Topic:"Infrastructure Planning" in M03512

No other projects in 200S,2009,2010,2011 and 2012 D301 4/20/2010 2010 07/05 Forecast Variance 0 717 0 0 0 0 4,092 15,102 5,841 49,327 14,128 9,252 0 201 0 62,220 3,290 591 35,462 1,366 26,181 (27,500) 42 83 272,954 0 9 18 75 146 0 473,599...

AI summary This table lists projects related to infrastructure planning in Nova Scotia, including details such as dates, forecasts, variances, and costs associated with the Halifax UG Cable Replacement project. It includes various line items and cost categories, but no specific regulatory or policy discussions are mentioned.

Why do this project? This project is required to replace deteriorated underground 25kV cables and accessories in the Halifax Underground System.

AI summary This project is necessary to replace deteriorated underground 25kV cables and accessories in the Halifax Underground System, addressing infrastructure degradation to maintain reliable power distribution.

Why do this project now? This project is part of a plan to begin replacing cables that have reached the end of their useful life. Cables installed in the early 1970's have now reached the end of their useful life; estimated at 35 years.

AI summary This project aims to replace aging cables installed in the early 1970s, which have reached the end of their 35-year useful life, necessitating infrastructure maintenance to ensure reliability.

Why do this project this way? Due to the age of the underground cables, a planned replacement program is scheduled to take place over the next several years. This work is being completed by NSPI. Parent CI Number Approved Date 4/20/2010 CI...

AI summary The underground cable replacement project is being carried out by NSPI due to the age of the cables. The variance in costs is mainly due to lower NSPI labor and overheads than initially estimated, partially offset by a decrease in salvage value.

DISTRIBUTION CAPITAL INVESTMENT REPORT HALIFAX 25 kV UNDERGROUND SYSTEM Draft October 05, 2009

AI summary This document is a draft of the Distribution Capital Investment Report for the Halifax 25 kV Underground System, dated October 5, 2009, outlining capital expenditures related to the system's infrastructure.

6.0 CABLE INJECTION - 6.1 Description - 6.2 Scope - 6.3 Cable Replacement Part of the Cable Injection Option - 6.4 Injection Estimates

AI summary Section 6.0 outlines the 'Cable Injection' process, including its description, scope, cable replacement as part of the option, and injection estimates. The section structures the analysis of this infrastructure-related initiative without providing detailed data or arguments.

Objective The purpose of this report is to identify the requirements necessary to perform the cable replacement program in Downtown Halifax.

AI summary This report aims to outline the requirements needed to execute a cable replacement program in Downtown Halifax, focusing on the infrastructure and logistical needs for the project.

Scope The scope of the report is limited to 25 kV feeders interconnected around the pole-free area of Downtown Halifax. The main components of the report are: overview of the present system configuration, review of the historic load check,...

AI summary The report's scope is limited to 25 kV feeders in Downtown Halifax's pole-free area, covering system configuration, load checks, cable inventory, manhole assessments, contingency analysis, improvement proposals, and timelines. It excludes the 4 kV system and substation contingencies.

Recommendations This report recommends that the replacement project be carried out over the next 5 years. The required expenditures have been prioritized. This report has considered the age of plant, the loading of the system from PI data...

AI summary The report recommends a 5-year cable replacement project prioritized based on plant age, system loading from PI data, and customer reliability. It also suggests two new tie links to improve switching flexibility before cable replacement, along with chemical injection to prolong cable life.

2.0 PRESENT SYSTEM CONFIGURATION Fig. 2.1 Simplified Feeder Diagram The diagram on Fig. 2.1 is a simplified combination of an electrical single line diagram and a geographical layout of the Halifax UD system. For simplicity, only open poin...

AI summary The document presents a simplified feeder diagram combining an electrical single-line diagram and a geographical layout of the Halifax UD system, highlighting open points (except for Scotia Square) to illustrate the current system configuration.

2.1 UNDERGROUND FEEDER PROFILES The feeder profiles below describe each of the six underground feeders in a uniform format that will allow for easy comparison and quick reference further in the report. The underground feeders are: 1H-403,...

AI summary The section outlines six underground feeders (1H-403, 1H-405, 1H-419, 1H-424, 1H-429, 1H-431) in a standardized format for easy comparison and reference in the report.

5 of 6 1H-429 FEEDER PROFILE V.G. Hospital Total feeder length 2.2 km (including services) Built 1990's Route Water, Morris, 10H Installed MVA 11.2 Interties with feeders 2H-412 Loops N/A Stepdowns 10H-T1 VG - North Bus Primary services N/...

AI summary The text provides detailed technical profiles of electrical feeders, including their lengths, construction dates, routes, and load profiles for the period ending June 1, 2008. It includes data on underground and overhead feeders, their capacities, and historical load checks from 2004 to 2008.

3.0 FEEDER CONTINGENCIES The purpose of this contingency categorization is to help identify feeders with switching limitations and to help draw the line between "Possible" and "Practical" as applied to a planned power outage to a part of t...

AI summary This section outlines the purpose of categorizing feeder contingencies to identify switching limitations and distinguish between 'Possible' and 'Practical' approaches for planned power outages, emphasizing that techniques viable for system failures may not apply to planned outages.

1H-419 There are several options. During summer time the simple options become questionable. Splitting the load between 1H-431 and 1H-403 or 104H-422 would be the next option.

AI summary The text discusses options for managing load during summer, suggesting splitting the load between different systems (1H-431, 1H-403, 104H-422) as a potential solution. It implies considerations related to infrastructure planning or operational strategies.

1H-424 Feeder 1H-405 is a reliable backup for 1H-424. New feeder.

AI summary Feeder 1H-405 is identified as a reliable backup for Feeder 1H-424, with the latter designated as a new feeder. The text highlights infrastructure reliability and modernization considerations for power distribution systems.

1H-429 Complicated switching to offload the 10H-T1 transformer between 2H-412 and 104H-413. The load situation at 4 kV is expected to improve and therefore the above offloading should become more reliable. There is a suspicion of a collaps...

AI summary The text describes challenges with switching offloads on a transformer between 2H-412 and 104H-413, noting expected reliability improvements due to a better 4 kV load situation. It also references concerns about a potential collapsed ductbank on Morris St., with ongoing investigations since Summer 2008, and notes the feeder's recent installation.

1H-431 The only simple backup option for this feeder is 1H-419. This option becomes questionable during summer months. For improved switching flexibility this feeder may require additional intertie. See 4.1 for details. This may be especia...

AI summary The document evaluates backup options for electrical feeders, noting that feeder 1H-431 has a questionable backup with potential outage risks. Feeders 1H-403, 1H-419, and 1H-429 require improved backup, while 1H-405 and 1H-424 have reliable options. Additional intertie infrastructure is recommended for 1H-431 to enhance reliability.

4.1 ART GALLERY TIE To improve the backup options for feeders 1H-431 and 1H-419 a new tie connection is recommended between the Art Gallery vault and feeder 1H-424 in manhole #13 on Lower Water Street. This will create a simple and reliabl...

AI summary A new tie connection between the Art Gallery vault and feeder 1H-424 is proposed to enhance backup options for feeders 1H-431 and 1H-419. The project involves extending ducts and installing cables to create a reliable contingency option, supporting future cable replacement or treatment programs.

4.2 SCOTIA SQUARE TIE The main purpose of this proposal is to improve the backup options of the feeder 1H-403. The idea is to use the existing 3-way Vista switch at the Scotia Square vault as a universal tie for 1H-403, 1H-405 and 1H-424 f...

AI summary The proposal aims to enhance backup options for feeder 1H-403 by repurposing the existing 3-way Vista switch at Scotia Square vault as a universal tie point for multiple feeders, improving system flexibility and reliability through parallel connections.

4.3.1 Configuration Improvements of 1H-431 Converting the o/h portion of the feeder 1H-431 would benefit the reliability of the Halifax underground system. There are six riser poles around the intersection of Hollis and Morris Streets that...

AI summary The document discusses converting the overhead portion of feeder 1H-431 to improve reliability in Halifax's underground system. Key upgrades include extending ductbanks, installing a new manhole with a submersible switch, and replacing inline switches. The project requires HRM's support under the existing cost-sharing agreement with NSPI.

4.3.2 Cable Upgrades There are two potential bottlenecks in the existing system that may be considered for an upgrade. The purpose is to increase the conductor size to the full size feeder (750 kcmil) between the Metro Center and Scotia Sq...

AI summary The text identifies two potential bottlenecks in the existing power system requiring upgrades to increase conductor size to 750 kcmil between specific locations. However, the current ductbank configuration limits implementation to only one of the two upgrades.

Summary: The total length underground feeders including primary services (6 feeders): 22770 m Same for the feeders over 30 years old (4 feeders) – 18620 m This includes the feeder sections: - a) Radial 8780 m - b) Loops 6990 m - c) Ties 65...

AI summary The text details the total length of underground feeders and primary services, including 22,770 meters across six feeders and 18,620 meters for four feeders over 30 years old, with breakdowns by radial, loop, tie, and primary service sections.

(A) 1H-403 – Main Radial from 1H to 28H-416 The replacement of this part of the feeder can be approached in two ways:

AI summary The document outlines two approaches for replacing the Main Radial from 1H to 28H-416, though specific details of the approaches are not provided in the excerpt. The focus is on infrastructure planning and grid modernization for this transmission line segment.

Option 1 Use an alternative supply for 1H-403 (See 3.2 Contingency Options). Deenergize the radial part of the feeder between 1H and 28H-416 (approx. 1.4 km) and replace it.

AI summary Option 1 proposes using an alternative supply for 1H-403 and replacing the radial part of the feeder between 1H and 28H-416 (approx. 1.4 km) as a contingency measure. This involves deenergizing and replacing the existing infrastructure.

Option 2 Remove the old 4 kV cables 1H-243, 1H-246 and 1H-247 (#500, 3 phase PILC) along the Lower Water, Sackville and Granville Streets between 1H and MH46 (1 km). Install new cables in the freed-up ducts while the existing feeder cables...

AI summary Option 2 proposes replacing aging 4 kV cables along specific streets while maintaining service via existing feeders, freeing ducts for future upgrades, and salvaging old equipment. It addresses PCB management in cables, referencing environmental regulations. The plan avoids alternative supply for 90% of the radial section but requires temporary alternatives for the remaining segment due to insufficient duct space.

(B) 1H-403 – North Loop from 28H-410 to L431-229 Metro Center There are three sizes of conductors in the loop: 350, 500 and 750 kcmil. It may be beneficial to upgrade a part of the loop between MH102 on Cogswell St and 28H to 750 kcmil to...

AI summary The document discusses upgrading the North Loop between MH102 and 28H to 750 kcmil conductors to create a full-size tie between two feeders. Two conditions are outlined: re-routing cables in MH43 to make the tie 'service free' and addressing limited duct availability between 28H and MH32 requiring further investigation.

(C) 1H-403 –Metro Center Loop from L431-230 to L431-232 This part of the feeder has enough spare ducts to pre-install the new switch-to-switch sections while the old cable remains in service. The switching between the old and new cable can...

AI summary The Metro Center Loop segment from L431-230 to L431-232 has sufficient spare ducts to install new switch-to-switch sections without disrupting existing cable service, allowing for seamless switching and avoiding customer outages during upgrades.

(E) 1H-403 – 28H-411 to L431-230 Metro Center – Tie with 1H-405 There are two sizes of conductors (500 and 750 kcmil) used in this tie. The 500 kcmil section should be upgraded to the standard 750 kcmil size. There are only two free ducts...

AI summary The document discusses upgrading conductors from 500 to 750 kcmil due to limited duct availability, necessitating a choice between two mutually exclusive upgrades and exploring additional duct options.

(F) 1H-405 – Main Radial from 1H to 28H-417 This part of the feeder is very similar to 1H-403 (A) and can be approached in the same way. See section (A) options for details. The removal of the old 4 kV feeder cables will also benefit the 1...

AI summary The feeder section 1H-405 shares similarities with 1H-403 and can be addressed using similar approaches. The removal of old 4 kV cables will benefit the replacement process for this feeder.

(G) 1H-405 – 23 kV Loop The old multi-loop configuration was recently changed. The exact configuration of the present system may need to be updated on the single line diagrams. The upcoming cable replacement may also be used as an opportun...

AI summary The 23 kV loop system's configuration was recently updated, necessitating revisions to single-line diagrams. The cable replacement project presents an opportunity to further optimize the existing 23 kV loop infrastructure.

(I) 1H-419 – L431-404 Proctor Street to L431-211 Art Gallery Vault The layouts of manholes MH90, MH91 and MH92 need to be verified and completed.

AI summary The document specifies that the layouts of manholes MH90, MH91, and MH92 require verification and completion as part of the infrastructure work between Proctor Street and the Art Gallery Vault.

(L) 1H-431 to Art Gallery Vault The records on the available spare ducts are inconsistent. A detailed scoping is required. The system improvement option 4.1 is recommended for better contingency arrangements. - - 5.4 Budgeting for Cable Re...

AI summary The document highlights inconsistencies in records for spare ducts, necessitating detailed scoping. System improvement option 4.1 is recommended for enhanced contingency planning. A section on budgeting for cable replacement, including estimates and assumptions, is outlined.

6.2 Scope Following is a planned scope of injection work grouped by feeder# and section# (see Fig. 5.3). The sections will be (a) terminated at switching devices using livefront or deadfront terminations and (b) spliced using 600A deadbrea...

AI summary The scope outlines injection work details, including termination methods (livefront/deadfront), splicing with 600A deadbreak T-body, and locations in manholes/vaults. Section lengths are simplified for accuracy in total length estimates.

Feeder 1H-405 (1680 m) Section F: 230+230+230+230+230+270=1440 Section G: 240 Three phase cable sections: 7 Terminations: 42

AI summary Feeder 1H-405 details include Section F (1440 units), Section G (240 units), 7 three-phase cable sections, and 42 terminations. The data outlines infrastructure specifications for the 1680-meter feeder.

Risks associated with cable injection: - a. A variety of first generation polyethylene insulation cable will remain in service. - b. After removing of the old terminations and splices some of the cables may be too short for a quality splic...

AI summary The text outlines risks of cable injection, including handling old cables, replacement needs, warranty limitations, coordination challenges, and unforeseen costs. Key issues involve physical and electrical constraints, warranty exclusions, and the use of non-standard hardware.

8.0 BUDGETARY TIMELINES Year 1, 2 and 3 – replace radial sections of the feeders 1H-403, 405, 419 and 431 Year 4 and 5 – replace loops and ties of the feeders 1H-403, 405 and 419 - 2010: a) 1H-403 radial section between 1H and 28H-416 Scot...

AI summary The document outlines a multi-year infrastructure plan for replacing radial sections, loops, and ties of specific electrical feeders (1H-403, 405, 419, 431) between 2010 and 2014, detailing metered lengths and project phases.