High-voltage current transformer leakage current and error measuring method and system

Abstract

The invention discloses a high-voltage current transformer leakage current and error measuring method and system. The method comprises the steps of: obtaining leakage currents of a high-voltage current transformer to be tested under a plurality of test high-voltage voltages; obtaining errors of the high-voltage current transformer to be tested under the plurality of test high-voltage voltages; performing model training according to the leakage currents, the errors and corresponding test high voltages of the high-voltage current transformer to be tested to obtain a leakage current error mappingmodel of the high-voltage current transformer to be tested under the high voltage; and obtaining corresponding errors according to the obtained leakage currents of the high-voltage current transformer to be tested and the leakage current error mapping model. The method and system only measure the leakage current to obtain the corresponding errors in the following error monitoring to obtain accurate errors through measurement with no need for improvement of a high-voltage current transformer without a capacitance shielding structure and with no need for direct error measurement under the highvoltage so as to ensure the cost saving while test safety.

Description

technical field [0001] The invention relates to the field of electric power technology, and more specifically, to a method and system for measuring leakage current and error of a high-voltage current transformer. Background technique [0002] The high-voltage current transformer of the power system needs to withstand the operating voltage of the power grid, and the method of measuring the error at low voltage is used in the laboratory and field verification of the current transformer. Because of the high risk factor of high-voltage measurement and troublesome operation, usually only the combination Type transformers will require error testing by applying high voltage at one time. In this way, for high-voltage current transformers, due to the capacitive leakage caused by distributed capacitance, the error of the verification under low voltage will be different from the error under actual working conditions; especially for high-voltage current transformers without a capacitive...

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Problems solved by technology

In this way, for high-voltage current transformers, due to the capacitive leakage caused by distributed capacitance, the error of the verification under low voltage will be different from the error under actual working conditions; especially for high-voltage current transformers without a capacitive screen structure, the primary high-voltage winding The resulting capacitive leakage has a great impact on the error and cannot be ignored. Some studies have shown that the impact of capacitive leakage on its error can reach 10 -3 ~10 -4 Generally, the current transformers in the 10kV ~ 35kV distribution network generally do not have a capacitive screen structure, so it is not realistic to update the hardware of such a large number of current transformers

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