Precise fault location apparatus and method for collector line in onshore wind farm

A precise fault location apparatus for a collector line in an onshore wind farm, comprising:

• a slave unit installed at the beginning of a collector line cable and being configured to:
• input a high-voltage pulse signal S3 into a collector line;
• record an output time of the high-voltage pulse signal S3 and a time at which the high-voltage pulse signal S3 reaches the slave unit after being reflected from a fault point;
• calculate a time difference, and then multiply a wave speed by the calculated time difference to obtain a cable length at a fault point;
• and the slave unit being further configured to:
• input a high-voltage pulse signal S1 into the collector line;
• receive a high-voltage pulse signal S2 inputted by a master unit;
• and detect an input time of the high-voltage pulse signal S1 as well as a reception time of the high-voltage pulse signal S2;
• and
• the master unit being installed at a measurement point near the fault point of the collector line cable and configured to:
• receive the high-voltage pulse signal S1 inputted by the slave unit;
• output the high-voltage pulse signal S2 to the slave unit;
• and detect a reception time of the high-voltage pulse signal S1 as well as an output time of the high-voltage pulse signal S2.