N-1Redacted Work Order 9/2/2010
7 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.
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.
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.
3.1 CONTINGENCY DEFINITIONS Contingency A – Transferring open point(s) in the loop of the same feeder. This is the preferred way of managing planned and unplanned outages. Contingency B – Simple switching by transferring open point between...
AI summary Defines four contingencies (A-D) for managing power outages and switching procedures, detailing methods like transferring open points between feeders, backup feeder limitations, and cascade offloading scenarios.
1H-405 Feeder 1H-424 is a reliable backup for 1H-405.
AI summary Feeder 1H-424 is identified as a reliable backup for 1H-405, indicating redundancy in the power system infrastructure.
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.
(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.