FAULT LEVEL MONITOR

摘要

In substation (10), an incoming feeder (11) provides power which is distributed via busbar (12) to multiple outgoing feeders (13). Each outgoing feeder is attached to a load (14). A monitoring device (21) is provided on each outgoing feeder. Disturbances in voltage and/or current on each outgoing feeder (13) from said substation are identified by the monitoring means (21) provided for each outgoing feeder (13). Subsequently, each disturbance can be used to calculate an individual quantity indicative of the prospective fault level for that feeder based on the magnitude of each identified disturbance for each outgoing feeder (13). Accordingly, the prospective fault level can be separately assessed for each individual feeder. Additionally, by collating information on the individual outgoing feeders, an overall substation prospective fault level can be determined and used to assess the potential effects of an additional outgoing feeder being added to the substation. In addition to dedicated monitoring means (21) for each outgoing feeder (13), a monitoring means (21) can also be provided on the incoming feeder (11). In such cases, disturbances on the incoming feeder (11) can be used to calculate a substation incoming fault infeed and the calculated incoming and outgoing prospective fault levels may be compared or collated to provide overall prospective fault level information.