion 34, and a third step portion 35 arranged from bottom to top. The first step portion 33, the second step portion 34, and the third step portion 35 are arranged in a stepped structure, and the first slide groove 31 and the second slide groove 32 are located between the second step portion 34 and the first step portion 33.

[0080] Furthermore, a first position engagement groove 36 is formed on the top end surface of the third step portion 35, which engages with the first protrusion 251. When the first protrusion 251 is positioned within the first position engagement groove 36, the movable plate 3 is in the first engagement position, and the front end surface of the movable plate 3 is flush with the front end plate 23 of the protective housing 2. At this point, the second step portion 34 faces the protective measuring port 21, and the fourth portion 55 is positioned above the second step portion 34 and the first step portion 33.

[0081] Furthermore, the top end surface of the third step portion 35 also includes a first groove 38 and a first baffle 310 located in front of the first position slot 36, and a second baffle 311 and a second groove 39 located behind the first position slot 36. The second protrusion 252 cooperates with the second baffle 311 to form a limiting structure of the movable plate 3, wherein the first groove 38, the first baffle 310, the first position slot 36, the second baffle 311 and the second groove 39 are on the same axis.

[0082] Preferably, positions of the first groove 38 , the first baffle 310 , the second baffle 311 and the second groove 39 correspond to positions of the second protrusion 252 .

[0083] Because the top end surface of the first baffle 310 is an inclined surface, the second protrusion 252 can easily pass through the top surface of the third step 35, allowing the movable plate 3 to move forward and be placed in the movable space. Because the top end surface of the second baffle 311 is a parallel surface, when the movable plate 3 moves backward, the second protrusion 252 and the second baffle 311 interfere with each other, limiting the position of the movable plate 3 and preventing the movable plate 3 from escaping from the movable space during movement.

[0084] Example 2

[0085] This embodiment provides a non-invasive cable monitoring device. The difference between this embodiment and the first embodiment is that:

[0086] The first portion is secured to the inner side of the bottom end surface of the base plate, to the left of opening area b, and covers the top end surface of opening area a. The second portion is secured to the inner side of the bottom end surface of the base plate, to the right of opening area b, and covers the top end surface of opening area c. When the shielding case is placed inside the protective case, both the first and second portions are sandwiched between the shielding case and the protective case.

[0087] Example 3

[0088] like Figures 11 to 14 As shown, this embodiment provides a non-invasive cable monitoring device. The difference between this embodiment and the first or second embodiment is that:

[0089] A first position slot 36 and a second position slot 37 are formed on the top end surface of the third step portion 35, which cooperate with the first protrusion 251. The second position slot 37 is located behind the first position slot 36. When the first protrusion 251 is placed in the second position slot 37, the movable plate 3 is located in the second engaging position. The front end surface of the movable plate 3 and a portion of the first step portion 33 are both located in front of the front end plate 23 of the protective housing 2. The front end surface of the second step portion 34 is adjacent to the inner wall surface of the movable space, or the front end surface of the second step portion 34 conflicts with the inner wall surface of the movable space. At this time, at least a portion of the third step portion 35 faces the protective measuring port 21.

[0090] Furthermore, the second baffle 311 and the second groove 39 are located in sequence behind the first position slot 36, and the second protrusion 252 cooperates with the second baffle 311 to form a limiting structure of the movable plate 3, wherein the first groove 38, the first baffle 310, the first position slot 36, the second position slot 37, the second baffle 311 and the second groove 39 are on the same axis.

[0091] Compared with the first and second embodiments, since the position of the second step portion 34 is lower than the position of the third step portion 35, under the same wire diameter, after the cable 6 is placed in the first cable groove 224 and the second cable groove 225, the distance between the cable 6 and the measuring component 12 in the second embodiment is closer, and the accuracy of the obtained electrical signal is higher.

[0092] Example 4

[0093] This embodiment provides an assembly method for assembling the non-intrusive cable monitoring device described in the first, second, or third embodiment, including the following steps:

[0094] S1. Fix the top end of the third part into the slot located on the bottom end surface of the base plate;

[0095] S2. Place the shielding shell with the built-in measurement component in the protective shell so that the measurement port a corresponds to the opening area b, the first portion is located on the left side of the measurement port a and covers the top end surface of the opening area a, and the second portion is located on the right side of the measurement port a and covers the top end surface of the opening area c;

[0096] S3. Buckle the protective upper cover onto the top end surface of the protective shell, and set the movable plate in the movable space in the protective shell.

[0097] Exemplarily, in one embodiment, in step S2, the first part is fixed to the bottom end face of the shielding shell by adhesive and is located on the left side of the measuring port a, the second part is fixed to the bottom end face of the shielding shell by adhesive and is located on the right side of the measuring port a, the top end of the third part is fixed in the slot by adhesive, and the bottom end of the third part is fixed in the slot by adhesive and extends to the lower area of ​​the base plate.

[0098] For example, in another embodiment, in step S2, the first portion is fixed to the inner side of the bottom end surface of the base plate, located to the left of opening region b, and covering the top end surface of opening region a. The second portion is fixed to the inner side of the bottom end surface of the base plate, located to the right of opening region b, and covering the top end surface of opening region c. The top end of the third portion is fixed to the slot with adhesive, and the bottom end of the third portion is fixed to the slot with adhesive and extends toward the lower area of ​​the base plate.

[0099] Example 5

[0100] like Figure 17As shown, this embodiment provides a hard pressure plate voltage monitoring system, including a collector 9 and multiple non-invasive cable monitoring devices 7 in Example 1, Example 2 or Example 3. The collector 9 includes at least one communication aerial plug 10 and at least one probe connection aerial plug 11. The probe connection aerial plug 11 of the collector 9 is connected to the non-invasive cable monitoring device 7 through a shielded wire 8. The non-invasive cable monitoring device 7 is used to detect the voltage of the hard pressure plate outlet cable and output the voltage analog signal of the cable 6 at the hard pressure plate outlet; the collector 9 is used to obtain the insertion and withdrawal status of the hard pressure plate based on the voltage analog signal. The collector 9 includes a single-chip microcomputer module and a probe interface module, the single-chip microcomputer module is electrically connected to the probe interface module, and the probe interface module is connected to the shielded wire 8. The probe interface module is used to amplify the voltage analog signal; the single-chip microcomputer module is used to convert the received voltage analog signal into a data signal, i.e., voltage data, according to the judgment of the voltage data, to obtain the insertion and withdrawal status of the hard pressure plate.

[0101] To ensure safe use of the power supply, the collector 9 also includes a power supply module and a power supply protection module. The power supply protection module is electrically connected to the power supply module, which is in turn electrically connected to the single-chip microcomputer module. The power supply protection module is used to protect the single-chip microcomputer module and has functions such as isolation, short-circuit protection, overvoltage protection, undervoltage protection, overcurrent protection, voltage stabilization, and noise reduction. The power supply module is used to provide power to the single-chip microcomputer module.

[0102] To ensure that connected devices do not affect the MCU module, the data collector also includes a serial communication module and a serial protection module. The serial protection module is electrically connected to the serial communication module, which in turn is electrically connected to the MCU module. The serial protection module protects the serial communication module from voltage surges that could damage the serial communication module and MCU module. The serial communication module is used to establish communication with other devices and can transmit the status of the hard pressure plate.

[0103] Example 6

[0104] like Figure 18 As shown, this embodiment provides an operating method for operating the non-intrusive cable monitoring device in the above-mentioned embodiment 1, embodiment 2, or embodiment 3, including the following steps:

[0105] S101. The cables are placed in the first cable trough and the second cable trough, and the movable plate is moved to the required engagement position so that the first portion of the insulating cable shield is located between the movable plate and the bottom plate, wrapping a portion of the cable and covering the protective measuring port.

[0106] Specifically, the cables are placed in the first cable groove and the second cable groove, and the movable plate is pushed. Through the matching first protrusion and the first position slot, or the first protrusion and the second position slot, the movable plate is in the first engaging position or the second engaging position. The insulating cable shield can wrap a part of the cable and cover the protective measuring port.

[0107] S102: Acquire a voltage data set of the hard pressing plate within a preset time period.

[0108] Specifically, a non-invasive cable monitoring device can detect the voltage of the cable at the hard platen outlet. The data measured by the non-invasive cable monitoring device is then sent to the collector, which then receives the voltage data. Voltage data from the most recent period is collected to form a voltage dataset. For example, if the preset time period is ten minutes, voltage data from the current moment and the previous ten minutes are collected to form a voltage dataset.

[0109] The preset time period is determined as follows:

[0110] Obtain decay change waveforms of the hard pressure plate monitoring voltage under different environments. The decay change waveforms refer to the voltage changes of the hard pressure plate. In a specific embodiment, the horizontal axis of the decay change waveform is time, and the vertical axis is the voltage of the hard pressure plate. It should be understood that the voltage changes of the hard pressure plate are different in different environments. Different environments mean that at least one factor such as humidity and air pressure of the two environments is different. At the same time, the wire materials of the hard pressure plate are different, and the voltage changes are also different. In a specific embodiment, obtain two decay change waveforms. The humidity of the environment where the two decay change waveforms are located is different. The two figures are respectively referred to as the first waveform and the second waveform. According to the decay change waveforms, calculate the decay time under different environments. The decay time refers to the time it takes for the voltage to drop to a specified value when the hard pressure plate switches from the input state to the exit state. The specified value is set by the staff according to the actual situation. The maximum value of the decay time under different environments is used as the preset time period.

[0111] S103: Calculate the difference between the maximum value and the minimum value in the voltage data set.

[0112] S104: Determine the insertion and retraction status of the hard pressing plate according to the difference.

[0113] When the difference is greater than the preset difference value, the state of the hard pressure plate is switched. For example, if the current state of the hard pressure plate is in the engaged state, when the difference is greater than the preset difference value, the state of the hard pressure plate is changed from the engaged state to the withdrawn state. For another example, if the current state of the hard pressure plate is in the withdrawn state, when the difference is greater than the preset difference value, the state of the hard pressure plate is changed from the withdrawn state to the engaged state.

[0114] In a specific embodiment, the DC voltage is 110V when the hard pressing plate is in the input state. Figure 19 The test process includes the hard pressure plate exit state s0, in which the voltage remains at 0V. When the hard pressure plate is engaged, corresponding to section s1, the voltage value Uo output by the hard pressure plate voltage monitoring device 10 rises briefly and stabilizes at 110V. When the hard pressure plate is exited or disconnected due to an unreliable connection, corresponding to section s2, the voltage waveform changes to reflect the slowly decaying discharge process of the suspended metal body. The decay change value Δy is set to the difference between the stable voltage of 110V and 10% of the stable voltage of 110V, i.e., Δy = 110V - 110V × 10%. Under two different humidity conditions, the decay time Δt experienced when the difference between Uo and the measured DC voltage value of 110V is greater than Δy is recorded, namely Δt1 and Δt2, respectively.

[0115] Due to changes in the environment, the decay time Δt will vary greatly. Figure 19 , with a larger decay time Δt, setting a time threshold ΔT (preset time period). If the monitoring device output voltage Uo remains stable at around 110V, the hard pressure plate is considered in operation. However, due to changes in the external environment, Uo may jump within ΔT. If the maximum change in Uo within ΔT is less than Δy, the hard pressure plate is considered unchanged. If the maximum change in Uo is not less than Δy, the hard pressure plate is considered to have changed. Δy is the preset difference value.

[0116] The above description is merely a preferred embodiment of the present invention and is intended to be illustrative rather than restrictive of the present invention. Those skilled in the art will appreciate that many changes, modifications, and even equivalents may be made to the present invention within the spirit and scope of the claims, all of which fall within the scope of protection of the present invention.

Claims

1. A non-invasive cable monitoring device, comprising a protective shell, a movable plate, a shielding shell, an insulating cable shielding member and a measuring assembly, wherein the measuring assembly and the shielding shell are sequentially placed inside the protective shell, a measuring port a is provided on the bottom end face of the shielding shell, the bottom end face of the protective shell is recessed toward the top end face to form a bottom plate, and a movable space for the movable plate to move horizontally, a protective measuring port is formed on the bottom plate, the protective measuring port comprises an opening area a, an opening area b and an opening area c that are sequentially connected, the opening area b corresponds to the measuring port a, a first cable trough and a second cable trough corresponding to each other and respectively connected to the protective measuring port are formed on the side wall of the movable space, characterized in that: The insulated cable shield comprises a first portion and a second portion located on a first side and a second side of the measuring port a, corresponding to the opening area a and the opening area b, respectively, and a third portion having one end fixed to the bottom end surface of the bottom plate; When the movable plate is in the engaged position, the third part is deformed to wrap around the bottom end surface of the cable, covering the protective measuring port, and the first part and the second part respectively cover a part of the top end surface of the cable. The first part, the second part and the third part cooperate to form a shielding structure of the cable.

2. The non-invasive cable monitoring device according to claim 1, characterized in that: The first part is fixed on the bottom end surface of the shielding shell and is located on the left side of the measuring port a; The second part is fixed on the bottom end surface of the shielding shell and is located on the right side of the measuring port a; When the shielding shell is placed inside the protective shell, the first portion and the second portion are sandwiched between the shielding shell and the protective shell, and cover the top end surfaces of the opening area a and the opening area c respectively.

3. The non-invasive cable monitoring device according to claim 1, characterized in that: The first portion is fixed on the inner side of the bottom end surface of the bottom plate, is located on the left side of the opening area b, and covers the top end surface of the opening area a; The second portion is fixed to the inner side of the bottom end surface of the bottom plate, is located on the right side of the opening area b, and covers the top end surface of the opening area c.

4. The non-invasive cable monitoring device according to claim 2 or 3, characterized in that: A slot facing downward is formed in the bottom plate at a position adjacent to the protection measurement port, and the top end of the third part is fixed in the slot.

5. The non-invasive cable monitoring device according to claim 4, characterized in that: The bottom plate further includes a first protrusion and a second protrusion sequentially located at the rear side of the slot, and the slot, the first protrusion and the second protrusion are located on the same axis.

6. The non-invasive cable monitoring device according to claim 5, characterized in that: The movable plate at least includes a first step portion, a second step portion, and a third step portion arranged in a stepped shape from bottom to top, and a first position clamping groove and a second position clamping groove matched with the first protrusion are formed on the third step portion, wherein: When the first protrusion is engaged with the first position slot, the movable plate is in the first engaging position, the second step portion faces the protective measuring port, and the front end surface of the first step portion is in the same plane as the front end plate of the protective housing; When the first protrusion cooperates with the second position slot, the movable plate is in the second engaging position, at least a portion of the third step portion faces the protective measuring port, and the front end surface of the first step portion protrudes from the front end plate of the protective shell.

7. The non-invasive cable monitoring device according to claim 6, characterized in that: A first mating structure and a second mating structure mating with the second protrusion are also formed on the top surface of the third step portion, the first mating structure is located in front of the first position slot, and the second mating structure is located behind the second position slot. When the second protrusion contacts the second mating structure, the position of the movable plate is restricted, wherein the first mating structure, the first position slot, the second position slot and the second mating structure are on the same axis.

8. An assembly method, characterized in that: Used to assemble the non-invasive cable monitoring device according to any one of claims 1 to 7, characterized in that it includes the following steps: Fixing the top end of the third portion into the slot located on the bottom end surface of the base plate; Place the shielding shell with the built-in measurement component in the protective shell so that the measurement port a corresponds to the opening area b, the first part is located on the left side of the measurement port a and covers the top end surface of the opening area a, and the second part is located on the right side of the measurement port a and covers the top end surface of the opening area c; The protective upper cover is buckled on the top end surface of the protective shell, and the movable plate is arranged in the movable space in the protective shell.

9. A monitoring system, characterized in that: The device comprises a plurality of non-invasive cable monitoring devices according to any one of claims 1 to 7, and a collector, wherein the collector is connected to each of the non-invasive cable monitoring devices via a shielded wire; The non-invasive cable monitoring device is used to output a voltage analog signal of the cable; The collector is used to obtain the insertion and retraction status of the hard pressing plate according to the voltage simulation signal.

10. A monitoring method, characterized in that: A monitoring system for implementing any one of claims 9, comprising the following steps: The cables are placed in the first cable trough and the second cable trough, and the movable plate is moved to a desired engagement position so that the first portion of the insulating cable shield is located between the movable plate and the bottom plate, wrapping a portion of the cables and covering the protective measuring port; Obtaining a voltage data set of the hard pressing plate within a preset time period; Calculate the difference between the maximum and minimum values ​​in the voltage data set; Based on the difference, determine the insertion and retraction status of the hard pressure plate.

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