Search

CN-121348214-B - Calibration test method for single-phase ammeter

CN121348214BCN 121348214 BCN121348214 BCN 121348214BCN-121348214-B

Abstract

The invention relates to the technical field of measurement and calibration, in particular to a calibration and test method of a single-phase ammeter, which comprises the following steps: and acquiring a current target value, identifying an output fluctuation trend, judging and adjusting to stable output, extracting a pulse sequence analysis error response, positioning an error stable point compression test point, constructing a beat response sequence chain, and generating a calibration test time sequence control instruction set by pushing a beat starting moment. According to the invention, by introducing a current trend stability recognition and adjustment mechanism in the signal output process, the interference of initial fluctuation on a measurement result is avoided, the high-sensitivity recognition of the electric energy output abnormal section is realized by accurately positioning an error response section, the representative test points are extracted by combining the error change trend, the beat overlapping interference is eliminated by time lapse adjustment, the coordination and unification of time sequences among multiple test points are realized, and the requirements on the consistency and stability of the error calibration of the electric energy metering device under the working condition are met.

Inventors

  • WANG QIANG
  • BAI HAO
  • Tan Wendong
  • Lv Ningke
  • LIU YANG

Assignees

  • 昀诺能源科技(江苏)有限公司

Dates

Publication Date
20260505
Application Date
20251222

Claims (7)

  1. 1. The calibration test method of the single-phase ammeter is characterized by comprising the following steps of: S1, acquiring a signal source set current target value, acquiring a plurality of continuous instantaneous current output values in a continuous output period in a standard voltage maintaining state, and identifying whether continuous rising or falling behaviors exist in an output waveform according to a sequential offset trend among sampling points to obtain a stable current output section identifier; S2, calling the voltage, current and load working condition states in the period corresponding to the stable current output section identifier, extracting an electric energy pulse sequence and a time stamp output by the single-phase ammeter, calculating the interval difference amplitude between adjacent pulses, and obtaining an error response sensitive section sequence, wherein the obtaining steps specifically comprise: s211, calling an electric energy pulse sequence and a corresponding time stamp based on a voltage value, a current value and a load working condition state in a period corresponding to the stable current output section mark, sequentially comparing adjacent electric energy pulse time difference values, acquiring interval variation among the time difference values, judging whether the variation direction and variation amplitude of the interval variation in the adjacent time period continuously keep the same variation trend, and generating a time difference fluctuation trend value; S212, according to the time difference fluctuation trend value, amplitude sequencing is carried out on fluctuation trend variation amplitude in a differential time period, pulse time difference values in the same trend in the time difference fluctuation trend value are called, response deviation values of trend intervals are calculated, and according to distribution density changes of the response deviation values in the whole intervals, the trend concentrated deviation degree is obtained; s213, calling the trend concentrated offset, screening a front-back stable time period of a trend concentrated offset mutation point according to the distribution difference of the trend concentrated offset in a fluctuation and continuous area, and carrying out interval combination according to the trend direction consistency and offset fluctuation to generate an error response sensitive section sequence; S3, selecting an error fluctuation center position point as a representative test point based on an error upper boundary interval and an error lower boundary interval under a voltage-current combined working condition positioned by the error response sensitive section sequence, and obtaining a compressed test point list; And S4, calling the compressed test point list, extracting impulse response starting time, voltage signal triggering time and current stable triggering starting time of the test point, and comparing the voltage signal triggering time, the current stable triggering starting time and the impulse response starting time successively to obtain a test beat response sequence chain.
  2. 2. The calibration test method of the single-phase ammeter according to claim 1, wherein the stable current output section mark comprises a current change trend characteristic, a fluctuation direction consistency parameter and an output waveform stability index, the error response sensitive section sequence comprises an electric energy pulse interval fluctuation range, a load fluctuation mapping relation and a time sequence response sensitivity characteristic, the compressed test point list comprises an error center point position, a voltage current stable combination point position and a response behavior representative index, and the test beat response sequence chain comprises a beat trigger type mark, a time sequence label and response stage attribution information.
  3. 3. The method for calibrating and testing a single-phase electric meter according to claim 1, wherein the step of obtaining the stable current output section identifier comprises the following steps: S111, acquiring a signal source set current target value, sequentially acquiring a plurality of continuous instantaneous current output values according to a continuous output period in a standard voltage maintenance state, recording a sequential offset trend among data points, and identifying whether current shows continuous rising or falling behaviors by monitoring the change trend of the data points to obtain a fluctuation trend identification result; And S112, based on the fluctuation trend identification result, comparing the instantaneous current output values, judging whether a stable output state exists, if the existence of the fluctuation behavior with the consistent direction is detected, carrying out signal adjustment on the output waveform, carrying out quantitative analysis on the signal fluctuation condition in the section, calculating the stability measurement value of the current, and obtaining the stable current output section identification.
  4. 4. The method for calibrating and testing a single-phase electric meter according to claim 1, wherein the step of obtaining the compressed test point list comprises the following steps: s311, calling error upper and lower boundary interval data corresponding to the combined working condition point positions based on the voltage and current combined working condition point positions positioned by the error response sensitive section sequence, and processing the error upper and lower boundary values of the point positions to generate an error boundary interval width sequence; S312, calling the error boundary interval width sequence, comparing the difference value of adjacent error boundary interval widths in the combined point positions according to the boundary interval width change condition of the adjacent combined working condition point positions, judging whether a section with the continuous error boundary interval width change value lower than an error change critical value exists or not, and counting the number of the continuous point positions of the section and the corresponding section range to obtain an error stable section identification result; s313, according to the error stability interval identification result, calculating an error fluctuation measurement value in the error stability section according to an error boundary upper limit value and an error boundary lower limit value pair in the stability section, and selecting a corresponding voltage and current combination working condition point as a representative test point according to a low valley point position of the error fluctuation measurement value in the stability section to obtain a compressed representative test point list.
  5. 5. The method for calibrating and testing a single-phase electric meter according to claim 4, wherein the step of obtaining the test beat response sequence chain comprises the following steps: s411, calling the compressed representative test point list, extracting impulse response starting time, voltage signal triggering time and current stable triggering starting time recorded in a test point, establishing a time sequence arrangement index for each test point according to the three extracted time sequence data, screening the time position of the impulse response starting time as a reference time point corresponding to the test point, and generating an impulse starting reference time sequence; s412, according to the reference time points of the test points in the pulse starting reference time sequence, comparing the corresponding voltage signal trigger time and current stable trigger start time in turn, judging whether the pulse response start time is earlier than the voltage trigger time and the current trigger start time, if yes, marking the test points as beat main trigger points, and generating a beat main trigger point marking sequence; s413, calling the main trigger point marking sequence of the beats, sorting the corresponding main trigger points according to the time index in the pulse starting reference time sequence, respectively delaying the voltage signal triggering time and the rest points marked by the current stable triggering starting time of the corresponding test points, and identifying the complete test beat sequence relation to obtain a test beat response sequence chain.
  6. 6. The method for calibration testing of a single-phase electric meter according to claim 1, characterized in that it further comprises the step S5 of: S5, extracting beat interval sections of adjacent points based on the triggering sequence and execution duration of test points in the test beat response sequence chain, detecting whether time coverage in the beat sections is crossed or not, and if so, performing time shifting processing on the start time of test points to obtain a calibration test time sequence control instruction set; The calibration test time sequence control instruction set comprises a beat synchronization strategy parameter, a time lapse compensation value and a conflict section adjustment result.
  7. 7. The method for calibrating and testing a single-phase electric meter according to claim 6, wherein the step of obtaining the calibration and testing time sequence control instruction set specifically comprises: S511, extracting the sum of the pulse starting time of two adjacent test points, the starting time and the duration time of the test points based on the triggering sequence of the test points in the test beat response sequence chain and the corresponding execution duration time, calculating the time difference between the two, judging whether the section superposition condition exists or not according to the difference value, and generating beat time cross identification sections; S512, calling test point location data with cross behaviors in the beat time cross identification section, and respectively carrying out equal time interval time shifting processing on pulse starting time to obtain a calibration test time sequence control instruction set for the test points with starting time earlier than the point location and duration time covered to the test points before starting.

Description

Calibration test method for single-phase ammeter Technical Field The invention relates to the technical field of measurement and calibration, in particular to a calibration and test method of a single-phase ammeter. Background The technical field of measurement calibration mainly relates to a technical means and an operation method for carrying out accuracy assessment and error correction on various measuring equipment, instruments, meters and the like, and the technical means and the operation method comprise the establishment and transmission of a reference instrument, the error measurement and adjustment of tested equipment, the recording and comparison of measured data and the like. The technical field covers the calibration operation of measuring equipment such as an electric parameter measuring instrument, a thermal parameter measuring instrument, a length and angle measuring device and the like, and the performance index of the equipment is checked according to industry standards, so that the accuracy and traceability of the magnitude of the equipment are ensured. The field has basic technical support function in the scenes of energy metering, manufacturing detection, scientific research experiments and the like. The calibration test method of the traditional single-phase electric meter is a technical means for verifying accuracy and checking metering performance of single-phase electric energy metering devices widely used by residents or industrial users, and aims at solving the problems of error confirmation and adjustment between the electric quantity displayed by the electric meter in a rated running state and the standard electric quantity. The traditional calibration test adopts an electrical parameter standard source to provide specific voltage, current and power factor signals, and uses a standard source signal to simulate a load and an ammeter pulse output acquisition device to test and verify, judge the error according to the pulse count or time interval, and periodically correct the metering characteristics. The prior art relies on a fixed electrical parameter standard source to output voltage and current signals, current fluctuation trend in the actual output process is not judged and regulated, error deviation is easy to occur when data is acquired in a signal unstable stage, interference overlapping among test points is caused due to lack of accurate time sequence control in the response process of an ammeter output pulse, error judgment is difficult to accurately position to specific working condition points, especially when load change is frequent or ammeter response is delayed, pulse interval judgment deviation is increased, repeatability and effectiveness of test data are affected, clear error boundary recognition results are not formed, and efficiency and accuracy of integral calibration test are reduced. Disclosure of Invention The invention aims to solve the defects in the prior art, and provides a calibration test method of a single-phase ammeter. In order to achieve the above purpose, the invention adopts the following technical scheme that the calibration test method of the single-phase ammeter comprises the following steps: S1, acquiring a signal source set current target value, acquiring a plurality of continuous instantaneous current output values in a continuous output period in a standard voltage maintaining state, and identifying whether continuous rising or falling behaviors exist in an output waveform according to a sequential offset trend among sampling points to obtain a stable current output section identifier; S2, calling the voltage, current and load working condition states in the period corresponding to the stable current output section mark, extracting an electric energy pulse sequence and a time stamp output by the single-phase ammeter, and calculating the interval difference amplitude between adjacent pulses to obtain an error response sensitive section sequence; S3, selecting an error fluctuation center position point as a representative test point based on an error upper boundary interval and an error lower boundary interval under a voltage-current combined working condition positioned by the error response sensitive section sequence, and obtaining a compressed test point list; And S4, calling the compressed test point list, extracting impulse response starting time, voltage signal triggering time and current stable triggering starting time of the test point, and comparing the voltage signal triggering time, the current stable triggering starting time and the impulse response time successively to obtain a test beat response sequence chain. As a further scheme of the invention, the stable current output section mark comprises a current change trend feature, a fluctuation direction consistency parameter and an output waveform stability index, the error response sensitive section sequence comprises an electric energy pulse interval fluctuation range, a load fl