New approach for online fault resistance estimation

In order to estimate fault resistance accurately in real-time, a new approach is proposed based on the emerging synchronized measurement technology, using synchronized data sampled at both line terminals. This new approach uses n type equivalent model and time-domain signals during the fault to estimate fault resistance online by solving differential equations of the circuit. The approach does not require the information of fault location and would be more robust, accurate, flexible, and cost-effective than those approaches that do require the information of fault location. Simulations on a 500kV two-end system are run by PSCAD/EMTDC to verify the effectiveness and accuracy of the proposed approach.