The IPC technology-a new approach for substation updating with passive short-circuit limitation

The paper presents a new approach to fault current limitation based on the Inteiphase Power Controller (IPC) technology. From a power system point of view, this IPC has the same function as a transformer: it handles its share of the load current but, during a fault, it does not contribute to the fault current. It thus allows a substation to be uprated w:.thout increasing the fault level. A fourtransformer 315-120 kV substation is used to illustrate the concept.