Topic:"Distribution" in M11764

024 Page 51 of 67 2024 10-Year System Outlook Non-Confidential 1 The 138 kV transmission system is approximately 1,871 km in length and comprises 303 km of 2 steel structures and 1,568 km of wood pole lines. 3 4 The 69 kV transmission syst...

AI summary The document outlines the length and composition of Nova Scotia's 138 kV and 69 kV transmission systems, as well as its interconnections with New Brunswick and Newfoundland. It also describes the transmission design criteria used by NS Power to ensure system adequacy and security following faults.

ssociated prioritization of asset 19 replacement (i.e. conductor line, poles, cross-arms, guywires, and hardware replacement). 20 21 Transmission line inspections consist of the following actions: 22 • Visual inspection of every line once...

AI summary The text outlines the prioritization of asset replacement and the inspection procedures for transmission lines, including annual visual inspections, three-year foot patrols, and LiDAR surveys for non-BPS lines. BPS lines undergo LiDAR surveys every two years and foot patrols in the third year. These inspections help identify asset deficiencies and ensure proper line ratings.

s 13 determined by NS Power, NPCC/NERC Reliability Standards, or the NSUARB. Items described 14 below are current as of the date of this report. 15 16 8.1 Impact of Proposed Load Facilities 17 18 There were several system upgrades required...

AI summary The document outlines the impact of proposed load facilities on the power system, including the construction of new substations and the installation of transformers to accommodate increased load demands. These projects are expected to be completed in 2024 and 2025.

continues to advance 26 and replacement resources are identified, additional projects are anticipated to be identified. 27 28 2024 29 • 5P 25 MVA Mobile Substation Replacement (519754). DATE FILED: June 27, 2024 Page 63 of 67 2024 10-Year...

AI summary The document outlines the 2024 10-Year System Outlook, highlighting ongoing infrastructure projects such as the 5P 25 MVA Mobile Substation Replacement, and indicates that as replacement resources are identified, additional projects are anticipated.

Page 63 of 67 2024 10-Year System Outlook Non-Confidential 1 • Completion of 101W-Port Mersey Expansion in Q2 to include a new 138 kV-25 kV, 2 15/20/25 21 MVA transformer and two feeders (C0011261). 3 • 78W-Martins Brook substation relocat...

AI summary The document outlines a series of planned infrastructure projects for the Nova Scotia power grid from 2024 to 2026, including substation expansions, transformer replacements, and transmission line modifications to enhance system reliability and capacity.

ter) Substation 25 complete with two 25 kV distribution feeders. 26 • Replace 83V-Wolfville Ridge transformer 83V-T51 with a 138/69 kV-25 kV, 15/20/25 4 27 MVA transformer. DATE FILED: June 27, 2024 Page 64 of 67 2024 10-Year System Outloo...

AI summary The text outlines infrastructure upgrades, including the installation of a new substation with two 25 kV distribution feeders and the replacement of a transformer with a higher capacity unit. It also references the 2024 10-Year System Outlook document, which provides a non-confidential overview of the system's future.

7, 2024 Page 64 of 67 2024 10-Year System Outlook Non-Confidential 1 • Add a second 15/20/25 MVA 69 kV-12.5 kV transformer at 70W-High Street 2 (Bridgewater). Retire the 69 kV-4.16 kV transformer 70W-T51 and install a 2.5 MVA 12.5 3 kV-4.1...

AI summary The document outlines a series of infrastructure upgrades and replacements for the electrical grid in Nova Scotia from 2024 to 2034, including transformer replacements, substation installations, and future transmission planning as coal-fired generation is phased out and electrification advances.

its, ML, all hydro, biomass and PHP motors online. Wind is off to avoid counting the contribution of fault current from legacy wind as it does not support the grid during a system disturbance. Changing system load, different generation dis...

AI summary The document discusses the importance of monitoring System Short Circuit MVA (SCMVA) and Short Circuit Ratio (SCR) for grid reliability, particularly for sensitive facilities and existing wind plants. It outlines the need for future studies to ensure reliability is not compromised as the grid evolves.

load cases, a small reactor was added in the Sydney area to bring post-contingency voltage to the range required. This proved adequate to maintain post contingency voltage for many scenarios. Load growth will usually increase the need for...

AI summary The document discusses the addition of a small reactor in the Sydney area to maintain post-contingency voltage and the potential need for static and dynamic reactive power support as load growth increases. It also examines SCMVA for sensitive buses and the role of synchronous condensers in providing grid support, particularly in the context of a second 345kV tieline to New Brunswick.

rios (load dispatch conditions, generation online, etc.) are implemented in the PSS®E case and the corresponding network conditions transferred to the PSCADTM cases using python based scripts. The general EMT study procedure is quite simil...

AI summary The text discusses the use of PSS®E and PSCADTM for simulating electromagnetic transients (EMT) and RMS dynamic simulations in power systems. It outlines the procedure for identifying critical contingencies based on screening studies and highlights illustrative results showing voltage waveforms and unstable oscillations at points of interconnection (POI) involving inverter-based resources (IBR).

27 2024 10-Year System Outlook Report NSUARB IR-15 Attachment 1 Page 37 of 60 Frequency Control and System Strength Assessment requirements and model quality checks to ensure models not only perform well in simulation but are an accurate r...

AI summary The document discusses the need for detailed PSCADTM simulations to address stability, fault ride-through, and RoCoF concerns when integrating power electronic-based equipment. It emphasizes the importance of EMT simulations over RMS platforms to uncover design issues and avoid project delays.

time data needs may increase substantially and real time calculations for inertia and SCMVA at critical buses may need to be visible to Transmission Operations staff. • Distributed Energy Resources Increases in the total MW of DER and othe...

AI summary The document outlines potential challenges and recommendations related to system strength, distributed energy resources, protection and control, motor load customers, and transformation in the context of grid modernization and increasing renewable energy integration.