System and method used for detecting error of self-correcting current transformer

Abstract

The invention discloses a detection method and system which are used for detecting an error of a self-correcting current transformer. The system comprises a core integrity detection unit, a winding turn number detection unit, an error accuracy measurement unit and a security coefficient detection unit. The system does not need to use a large-capacity strong current generator or bear a long wire with thousands of amperes when performing error measurement on a current transformer coil, thereby reducing the working intensity in error measurement of the field current transformer. The system enables the current transformer coil to complete core performance checking under all operating conditions when 1A small current is inputted into the current transformer coil by adopting a mode of externallyconnecting a 1A:1A small standard instrument. According to a principle of equal ampere-turns, an external coil with the turns ratio being the same as that of a detected coil is adopted to be comparedwith the detected coil, and the number of turns of the coil is enabled to be accurately measured under low current.

Description

technical field [0001] The invention relates to the field of detection, and more specifically, to a system and method for detecting errors of self-calibrating current transformers. Background technique [0002] In the lines of power generation, power transformation, power transmission, power distribution and power consumption, the magnitude of the current varies greatly, and the current value ranges from a few amps to tens of thousands of amps. In order to facilitate measurement, protection and control, it needs to be converted into a unified current. In addition, the voltage on the line is generally relatively high, such as direct measurement is very dangerous, and the current transformer plays the role of current conversion and electrical isolation. The metering winding of the power current transformer needs to be periodically tested according to the provisions of the metering law. The periodic detection of the error characteristics of the current transformer is an importa...

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Problems solved by technology

[0004] There is no power current transformer with self-calibration function in the existing technology. At present, the product cannot meet the simple and fast judgment of the function of the power current transformer on site, check whether the coil is damaged during transportation, whether the winding error is correct, and the safety factor Whether it meets the basic functions such as standard

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