January 2012 Capital Investment - National Grid

More documents

Recommendations

Info

Exhibit ___ (EIOP-19)Page 87 of 684Heavily Loaded Line TransformerThe distribution line transformer strategy endeavors to mitigate outage/failure risks dueto overloading of distribution service transformers. Transformer loading is reviewedannually via reports generated from the customer use information within theGeographical Information System (GIS). Transformers with calculated demandsexceeding load limits specified in the applicable Construction Standard are identified andinvestigated in the field.Heavily loaded units are to be systematically removed from the system over the nextfifteen years. Replacement levels may be adjusted based on changes to loading levels,the condition of the population and budget constraints.Drivers:There are approximately 250 transformer failures per year due to overloading whichaffect approximately 3,700 customers annually. Proactive management of equipmentloading through annual review has prevented overloaded transformers from becoming asignificant system performance problem.Customer Benefits:The main benefit of this strategy is that asset utilization will be maximized by maintainingunits in service until such point that replacement is required as identified throughrecurring loading reviews or visual and operational inspection, recognizing thattransformer life expectancy is predominantly affected by loading and environmentalfactors rather than age. Implementation of this strategy will ensure the sustainability ofthis asset class over time and maintain its relatively minor impact on overall systemreliability and customer satisfaction.2011 to 2012 Variance:The projected investment is shown in the table below.Table IV-7Heavily Loaded Line TransformerProgram Variance ($millions)CIP FY12 FY13 FY14 FY15 FY16 FY17 Total2011 3.7 3.0 3.2 3.6 3.7 - 17.12012 - 3.0 3.2 3.6 3.7 3.9 17.3IV-11 1188
Exhibit ___ (EIOP-19)Page 88 of 684Remote Terminal Unit (RTU)This strategy covers the addition of Remote Terminal Units (RTUs) and relatedinfrastructure at substations presently lacking remote monitoring and control capabilities.RTUs in substations communicate with the EMS (Energy Management Systems) andprovide the means to leverage substation data that provide operational intelligence andsignificantly reduce response time to abnormal conditions through real time monitoringand control.There is also a significant investment in replacing outdated RTUs based on their assetcondition. That investment is documented in the Asset Condition spending rationalesection, and in Chapter II in the Statutory and Regulatory spending rationale section.Drivers:RTUs will allow for remote operation and management of the system at these stationsproviding benefits in contingency response and recovery and thus improvingperformance and reliability. In addition, RTUs are key components of automation andmodernization of the Company’s infrastructure.Customer Benefits:This strategy provides the means to leverage operational intelligence and significantlyreduce response time to abnormal conditions through real time monitoring and control.The strategy also enables the distribution automation, sub-transmission automation, andfuture modernization strategies which will improve service to customers. When used tomonitor and control the distribution feeder breakers and associated feeder equipment,RTUs and EMS facilitate the isolation of faulted equipment and the time required toreconfigure the distribution system to re-energize customers in non faulted segments ofthe distribution system. This switching flexibility improves the expected averagecustomer outage duration (CAIDI) when compared with a similar feeder that is notequipped with these facilities.2011 to 2012 Variance:The projected investment is shown in the table below. The variance below is based alevelized expansion program year on year.Table IV-8Remote Terminal UnitProgram Variance ($millions)CIP FY12 FY13 FY14 FY15 FY16 FY17 Total2011 2.9 2.8 4.4 4.4 4.4 - 18.92012 - 2.8 2.8 2.7 2.7 2.7 13.5IV-12 1289
Page 1 and 2:
Niagara Mohawk Power Corporationd/b
Page 3 and 4:
Testimony of Electric Infrastructur
Page 5 and 6:
Exhibit ___ (EIOP-19)Page 2 of 684T
Page 7 and 8:
Exhibit ___ (EIOP-19)Page 4 of 684s
Page 9 and 10:
Exhibit ___ (EIOP-19)Page 6 of 684A
Page 11 and 12:
Exhibit ___ (EIOP-19)Page 8 of 684M
Page 13 and 14:
Exhibit ___ (EIOP-19)Page 10 of 684
Page 15 and 16:
Page 17 and 18:
Page 19 and 20:
Page 21 and 22:
Page 23 and 24:
Page 25 and 26:
Page 27 and 28:
Page 29 and 30:
Page 31 and 32:
Page 33 and 34:
Page 35 and 36:
Page 37 and 38:
Page 39 and 40: Exhibit ___ (EIOP-19)Page 36 of 684
Page 89: Exhibit ___ (EIOP-19)Page 86 of 684
Page 141 and 142:
Page 143 and 144:
Page 145 and 146:
Page 147 and 148:
Page 149 and 150:
Page 151 and 152:
Page 153 and 154:
Page 155 and 156:
Page 157 and 158:
Page 159 and 160:
This document has been redacted for
Page 161 and 162:
Page 163 and 164:
Page 165 and 166:
Page 167 and 168:
Page 169 and 170:
Page 171 and 172:
Page 173 and 174:
Page 175 and 176:
show all

January 2012 Capital Investment - National Grid

Create successful ePaper yourself

Delete template?

Save as template?