1. A method for identifying full parameters of a line by a fault recording data, wherein, comprising the following steps:S1: inputting, by an inputting device, fault recording data related to the line;

S2: conducting data processing, by a processor, on the fault recording data, comprising:

S21, transforming scale,

S22, aligning time scale of the recording data,

S23a, determining an upper limit fcs for the sampling frequency, controlling a low-pass filter whose the cut-off frequency fc is less than fcs performing a digital low-pass filtering for filtering the high-frequency signals to avoid frequency mixing when conducting re-sampling;

S23b, conducting re-sampling on the recording data with a frequency which is less than or equal to fcs, and

S23, intercepting data during the fault time;

S3: identifying, by the processor, full parameters of the line by the intercepted data and an differential equation of the full parameters of the line, comprising:

according to the state equations which changed from the differential equation of full parameters of the line,

Where X is a state variable vector, t is time, u is a control vector, y is a output vector, A is a state matrix, and B, C and D are matrixes or vectors,

identifying the estimated values Â, B, ?, D for the matrixes A, B, C, D; and

determining a resistance matrix R, a inductance matrix L and a capacitance matrix C according to the relationship of A, B, C, D for deducing the differential equation of full parameters of the line and the line parameters RLC;

Wherein, for the differential equation of full parameters of a fault line:

Where Rabcf is determined by the fault type, and if a is connected to the ground, rbf=?, rcf=?, raf=rf; if b is connected to the ground, raf=?, rcf=?, rbf=rf; if c is connected to the ground, raf=?, rbf=?, rcf=rf; if a and b are both connected to the ground, raf=rf1, rbf=rf2, rcf=?; if b and c are both connected to the ground, raf=?, rbf=rf1, rcf=rf2; if a and c are both connected to the ground, raf=rf1, rbf=?, rcf=rf2; and

identifying together the parameters of ?, rf or rf1 and rf2 and the parameters of Rabc1, Labc1, Cabc1, Gabc1, wherein the line parameters Rabc=Rabc1+Rabc2, Labc=Labc1+Labc2, Cabc=(Cabc1+Cabc2)/2 and Gabc=(Gabc1+Cabc2)/2;

and

S4: outputting, by an outputting device, an identified result.