OPTOELECTRONIC CURRENT TRANSFORMER FOR MEDIUM VOLTAGE NETWORKS
Journal Title: ANALELE UNIVERSITATII DIN CRAIOVA - Seria Inginerie electrica - Year 2010, Vol 34, Issue 34
Abstract
The paper presents an optoelectronic hybrid current transformer which allows current measurement in medium voltage networks and provides remote measuring signal transmission with high immunity against disturbances. An electromagnetic instrument transformer is connected to measuring chain including an optical data link between two electronic units: one unit which operates at medium voltage in measuring point and other which operates at low voltage in monitoring and control point. The first unit achieves both the voltage-to-frequency and electro-optic conversions of measuring signal from secondary coil of current transformer. The second unit achieves the optic-to-electric and frequency-to-voltage conversions to obtain the analogous measuring signal in condition of reference document, the standard IEC 60044-8. The first unit generates the variable reference signal (measuring signal) for the second unit which operates as closed loop system based on PLL structure with very good static and dynamic performances. The structure of optoelectronic hybrid current transformer, the function of each structural block, the testing procedures, experimental results and conclusions are presented in the body of paper. Also, a few steps for mathematical model used in dynamic behavior analysis and the main parameters of step response are presented. Mr. Prof. Dr. Eng. Andrei Marinescu, is project manager, coordinating specialist in electromagnetic compatibility and high power/high voltage measurement. Mr. Eng. Nicolae Paduraru is the designer of electromagnetic transformers with insulator support and metal case. Mr. Eng. Alexandru Manta and Mr. Eng. Marinel Popescu are the designers of electronic modules and optical data link.
Authors and Affiliations
Marinel POPESCU, Alexandru MANTA, Nicolae PĂDURARU, Andrei MARINESCU
Keywords
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