Patent ID: 7521916
Filing Date: 2009-04-21
Classification: G01R

Abstract:
1. Apparatus for the detection of a primary current in a protection current range with a current sensor, the protection current range having an upper protection current limit, and the apparatus comprising a current sensor which generates a voltage signal, the same current sensor is suitable for measuring current in a metering current range with an upper metering current limit, wherein the apparatus further comprises a passive, analog attenuation element and a voltage-limited electronic element, which has an upper electronic element protection voltage limit and an upper electronic element metering voltage limit, the electronic element metering voltage limit being smaller than the upper electronic element protection voltage limit and which electronic element is suitable to measure a secondary protection voltage signal with measuring precision within a protection voltage range having an upper protection voltage limit, the protection voltage signal being generated from a primary protection current, and which is suitable to measure a metering voltage signal within a metering voltage range with an upper metering voltage limit, the metering voltage signal being generated from a metering current, and the metering voltage limit being smaller than the protection voltage limit, the same electronic element being suitable to measure a protection and metering voltage signal and wherein