MEDICIÓN DE PARÁMETROS ELÉCTRICOS DE LÍNEAS DE ALTA TENSIÓN EN PRESENCIA DE INTERFERENCIA PROVOCADA POR UN ENTORNO ELECTROMAGNÉTICO REAL

ING. JUAN SERRANO; ING. LEOPOLDO RODRIGUEZ; ING. BARON, GUSTAVO; DR. ING. HUMBERTO ZINI

Mar del Plata

Congreso; XII Latin-American Congress on Electricity Generation and Transmission; 2017

CLAGTEE

The accuracy of the line parameters are importance for the setting of line protection relays and for accurate systems studies.Assessment line parameters by measurements is usual part of the commissioning tests. These parameters are calculated from electrical magnitudes which are measured in tests. In both, measurement and calculation stages the procedure raises some difficulties.An important issue is the electromagnetic coupling with other lines that operate the power frequency. These interferences affect the measurement when the tests is in the same frequency.There are on the market test equipment that avoid this error by estimating the impedances from measurements made at different, but near, frequencies. They are based on power electronics and digital processing to filter the interference.The IEE-UNSJ-CONICET institute has undertaken a development based on this approach. The main concepts, as well as the first results, are shown in the paper.The paper also addresses the procedure for calculating line parameters from the measurement. There is currently no well-established procedure for this task. The methodology usually applied is based on the simplification that result in errors, especially for long lines. An iterative procedure has been developed to avoid this source of error.