Method and device for detecting harmonic characteristic of electronic current transformer

Abstract

The invention provides a method and a device for detecting harmonic characteristic of an electronic current transformer. The device comprises a voltage regulator T1, a single-phase step-down transformer T2, a current transformer to be detected, a coaxial shunt, single-phase full-control rectifier bridge load and a measuring device, wherein, an input side of the voltage regulator T1 is connected with a power-frequency test power supply; the single-phase step-down transformer T2 is connected with an output side of the voltage regulator T1 and is used for reducing power supply voltage; the current transformer to be detected, the coaxial shunt and the single-phase full-control rectifier bridge load are connected in series with an output side of the single-phase step-down transformer T2; and the measuring device is connected with output ends of the current transformer to be detected and the coaxial shunt. In the method for detecting the harmonic characteristic of the electronic current transformer, a harmonic source part can generate rated current capable of simulating real power grid harmonic current as well as primary current formed by superposing each harmonic current; and the device can detect the frequency characteristic of the electronic current transformer for each harmonic current so as to realize accurate measurement of the harmonic current in a power system.

Description

technical field [0001] The invention relates to a method for detecting harmonic characteristics of an electronic current transformer and a detection device thereof, belonging to the technical field of electric power measurement, in particular to a method capable of accurately detecting the harmonic characteristics of an electronic current transformer and finally realizing the harmonic current 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 in the harmonic respo...

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Problems solved by technology

[0007] 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 current transformer lacks effective detection methods and detection devices, the present invention provides a harmonic characteristic detection of electronic current transformer method, its harmonic source part can generate the primary current that can simulate the rated current of the real power grid harmonic current and the superposition of each harmonic current, and its detection device can measure the frequency of each harmonic current of the electronic current transformer characteristics, to achieve accurate measurement of harmonic currents in power systems

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