An Analytical Fault Diagnosis Method Based on Component Relation Matrix and Event Relationship Description Matrix

There is a large amount of status, switch, and protection information in the transmission and distribution grid. Due to the complex relationship of these information and the high overlap of recognition logic, it is difficult to find the exact homeomorphic mapping between fault and information. This paper proposes an analytical fault diagnosis method by use of matrixed relationship description and operation to build the certain mapping between fault and information. First, there defines a component relationship matrix to describe the connection relations of various components in actual grid, and then form an action sequence chain of protective relays (PRs) and circuit breakers (CBs) based on the above relationship matrix. Second, define an event description relationship matrix, which use events to describe the connecting arcs in the relationship matrix. With the help of the status, switch, protection information received by supervisory control and data acquisition (SCADA) and other monitoring systems, the element in event relationship description matrix will become a known event vector. Through the above process, the paper further derives an analytical matrix calculation method to pick out the fault transfer and identification vectors, so as to accurately locate component faults and protection device malfunctions. Finally, there utilizes the above method to diagnose several actual faults of a local transmission and distribution system of China Southwest Power Grid, and verifies the feasibility and effectiveness of proposed method through the result analysis.