Harmonic performance tester for electronic voltage transformer

Abstract

The invention provides a harmonic performance tester for an electronic voltage transformer. The harmonic performance tester comprises a voltage regulator T1 of which the input side is connected with apower frequency test power supply, a single-phase boosting transformer T2 which is connected to the output side of the T1 and is used for boosting power supply voltage to test voltage, a capacitive voltage divider, a to-be-detected voltage transformer and a single-phase step-down transformer T3 which are connected to the output side of the T2 in parallel, a measuring device which is connected tothe low-voltage ends of the capacitive voltage divider and the to-be-detected voltage transformer, and a single-phase full-control rectifier bridge load which is connected to the output side of the T3. According to the harmonic characteristic detection method for the electronic voltage transformer, the harmonic source part can generate a primary voltage capable of simulating superposition of a rated voltage of a real power grid harmonic voltage and each harmonic voltage, and the detection device can detect the frequency characteristic of the electronic voltage transformer for each harmonic voltage, thereby realizing accurate measurement of the harmonic voltage in the power system.

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 an electronic voltage transformer harmonic performance tester , its harmonic source part can generate a primary voltage that can simulate the real grid harmonic voltage superimposed with the rated voltage and each harmonic voltage, and its detection device can measure the frequency characteristics of the electronic voltage transformer for each harmonic voltage , to achieve accurate measurement of harmonic voltages in power systems

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