Current transformer system with inner core - has second core winding connected in parallel with winding of main core to reduce overcurrent factor

摘要

Current transformer design with an inner core is proposed and is arranged so that short comings of conventional designs, such as high over-current factor can be avoided without resorting to the use of external parallel-connected chokes or an intermediate transformer in order to reduce the excessive over-current factor. Moreover the location of a parallel choke within the transformer housing is very 'space consuming' and thus impracticable for many applications. To overcome the problems, a second core is located inside the winding space of the transformer core, and is provided with a winding arrangement, such that both core windings are connected in parallel with one another.