| 摘要 |
The present invention is concerned with a method for fault location in series compensated power transmission lines with two-end unsynchronized measurement, finding an application in the electrical power sector and for overhead uncompensated and series-compensated transmission lines. The method according to the invention wherein a distance to fault and fault resistance are determined by means of voltages and current values, measurement in the stations (A) and (B), before and after occurrence of the fault (101), comprising the following steps: based on the assumption that fault occurs in the line section LA between station A and series capacitor and metal oxide varistor device SC&MOV and based on the assumption that faults occurs in the line section LB between station B and series capacitor and metal oxide varistor device SC&MOV, the synchronization angle δA in term ejδA is determined (103a) in the first case fault at the section LA), the synchronization angle δB in term ejδB is determined (103b) in the second case (fault at the section LB); then taking into account the distributed parameter line model the distance to fault (dA) or (dB) is determined (104a, 104b) from the formula: dA=PSCdLA, dB=(1−Psc)dLB where: dLA, dLB—denotes an hypothetical distance to fault, expressed in relation to length (Pscl) which value is received by known iterative method; then an equivalent impedance of compensating bank at fault stage (formula (I) and (II)) is calculated (105a, 105b) with using the post fault of measured voltage and currents and an equivalent impedance of compensation bank at pre-fault (ZSC1—pre) is calculated (106a, 106b) in order to determine which distance (dA) or (dB) is the final result. |
