Research Article
Reliability-Centered Maintenance for Overhead Transmission Lines in Composite Power System
Table 2
Grouping the transmission lines based on the number of annual failures.
| | No. of failures per year | No. of lines in each group |
| | Low (n < 0.5) | 132 | | Medium (0.5 ≤n < 1.5) | 59 | | High (1.5≤n < 2.5) | 14 | | Extra high (n ≥ 2.5) | 14 |
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