A power converter , including: a power conversion circuit having a first terminal set and a second terminal set , being configured to convert power input via one of the first terminal set and the second terminal set and output the converted power via the other of the first terminal set and the second terminal set; a measurement unit , being configured to measure voltage/current at a point on a first network linking a first power source and the first terminal set of the power conversion circuit, wherein the point is arranged between a circuit breaker (S1-S4) inserted in the first network and the first terminal set of the power conversion circuit; a controller , being configured to control the power conversion circuit to: generate a voltage/current waveform travelling along the first network with a power supplied by a second power source linked to the second terminal set of the power conversion circuit in response to a condition that a change rate of the measurement of the voltage/current exceeds a threshold; identify the voltage/current waveform from the measurements of the measurement unit; and locate a fault on the first network in consideration of an interval between a first timing when the controller identifies the voltage/current waveform and a second timing when the controller identifies an echo of the voltage/current waveform. a power conversion circuit having a first terminal set and a second terminal set , being configured to convert power input via one of the first terminal set and the second terminal set and output the converted power via the other of the first terminal set and the second terminal set; a measurement unit , being configured to measure voltage/current at a point on a first network linking a first power source and the first terminal set of the power conversion circuit, wherein the point is arranged between a circuit breaker (S1-S4) inserted in the first network and the first terminal set of the power conversion circuit; a controller , being configured to control the power conversion circuit to: generate a voltage/current waveform travelling along the first network with a power supplied by a second power source linked to the second terminal set of the power conversion circuit in response to a condition that a change rate of the measurement of the voltage/current exceeds a threshold; identify the voltage/current waveform from the measurements of the measurement unit; and locate a fault on the first network in consideration of an interval between a first timing when the controller identifies the voltage/current waveform and a second timing when the controller identifies an echo of the voltage/current waveform. generate a voltage/current waveform travelling along the first network with a power supplied by a second power source linked to the second terminal set of the power conversion circuit in response to a condition that a change rate of the measurement of the voltage/current exceeds a threshold; identify the voltage/current waveform from the measurements of the measurement unit; and locate a fault on the first network in consideration of an interval between a first timing when the controller identifies the voltage/current waveform and a second timing when the controller identifies an echo of the voltage/current waveform. <EOS>