January 2012 Capital Investment - National Grid

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Exhibit ___ (EIOP-19)Page 105 of 684Metal-Clad SwitchgearDeteriorated metal-clad switchgear can be prone to water and animal ingress whichleads to failures from moisture, dust or animals. Visual surveys will detect suchdegradation, but cannot identify surface tracking where hidden behind metal enclosures.Identification of these concerns is more likely with electro-acoustic detection techniques.By using sensors to detect anomalous sound (acoustic) waves or electric signals in themetal-clad switchgear, it is possible to identify equipment condition concerns beforefailure. An initial review using this technique identified a number of locations for furtheraction as part of this strategy. 9For each substation, an analysis will be conducted to determine if direct replacement isthe best course of action or if an alternate means of supplying the load will beconstructed.Drivers:Metal-clad switchgear installed prior to 1970 have several factors that can lead tocomponent failure. Electrical insulation voids were more prevalent in earlier vintageswitchgear. Higher temperatures due to poor ventilation systems can degradelubrication in moving parts such as breaker mechanisms; and, gaskets and caulkingdeteriorate over time leading to ingress of moisture.Customer Benefits:The impact of each metal-clad switchgear event on local customers is usuallysubstantial, with nearly 3,000 customers interrupted for over three hours per event. Thisprogram would reduce the risk of such events and provide significant benefit to theaffected customers.2011 to <strong>2012</strong> Variance:The projected program investment is shown in the table below. The capital forecastreflects new condition assessment data and analysis which helped identify and prioritizereplacement candidates. Multiple stations are in progress with a program in progress toprioritize additional stations.Table IV-22Metal-Clad SwitchgearProgram Variance ($millions)CIP FY12 FY13 FY14 FY15 FY16 FY17 Total2011 1.6 1.8 2.8 3.8 3.5 - 13.4<strong>2012</strong> - 1.1 2.0 5.2 3.9 4.1 16.4There is separate funding shown in Chapter III for the sub-transmission system.9 Report on the Condition of Physical Elements of Transmission and Distribution Systems, Case06-M-0878, October 1, 2011, pg. II-111.IV-29 29106
Exhibit ___ (EIOP-19)Page 106 of 684The following specific projects will exceed $1 million in any fiscal year:• Project C32296, Altamont Substation Replace Metal-Clad Switchgear. Thisproject provides for the replacement of the existing metal-clad switchgear withnew position metal-clad switchgear.• Project C32298, Market Hill Substation Replace Metal-Clad Switchgear. Thisproject provides for a new substation located near Maple Ave in the Town ofAmsterdam to replace the existing Market Hill Substation.• Project C17952, Emmet Street Substation Replace Transformer Bank 1 andMetal-Clad Switchgear. This project provides for the replacement of the existingmetal-clad switchgear with new position metal-clad switchgear.• Project C36213, Chrisler Substation Replace Metal-Clad Switchgear. Thisproject provides for the replacement of the existing metal-clad switchgear withnew position metal-clad switchgear.• Project Candidate, Union Street 376 Substation Replace Metal-Clad Switchgear.This project provides for the replacement of the existing metal-clad switchgearwith new position metal-clad switchgear.• Project Candidate, Johnson Road Substation Replace Metal-Clad Switchgear.This project provides for the replacement of the existing metal-clad switchgearwith new position metal-clad switchgear.• Project Candidate, Pinebush Substation Replace Metal-Clad Switchgear. Thisproject provides for the replacement of the existing metal-clad switchgear withnew position metal-clad switchgear.• Project Candidate, Hopkins 253 Substation Replace Metal-Clad Switchgear.This project provides for the replacement of the existing metal-clad switchgearwith new position metal-clad switchgear.• Project Candidate, Whitesboro 632 Substation Replace Metal-Clad Switchgear.This project provides for the replacement of the existing metal-clad switchgearwith new position metal-clad switchgear.• Project Candidate, Henry Street Station 316 Replace Metal-Clad Switchgear.This project provides for the replacement of the existing metal-clad switchgearwith new metal-clad switchgear.IV-30 30107
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January 2012 Capital Investment - National Grid

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