Electronic voltage transformer harmonic characteristic detection method and its detection device

Abstract

The invention provides a detection method of the harmonic characteristic of an electronic voltage transformer and a detection device thereof, and the detection device comprises a voltage regulator T1, a single-phase step-up transformer T2, a capacitive voltage divider, the voltage transformer to be detected, a single-phase step-down transformer T3, a measuring device and a single-phase full-controlled rectifier bridge load, wherein the input side of the voltage regulator T1 is connected with a power frequency testing power supply, the single-phase step-up transformer T2 is connected with the output side of the T1 and used for stepping up the voltage of the power supply to the testing voltage, the capacitive voltage divider, the voltage transformer to be detected and the single-phase step-down transformer T3 are connected with the output side of the T2 in parallel, the measuring device is connected with the capacitive voltage divider and the voltage transformer to be detected, and the single-phase full-controlled rectifier bridge load is connected with the output side of the T3. By adopting the detection method of the harmonic characteristic of the electronic voltage transformer provided by the invention, the harmonic source part can generate a primary voltage capable of simulating the superposition of a rated voltage of a harmonic voltage of a real power grid and all orders ofthe harmonic voltages, the detection device can detect the frequency characteristic of the electronic voltage transformer to all the orders of the harmonic voltages and then accurate measurement of the harmonic voltages in a power system can be further realized.

Description

technical field [0001] The invention relates to a method for detecting harmonic characteristics of an electronic voltage transformer and a detection device thereof, belonging to the technical field of electric power measurement, and in particular to a method capable of accurately detecting the harmonic characteristics of an electronic voltage transformer, and finally realizing the detection of the harmonic voltage. A detection method for accurate measurement and a detection device thereof. Background technique [0002] At present, with the continuous increase of non-linear loads, the harmonic problem in the power system is becoming more and more serious, which has a very significant impact on electric energy metering, causing many problems such as metering mode, metering algorithm, and increasing the metering error of existing metering devices. question. In addition to the factors that the harmonic active power is not zero, the main cause of these problems is the difference...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is: In order to solve the problem that the current harmonic characteristic detection of electronic voltage transformer lacks effective detection methods and detection devices, the present invention provides a harmonic characteristic detection of electronic voltage transformer method, its harmonic source part can generate a primary voltage that can simulate the rated voltage of the real power grid harmonic voltage and the superposition of each harmonic voltage, and its detection device can measure the frequency of each harmonic voltage of the electronic voltage transformer characteristics, to achieve accurate measurement of harmonic voltages in power systems

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