A large current transient characteristic detection device of an electronic current transformer

Abstract

The invention provides a large-current transient characteristic detection device of an electronic current transformer, which includes a controller unit, a transformer, a DC charging power supply and a waveform output unit connected to an ECT test product; the waveform output unit includes a steady-state waveform output unit and a transient waveform output unit; the controller unit includes a charging control module, a phase selection and closing control module, a waveform monitoring module and a waveform adjustment module; the controller unit outputs a signal for adjusting the working state to the electronic device in the waveform output unit to control the waveform output unit Output steady-state waveforms and transient waveforms to ECT samples. Compared with the prior art, the present invention provides a large current transient characteristic detection device of an electronic current transformer, which can accurately adjust the current peak value and decay time constant of the output transient voltage waveform and transient current waveform To meet the detection requirements of different types of electronic current transformer samples.

Description

technical field [0001] The invention relates to a detection device for an electronic current transformer, in particular to a large current transient characteristic detection device for an electronic current transformer. Background technique [0002] The transient test of electronic current transformer includes direct method and equal ampere-turn method. The direct method is tested by a large-capacity current source with phase-selection closing function, and the test process needs to meet the time constant requirements of the primary circuit. Yet still do not possess at present the long-time current transformer high-current transient test facility; As when the rated current is 2kA, the symmetrical short-circuit current can not carry out the transient test to it when the symmetrical short-circuit current is 40kA, a large number of long-term observations, research findings by the inventor At present, there is no existing technology that can meet the requirements of the transie...

AI Technical Summary

Problems solved by technology

When the equal ampere-turn method is used for the equivalent error test, although the multi-turn primary wire is evenly distributed on the winding circumference, the magnetic field generated by it is uniform in segments as a whole, but the magnetic field near the coil plane of each turn is the strongest, causing its corresponding The local magnetic density of the iron core increases, and even local magnetic saturation occurs, the iron loss increases, and the primary excitation current increases, which eventually causes the error of the current transformer to deviate accordingly.

Images