Method for determining the fault location of a fault on a line of an electrical energy supply network, in which - first current and voltage values are measured at a first line end of the line; - second current and voltage values are measured at a second line end of the line; and - the fault location of a fault is defined using the first and second current and voltage values following the occurrence of said fault on the line; characterized in that - the current and voltage values measured at the line ends (11a, 11b) are subjected to a filtering, wherein first and second filtered current and voltage values are formed which indicate a selected frequency range of the measured current and voltage values; - a temporal characteristic of first fictitious fault voltage values present at a fictitious fault location on the line is defined using the first filtered current and voltage values and a propagation model for travelling waves on the line; - a temporal characteristic of second fictitious fault voltage values present at the fictitious fault location on the line is defined using the second filtered current and voltage values and the propagation model for travelling waves on the line; - a fictitious fault location on the line is determined for which the characteristic of the first fictitious fault voltage values corresponds most closely to the characteristic of the second fictitious fault voltage values, wherein the fictitious fault location on the line for which the characteristic of the first fictitious fault voltage values corresponds most closely to the characteristic of the second fictitious fault voltage values is determined by means of an optimization method, wherein the fictitious fault location is used as an optimization parameter of a target function of the optimization method; and - the determined fictitious fault location is used as the fault location of the fault on the line. - first current and voltage values are measured at a first line end of the line; - second current and voltage values are measured at a second line end of the line; and - the fault location of a fault is defined using the first and second current and voltage values following the occurrence of said fault on the line; characterized in that - the current and voltage values measured at the line ends (11a, 11b) are subjected to a filtering, wherein first and second filtered current and voltage values are formed which indicate a selected frequency range of the measured current and voltage values; - a temporal characteristic of first fictitious fault voltage values present at a fictitious fault location on the line is defined using the first filtered current and voltage values and a propagation model for travelling waves on the line; - a temporal characteristic of second fictitious fault voltage values present at the fictitious fault location on the line is defined using the second filtered current and voltage values and the propagation model for travelling waves on the line; - a fictitious fault location on the line is determined for which the characteristic of the first fictitious fault voltage values corresponds most closely to the characteristic of the second fictitious fault voltage values, wherein the fictitious fault location on the line for which the characteristic of the first fictitious fault voltage values corresponds most closely to the characteristic of the second fictitious fault voltage values is determined by means of an optimization method, wherein the fictitious fault location is used as an optimization parameter of a target function of the optimization method; and - the determined fictitious fault location is used as the fault location of the fault on the line.