Online checking method for high-tension current transformer

Abstract

The invention relates to an online checking method for a high-tension current transformer, which can check the high-tension current transformer in the field operation with high accuracy. The online checking method is characterized in that in a return circuit of the high-tension current transformer to be checked, a high-accuracy pincerlike hollow coil based on a PCB (Printed Circuit board) is connected in series, so that the high-tension current transformer is used as a standard current transformer, the signal of the high-tension side is digitized and transmitted to the low-tension side through fiber transmission, the output value of the standard current transformer and the output value of the checked high-tension current transformer at the synchronized instant are compared through an external synchronous trigger signal, the digital integration algorithm and error theory algorithm are realized by using a virtual instrument in a checking platform, so that the accuracy of the checked high-tension current transformer in the field operation is checked, the cost of interruption is reduced, and the checking period of the high-tension current transformer is shortened.

Description

technical field [0001] The invention relates to an on-line calibration method for a high-voltage current transformer, specifically, using a high-accuracy clamp-shaped hollow coil as a standard current sensor, and performing calibration on a high-voltage current transformer operating on site without power failure, which belongs to electrician measurement and testing technology. Background technique [0002] The accuracy of the current transformer is an important guarantee for the measurement, protection and monitoring of the power system. In order to ensure the accuracy of electric energy measurement and reasonably protect the legitimate rights and interests of the power department, power generation department and users, it is very necessary to monitor the error of the current transformer. The current transformer is the basic equipment for measuring the current and voltage physical quantities of the power system. It is the first step and the most important step in the online...

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Problems solved by technology

[0004] Chinese utility model patent "An electronic high-voltage current transformer" (application number: 200720126458.7 application date: 2007-11-21) and invention patent "a high-precision open-type Rogowski coil" (application number: 200910065785.X application date : 2009-08-14), only related to online electronic transformers and high-precision PCB board-type transformers (the precision can reach 0.05 level), and did not mention the content of online calibration current transformers

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