access icon free High speed directional relaying algorithm based on the fundamental frequency positive sequence superimposed components

The conventional travelling wave protection is susceptible to the high frequency transient quantities, which can reduce the protection reliability. A directional-relay algorithm based on positive sequence superimposed components is proposed in this study. In microprocessor relays, the extraction of fundamental frequency voltages and currents is, conventionally, provided by phasor estimation methods such as the Fourier algorithm. The common required time for fault detection in these relays is approximately one to two cycles. This study presents a high-speed algorithm for the extraction of fundamental frequency positive sequence voltages and currents superimposed components based on Park transformation. In the meantime, specially designed high speed algorithms to solve the difficult problems that exist in a real system are proposed. Extensive simulations are performed to evaluate the performance of the proposed algorithm. The results show that the algorithm is fast and reliable for power transmission line protections. Also it is immune to fault resistances and system condition.

Inspec keywords: performance evaluation; relay protection; microprocessor chips; power transmission lines; power transmission faults; power transmission reliability; power transmission protection; fault diagnosis; Fourier transforms; phase estimation

Other keywords: high speed directional relaying algorithm; phasor estimation method; performance evaluation; fault resistance; travelling wave protection; fundamental frequency voltage extraction; fundamental frequency positive sequence superimposed components; microprocessor relay; currents superimposed component; power transmission line protection; high frequency transient quantity; Fourier algorithm; power transmission reliability; protection reliability; Park transformation; fault detection

Subjects: Power transmission, distribution and supply; Other topics in statistics; Microprocessors and microcomputers; Protection apparatus; Reliability; Integral transforms

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