Phase Selection Component for Power Line Protection in Smart Grid

Current distribution line protection in smart grid can’t be solved well in low sensitivity and unsatisfied rapidity by protection principle nowadays. The wavelet analysis has a strong feature-extracting function, which can extract the fault signatures of the fault phase. In this paper, the EMTP is used to make simulations and wavelet transformations of power line-end short-circuit failure, fault-phase supply voltage crossing zero, single-phase grounding fault of transmission line through high impedance, transitional fault, etc., showing the parameter selection of wavelet transformation used in optimization design of phase selection component for line protection.