Device and method for measuring and evaluating direct-current resistance of distribution transformer

Abstract

The invention discloses a distribution transformer DC resistance measurement evaluation device and method, and belongs to the technical field of distribution transformer resistance measurement, and the device comprises a control module which triggers a preset operation process according to a target value instruction, and calculates a measurement value, a measurement deviation and an operation score based on operation data; the operation module operates the distribution transformer measurement process based on the target value instruction to obtain operation data; the driving module is used for driving the galvanometer to act according to the measurement deviation and adjusting the target resistance based on the deviation state of the galvanometer so as to calibrate the deflection of the galvanometer; and the auxiliary module is used for supplying energy to each module and performing indicator lamp response on the state of the evaluation device and the deflection state of the galvanometer. Deflection feedback adjustment can be performed on the galvanometer according to the measurement deviation, so that students can simulate real field processes and resistance adjustment actions, the skill migration rate of the students is improved, and the reliability and accuracy of evaluation results are ensured by performing evaluation by considering the deviation and operation specifications.

Description

Technical Field

[0001] This application relates to the field of power distribution transformer resistance measurement technology, specifically to a device and method for measuring and evaluating the DC resistance of power distribution transformers. Background Technology

[0002] DC resistance measurement of distribution transformers is a core method for diagnosing winding faults. Traditional operation relies on single-arm or double-arm bridges. The core test logic is as follows: the trainee selects the multiplier based on the estimated resistance value → presses the voltage button to turn on the power → adjusts the step time reading for coarse adjustment → presses the galvanometer button to connect the galvanometer → fine-tunes the sliding contact continuity dial to zero the galvanometer (measured value = multiplier × (step time + continuity dial)) → compares with the standard value to determine the result. In conventional assessment devices, the traditional bridge requires manual wiring and lacks a PC target value output function. During the assessment, the standard resistance must be set manually, which is cumbersome and the target value is uncontrollable. Automated devices mostly adopt the mode of "the device automatically adjusts the resistance, and the trainee only reads the data," without the "multiplier-step time-continuity dial" - manual adjustment link, making it impossible to assess actual testing skills. Therefore, conventional assessment devices cannot simultaneously take into account "traditional operation simulation" and "static target value test assessment," resulting in unreliable assessment results. Summary of the Invention

[0003] The purpose of this application is to address the problem that conventional assessment devices cannot simultaneously accommodate "traditional operation simulation" and "static target value testing and assessment," leading to unreliable assessment results and low skill transfer rates among trainees. This application proposes an assessment device and method for measuring the DC resistance of distribution transformers. By acquiring operational data through a pre-set operating procedure, the measured values ​​and deviations are calculated, and then the galvanometer is adjusted using deflection feedback. This allows trainees to simulate real-world processes and resistance adjustment actions, improving their skill transfer rate. By considering deviations and operational procedures in the assessment, the reliability and accuracy of the assessment results are ensured.

[0004] To achieve the above objectives, the technical solutions adopted in the embodiments of this application are as follows: In a first aspect, embodiments of this application provide a device for measuring and evaluating the DC resistance of a distribution transformer, the method comprising: The control module triggers a preset operation process based on the target value command, calculates the measured value and measurement deviation based on the operation data, and obtains the operation score according to the operation specifications; the operation module operates the distribution transformer measurement process based on the target value command and obtains the operation data; the drive module drives the galvanometer to operate based on the measurement deviation and adjusts the target resistance based on the galvanometer deviation status to calibrate the galvanometer deflection; the auxiliary module supplies power to each module and provides indicator light responses to the status of the evaluation device and the galvanometer deflection status.

[0005] This solution replicates the traditional bridge circuit operation process through a pre-defined workflow, ensuring that the measurement process is adapted to real-world scenarios. Trainees do not need to adapt to new logic, which helps improve skill transferability and avoids the disconnect between training and actual operation, where trainees can only read data but not adjust the bridge circuit on-site. By scoring the operation process data and measurement deviations, it can accurately identify situations where operational errors occur but the results are guessed correctly, ensuring the reliability of the assessment results. At the same time, by adjusting the resistance through measurement deviation, the deflection state of the galvanometer is adjusted, overcoming the problem in traditional measurement processes where the galvanometer relies solely on deviation rather than the change in the device's own resistance, leading to a mismatch between the test scenario and the actual scenario. This further improves the authenticity, effectiveness, and skill transferability of the test.

[0006] Preferably, the control module includes: a communication submodule for bidirectional communication between the control module and the host computer to transmit target value instructions and operation data; and a microcontroller for controlling the operation module to start the distribution transformer measurement operation process according to the received target value instructions, collecting measurement signals to calculate measurement results, and generating indicator light control signals according to the operation process.

[0007] Preferably, the microcontroller includes at least: a signal transceiver unit, which receives static target resistance value and target value instructions from the host computer to trigger the operation module to run, and collects the measurement signals of the operation module in real time; and a calculation unit, which calculates the measured value and measurement deviation based on the measurement signals according to the operation scoring rules, calculates the operation score based on the measured value and measurement deviation, and generates a relay controller signal and an indicator light control signal based on the measurement deviation, sends the relay controller signal to the drive module, and sends the indicator light control signal to the auxiliary module.

[0008] Preferably, the operation module includes: a rate detection unit, comprising a five-position rotary switch, each rotary switch being connected to a first chip, and a first detection chip being connected to a first pin of the microcontroller, wherein the first detection chip is used to convert switch signals into digital signals and transmit them to the microcontroller; a step detection unit, comprising an eleven-position rotary switch, each rotary switch output being connected to a second pin of the microcontroller to transmit step signals to the microcontroller; a counting disc unit, connected to a third pin of the microcontroller via a second chip, dynamically adjusting the target resistance based on measurement requirements and transmitting resistance and voltage signals to the microcontroller; and a button unit, comprising a voltage button connected to a fourth pin of the microcontroller and a galvanometer button connected to a fifth pin of the microcontroller, the voltage button being connected to a power supply to control power-on, and the galvanometer button being connected to the drive module to control the operation of the drive unit.

[0009] Preferably, the drive module controls the direction and magnitude of the galvanometer current through the relay according to the relay controller signal, thereby realizing the forward deflection, reverse deflection and zeroing of the galvanometer, and transmits the deflection state to the computing unit to generate indicator light control signals.

[0010] Preferably, the driving module further includes: dynamically adjusting the target resistance based on the galvanometer deflection direction and the target resistance adjustment range to calibrate the galvanometer deflection.

[0011] Preferably, the auxiliary module includes: a power management submodule for providing operating power to each module; an indicator light submodule for providing corresponding light indications based on the deflection state of the galvanometer and changes in the state of the evaluation device, the changes in the state of the evaluation device including at least rate readiness and power on; and a reset submodule for resetting and restarting the control module in case of device failure.

[0012] Secondly, embodiments of this application provide a method for measuring and evaluating the DC resistance of a distribution transformer, comprising the following steps: triggering a preset operation process according to a target value instruction; calculating the measured value, measurement deviation, and operation score based on the operation data; operating the distribution transformer measurement process according to the target value instruction to obtain operation data; driving the galvanometer to operate according to the measurement deviation; adjusting the target resistance based on the galvanometer deviation status to calibrate the galvanometer deflection; and providing indicator light responses to the status of the evaluation device and the galvanometer deflection status.

[0013] Preferably, the step of triggering a preset operation process according to the target value instruction, calculating the measured value and measurement deviation based on the operation data, and obtaining the operation score according to the operation specifications includes: starting the evaluation device in parallel based on the static target resistance value and the target value instruction issued by the host computer, and starting the DC resistance measurement operation process of the distribution transformer; monitoring the DC resistance measurement operation process of the distribution transformer in real time and collecting operation data, including at least the number of rate switching times, the button operation sequence, and the target resistance adjustment value; calculating the measured value and measurement deviation based on the operation scoring rules and the operation data, and then integrating the operation data, the measured value, and the measurement deviation to obtain the assessment score.

[0014] Preferably, the step of calculating the measured value and measurement deviation based on the operation data includes: calculating the measured value based on the data of the magnification, step time, and continuation disk; and calculating the measurement deviation based on the measured value and the static target resistance value.

[0015] The beneficial effects of this application are: 1. By uniformly issuing static target resistance values ​​to trigger the operation process, the tedious operation of manually setting standard resistances in the traditional method is replaced, ensuring the standardization of assessment conditions and avoiding errors caused by manual setting. The preset operation process restores the manual operation logic of the traditional bridge circuit, which involves "selecting the multiplier - adjusting the step time - resetting the count panel to zero". At the same time, the operation data is collected to calculate the measured values ​​and measurement deviations, thereby transforming qualitative operations into quantitative data. This provides accurate process data support for assessment and scoring, ensuring the effectiveness and reliability of the assessment results. 2. By operating the scoring rules, the measured value and measurement deviation are calculated based on the measurement signal, and then the operation score is calculated based on the measured value and measurement deviation. At the same time, the indicator light is triggered to update the status, which replaces the subjectivity of traditional manual scoring, realizes the traceability of the measurement process and the quantification of the evaluation results, and improves the efficiency of the assessment. 3. Through the collaboration of various modules, the operation process of the traditional bridge can be restored. Trainees do not need to adapt to the new logic, thereby improving the skill transfer rate, which is conducive to shortening the training cycle. It solves the problem of disconnect between conventional automated devices and trainees who can only read data during training but cannot adjust the bridge on site due to the lack of manual adjustment links. Attached Figure Description

[0016] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings. The drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings.

[0017] Figure 1 This is a structural diagram of the DC resistance measurement and evaluation device module for distribution transformers provided in the embodiments of this application.

[0018] Figure 2 This is a hardware structure block diagram of the DC resistance measurement and evaluation device for distribution transformers provided in the embodiments of this application.

[0019] Figure 3 This is a simulation circuit diagram for rate detection provided in an embodiment of this application.

[0020] Figure 4 This is a step detection analog circuit diagram provided for an embodiment of this application.

[0021] Figure 5 A circuit diagram of a galvanometer drive module provided in an embodiment of this application.

[0022] Figure 6 This is a simulated circuit diagram of a sliding junction continuation disk provided in an embodiment of this application.

[0023] Figure 7 A flowchart illustrating the DC resistance measurement and evaluation method for distribution transformers provided in this application embodiment. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description of this application is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely one preferred embodiment of this application and are only used to explain this application. They do not limit the scope of protection of this application. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0025] Example 1: As Figure 1 As shown, a DC resistance measurement and evaluation device for distribution transformers includes: The control module triggers a preset operation process based on the target value instruction, calculates the measured value and measurement deviation based on the operation data, and obtains the operation score according to the operation specifications. The operation module operates the distribution transformer measurement process based on target value commands to acquire operation data; The drive module drives the galvanometer to operate based on the measurement deviation and adjusts the target resistance based on the galvanometer deviation state to calibrate the galvanometer deflection. The auxiliary module supplies power to each module and provides indicator lights to reflect the status of the evaluation device and the deflection status of the galvanometer.

[0026] In this embodiment, the on-site process of a traditional bridge is restored through a preset operation procedure, ensuring that the measurement process is adapted to the real-world work scenario. Trainees do not need to adapt to new logic, which helps improve the skill transfer rate and avoids the disconnect between training and actual operation, where trainees can only read data but not adjust the bridge on-site. By scoring the operation process data and measurement deviation, it is possible to accurately identify situations where operational errors occur but the result is guessed correctly, ensuring the reliability of the assessment results. At the same time, by adjusting the resistance through measurement deviation, the deflection state of the galvanometer is adjusted, overcoming the problem in traditional measurement processes where the galvanometer relies only on deviation rather than the change in the device's own resistance, leading to a mismatch between the test scenario and the actual scenario. This further improves the authenticity, effectiveness, and skill transfer rate of the test.

[0027] In some embodiments, combined with Figure 2 As shown, Figure 2 This is a hardware structure block diagram of a DC resistance measurement and evaluation device for distribution transformers. It mainly includes a communication module, a control module, an operation module, a galvanometer drive module, and an auxiliary module. The communication module uses a USR-C215 communication device, the control module uses an ATmega128 microcontroller, and the operation module includes a pointer-type galvanometer, a multiplier simulation unit, a stepper simulation unit, a sliding contact continuity dial simulation unit, and buttons.

[0028] In this embodiment, through the collaborative work of various modules, the traditional manual operation process is deeply integrated with automated data collection and scoring. This not only retains the core manual operation process of on-site testing, but also solves the problems of difficult data traceability, low efficiency and inaccuracy of subjective scoring in traditional assessment devices through digital collaboration. This improves the effectiveness and reliability of assessment results, and at the same time increases the skill transfer rate of trainees after training.

[0029] As an optional implementation, the control module includes: The communication submodule is used for bidirectional communication between the control module and the host computer to transmit target value commands and operation data. The microcontroller controls the operation module to start the distribution transformer measurement operation process according to the received target value instruction, collects measurement signals, calculates measurement results, and generates indicator light control signals according to the operation process.

[0030] As an optional implementation, the microcontroller includes at least: The signal transceiver unit receives the static target resistance value and target value command sent by the host computer to trigger the operation module to run, and collects the measurement signals of the operation module in real time. The calculation unit, based on the operation scoring rules, calculates the measured value and measurement deviation according to the measurement signal, calculates the operation score according to the measured value and measurement deviation, and generates a relay controller signal and an indicator light control signal according to the measurement deviation. The relay controller signal is sent to the drive module, and the indicator light control signal is sent to the auxiliary module.

[0031] Specifically, the teacher determines the static target resistance value, such as "0.0085Ω," on the host computer and issues a command. This command is transmitted via the USR-C215 communication module to the microcontroller (single-chip microcomputer) of each assessment device. The microcontroller stores the static target resistance value and sends a notification to the host computer indicating successful reception. It then sets the device to "ready," and the power and communication indicator lights on the device remain illuminated. After confirming the target resistance value, the student performs the operation through the operation module. The microcontroller collects and calculates the measured values ​​and measurement errors in real time, transmitting this data to the host computer to calculate the assessment results according to the operation scoring rules.

[0032] Specifically, the measured value = magnification × (step time + number of repetitions); the deviation rate = (measured value - target value) / target value × 100%.

[0033] As an optional implementation, the operation module includes: The rate detection unit includes a five-position rotary switch, each rotary switch being connected to a first chip. The first detection chip is connected to a first pin of the microcontroller. The first detection chip is used to convert the switch signal into a digital signal and transmit it to the microcontroller. The timing detection unit includes eleven rotary switches, the output of each rotary switch being connected to the second pin of the microcontroller to transmit timing signals to the microcontroller; The counting unit is connected to the third pin of the microcontroller via a second chip. It dynamically adjusts the target resistance based on measurement requirements and transmits the resistance signal and voltage signal to the microcontroller. The button unit includes a voltage button connected to the fourth pin of the microcontroller and a galvanometer button connected to the fifth pin of the microcontroller. The voltage button is connected to the power supply to control the power supply to be turned on, and the galvanometer button is connected to the drive module to control the operation of the drive unit.

[0034] As an optional implementation, the drive module controls the direction and magnitude of the galvanometer current through a relay based on the relay controller signal, thereby realizing the forward deflection, reverse deflection, and zeroing of the galvanometer, and transmits the deflection state to the computing unit to generate indicator light control signals.

[0035] Specifically, during the trainees' testing process, the multiplier is selected based on the static target resistance value, the step time is adjusted, and the target resistance value is dynamically adjusted via the count dial based on the galvanometer deflection.

[0036] In some embodiments, combined with Figure 3 As shown, Figure 3 This is a circuit diagram for a magnification detection simulation. In the diagram, BL (0.01 / 0.1 / 1 / 10 / 100) is a 5-position rotary switch. PD0, PD5, and PD6 are the first pins of the microcontroller (i.e., the microcontroller's general purpose input / output pins). The first chip of the magnification detection unit is a 74HC165 chip. The 5-position rotary switch is connected to the SER pin of the first chip, and the Q7 pin of the 74HC165 chip is connected to the PB0 pin of the microcontroller. The microcontroller receives the magnification position signal output by the first chip through the PD0 pin, sends a synchronization clock to the first chip through the PD5 pin to control the first chip to convert the parallel magnification position signal bit by bit into a serial signal for PD0 to read, and sends a load command to the first chip through the PD6 pin to control the first chip to latch the current rotary switch position signal, avoiding errors caused by switch bounce during signal acquisition.

[0037] When selecting the magnification, turn the rotary switch to the 0.1 position according to the target resistance value. The microcontroller collects the position signal, and the corresponding indicator light (magnification ready) lights up. Press the voltage button, and the microcontroller starts to collect step or count data through the first pin. The corresponding power-on indicator light lights up.

[0038] In some embodiments, combined with Figure 4 As shown, Figure 4 This is a step-by-step detection analog circuit diagram. In the diagram, BU_JI (-0.1 / -0.09 / 0.08 / 0.07 / 0.06 / 0.05 / 0.04 / 0.03 / 0.02 / 0.01 / -0) represent 11-position rotary switches. Combined with... Figure 5 As shown, Figure 5 This is a circuit diagram of a galvanometer driver module, which includes an ATMEGA128A microcontroller, a control relay K1 (the control terminal of relay K1 is connected to the PD4 pin of the microcontroller (the third pin of the microcontroller), and the output terminal is connected to the power supply terminal of the galvanometer), a pointer galvanometer, a digital-to-analog converter chip, and a P4 interface for connecting an external adjustable resistor; based on the deviation rate, the digital-to-analog converter module converts the galvanometer signal into an analog signal to control the deflection of the pointer galvanometer.

[0039] It should be noted that in this embodiment, the fourth pin of the microcontroller is the PD2 pin, which is connected to the voltage button, and the fifth pin is the PD3 pin, which is connected to the galvanometer button.

[0040] Furthermore, combined Figure 6 As shown, Figure 6 This is a schematic diagram of a sliding contact number disk analog circuit, including a P5 interface for connecting an external adjustable resistor (0~0.01Ω), an ADS1115IDGSR analog-to-digital converter chip, a +3.3V power supply, GND, resistors, and capacitors to the third pin of the microcontroller.

[0041] Specifically, during step adjustment: Set the step time switch to the 0.08Ω position. The microcontroller acquires the signal from the second pin and calculates the step time reading as 0.08Ω. At this time, the measured value is temporarily 0.1×0.08=0.008Ω. Press the galvanometer button. The microcontroller detects the signal from the third pin and calculates the measurement deviation rate = (0.008-0.0085) / 0.0085×100% = -5.88%. At this time, the control relay K1 in the galvanometer driver module is not closed, and a positive current of 5.88μA is output. The galvanometer deflects in the forward direction, and the corresponding galvanometer forward deflection indicator light illuminates. The trainee observes the deflection of the galvanometer and rotates the adjustable resistor clockwise to 0.005Ω. The ADS1115IDGSR analog-to-digital converter chip collects the resistor voltage and converts it into a reading of 0.005Ω on the dial. At this time, the microcontroller calculates the measured value = 0.1×(0.08+0.005)=0.0085Ω, the deviation rate = 0%, controls the relay K1 to de-energize, the galvanometer returns to zero, and the corresponding galvanometer zeroing indicator lights up.

[0042] In this embodiment, trainees manually operate the module using the "multiplier switch, step time switch, countdown dial, and buttons." Each unit converts the operation signals into electrical signals in real time. For example, the 74HC165 converts the multiplier switch signal into a digital signal, and the ADS1115 converts the countdown dial resistance signal into an analog signal. These signals are transmitted to the microcontroller to calculate the measured values ​​and measurement deviation rate. This fully replicates the manual operation logic of selecting the multiplier, adjusting the step time, and zeroing the countdown dial in a traditional bridge circuit. Compared to the shortcomings of traditional automated devices that "omit the manual adjustment step," this avoids the disconnect between trainees who can only read data during training and those who cannot adjust the bridge circuit on-site. Trainees do not need to adapt to new logic and can directly use the equipment in the field after passing the assessment, significantly improving the skill transfer rate.

[0043] As an optional implementation, the driving module further includes: Based on the galvanometer deflection direction, the target resistance is dynamically adjusted according to the target resistance adjustment range to calibrate the galvanometer deflection.

[0044] It should be noted that the core testing principle of traditional single-arm / double-arm bridges (such as the QJ44 type) is to adjust the resistance to bring the galvanometer to zero, thereby matching the measured value with the standard value. In other words, the galvanometer returning to zero signifies that the bridge has reached a balanced state, and only then is the measured value accurate. Therefore, in this embodiment, trainees must first observe the galvanometer deflection direction to determine the relationship between the measured value and the target value. For example, a positive deflection indicates "measured value < target value." Then, the adjustable resistance of the sliding contact continuum dial is finely adjusted in the reverse direction to ultimately achieve zero. This allows trainees to master the core judgment method for on-site testing, rather than relying on mechanical readings, thus solving the training deficiency of existing automated devices where trainees only read data and do not understand the adjustment principles.

[0045] It should also be noted that the zeroing adjustment step in this embodiment requires the trainee to fully demonstrate the entire process of observing the deflection, judging the direction, fine-tuning and correcting, and zeroing verification. That is, the device collects the fine-tuning amount of the dial through the ADS1115 chip and records the number and sequence of adjustments through the microcontroller. If the trainee does not adjust according to the deflection logic (such as the deflection direction contradicting the adjustment direction), even if it is finally zeroed, the process score will be deducted due to "non-compliance with operational standards". This upgrades the assessment from "only looking at the result" to a dual verification of "process + result", ensuring that the trainee can really operate the device.

[0046] The automatic scoring process includes: the microcontroller collecting operation data during the cycle period, including at least the rate switching, button sequence (e.g., voltage button -> galvanometer button), step time, countdown dial, and measured value, and transmitting it to the host computer. The host computer obtains a comprehensive score based on the scoring rules: (operation standard score: e.g., rate + button + adjustment sequence) + deviation rate.

[0047] Understandably, the comprehensive score obtained based on the dual verification logic can accurately determine whether the trainee's operation is standardized, avoid the one-sided assessment that only looks at the result, ensure that the evaluation is comprehensive and objective, and thus guarantee the reliability and authenticity of the evaluation results.

[0048] As an optional implementation, the auxiliary module includes: The power management submodule is used to provide operating power to each module; The indicator light submodule illuminates the light accordingly based on the deflection state of the galvanometer and the changes in the status of the evaluation device. The changes in the status of the evaluation device include at least the multiplier readiness and power on. The reset submodule is used to reset and restart the control module in the event of a device failure.

[0049] In this embodiment, the power management submodule and reset submodule ensure the stable operation of the core components of the assessment device under long-term, high-frequency operation, avoiding problems such as power supply failure and operation interruption, and are compatible with assessment requirements of different voltage levels. The operation process status is visualized by indicator lights, which can intuitively obtain the progress of the trainees' operation process, thereby improving the monitoring efficiency when multiple people are assessed in batches, further improving the scene adaptability, and solving the problems of unstable operation, cumbersome operation and poor scene adaptability of conventional automated devices.

[0050] Example 2, as Figure 7 As shown, the method for measuring and evaluating the DC resistance of a distribution transformer includes the following steps: S1. Trigger the preset operation process according to the target value instruction, calculate the measured value and measurement deviation based on the operation data, and obtain the operation score according to the operation specifications; S2. Based on the target value command, operate the distribution transformer measurement process to obtain operation data; S3. Drive the galvanometer to operate based on the measurement deviation, and adjust the target resistance based on the galvanometer deviation state to calibrate the galvanometer deflection; S4. Indicator lights respond to the status of the evaluation device and the deflection status of the galvanometer.

[0051] As an optional implementation, the step of triggering a preset operation process based on the target value instruction, calculating the measured value and measurement deviation based on the operation data, and obtaining an operation score according to the operation specifications includes: Based on the static target resistance value and target value command issued by the host computer, the evaluation device is started in parallel, and the DC resistance measurement operation process of the distribution transformer is initiated. The operation process of measuring the DC resistance of the distribution transformer is monitored in real time, and operation data is collected, including at least the number of rate switching times, button operation sequence, and target resistance adjustment value. Based on the operation scoring rules, the measured value and measurement deviation are calculated according to the operation data, and then the operation data, measured value and measurement deviation are integrated to obtain the assessment score.

[0052] As an optional implementation, the step of calculating the measured value and measurement deviation based on the operational data includes: The measured value is calculated based on the magnification, step time, and continuation count data; The measurement deviation is calculated based on the measured value and the static target resistance value.

[0053] In this embodiment, the operation scoring rules are formulated through operation specifications. By triggering preset operation procedures based on target value instructions, the traditional method of manually setting assessment conditions is replaced, ensuring that the assessment benchmarks of all trainees are consistent, avoiding deviations in assessment conditions caused by manual operation, and ensuring the fairness of the assessment. The operation scoring rules replace subjective manual scoring, ensuring that the scoring is objective and traceable. By calculating and measuring deviations, fine-tuning of the number plate is possible, thus solving the shortcomings of traditional assessments that only look at the results and ignore the process, ensuring that trainees master real skills. At the same time, by combining deviations with operation process data for scoring, scenarios where improper operation is used but the number plate result is guessed can be identified. Even if the measurement deviation is 0%, points will be deducted for failure to meet the operation specifications, ensuring the reliability and authenticity of the assessment results, and further improving the efficiency and accuracy of the assessment.

[0054] The above-described embodiments are preferred embodiments of this application and are not intended to limit the specific scope of this application. The scope of this application includes but is not limited to the specific embodiments described above. All equivalent changes made in accordance with the shape, structure, and method of this application are within the protection scope of this application.

Claims

1. A DC resistance measurement and evaluation device for distribution transformers, characterized in that: include: The control module triggers a preset operation process based on the target value instruction, calculates the measured value and measurement deviation based on the operation data, and obtains the operation score according to the operation specifications. The operation module operates the distribution transformer measurement process based on target value commands to acquire operation data; The drive module drives the galvanometer to operate based on the measurement deviation and adjusts the target resistance based on the galvanometer deviation state to calibrate the galvanometer deflection. The auxiliary module supplies power to each module and provides indicator lights to reflect the status of the evaluation device and the deflection status of the galvanometer.

2. The DC resistance measurement and evaluation device for distribution transformers according to claim 1, characterized in that: The control module includes: The communication submodule is used for bidirectional communication between the control module and the host computer to transmit target value commands and operation data. The microcontroller controls the operation module to start the distribution transformer measurement operation process according to the received target value instruction, collects measurement signals, calculates measurement results, and generates indicator light control signals according to the operation process.

3. The DC resistance measurement and evaluation device for distribution transformers according to claim 2, characterized in that: The microcontroller includes at least: The signal transceiver unit receives the static target resistance value and target value command sent by the host computer to trigger the operation module to run, and collects the measurement signals of the operation module in real time. The calculation unit, based on the operation scoring rules, calculates the measured value and measurement deviation according to the measurement signal, calculates the operation score according to the measured value and measurement deviation, and generates a relay controller signal and an indicator light control signal according to the measurement deviation. The relay controller signal is sent to the drive module, and the indicator light control signal is sent to the auxiliary module.

4. The DC resistance measurement and evaluation device for distribution transformers according to claim 2, characterized in that: The operation module includes: The rate detection unit includes a five-position rotary switch, each rotary switch being connected to a first chip. The first detection chip is connected to a first pin of the microcontroller. The first detection chip is used to convert the switch signal into a digital signal and transmit it to the microcontroller. The timing detection unit includes eleven rotary switches, the output of each rotary switch being connected to the second pin of the microcontroller to transmit timing signals to the microcontroller; The counting unit is connected to the third pin of the microcontroller via a second chip. It dynamically adjusts the target resistance based on measurement requirements and transmits the resistance signal and voltage signal to the microcontroller. The button unit includes a voltage button connected to the fourth pin of the microcontroller and a galvanometer button connected to the fifth pin of the microcontroller. The voltage button is connected to the power supply to control the power supply to be turned on, and the galvanometer button is connected to the drive module to control the operation of the drive unit.

5. The DC resistance measurement and evaluation device for distribution transformers according to claim 3, characterized in that: The drive module controls the direction and magnitude of the galvanometer current through the relay controller signal, thereby realizing the forward deflection, reverse deflection and zeroing of the galvanometer, and transmits the deflection status to the calculation unit to generate indicator light control signals.

6. The DC resistance measurement and evaluation device for distribution transformers according to claim 1, characterized in that: The driver module also includes: Based on the galvanometer deflection direction, the target resistance is dynamically adjusted according to the target resistance adjustment range to calibrate the galvanometer deflection.

7. The DC resistance measurement and evaluation device for distribution transformers according to claim 1, characterized in that: The auxiliary module includes: The power management submodule is used to provide operating power to each module; The indicator light submodule illuminates the light accordingly based on the deflection state of the galvanometer and the changes in the status of the evaluation device. The changes in the status of the evaluation device include at least the multiplier readiness and the power on. The reset submodule is used to reset and restart the control module in the event of a device failure.

8. A method for measuring and evaluating the DC resistance of a distribution transformer, applicable to the DC resistance measurement and evaluation device for distribution transformers as described in any one of claims 1-7, characterized in that: Includes the following steps: The preset operation process is triggered according to the target value instruction, and the measured value and measurement deviation are calculated based on the operation data, and the operation score is obtained according to the operation specifications. The operation process of the distribution transformer is based on the target value command to obtain operation data; The galvanometer is driven to operate based on the measurement deviation, and the target resistance is adjusted based on the galvanometer deviation state to calibrate the galvanometer deflection. Indicator lights respond to the status of the evaluation device and the deflection status of the galvanometer.

9. The method for measuring and evaluating the DC resistance of a distribution transformer according to claim 8, characterized in that: The process of triggering a preset operation flow based on a target value instruction, calculating measured values ​​and measurement deviations based on operation data, and obtaining an operation score according to operation specifications includes: Based on the static target resistance value and target value command issued by the host computer, the evaluation device is started in parallel, and the DC resistance measurement operation process of the distribution transformer is initiated. The operation process of measuring the DC resistance of the distribution transformer is monitored in real time, and operation data is collected, including at least the number of rate switching times, button operation sequence, and target resistance adjustment value. Based on the operation scoring rules, the measured value and measurement deviation are calculated according to the operation data, and then the operation data, measured value and measurement deviation are integrated to obtain the assessment score.

10. The method for measuring and evaluating the DC resistance of a distribution transformer according to claim 9, characterized in that: The step of calculating the measured value and measurement deviation based on the operation data includes: The measured value is calculated based on the magnification, step time, and continuation count data; The measurement deviation is calculated based on the measured value and the static target resistance value.

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