A secondary terminal static electricity measuring device

Abstract

The present invention belongs to the field of electrostatic measurement technology, and in particular, is a secondary terminal electrostatic measurement device. In view of the fact that the electrostatic measurement device of the prior art is affected by the magnetic field in the environment and the circuit of the equipment body, which will cause large measurement errors and fail to meet the needs, and is large in size and complex in function, making it difficult to use flexibly on site and fail to meet the requirements, the following scheme is proposed, which includes: an electrostatic protection module for isolating and protecting static electricity, including an electrostatic protection shell and an electrostatic protection coiling mechanism, which are installed in the electrostatic protection shell; an electrostatic detection system for performing electrostatic detection, including an electrostatic detection unit, a signal conversion unit, a data processing unit, a human-computer interaction unit, and a power supply unit. The present invention is small in size and easy to carry, and can effectively prevent maintenance personnel from being injured by electric shock, electrostatic shock, etc. At the same time, it can eliminate static electricity on the surface of the secondary terminal and prevent static electricity from the secondary terminal from accidentally entering the secondary circuit.

Description

Technical Field

[0001] The invention relates to the technical field of electrostatic measurement, and in particular to a secondary terminal electrostatic measurement device. Background Art

[0002] During the normal operation of the substation equipment, a certain amount of charge will accumulate on the surface of the equipment and other charged parts due to electromagnetic induction, friction, contact, etc. These charges are usually low in energy and will not cause serious damage to the human body, but people will obviously feel numbness;

[0003] Under the current detection method, the error is greatly affected by the measurement distance and the size of the object being measured, such as Fig.11 The figure shows the dependence between the size of the target and the electrostatic measurement. At the same time, according to Coulomb's law in electromagnetism, the electric field strength formed by the charge is inversely proportional to the square of the distance. Affected by the magnetic field in the environment and the circuit of the device itself, the measurement error will be large and it does not meet the requirements.

[0004] The devices currently developed on the market and the electrostatic measurement devices currently used in substations are still large in size, complex in functions, difficult to use flexibly on site, and do not meet the requirements, such as Fig.12 shown.

[0005] The electrostatic measuring device in the prior art is affected by the magnetic field in the environment and the circuit of the device itself, which will cause large measurement errors and fail to meet the needs. In addition, the device is large in size and has complex functions, making it difficult to use flexibly on site and failing to meet the requirements.

[0006] With the continuous development of power electronics technology, miniaturization, integration and portability are the future development trends of instruments and meters. It is urgent to develop an electrostatic measurement and prevention device with a small enough volume to accurately measure the amount of static electricity on the terminal block and combine it with the corresponding static elimination technology. At the same time, the measurement value deviation can meet the demand at long distances. For this purpose, a secondary terminal static electricity measurement device is proposed. Summary of the invention

[0007] The purpose of the present invention is to solve the shortcomings of the prior art electrostatic measuring device that is affected by the magnetic field in the environment and the circuit of the equipment body, which will cause large measurement errors and fail to meet the needs, and is large in size and complex in functions, making it difficult to use flexibly on site and failing to meet the requirements, and a secondary terminal electrostatic measuring device is proposed.

[0008] In order to achieve the above object, the present invention adopts the following technical solutions:

[0009] A secondary terminal electrostatic measurement device, comprising:

[0010] The electrostatic protection module is used to isolate and protect against static electricity, and includes an electrostatic protection shell and an electrostatic protection coiling mechanism. The electrostatic protection coiling mechanism is composed of two groups and is installed in the electrostatic protection shell;

[0011] An electrostatic detection system, used for electrostatic detection, includes an electrostatic detection unit, a signal conversion unit, a data processing unit, a human-computer interaction unit, and a power supply unit;

[0012] The portable wristband is used to fix the device on the wrist. There are two portable wristbands, which can be locked together. A wristband connecting mechanism is arranged on the top of the portable wristband, which is a plug-in type and is used to install the electrostatic protection shell on the portable wristband.

[0013] Preferably, the wristband connecting mechanism includes a connecting seat, and the two sides of the connecting seat are connected to the two wristbands through an axle pin, and the two can rotate relative to each other.

[0014] Preferably, a magnetic groove is provided on the top of the connecting seat, a magnet is arranged in the magnetic groove, a magnet block is fixedly installed on the bottom of the electrostatic protection shell, and the magnet block is inserted into the magnetic groove and attracted to the magnet.

[0015] Preferably, four positioning grooves are formed on the top of the connecting seat, and four positioning rods are fixedly installed on the bottom of the electrostatic protection shell, and the four positioning rods match the four positioning grooves.

[0016] Preferably, the electrostatic protection wire winding mechanism includes a winding reel, a conductive wire is wound on the outer side of the winding reel, one end of the conductive wire is connected to the electrostatic detection unit, and the other end of the conductive wire is connected to the electrostatic detection system, and a support shaft is fixedly installed on the bottom of the winding reel, and the support shaft is rotatably installed on the bottom inner wall of the electrostatic protection shell through a bearing.

[0017] Preferably, a motor is installed on the bottom inner wall of the electrostatic protection shell, a driving gear is installed on the output shaft of the motor, a driven gear is sleeved on the outer side of the support shaft, and the driving gear is meshed with the driven gear, so that the electrostatic protection wire winding mechanism is an electric winding.

[0018] Preferably, the static electricity detection unit includes two dynamic capacitance type detection heads for detecting static electricity.

[0019] Preferably, the signal conversion unit adopts a high common model signal conversion unit.

[0020] Preferably, the data processing unit includes a control chip and an AD analog-to-digital conversion module, the control chip is a GD32F405 chip, and the AD analog-to-digital conversion module is an AD4630 analog-to-digital conversion unit.

[0021] Preferably, the human-computer interaction unit includes an LCD dot matrix liquid crystal screen and buttons, and the LCD dot matrix liquid crystal screen and buttons are both embedded in the top of the electrostatic protection shell.

[0022] Preferably, the power supply unit includes a voltage stabilizing module and a power supply module, the voltage stabilizing module is an LDC voltage stabilizing module, and the power supply module is a lithium iron phosphate rechargeable battery.

[0023] The model of the LDC voltage regulator module is TPS4901A, which is an LDO type switching regulator. The chip has overheat shutdown and current limiting protection functions, strong reliability, high conversion efficiency, small voltage drop power, and high cost performance.

[0024] In the present invention, the beneficial effects of the secondary terminal electrostatic measurement device are:

[0025] The present invention allows the device to be worn on the wrist through two portable wristbands, and two motors are controlled to work through buttons, or one motor is controlled to work. The motor drives the driven gear to rotate through the driving gear, and the driven gear drives the supporting shaft to rotate. The supporting shaft drives the winding disk to rotate. The winding disk relaxes the wire, and the position of the dynamic capacitance type detection head can be adjusted. The motor can be reversely controlled to reel the wire. The electrostatic protection shell is inserted into the magnetic slot through the magnet block, and the position of the electrostatic protection shell is improved through the attraction between the magnet and the magnet block. It is a plug-in connection, and the connection is convenient.

[0026] The research and development of the secondary terminal static electricity detection and prevention device of the present invention can effectively prevent the staff from being injured by static electricity, and can dynamically monitor the static electricity carrying situation on the terminal in real time to protect the safety of the staff and equipment. At the same time, the staff no longer needs to carry out tedious static electricity protection measures, and can focus more on the maintenance task itself, thus improving the efficiency of the maintenance work.

[0027] The present invention is small in size and easy to carry, and can effectively prevent maintenance personnel from being harmed by electric shock, static electricity, etc. At the same time, it can eliminate static electricity on the surface of the secondary terminal, and prevent static electricity on the secondary terminal from accidentally entering the secondary circuit, causing malfunction of the secondary protection device or damage to components. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a system block diagram of a secondary terminal electrostatic measurement device proposed by the present invention;

[0029] Figure 2 A schematic diagram of the structure of a secondary terminal electrostatic measurement device proposed by the present invention;

[0030] Figure 3 A schematic diagram of the structure of part A of a secondary terminal electrostatic measurement device proposed by the present invention;

[0031] Figure 4This is a schematic diagram of the electrostatic protection shell, LCD dot matrix liquid crystal screen, and key structure proposed by the present invention;

[0032] Figure 5 This is a schematic diagram of the top view of the electrostatic protection shell and two winding reels proposed by the present invention;

[0033] Figure 6 This is the working principle diagram of the dynamic capacitance type proposed by the present invention; the dynamic capacitance electrostatic sensor is used for measurement, which consists of two electrodes, one of which is the sensing electrode and the other is the medium to be measured. When static charge accumulates on the surface of the measured object, it will affect the electric field distribution between the electrodes, thereby causing the capacitance value to change.

[0034] Figure 7 A statistical table of output voltage test results proposed by the present invention;

[0035] Figure 8 The schematic diagram of the signal conversion circuit proposed by the present invention;

[0036] Fig. 9 Design diagram for AD4630 circuit;

[0037] Fig.10 This is the schematic diagram of the LDO voltage regulator module;

[0038] Fig.11 It is a measurement principle diagram in the prior art;

[0039] Fig.12 It is a schematic diagram of the structure of a measuring device in the prior art.

[0040] In the figure: 1. portable wristband; 2. wristband connecting mechanism; 21. connecting seat; 22. magnetic slot; 23. magnet; 24. magnet block; 25. positioning rod; 26. positioning slot; 3. electrostatic protection shell; 4. electrostatic protection winding mechanism; 41. winding reel; 42. wire; 43. dynamic capacitance type detection head; 44. support shaft; 45. motor; 46. driving gear; 47. driven gear; 48. bearing; 5. signal conversion unit; 6. data processing unit; 7. LCD dot matrix liquid crystal screen; 71. button; 8. power supply unit. DETAILED DESCRIPTION

[0041] The technical solution of this embodiment will be clearly and completely described below in conjunction with the drawings in this embodiment. Obviously, the described embodiment is only a part of this embodiment, rather than all of the embodiments.

[0042] Embodiment 1

[0043] Reference Figure 1-Figure 10 , a secondary terminal electrostatic measuring device, comprising:

[0044] The electrostatic protection module is used to isolate and protect against static electricity, and includes an electrostatic protection shell 3 and an electrostatic protection wire coiling mechanism 4. The electrostatic protection wire coiling mechanism 4 is composed of two groups and is installed in the electrostatic protection shell 3.

[0045] An electrostatic detection system, used for performing electrostatic detection, comprises an electrostatic detection unit, a signal conversion unit 5, a data processing unit 6, a human-computer interaction unit, and a power supply unit 8;

[0046] A portable wristband 1 is used to fix the device on the wrist. There are two portable wristbands 1, and the two wristbands can be locked together. A wristband connecting mechanism 2 is provided on the top of the portable wristband 1, which is a plug-in type and is used to install an electrostatic protection shell 3 on the portable wristband 1.

[0047] According to the actual weight of the electrostatic measuring device, the mechanical strength of the plug-in structure must be at least 6KSI (that is, it can withstand at least 40N of mechanical stress). Use an object with an integer multiple of the weight of the electrostatic measuring device to measure whether its mechanical strength meets the requirements.

[0048] In this embodiment, the wristband connecting mechanism 2 includes a connecting seat 21, and the two sides of the connecting seat 21 are connected to the two wristbands through axle pins, and the two can rotate relative to each other.

[0049] In this embodiment, a magnetic groove 22 is provided on the top of the connecting seat 21, a magnet 23 is arranged in the magnetic groove 22, a magnet block 24 is fixedly installed on the bottom of the electrostatic protection shell 3, the magnet block 24 is inserted into the magnetic groove 22 and attracted by the magnet 23, four positioning grooves 26 are provided on the top of the connecting seat 21, four positioning rods 25 are fixedly installed on the bottom of the electrostatic protection shell 3, and the four positioning rods 25 cooperate with the four positioning grooves 26.

[0050] In this embodiment, the electrostatic protection wire winding mechanism 4 includes a winding reel 41, and a wire 42 is wound on the outer side of the winding reel 41. One end of the wire 42 is connected to the electrostatic detection unit, and the other end of the wire 42 is connected to the electrostatic detection system. A support shaft 44 is fixedly installed at the bottom of the winding reel 41, and the support shaft 44 is rotatably installed on the bottom inner wall of the electrostatic protection shell 3 through a bearing 48.

[0051] In this embodiment, a motor 45 is installed on the bottom inner wall of the electrostatic protection shell 3, a driving gear 46 is installed on the output shaft of the motor 45, a driven gear 47 is sleeved on the outer side of the support shaft 44, and the driving gear 46 is meshed with the driven gear 47, so that the electrostatic protection winding mechanism 4 is an electric winding.

[0052] In this embodiment, the static electricity detection unit includes two dynamic capacitance detection heads 43 for detecting static electricity.

[0053] In this embodiment, the signal conversion unit 5 adopts a high common model signal conversion unit.

[0054] In this embodiment, the data processing unit 6 includes a control chip and an AD analog-to-digital conversion module. The control chip is a GD32F405 chip, and the AD analog-to-digital conversion module is an AD4630 analog-to-digital conversion unit.

[0055] In this embodiment, the human-computer interaction unit includes an LCD dot matrix liquid crystal screen 7 and a button 71 , and both the LCD dot matrix liquid crystal screen 7 and the button 71 are embedded in the top of the electrostatic protection shell 3 .

[0056] Specifically, the LCD dot matrix liquid crystal screen is subjected to electrostatic discharge immunity test / electrical fast transient pulse group immunity test. The display screen is placed flat on the test bench, and the display area is subjected to contact and air discharge in turn. Ten rounds of discharge are applied at a pre-selected point at a rate of 20 times per second, with a single round of discharge interval of 1s. The screen is observed for abnormal phenomena such as freezing, black screen, screen distortion, restart, etc.

[0057] In this embodiment, the power supply unit 8 includes a voltage stabilizing module and a power supply module. The voltage stabilizing module is an LDC voltage stabilizing module, and the power supply module is a lithium iron phosphate rechargeable battery.

[0058] Specifically, the model of the LDC voltage regulator module is TPS4901A, which is an LDO type switching regulator. The chip has overheat shutdown and current limiting protection functions, strong reliability, high conversion efficiency, small voltage drop power, and high cost performance.

[0059] refer to Fig. 9 ,Lithium battery is used as the power supply voltage of this device. As the use process progresses, the battery discharges and the voltage gradually decreases, but the change within 50 minutes is 0.215V. The device can still work normally, and the goal of outputting three voltages is achieved.

[0060] The team members used standard deviation to perform stability analysis on 5V and 3.3V power supplies. For a normal distribution, the ratio within plus or minus three standard deviations of the mean value is 99.6%.

[0061] (1) Analysis of 5V power supply:

[0062] There are 100 measured data in total, and the voltage fluctuation range is calculated by the following formula:

[0063] Find the average

[0064] Calculating the standard deviation

[0065] Calculate the power supply voltage fluctuation range:

[0066]

[0067] That is, the voltage fluctuation range is ±2.47%≤±5%.

[0068] (2) Analysis of 3.3V power supply:

[0069] There are 100 measured data in total, so n=100.

[0070] Find the average

[0071] Calculating the standard deviation

[0072] Calculate the power supply voltage fluctuation range:

[0073]

[0074] That is, the voltage fluctuation range is ±1.2% ≤ ±5%.

[0075] In summary, the output voltage fluctuation ranges of 9V, 5V and 3.3V power supplies are ±2.15%, ±2.47%, ±1.2% respectively, all of which are stable within 5%, and the goal is achieved.

[0076] Working mode: When in use, the device is worn on the wrist through two portable wristbands 1, and the two motors 45 are controlled to work through the button 71, or one motor 45 is controlled to work. The motor 45 drives the driven gear 47 to rotate through the driving gear 46, and the driven gear 47 drives the supporting shaft 44 to rotate. The supporting shaft 44 drives the winding disk 41 to rotate. The winding disk 41 relaxes the wire 42, and the position of the dynamic capacitance type detection head 43 can be adjusted. The motor 45 is reversely controlled to reel the wire 42. The electrostatic protection shell 3 is inserted into the magnetic slot 22 through the magnet block 24. The magnet 23 is attracted to the magnet block 24 to improve the position of the electrostatic protection shell 3. It is a plug-in connection, and the connection is convenient.

[0077] In this embodiment, the development of the secondary terminal static electricity detection and prevention device can effectively prevent the staff from being injured by static electricity, and can dynamically monitor the static electricity on the terminal in real time to protect the safety of the staff and equipment. At the same time, the staff can focus more on the maintenance task itself without taking tedious static electricity protection measures, thus improving the efficiency of the maintenance work.

[0078] refer to Figure 7 In this embodiment, the output voltage test results are statistically analyzed. After the lithium battery is fully charged, it is connected to the power circuit to measure the continuous output voltage of the battery when it is fully charged. Ten groups of batteries are measured each time, and the voltage value is taken every 5 minutes. The voltage output values ​​of each voltage-stabilized power supply module should be stabilized at 5±0.25V and 3.3±0.165V respectively.

[0079] Embodiment 2

[0080] In this embodiment, the power module is selected as follows:

[0081] Since the selection of the power module of the portable electrostatic detection system mainly considers the rechargeability and power supply stability, a rechargeable battery power supply is selected, and the main selection basis is the two factors of self-discharge rate and voltage fluctuation rate.

[0082] Among them, the self-discharge rate formula is:

[0083]

[0084] The voltage fluctuation calculation formula is:

[0085]

[0086] Use the above formula to select the power module and choose the appropriate power supply to use.

[0087] The above description is only a preferred specific implementation manner of this embodiment, but the protection scope of this embodiment is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of this embodiment within the technical scope disclosed in this embodiment, and they should be covered by the protection scope of this embodiment.

Claims

1. A secondary terminal electrostatic measurement device, characterized in that: include: The electrostatic protection module is used for isolating and protecting against static electricity, and comprises an electrostatic protection shell (3) and an electrostatic protection wire coiling mechanism (4). The electrostatic protection wire coiling mechanism (4) is composed of two groups and is installed in the electrostatic protection shell (3); An electrostatic detection system is used for performing electrostatic detection, comprising an electrostatic detection unit, a signal conversion unit (5), a data processing unit (6), a human-machine interaction unit, a power supply unit (8), and the signal conversion unit (5), wherein the signal conversion unit (5) adopts a high-common model signal conversion unit; A portable wristband (1) is used to fix a device on a wrist. The portable wristbands (1) are two in number and can be locked together. A wristband connection mechanism (2) is provided at the top of the portable wristband (1) and is of a plug-in type and is used to install an electrostatic protection shell (3) on the portable wristband (1).

2. A secondary terminal electrostatic measurement device according to claim 1, characterized in that: The wristband connecting mechanism (2) comprises a connecting seat (21), and two sides of the connecting seat (21) are connected to two wristbands via axle pins.

3. A secondary terminal electrostatic measurement device according to claim 2, characterized in that: The top of the connecting seat (21) is provided with a magnetic groove (22), a magnet (23) is arranged in the magnetic groove (22), and a magnet block (24) is fixedly installed at the bottom of the electrostatic protection shell (3), and the magnet block (24) is inserted into the magnetic groove (22) and attracted to the magnet (23).

4. A secondary terminal electrostatic measurement device according to claim 2, characterized in that: The top of the connection seat (21) is provided with four positioning grooves (26), and the bottom of the electrostatic protection shell (3) is fixedly installed with four positioning rods (25), and the four positioning rods (25) are matched with the four positioning grooves (26).

5. A secondary terminal static electricity measuring device according to claim 1, characterized in that: The electrostatic protection wire winding mechanism (4) comprises a winding reel (41), a wire (42) is wound on the outer side of the winding reel (41), one end of the wire (42) is connected to the electrostatic detection unit, and the other end of the wire (42) is connected to the electrostatic detection system, and a support shaft (44) is fixedly installed at the bottom of the winding reel (41), and the support shaft (44) is rotatably installed on the bottom inner wall of the electrostatic protection shell (3) through a bearing (48).

6. A secondary terminal static electricity measuring device according to claim 1, characterized in that: A motor (45) is installed on the inner wall of the bottom of the electrostatic protection shell (3); a driving gear (46) is installed on the output shaft of the motor (45); a driven gear (47) is sleeved on the outer side of the support shaft (44); and the driving gear (46) meshes with the driven gear (47).

7. A secondary terminal static electricity measuring device according to claim 1, characterized in that: The static electricity detection unit comprises two dynamic capacitance type detection heads (43) for detecting static electricity.

8. A secondary terminal static electricity measuring device according to claim 1, characterized in that: The data processing unit (6) comprises a control chip and an AD analog-to-digital conversion module, the control chip is a GD32F405 chip, and the AD analog-to-digital conversion module is an AD4630 analog-to-digital conversion unit.

9. A secondary terminal static electricity measuring device according to claim 1, characterized in that: The human-machine interaction unit comprises an LCD dot matrix liquid crystal screen (7) and a key (71), and the LCD dot matrix liquid crystal screen (7) and the key (71) are both embedded in the top of the electrostatic protection shell (3).

10. A secondary terminal static electricity measuring device according to claim 1, characterized in that: The power supply unit (8) comprises a voltage stabilizing module and a power supply module, the voltage stabilizing module is an LDC voltage stabilizing module, and the power supply module is a lithium iron phosphate rechargeable battery.

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