Mode Voltage Inner-product-based Single-phase Adaptive Reclosure Strategy
For high-voltage transmission lines shunt-free reactors,a single-phase adaptive reclosure method based on in-ner-product of mode voltage is proposed.First Clark phase-mode transformation matrix is used to convert voltage phasor into modulus to remove the coupling relationship between phases.Then the amplitude of fault phase voltage modulus un-der transient fault is analyzed,and the inner-products of α-mode component and 0-mode component of fault phase voltage are obtained respectively,and the inner-product ratio of the two mode components is obtained.After a single-phase-to-ground fault occurs in a transmission line,the voltages of fault phase and sound phase are different under different fault types,and the inner-product ratio of mode components is also different under different faults.By observing the internal product ratio curve,the permanent fault and transient fault are differentiated and the quenching time of secondary arc is determined.The method is simple to realize and can quickly identify the fault nature and whether the secondary arc is ex-tinguished.The calculation consumption is low and the influence of line conditions is small.It is also suitable for symmet-ric and asymmetric transmission lines.EMTP simulation results have verified the accuracy and reliability of the proposed method.
万方数据
维普
