The OMS is a system which combines the trouble call centre and DMS tools to identify, diagnose and locate faults, then isolate the faults and restore supply. It provides feedback to customers that are affected. It also analyses the event and maintains historical records of the outage as well as calculating statistical indices of interruptions. The information flow of an OMS is shown in Figure 7.18. Outage management is important in distribution networks with goals (and sometimes penalties) to restore the supply to a faulted section of the network within a period of time. The main functions of each part of OMS are as follows.