Current transformer error state discrimination method and device, terminal equipment and medium

Abstract

The invention discloses a current transformer error state discrimination method and device, terminal equipment and a medium, and the method comprises the steps: constructing a monitoring data set and a modeling data set based on all lines under the same node of a transformer substation according to the real-time secondary output data of a detected current transformer in each line and the historical data in a normal operation state; simulating a line fault state in the modeling data set to generate fault data; constructing an abnormal database of the detected current transformer by using the fault data and the modeling data set; determining a local abnormal factor threshold boundary of the abnormal database; and calculating a local abnormal factor of the monitoring data set, comparing the local abnormal factor with a threshold boundary of the local abnormal factor, and judging an error state of the detected current transformer. According to the invention, online evaluation of the metering error of the current transformer is realized, dependence on power failure and a physical standard device is eliminated, and the method is suitable for current transformers with different principles or accuracy levels, and has the advantages of high precision and strong applicability.

Description

technical field [0001] The invention relates to the technical field of power grid data analysis, in particular to a method, device, terminal equipment and medium for discriminating the error state of a current transformer. Background technique [0002] Current transformer, referred to as CT, is a general-purpose device that converts large currents into small currents for measurement, and is widely used in power systems. Metering performance is the most critical attribute of a current transformer. With long-term operation, the current transformer may be affected by various physical fields such as electricity, magnetism, heat, and force, which may cause error offsets or even abnormalities in the transformer, and then It leads to the failure of current measurement, which seriously affects the stable operation of the power system. Therefore, calibration work is usually performed before the current transformer is connected to the grid to ensure its measurement accuracy. [0003...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method, device, terminal equipment and medium for discriminating the error state of a current transformer, so as to solve the problems of low measurement accuracy, poor implementability and easy inspection of the power grid in the online identification method of the current transformer error state in the prior art. problem causing impact

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