Conventional electric energy calibrator-based dynamic performance tracing method

Abstract

A conventional electric energy calibrator-based dynamic performance tracing method is disclosed and comprises the following steps: (1) a standard device which is 0.01 grade in accuracy class in a steady state test signal condition is chosen; (2) 0.05 grade high precision three phase standard electric energy meter without any automatic measuring range switching function is chosen as a 0.05 grade conventional electric energy calibrator; (3) in the steady state test signal condition, the 0.01 grade standard device is used for subjecting the 0.05 grade conventional electric energy calibrator to conventional calibration, and that the 0.05 grade conventional electric energy calibrator meets requirements for steady state indexes is ensured; (4) a 0.1 grade electric energy meter dynamic performance measurement device which needs to be calibrated is chosen; (5) in a dynamic test signal condition, the 0.05 grade conventional electric energy calibrator is used for calibrating dynamic performanceaccuracy indexes of electric energy meter dynamic performance measurement devices which are 0.1 grade and less than 0.1 grade in accuracy class via electric energy comparison; (6) in the dynamic testsignal condition, the calibrated electric energy meter dynamic performance measurement devices are used for calibrating the dynamic performance accuracy indexes of a detected electric energy meter.

Description

technical field [0001] The invention relates to a dynamic performance traceability method based on a conventional electric energy calibrator, which belongs to the technical field of electric energy measurement. Background technique [0002] Under the current energy value traceability system, the verification and verification of electric energy meters all use steady-state signals as test signals. The measurement is performed after the signal reaches the set value and is stable, and the verification result only reflects the steady-state performance index of the electric energy meter. In order to ensure the accurate measurement of the electric energy meter in the dynamic signal environment of some nonlinear loads, it is necessary to develop and adopt the dynamic performance measurement device of the electric energy meter to assess the dynamic performance index of the electric energy meter. In order to ensure the accurate and compliant use of the measuring device, it is necess...

AI Technical Summary

Problems solved by technology

[0003] In the study of the dynamic characteristics of electric energy meters, the dynamic load electric energy signal commonly used in the dynamic measurement performance test of electric energy meters is directly generated by the power signal source. This method of generating dynamic load electric energy signals lacks the traceability of the dynamic measurement performance of electric energy meters. , it is impossible to give the measurement traceability error; some scholars have proposed a method of measuring the dynamic error of the electric energy meter, using the sinusoidal envelope power frequency signal and the trapezoidal envelope power frequency signal as the dynamic conditions, through the combination of source meters, multi-parameters, and multi-instrument measurement The method of mutual checking, inspecting the characteristics of the existing standard power (electric energy) meter under dynamic conditions, initially obtained an uncertainty estimate of 3.0%. This test method has certain limitations

[0004] The Chinese invention patent with application number 201310023075.7, authorized announcement number 103091659, and authorized announcement date 2015.02.11 discloses a mathematical model of dynamic excitation signal and calculation of dynamic error under synchronous on-off control signal OOK control mode However, this method has the following disadvantages: ①The dynamic signal cannot be constructed arbitrarily according to the needs; ②OOK control uses power electronic devices such as silicon controlled rectifiers to realize the shutdown of the control signal. Delay and leakage. At this time, there is a large difference between the theoretical value and the actual value of the dynamic load electric energy calculated, so the traceability accuracy of the calculation is not high

[0005] Therefore, the existing value traceability equipment and technical means cannot well solve the traceability problem of electric energy measurement under dynamic load conditions.

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