N-1Redacted Work Order 9/2/2010
9 passages
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.
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.
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.
(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.
(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.