Development of Real Time Protective Coordination Algorithm for HTS Power Cable

The electrical characteristics of the HTS power cable are dominantly dependent on the property of the HTS wire and cable geometry such as wire twist pitch, cable diameter, gap between the layers, etc. The quench occurs in HTS power cable caused by fault, the resistance appears, the current redistributed, the line impedance between the source and fault spot must be transiently changed, and mutual inductance value is directly affected. It is very important to make sure that the protective coordination system is in real utility network. This paper presents a real time protective coordination algorithm for triad coaxial HTS power cable using symmetrical coordinate method and vector analysis under utility fault condition. The protective coordination algorithm is developed and evaluated by using the real time data acquisition system with real time digital simulator (RTDS).