Topic:"Distribution" in M12744

Capital Project Detailed Estimate Location: Distrubution C0080102 CI# : Title: 92H-331 Double Circuit Peggy's Cove Rd

AI summary The document presents a capital project detailed estimate for the 92H-331 Double Circuit Peggy's Cove Rd located in Distribution. The document includes a CI# and a title for the project.

oils & Hydrology Not Applicable (NA) NR Technical Deliverables (Specifications and/or Drawings) Conductor, Insulator, Grounding, Joint Design (including protection for buried or subsea) Complete (C) S P C C C Foundation/Structure (Tower) D...

AI summary The document outlines technical deliverables and project milestones for an infrastructure project, including specifications, designs, and construction permits. It provides status updates on various components such as conductor, insulator, and foundation design, as well as route mapping and surveying.

TABLE OF CONTENTS EXECUTIVE SUMMARY TABLE OF CONTENTS i LIST OF APPENDICES ii LIST OF TABLES AND FIGURES ii 1.0 SCOPE 1 2.0 Existing System 2 2.1 Transmission 2 2.2 Distribution Ξ 2.2.1 92H-Tidewater ε 2.2.2 137H-Hammonds Plains Distributi...

AI summary The document outlines the existing electrical system in Nova Scotia, focusing on transmission and distribution infrastructure, load history, reliability concerns, and potential capacity alternatives. It details issues such as transformer overloads, voltage problems, and aging equipment in specific areas like Tidewater and Hammonds Plains, and presents various solutions to address these challenges.

Figure 1: Tidewater and Hammonds Plains Area Transmission System Table 1: Tidewater and Hammonds Plains Area Line Ratings Line Number Location Length (km) Conductor Summer (MVA) Winter (MVA) L-6002a 90H-Sackville to 87W- Hubbards 49.9 ACSR...

AI summary Figure 1 and Table 1 describe the Tidewater and Hammonds Plains Area Transmission System, detailing line numbers, locations, lengths, conductor types, and summer and winter line ratings in MVA for various transmission lines.

The distribution systems under study are 92H-Tidewater and 137H-Hammonds Plains. Appendix A contains copies of the 92H & 137H substation one-line diagrams. [Table 2](#page-13-2) provides winter peak loading for the 92H & 137H substation tr...

AI summary The text discusses the distribution systems 92H-Tidewater and 137H-Hammonds Plains, referencing tables that provide winter peak loading data and transformer specifications for these substations.

Substation Transformer Feeders Winter Peak 92H-Tidewater 92H-T61 331, 332, 334 20.5MVA 137H-T61-Hammonds Plains 137H-T61 411, 412, 413, 414 50.6MVA Table 3: Tidewater and Hammonds Plains Area Feeder loading Feeder Typical Winter Peak Trans...

AI summary The text provides technical details about substations, transformers, feeders, and winter peak loads in the Tidewater and Hammonds Plains areas. It includes tables with specifications for transformers and feeder loading data.

The 92H-Tidewater substation is supplied by a single 138–13.2 kV transformer, 92H-T61, rated 7.5/10/12.5 MVA. The transformer supplies three 12.47 kV distribution feeders serving areas surrounding Hubley, Peggy's Cove and Boutilier's Point...

AI summary The 92H-Tidewater substation is supplied by a single transformer that is capacity constrained during winter peak conditions. The substation serves multiple areas and includes embedded hydroelectric generation, but these facilities cannot fully offset the load during peak times. Feeder 92H-331 exceeded its design capacity during the winter peak, and there are no options to transfer the load.

Table 5: Tidewater Area Feeders Feeders Description 92H-331 Supplies customers along Peggy's Cove Road to East Dover. The single-phase extent of this feeder abuts single-phase 25 kV distribution from 103H-Lakeside. 92H-332 Supplies custome...

AI summary The text describes three feeders in the Tidewater Area, detailing their locations and connections to other distribution systems. It also introduces a section about the 137H-Hammonds Plains Distribution System.

The 137H–Hammonds Plains substation is supplied by a single 138-25 kV transformer, 137H-T61, rated 25/33/42 MVA. The transformer supplies four 25 kV distribution feeders serving Hammonds Plains and surrounding areas. The winter peak load o...

AI summary The 137H–Hammonds Plains substation is supplied by a single transformer and faces capacity issues during winter peak loads. The current contingency capacity is below the winter peak load, and three feeders exceed planning criteria. Load growth from residential development and electrification is expected to increase demand further.

Table 6: Hammonds Plains Area Feeders Feeders Description 137H-411 Supplies customers in Kingswood, Glen Arbour, and Pockwock Rd. into Upper Hammonds Plains. Ties with 137H-412 at the midpoint of feeder near downline recloser. 137H-412 Sup...

AI summary The document presents a table detailing the Hammonds Plains Area Feeders, including their descriptions and connections, followed by a section on load history and forecast.

6.2.1 Alternative A: New Stillwater Lake Substation Stillwater Lake was identified as the preferred location for a potential new substation for several reasons. Appropriate land is available for sale near a 138 kV transmission line and Ham...

AI summary Alternative A proposes the construction of a new substation at Stillwater Lake to improve reliability and efficiency by leveraging existing distribution lines and reconfiguring feeders. This option also includes the installation of a second transformer at Hammonds Plains in 2037.

6.2.2 Alternative B: Additional Transformer at Hammonds Plains Another option for adding new capacity in the Hammonds Plains area is adding a transformer at the 137H-Hammonds Plains substation. This station was built for a second transform...

AI summary Alternative B involves installing an additional transformer at the 137H-Hammonds Plains substation to add new capacity. While the transformer installation is relatively simple, significant feeder development and reconfiguration are required. This alternative poses risks to budget and schedule due to challenges in obtaining easements and constructing along a congested road.

6.3.1 Alternative A: Hubley Conversion and Transfer to Stillwater Lake The Hubley area has experienced significant load growth, and the feeder 92H-332 has previously been identified as overloaded. To address this, distribution supplied fro...

AI summary Alternative A involves converting Hubley's 12 kV system to 25 kV and transferring it to Stillwater Lake to address load growth and overloading. A new substation at Stillwater Lake will provide a new 25 kV source, and temporary supply from feeder 103H-432 will be used during the transition. The plan includes installing transformers, extending feeders, and rebuilding the Tidewater substation.

Rather than converting the Hubley area to 25 kV, it is possible to expand the Tidewater substation and add an additional 12 kV feeder. There is no space for expansion at the current substation site, so a new station would need to be built...

AI summary The text outlines an alternative approach to upgrading the electrical infrastructure in the Hubley area by building a new Tidewater substation, reconfiguring feeders, and relocating existing transformers, rather than converting the area to 25 kV. This involves constructing a new substation, upgrading protection systems, and modifying feeder configurations to address capacity issues.

NON-CONFIDENTIAL 1 Request IR-1: 1 distinct planning recommendation, and the need for the feeder project remains unchanged 2 regardless of whether or when the transformer replacement proceeds. 1 Request IR-2: 2 3 Please describe the expect...

AI summary The document discusses the need for a feeder project to improve system reliability and resiliency by offloading feeder 92H-331, which currently exceeds load limits and has no available load transfer options. The project is expected to reduce the risk rating of the feeder and improve restoration times during outages.

If required, additional incremental capacity could be achieved through an interconnection with 92H‑332 contingent upon completion of a portion of the proposed double‑circuit construction along Peggy's Cove Road to Nautical Way. This partia...

AI summary NS Power is considering partial construction of a double-circuit line along Peggy's Cove Road to Nautical Way as a contingency measure to reduce feeder overload ahead of the next cold-load season. This option depends on early work orders being approved and ready for construction by May/June 2026. Engineering and planning activities are ongoing to secure third-party consents and prepare the worksite.

NON-CONFIDENTIAL 1 Request IR-7: 2 3 Assuming the Board approves C0071888 92H-T61 Transformer Replacement: 4 5 (a) Please explain the necessity of the Stillwater Lake Substation for the proposed CI 6 C0080102 92H-331 Double Circuit Peggy's...

AI summary The response to Request IR-7 explains that the Stillwater Lake Substation is not required for the immediate transformer replacement or new feeder on Peggy's Cove Road but is necessary for a long-term solution in the Tidewater/Hubley area. It also discusses the possibility of transferring load from other feeders to 92H substation.

NON-CONFIDENTIAL 1 Request IR-9: 2 3 Please confirm whether the proposed double circuit/circuit extension is 92H-335. 4 5 Response IR-9: 6 7 Confirmed. 1 Request IR-10: 2 3 In Attachment 1 (M-AREA-2025-002), Section 3.1, NS Power noted tha...

AI summary The document contains a request and response related to a proposed double circuit/circuit extension (92H-335) and a detailed inquiry regarding NS Power's handling of an overloaded feeder (92H-331), including questions about delayed project proposals, mitigation of overload conditions, and technical documentation on operating procedures.

NON-CONFIDENTIAL 1 Request IR-11: 1 Request IR-12: 2 3 (a) Most 92H feeders are adjacent to 25 kV feeders supplied from the 137H and 103H 4 substations. Please explain why under Alternative A, NS Power proposes to convert 5 only a portion...

AI summary The document contains a series of requests (IR-11 through IR-12) related to the technical and financial aspects of converting electrical feeders and transformers to 25 kV. The requests focus on feasibility, costs, and specific technical details for various infrastructure changes, with a response beginning for IR-12.