
1-2,3-4 73.58 III 96.36 I 95.04 II 

2-4,2-5 114.00 I 114 I 104.00 II 

1-2,2-5 122.80 II 124.4 I 121.80 III 

1-2,2-4 107.50 III 109.6 II 112.00 I 

1-3,2-5 115.30 I 114 II 104.00 III 

1-3 92.10 II 93.8 I 80.40 III 

2-4 104.00 I 101.6 II 95.80 III 

Table -8 Comparison of Critical Bus Ranking using Fuzzy Approach and FVSI 
Method Table 7 gives the Criticality Index and rank for the load buses under selected line outage contingencies. It can be observed that for most of the outages, bus 3 is the most critical bus and bus 5 is less critical. Table 8 provides the comparison of ranking obtained from Fuzzy approach and FVSI method. The rankings obtained from proposed method are very close to the results obtained using FVSI method. 

The fuzzy approach effectively ranks the critical buses eliminating the masking effect. The advantage of the proposed method is that it provides the 

| Contingency   | Bus No. 3   | Bus No. 4   | Bus No. 5   |       |      |     |
|---------------|-------------|-------------|-------------|-------|------|-----|
| Fuzzy         | FVSI        | Fuzzy       | FVSI        | Fuzzy | FVSI |     |
| approach      | approach    | approach    |             |       |      |     |
| 1-2           | I           | II          | II          | I     | III  | III |
| 2-5           | I           | I           | II          | II    | III  | III |
| 1-2,2-3       | I           | I           | II          | II    | III  | III |
| 2-3,2-5       | I           | I           | I           | II    | II   | III |
| 2-5,3-4       | I           | I           | II          | II    | III  | III |
| 1-2,3-4       | III         | III         | I           | I     | II   | II  |
| 2-4,2-5       | I           | I           | I           | II    | II   | III |
| 1-2,2-5       | II          | II          | I           | I     | III  | III |
| 1-2,2-4       | III         | III         | II          | II    | I    | I   |
| 1-3,2-5       | I           | I           | II          | II    | III  | III |
| 1-3           | II          | II          | I           | I     | III  | III |
| 2-4           | I           | II          | II          | I     | III  | III |
