Online accuracy detection method and system of current transformer

Abstract

The invention discloses online accuracy detection method and system of a current transformer. A standard current sensor is connected with a transmission line and collects a current signal on the transmission line; a current signal output by the current transformer and the current signal on the transmission line are collected by respective signal collectors and sent to a signal processor in sharingtime; and the signal processor synchronously sends the signals to a central processing system (CPU) which compares and processes the two signals received in the same clock and calculates the error conditions of the measured current transformer. The online accuracy detection system of the current transformer can be electrically connected or disconnected with a circuit of a transformer to be measured and can uninterruptedly carry out accuracy comparison measurement with the transformer to be measured under an electric operation condition for dozens of hours so as to estimate the current transformer under different operational working conditions and environmental characteristics, achieve the online accuracy estimation of the current transformer and have favorable effect.

Description

technical field [0001] The invention relates to the technical field of precision measurement of high-voltage transformers, in particular to an online detection method and system for high-voltage current transformers. Background technique [0002] At present, with the development of my country's power grid industry, especially the separation of power generation and transmission implemented by the reform of the power industry system, the accuracy, fairness and impartiality of electric energy measurement have attracted more and more attention from all parties. The accuracy and reliability of the current transformer is an important guarantee for the measurement, protection and monitoring of the power system. In order to ensure the fairness and justice of electric energy measurement and effectively protect the legitimate rights and interests of the power department, power generation department and users, it is very necessary to verify the error of the current transformer. At pre...

AI Technical Summary

Problems solved by technology

There are two problems in such a verification method: 1) Even if there is an out-of-tolerance current transformer, it must be checked out after the verification expires, and the impact caused by the out-of-tolerance within the verification period cannot be known in time; 2) The traditional verification method It is carried out in a specific field environment and cannot truly reflect the accuracy characteristics of the current transformer under different environmental conditions during operation

It is not advisable to improve the rationality of measurement supervision by blindly shortening the verification cycle, because with the development of various industrial technologies, the losses caused by short-term power outages are also very huge

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