Higher Harmonic Generator for Smart Energy Meter Detection

Abstract

The invention relates to a high-order harmonic generator for intelligent electric energy meter detection. The high-order harmonic generator comprises a signal generator, a transformer T1, an input-stage circuit, a capacitor C1, a capacitor C2, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R411, an amplifier A6, a voltage amplifying circuit, a power amplifying circuit, a transformer T2, a transformer T3, a current transformer TA1, a voltage transformer TV1, a switch S1, a rectification feedback circuit, a comparison circuit, a photoelectric isolation unit, a triode Q1 and a voltage-stabilizing diode D1. According to the invention, required harmonic signals are generated by the signal generator, and the frequency balance amplification is carried out onthe harmonic signals. Therefore, the amplitude of each sub-harmonic amplification output is ensured to be consistent. The direct-current feedback and the alternating-current feedback are introduced through the rectification feedback circuit, so that signals can be rapidly and accurately adjusted. The high-order harmonic generator can be applied to the high-order harmonic test of an intelligent electric energy meter.

Description

technical field [0001] The invention belongs to the technical field of electric energy measurement, and in particular relates to a high-order harmonic generator used for detection of an intelligent electric energy meter. [0002] technical background [0003] All kinds of non-linear electrical equipment, transformers and various core reactors are harmonic sources in the power grid. With the increase of the capacity of various harmonic sources, more and more attention has been paid to the influence of harmonics on electric energy metering. At present, my country's electric energy meter standard GB / T17215 stipulates the method and requirements of the test of the harmonic influence of the electric energy meter, but the harmonic test waveform proposed cannot fully reflect the actual field operating conditions of the electric energy meter. [0004] The R46 electric energy meter international proposal formulated by the International Legal Metrology Organization and the European el...

AI Technical Summary

Problems solved by technology

[0005] The existing harmonic generators have different amplification characteristics of built-in amplifiers under different frequency signals, and the power supply itself lacks closed-loop control for monitoring output voltage and current signals, so that the amplitude of each harmonic cannot reach the set value. value

During the test, the test signal waveform will be distorted, which will affect the test results of the harmonic influence test of the electric energy meter

Images