Hidden Trouble Analysis of Sampling Anomaly of Intelligent Substation Merging Unit

This paper analysis of the hidden danger of relaying shutting caused by the merging unit sampling anomaly in intelligent substation. By analysis the alarm information combined with the operation in the field, this paper sort out relaying shutting condition. In view of the hidden dangers caused by this anomaly, the corresponding preventive measures have been put forward. Technical experience has been accumulated for dealing with abnormal alarm information operation of intelligent substation merging unit.