Success for earth leakage detector

摘要

Rockwell Automation has collaborated with Australian electrical engineering and manufacturing company Ampcontrol to successfully test the VSDguard earth leakage relay that detects the impact of earth leakage on mine sites. Testing of the relay on a PowerFlex 7000 demo system took place at Rockwell's Canadian site. The aim of the testing was to determine if earth leakage currents were within acceptable levels under normal operating conditions, and if earth leakage currents were detectable under earth fault conditions. In addition, the testing assessed whether VSDguard is capable of detecting earth leakage currents at all frequencies produced by the variable speed drives (VSDs) and trip under all earth fault conditions. The trial successfully proved the relay does work and can detect earth leakage at different frequencies.