Non-contact voltage measuring device

Abstract

The utility model discloses a non-contact voltage measuring device, which relates to the technical field of electric power systems, and comprises an outer shell, two electric connecting pieces, a main PCB (printed circuit board), a capacitor polar plate and a power connection plate, and a magnetic adsorption fixing module arranged on the outer shell enables the device to be stably adsorbed on the surface of a panel of a screen cabinet. The main PCB, the capacitor plate and the power connection plate are all installed in the outer shell, the capacitor plate, the power connection plate and the main PCB are in a non-contact state, the capacitor plate is electrically connected with the main PCB, a first connection part of the electric connection piece is connected with the power connection plate, and a second connection part of the electric connection piece is used for being connected with a corresponding electrode column of the power pressing plate. The power connection plate is used for receiving a voltage signal from the electric connecting piece, the capacitance polar plate generates a corresponding electric signal by sensing the change of an electric field around the power connection plate, and the main PCB indirectly derives a voltage value of the power pressing plate based on the sensed electric signal. The device has the advantages of being convenient to disassemble and assemble and safe to use.

Description

Technical Field

[0001] This utility model relates to the field of power system technology, specifically to a non-contact voltage measuring device. Background Technology

[0002] Electrical circuit breakers are crucial components in substation protection circuits. They are typically installed in the output circuits or functional protection circuits of substation protection systems to perform opening and closing operations on power lines, thereby ensuring the safe operation of the substation system. Traditional electrical circuit breakers are generally placed inside the panel of the protection cabinet, resulting in a complex wiring layout, and both electrode posts need to be connected to the protection line. However, these types of electrical circuit breakers do not have the function of measuring the voltage on the protection line.

[0003] Currently, while improved power supply circuit breakers with integrated voltage measurement functions have emerged in the market, they are only suitable for newly built substations. During the initial construction phase of a substation, these voltage-measuring power supply circuit breakers need to be pre-installed in the control cabinets. For substations requiring renovation, the existing power supply circuit breakers must be replaced, which often means dismantling the existing wiring, making construction more difficult.

[0004] To overcome the technical difficulties of installation, voltage measuring devices (CN221446186U) that can be installed later have appeared on the market. However, these voltage measuring devices still have the following problems:

[0005] 1. The devices are mostly fixed by adhesive, which poses a risk that the devices may fall off due to the degradation or aging of the adhesive over time.

[0006] 2. The PCB board inside the device is in direct contact with high voltage, which may not only cause the circuit board to burn out, but may also cause the pressure plate to be accidentally connected due to short circuit, thus causing safety hazards. Utility Model Content

[0007] In view of this, the present invention aims to provide a non-contact voltage measuring device, which aims to solve the difficulties faced by existing voltage measuring devices in the process of installation and modification, as well as the technical problems such as the risk of burnout and potential safety hazards caused by the direct exposure of the circuit board to a high voltage environment.

[0008] To achieve the above objectives, this utility model provides the following technical solution:

[0009] A non-contact voltage measuring device includes a housing, two electrical connectors, a main PCB board, capacitor plates, and a grounding plate. A magnetic adsorption fixing module on the housing allows the housing to be adsorbed and fixed onto a cabinet panel. The main PCB board, capacitor plates, and grounding plate are all installed inside the housing, and the capacitor plates, grounding plate, and main PCB board are in a non-contact state. The capacitor plates are electrically connected to the main PCB board. The first connecting part of the electrical connector is connected to the grounding plate, and the second connecting part of the electrical connector is used to connect to the corresponding electrode post of the power plate. The grounding plate is used to receive voltage signals from the electrical connectors. The capacitor plates sense changes in the electric field around the grounding plate and generate corresponding electrical signals accordingly. The main PCB board indirectly calculates the voltage value on the power plate through the electrical signals.

[0010] Furthermore, it also includes a probe holder, which is used to fix the anti-static tape to the main PCB board.

[0011] Furthermore, a grounding block with one end extending out of the outer casing is also provided inside the outer casing.

[0012] Furthermore, it also includes indicator lights mounted on the housing and connected to the main PCB board.

[0013] Furthermore, the outer shell is formed by assembling a front shell and a rear shell. The magnetic adsorption fixing module is set on the rear shell, and the main cavity of the rear shell is provided with insertion slots that correspond one-to-one with the main PCB board, capacitor plates and power connection board.

[0014] Furthermore, the rear shell also has two side cavities separated from the main cavity. Electrical connectors are installed in the corresponding side cavities. The second connecting part of the electrical connector is an elastic clamping end, and the first connecting part of the electrical connector is a contact head that fits against the contact plate. The contact force between the contact head and the contact plate remains stable.

[0015] Furthermore, the electrical connector also includes an elastic spiral portion that is sleeved and installed with a limiting post disposed in the side cavity. One end of the elastic spiral portion is connected to an elastic clamping end, and a first anti-rotation portion is connected between the contact head and the other end of the elastic spiral portion. The first anti-rotation portion cooperates with the corresponding limiting structure to prevent the contact head from rotating.

[0016] Furthermore, the contact head is connected to the first resistive part through the second resistive part, and the second resistive part cooperates with the corresponding limiting structure.

[0017] Furthermore, both the first and second damping parts have a U-shaped structure but bend in opposite directions, and the limiting structure is a protrusion that works in conjunction with the U-shaped bend.

[0018] As can be seen from the above technical solution, the advantages of this utility model are:

[0019] 1. The design of the magnetic adsorption fixing module makes the device easy to disassemble and assemble, and can be adapted to the upgrade and transformation needs of existing old power pressure plate equipment.

[0020] 2. In this utility model, voltage monitoring is performed in a non-contact manner using capacitor plates, a grounding plate, and a main PCB board. Physical gaps are used to isolate the grounding plate and the main PCB board, avoiding the defects of direct contact between the main PCB board and the grounding plate, which can easily lead to the main PCB board burning out, short circuits causing accidental connection of the power pressure plate. The current voltage value of the electrode post is indirectly calculated by using the change in the magnetic field of the capacitor plates. Attached Figure Description

[0021] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of this utility model. The illustrative embodiments of this utility model and their descriptions are used to explain this utility model and do not constitute an improper limitation of this utility model.

[0022] Figure 1 This is an exploded view of the structure of this utility model.

[0023] Figure 2 This is a cross-sectional schematic diagram of the present invention.

[0024] Figure 3 This is a schematic diagram of the front shell of this utility model.

[0025] Figure 4 This is a structural schematic diagram of the electrical connector of this utility model.

[0026] Figure 5 This is a schematic diagram of the structure of the rear shell of this utility model.

[0027] Figure 6 This is a schematic diagram of the grounding block of this utility model.

[0028] Figure 7 This is a schematic diagram of the probe holder of this utility model.

[0029] Explanation of reference numerals in the attached drawings: Front shell 110, capacitor plate 120, power supply plate 130, main PCB board 140, limiting groove 141, electrical connector 150, elastic clamping end 151, elastic spiral part 152, first rotating part 153, second rotating part 154, contact pressure head 155, rear shell 160, main cavity 161, side cavity 162, limiting plate 163, main board slot 164, plate slot 165, power supply plate slot 166, through groove 167, guide mounting groove 168, limiting post 169, partition 1610, protrusion 1620, grounding block 170, probe seat 180, magnetic adsorption fixing module 190, indicator light 1100. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the embodiments and accompanying drawings. Here, the illustrative embodiments and descriptions of this utility model are used to explain the present utility model, but are not intended to limit the present utility model.

[0031] This device can be applied to the intelligent transformation of old substations. In substations that have been in operation for many years, traditional power supply plates lack voltage monitoring capabilities, making it difficult to meet the operation and maintenance requirements of modern smart grids. This device can be directly attached to the metal panel of the existing protection cabinet via a magnetic adsorption module, without disassembling existing lines or damaging the cabinet structure. For example, in the renovation of a 220kV substation, technicians only need to attach the device to the area of ​​the power supply plate in the cabinet and use the elastic clamping end to hold the plate electrode post to complete the deployment, greatly reducing the complexity of construction.

[0032] This device can be used for temporary monitoring and emergency commissioning, in power system fault diagnosis or special testing scenarios where short-term monitoring of specific pressure plate voltage is required. The device supports rapid installation and removal: the magnetic adsorption design allows for quick fixation by a single person.

[0033] refer to Figures 1 to 7 ,like Figure 1 and Figure 2 As shown, this embodiment provides a non-contact voltage measuring device, including a housing, a main PCB board 140, a capacitor plate 120, and a grounding plate 130 all mounted within the housing, and two electrical connectors 150 mounted on the housing. A magnetic adsorption fixing module 190 is provided on the housing. Using the magnetic adsorption fixing module 190, the housing can be adsorbed and fixed onto the panel of the cabinet, giving this device convenient assembly and disassembly. It can be adapted and applied to the upgrading of existing old power pressure plates. Furthermore, compared to the adhesive method used in the prior art, the magnetic method is less prone to detachment after long-term use, making the voltage measuring device more secure. The measuring device has good installation stability. The capacitor plate 120, the receiving plate 130, and the main PCB board 140 are physically spaced apart and in a non-contact state. The capacitor plate 120 is electrically connected to the main PCB board 140. The first connecting part of the electrical connector 150 is electrically connected to the receiving plate 130. The second connecting part of the electrical connector 150 is used to connect to the corresponding electrode post of the power plate. The receiving plate 130 is used to receive the voltage signal from the electrical connector 150. The capacitor plate 120 senses the change in the electric field around the receiving plate 130 and generates a corresponding electrical signal accordingly. The main PCB board 140 indirectly calculates the voltage value at the power plate through the electrical signal.

[0034] This invention employs an innovative non-contact design, combining a capacitor plate 120, a grounding plate 130, and a main PCB board 140, to achieve precise monitoring of the voltage on the power plate. In this design, the capacitor plate 120 acts as a sensing element, sensitively detecting changes in the surrounding electromagnetic field; while the grounding plate 130 receives electrical signals from the power plate, preventing high-voltage signals from directly contacting the main PCB board.

[0035] Crucially, this invention cleverly utilizes a physical gap to effectively isolate the power supply board 130 from the main PCB board 140. This design not only significantly improves the safety of the device and effectively avoids serious problems such as burnout and short circuits of the main PCB board 140 that may be caused by direct contact, but also greatly reduces the potential safety hazards caused by accidental connection of the power supply board.

[0036] In actual operation, when the voltage on the power plate changes, this change is transmitted to the contact plate 130 through the electrical connector 150. The electromagnetic field around the contact plate 130 is then transmitted to the capacitor plates 120. Upon sensing the change in the magnetic field, the capacitor plates 120 convert it into a corresponding electrical signal. This signal is then transmitted to the main PCB board 140 for processing and analysis, ultimately determining the current voltage value of the electrode post through an internal calculation algorithm.

[0037] like Figure 1 and Figure 7 As shown, in this utility model, the non-contact voltage measuring device also includes a probe holder 180, which is used to fix the anti-static tape to the main PCB board 140.

[0038] Electrostatic discharge (ESD) is a common problem in the electronics industry, which can damage electronic components on PCBs. Antistatic tape has excellent antistatic properties, effectively preventing damage to the PCB and its electronic components from ESD. Connecting the antistatic tape to the main PCB 140 via probe holder 180 forms an ESD discharge channel, promptly dissipating any accumulated static charge on the main PCB 140, thus protecting the circuit and components. Simultaneously, it effectively reduces the impact of static electricity on the circuit, enhancing its stability and reliability. Furthermore, the probe holder 180 facilitates the replacement of the antistatic tape.

[0039] like Figure 1 and Figure 6As shown, in this utility model, a grounding block 170 with one end extending out of the outer casing is also provided inside the outer casing. The grounding block 170 can provide a stable grounding point, ensuring that the power plate can safely conduct charge to the ground during measurement, preventing electrostatic discharge (ESD) or other potential hazards caused by charge accumulation. At the same time, by using the grounding block 170, the voltage measuring device can also be electrically isolated from other parts of the power system, reducing interference and improving the accuracy of the measurement.

[0040] In this invention, the non-contact voltage measuring device also includes an indicator light 1100 mounted on the housing and connected to the main PCB board 140. The indicator light 1100 enables quick and accurate identification of the voltage fault plate among multiple voltage measuring devices, facilitating rapid elimination of danger.

[0041] like Figure 1 , Figure 2 , Figure 3 and Figure 5 As shown, to facilitate the assembly of the outer casing and internal components, the outer casing is composed of a front shell 110 and a rear shell 160. A magnetic adsorption fixing module 190 is configured on the rear shell 160, making the voltage measuring device easy to assemble and disassemble, reliable, and stable. Inside the main cavity 161 of the rear shell 160, plug-in slots are designed to match and install the main PCB board 140, capacitor plates 120, and connecting board 130. This plug-in installation method greatly simplifies the installation process of the main PCB board 140, capacitor plates 120, and connecting board 130, making it more convenient and efficient.

[0042] Specifically, motherboard slots 164, electrode plate slots 165, and power board slots 166 are arranged in an orderly manner on opposite sides of the main cavity 161, making the installation process more orderly and efficient, and also improving the rationality of the internal component layout. A limiting plate 163 is set at the central symmetrical position of the main cavity 161, with an electrode plate slot 165 and a power board slot 166 on each of its two sides. The main PCB board 140 is fixed by inserting into the two motherboard slots 164. In addition, the main PCB board 140 is designed with a limiting groove 141 that matches the limiting plate 163. This design forms a triangular support structure, which significantly enhances the stability of the main PCB board 140 and improves its shock resistance. On both sides of the limiting plate 163, a capacitor plate 120 and a power receiving plate 130 are respectively installed. The two sides of the capacitor plate 120 are inserted into the corresponding plate slots 165, and the two sides of the power receiving plate 130 are inserted into the corresponding power receiving plate slots 166. The capacitor plate 120 is located between the power receiving plate 130 and the main PCB board 140. This layout ensures that there are certain physical gaps between the capacitor plate 120 and the power supply board 130, as well as between the capacitor plate 120 and the main PCB board 140, effectively preventing direct contact between the power supply board 130 and the main PCB board 140, thereby reducing the risk of short circuits and burnout. The pressure from the front shell 110 ensures that the main PCB board 140, capacitor plate 120, and power supply board 130 are securely installed in their respective insertion slots. This plug-in installation greatly simplifies the installation process of the main PCB board 140, capacitor plate 120, and power supply board 130, and improves installation efficiency.

[0043] In this invention, the rear shell 160 also has two side cavities 162 separated from the main cavity 161. The side of the side cavity 162 has an L-shaped guide mounting groove 168 extending to the opening end face of the rear shell 160. The guide mounting groove 168 facilitates the assembly and disassembly of the electrical connector 150. The electrical connector 150 is installed in the corresponding side cavity 162. The second connecting part of the electrical connector 150 extends out from the guide mounting groove 168. The second connecting part of the electrical connector 150 is an elastic clamping end 151. The elastic clamping ends 151 of the two electrical connectors 150 have the elastic movement capability to move closer or further away from each other, so that the distance between the two elastic clamping ends 151 can be elastically adjusted. This feature allows the voltage measuring device to flexibly adapt to the spacing between different power plates (i.e., the distance between the two electrode posts on the power plate), thereby improving the versatility and applicability of the voltage measuring device. The first connecting part of the electrical connector 150 is a contact head 155 that fits against the junction plate 130. The use of the contact head 155 avoids the fixed connection between the electrical connector 150 and the junction plate 130, facilitating the replacement of the electrical connector 150. The contact force between the contact head 155 and the junction plate 130 is stable. Stable contact force ensures a good electrical connection between the contact head 155 and the junction plate 130, reducing signal attenuation or interruption caused by poor contact, thereby improving the overall performance and stability of the voltage measuring device. On the other hand, it can stabilize the contact area, which helps to reduce contact resistance and reduce energy loss and heat generation when current passes through. This is especially important for voltage measuring devices that operate for a long time, and can extend their service life. Furthermore, it prevents the junction plate 130 from deforming and affecting the distance between the junction plate 130 and the capacitor plate 120, making voltage monitoring reliable.

[0044] like Figure 1 and Figure 4 In this invention, the electrical connector 150 further includes an elastic spiral portion 152 that is hinged to a limiting post 169 disposed in the side cavity 162. One end of the elastic spiral portion 152 is connected to the elastic clamping end 151 to form a torsion spring structure, which has high durability and stability. Under normal use conditions, the torsion spring can maintain a certain spring force for a long time, has a long service life, and can reduce the replacement frequency of the electrical connector 150. A first anti-rotation portion 153 is connected between the contact head 155 and the other end of the elastic spiral portion 152. The first anti-rotation portion 153 cooperates with the corresponding limiting structure to prevent the contact head 155 from rotating with the elastic clamping end 151, so as to stabilize the contact force between the contact head 155 and the contact plate 130.

[0045] Furthermore, the contact head 155 is connected to the first resisting part 153 via the second resisting part 154, and the second resisting part 154 cooperates with the corresponding limiting structure. The double barrier of the first resisting part 153 and the second resisting part 154 prevents the elastic spiral part 152 from affecting the contact head 155 when it twists.

[0046] In this invention, both the first resistive rotating part 153 and the second resistive rotating part 154 have a U-shaped structure but with opposite bending directions. The limiting structure is a protrusion 1620 that works in conjunction with the U-shaped bend. The use of the limiting structure can restrict the drift of the first resistive rotating part 153 / second resistive rotating part 154 and reliably limit the other end of the elastic spiral part 152, so that the elastic spiral part 152 can effectively deform when subjected to hinge drive, so that the elastic clamping end 151 can reliably engage with the corresponding electrode post. The limiting of the first resistive rotating part 153 can also ensure the pressure applied by the contact pressure head 155 to the contact plate 130, making the contact reliable.

[0047] Specifically, a through groove 167 is provided on one end face of the partition 1610 located between the main cavity 161 and the side cavity 162 near the opening end for the contact pressure head 155 to pass through. The through groove 167 is used to limit the contact pressure head 155, which can reduce the impact of vibration on the contact pressure head 155, thereby forming triple isolation.

[0048] The usage and working principle of this application are as follows: the elastic clamping end 151 of the electrical connector 150 is snapped onto the upper and lower ends of the power pressure plate, and the collected electric field signal of the power pressure plate is transmitted to the receiving plate 130. There is a certain physical distance between the receiving plate 130 and the capacitor plate 120. When there is voltage at the upper and lower ends of the power pressure plate, the receiving plate 130 and the electrical connector 150 detect the change in the electric field of the power pressure plate, and thus transmit the electrical signal to the capacitor plate 120. The main PCB board 140 indirectly calculates the voltage value of the power pressure plate circuit by detecting the change in capacitance of the capacitor plate.

[0049] In this utility model, the main PCB board 140 includes a communication module and a voltage measurement module. The voltage measurement module is used to measure the voltage of the power pressure plate through two electrical connectors 150. The communication module can send voltage measurement information to the outside, which facilitates the intelligent operation of the power pressure plate for manual opening and closing in the substation and improves the intelligence level of the power pressure plate in old substations.

[0050] By connecting the aforementioned voltage measuring device to the power supply plate, on the one hand, the voltage of the power supply plate can be measured without relying on manual measurement with a multimeter, thus saving labor measurement costs; on the other hand, the connection between the voltage measuring device and the power supply plate does not require the removal of the original power supply plate, providing convenience for upgrading the voltage measurement method of the power system; in addition, this method also helps to improve the safety of the substation relay protection circuit, effectively avoiding substation safety accidents caused by misoperation such as accidental activation, missed activation, or partial activation of the power supply plate during inspection.

[0051] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. For those skilled in the art, various modifications and variations can be made to the embodiments of the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A non-contact voltage measuring device, comprising a housing, characterized in that, It also includes two electrical connectors (150), a main PCB board (140), capacitor plates (120), and a junction board (130). A magnetic adsorption fixing module (190) disposed on the outer casing allows the outer casing to be adsorbed and fixed on the cabinet panel. The main PCB board (140), capacitor plates (120), and junction board (130) are all installed inside the outer casing. The capacitor plates (120), the junction board (130), and the main PCB board (140) are in a non-contact state. The first connection portion of the electrical connector (150) is connected to the power receiving plate (130), the second connection portion of the electrical connector (150) is used to connect to the corresponding electrode post of the power plate, the power receiving plate (130) is used to receive the voltage signal from the electrical connector (150), the capacitor plate (120) senses the change in the electric field around the power receiving plate (130) and generates a corresponding electrical signal accordingly, and the main PCB board (140) indirectly calculates the voltage value on the power plate through the electrical signal.

2. The non-contact voltage measuring device according to claim 1, characterized in that, It also includes a probe holder (180) for fixing antistatic tape onto the main PCB board (140).

3. The non-contact voltage measuring device according to claim 1, characterized in that, The housing also includes a grounding block (170) with one end extending out of the housing.

4. The non-contact voltage measuring device according to claim 1, characterized in that, It also includes an indicator light (1100) mounted on the housing and connected to the main PCB board (140).

5. The non-contact voltage measuring device according to claim 1, characterized in that, The outer shell is formed by assembling a front shell (110) and a rear shell (160). The magnetic adsorption fixing module (190) is disposed on the rear shell (160). The main cavity (161) of the rear shell (160) is provided with insertion slots that correspond one-to-one with the main PCB board (140), capacitor plate (120) and power connection board (130).

6. The non-contact voltage measuring device according to claim 5, characterized in that, The rear shell (160) also has two side cavities (162) separated from the main cavity (161). The electrical connector (150) is installed in the corresponding side cavity (162). The second connection part of the electrical connector (150) is an elastic clamping end (151). The first connection part of the electrical connector (150) is a contact head (155) that fits against the power receiving plate (130). The contact head (155) fits stably against the power receiving plate (130).

7. The non-contact voltage measuring device according to claim 6, characterized in that, The electrical connector (150) further includes an elastic spiral part (152) that is sleeved and installed with a limiting post (169) disposed in the side cavity (162). One end of the elastic spiral part (152) is connected to the elastic clamping end (151). A first anti-rotation part (153) is connected between the contact head (155) and the other end of the elastic spiral part (152). The first anti-rotation part (153) cooperates with the corresponding limiting structure to prevent the contact head (155) from rotating.

8. The non-contact voltage measuring device according to claim 7, characterized in that, The contact head (155) is connected to the first resisting part (153) through the second resisting part (154), and the second resisting part (154) cooperates with the corresponding limiting structure.

9. The non-contact voltage measuring device according to claim 8, characterized in that, The first rotating part (153) and the second rotating part (154) are both U-shaped but with opposite bending directions. The limiting structure is a protrusion (1620) that works in conjunction with the U-shaped bend.

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