Intelligent metering inspection tester

Abstract

The invention provides an intelligent metering inspection tester which comprises a controller, and a power utilization inspection tester test module, a capacity test module, a material test module, a transformation ratio test module, an input and output module and a power supply module which are connected with the controller, the input / output module is used for receiving an instruction input by a user; the controller is used for controlling the power utilization tester test module, the capacity test module, the material test module and the transformation ratio test module to execute corresponding measurement tasks according to an instruction input by a user, receiving a measurement signal, and obtaining a power utilization tester test result, a capacity test result, a material test result and a transformation ratio test result according to the measurement signal; the input and output module is used for outputting a test result of the electricity tester, a capacity test result, a material test result and a transformation ratio test result according to a control command of the controller; the power supply module is used for providing a stable working power supply for the intelligent metering inspection tester. According to the invention, the workload of on-site electricity metering inspection can be reduced, and the efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field, and in particular to an intelligent metering and testing instrument. Background Art

[0002] Metering and line loss management are important parts of the power supply system. However, metering inspection is one of the important tasks to control line loss. The grassroots on-site inspection work involves many process links, including transformer capacity verification, high and low voltage meter inspection, high and low voltage CT ratio inspection, meter phase connection inspection, evidence photography, dynamic aerial photography, etc. On-site electricity metering inspection is the basis for the safe operation of the power system, safe electricity use by users, and the investigation and punishment of illegal electricity use. It is also an indispensable task to reduce line losses.

[0003] The use of equipment such as transformer capacity review, high-supply high-meter inspection, high-supply low-meter inspection, high- and low-voltage CT ratio inspection, meter wiring, phase verification, evidence photography, dynamic aerial photography and other equipment are essential products. A lot of equipment is required, and about 15 equipment bags need to be carried for one on-site work. Therefore, the current on-site electricity metering inspection workload is large and the efficiency is low. Summary of the invention

[0004] The purpose of the present invention is to provide an intelligent metering and inspection instrument to reduce the workload of on-site electricity metering and inspection and improve efficiency.

[0005] To achieve the above-mentioned object, the present invention provides an intelligent metering inspection instrument, comprising a controller and an electricity inspection instrument test module, a capacity test module, a material test module, a ratio test module, an input-output module and a power supply module connected to the controller;

[0006] The input-output module is used to receive instructions input by a user;

[0007] The controller is used to control the power inspection instrument test module, capacity test module, material test module, and transformation ratio test module to perform corresponding measurement tasks according to the instructions input by the user, and receive measurement signals from the power inspection instrument test module, capacity test module, material test module, and transformation ratio test module, and obtain power inspection instrument test results, capacity test results, material test results, and transformation ratio test results according to the measurement signals;

[0008] The input-output module is used to output the test results of the power inspection instrument, the capacity test results, the material test results and the transformation ratio test results according to the control command of the controller;

[0009] The power supply module is used to provide a stable working power supply for the intelligent metering and testing instrument.

[0010] Preferably, the controller is connected to the power consumption checker test module, capacity test module, material test module and transformation ratio test module through an AD sampling module, and the AD sampling module is used to convert the measurement signals of the power consumption checker test module, capacity test module, material test module and transformation ratio test module into digital signals and then output them to the controller for processing to obtain the power consumption checker test results, capacity test results, material test results and transformation ratio test results.

[0011] Preferably, the AD sampling module is connected to the power consumption inspector test module, capacity test module, material test module and transformation ratio test module through a relay, and the AD sampling module is used to select and receive the measurement signal of one of the power consumption inspector test module, capacity test module, material test module and transformation ratio test module by switching the relay.

[0012] Preferably, the power consumption inspection instrument test module includes a current acquisition unit and a voltage acquisition unit; the current acquisition unit includes two balancing resistors connected in parallel in the circuit and a filter capacitor connected in series with one of the balancing resistors; the voltage acquisition unit includes a plurality of voltage-dividing resistors connected in series in sequence.

[0013] Preferably, the capacity testing module comprises a signal conversion unit and a signal amplification unit, and the capacity signal is converted into a 50 Hz sine wave signal by the signal conversion unit and then amplified by the signal amplification unit before being output.

[0014] Preferably, the material testing module comprises at least two parallel circuits, and each parallel circuit has at least two high-precision resistors connected in series.

[0015] Preferably, the transformation ratio test module and the controller are also connected via a high-voltage clamp-on transformer.

[0016] Preferably, the power supply module comprises a DCDC power module and a USB and charging module connected to the controller, and the DCDC power module and the USB and charging module are both connected to a lithium battery pack.

[0017] Preferably, the input-output module includes a touch LCD screen, an output printing device and an input-output pulse module. The touch LCD screen is used to receive instructions input by the user and output and display the test results of the power consumption tester, capacity test results, material test results and transformation ratio test results. The output printing device is used to output and print the test results of the power consumption tester, capacity test results, material test results and transformation ratio test results.

[0018] The present invention has the following beneficial effects:

[0019] A variety of test functions are integrated into one device, including power consumption inspection, capacity test, material test, ratio test, etc., which reduces the number of equipment that needs to be carried on site and simplifies the operation process; various measurement tasks are automatically performed by the controller, which greatly shortens the on-site inspection time and improves work efficiency; the use of professional test modules can more accurately obtain various measurement data, which is helpful to discover and solve problems; the design of the input and output modules allows users to easily input instructions and view test results, reducing the difficulty of operation; the power supply module provides a stable working power supply for the equipment, ensuring the normal operation of the equipment in complex environments; the intelligent metering and inspection instrument of the present invention can effectively reduce the workload of on-site power consumption metering inspection, improve inspection efficiency, and provide strong support for the safe operation of the power system and line loss management. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 The figure is a schematic diagram of the structure of an intelligent metering and inspection instrument in an embodiment of the present invention. DETAILED DESCRIPTION

[0022] The detailed description of the accompanying drawings is intended as an illustration of the current embodiments of the present invention and is not intended to represent the only form in which the present invention can be implemented. It should be understood that the same or equivalent functions can be accomplished by different embodiments that are intended to be included in the spirit and scope of the present invention.

[0023] See also Figure 1 , an embodiment of the present invention provides an intelligent metering inspection instrument, including a controller and an electricity inspection instrument test module, a capacity test module, a material test module, a ratio test module, an input-output module and a power supply module connected to the controller;

[0024] The input-output module is used to receive instructions input by a user;

[0025] The controller is used to control the power inspection instrument test module, capacity test module, material test module, and transformation ratio test module to perform corresponding measurement tasks according to the instructions input by the user, and receive measurement signals from the power inspection instrument test module, capacity test module, material test module, and transformation ratio test module, and obtain power inspection instrument test results, capacity test results, material test results, and transformation ratio test results according to the measurement signals;

[0026] The input-output module is used to output the test results of the power inspection instrument, the capacity test results, the material test results and the transformation ratio test results according to the control command of the controller;

[0027] The power supply module is used to provide a stable working power supply for the intelligent metering and testing instrument.

[0028] Specifically, the controller is the core part of the smart metering instrument, responsible for coordinating and controlling the operations of all other modules; the controller usually contains a microprocessor or microcontroller, which can execute preset programs to control the operation of the equipment.

[0029] The power consumption tester test module is a module used to detect power consumption. It can check parameters such as voltage, current, power, and power factor. It can automatically collect data without manual measurement one by one.

[0030] The capacity test module is used to test the capacity of the transformer to ensure that the transformer works at its rated capacity; by measuring the load current and voltage of the transformer, the actual capacity can be calculated.

[0031] The material testing module is used to detect the materials of wires, cables or other electrical equipment to ensure that they meet the prescribed safety standards; it can include functions such as resistance testing and insulation testing.

[0032] The ratio test module is used to test the ratio of current transformers (CT) and voltage transformers (PT); ensuring the correct ratio is critical to the accuracy of the metering system.

[0033] The input and output module provides an interface for users to interact with the device, including an interface for inputting commands and viewing results; it can be a physical button, a touch screen, or a wireless interface, etc. The power supply module provides the necessary power for the smart metering and inspection instrument; it can include a built-in battery, an external power adapter, etc.

[0034] The working process of the intelligent metering inspection instrument of this embodiment is as follows:

[0035] Receiving instructions: The user inputs instructions through the input and output module to tell the smart metering tester which tests need to be performed;

[0036] Execute measurement tasks: The controller controls the corresponding test module to perform measurement according to the instructions input by the user; for example, if the user needs to check the capacity of the transformer, the controller will activate the capacity test module;

[0037] Data acquisition: When performing measurement tasks, each test module will collect relevant electrical parameters and convert these parameters into electrical signals;

[0038] Processing and displaying results: The controller receives the measurement signal from the test module, processes it, and obtains the test result; then, the controller sends the test result to the input and output module, and the user can view the result on the display;

[0039] Power supply: During the whole process, the power supply module ensures that the intelligent metering and inspection instrument has a stable working power supply.

[0040] Through this design, the intelligent metering inspection instrument can complete the metering inspection tasks efficiently and accurately, reduce the dependence on multiple single-function equipment, simplify on-site operations, and improve work efficiency.

[0041] Furthermore, the controller is connected to the power consumption checker test module, capacity test module, material test module and transformation ratio test module through an AD sampling module. The AD sampling module is used to convert the measurement signals of the power consumption checker test module, capacity test module, material test module and transformation ratio test module into digital signals and then output them to the controller for processing to obtain the power consumption checker test results, capacity test results, material test results and transformation ratio test results.

[0042] Specifically, the AD sampling module (Analog-to-Digital Converter) converts analog signals into digital signals so that the controller can process these signals. When performing measurement tasks, the electrical inspection instrument test module, capacity test module, material test module and ratio test module will output analog signals. These analog signals may be continuous voltage or current signals, which represent the measured electrical parameters. The role of the AD sampling module is to convert these analog signals into digital signals. Digital signals are composed of a series of numbers (usually binary numbers), which can be directly processed by a microprocessor or microcontroller (i.e., controller).

[0043] The AD sampling module performs sampling during the conversion process, that is, measuring the value of the analog signal at a specific time interval. The sampling rate determines the number of samples per second. It must be high enough to avoid distortion and satisfy the Nyquist sampling theorem to ensure that the original signal can be accurately reconstructed. Quantization is the process of converting the continuous amplitude signal obtained by sampling into a discrete amplitude signal. The AD sampling module converts the amplitude of the analog signal into a finite number of discrete values.

[0044] When the test modules perform measurements, they generate analog signals corresponding to the measured parameters (such as voltage, current, capacity, etc.), which are fed into the AD sampling module. The AD sampling module samples and quantizes these signals and converts them into digital signals. The converted digital signals are output to the controller. After receiving the digital signals, the controller processes these signals according to the preset program. The processing process includes calculation, comparison, analysis, etc. to obtain the test results of the power meter, capacity test results, material test results, and transformation ratio test results. The controller displays the processed results to the user through the input and output modules, or stores them for subsequent analysis.

[0045] By using AD sampling modules, smart metering instruments can convert analog electrical parameters into digital form, which not only improves the measurement accuracy and reliability, but also makes the measurement data easier to be processed and analyzed by computer systems, which is crucial for realizing automated and intelligent power system monitoring and management.

[0046] Furthermore, the AD sampling module is connected to the power consumption inspector test module, capacity test module, material test module and transformation ratio test module through a relay, and the AD sampling module is used to select and receive the measurement signal of one of the power consumption inspector test module, capacity test module, material test module and transformation ratio test module by switching the relay.

[0047] Specifically, in the design of the intelligent metering and inspection instrument, the AD sampling module is connected to each test module through a relay, providing a flexible signal selection mechanism. A relay is an electrical control device that can control a high voltage and high current circuit with a low voltage and a weak current. In the intelligent metering and inspection instrument, the main function of the relay is to act as a switch, and to select which test module's measurement signal is connected to the AD sampling module according to the control signal.

[0048] The analog measurement signals generated by the power inspection instrument test module, capacity test module, material test module and ratio test module are connected to the AD sampling module through relays. Each test module has a corresponding relay, or a group of relays is responsible for switching the signals of multiple modules. When it is necessary to obtain a measurement signal from a specific test module, the controller will send a control signal to the corresponding relay. After receiving the control signal, the relay will change the connection state of its internal contacts, thereby connecting the signal line of the selected test module to the AD sampling module. Once the relay completes the selection of the signal line, the analog measurement signal of the selected test module can be transmitted to the AD sampling module through the relay. The AD sampling module samples and quantizes this signal and converts it into a digital signal. The converted digital signal is sent back to the controller, which further processes and analyzes these signals to obtain the final test results.

[0049] Through relay switching, you can flexibly switch between different test modules without physically connecting or disconnecting cables; relays can provide electrical isolation to protect the AD sampling module and controller from high voltage or strong current; relays allow AD sampling modules to be reused, that is, the same AD sampling module can process signals from multiple test modules sequentially or simultaneously, reducing the complexity and cost of the equipment.

[0050] In this way, the intelligent metering tester can efficiently manage the signals of multiple test modules, ensuring that the measurement data of each module can be accurately and timely collected and processed.

[0051] Furthermore, the power consumption inspection instrument test module includes a current acquisition unit and a voltage acquisition unit; the current acquisition unit includes two balancing resistors connected in parallel in the circuit and a filter capacitor connected in series with one of the balancing resistors; the voltage acquisition unit includes a plurality of voltage dividing resistors connected in series in sequence.

[0052] Specifically, the design of the power detector test module is to accurately collect the current and voltage signals in the circuit. The following is an explanation of the working principle of the current acquisition unit and the voltage acquisition unit:

[0053] The current acquisition unit of each phase includes two, such as the balancing resistors R8 and R17 of phase A. In the current acquisition unit, the two balancing resistors R8 and R17 are connected in parallel to the circuit. These resistors are used to detect the current in the circuit because a voltage drop will be generated when the current passes through these resistors. The filter capacitor C1 is connected in series with one of the balancing resistors (such as R8). Its function is to filter out the high-frequency noise in the current signal and ensure that the collected signal is as clean and stable as possible. The current signal is input to the test module through the power inspection instrument interface. This signal first passes through the balancing resistors R8 and R17, and then is filtered by the filter capacitor C1. The filtered current signal is then input to the switching relay. The switching relay can select different signal paths as needed, allowing the AD sampling module to sample the current signal. Finally, the AD sampling module converts the analog current signal into a digital signal, that is, the current sampling value, for further processing by the controller.

[0054] The voltage acquisition unit of each phase includes multiple voltage-dividing resistors, such as R1, R2, R3, R4, R5 and R6 of phase A. The function of these resistor networks is to reduce the high voltage to a level that can be safely processed by the AD sampling module. The voltage signal is input to the test module through the power inspection instrument interface and is divided by the voltage-dividing resistors R1, R2, R3, R4, R5 and R6. The divided voltage signal is input to the switching relay and then enters the AD sampling module. The AD sampling module converts the analog voltage signal into a digital signal, that is, the voltage sampling value, for use by the controller.

[0055] The design of the current acquisition unit and the voltage acquisition unit ensures that the power consumption tester can accurately measure the current and voltage in the circuit. By using balancing resistors, filter capacitors and voltage divider resistors, these units can provide stable and reliable signals, allowing the AD sampling module to collect high-quality current and voltage data. These data are crucial for monitoring, fault diagnosis and maintenance of power systems.

[0056] Furthermore, the capacity test module includes a signal conversion unit and a signal amplification unit. The capacity signal is converted into a 50 Hz sine wave signal by the signal conversion unit and then amplified by the signal amplification unit before being output.

[0057] Specifically, the main function of the signal conversion unit is to generate a sine wave signal of a specific frequency (50Hz). The generated 50Hz sine wave signal is the excitation signal for capacity testing because it simulates the standard AC power frequency in the power system. The function of the signal amplification unit is to increase the power of the sine wave signal to make it strong enough to drive the electrical equipment being tested. The amplified signal is output through the capacity test interface for actual capacity testing.

[0058] The capacity test process is as follows:

[0059] The amplified 50Hz sine wave signal is output through the capacity test interface and applied to the capacitor or device being tested; during the test, the voltage signal applied to the capacitor and the current signal flowing through the capacitor are collected in the loop at the same time. These voltage and current signals are key parameters for testing the capacitor capacity. The collected voltage and current signals need to be switched through relays. The function of the relay is to select and control between different test signals or different test phases. The voltage and current signals after the relay switching are input to the AD sampling module, which converts these analog signals into digital signals, that is, measures the voltage and current values, so that the controller can further process these data.

[0060] The capacity test module tests the capacity of electrical equipment by generating and amplifying a 50Hz sine wave signal. During the test, the module collects the voltage and current signals applied to the equipment and converts them into digital signals through the AD sampling module. These digital signals are then processed by the controller to calculate and display the actual capacity of the capacitor or other equipment. This process is very important for evaluating the working performance and health of the capacitor.

[0061] Furthermore, the material testing module includes at least two parallel circuits, and each parallel circuit has at least two high-precision resistors connected in series.

[0062] Specifically, the material test module is designed to collect and analyze voltage signals in the circuit to evaluate the electrical characteristics of electrical equipment or materials. The material test module contains at least two parallel circuits, each of which has at least two high-precision resistors in series. These high-precision resistors are used for voltage division, that is, to reduce the voltage in the circuit to a level suitable for measurement by the AD sampling module. The material test interface receives three voltage signals from the device under test, and the voltage signal in each parallel circuit is divided by high-precision resistors.

[0063] The material testing process is as follows:

[0064] When the voltage signal passes through the high-precision resistor, the resistor will divide the signal, thereby reducing the amplitude of the signal to make it suitable for the input range of the AD sampling module; the divided voltage signal is input to the switching relay; the function of the relay is to select between different signal paths to ensure that the correct signal is sent to the AD sampling module; by switching the relay, one or more of the three voltage signals can be selectively input to the AD sampling module; the voltage signal after relay switching is finally input to the AD sampling module; the AD sampling module converts these analog voltage signals into digital signals, that is, the three voltage signal values, which can be further processed and analyzed by the controller.

[0065] The material testing module divides the voltage signal through high-precision resistors, and then uses switching relays to selectively input the signal into the AD sampling module for digital processing. In this way, the module can accurately collect three voltage signal values, which are very critical for evaluating the electrical properties of electrical equipment or materials (such as resistivity, insulation performance, etc.). By analyzing these data, it can be determined whether the material or equipment meets specific electrical standards and performance requirements.

[0066] Furthermore, the transformation ratio test module and the controller are connected via a high-voltage clamp-on transformer.

[0067] Specifically, the ratio test module is used to accurately measure and calculate the proportional relationship between the high-voltage current value and the low-voltage current value, that is, the ratio. The current signal is input to the ratio test module through the ratio test interface, which is connected to the circuit being tested to receive the current signal on the low-voltage side. The input current signal is first amplified by an amplifier (such as AD623). The function of the amplifier is to increase the strength of the signal to make it suitable for subsequent AD sampling processing. The amplified current signal is input to the AD sampling module through a switching relay. The AD sampling module converts the amplified analog current signal into a digital signal, that is, the current sampling value, which can be further processed by the controller.

[0068] The current value on the high-voltage side is collected by a high-voltage clamp-on transformer. The high-voltage clamp-on transformer is clamped on the high-voltage line and can safely sense the current without direct contact with the high-voltage power supply. The collected high-voltage current value is sent to the LoRa module in the ratio test module through the wireless LoRa module built into the high-voltage clamp-on transformer. LoRa (Long Range) is a low-power, long-distance wireless communication technology.

[0069] The controller receives the wireless signal from the LoRa module and performs collaborative processing, which means that the controller will synchronously process the current sampling values ​​of the low-voltage side and the high-voltage side and calculate the transformation ratio. The transformation ratio is the ratio of the current value on the high-voltage side to the current value on the low-voltage side, which is very important for the operation and maintenance of the power system.

[0070] Through the above steps, the ratio test module can safely and accurately measure and calculate the current ratio relationship between the high and low voltage sides of the power system. This test is crucial to ensure the normal operation of the power system, detect the performance of transformers and mutual inductors, and perform fault diagnosis.

[0071] Furthermore, the power supply module includes a DCDC power module and a USB and charging module connected to the controller, and the DCDC power module and the USB and charging module are both connected to a lithium battery pack.

[0072] Specifically, the DCDC power module is a DC to DC converter that can convert the input DC voltage into the operating voltage required by the device. This module is connected to the controller and can adjust the output voltage and current according to the controller's instructions. The USB and charging module provides a standard USB interface that can be used for device charging and data transmission. The charging module is responsible for managing the charging process of the lithium battery pack to ensure that the battery is charged at a safe voltage and current.

[0073] The lithium battery pack is the power storage unit of the power supply module, which provides the required electrical energy for the entire device. The lithium battery pack is connected to the DCDC power module and the USB and charging module at the same time. It can be used as a power output and can also be charged through the charging module.

[0074] The working principle of the power supply module is as follows:

[0075] When the device needs power supply, the lithium battery pack provides stable power supply to the device through the DCDC power module. The DCDC power module can output 0-5V voltage and 0-5A current. Such an output range can meet the power requirements of different test modules and electronic components. The controller can adjust the output of the DCDC power module to ensure that each module operates under the best working conditions. When the lithium battery pack is low on power, it can be charged by connecting to an external power source through the USB and charging module, such as connecting to a computer through a USB interface or using a USB charger.

[0076] The power supply module provides a flexible and stable power supply for the smart metering inspection instrument through the DCDC power module and the lithium battery pack. It can adjust the output voltage and current according to the needs of the device, and supports charging the lithium battery pack through USB and the charging module. This design ensures that the device can operate reliably in different working environments and conditions.

[0077] Furthermore, the input-output module includes a touch LCD screen, an output printing device and an input-output pulse module. The touch LCD screen is used to receive instructions input by the user and output and display the test results of the power consumption tester, capacity test results, material test results and transformation ratio test results. The output printing device is used to output and print the test results of the power consumption tester, capacity test results, material test results and transformation ratio test results.

[0078] Specifically, the 7-inch full-touch true-color LCD screen is used to display the operation interface, test results, system status and other information of the intelligent metering and inspection instrument. It is fully touch-sensitive, which means that users can input instructions, navigate menus or perform other operations by touching the screen. The true-color display provides a clear visual effect, making the data display more intuitive, and the touch-screen operation simplifies the user interface and improves the ease of use of the device.

[0079] The output printing device is used to print out the signal results collected by the intelligent metering inspection instrument for easy recording and analysis. This can be a thermal printer, laser printer or inkjet printer, etc. After the on-site test, the staff can directly print the test report for easy archiving and subsequent processing.

[0080] The input and output pulse module is used to receive and send pulse signals, which may be used for metering, synchronization or other specific functions. It can receive pulse signals sent by external devices and can also output pulse signals to external devices. For example, in metering applications, this module can be used to verify the pulse output of the meter to ensure the accuracy of the metering.

[0081] The design of the input and output modules enables the intelligent metering and inspection instrument to not only efficiently collect and process data, but also to display the results in a user-friendly manner and provide a means to physically record the results. Through the touch LCD screen, users can easily operate the equipment and view test data and system status. The output printing device provides the function of converting electronic data into paper records, which is very useful for field work and document management. The input and output pulse modules increase the flexibility of the equipment and compatibility with other systems.

[0082] Furthermore, a frequency synchronization unit is connected to the AD sampling module to synchronize the acquisition frequency of all input signals to the frequency of the input signal, and the output signal is isolated with an optical coupler.

[0083] Specifically, the function of the frequency synchronization unit is to synchronize the acquisition frequency of all input signals to the frequency of the input signal. The sampling rate of the AD sampling module will match the frequency of the input signal, thereby ensuring the accuracy of the sampled data. The frequency synchronization unit can use phase-locked loop (PLL) technology or other synchronization technology to monitor the frequency of the input signal and adjust the clock of the AD sampling to synchronize it with the input signal frequency. Synchronous sampling can reduce aliasing and quantization errors caused by the mismatch between the sampling frequency and the signal frequency, and improve the measurement accuracy of the instrument.

[0084] Optocoupler isolation is an electrical isolation technology used to provide electrical isolation between input and output signals. Optocouplers (optical isolators) use optical signals to transmit information without establishing electrical connections. The input end of the optocoupler receives an electrical signal, which is converted into an optical signal through a built-in light-emitting diode (LED). The optical signal is transmitted through the transparent isolation layer of the optocoupler to a photosensitive element (such as a phototransistor), where the optical signal is converted back into an electrical signal. Electrical isolation can prevent high voltage or current from flowing back to the input end through the output signal, thereby protecting the personal safety of testers. It can also prevent equipment from external electrical interference and improve the stability and reliability of the system.

[0085] The frequency synchronization unit ensures that the AD sampling module can collect signals at a precise frequency, thereby improving the measurement accuracy of the entire intelligent metering and inspection instrument. The optocoupler isolation provides electrical isolation for the output signal, ensures the safety of the tester, and improves the anti-interference ability of the system. These two design elements together improve the performance and safety of the intelligent metering and inspection instrument.

[0086] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or technical improvements in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. An intelligent metering and testing instrument, characterized in that: It includes a controller and an electricity inspection instrument test module, a capacity test module, a material test module, a ratio test module, an input and output module and a power supply module connected to the controller; The input-output module is used to receive instructions input by a user; The controller is used to control the power inspection instrument test module, capacity test module, material test module, and transformation ratio test module to perform corresponding measurement tasks according to the instructions input by the user, and receive measurement signals from the power inspection instrument test module, capacity test module, material test module, and transformation ratio test module, and obtain power inspection instrument test results, capacity test results, material test results, and transformation ratio test results according to the measurement signals; The input-output module is used to output the test results of the power inspection instrument, the capacity test results, the material test results and the transformation ratio test results according to the control command of the controller; The power supply module is used to provide a stable working power supply for the intelligent metering and testing instrument.

2. The intelligent metering inspection instrument according to claim 1, characterized in that: The controller is connected to the power inspection instrument test module, capacity test module, material test module and transformation ratio test module through an AD sampling module. The AD sampling module is used to convert the measurement signals of the power inspection instrument test module, capacity test module, material test module and transformation ratio test module into digital signals and then output them to the controller for processing to obtain the power inspection instrument test results, capacity test results, material test results and transformation ratio test results.

3. The intelligent metering inspection instrument according to claim 2, characterized in that: The AD sampling module is connected to the power inspection instrument test module, capacity test module, material test module and transformation ratio test module through relays, and the AD sampling module is used to select and receive the measurement signal of one of the power inspection instrument test module, capacity test module, material test module and transformation ratio test module by switching relays.

4. The intelligent metering inspection instrument according to claim 2, characterized in that: The power consumption inspection instrument test module includes a current acquisition unit and a voltage acquisition unit; the current acquisition unit includes two balancing resistors connected in parallel in the circuit and a filter capacitor connected in series with one of the balancing resistors; the voltage acquisition unit includes a plurality of voltage dividing resistors connected in series in sequence.

5. The intelligent metering inspection instrument according to claim 2, characterized in that: The capacity test module includes a signal conversion unit and a signal amplification unit. The capacity signal is converted into a 50 Hz sine wave signal by the signal conversion unit and then amplified by the signal amplification unit before output.

6. The intelligent metering inspection instrument according to claim 2, characterized in that: The material testing module includes at least two parallel circuits, and each parallel circuit has at least two high-precision resistors connected in series.

7. The intelligent metering inspection instrument according to claim 2, characterized in that: The transformation ratio test module and the controller are also connected via a high-voltage clamp-type transformer.

8. The intelligent metering inspection instrument according to claim 2, characterized in that: The power supply module comprises a DCDC power module and a USB and charging module connected to the controller, and the DCDC power module and the USB and charging module are both connected to a lithium battery pack.

9. The intelligent metering inspection instrument according to claim 2, characterized in that: The input-output module includes a touch LCD screen, an output printing device and an input-output pulse module. The touch LCD screen is used to receive instructions input by the user and output and display the test results of the power consumption tester, capacity test results, material test results and transformation ratio test results. The output printing device is used to output and print the test results of the power consumption tester, capacity test results, material test results and transformation ratio test results.

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