Method for Determination of a Setting Value Which Indicates a Ground Impedance, and Measurement Device

A method for determining a setting value for an electrical protective device, the method which comprises, on occurrence of a ground short:

• recording first current phasor measured values and first voltage phasor measured values using a first measurement device at a first end of a section of an electrical power supply line;
• recording second current phasor measured values and second voltage phasor measured values using a second measurement device at a second end of the section of the electrical power supply line;
• determining from the first current phasor measured values, the first voltage phasor measured values, the second current phasor measured values, and the second voltage phasor measured values a fault location value indicating a fault location at which the ground short has occurred on the section of the electrical power supply line;
• and
• calculating, from the fault location value, a setting value indicating a ground impedance.

A measurement device, comprising:

• a recording device configured to record first current phasor measured values and first voltage phasor measured values present at a first end of a section of a power transmission line;
• a communication device, configured to receive second current phasor measured values and second voltage phasor measured values recorded by way of a further measurement device at a second end of the section;
• and
• a data processing device configured to:
• calculate a fault location value, indicating a location of a ground short on the section, from the recorded first current and voltage phasor measured values and the second current and voltage phasor measured values;
• and
• calculate a setting value, indicating a ground impedance, from the fault location value.