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Online checking method for high-tension current transformer

A technology of high-voltage current and calibration method, which is applied in the direction of instruments, measuring electrical variables, measuring devices, etc., can solve the problems that have not been mentioned in the online calibration of current transformer content, and achieve good real-time performance, high accuracy, and improved reliability sexual effect

Inactive Publication Date: 2012-04-04
STATE GRID ELECTRIC POWER RES INST
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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

Method used

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  • Online checking method for high-tension current transformer
  • Online checking method for high-tension current transformer
  • Online checking method for high-tension current transformer

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Embodiment Construction

[0018] Embodiments of the invention will be further described below in conjunction with the accompanying drawings:

[0019] Such as figure 1 As shown, the present invention consists of a standard channel, a checked channel and a verification platform. The standard channel mainly includes the standard current sensor 1, the high-voltage side data sending module 2, the calibrated channel includes the calibrated transformer output conversion module 3 and the local data receiving module 4, the calibration platform 5 is composed of industrial computer and virtual instrument software, 6 Optical fiber for data transmission.

[0020] Such as figure 2 As shown, the present invention is a device for verifying various parameters of the calibrated high-voltage current transformer operated on site by comparing the output values ​​at the same time between the standard current sensor with known accuracy and the calibrated high-voltage current transformer. Its working principle is as follo...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R35/02
Inventor 童悦叶国雄郭克勤黄华刘彬刘翔万罡胡蓓陈鹏冯翔翔杨帆
Owner STATE GRID ELECTRIC POWER RES INST
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