Non-contact dc voltage measurement device

Abstract

This application discloses a non-contact DC voltage measuring device, which includes a device housing, a main control circuit board and several acquisition modules housed within the housing. The main control circuit board includes several voltage measurement modules, and each voltage measurement module is electrically connected to a voltage acquisition module. Each voltage acquisition module includes a mounting bracket, a sensing electrode plate, and a sensing signal acquisition component. The first end of the mounting bracket is exposed on the surface of the device housing for mounting onto one of the electrode posts of the power plate. The sensing electrode plate is connected to the second end of the mounting bracket. The sensing signal acquisition component is at least partially aligned with the sensing electrode plate. The voltage measurement module is electrically connected to the sensing signal acquisition component of the corresponding voltage acquisition module. This technical solution avoids the safety issues of existing contact-type resistance voltage divider measuring devices and simultaneously possesses extremely high reliability and ensures the accuracy of the measurement results.

Description

Technical Field

[0001] This application relates to the field of power equipment measurement technology, and in particular to a non-contact DC voltage measuring device. Background Technology

[0002] Currently, most circuit breakers in domestic substations are manually operated. This requires maintenance personnel to be on-site to operate the circuit breakers, and the voltage of the circuit breaker must be measured before any operation can proceed. Existing technologies generally use contact-type resistance voltage divider measuring devices or non-contact inductive measuring devices for circuit breaker voltage measurement. Contact-type resistance voltage divider measuring devices are not only less reliable, but also require manual loosening of the nuts on the upper and lower terminals of the circuit breaker before connecting the measuring line, which can easily lead to circuit breaker malfunction or electric shock. Non-contact inductive measuring devices, which are typically clamped to the circuit breaker and measure voltage by inducing the electric field on the circuit, are easily affected by the wire material on the circuit breaker (i.e., different wire materials have very different electric field shielding effects), resulting in inaccurate measurement results. Utility Model Content

[0003] This application provides a non-contact DC voltage measuring device, which aims to improve the technical problems of existing pressure plate voltage measuring devices, such as low reliability, low safety, and inaccurate measurement results.

[0004] Therefore, this application provides a non-contact DC voltage measuring device applied to a power pressure plate installed at the rear end of a protective cabinet. The power pressure plate has two electrode posts, includes a device housing, a main control circuit board and several voltage acquisition modules housed within the device housing, the main control circuit board includes several voltage measurement modules, one of which is electrically connected to one of the voltage acquisition modules. The voltage acquisition module includes a mounting bracket, a sensing electrode plate, and a sensing signal acquisition component.

[0005] The mounting bracket includes a first end and a second end. The first end is exposed on the surface of the device housing for hanging on one of the electrode posts of the power plate. The second end passes through the device housing and is placed inside the device housing.

[0006] The sensing electrode plate is connected to the second end to be used to access the DC electric field on the electrode post;

[0007] The inductive signal acquisition component is at least partially facing the inductive electrode plate to inductively acquire the DC electric field on the inductive electrode plate in order to obtain the target induced voltage signal.

[0008] The voltage measurement module is electrically connected to the inductive signal acquisition component of the corresponding voltage acquisition module to measure the voltage at one end of the corresponding electrode post based on the target inductive voltage signal.

[0009] Optionally, in some embodiments of this application, the non-contact DC voltage measuring device includes two voltage acquisition modules, and the two voltage acquisition modules are spaced apart along a preset direction. The connectors of the two voltage acquisition modules are respectively connected to two electrode posts of the same power pressure plate. The preset direction is the arrangement direction of the two electrode posts of the corresponding power pressure plate.

[0010] The main control circuit board includes two voltage measurement modules, each of which is electrically connected to the sensing signal acquisition component of a voltage acquisition module.

[0011] Optionally, in some embodiments of this application, the sensing signal acquisition component includes a rotating blade, a rotating motor, a current sensor, and a voltage acquisition board. The current sensor is positioned opposite the sensing electrode plate, and the rotating blade is located in the gap between the current sensor and the sensing electrode plate, and is driven by the rotating motor to rotate periodically under the drive of the rotating motor. The voltage acquisition board is electrically connected to the current sensor to sample the voltage of the induced current generated by the current sensor to obtain the target induced voltage signal.

[0012] Optionally, in some embodiments of this application, the voltage acquisition board includes a small signal acquisition circuit module and an analog amplifier circuit module, wherein,

[0013] The small signal acquisition circuit module includes a sampling resistor, one end of which is electrically connected to the current sensing element, and the other end of which is grounded. The small signal acquisition circuit module is used to obtain a preset voltage sampling signal by acquiring the voltage across the sampling resistor.

[0014] The analog amplifier circuit module is used to perform preset signal amplification processing on the preset voltage sampling signal to obtain the target induced voltage signal.

[0015] Optionally, in some embodiments of this application, the voltage acquisition board further includes a signal comparison module, which is used to compare the waveform of the target induced voltage signal with a preset signal waveform to distinguish whether the target induced voltage signal is a positive voltage signal or a negative voltage signal.

[0016] Optionally, in some embodiments of this application, the hook is a spring hook.

[0017] Optionally, in some embodiments of this application, a grounding screw post is further included, the grounding screw post having a third end and a fourth end, the third end being exposed on the surface of the device housing for connecting to an adjacent grounding system, and the fourth end passing through the device housing and electrically connected to the grounding terminal of the main control circuit board.

[0018] Optionally, in some embodiments of this application, the device housing includes a front cover with a first groove and a rear cover with a second groove, the front cover and the rear cover being detachably connected, such that the first groove and the second groove together enclose and form a mounting cavity for accommodating the main control circuit board and at least one of the voltage acquisition modules.

[0019] Optionally, in some embodiments of this application, at least one mounting hole is provided on one side wall of the first groove, and all the mounting holes are provided adjacent to the bottom wall of the first groove, and the second end of each of the hooks passes through one of the mounting holes to pass through the device housing.

[0020] Optionally, in some embodiments of this application, a quick-release connector is provided on the side surface of the front cover of the device away from the rear cover of the device, for quick installation and removal of the non-contact DC voltage measuring device on the protective cabinet.

[0021] In the technical solution provided in this application, through the aforementioned structural design, when measuring the terminal voltage at any end of the power pressure plate, it is not necessary to intrude into the pressure plate circuit of the existing power pressure plate. Simply attach the corresponding voltage acquisition module's connector to the corresponding electrode post of the power pressure plate, and its DC electric field can be connected to the induction electrode plate of the corresponding voltage acquisition module. Then, through the cooperation of the induction signal acquisition component of the corresponding voltage acquisition module and the corresponding voltage measurement module on the main control circuit board, non-contact and accurate measurement of the terminal voltage at the corresponding end can be achieved. In this way, since the entire measurement process does not require intrusion into the pressure plate circuit of the existing power pressure plate, the safety issues of existing contact-type resistive voltage divider measurement devices are avoided. Furthermore, by connecting the DC electric field to be measured to the corresponding induction electrode plate through the connector and then performing the corresponding non-contact measurement, the entire measurement process has extremely high reliability and ensures the accuracy of the measurement results. Therefore, this technical solution can effectively improve the technical problems of low reliability, low safety, and inaccurate measurement results existing in current pressure plate voltage measurement devices. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the non-contact DC voltage measuring device in the embodiments of this application;

[0023] Figure 2 for Figure 1A schematic diagram of the disassembled structure of the non-contact DC voltage measuring device shown.

[0024] Figure 3 for Figure 1 The diagram shows the disassembled structure of the non-contact DC voltage measuring device in use.

[0025] Figure 4 for Figure 1 The diagram shows the induction principle model of the induction signal acquisition component of the non-contact DC voltage measurement device.

[0026] 1. Non-contact DC voltage measuring device; 100. Device housing; 110. Device front cover; 111. First slot; 112. Mounting hole; 120. Device rear cover; 121. Second slot; 130. Quick-connect connector; 131. Adhesive; 200. Main control circuit board; 300. Voltage acquisition module; 310. Hanger; 320. Induction electrode plate; 330. Induction signal acquisition component; 331. Rotating blade; 332. Rotating motor; 333. Current sensing element; 334. Voltage acquisition board; 2. Power pressure plate; 21. Electrode post. Detailed Implementation

[0027] The terms “first,” “second,” “third,” “fourth,” etc. (if present) in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments described herein can be implemented in a sequence other than that illustrated or described herein. Furthermore, the terms “comprising” or “having,” and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0028] In one embodiment, such as Figures 1 to 4As shown in the figure, this application provides a non-contact DC voltage measuring device 1. Specifically, the non-contact DC voltage measuring device 1 may include a device housing 100, a main control circuit board 200 disposed within the device housing, and several voltage acquisition modules 300. The main control circuit board 200 includes several voltage measurement modules (not shown). Each voltage measurement module is electrically connected to a voltage acquisition module 300. The voltage acquisition module 300 includes a mounting bracket 310, a sensing electrode plate 320, and a sensing signal acquisition component 330. The mounting bracket 310 includes a first end and a second end. The first end is exposed on the surface of the device housing 100 for mounting on one of the electrode posts 21 of the power pressure plate 2. The second end passes through the device housing 100 and is disposed within the device housing 100. The sensing electrode plate 320 is connected to the second end for accessing the DC electric field on the electrode post 21. The induction signal acquisition component 330 is at least partially aligned with the induction electrode plate 320 to inductively acquire the DC electric field on the induction electrode plate 320 to obtain the target induced voltage signal. The voltage measurement module is electrically connected to the induction signal acquisition component 330 of the corresponding voltage acquisition module 300 to measure the voltage at one end of the corresponding electrode post 21 based on the target induced voltage signal.

[0029] It is understood that the non-contact DC voltage measuring device 1 of this application embodiment is mainly applied to the power plate 2 on the substation protection circuit to realize the DC voltage measurement of the power plate 2. The power plate 2 is generally set at the rear end of the protection cabinet and usually has two terminals (i.e., two electrode posts 21) for connecting the control node of the relay protection circuit. The non-contact DC voltage measuring device 1 is also generally installed at the rear end of the protection cabinet and is hung on one electrode post 21 of the power plate 2 through at least one hanging piece 310 to realize the measurement of the terminal voltage of the corresponding end. The aforementioned hanging piece 310 is generally made of conductive material (such as copper, aluminum, etc.) so that it can be simply hung on the corresponding electrode post 21 to connect the DC electric field on the electrode post 21 to the corresponding induction electrode plate 320 without interfering with the pressure plate circuit of the corresponding power plate 2. The aforementioned induction electrode plate 320 is also generally made of conductive material (such as copper, aluminum, etc.) so that it can be well connected to the corresponding DC electric field. The aforementioned induction signal acquisition component 330 and voltage measurement module can specifically be the electric field induction measurement circuit used in existing non-contact measurement devices to achieve corresponding non-contact voltage measurement. The specific measurement method includes, but is not limited to, the following: first, the DC electric field on the induction electrode plate 320 is converted into an AC electric field; then, while sensing the change in the AC electric field through a sampling circuit with a sampling resistor, the AC electric field is restored to a DC voltage signal (i.e., the target induction voltage signal); finally, the terminal voltage corresponding to the previously measured electrode post is calculated and derived based on this DC voltage signal.

[0030] In addition, the main control circuit board 200 mentioned above generally includes a communication circuit module (specifically, an RS485 communication circuit module) to facilitate communication with some devices with display functions, so as to output and display the voltage data measured by the device.

[0031] In this way, the non-contact DC voltage measuring device 1 of this application embodiment, through the above-described structural configuration, can measure the terminal voltage at any end of the power pressure plate 2 without intruding into the existing pressure plate circuit of the power pressure plate 2. It only requires attaching the corresponding voltage acquisition module 300's connector 310 to the corresponding electrode post 21 of the power pressure plate 2, thus connecting its DC electric field to the induction electrode plate 320 of the corresponding voltage acquisition module 300. At this point, through the cooperation of the induction signal acquisition component 330 of the corresponding voltage acquisition module 300 and the corresponding voltage measurement module on the main control circuit board 200, a non-contact and accurate measurement of the terminal voltage at the corresponding end can be achieved. Therefore, since the entire measurement process does not require intrusion into the existing pressure plate circuit of the power pressure plate 2, the safety issues of existing contact-type resistance voltage divider measuring devices are avoided. Furthermore, by connecting the DC electric field to be measured to the corresponding induction electrode plate 320 through the connector 310 and then performing the corresponding non-contact measurement, the entire measurement process has extremely high reliability and ensures the accuracy of the measurement results.

[0032] In some examples, such as Figure 1 , Figure 2 and Figure 3 As shown, the non-contact DC voltage measuring device 1 includes two voltage acquisition modules 300, which are spaced apart along a preset direction. The mounting brackets 310 of the two voltage acquisition modules 300 are respectively mounted on two electrode posts 21 of the same power pressure plate 2. The main control circuit board 200 includes two voltage measurement modules, each of which is electrically connected to the sensing signal acquisition component 330 of one voltage acquisition module 300. It can be understood that in this example, the mounting brackets 310 of the two voltage acquisition modules 300 being respectively mounted on two electrode posts 21 of the same power pressure plate 2 specifically means that the mounting bracket 310 of one voltage acquisition module 300 is mounted on one electrode post 21 of the power pressure plate 2, and the mounting bracket 310 of the other voltage acquisition module 300 is mounted on the other electrode post 21 of the power pressure plate 2. Since one electrode post 21 of the same power plate 2 is the upper electrode post 21 of the corresponding power plate 2, the upper voltage of the corresponding power plate 2 can be measured; the other electrode post 21 is the lower electrode post 21 of the corresponding power plate 2, and the lower voltage of the corresponding power plate 2 can be measured. Thus, through the above structural arrangement, this non-contact DC voltage measuring device 1 can simultaneously measure both the upper and lower voltages of a single power plate 2, significantly improving its measurement efficiency.

[0033] In some examples, such as Figures 1 to 4As shown, the induction signal acquisition component 330 includes a rotating blade 331, a rotating motor 332, a current sensor 333, and a voltage acquisition board 334. The current sensor 333 is positioned directly opposite the induction electrode plate 320, and the rotating blade 331 is located in the gap between the current sensor 333 and the induction electrode plate 320, and is driven by the rotating motor 332 to rotate periodically. The voltage acquisition board 334 is electrically connected to the current sensor 333 to sample the voltage of the induced current generated by the current sensor 333 to obtain the target induced voltage signal. Thus, through the above structural setup, the induction signal acquisition component 330 in this example utilizes the electric field induction principle as follows: During operation, the circuit of the power pressure plate 2 generates a fixed electric potential field. This electric potential field is connected to the corresponding induction electrode plate 320 via the corresponding connector 310. Simultaneously, the rotary motor 332 drives the rotating blade 331 to rotate at a fixed frequency, causing the current sensing element 333 to be periodically exposed and shielded by this electric potential field (i.e., converting the DC electric field on the induction electrode plate 320 into an AC electric field). This generates a time-varying induced current Is(t) between the current sensing element 333 and the ground plane. The magnitude of this induced current Is(t) is proportional to the electric field strength E of the electric potential field. In physical terms:

[0034] Qs(t)=s0Eα(t);

[0035] Where Qs(t) is the induced charge on the current sensing element 333; ε0 is the vacuum permittivity; α(t) is the area of ​​the current sensing element 333 exposed to the potential field at time t;

[0036] The formula for calculating the induced current Is(t) is: From the above formula, it can be seen that the electric field strength E of the potential field is proportional to the induced charge Qs(t) and induced current Is(t) on the current sensing element 333. Therefore, the electric field strength E of the potential field can be calculated by measuring the voltage on the impedance (i.e., sampling resistor Z) between the induced charge Qs(t) and induced current Is(t) on the current sensing element 333 and the ground plane. Specifically, the voltage acquisition board 334 can place the sampling resistor Z between the current sensing element and the ground plane, first convert the generated induced current Is(t) into induced voltage Vs(t), and then perform certain signal processing to obtain the target induced voltage signal. Finally, the MCU of the corresponding voltage measurement module on the main control circuit board 200 can deduce the voltage value of the corresponding terminal voltage in reverse through the preset slope formula.

[0037] Understandably, to facilitate the operation of the rotary motor 332, a corresponding motor drive circuit is also provided on the main control circuit board 200 in this example. Furthermore, when this non-contact DC voltage measuring device 1 includes two voltage acquisition modules 300, the voltage acquisition boards 334 of the two voltage acquisition modules 300 in this example can be designed on the same circuit board. Additionally, the voltage acquisition board 334 in this example is electrically connected to the main control circuit board via symmetrical pins and sockets on both sides.

[0038] In some examples, such as Figures 1 to 4 As shown, the voltage acquisition board 334 includes a small signal acquisition circuit module (not shown) and an analog amplifier circuit module (not shown). The small signal acquisition circuit module includes a sampling resistor Z, one end of which is electrically connected to the current sensor 333, and the other end is grounded. The small signal acquisition circuit module is used to acquire the voltage across the sampling resistor Z to obtain a preset voltage sampling signal (i.e., the induced voltage Vs(t) mentioned above). The analog amplifier circuit module is used to amplify the preset voltage sampling signal to obtain the target induced voltage signal. Thus, with the above structural configuration, the voltage acquisition board 334 can effectively sample the induced current generated by the current sensor 333 to obtain the target induced voltage signal.

[0039] It is understandable that the small signal acquisition circuit module in this example can adopt a conventional voltage sampling circuit structure, which includes not only the sampling resistor Z, but also filters and other circuit structures that can remove unnecessary frequency interference. The analog amplifier circuit module in this example can specifically adopt a common analog amplifier circuit, mainly composed of operational amplifiers and other circuit structures, to amplify the weak, preset voltage sampling signal acquired by the circuit according to a preset ratio to obtain the target induced voltage signal.

[0040] In some examples, the voltage acquisition board 334 also includes a signal comparison module (not shown), which compares the waveform of the target induced voltage signal with a preset signal waveform to distinguish whether the target induced voltage signal is a positive or negative voltage signal. Thus, through the above structural configuration, the voltage acquisition board 334 can also determine the polarity of the target induced voltage signal, thereby enabling the measurement of the terminal voltage on each electrode post 21 of the power plate 2 while automatically identifying its polarity.

[0041] It is understandable that the signal comparison module in this example can adopt common signal comparison circuits, mainly including circuit structures such as differential amplifiers (or comparators).

[0042] In some examples, such as Figure 1 , Figure 2and Figure 3 As shown, the hook 310 is a spring hook. Thus, with the above structural arrangement, when this non-contact DC voltage measuring device 1 includes two voltage acquisition modules 300 for simultaneously measuring the terminal voltage on the two electrode posts 21 of the power plate 2, it is compatible with the measurement requirements of pressure plates with different spacings, without the need to develop multiple measuring devices for adaptation. This is because the hook 310 has a certain amount of elastic extension, allowing it to accommodate the simultaneous connection requirements of two electrode posts 21 with various spacings.

[0043] In some examples, such as Figure 1 , Figure 2 and Figure 3 As shown, the non-contact DC voltage measuring device 1 also includes a grounding screw post, which has a third end and a fourth end. The third end is exposed on the surface of the device housing 100 for connecting to an adjacent grounding system, and the fourth end passes through the device housing 100 and is electrically connected to the grounding terminal of the main control circuit board 200. Thus, through the above structural arrangement, the grounding of the main control circuit board 200 can be achieved, facilitating the discharge of interference signals generated by the main control circuit board 200 during the voltage measurement process into the ground through an adjacent grounding system, thereby further improving the measurement accuracy of the non-contact DC voltage measuring device 1.

[0044] In some examples, such as Figure 1 , Figure 2 and Figure 3 As shown, the device housing 100 includes a front cover 110 with a first groove 111 and a rear cover 120 with a second groove 121. The front cover 110 and the rear cover 120 are detachably connected, such that the first groove 111 and the second groove 121 together enclose a mounting cavity for accommodating the main control circuit board 200 and at least one voltage acquisition module 300. Thus, this structural arrangement facilitates the installation and maintenance of the internal components of this non-contact DC voltage measuring device 1.

[0045] It is understandable that the detachable connection in this example can be achieved primarily through screw or snap-fit ​​structures.

[0046] In some examples, such as Figure 1 , Figure 2 and Figure 3 As shown, at least one mounting hole 112 is provided on one side wall of the first groove 111, and all mounting holes 112 are located adjacent to the bottom wall of the first groove 111. The second end of each hanger 310 passes through a mounting hole 112 into the device housing 100. Thus, the above-mentioned structural arrangement facilitates the installation and maintenance of the hanger 310.

[0047] In some examples, such as Figure 1 , Figure 2 and Figure 3 As shown, a quick-connect connector 130 is protruding from the side of the front cover 110 away from the rear cover 120, for quick installation and removal of the non-contact DC voltage measuring device 1 on the protective cabinet. Thus, this structural design allows users to easily install or remove the non-contact DC voltage measuring device 1 according to their actual needs.

[0048] It is understood that the quick-connector 130 in this example can specifically be a connecting plate, which can be connected via... Figure 2 The adhesive 131 shown is applied to the chassis panel at the rear of the protective cabinet, or it can be quickly installed to the chassis panel at the rear of the protective cabinet using screws or clips.

[0049] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit it. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A non-contact DC voltage measuring device, applied to a power pressure plate installed at the rear end of a protective cabinet, the power pressure plate having two electrode posts, characterized in that, The device includes a housing, a main control circuit board housed within the housing, and several voltage acquisition modules. The main control circuit board includes several voltage measurement modules, each of which is electrically connected to a voltage acquisition module. Each voltage acquisition module includes a mounting bracket, a sensing electrode plate, and a sensing signal acquisition component. The mounting bracket includes a first end and a second end. The first end is exposed on the surface of the device housing for hanging on one of the electrode posts of the power plate. The second end passes through the device housing and is placed inside the device housing. The sensing electrode plate is connected to the second end to be used to access the DC electric field on the electrode post; The inductive signal acquisition component is at least partially facing the inductive electrode plate to inductively acquire the DC electric field on the inductive electrode plate in order to obtain the target induced voltage signal. The voltage measurement module is electrically connected to the inductive signal acquisition component of the corresponding voltage acquisition module to measure the voltage at one end of the corresponding electrode post based on the target inductive voltage signal.

2. The non-contact DC voltage measuring device according to claim 1, characterized in that, The non-contact DC voltage measuring device includes two voltage acquisition modules, which are spaced apart along a preset direction. The connectors of the two voltage acquisition modules are respectively attached to two electrode posts of the same power pressure plate. The preset direction is the arrangement direction of the two electrode posts of the corresponding power pressure plate. The main control circuit board includes two voltage measurement modules, each of which is electrically connected to the sensing signal acquisition component of a voltage acquisition module.

3. The non-contact DC voltage measuring device according to claim 1 or 2, characterized in that, The sensing signal acquisition component includes a rotating blade, a rotating motor, a current sensor, and a voltage acquisition board. The current sensor is positioned opposite the sensing electrode plate, and the rotating blade is located in the gap between the current sensor and the sensing electrode plate. It is driven by the rotating motor to rotate periodically under the drive of the rotating motor. The voltage acquisition board is electrically connected to the current sensor to sample the voltage of the induced current generated by the current sensor to obtain the target induced voltage signal.

4. The non-contact DC voltage measuring device according to claim 3, characterized in that, The voltage acquisition board includes a small signal acquisition circuit module and an analog amplifier circuit module, wherein... The small signal acquisition circuit module includes a sampling resistor, one end of which is electrically connected to the current sensing element, and the other end of which is grounded. The small signal acquisition circuit module is used to obtain a preset voltage sampling signal by acquiring the voltage across the sampling resistor. The analog amplifier circuit module is used to perform preset signal amplification processing on the preset voltage sampling signal to obtain the target induced voltage signal.

5. The non-contact DC voltage measuring device according to claim 4, characterized in that, The voltage acquisition board also includes a signal comparison module, which is used to compare the waveform of the target induced voltage signal with a preset signal waveform to distinguish whether the target induced voltage signal is a positive voltage signal or a negative voltage signal.

6. The non-contact DC voltage measuring device according to claim 1 or 2, characterized in that, The mounting bracket is a spring hook.

7. The non-contact DC voltage measuring device according to claim 1 or 2, characterized in that, It also includes a grounding screw post, which has a third end and a fourth end. The third end is exposed on the surface of the device housing for connecting to an adjacent grounding system, and the fourth end passes through the device housing and is electrically connected to the grounding terminal of the main control circuit board.

8. The non-contact DC voltage measuring device according to claim 1 or 2, characterized in that, The device housing includes a front cover with a first groove and a rear cover with a second groove. The front cover and the rear cover are detachably connected, such that the first groove and the second groove together enclose and form a mounting cavity for accommodating the main control circuit board and at least one voltage acquisition module.

9. The non-contact DC voltage measuring device according to claim 8, characterized in that, At least one mounting hole is provided on one side wall of the first tank, and all the mounting holes are provided adjacent to the bottom wall of the first tank. The second end of each of the hooks passes through one of the mounting holes into the outer shell of the device.

10. The non-contact DC voltage measuring device according to claim 8, characterized in that, A quick-connector is provided on the side of the front cover of the device away from the rear cover of the device, for quick installation and removal of the non-contact DC voltage measuring device on the protective cabinet.

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