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Project: T183700 #3280

In this project, a set of approaches had been proposed with respect to the recording and utilization of reliability measures to assess transmission lines performance. The methodologies targeted 3 levels in transmission grids – namely, the system, line and component levels.

At each level, the available reliability performance indices were reviewed and their definitions expressed in mathematical format. The inputs to these indices were discussed and their application scenarios specified. Among them, the key reliability performance indices were shortlisted for characterization of two representative parameters at each level: the unavailability frequency and duration.

Reliability inputs were studied based on practical measurement availability in transmission systems. The definitions and format specified in the Transmission Availability Data System (TADS) were proposed for data collection purposes.

Since the study focus was on reliability issues attributed to transmission lines, data screening was applied to the collected reliability information. Two case studies were conducted to demonstrate the process of such statistical analysis based on practical outage data provided by two monitor utilities.

The proposed analytical strategy allows utilities to have an overall understanding of the major contributing factors to transmission line reliability issues, as well as to predict reliability performance trends in the near future.


Transmission Line Components, TADS, SAIFI, Delivery Point, Outage Data, Component Degradation, Outage Failure Rate