Short rural feeder means a feeder with a total feeder route length less than 200 km, which is not a CBD feeder or urban feeder. Long rural feeder means a feeder with a total feeder route length greater than 200 km, which is not a CBD feeder or urban feeder. We agree with these new definitions for feeder classifications to be adopted in the STPIS. Questions 9. The AER would like views on the current definitions of the feeder classifications. 10. Historically, only feeders supplying the central business districts of the capital cities of each jurisdiction have been classified as CBD feeders for STPIS purpose. Should this practice be maintained? Planned interruptions Planned interruptions are necessary for the maintenance, repair and replacement of the distribution system. Planned Interruption means an intentional disconnection of customers' premises where the customer has been provided with prior notification of the interruption in accordance with all applicable laws, rules and regulations. Distributors must provide a minimum of four-days-notice for the planned interruption. With sufficient notice, the impact of planned interruption to the consumer can be significantly less than that of an unplanned interruption. However, there is still some cost to consumers from a planned interruption. Further, not all customers have the same preference for the outage time and the duration of a planned interruption is typically mush greater than that of an unplanned interruption. For example, commercial and industrial consumers may prefer to not have planned interruptions during normal working hours, whereas restaurants and residential customers may prefer to not have planned interruptions during weekend and Friday evenings. Some customers may need to use a temporary generator during the interruption and this is represents a cost to that consumer. In some cases, the distributor may be able to modify the proposed works to reduce the impacts of a planned interruption on affected consumers. Moving planned works to the a time that suits the consumer, reducing the duration of the planned works or undertaking the works via 'live line' techniques may be possible alternatives. The distributor is likely to incur additional costs to undertake planned works outside normal working hours, or via 'live line' techniques. Therefore there is a trade-off between the cost to undertake the planned works and minimising the impacts on consumers.
Appendix E. Common reliability measures definitions and AER's preliminary views AEMC’s recommended definitions AER preliminary views Part 1 Measurements – SAIFI, MAIFI and MAIFIe or System Average Interruption Duration Index in respect of a relevant period, means the sum of the durations of all the Sustained Interruptions (in minutes) that have occurred during the relevant period, divided by the Customer Base. The AER supports this definition for the distribution reliability measures guidelines. The AER proposes to undertake a more detailed review to implement this definition under the STPIS. SAIFI or System Average Interruption Frequency Index in respect of a relevant period, means the total number of Sustained Interruptions that have occurred during the relevant period, divided by the Customer Base. As or Momentary Average Interruption Frequency Index in respect of a relevant period, means the total number of Momentary Interruptions that have occurred during the relevant period, divided by the Customer Base, provided that Momentary Interruptions that As above.
Days may be excluded from such calculations. Feeders – The calculations may be limited to CBD feeders, urban feeders, short rural feeders, long rural feeders or a combination of such feeders. limitations under STPIS. Part 2 - Definitions Catastrophic event means a large scale event (such as a cyclone, flood or bushfire) that is identified by: - applying a 4.15 multiple to the log standard deviation used in the statistical method set out in section 3.5 of the IEEE or - such other statistical method determined by the regulator to more accurately identify large scale events. The AER supports this definition for the distribution reliability measures guidelines. The AER proposes to undertake a more detailed review order to implement this definition under the STPIS. CBD feeder means a feeder in one or more geographic areas that have been determined by the relevant participating jurisdiction as supplying electricity to predominantly commercial, buildings, supplied by a predominantly underground distribution network containing significant interconnection and redundancy when compared to urban areas. The AER supports this definition for the distribution reliability measures guidelines and STPIS.
Interruption means any loss of electricity supply to Distribution Customers associated with an outage of any part of the network, including outages affecting a single Customer’s premises but excluding disconnections caused by a retailer or a fault in electrical equipment owned by a Customer, provided that: the start of an Interruption is taken to be when the Interruption is initially automatically recorded by equipment such as SCADA or, where such equipment does not exist, at the time of the first Customer reports that there has been an outage in the network; and the end of an Interruption is taken to be when the Interruption is automatically recorded as ending by equipment such as SCADA or, where such equipment does not exist, the time when electricity supply is restored to affected Distribution Customers The AER supports this definition for the distribution reliability measures guidelines. The AER proposes to undertake a more detailed review to implement this definition under the STPIS. long feeder means a feeder with a total feeder route length greater than 200 km, which is not a CBD feeder or urban feeder. The AER supports this definition for the distribution reliability measures guidelines and STPIS.
Major Event Day has the meaning given in the IEEE Guide, provided that: for the purposes of applying an economic incentive scheme, the regulator may apply a different multiple of log standard deviation than the 2.5 multiple used in the statistical method set out in section 3.5 of the IEEE Guide should such multiple be determined by the regulator to more accurately reflect the normal operation of the distribution network; and Catastrophic events may be excluded from the statistical method used to classify Major Event Days. The AER broadly supports adopting this definition for the distribution reliability measures guidelines. The AER proposes to undertake a more detailed review order to implement this definition under the STPIS. Momentary Interruption an Interruption to a Distribution Customer’s electricity supply with a duration of 3 minutes or less, provided that the end of each Momentary Interruption is taken to be when electricity supply is restored for any duration The AER broadly supports adopting this definition for the distribution reliability measures guidelines. The AER proposes to undertake a more detailed review order to implement this definition under the STPIS. Momentary Interruption Event means one or more Momentary Interruptions that occur within a continued duration of 3 minutes or less, provided that the successful As above.
restoration of electricity supply after any number of Momentary Interruptions is taken to be the end of the Momentary Interruption Event. National electricity legislation has the meaning given in the National Electricity Law. The AER supports adopting this definition for the distribution reliability measures guidelines and STPIS. outage means the loss of ability of a component to deliver electrical power. As above. Planned Interruption means an Interruption resulting from a Distribution Network Service Provider’s intentional interruption of electricity supply to a Customer’s premises where the Customer has been provided with prior notification of the Interruption in accordance with all applicable laws, rules and regulations. The AER broadly supports adopting this definition for the distribution reliability measures guidelines. The AER proposes to undertake a more detailed review order to implement this definition under the STPIS. SCADA or Supervisory Control and Data Acquisition means a system employed to gather and analyse real-time data in respect of network related infrastructure. The AER supports adopting this definition for the distribution reliability measures guidelines and Short rural feeder means a feeder with a total feeder route length less than 200 km, which is not a CBD feeder or urban feeder. As above.
2. Automatic load shedding due to the operation of under-frequency relays following the occurrence of a power system under-frequency condition. 3. Load shedding at the direction of AEMO or a System Operator. 4. Load interruptions caused by a failure of the shared transmission network. 5. Load interruptions caused by a failure of transmission connection assets except where the interruptions were due to inadequate planning of transmission network connections points and the Distribution Network Service Provider is responsible for the planning of transmission network connection points. 6. Load interruptions caused by the exercise of any obligation, right or discretion imposed upon or provided for under jurisdictional electricity legislation and national electricity legislation applying to a Distribution Network Service Provider. 7. Load interruptions caused or extended by a direction from state or federal emergency with the STPIS. Support. This is consistent with the STPIS. Support. This is consistent with the STPIS. Support. This is consistent with the STPIS. Support. This is consistent with the STPIS. Support. This is consistent with the STPIS. Support. The AER intend to the STPIS to reflect this exclusion.