Non-intrusive voltage monitoring device, monitoring system and monitoring method

Abstract

The invention provides a non-intrusive voltage monitoring device, monitoring system and monitoring method.A measuring assembly and a shielding shell are sequentially arranged in a protective shell, a measuring opening a is formed in the bottom end face of the shielding shell, and a bottom plate and a moving space for a moving plate to move are formed after the bottom end face of the protective shell is sunken; a protective measuring port corresponding to the measuring port a is formed in the bottom plate, a first cable groove and a second cable groove which correspond to each other and are respectively communicated with the protective measuring port are formed in the side wall face of the moving space, and the cable shielding piece is a flexible insulated cable shielding piece and comprises a first part which penetrates through the bottom plate and is located in the moving space and a second part which penetrates through the bottom plate and is located in the moving space. When the movable plate is in the clamping position, the first part wraps a part of the cable after being deformed and covers and protects the measuring port. The non-intrusive voltage monitoring device can be ensured not to generate an instant incremental electric signal when the non-intrusive voltage monitoring device is in contact with the metal terminal in the hard pressing plate, and potential safety hazards are eliminated.

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 voltage monitoring device, 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, the invention patent with publication number CN118884021A discloses a hard pressure plate voltage monitoring device, assembly method and system with a shielding cavity, 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 avoid the hard pressure plate voltage monitoring device from generating an instantaneous incremental electric signal after contacting the metal terminal in the hard pressure plate is a problem to be solved. SUMMARY

[0006] In view of the above problems, the present application provides a non-invasive voltage monitoring device, monitoring system and monitoring method which can ensure that the hard pressure plate voltage monitoring device will not generate an instantaneous incremental electric signal when contacting the metal terminal in the hard pressure plate.

[0007] To achieve the above-mentioned purpose, in a first aspect, the present application provides a non-invasive voltage monitoring device, comprising a protective shell, a moving plate, a shielding shell, a flexible cable shielding member and a measurement assembly, the measurement assembly and the shielding shell are sequentially arranged inside the protective shell, a measurement port a is formed on the bottom end face of the shielding shell, the bottom end face of the protective shell is recessed towards the top end face to form a bottom plate and a moving space for horizontal movement of the moving plate, a protective measurement port corresponding to the measurement port a is formed on the bottom plate, a first cable slot and a second cable slot corresponding to and respectively communicating with the protective measurement port are formed on the side wall surface of the moving space, the cable shielding member is a flexible insulated cable shielding member, the flexible cable shielding member comprises a first part located in the moving space after penetrating through the bottom plate, wherein:

[0008] When the moving plate is in the engaged position, the first part is deformed to wrap a part of the cable and cover the protective measurement port.

[0009] In one embodiment, when the moving plate is in the disengaged position, a part of the first part is located outside the moving space.

[0010] In one embodiment, the flexible cable shielding member further comprises a third part clamped between the protective shell and the shielding shell, and a second part extending towards the bottom plate, and the first part, the second part and the third part are connected, wherein:

[0011] A measurement port b communicating with the measurement port a and the protective measurement port is formed on the third part.

[0012] In one embodiment, the third part is connected with the inner wall surface of the protective shell or the outer wall surface of the shielding shell.

[0013] In one of the embodiments, the bottom plate further comprises a shielding hole for the first part to pass through, and a first protrusion and a second protrusion sequentially arranged at the back side of the shielding hole, wherein the shielding hole is arranged adjacent to the position of the protection measuring port, and the shielding hole, the first protrusion and the second protrusion are arranged on the same axis.

[0014] In one of the embodiments, the moving plate comprises a first step, a second step and a third step arranged in a step shape from bottom to top, and the first position clamping groove and the second position clamping groove matched with the first protrusion are formed on the third step, wherein:

[0015] When the first protrusion is matched with the first position clamping groove, the moving plate is in the first clamping position, the second step is directed to the protection measuring port, and the front end surface of the first step is in the same plane with the front end plate of the protection shell;

[0016] When the first protrusion is matched with the second position clamping groove, the moving plate is in the second clamping position, at least a part of the third step is directed to the protection measuring port, and the front end surface of the first step protrudes from the front end plate of the protection shell.

[0017] In one of the embodiments, the first matching structure and the second matching structure matched with the second protrusion are further formed on the top surface of the third step, the first matching structure is arranged in front of the first position clamping groove, the second matching structure is arranged behind the second position clamping groove, and the position of the moving plate is limited when the second protrusion is in contact with the second matching structure, wherein the first matching structure, the first position clamping groove, the second position clamping groove and the second matching structure are arranged on the same axis.

[0018] In one of the embodiments, the first matching structure comprises a first groove and a first baffle arranged in front and back, wherein the top end surface of the first baffle is an inclined surface;

[0019] The second matching structure comprises a second baffle and a second groove arranged in front and back, wherein the top end surface of the second baffle is a flat surface, and the position of the moving plate is limited when the bottom end of the second protrusion is in contact with the second baffle.

[0020] In the second aspect, the application further provides a monitoring system, comprising a plurality of the above-mentioned non-intrusive voltage monitoring devices and a collector, wherein the collector is connected with each of the non-intrusive voltage monitoring devices through a shielding line.

[0021] The non-intrusive voltage monitoring device is used for outputting the voltage analog signal of the cable.

[0022] The collector is configured to obtain the on-off state of the hard voltage plate according to the voltage analog signal.

[0023] In a third aspect, the present application further provides a monitoring method for implementing the monitoring system described above, comprising the following steps:

[0024] The cable is placed in the first cable slot and the second cable slot, and the moving plate is moved to the desired clamping position, so that the first part of the flexible cable shield is located between the moving plate and the bottom plate, wraps a part of the cable, and covers the measurement port;

[0025] Obtain the voltage data set of the hard voltage plate in a preset time period;

[0026] Calculate the difference between the maximum value and the minimum value in the voltage data set;

[0027] According to the difference, the on-off state of the hard voltage plate is determined.

[0028] Compared with the prior art, the present application has one of the following advantages:

[0029] After adopting the flexible insulating cable shield instead of the existing metal shield, the flexible insulating cable shield can cover a part of the cable and the cable measurement port while pushing the moving plate, which not only has a shielding effect, but also avoids the situation that an instantaneous incremental electric signal is generated when the non-intrusive voltage monitoring device contacts the metal terminal in the hard voltage plate, eliminating the safety hazard;

[0030] Under the same wire diameter, by adjusting the clamping position of the moving plate, the distance between the cable and the measurement assembly can be set to obtain electric signals of different accuracies; in addition, since the clamping position of the moving plate can be adjusted, the non-intrusive voltage monitoring sensor can be clamped with cables of different diameters according to actual needs, thereby increasing the applicability of the non-intrusive voltage monitoring device;

[0031] By additionally providing the first protrusion, the first position clamping groove and the second position clamping groove, the moving plate can be fixed at the current clamping position, thereby increasing the clamping performance of the cable. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 is an exploded view of the existing voltage monitoring device;

[0033] Figure 2 is an exploded view of the voltage monitoring device in the present embodiment;

[0034] Figure 3 is a structural view of the non-intrusive voltage monitoring device without the moving plate in the present embodiment;

[0035] Figure 4 is a structural view of the moving plate in the present embodiment;

[0036] Figure 5 is a perspective view of the non-invasive voltage monitoring device in the first engaging state according to the embodiment;

[0037] Figure 6 for Figure 5 sectional view of

[0038] Figure 7 for Figure 6 Enlarged view of part A;

[0039] Figure 8 for Figure 5 A diagram showing the state of the non-intrusive voltage monitoring device in the first engagement state when combined with the cable;

[0040] Figure 9 for Figure 8 sectional view of

[0041] Figure 10 for Figure 9 Enlarged view of part B;

[0042] Figure 11 A perspective view of the non-invasive voltage monitoring device in the second engagement state according to this embodiment;

[0043] Figure 12 for Figure 11 sectional view of

[0044] Figure 13 for Figure 12 Enlarged view of part C;

[0045] Figure 14 for Figure 11 A diagram showing the state of the non-intrusive voltage monitoring device in the second engagement state when combined with the cable;

[0046] Figure 15 It is a cross-sectional view of the non-intrusive voltage monitoring device in a non-engaged state;

[0047] Figure 16 for Figure 15 Enlarged view of part D in the middle;

[0048] Figure 17 : is a structural diagram of the monitoring system in this embodiment;

[0049] Figure 18 Flowchart of the monitoring method in this embodiment;

[0050] Figure 19 for Figure 18 Voltage waveform diagram in the monitoring method.

[0051] The main reference numerals are as follows:

[0052] 1 - protection cover; 11 - buckle protrusion; 2 - protection housing; 21 - protection measurement port; 211 - opening area a;

[0053] 212 - opening area b; 213 - opening area c; 22 - side plate; 221 - buckle fixing port; 222 - first sliding rail;

[0054] 223 - second sliding rail; 224 - first cable slot; 225 - second cable slot; 23 - front end plate; 24 - rear end plate;

[0055] 25 - bottom plate; 251 - first protrusion; 252 - second protrusion; 253 - shield hole; 254 - first hollow area;

[0056] 255 - second hollow area; 256 - third hollow area; 3 - moving plate; 31 - first sliding groove; 32 - second sliding groove; 33 - first step part; 34 - second step part; 35 - third step part; 36 - first position clamping groove; 37 - second position clamping groove; 38 - first recess; 39 - second recess; 310 - first baffle; 311 - second baffle; 4 - shield housing; 41 - front recess; 42 - measurement port a; 5 - flexible insulating cable shield; 51 - first part; 52 - second part; 53 - measurement port b; 54 - third part; 55 - fourth part; 6 - cable; 7 - non-intrusive voltage monitoring device; 8 - shielded wire; 9 - collector; 10 - communication plug; 11 - probe connection plug; 12 - measurement assembly; 13 - cable shield; 14 - moving plate shield. DETAILED DESCRIPTION

[0057] In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions of the present application will be described below in connection with specific embodiments and corresponding drawings. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0058] 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.

[0059] Example 1

[0060] like Figures 2 to 10 As shown, this embodiment provides a non-invasive voltage monitoring device, including a protective cover 1, a protective shell 2, a movable plate 3, a shielding shell 4, a flexible insulating cable shield 5, and a measuring assembly 12. The protective cover 1 and the protective shell 2 cooperate to form an insulating protective shell. The measuring assembly 12 is placed inside the shielding shell 4 and is grounded to the shielding shell 4. The insulating protective shell is sleeved on the outside of the shielding shell 4 to protect the shielding shell 4. Corresponding cable measurement holes (i.e., corresponding protective measurement port 21, measurement port a41, and measurement port b53) are formed on the protective shell 2, the flexible insulating cable shield 5, and the shielding shell 4. When a cable 6 with a hard pressure plate outlet is provided in 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.

[0061] 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 voltage monitoring device.

[0062] 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 .

[0063] 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.

[0064] The flexible insulation cable shield 5 is made of FPC material with certain elasticity, or other elastic insulation shielding material. A shielding film is wrapped outside the FPC material to make it have shielding insulation performance, which can play a shielding role when the flexible insulation cable shield 5 wraps the cable 6. In addition, when the flexible insulation cable shield 5 comes into contact with the metal terminal in the hard pressing plate, no instantaneous incremental electric signal will be generated, which can eliminate the safety hazard.

[0065] In the embodiment, the protection shell 2 is a rectangular shell with an open top end, a protection measurement opening 21 is formed on the bottom end face of the protection shell 2, and the protection cover 1 covers the top end opening of the protection shell 2. The moving plate 3 is located on the bottom end face of the protection shell 2 and can move on the bottom end face of the protection shell 2. When the moving plate 3 moves to the clamping position (i.e., the first clamping position or the second clamping position), it is located at the lower end position of the protection measurement opening 21, so that a part of the flexible insulation cable shield 5 blocks the protection measurement opening 21 and wraps a part of the cable 6.

[0066] Further, the protection cover 1 is provided with a buckle protrusion 11, and the side plate 22 of the protection shell 2 is provided with a buckle fixing opening 221 which is located at the same position as the buckle protrusion 11 and cooperates with the buckle protrusion 11. The rear end plate 24 of the protection shell 2 is also provided with a shielding line through hole.

[0067] Further, the protection shell 2 includes a front end plate 23, a side plate 22, a rear end plate 24 and a bottom plate 25. The bottom end face of the protection shell 2 is recessed towards the top end face to form the bottom plate 25 and a moving space for the horizontal movement of the moving plate 3. The bottom plate 25 is sequentially provided with the protection measurement opening 21, the shielding member through hole 253, the first protrusion 251 and the second protrusion 252 from front to back. The center point of the protection measurement opening 21, the center point of the shielding member through hole 253, the center point of the first protrusion 251 and the center point of the second protrusion 252 are on the same axis.

[0068] Since the position of the shielding member through hole 253 is adjacent to the position of the protection measurement opening 21, it is convenient for a part of the flexible insulation cable shield 5 to block the protection measurement opening 21.

[0069] Preferably, the shielding member through hole 253 is a horn-shaped structure with a large top end opening and a small bottom end opening. The large top end opening faces the inside of the protection shell 2, and the small bottom end opening faces the moving space. In this way, the flexible insulation cable shield 5 can easily pass through the shielding member through hole 253.

[0070] Further, the protection measurement opening 21 includes an opening area a211, an opening area b212 and an opening area c213 which are sequentially connected.

[0071] Further, the first protrusion 251 is formed with a first hollow area 254 and a second hollow area 255 on the left and right sides of the first protrusion 251 respectively, and the second protrusion 252 is formed with a third hollow area 256 around a part of the second protrusion 252. The first protrusion 251 can move in the opposite direction of the pressing force when the first protrusion 251 is pressed by the first hollow area 254 and the second hollow area 255, and the second protrusion 252 can move in the opposite direction of the pressing force when the second protrusion 252 is pressed by the third hollow area 256.

[0072] Preferably, the first protrusion 251 is an arc-shaped protrusion outwardly protruding, and the second protrusion 252 is a protrusion in the shape of an inverted buckle, wherein the bottom end of the first protrusion 251 is lower than the bottom end of the second protrusion 252.

[0073] Further, the two side plates 22 are respectively recessed upward from the local area of the bottom end face thereof to form a first cable slot 224 and a second cable slot 225. The top of the first cable slot 224 and the top of the second cable slot 225 are respectively located above the bottom plate 25, so that the opening area a211 is in communication with the first cable slot 224, and the opening area b212 is in communication with the second cable slot 225. When the cable 6 is placed in the first cable slot 224 and the second cable slot 225, it is also placed in the protection measuring port 21, facilitating the measurement of the cable 6 by the measurement assembly 12.

[0074] Further, in the bottom end face of one of the side plates 22, a first sliding rail 222 is formed on the end face other than the first cable slot 224, and in the bottom end face of the other side plate 22, a second sliding rail 223 is formed on the end face other than the second cable slot 225. The first sliding rail 222 and the second sliding rail 223 are in the same plane, so that the moving plate 3 can move in the horizontal direction in the moving space.

[0075] In the present embodiment, when the shielding shell 4 is placed in the protection shell 2, a spacing area is formed between the shielding shell 4 and the protection shell 2, and a part of the flexible insulated cable shielding member 5 is placed in the spacing area, and the other part extends to the moving space through the shielding member perforation 253.

[0076] Further, the flexible insulated cable shielding member 5 includes a first part, a second part and a third part connected together, wherein the third part (i.e. the first part 51 and the second part 52) is clamped in the spacing area between the protection shell 2 and the shielding shell 4, the second part (i.e. the third part 54) extends in the direction of the bottom plate 25, and the first part (i.e. the fourth part 55) extends to the moving space after penetrating through the shielding member perforation 253.

[0077] The second part 52 is provided with a measuring port b 53 which is in communication with the measuring port a 41 and the protective measuring port 21, and the second part 52 is respectively arranged in the opening area a 211 and the opening area c 213.

[0078] When the cable is fixed by the moving plate in the first cable groove 224 and the second cable groove 225, the fourth part 55 and the second part 52 respectively wrap a part of the cable through the exposed parts of the opening area a 211 and the opening area c 213, forming a shielding structure.

[0079] Optionally, the first part 51 is connected with the inner wall surface of the protective shell 2, or connected with the outer wall surface of the shielding shell 4.

[0080] Preferably, the first part 51 is connected with the outer wall surface of the shielding shell 4, wherein the outer wall surface of the shielding shell 4 can be the front end surface of the shielding shell 4, or the bottom end surface of the shielding shell 4.

[0081] Further, the fourth part 55 is a free end, when the moving plate 3 moves to the clamping position, the fourth part 55 is located between the moving plate 3 and the bottom plate 25, wraps a part of the cable 6, and covers the protective measuring port 21. When the moving plate 3 is in the non-clamping position, a part of the fourth part 55 can be located outside the moving space.

[0082] In the embodiment, the first sliding groove 31 matched with the first sliding rail 222 and the second sliding groove 32 matched with the second sliding rail 223 are formed on the side wall surface of the moving plate 3. The top end surface of the moving plate 3 includes the first step part 33, the second step part 34 and the third step part 35 arranged from bottom to top, wherein the first step part 33, the second step part 34 and the third step part 35 are arranged in a stepped structure, and the first sliding groove 31 and the second sliding groove 32 are located between the second step part 34 and the first step part 33.

[0083] Further, the first position clamping groove 36 matched with the first protrusion 251 is formed on the top end surface of the third step part 35, wherein when the first protrusion 251 is arranged inside the first position clamping groove 36, the moving plate 3 is in the first clamping position, and the front end surface of the moving plate 3 is in the same plane with the front end plate 23 of the protective shell 2. At this time, the second step part 34 faces the protective measuring port 21, and the fourth part 55 is arranged above the second step part 34 and the first step part 33.

[0084] 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.

[0085] 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 .

[0086] 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.

[0087] In this embodiment, the cable 6 is placed inside the first cable groove 224, the protective measuring port 21, and the second cable groove 225. When the movable plate 3 is pushed to the first engaging position, the first step 33, the second step 34, and the third step 35 respectively contact the fourth portion 55, so that the fourth portion 55 wraps a portion of the cable 6 and covers the outside of the protective measuring port 21. When the movable plate 3 is fixed in the first engaging position, the fourth portion 55 is fixed in the moving space.

[0088] Example 2

[0089] like Figures 11 to 14 As shown, this embodiment provides a non-invasive monitoring device for cables. The difference between this embodiment and the first embodiment is that:

[0090] 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.

[0091] 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.

[0092] 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.

[0093] Example 3

[0094] like Figure 17 As shown, this embodiment provides a hard pressure plate voltage monitoring system, including a collector 9 and multiple non-invasive voltage monitoring devices 7 in Example 1. 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 voltage monitoring device 7 through a shielded wire 8. The non-invasive voltage 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 according to 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.

[0095] 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.

[0096] 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.

[0097] Embodiment Four

[0098] As Figure 18 shown, the embodiment provides an operation method for operating the non-intrusive voltage monitoring device in Embodiment One or Embodiment Two, comprising the following steps:

[0099] S101, the cable is placed in the first cable slot and the second cable slot, and the moving plate is moved to the desired clamping position, so that the first part of the flexible insulating cable shield is located between the moving plate and the bottom plate, wraps a part of the cable, and covers the protection measuring port.

[0100] Specifically, the cable is placed in the first cable slot and the second cable slot, and the moving plate is pushed to be in the first clamping position or the second clamping position by the cooperation of the first protrusion and the first position clamping groove or the first protrusion and the second position clamping groove, so that the flexible insulating cable shield can wrap a part of the cable and cover the protection measuring port.

[0101] S102, obtaining a voltage data set of the hard press plate in a preset time period.

[0102] Specifically, the voltage of the cable at the outlet of the hard press plate can be detected by the non-intrusive voltage monitoring device, and then the data measured by the non-intrusive voltage monitoring device is sent to the collector, and the collector obtains the voltage data measured by the non-intrusive voltage monitoring device. The voltage data in the recent period of time is obtained to form a voltage data set, for example, the preset time period is ten minutes, and the voltage data obtained at the current time and the previous ten minutes is obtained to form a voltage data set.

[0103] The preset time period is determined by the following method:

[0104] Obtain the recession change waveform graph of the voltage monitored by the hard press plate under different environments. The recession change waveform graph refers to the voltage change of the hard press plate. In a specific embodiment, the horizontal axis of the recession change waveform graph is time, and the vertical axis is the voltage of the hard press plate. It should be understood that the voltage change of the hard press plate is different under different environments. Different environments mean that at least one of the humidity, air pressure and other factors of the two environments is different. At the same time, the voltage change is also different when the wire material of the hard press plate is different. In a specific embodiment, two recession change waveform graphs are obtained, and the humidity of the environment where the two recession change waveform graphs are located is different, and the two graphs are respectively referred to as a first waveform graph and a second waveform graph. According to the recession change waveform graph, the decay time under different environments is calculated. The decay time refers to the time taken for the voltage of the hard press plate to drop to a specified value when the hard press plate is switched from the input state to the output 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 taken as the preset time period.

[0105] S103, calculating the difference between the maximum value and the minimum value in the voltage data set.

[0106] S104, determining the on-off state of the hard press plate according to the difference.

[0107] When the difference is greater than the difference preset value, the on-off state of the hard press plate is switched, for example, when the difference is greater than the difference preset value, the state of the hard press plate changes from the on state to the off state. For another example, when the difference is greater than the difference preset value, the state of the hard press plate changes from the off state to the on state.

[0108] In a specific embodiment, taking the case that the DC voltage is 110V when the hard press plate is in the on state as an example, referring to Figure 19 , including the off state s0 of the hard press plate, in the off state, the voltage is always 0V; when the hard press plate is in the on state, the voltage value Uo output by the hard press plate voltage monitoring device 10 rises in a short time and stabilizes at 110V, corresponding to the s1 part; when the hard press plate is off or disconnected due to unreliable connection, the voltage waveform changes to the slow decay discharge process of the suspended metal body, corresponding to the s2 part. Set the decay change value Δy as the difference between the stable voltage 110V and 10% of the stable voltage 110V, that is, Δy = 110V - 110V x 10%, under two different humidity conditions, record the decay time Δt experienced when the difference between Uo and the measured DC voltage value 110V is greater than Δy, which are Δt1 and Δt2 respectively.

[0109] Because the environment changes, the decay time Δt will be very different. Referring to Figure 19 , set the time threshold ΔT, that is, the preset time period, with the larger decay time Δt, the output voltage value Uo of the monitoring device is always stable at about 110V, and it is considered that the state of the hard press plate is on. However, due to changes in the external environment, Uo jumps at ΔT, and within ΔT, if the maximum change of Uo is less than Δy, it is considered that the state of the hard press plate does not change, and if the maximum change of Uo is not less than Δy, it is considered that the state of the hard press plate has changed. Δy is the difference preset value.

[0110] The above is only a preferred embodiment of the present application, which is only illustrative but not limiting. Those skilled in the art understand that many changes, modifications and even equivalents can be made within the spirit and scope of the present application as defined in the claims, but all will fall within the protection scope of the present application.

Claims

1. A non-invasive voltage monitoring device, comprising a protective shell, a movable plate, a shielding shell, a 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 relative to the top end surface to form a bottom plate, and a movable space for horizontal movement of the movable plate, a protective measuring port corresponding to the measuring port a is formed on the bottom plate, and a first cable trough and a second cable trough corresponding to and respectively connected to the protective measuring port are formed on the sidewall surface of the movable space, characterized in that: The cable shield is a flexible insulating cable shield, and the flexible cable shield includes a first portion that passes through the bottom plate and is located in the moving space, wherein: When the movable plate is in the engaged position, the first portion is deformed to wrap a portion of the cable and cover the protective measuring port.

2. The non-intrusive voltage monitoring device according to claim 1, characterized in that: When the movable plate is in the non-engaging position, a portion of the first portion is located outside the movable space.

3. The non-invasive voltage monitoring device according to claim 1 or 2, characterized in that: The flexible cable shield further includes a third portion sandwiched between the protective shell and the shielding shell, and a second portion extending toward the bottom plate, wherein the first portion, the second portion, and the third portion are connected, wherein: A measurement port b communicating with the measurement port a and the protection measurement port is formed on the third portion.

4. The non-intrusive voltage monitoring device according to claim 3, characterized in that: The third portion is connected to the inner wall surface of the protection shell, or connected to the outer wall surface of the shielding shell.

5. The non-intrusive voltage monitoring device according to claim 4, characterized in that: The base plate also includes a shielding hole for the first part to pass through, and a first protrusion and a second protrusion located in sequence on the rear side of the shielding hole, wherein the position of the shielding hole is adjacent to the position of the protection measuring port, and the shielding hole, the first protrusion and the second protrusion are on the same axis.

6. The non-intrusive voltage 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-intrusive voltage 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. The non-intrusive voltage monitoring device according to claim 7, characterized in that: The first matching structure includes a first groove and a first baffle arranged in a front-to-rear manner, wherein the top end surface of the first baffle is an inclined surface; The second matching structure includes a second baffle and a second groove arranged in front and back, wherein the top end surface of the second baffle is a plane, and when the bottom end of the second protrusion contacts the second baffle, the position of the movable plate is restricted.

9. A monitoring system, characterized in that: A device comprising a plurality of non-invasive voltage monitoring devices according to any one of claims 1 to 8, and a collector, wherein the collector is connected to the non-invasive voltage monitoring devices via a shielded wire; The non-invasive voltage 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 flexible 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 dataset 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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