Patent ID: 6097280
Filing Date: 2000-08-01
Classification: G01R

Abstract:
A fault locator provided adjacent to a first terminal for performing fault location on a parallel transmission line comprising a first line and a second line having a terminal at both sides, based on status of the parallel transmission line through a current differential relay provided with the terminals at both sides of said first line and said second line, comprising:a data receiving unit for receiving a transmission signal and a reception signal from said current differential relay provided with said first terminal of said terminals at both sides, measuring a receiving timing of said transmission signal from said current differential relay provided with said first terminal, wherein said transmission signal and said reception signal each includes said status of the parallel transmission line;a fault detecting unit for detecting a fault on said first line and said second line based on electrical data that includes said status of the parallel transmission line and said receiving timing from said data receiving unit, said fault detecting unit outputting a start signal when said fault is detected;a data memory unit for storing and updating said electrical data of said first line and said second line from said data receiving unit, storing said electrical data related to said fault when said start signal is outputted from said fault detecting unit, wherein said electrical data is related to said first terminal and an other side terminal that corresponds to a second terminal of said first line and said second line;a synchronous correction unit for performing a synchronous correction processing to said electrical data stored when said start signal is outputted, based on information on said receiving timing of said transmission signal from said data receiving unit;a setting unit for setting an impedance value of three-phases and a line-length of said first line and said second line as a setting value;a fault location unit for performing a fault location by using said electrical data after said synchronous correction processing by said synchronous correction unit, said impedance value of three-phases, and said line-length by said setting unit, wherein a measurement value obtained as a result corresponds to a distance to a fault point; andan output unit for outputting the measurement value.