These are the  cascading failure chain databases for IEEE 39-bus and 118-bus systems under the initial generation and load state.

The failure chain is triggered by a cascading failure simulator using N-1 security test.

For database 'fcdb~~~.mat', specifically, the first number indicates the system and the second number is the Load Loss Threshold. Moreover, in database, 'P_line_sum' is the power flow interface of each failure generation in each cascading failure chain, 'link_sum' is the failed lines of each failure generation in each cascading failure chain, and 'P_loss' is the total load loss for each chain.

Additionally, 'capMatrix~~~.mat' are the initial  maximum allowed conductor powers for each line in IEEE 39-bus and 118-bus systems.

For the details of cascading failure simulator, you can check them from 'Analyzing Patterns Transference and Mitigation of Cascading Failures with Interaction Graphs'.
