Abstract
In this paper, the analysis and improvement of protective relay systems are performed with respect to HTS (High Temperature Superconducting) power cable applied in a model power system. The over current relay and differential relay with proposed new decision making algorithm are implemented under a couple of fault conditions, a single line-to-ground fault and three phase short circuit. According to the analysis results, there is not a particular aspect for the protection system of HTS power cable, but the impedance variation of HTS power cable should be taken into account under the fault conditions. In the case of the differential relay system, the induced current ratio based fault detection scheme is proposed and applied for the bus to bus connection of HTS power cable protection. The circuit breaker operates according to the proposed algorithm well. The results obtained through the analysis of the simulation would provide more useful data for the protection system design of HTS power cables and their installation in power systems.
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