Distance protection arrangement for monitoring an electrical power transmission line, - comprising a distance protection apparatus, which is connected to one end of the power transmission line and is suitable for measuring voltage and current at said one end to form first voltage and current measurement values (U1, I1) - wherein the distance protection apparatus is additionally suitable, with the first voltage and current measurement values with the use of a predefined line impedance value (Z Ltg) relating to the line impedance of the power transmission line according to magnitude and/or phase, for monitoring the electrical power transmission line for a fault and, if appropriate, for generating a fault signal indicating the fault on the power transmission line, and wherein - the distance protection arrangement comprises a further apparatus, which is connected to the other end of the power transmission line and is suitable for measuring voltage and current at the other end to form second voltage and current measurement values (U2, I2), characterized in that - the distance protection arrangement comprises a line impedance measuring device, which is suitable, with the use of the first and second voltage and current measurement values, for calculating the line impedance of the power transmission line and for providing a measured line impedance value (Z Ltg '), and - the distance protection arrangement is suitable for taking account of said measured line impedance value during the further monitoring of the power transmission line, wherein - the distance protection arrangement comprises a parameterizing module which is suitable for replacing the predefined line impedance value of the distance protection apparatus by the measured line impedance value and for parameterizing the measured line impedance value as new predefined line impedance value in the distance protection apparatus, wherein the parameterizing module is configured in such a way that - it replaces the predefined line impedance value of the distance protection apparatus by the measured line impedance value only if the deviation between the measured line impedance value and the predefined line impedance value exceeds a predefined threshold value according to magnitude and/or phase, and - the distance protection apparatus is suitable, after a parameterization by the parameterizing module for generating the fault signal with the use of the new predefined line impedance value. - comprising a distance protection apparatus, which is connected to one end of the power transmission line and is suitable for measuring voltage and current at said one end to form first voltage and current measurement values (U1, I1) - wherein the distance protection apparatus is additionally suitable, with the first voltage and current measurement values with the use of a predefined line impedance value (Z Ltg) relating to the line impedance of the power transmission line according to magnitude and/or phase, for monitoring the electrical power transmission line for a fault and, if appropriate, for generating a fault signal indicating the fault on the power transmission line, and wherein - the distance protection arrangement comprises a further apparatus, which is connected to the other end of the power transmission line and is suitable for measuring voltage and current at the other end to form second voltage and current measurement values (U2, I2), - the distance protection arrangement comprises a line impedance measuring device, which is suitable, with the use of the first and second voltage and current measurement values, for calculating the line impedance of the power transmission line and for providing a measured line impedance value (Z Ltg '), and - the distance protection arrangement is suitable for taking account of said measured line impedance value during the further monitoring of the power transmission line, wherein - the distance protection arrangement comprises a parameterizing module which is suitable for replacing the predefined line impedance value of the distance protection apparatus by the measured line impedance value and for parameterizing the measured line impedance value as new predefined line impedance value in the distance protection apparatus, wherein the parameterizing module is configured in such a way that - it replaces the predefined line impedance value of the distance protection apparatus by the measured line impedance value only if the deviation between the measured line impedance value and the predefined line impedance value exceeds a predefined threshold value according to magnitude and/or phase, and - the distance protection apparatus is suitable, after a parameterization by the parameterizing module for generating the fault signal with the use of the new predefined line impedance value.