Portable three-phase secondary current connecting piece direct current resistance testing method and device

Abstract

The invention discloses a portable three-phase secondary current connecting piece direct current resistance testing method and device. The method comprises the steps that sampling signals are collected; the collected signals are adjusted through a signal conditioning circuit; the adjusted signal is transmitted to a single chip microcomputer, and a control signal of the single chip microcomputer is sent to a liquid crystal screen control circuit; an operation command is processed by the liquid crystal screen control circuit and is received by the single chip microcomputer; the single-chip microcomputer firstly sends data needing to be exported to the memory card control circuit. The demand of human resources is obviously reduced; therefore, the whole testing process is greatly accelerated, and the working efficiency is improved; the working convenience is improved; a large amount of cost can be saved for enterprises, and economic benefits are improved; and the safety of field work is improved.

Description

Technical Field

[0001] The invention relates to the technical field of direct resistance testing, and in particular to a portable direct resistance testing method and device for a three-phase secondary current connecting piece. Background Art

[0002] According to the requirements of the work instructions, after completing the disconnection of the secondary current circuit of the power-off current transformer or opening the current test connector, a DC resistance test must be performed and the data uploaded to the system.

[0003] The DC resistance measurement and data upload system process is tedious, time-consuming and labor-intensive, which improves work efficiency. Summary of the invention

[0004] In view of the above-mentioned problems, the present invention is proposed.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: a portable three-phase secondary current connection piece direct resistance test method, comprising:

[0006] Collecting sampling signals;

[0007] The collected signal is adjusted by a signal conditioning circuit;

[0008] The adjusted signal is transmitted to the single-chip microcomputer, and the control signal of the single-chip microcomputer is sent to the LCD screen control circuit;

[0009] The operation command is processed by the LCD control circuit and received by the microcontroller;

[0010] The single chip microcomputer first sends the data to be exported to the memory card control circuit.

[0011] As a preferred solution of the portable three-phase secondary current connection piece direct resistance test method of the present invention, wherein: the sampling signal includes connecting a high-precision resistance test module through a test interface and measuring the resistance using Ohm's law;

[0012] When the high-precision resistance test module is working, a constant voltage and current power supply is supplied to the external resistance to be measured, and the measurement signal is converted into a 4-20mA electrical signal through a signal conversion chip, and finally transmitted to the main control circuit;

[0013] Among them, DC resistance is the DC resistance.

[0014] As a preferred solution of the portable three-phase secondary current connection piece direct resistance test method of the present invention, wherein: the signal conditioning circuit includes converting the 4-20mA weak current signal sent by the high-precision resistance measurement module into a 0-3.3V voltage signal that can be collected by the single-chip microcomputer;

[0015] The circuit includes a proportional amplifier circuit and a voltage follower circuit;

[0016] The proportional amplifier circuit is responsible for converting the weak current signal of 0-20mA into a voltage signal that can be collected by the single-chip microcomputer, playing the role of signal conversion;

[0017] The voltage follower circuit makes the signal transmission more stable.

[0018] As a preferred solution of the portable three-phase secondary current connection piece direct resistance test method of the present invention, wherein: the single chip microcomputer samples the signal transmitted by the signal conditioning circuit, fits the relationship between the current, voltage and resistance according to the size distribution of the sampled values, and finally obtains a formula for calculating the measured resistance;

[0019] During measurement, the microcontroller calculates the resistance value of the resistor to be measured according to the formula.

[0020] As a preferred solution of the portable three-phase secondary current connection piece direct resistance test method described in the present invention, wherein: the LCD display control circuit connects the single-chip microcomputer and the LCD display, the control signal of the single-chip microcomputer is first sent to the LCD display control circuit, and then the LCD display control circuit controls the display of the LCD display, and at the same time, the operator's operation commands on the LCD screen also need to be processed by the LCD display control circuit first, and then can be received by the single-chip microcomputer.

[0021] As a preferred solution of the portable three-phase secondary current connection piece direct resistance test method of the present invention, wherein: the memory card control circuit is connected to the single-chip microcomputer and the memory card interface, the single-chip microcomputer first sends the data to be exported to the memory card control circuit, and the memory card is operated and the text information is edited through the memory card control circuit;

[0022] During work, the staff selects the historical measurement data to be exported through the LCD screen and sends the historical measurement data to the single-chip microcomputer, which exports the historical measurement data to the memory card through the memory card control circuit.

[0023] A portable three-phase secondary current connection piece direct resistance test device using the method as claimed in the present invention, characterized in that it includes a high-precision resistance measurement module, a main control circuit, a touch-type liquid crystal display, a battery, a power switch, and a device housing;

[0024] The device has a total of 3 high-precision resistance measurement modules, which can measure the resistance values ​​of 3 current test connection pieces at the same time;

[0025] The high-precision resistance measurement module uses Ohm's law to measure resistance. When the module is working, it will supply a constant voltage and current power supply to the external measured resistance, convert the measurement signal into a 4-20mA electrical signal through a signal conversion chip, and finally transmit it to the main control circuit.

[0026] As a preferred solution of the portable three-phase secondary current connection piece direct resistance test system of the present invention, wherein: the function of the main control circuit is to control the entire device, which includes a single-chip microcomputer circuit, a signal conditioning circuit, a liquid crystal display control circuit, a memory card control circuit, and a power supply circuit;

[0027] The single-chip microcomputer circuit is MCU, which is equivalent to the CPU of a computer. Its main functions in this control circuit are logic judgment, LCD display control, and collection and calculation of sampling signals.

[0028] A computer device comprises: a memory and a processor; the memory stores a computer program, wherein: the processor implements the steps of any one of the methods of the present invention when executing the computer program.

[0029] A computer-readable storage medium stores a computer program, wherein: when the computer program is executed by a processor, the steps of any one of the methods of the present invention are implemented.

[0030] Beneficial effects of the invention: Efficiency improvement: The traditional DC resistance test process requires two people to cooperate, one person is responsible for measurement, and the other person records the data and makes calculations. The new portable three-phase secondary current connection piece DC resistance tester can be operated by one person and measure the resistance of three phases at the same time, which significantly reduces the demand for human resources.

[0031] Time saving: In the traditional method, the measurement and data upload process takes a total of 50 minutes. After using the new tester, the test time is shortened to 6 minutes, and data upload only takes 4 minutes, a total of only 10 minutes. This greatly speeds up the entire test process and improves work efficiency.

[0032] Portability and ease of use: Due to its portable design, the new tester can be easily carried to different work sites, making it convenient for on-site workers to conduct quick tests. At the same time, the simplified operation process allows even non-professionals to quickly get started, further improving the convenience of work.

[0033] Cost savings: By reducing manpower requirements, shortening working hours and reducing error rates, the new tester can help companies save a lot of costs and improve economic benefits in the long term.

[0034] Enhanced safety: Automated data processing and algorithm judgment reduce the number of manual operations, thereby reducing safety risks caused by improper operation and improving the safety of on-site work. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0036] Figure 1 An overall flow chart of a portable three-phase secondary current connection piece direct resistance test method provided by the first embodiment of the present invention;

[0037] Figure 2 A circuit principle block diagram of a portable three-phase secondary current connection piece direct resistance test method provided by the second embodiment of the present invention;

[0038] Figure 3 A signal conditioning circuit diagram of a portable three-phase secondary current connection piece direct resistance test method provided by the first embodiment of the present invention;

[0039] Figure 4 A power circuit functional diagram of a portable three-phase secondary current connection piece direct resistance test method provided by the second embodiment of the present invention;

[0040] Figure 5 A functional structure diagram of a power supply circuit of a portable three-phase secondary current connection piece direct resistance testing method provided in the second embodiment of the present invention. DETAILED DESCRIPTION

[0041] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the drawings of the specification. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary persons in the art without creative work should fall within the scope of protection of the present invention.

[0042] Example 1, reference Figure 1 , Figure 3 , as an embodiment of the present invention, provides a portable three-phase secondary current connection piece direct resistance test method, comprising:

[0043] S1: Collect the sampling signal.

[0044] Furthermore, the sampling signal includes connecting a high-precision resistance test module through a test interface and measuring the resistance using Ohm's law. When the high-precision resistance test module is working, a constant voltage and current power supply is supplied to the external measured resistance, and the measurement signal is converted into a 4-20mA electrical signal through a signal conversion chip, and finally transmitted to the main control circuit.

[0045] The main control circuit functions to control the entire device, including single chip microcomputer circuit, signal conditioning circuit, LCD control circuit, memory card control circuit, power supply circuit, etc. S2: Adjust the collected signal through the signal conditioning circuit.

[0046] The signal conditioning circuit is responsible for converting the 4-20mA weak current signal sent by the high-precision resistance measurement module into a 0-3.3V voltage signal that can be collected by the single-chip microcomputer. The circuit includes a proportional amplifier circuit and a voltage follower circuit. The proportional amplifier circuit is responsible for converting the 0-20mA weak current signal into a voltage signal that can be collected by the single-chip microcomputer, playing a role in signal conversion. The voltage follower circuit has the characteristics of high input impedance and low output impedance, which makes the signal transmission more stable, avoiding the situation where the signal fluctuates severely during the signal collection process of the single-chip microcomputer, and ensuring that the single-chip microcomputer can operate more safely and stably. Figure 3 shown.

[0047] S3: The adjusted signal is transmitted to the microcontroller, and the control signal of the microcontroller is sent to the LCD screen control circuit.

[0048] In other words, the microcontroller samples the signal transmitted by the signal conditioning circuit, fits the relationship between current, voltage and resistance based on the size distribution of the sampled values, and finally derives the formula for calculating the measured resistance. During measurement, the microcontroller calculates the resistance value of the resistor to be measured based on the formula, and uses this method to calculate the resistance values ​​of the other two resistors to be measured.

[0049] The single-chip microcomputer circuit is MCU, which is equivalent to the CPU of a computer. In this control circuit, the main functions are logic judgment, LCD screen control, and sampling signal collection and calculation. Logic judgment is to judge whether the three resistance values ​​calculated by sampling meet the standards. If they do not meet the standards, the control will send out sound and light alarms and LCD screen interface alarms; according to the operation of the LCD screen, it is judged whether the historical data should be exported.

[0050] S4: The operation command is processed by the LCD control circuit and received by the microcontroller.

[0051] Furthermore, the LCD screen control circuit connects the single-chip microcomputer and the LCD screen. The control signal of the single-chip microcomputer is first sent to the LCD screen control circuit, and then the LCD screen control circuit controls the display of the LCD screen. At the same time, the operator's operation commands on the LCD screen also need to be processed by the LCD screen control circuit first before they can be received by the single-chip microcomputer.

[0052] S5: The single chip microcomputer sends the data to be exported to the memory card control circuit first.

[0053] The memory card control circuit connects the single-chip microcomputer and the memory card interface. The single-chip microcomputer sends the data to be exported to the memory card control circuit first, through which the memory card is operated and the text information is edited. When working, the staff selects the historical measurement data to be exported through the LCD screen, and then sends the historical measurement data to the single-chip microcomputer. Finally, the single-chip microcomputer exports the historical measurement data to the memory card through the memory card control circuit.

[0054] Example 2, reference Figure 2 , Figure 4 , Figure 5 , which is an embodiment of the present invention, provides a portable three-phase secondary current connection piece direct resistance test device, comprising:

[0055] A portable three-phase secondary current connection piece direct resistance tester has a three-way resistance measurement interface, which can measure three current test connection pieces at the same time. The LCD touch screen serves as a human-computer interaction interface. Its functions include: displaying measured resistance values, viewing historical measurement data results, exporting data to a memory card, etc. It has a built-in 12V rechargeable lithium battery and uses a Type-C interface to charge the lithium battery.

[0056] It mainly includes high-precision resistance measurement module, main control circuit, touch LCD display, battery, power switch, device shell, and the overall circuit principle block diagram is as follows: Figure 2 As shown. After accessing the test interface, the data is transmitted to the signal conditioning circuit through three high-precision resistance measurement modules, and then to the single-chip microcomputer. The single-chip microcomputer realizes the operation through interaction with the LCD control circuit. Finally, the storage is completed through the memory card control circuit.

[0057] The resistance tester has a total of 3 high-precision resistance measurement modules, which measure the resistance values ​​of 3 current test connectors at the same time. The principle of the high-precision resistance measurement module is to measure the resistance using Ohm's law. When the module is working, it will supply a constant voltage and constant current power supply to the external measured resistance, and then convert the measurement signal into a 4-20mA electrical signal through the signal conversion chip, and finally transmit it to the main control circuit.

[0058] The main control circuit controls the entire device. It includes single-chip microcomputer circuit, signal conditioning circuit, LCD control circuit, memory card control circuit, power supply circuit, etc. The single-chip microcomputer circuit is MCU, which is equivalent to the CPU of a computer. The functions of this control circuit are mainly logic judgment, LCD control, and acquisition and calculation of sampling signals.

[0059] The signal conditioning circuit includes a proportional amplifier circuit and a voltage follower circuit, which plays a role in signal conversion. The voltage follower circuit has the characteristics of high input impedance and low output impedance, making the signal transmission more stable.

[0060] The LCD display control circuit can realize the transmission of interactive information between the single-chip microcomputer and the LCD display.

[0061] The memory card control circuit is connected to the single chip microcomputer and the memory card interface, and finally the single chip microcomputer exports the historical measurement data to the memory card through the memory card control circuit.

[0062] The function of the power circuit is to convert the 12V rechargeable lithium battery voltage into the voltage level required by each circuit and module. For example, the microcontroller circuit requires a 3.3V voltage, the LCD screen requires a 5V voltage, and so on. Figure 4 shown.

[0063] The overall appearance of the power circuit function is similar to that of a digital multimeter. For easy operation and observation, the LCD screen is designed above the overall structure. The three resistance measurement interfaces are located directly below the LCD screen for easy wiring and operation. The connectors used are the more commonly used 4mm banana female sockets. The Type-C charging interface and power switch are designed on the side in front for ease of operation and overall aesthetics. The memory card slot is designed on the right side. The structural diagram is as follows: Figure 5 shown.

[0064] If the above functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program codes.

[0065] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in conjunction with such instruction execution systems, devices or apparatuses. For the purposes of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in conjunction with such instruction execution systems, devices or apparatuses.

[0066] More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or more wires (electronic device), a portable computer disk case (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be a paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, deciphering or, if necessary, processing in another suitable manner, and then stored in a computer memory.

[0067] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, a plurality of steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0068] Example 3 is an embodiment of the present invention, which provides a portable three-phase secondary current connection piece direct resistance testing method. In order to verify the beneficial effects of the present invention, scientific demonstration is carried out through economic benefit calculation and simulation experiments.

[0069] Using the traditional method, the DC resistance test process requires two people to cooperate, one person measures the DC resistance of the three-phase secondary current connector phase by phase, and the other person records the data and makes calculations. After the measurement, the data needs to be manually entered. Taking a line interval as an example, the measurement process takes 20 minutes, the data upload takes 30 minutes, and the total time is 50 minutes.

[0070] With the present invention, a single operator can measure the resistance of three phases at the same time and automatically save the data to a storage card. At the same time, the built-in algorithm can automatically compare the data to determine the circuit status. This improvement shortens the test time to 6 minutes, and data upload only takes 4 minutes, a total of 10 minutes, greatly reducing labor and time costs.

[0071] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A portable three-phase secondary current connection piece direct resistance test method, characterized in that: include: Collecting sampling signals; The collected signal is adjusted by a signal conditioning circuit; The adjusted signal is transmitted to the single-chip microcomputer, and the control signal of the single-chip microcomputer is sent to the LCD screen control circuit; The operation command is processed by the LCD control circuit and received by the microcontroller; The single chip microcomputer first sends the data to be exported to the memory card control circuit.

2. The portable three-phase secondary current connection piece direct resistance test method according to claim 1, characterized in that: The sampling signal includes connecting a high-precision resistance test module through a test interface and measuring the resistance using Ohm's law; When the high-precision resistance test module is working, a constant voltage and current power supply is supplied to the external resistance to be measured, and the measurement signal is converted into a 4-20mA electrical signal through a signal conversion chip, and finally transmitted to the main control circuit; Among them, DC resistance is the DC resistance.

3. The portable three-phase secondary current connection piece direct resistance test method according to claim 2, characterized in that: The signal conditioning circuit includes converting the 4-20mA weak current signal sent by the high-precision resistance measurement module into a 0-3.3V voltage signal that can be collected by the single-chip microcomputer; The circuit includes a proportional amplifier circuit and a voltage follower circuit; The proportional amplifier circuit is responsible for converting the weak current signal of 0-20mA into a voltage signal that can be collected by the single-chip microcomputer, playing the role of signal conversion; The voltage follower circuit makes the signal transmission more stable.

4. The portable three-phase secondary current connection piece direct resistance test method according to claim 3, characterized in that: The single chip microcomputer samples the signal transmitted by the signal conditioning circuit, fits the relationship between the current, voltage and resistance according to the size distribution of the sampled values, and finally obtains a formula for calculating the measured resistance; During measurement, the microcontroller calculates the resistance value of the resistor to be measured according to the formula.

5. The portable three-phase secondary current connection piece direct resistance test method according to claim 4, characterized in that: The LCD screen control circuit connects the single-chip microcomputer and the LCD screen. The control signal of the single-chip microcomputer is first sent to the LCD screen control circuit, and then the LCD screen control circuit controls the display of the LCD screen. At the same time, the operator's operation commands on the LCD screen also need to be processed by the LCD screen control circuit first before they can be received by the single-chip microcomputer.

6. The portable three-phase secondary current connection piece direct resistance test method according to claim 5, characterized in that: The memory card control circuit is connected to the single-chip microcomputer and the memory card interface. The single-chip microcomputer first sends the data to be exported to the memory card control circuit, and the memory card is operated and the text information is edited through the memory card control circuit; During work, the staff selects the historical measurement data to be exported through the LCD screen and sends the historical measurement data to the single-chip microcomputer, which exports the historical measurement data to the memory card through the memory card control circuit.

7. A portable three-phase secondary current connection piece direct resistance test device using the method as claimed in any one of claims 1 to 6, characterized in that: It includes a high-precision resistance measurement module, a main control circuit, a touch-type LCD display, a battery, a power switch, and a device housing; The device has a total of 3 high-precision resistance measurement modules, which can measure the resistance values ​​of 3 current test connection pieces at the same time; The high-precision resistance measurement module uses Ohm's law to measure resistance. When the module is working, it will supply a constant voltage and current power supply to the external measured resistance, convert the measurement signal into a 4-20mA electrical signal through a signal conversion chip, and finally transmit it to the main control circuit.

8. The portable three-phase secondary current connection piece direct resistance test device according to claim 7, characterized in that: The main control circuit functions to control the entire device, and includes a single-chip microcomputer circuit, a signal conditioning circuit, a liquid crystal display control circuit, a memory card control circuit, and a power supply circuit; The single-chip microcomputer circuit is MCU, which is equivalent to the CPU of a computer. Its main functions in this control circuit are logic judgment, LCD display control, and collection and calculation of sampling signals.

9. A computer device comprising: Memory and processor; The memory stores a computer program, characterized in that: when the processor executes the computer program, the steps of the portable three-phase secondary current connection piece direct resistance testing method are implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of a portable three-phase secondary current connection piece direct resistance testing method are implemented.

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