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Sensitivity of start element impacts the performance of transmission line protection. Normally, start element is affected by data window length. A start element of transmission line relay protection based on current variation sample data of three phases at the same time is proposed in this paper. It includes two criterions. The start element performance is not impacted by data window and frequency...
Current differential protection widely used in transmission line based on comparing sum and difference of two side current phasors. Its sensitivity was impact by load current. A current differential protection based on virtual restraint current was proposed. The virtual current contains phase information of the bigger current and amplitude information of the smaller current. The sensitivity of criterion...
When a fault occurs on a transmission line, fault generated high frequency transient components are a series of natural frequencies in frequency domain. This paper proposes a protection algorithm for EHV (Extra High Voltage) transmission line based on spectrum characteristic of natural frequency. Spectrum correlation coefficient is used to determine whether a fault is internal or external fault. It...
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