Method for current measurement in primary conductor for e.g. long overhead lines for distributing electrical energy, involves adjusting compensation current based on regulating signal, and determining current based on adjusted current

摘要

The method involves measuring a magnet probe current by a winding (105) for a magnet probe current. The measured magnet probe current is compared with a threshold current. An output voltage is applied at the winding for measuring the magnet probe current based on the comparison. The measured magnet probe current is compared with a preset value. A regulating signal is determined based on the comparison. A compensation current to compensation windings (103) is adjusted based on the regulating signal. A current in a primary conductor (102) is determined based on the adjusted compensation current. An independent claim is also included for a device for current measurement in a conductor.