Patent ID: 6633166
Filing Date: 2003-10-14
Classification: H02H

Abstract:
A method for producing a fault signal of a power transmission arrangement, comprising:providing a first conductor of a first three-phase power transmission line, and a second phase conductor of a second three-phase power transmission line disposed along the first power transmission line; sampling a current measurement variable MIa, and digitally converting the sampled current MIa to form current samples; sampling a voltage measurement variable MUa, and sampled and is digitally converting the sampled voltage MUa to form voltage samples; sampling a current measurement variable MIb, and digitally converting the sampled current MIb to form current samples; sampling a voltage measurement variable MUb, and digitally converting the sampled current MUb to form voltage samples; determining a complex loop impedance measured value for the conductor-conductor loop using the current and voltage samples or using auxiliary measurement variables derived from the current and voltage samples; and determining a fault signal if the loop impedance value is within a predetermined response range.