Rogowski coils offer highly accurate secondary outputs without the risk of saturation since they do not incorporate an iron core. The air - core design ensures linear measurement, although it generates only a relatively small voltage (1V as opposed to 100V). This characteristic enables a compact equipment layout and allows for easy integration into Gas - Insulated Switchgear (GIS) with minimal space requirements due to the absence of an iron core. Additionally, Rogowski coils exhibit high immunity to noise and surge voltages because their coupling factor is significantly lower than that of coils with an iron core.
In a GIS enclosure, the primary conductor functions as the primary winding of the Rogowski coil. The secondary winding of the coil, which has an air core, is connected to an analog - to - digital converter within an Intelligent Electronic Device (IED). Subsequently, it is linked to the protection and control system via an optical bus. The primary conductor, operating at a high - voltage potential, carries the current and serves as the primary winding of the Rogowski coil.
The secondary windings are at ground potential within the GIS enclosure. Their role is to transform the current in the primary conductor into an induced voltage in the secondary windings of the Rogowski coil. As shown in the photo, an electronic card then converts the measured value into a digital signal for connection to the control system.
