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

Abstract

The application provides a non-invasive voltage monitoring device, a monitoring system and a monitoring method, wherein a measuring assembly and a shielding shell are sequentially arranged in the interior of a protective shell, a measuring opening a is formed on the bottom end face of the shielding shell, the bottom end face of the protective shell is recessed to form a bottom plate and a moving space for a moving plate, a protective measuring opening corresponding to the measuring opening a is formed on the bottom plate, a first cable slot and a second cable slot corresponding to the protective measuring opening and respectively communicating with the protective measuring opening are formed on the side wall face of the moving space, the cable shielding member is a flexible insulated cable shielding member, the first part of the cable shielding member is located in the moving space after penetrating through the bottom plate, when the moving plate is in the clamping position, the first part is deformed to wrap a part of the cable and cover the protective measuring opening. The application can ensure that no instantaneous incremental electric signal is generated when the non-invasive voltage monitoring device contacts the metal terminal in the hard pressure plate, and the safety hazard is eliminated.

Description

Technical Field

[0001] This application relates to the technical field of power grid hard plate condition detection, and in particular to a non-invasive voltage monitoring device, monitoring system and monitoring method. Background Technology

[0002] With the development of smart grids, the automation level of substations has greatly improved the efficiency and safety of power grid operation. As a secondary equipment operating mechanism, the hard switchboard is the hub connecting distribution network protection and automation devices to the outside world. Therefore, the enabled / disabled state of the hard switchboard is an artificially created break point in the protection tripping circuit. This break point directly affects whether the protection function and action output can function normally, providing assurance for maintenance and power safety. The hard switchboard is used to enable or disable corresponding protection functions, and the management of the hard switchboard of relay protection devices requires designated personnel. In the operation of smart grids, when the state of the hard switchboard changes, causing relay protection devices to fail to operate or malfunction, it will seriously affect the safe and reliable operation of power equipment.

[0003] According to the requirements of substation operation regulations, before the hardened voltage plate is put into operation, the voltage between the two ends of the hardened voltage plate and ground needs to be measured to prevent the relay protection device from failing to operate or malfunctioning. Currently, traditional voltage measurement is done manually, usually using a multimeter. This is prone to errors in multimeter range setting, which can lead to the control circuit being open and causing a tripping accident.

[0004] like Figure 1 As shown, the invention patent with publication number CN118884021A discloses a hard plate voltage monitoring device, assembly method and system with a shielded cavity. It can convert the sensed electric field strength of the cable into a voltage signal, and realize non-invasive monitoring of the DC voltage of the cable at a fixed distance. It includes an insulating protective shell (i.e., a protective cover and a protective housing), a shielded housing (i.e., a shielded cover and a shielded body), a moving plate and a measuring component 12. The measuring component 12 and the shielded housing are placed inside the protective housing in sequence. The protective housing includes a protective measuring port opened on its bottom end face, and a cable shield fixed on the protective measuring port and connected to the shielded body. A moving plate shield 14 is installed on the moving plate. When the moving plate moves to a position below the protective measuring port, the cable shield and the moving plate shield 14 contact to form a shielded cavity. However, since both the cable shield 13 and the movable plate shield 14 are made of metal, if the position of the hard plate voltage monitoring device moves, causing the cable shield 13 or the movable plate shield 14 to come into contact with the metal terminals in the hard plate, an instantaneous incremental electrical signal will be generated, causing the hard plate cabinet to make incorrect operations based on the incremental electrical signal, affecting the normal power supply of the power system.

[0005] Therefore, how to prevent the generation of instantaneous incremental electrical signals after the voltage monitoring device of the hard plate comes into contact with the metal terminals in the hard plate is an urgent problem to be solved. Summary of the Invention

[0006] To address the shortcomings mentioned above, this invention provides a non-invasive voltage monitoring device, monitoring system, and monitoring method that ensures no instantaneous incremental electrical signal is generated when the voltage monitoring device of the hard plate comes into contact with the metal terminals in the hard plate.

[0007] To achieve the above objectives, in a first aspect, the present invention provides a non-invasive voltage monitoring device, comprising a protective housing, a movable plate, a shielding housing, a cable shield, and a measuring component. The measuring component and the shielding housing are sequentially placed inside the protective housing. A measuring port a is provided on the bottom end face of the shielding housing. The bottom end face of the protective housing is recessed from the top end face to form a base plate and a moving space for the movable plate to move horizontally. A protective measuring port corresponding to the measuring port a is formed on the base plate. A first cable groove and a second cable groove corresponding to and respectively communicating with the protective measuring port are formed on the side wall of the moving space. The cable shield is a flexible insulated cable shield, which includes a first portion that penetrates the base plate and is located in the moving space, wherein:

[0008] When the movable plate is in the engaged position, the first part deforms and wraps around a portion of the cable, and covers the protective measuring port.

[0009] In one embodiment, when the movable plate is in the non-engaged position, a portion of the first part is located outside the movable space.

[0010] In one embodiment, the flexible insulated cable shield further includes a third portion sandwiched between the protective housing and the shield housing, and a second portion extending toward the base plate, wherein the first portion, the second portion, and the third portion are connected, wherein:

[0011] A measuring port b, which communicates with the measuring port a and the protective measuring port, is formed on the third part.

[0012] In one embodiment, the third portion is connected to the inner wall of the protective housing or to the outer wall of the shielding housing.

[0013] In one embodiment, the base plate further includes a through hole for the first portion to pass through the shield, and a first protrusion and a second protrusion located sequentially on the rear side of the through hole, wherein the position of the through hole is adjacent to the position of the protective measuring port, and the through hole, the first protrusion and the second protrusion are on the same axis.

[0014] In one embodiment, the movable plate includes a first step portion, a second step portion, and a third step portion arranged in a stepped manner from bottom to top. A first position groove and a second position groove are formed on the third step portion to mate with the first protrusion, wherein:

[0015] When the first protrusion engages with the first position slot, the movable plate is in the first engaged position, the second stepped portion faces the protective measuring port, and the front end face of the first stepped portion is on the same plane as the front end plate of the protective housing;

[0016] When the first protrusion engages with the second position slot, the movable plate is in the second engaged position, at least a portion of the third step faces the protective measuring port, and the front end face of the first step protrudes from the front end plate of the protective housing.

[0017] In one embodiment, a first mating structure and a second mating structure that cooperate 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, it restricts the position of the movable plate. The first mating structure, the first position slot, the second position slot, and the second mating structure are on the same axis.

[0018] In one embodiment, the first mating structure includes a first groove and a first baffle arranged in a front-to-back manner, wherein the top end face of the first baffle is an inclined surface;

[0019] The second mating structure includes a second baffle and a second groove arranged in a front-to-back manner. The top end face of the second baffle is flat, and when the bottom end of the second protrusion contacts the second baffle, it restricts the position of the movable plate.

[0020] Secondly, the present invention also provides a monitoring system, including the above-mentioned non-invasive voltage monitoring device and a data acquisition unit, wherein the data acquisition unit is connected to each of the non-invasive voltage monitoring devices via a shielded wire.

[0021] The non-invasive voltage monitoring device is used to output an analog voltage signal for the cable;

[0022] The data acquisition device is used to obtain the engagement / disengagement status of the hard plate based on the voltage analog signal.

[0023] Thirdly, the present invention also provides a monitoring method for implementing the above-described monitoring system, comprising the following steps:

[0024] The cable is placed in the first cable groove and the second cable groove. The moving plate moves to the required engagement position, so that the first part of the flexible insulated cable shield is located between the moving plate and the base plate, wrapping a part of the cable and covering and protecting the measurement port.

[0025] Obtain the voltage dataset of the hard platen within a preset time period;

[0026] Calculate the difference between the maximum and minimum values ​​in the voltage dataset;

[0027] The engagement / disengagement status of the hard pressure plate is determined based on the difference.

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

[0029] By replacing the existing metal shield with a flexible insulated cable shield, the flexible insulated cable shield can cover part of the cable and the cable measurement port while the moving plate is being pushed. This not only provides a shielding effect but also prevents the non-intrusive voltage monitoring device from generating an instantaneous incremental electrical signal when it comes into contact with the metal terminals in the hard plate, thus eliminating safety hazards.

[0030] With the same wire diameter, the spacing between the cable and the measuring component can be set by adjusting the engagement position of the moving plate to obtain electrical signals of different accuracies. In addition, since the engagement position of the moving plate can be adjusted, the non-invasive voltage monitoring sensor can be fitted with cables of different wire diameters according to actual needs, thereby increasing the applicability of the non-invasive voltage monitoring device.

[0031] By adding a matching first protrusion, a first position slot, and a second position slot, it is easier to fix the moving plate in the current engagement position, thereby increasing the cable clamping performance. Attached Figure Description

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

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

[0034] Figure 3 This is a structural diagram of the non-invasive voltage monitoring device after removing the moving plate in this embodiment;

[0035] Figure 4 This is a structural diagram of the movable plate in this embodiment;

[0036] Figure 5 This is a perspective view of the non-invasive voltage monitoring device in the first engaged state in this embodiment;

[0037] Figure 6 for Figure 5 A sectional view;

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

[0039] Figure 8 for Figure 5 A diagram showing the connection between the non-intrusive voltage monitoring device and the cable when the device is in the first engaged state.

[0040] Figure 9 for Figure 8 A sectional view;

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

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

[0043] Figure 12 for Figure 11 A sectional view;

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

[0045] Figure 14 for Figure 11 A diagram showing the connection between the non-intrusive voltage monitoring device and the cable when the device is in the second engaged state.

[0046] Figure 15 This is a cross-sectional view of the non-intrusive voltage monitoring device in an unengaged state.

[0047] Figure 16 for Figure 15 Enlarged view of section D;

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

[0049] Figure 18 This is a 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-Protective top cover; 101-Snap-on protrusion; 2-Protective housing; 21-Protective measuring port; 211-Opening area a; 212-Opening area b; 213-Opening area c; 22-Side plate; 221-Snap-on fixing port; 222-First slide rail; 223-Second slide rail; 224-First cable channel; 225-Second cable channel; 23-Front end plate; 24-Rear end plate; 25-Bottom plate; 251-First protrusion; 252-Second protrusion; 253-Shielding perforation; 254-First hollow area; 255-Second hollow area; 256-Third hollow area; 3-Moving plate; 31-First slide groove; 32-Second slide groove; 33- 34-First step; 35-Second step; 36-Third step; 37-First position slot; 38-Second position slot; 39-First groove; 30-Second groove; 310-First baffle; 311-Second baffle; 4-Shielding housing; 41-Front groove; 42-Measuring port a; 5-Flexible insulated cable shield; 51-First part; 52-Second part; 53-Measuring port b; 54-Third part; 55-Fourth part; 6-Cable; 7-Non-invasive voltage monitoring device; 8-Shielded wire; 9-Data collector; 10-Communication connector; 11-Probe connection connector; 12-Measuring component; 13-Cable shield; 14-Moving board shield. Detailed Implementation

[0053] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0054] In the description of this invention, it should be understood that the terms "upper," "lower," "top surface," "bottom surface," and "inner," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the 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 component positioned centrally. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Example 1

[0055] like Figures 2 to 10As shown, this embodiment provides a non-invasive voltage monitoring device, including a protective cover 1, a protective housing 2, a movable plate 3, a shielding housing 4, a flexible insulated cable shielding component 5, and a measuring component 12. The protective cover 1 and the protective housing 2 cooperate to form an insulating protective housing. The measuring component 12 is placed inside the shielding housing 4 and is grounded to the shielding housing 4. The insulating protective housing is sleeved on the outside of the shielding housing 4 to protect the shielding housing 4. Corresponding cable measuring holes (i.e., corresponding protective measuring ports 21, measuring ports a41, and measuring ports b53) are formed on the protective housing 2, the flexible insulated cable shielding component 5, and the shielding housing 4. When a cable 6 with a hard plate outlet is provided in the cable measuring hole, the voltage of the hard plate can be obtained by the measuring component 12 based on the electric field generated by the cable 6.

[0056] The protective cover 1, protective housing 2, and movable plate 3 can be made of nylon, ABS plastic, ASA plastic, or other insulating materials to protect the shield housing 4 and also prevent accidental contact with electricity when using the cable 6 at the hard pressure plate outlet for voltage measurement, thus ensuring the safe use of the non-invasive voltage monitoring device.

[0057] The shielding housing 4 can be made of metal. When the shielding housing 4 is grounded and connected to the measuring component 12, the shielding housing 4 can shield the interference signals of the external environment, making the measuring component 12 more accurate in measuring the cable 6.

[0058] The measuring component 12 can employ a vibration capacitive electric field sensor, a rotating blade electric field sensor, a piezoelectric thin film electric field sensor, a micro-electro-mechanical system (MEMS) electric field sensor, or a direct induction electric field sensor, etc., capable of measuring the voltage through the electric field of the cable 6. The sensing end of the measuring component 12 corresponds to the measuring hole in the cable.

[0059] The flexible insulated cable shield 5 is made of FPC material with a certain degree of elasticity, or other elastic insulating shielding materials. A shielding film is wrapped around the outside of the FPC material, giving it shielding and insulating properties. When the flexible insulated cable shield 5 wraps around the cable 6, it provides shielding. Furthermore, when the flexible insulated cable shield 5 comes into contact with the metal terminals in the rigid pressure plate, it does not generate instantaneous incremental electrical signals, thus eliminating safety hazards.

[0060] In this embodiment, specifically, the protective housing 2 is a rectangular housing with an open top. A protective measuring port 21 is provided on the bottom end face 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 face of the protective housing 2 and can be positioned on the bottom end face of the protective housing 2. When the movable plate 3 moves to the engaging position (i.e., the first engaging position or the second engaging position), it is located at the lower end of the protective measuring port 21, so that a part of the flexible insulated cable shield 5 blocks the protective measuring port 21 and a part of the cable 6.

[0061] Furthermore, a buckle protrusion 101 is provided on the protective cover 1, and buckle fixing holes 221 are provided on the side plates 22 of the protective housing 2, which are in the same position as the buckle protrusion 101 and cooperate with it. A shielding wire through hole is also provided on the rear plate 24 of the protective housing 2.

[0062] Furthermore, the protective housing 2 includes a front end plate 23, a side plate 22, a rear end plate 24, and a bottom plate 25. The bottom end of the protective housing 2 is recessed from the top end to form the bottom plate 25 and a moving space for the movable plate 3 to move horizontally. The bottom plate 25 has, from front to back, a protective measuring port 21, a shielding perforation 253, a first protrusion 251, and a second protrusion 252. The center points of the protective measuring port 21, the shielding perforation 253, the first protrusion 251, and the second protrusion 252 are all on the same axis.

[0063] Since the location of the perforation 253 of the shield is close to the location of the protective measuring port 21, it is convenient for a part of the flexible insulated cable shield 5 to cover the protective measuring port 21.

[0064] Preferably, the shielding perforation 253 is a horn-shaped structure with a larger opening at the top and a smaller opening at the bottom, with the larger opening at the top facing the interior of the protective housing 2 and the smaller opening at the bottom facing the moving space. This design makes it easy for the flexible insulated cable shielding 5 to pass through the shielding perforation 253.

[0065] Furthermore, the protective measuring port 21 includes an opening region a211, an opening region b212, and an opening region c213 connected in sequence.

[0066] 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 around a portion of the second protrusion 252. The first hollow area 254 and the second hollow area 255 allow the first protrusion 251 to move in the opposite direction to the compressive force when compressed, and the third hollow area 256 allows the second protrusion 252 to move in the opposite direction to the compressive force when compressed.

[0067] 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.

[0068] Furthermore, the two side plates 22 are recessed upwards from local areas of their bottom end faces to form a first cable groove 224 and a second cable groove 225. The tops of the first cable groove 224 and the second cable groove 225 are respectively located above the base plate 25, such that opening area a211 communicates with the first cable groove 224, and opening area b212 communicates with the second cable groove 225. When the cable 6 is placed inside the first cable groove 224 and the second cable groove 225, it is also simultaneously placed in the protective measuring port 21, facilitating measurement of the cable 6 by the measuring component 12.

[0069] Furthermore, on the bottom end face of one of the side plates 22, a first slide rail 222 is formed on the end face other than the first cable groove 224, and on the bottom end face of the other side plate 22, a second slide rail 223 is formed on the end face other than the second cable groove 225. The first slide rail 222 and the second slide rail 223 are on the same plane, so that the movable plate 3 can move horizontally in the moving space.

[0070] In this embodiment, when the shielding shell 4 is placed inside the protective shell 2, a gap area is formed between the shielding shell 4 and the protective shell 2. A part of the flexible insulated cable shield 5 is placed in the gap area, and the other part extends into the moving space through the shield perforation 253.

[0071] Furthermore, the flexible insulated cable shield 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 sandwiched in the gap area between the protective housing 2 and the shield housing 4, the second part (i.e., the third part 54) extends toward the base plate 25, and the first part (i.e., the fourth part 55) extends into the moving space after passing through the shield perforation 253.

[0072] The second part 52 has a measuring port b53 that communicates with the measuring port a41 and the protective measuring port 21, and the second part 52 is respectively placed in the opening region a211 and the opening region c213.

[0073] When the cable is fixed in the first cable groove 224 and the second cable groove 225 by the movable plate, the fourth part 55 and the second part 52 respectively wrap a portion of the cable through the exposed portions of the opening area a211 and the opening area c213 to form a shielding structure.

[0074] Optionally, the first part 51 is connected to the inner wall of the protective housing 2 or to the outer wall of the shielding housing 4.

[0075] Preferably, the first part 51 is connected to the outer wall surface of the shielding housing 4, wherein the outer wall surface of the shielding housing 4 can be the front end surface of the shielding housing 4 or the bottom end surface of the shielding housing 4.

[0076] Furthermore, the fourth part 55 is a free end. When the moving plate 3 moves to the engaged position, the fourth part 55 is located between the moving plate 3 and the base plate 25, wrapping a portion of the cable 6 and covering and protecting the measuring port 21. When the moving plate 3 is in the non-engaged position, a portion of the fourth part 55 can be located outside the moving space.

[0077] In this embodiment, a first groove 31 that mates with the first slide rail 222 and a second groove 32 that mates with the second slide rail 223 are formed on the side wall of the movable plate 3. The top end face 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, wherein 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 groove 31 and the second groove 32 are located between the second step portion 34 and the first step portion 33.

[0078] Furthermore, a first position groove 36 is formed on the top end face of the third step portion 35 to mate with the first protrusion 251. When the first protrusion 251 is placed inside the first position groove 36, the moving plate 3 is in a first engaged position, and the front end face of the moving plate 3 is on the same plane as the front end plate 23 of the protective housing 2. At this time, 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.

[0079] Furthermore, the top end face 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 and the second baffle 311 cooperate to form a limiting structure for the movable plate 3. 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.

[0080] Preferably, the positions of the first groove 38, the first baffle 310, the second baffle 311, and the second groove 39 correspond to the positions of the second protrusion 252.

[0081] Since the top surface of the first baffle 310 is inclined, the second protrusion 252 can pass through the top surface of the third step 35, allowing the movable plate 3 to move forward and be placed in the moving space. Since the top surface of the second baffle 311 is parallel, when the movable plate 3 moves backward, the second protrusion 252 abuts against the second baffle 311, limiting the position of the movable plate 3 and preventing the movable plate 3 from detaching from the moving space during movement.

[0082] 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 moving plate 3 is pushed to the first engaging position, the first step portion 33, the second step portion 34, and the third step portion 35 respectively contact the fourth part 55, so that the fourth part 55 wraps around a portion of the cable 6 and covers the outside of the protective measuring port 21. When the moving plate 3 is fixed in the first engaging position, the fourth part 55 is fixed in the moving space. Example 2

[0083] like Figures 11 to 14 As shown, this embodiment provides a non-invasive cable monitoring device. The difference between this embodiment and Embodiment 1 is that:

[0084] A first position groove 36 and a second position groove 37 are formed on the top end face of the third step portion 35 to cooperate with the first protrusion 251, wherein the second position groove 37 is located behind the first position groove 36. When the first protrusion 251 is placed in the second position groove 37, the moving plate 3 is in the second engaging position, and the front end face of the moving plate 3 and a part of the first step portion 33 are both located on the front side of the front end plate 23 of the protective housing 2. The front end face of the second step portion 34 is adjacent to the inner wall surface of the moving space, or the front end face of the second step portion 34 abuts against the inner wall surface of the moving space. At this time, at least a part of the third step portion 35 faces the protective measuring port 21.

[0085] Furthermore, the second baffle 311 and the second groove 39 are located behind the first position slot 36 in sequence, and the second protrusion 252 cooperates with the second baffle 311 to form a limiting structure for the movable plate 3. 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.

[0086] Compared to Embodiment 1 and Embodiment 2, since the position of the second step 34 is lower than the position of the third step 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 is closer in Embodiment 2, and the accuracy of the obtained electrical signal is higher. Example 3

[0087] like Figure 17 As shown, this embodiment provides a hard platen voltage monitoring system, including a data acquisition unit 9 and multiple non-invasive voltage monitoring devices 7 as described in Embodiment 1. The data acquisition unit 9 includes at least one communication connector 10 and at least one probe connection connector 11. The probe connection connector 11 and the non-invasive voltage monitoring devices 7 of the data acquisition unit 9 are connected via shielded cables 8. The non-invasive voltage monitoring devices 7 are used to detect the voltage of the hard platen outlet cable and output an analog voltage signal of the cable 6 at the hard platen outlet; the data acquisition unit 9 is used to determine the hard platen's on / off status based on the analog voltage signal. The data acquisition unit 9 includes a microcontroller module and a probe interface module. The microcontroller module is electrically connected to the probe interface module, and the probe interface module is connected to the shielded cables 8. The probe interface module is used to amplify the analog voltage signal; the microcontroller module is used to convert the received analog voltage signal into a data signal (voltage data) based on the analog voltage signal sent by the probe interface module, and to determine the hard platen's on / off status based on the voltage data.

[0088] To ensure safe power supply, the data acquisition unit 9 also includes a power supply module and a power protection module. The power protection module is electrically connected to the power supply module, and the power supply module is electrically connected to the microcontroller module. The power protection module protects the microcontroller module and has functions such as isolation, short circuit protection, overvoltage protection, undervoltage protection, overcurrent protection, voltage regulation, and noise reduction. The power supply module provides power to the microcontroller module.

[0089] To ensure that connected devices do not affect the microcontroller module, the data acquisition unit also includes a serial communication module and a serial port protection module. The serial port protection module is electrically connected to the serial communication module, and the serial communication module is electrically connected to the microcontroller module. The serial port protection module protects the serial communication module from damage caused by voltage surges to both the serial communication module and the microcontroller module. The serial communication module is used to establish communication with other devices and can send the on / off status of the hard switchboard. Example 4

[0090] like Figure 18 As shown, this embodiment provides an operating method for operating the non-invasive voltage monitoring device in Embodiment 1 or Embodiment 2, including the following steps:

[0091] S101. The cable is placed in the first cable groove and the second cable groove. The moving plate moves to the required engagement position, so that the first part of the flexible insulated cable shield is located between the moving plate and the base plate, wrapping a part of the cable and covering the protective measuring port.

[0092] Specifically, the cable is placed in the first cable groove and the second cable groove. The moving plate is pushed, and through the cooperating first protrusion and the first position slot, or the first protrusion and the second position slot, the moving plate is placed in the first engagement position or the second engagement position. The flexible insulated cable shield can wrap a part of the cable and cover and protect the measurement port.

[0093] S102. Obtain the voltage dataset of the hard plate within a preset time period.

[0094] Specifically, a non-invasive voltage monitoring device can detect the voltage of the cable at the outlet of the hard plate. The data measured by the non-invasive voltage monitoring device is then sent to a data acquisition unit, which receives the voltage data measured by the non-invasive voltage monitoring device. Voltage data over a recent period are collected to form a voltage dataset. For example, if the preset time period is ten minutes, the voltage data from the current moment and the previous ten minutes are collected to form the voltage dataset.

[0095] The preset time period is determined in the following way:

[0096] The decay waveforms of the monitoring voltage of the hard pressure plate are obtained under different environments. These waveforms represent the voltage changes of the hard pressure plate. In one specific implementation, the horizontal axis of the decay waveform represents time, and the vertical axis represents the voltage of the hard pressure plate. It is important to understand that the voltage changes of the hard pressure plate differ under different environments. Different environments indicate that at least one factor, such as humidity or air pressure, is different. Furthermore, the voltage changes also differ depending on the material of the hard pressure plate's conductors. In one specific implementation, two decay waveforms are obtained, each from an environment with different humidity levels. These two waveforms are designated as the first waveform and the second waveform, respectively. Based on the decay waveforms, the decay time under different environments is calculated. 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 an active state to an active state. This specified value is set by the operator based on actual conditions. The maximum decay time under different environments is used as the preset time period.

[0097] S103. Calculate the difference between the maximum and minimum values ​​in the voltage dataset.

[0098] S104. Determine the engagement / disengagement status of the hard plate based on the difference.

[0099] When the difference exceeds a preset value, the hard pressure plate's engagement / disengagement state is switched. For example, if the hard pressure plate is currently in the engaged state, and the difference exceeds the preset value, the hard pressure plate's state changes from engaged to disengaged. Similarly, if the hard pressure plate is currently in the disengaged state, and the difference exceeds the preset value, the hard pressure plate's state changes from disengaged to engaged.

[0100] In one specific implementation, taking a DC voltage of 110V when the hard pressure plate is in the engaged state as an example, refer to... Figure 19 The voltage waveform includes the following parameters: S0 (hard plate out of service), where the voltage remains 0V; S1 (hard plate in service), where the voltage output Uo from the hard plate voltage monitoring device rises and stabilizes at 110V within a short time; and S2 (hard plate out of service) when the hard plate is disconnected due to unreliable connection, where the voltage waveform changes as a slow decaying discharge process of the suspended metal body. The decay change value Δy is set to the difference between the stable voltage 110V and 10% of the stable voltage 110V, i.e., Δy = 110V - 110V × 10%. Under two different humidity conditions, the decay time Δt for the difference between Uo and the measured DC voltage 110V to be greater than Δy is recorded as Δt1 and Δt2, respectively.

[0101] The decay time Δt can vary significantly depending on environmental changes. (Refer to...) Figure 19 A time threshold ΔT, i.e., a preset time period, is set with a relatively large decay time Δt. If the output voltage Uo of the monitoring device remains stable at around 110V, the hard platen is considered to be in operation. However, due to changes in the external environment, Uo may jump within ΔT. Within ΔT, if the maximum change in Uo is less than Δy, the state of the hard platen is considered unchanged; if the maximum change in Uo is not less than Δy, the state of the hard platen is considered to have changed. Δy is the preset difference value.

[0102] The above description is merely a preferred embodiment of the present invention and is illustrative rather than restrictive. Those skilled in the art will understand that many changes, modifications, and even equivalents can be made within the spirit and scope defined by the claims of the present invention, all of which will fall within the protection scope of the present invention.

Claims

1. A non-invasive voltage monitoring device, comprising a protective housing, a movable plate, a shielded housing, a cable shield, and a measuring component, wherein the measuring component and the shielded housing are sequentially disposed inside the protective housing, a measuring port a is provided on the bottom end face of the shielded housing, the bottom end face of the protective housing is recessed from the top end face to form a base plate and a moving space for the movable plate to move horizontally, a protective measuring port corresponding to the measuring port a is formed on the base plate, and a first cable groove and a second cable groove corresponding to and respectively communicating with the protective measuring port are formed on the side wall of the moving space, characterized in that, The cable shielding component is a flexible insulated cable shielding component, which includes a first portion located in the moving space after penetrating the base plate, wherein: When the movable plate is in the engaged position, the first part deforms and wraps around a portion of the cable, and covers the protective measuring port.

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

3. The non-invasive voltage monitoring device according to claim 1 or 2, characterized in that, The flexible insulated cable shielding further includes a third portion sandwiched between the protective housing and the shielding housing, and a second portion extending toward the base plate, wherein the first portion, the second portion, and the third portion are connected, wherein: A measuring port b, which communicates with the measuring port a and the protective measuring port, is formed on the third part.

4. The non-invasive voltage monitoring device according to claim 3, characterized in that, The third part is connected to the inner wall of the protective housing or to the outer wall of the shielding housing.

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

6. The non-invasive voltage monitoring device according to claim 5, characterized in that, 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. A first position groove and a second position groove are formed on the third step portion to mate with the first protrusion, wherein: When the first protrusion engages with the first position slot, the movable plate is in the first engaged position, the second stepped portion faces the protective measuring port, and the front end face of the first stepped portion is on the same plane as the front end plate of the protective housing; When the first protrusion engages with the second position slot, the movable plate is in the second engaged position, at least a portion of the third step faces the protective measuring port, and the front end face of the first step protrudes from the front end plate of the protective housing.

7. The non-invasive voltage monitoring device according to claim 6, characterized in that, On the top surface of the third step, a first mating structure and a second mating structure are formed to cooperate with the second protrusion. 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, it restricts the position of the moving plate. 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-invasive voltage monitoring device according to claim 7, characterized in that, The first mating structure includes a first groove and a first baffle arranged in a front-to-back manner, wherein the top end face of the first baffle is an inclined surface; The second mating structure includes a second baffle and a second groove arranged in a front-to-back manner. The top end face of the second baffle is flat, and when the bottom end of the second protrusion contacts the second baffle, it restricts the position of the movable plate.

9. A monitoring system, characterized in that, The device includes the non-invasive voltage monitoring device according to any one of claims 1 to 8, and a data acquisition unit, wherein the data acquisition unit is connected to the non-invasive voltage monitoring device via a shielded wire; The non-invasive voltage monitoring device is used to output an analog voltage signal for the cable; The data acquisition device is used to obtain the engagement / disengagement status of the hard plate based on the voltage analog signal.

10. A monitoring method, characterized in that, To implement the monitoring system of claim 9, the following steps are included: The cable is placed in the first cable groove and the second cable groove. The moving plate moves to the required engagement position, so that the first part of the flexible insulated cable shield is located between the moving plate and the base plate, wrapping a part of the cable and covering and protecting the measurement port. Obtain the voltage dataset of the hard platen within a preset time period; Calculate the difference between the maximum and minimum values ​​in the voltage dataset; The engagement / disengagement status of the hard pressure plate is determined based on the difference.

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