AC/DC insulation monitor IW1000

In well-insulated IT-systems (new installations) with a lot of connected devices a high leakage capacity may occur due grounded input filters, cable capacities etc. Common insulation guards, working with pulse measuring mode, are running with fixed pulse widths. For well operation, they must be adapted manually to the actual leakage capacity of the system. There are also insulation guards available, working with self adapting pulse width. However these devices need a long measuring time because the result will be at least available, when loading voltage will find its maximum (no more change in load voltage). With the time optimized measuring method of the IW1000, insulation resistance and leakage capacity will be calculated after 2-time constants. Therefor the reaction time of the IW1000 is very short. By applications of modern signal processing-algorithms in the software and over sampling-mode in connection with high signal-dissolution of the ADconverter, the IW1000 runs with high stability and reliable measurement. DC-components of the leakage currents could be appear without insulation error in case of an asymmetric load during positive and negatives half-waves. For example: Power controlled devices which are operating in phase-angle control or as zero-crossing switch (SSR- relays). Even frequency converters produce high DCleakage currents. With time optimized pulse measuring method of the IW1000, DC-voltage-shares at the leakage capacities measured during positive and negative voltage pulses will be eliminated automatically by calculation. Therefor the measuring method is qualified for AC-AC/DC and true DC-systems. ●Time optimized pulse measuring method