Current transformer with self-calibration function and self-calibration method thereof

Abstract

The invention relates to a current transformer with a self-calibration function and a self-calibration method thereof. The current transformer comprises an iron core, a primary side winding coil, a secondary side winding coil, a switch and a resistor, wherein the secondary side winding coil consists of dual windings; the dual secondary windings are wound in parallel in an interpenetrating manner, with consistent number of turns and coil diameters; the switch is connected with the dual secondary windings in parallel; the resistor is connected with the switch in series, and the resistor is a non-inductive resistor for wire winding; and the resistance value of the resistor is equal to that of the shunt-wound dual secondary windings. The self-calibration method of the current transformer comprises the steps as follows: the switch of the current transformer is disconnected to ensure that the dual secondary windings are disconnected from each other; any one of the dual secondary windings is selected to be connected with a strong current generator while the other winding is connected with a current transformer calibrator; the two secondary windings have the same number of turns, so that a self-calibration mode with a current ratio of 1 to 1 is formed; and the error level of the current transformer is determined according to the reading number of the calibrator.

Description

technical field [0001] The invention relates to the field of transformers, and more specifically, to a current transformer with a self-calibration function and a self-calibration method thereof. Background technique [0002] The in-service detection technology of the primary equipment in the power system is the development trend of the power system. According to the JJG 1021 regulations, the weekly inspection time of the electromagnetic current transformer is 10 years, but the error weekly inspection of the current transformer still stays at the power failure detection level. When carrying out the error detection of the current transformer, it is necessary to pass the rated current through it once, and then compare it with the standard current transformer connected to it, so as to obtain the error data. Using this method not only requires a high-power current booster, but also requires a standard current transformer and wires that can withstand high currents, and the workloa...

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Problems solved by technology

The higher the voltage level, the greater the diameter of the GIS pipeline and the length of the circuit, the more difficult it is to use this method to test the error, which leads to a greater burden on the test unit in terms of equipment investment and manpower input

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