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Southwest Rhode Island Transmission Supply Study Long Term Needs and Solutions.

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Presentation on theme: "Southwest Rhode Island Transmission Supply Study Long Term Needs and Solutions."— Presentation transcript:

1 Southwest Rhode Island Transmission Supply Study Long Term Needs and Solutions

2 Southwest RI Transmission Supply Study Study initiated in 2001 due to recognition of voltage and thermal concerns. Identified Short-term and Long-term upgrades to ensure reliability of service. SWRI area supplied primarily by 115 kV lines looped between Kent County in RI and Montville in CT.

3 Geographic Location of Southwest RI New England Power Company Map redacted due to Critical Energy Infrastructure Information Available upon request

4 Southwest RI Area Reliability Concerns Voltage Concerns – Loss of G-185S – Voltages drop to unacceptable values of less than 0.9 p.u. and potential collapse Thermal Concerns – Loss of 1280 – G-185S overloads over STE rating for loss of 1280.

5 Existing Concerns New England Power Company Map redacted due to Critical Energy Infrastructure Information Available upon request

6 Short-term Upgrades Short Term upgrades addressed immediate voltage concerns – 7 distribution station capacitors – total of 38.7 MVars – In service for Summer 2003 Other Actions – Planned G-185S Uprate for Summer 2005

7 Recommended Solution New England Power Company Map redacted due to Critical Energy Infrastructure Information Available upon request

8 West Kingston Substation

9 Recommended Solution Extend L-190 from Davisville Tap to West Kingston substation (2007) – Total of 12.3 miles ACSR – Install load break switch at Davisville Tap – Total $6.0M Connect L-190 at West Kingston substation (2007) – Install new 115 kV bus structure – Install 2 nd Breaker and two disconnect switches – Reterminate T2 transformer to L-190 for better load management – Replace existing breaker and disconnect switches at West Kingston substation – Install motor operated air break switch on L-190 within substation fence. – Replace air break switch on G-185S with a motor operated air break switch within substation fence – Total $2.6M

10 Recommended Solution (contd) Reconductor L-190 from Kent County to Davisville Tap (2007) – 2 miles of 795 AAC on single circuit towers reconductored to 1590 ACSR (2007) – 3.26 miles of 795 ACSR on DCT reconductored to 1113 ACSR (2007) – Total $1.9M Future Upgrade: Reconductor G-185S from Kent County to Davisville Tap by 2012 – 2 miles of 795 ACSR on single circuit towers reconductored to 1590 ACSR – 3.26 miles on DCT reconductored to 1113 ACSR – Total $2.0M Total $14.6M – TCA Application $10.5M – Short Term Completed Non-PTF $ 2.1M – Future Work $ 2.0M

11 Other Alternatives Studied Alternative 2 – 115 kV Capacitors (6x10 MVAr) – Reconductor G-185S from Davisville Tap to West Kingston to 795 ACSR (2006) – Reconductor G-185S from Kent County to Davisville Tap with 1113 ACSR and 1590 ACSR (2008) – Additional Reinforcement Reqd by 2016 – Estimated Total $15.7M Alternative 3 – FACTS Devices (60 MVAr) – Reconductor G-185S from Davisville Tap to West Kingston to 795 ACSR (2006) – Reconductor G-185S from Kent County to Davisville Tap with 1113 ACSR and 1590 ACSR (2008) – Additional Reinforcement Reqd by 2016 – Total $19.9M

12 Other Alternatives Studied (contd) Alternative 4 – 345 kV line Kent County to Montville – Total $108.1M

13 Assessment of Alternatives Recommended L190 Alternative : – Technically Superior to Alternatives 2 and 3 – Economically preferred – least cost – Future Expansion – in-line with long term plans to continue 2 nd 115 kV tie into Connecticut. – Potential operational impacts during construction – less impact than Alternatives 2 and 3. – West Kingston substation will contain new standard equipment for additional breaker and replacement of existing breaker and switches. Alternatives 2 and 3 – Switching voltage variations are an issue on weak system Alternative 4 – Cost excessive for local needs – Longer construction time

14 Upcoming Applications New England Power Company Map redacted due to Critical Energy Infrastructure Information Available upon request


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