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公开(公告)号：EP1820034A2
公开(公告)日：2007-08-22
申请号：EP05803993.4
申请日：2005-11-18
申请人： Nesa A/S
CPC分类号： H04W4/14 , G01R1/00 , G01R15/246 , G01R19/2513 , G01R31/025 , G01R33/0322 , H04L67/12
摘要： The present invention relates to a monitoring system for detecting earth faults in an electrical power supply grid. The system may comprise a plurality of monitoring devices mounted in a number of monitoring locations, each of the monitoring devices may include a detector for detecting level of harmonics in the electrical power. The level of harmonics is preferably detected in a specific frequency range. The monitoring devices may further include a memory device for storing a harmonics reference value and may still further include a processor for comparing the level of harmonics with the reference level. The monitoring device may even still further include a communication device for transmitting an alarm provided the level of harmonics is above the reference level for a specific period of time.
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