The invention discloses a
system and a method of positioning offshore wind farm collecting power line fault. Current transformers are arranged on the offshore wind farm collecting power line according to wind
turbine pre-fabricated substation access points; multiple terminal units are used for acquiring current data of pre-fabricated substation
high voltage-side CTs and CTs on the collecting power line; a fault positioning intelligent unit at a booster
station end carries out
processing and judging; and a fault positioning result is obtained finally. During a
data processing process, a network transmission model is used for determining the
time difference between different current terminal units; synchronous
processing and correction are carried out on the data through interpolation calculation; when a
differential protection principle is then used for fault judgment, a tri-linear
differential protection criterion is provided, unbalanced current and CT saturation situations in the
normal case can be avoided, the relation between the differential current and the braking current is judged, and a fault area is determined. The offshore wind farm collecting power line fault can be quickly positioned, and while
tripping is protected, the fault area is judged.