January 2012 Capital Investment - National Grid

More documents

Recommendations

Info

Exhibit ___ (EIOP-19)Page 107 of 684Substation Circuit Breakers and ReclosersAs noted in the annual asset condition report, 10 certain types, or families, of breakershave been specifically identified for replacement in the next ten years. Breaker familiesare typically older, obsolete units that are less safe or less reliable. Certain breakerfamilies that are targeted for replacement contain parts that must be custom machinedor units that contain asbestos in the interrupting systems and require extra precautionsduring maintenance, refurbishment and overhaul.Drivers:The approach for breaker condition coding was based on engineering judgment andexperience which was supported by discussion with local Operations personnel. Theunits are prioritized for replacement based on the condition coding; units in poorercondition are given a higher score. Many of these breakers are obsolete.Aged units have been specifically identified for replacement because they are difficult torepair due to the lack of available spare parts. Likewise, unreliable units have beenidentified for replacement since their replacement would reduce the number of customerinterruptions.Customer Benefits:Several of the targeted breaker families present opportunities to reduce hazardsassociated with safety and the environment (i.e. oil and asbestos).2011 to 2012 Variance:The projected program investment is shown in the table below. Replacements will beaddressed programmatically and identified through the Asset Condition Report. Therecent identification for replacement of 115kV breakers that are FERC designated asdistribution assets resulted in the FY14 and FY15 variance to last year’s plan. Themajority of 115kV breaker replacements can be found in Chapter II related to thetransmission system.Table IV-23Circuit Breakers and ReclosersProgram Variance ($millions)CIP FY12 FY13 FY14 FY15 FY16 FY17 Total2011 2.3 3.0 4.5 6.0 6.8 - 22.62012 - 3.0 6.5 7.0 6.8 6.8 30.010 Report on the Condition of Physical Elements of Transmission and Distribution Systems, Case06-M-0878, October 1, 2011, page II-118.IV-31 31108
Exhibit ___ (EIOP-19)Page 108 of 684Substation Batteries and RelatedThis program mirrors the Transmission Substation Batteries and Chargers program.Battery and charger systems are critical components that are needed to ensuresubstation operational capability during both normal and abnormal system conditions.The intent of this program is to replace battery and charger systems that are 20 yearsold. The 20 year limit is based on industry best practice and experience in managingbattery systems. This program work is coordinated with other asset replacementprograms where appropriate.Currently, there are over 200 substation batteries in service. To bring all batterysystems to less than twenty years old within ten years would require a replacement rateof approximately nine per year.Individual battery problems may arise at any time during Visual and Operationalinspections or periodic testing. Problems identified through these methods areaddressed under the Damage/Failure spending rationale.Drivers:Failure of batteries and charger systems may result in substation protective relaysand/or circuit breakers not operating as designed.Customer Benefits:This can result in additional customers being interrupted as back-up relay schemes atremote substations will have to isolate a fault. It may also result in equipment damage ifa fault is not cleared in a timely fashion. Interruptions related to battery incidents areuncommon at this time as the replacement program is working as desired.2011 to 2012 Variance:The projected program investment is shown in the table below. The budget has beenreduced because significant progress has been made in replacing batteries that are 20years or over.Table IV-24Substation Battery and RelatedProgram Variance ($millions)CIP FY12 FY13 FY14 FY15 FY16 FY17 Total2011 1.1 1.1 1.1 1.1 1.1 - 5.52012 - 1.1 1.1 1.1 0.9 0.9 5.0IV-32 32109
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:
Page 41 and 42:
Page 43 and 44:
Page 45 and 46:
Page 47 and 48:
Page 49 and 50:
Page 51 and 52:
Page 53 and 54:
Page 55 and 56:
Page 57 and 58:
Page 59 and 60: Exhibit ___ (EIOP-19)Page 56 of 684
Page 109: Exhibit ___ (EIOP-19)Page 106 of 68
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

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?