PJM Generator Interconnection Request. Queue #F04 Somerset 115 kv 30 MW. Queue #I04 Somerset-Allegheny (Pride/Stonycreek) 115 kv 45 MW (Energy Only)

Transcription

1 PJM Generator Interconnection Request Queue #F04 Somerset 115 kv 30 MW Queue #I04 Somerset-Allegheny (Pride/Stonycreek) 115 kv 45 MW (Energy Only) Facilities Study Report December 2004 #295423

2 SCOPE Description of Project: Keystone Wind Power L.L.C. has proposed installation of a 30MW wind powered generating facility to be installed in Brothers Valley and Somerset Townships, Somerset County, Pennsylvania (Queue position F04). The generating facility will consist of induction generator wind turbines each with a generating capacity of KW. The plant is proposed to be in service December 31, Stonycreek WindPower, LLC has proposed a 45 MW wind turbine generating station consisting of forty wind turbine generators (Queue position I04). The plant will be utilizing the Vestas 1.8MW machines. The generating station is to be located in Stonycreek and Somerset Townships, Somerset County Pennsylvania. The generating plant, originally scheduled to be in service March 31, 2003, is now scheduled to be in service September 30, The interconnection of both projects will be at 34.5 kv to a new kv substation (Pride a.k.a. Stonycreek) being designed and constructed by the Somerset REC under the delivery point agreement with FirstEnergy (FE). Under that agreement, FE will take ownership of the 115 kv portion of the substation that conveys power across the transmission system. FE will design and install the transmission line tap to the new substation and modify the protective relaying at the Allegheny and Somerset Substations. The Pride Substation Project (The Facility -- also called Stonycreek Substation) is a new delivery point for the Somerset Rural Electric Cooperative, which replaces and eliminates the existing Somerset White Horse Delivery Point. The new substation will serve Somerset s consumers and provide direct connection for two- (2) new wind turbine generating facilities. The two new generators, Keystone WindPower L.L.C. proposes a new 30 MW facility and Stonycreek WindPower L.L.C. a new 45 MW facility. Somerset proposes to tap Pennsylvania Electric Company s (Penelec s) 115 kv transmission line between Penelec Somerset Substation and Penelec Allegheny Substation approximately two miles east of the Penelec Somerset Substation. The substation site is located approximately three miles east of Somerset, Pennsylvania on the north side of State route 31. It is directly across route 31 from the Waste Management landfill site. The Keystone WindPower LLC, under PJM Generator Interconnection Request Queue #F04, and the Stonycreek WindPower LLC, under PJM Generator Interconnection Request Queue #I04, wind turbines will be connected to the transmission system via the low voltage side of the 115/34.5 kv transformers to be installed at the Pride Substation. Somerset REC s consumers will be connected to the transmission system via a 12.5 MVA, 24.9/34.5 kv transformer (and one spare) connected to the low voltage side of the 115/34.5 kv transformers. The new wind farms consisting of 45 MW and 30 MW will have a total connected capacity of 75 MW. Ammendments to System Impact Study None.

3 Substation Interconnection Milestone Schedule: Substation in-service: 18 months after execution of the Interconnection Agreement Initial operation (first synchronization): 18 months after execution of the Interconnection Agreement Commercial operation date: 18 1/2 months after execution of the Interconnection Agreement These estimates of time for construction appear to have been shortened. Apparently the substation can be constructed by the fall of Stoneycreek Windpower (I04) Milestone Schedule July 1, 2005 Initial project energization September 30, 2005 Commercial operation date Keystone Wind Power (F04) Milestone Schedule Close Financing April 2005 Purchase of major equipment April/May 2005 Start of Construction May 2005 First Energization October 2005 Project Completion December 2005 Facility Study Result Work to be completed by Somerset REC Pride (Stonycreek) 115/34.5 kv Substation: The substation portion of work is to be completed by Somerset REC in accordance with RUS guidelines, the one-line diagrams, and the site plan. The following description, ratings and design criteria shall be used to build the substation. Description: The substation shall be construction as a double-end transformer substation consisting of 115 kv line breakers with provisions for a third 115 kv breaker tie position, 115 kv power transformers, 115 kv fault interrupters, 115 kv metering instrument transformers, and 115 kv power line carrier and relaying potential transformers. The Penelec Somerset Substation to Penelec Allegheny Substation 115 kv transmission line will be looped into and out of the substation by FirstEnergy. The 115 kv breaker positions shall be equipped with breaker disconnect and bypass switches. The substation shall be constructed utilizing galvanized structural steel. Installation of 115 kv fault interrupters and 34.5 kv transformer bus breakers shall provide a means of isolating the power transformers for emergencies, operation and maintenance activities.

4 All sources of generation will be connected to the 34.5 kv buses with circuit breakers. A 34.5 kv bus-tie breaker shall be installed. Somerset REC will take delivery from 34.5 kv Bus #2. A relay control house shall be provided to house the relay switchboards, SCADA RTUs, ac and dc panelboards, communications equipment, and 125 Vdc battery system. Ratings/Design Criteria: GSU Power Transformers: three phase units, 115 to 34.5 kv, rated 40/53/66//74 65 degrees C with LTC in 115 kv windings. 115 kv is 550 kv kv is 200 kv. Quantity: 2 Distribution Power Transformers: three phase units, 34.5 kv to 24.9 kv, rated 10/ degrees C kv is 200 kv BIL kv is 150 kv. Quantity: 2 (one spare) Capacitor banks: 34.5 kv, rating/type to be determined. Quantity: 2 Circuit breakers: 115 kv, 2000 A, 550 kv BIL, 40 ka interrupting, SF6 insulated, 4 sets of current transformers (two sets per bushing), Quantity: 2 (structure and switches provided for future 3 rd breaker) Circuit breakers: 34.5 kv, 2000 A, 200 kv BIL, 20 ka interrupting, Vacuum, Quantity: 3 (two bus breakers and one tie breaker) Circuit breakers: 34.5 kv, 1200 A, 200 kv BIL, 20 ka interrupting, Vacuum, Quantity: 6 Fault interrupters: 115 kv, 1200 A 550 kv BIL, 25 ka, Quantity: 2 Group disconnect switch: 115 kv, 1200 A, 550 BIL, 43.5 ka (3 sec), manually operated Group disconnect switch: 34.5 kv, 2000 A, 200 BIL, 100 ka, manually operated Group disconnect switch: 25 kv, 1200 A, 150 BIL, 61 ka, manually operated Disconnect switch: 34.5 kv, 2000 A, 200 BIL, 43.5 ka (3 sec), manually operated Disconnect switch: 34.5 kv, 1200 A, 200 BIL, 38 ka (3 sec), manually operated Disconnect switch: 25 kv, 1200 A, 150 BIL, 38 ka (3 sec), manually operated Regulator bypass: 25 kv, 1200 A, 150 kv BIL, 61 ka (mom.), manually operated Tandem disconnect switch: 25 kv, 1200 A, 150 BIL, 38 ka (3 sec), manually operated Reclosers: 34.5 kv, 560 A, 200 kv BIL, Quantity: 2 Recloser: 25 kv, 560 A, 150 kv BIL, Quantity: 2 Regulator: 333 kva, 25 kv, 150 kv BIL, Quantity: 3

5 CCVT: 115 kv, 550 kv BIL, Quantity: 2 Line trap: 2000 A, Quantity: 2 Protection Requirements: The attached one line diagrams provide details of the relay requirements for the Pride substation. The 115 kv high side of the substation will contain, at minimum, two 115kV circuit breakers, two 115 kv fault interrupters, two 115kV-34.5kV (wye grounded delta wye grounded) transformers, and 115 kv metering instrument transformers. Each 115 kv line exit shall be equipped with a line trap, capacitor voltage transformer, line tuner and carrier set. Minimum protective relaying requirements for this substation installation include primary and backup relays plus a breaker failure relay and an intertie relay. The 115kV breakers shall be purchased with four sets (12 total) of 2000:5 A MR C800 CTs. The 115 kv circuit breaker primary line relays shall be an SEL-321 and SEL-311B for directional ground and phase distance protection. SEL-352 breaker failure relays shall be utilized on the 115kV circuit breakers. The source for the breaker failure fault detector and line relays shall be CTs on the bus side of the 115kV circuit breakers. Any protective trip of this breaker shall initiate the failure to trip scheme. The intertie relay shall be an SEL-351, including 27, 59, 81, 67V and 67N elements. The source for the intertie relay shall be CTs on the 115 kv side of the kv transformers. The CT inputs shall be paralleled from both transformers. The transformer primary protective relay shall be an SEL-587. The transformer backup protective relay shall be an SEL-551 (backup, non-directional) or SEL-351 (backup, directional) digital relays for the transformer high side and the 51G function for the transformer low side. (Note: Directional relays used if required for relay coordination). The transformer primary and backup relaying trips through independent lockout relays. 115 kv bus protection shall be provided by two SEL-387 relays for redundant 115 kv bus protection with inputs from the line side of the two line breakers and the high side of each transformer. These relays shall trip both of the 115 kv line breakers and the 115 kv transformer fault interrupters and 34.5 kv bus circuit breakers kv bus protection shall be provided by two SEL-387 relays with inputs from the source side of the 34.5 kv bus breaker, from the 34.5 kv bus tie breaker, and from the rest of the 34.5 kv circuit breakers connected to that 34.5 kv bus. Each of these relays shall trip its associated 34.5 kv bus and 34.5 kv bus-tie breaker and all other bus-connected 34.5 kv breakers. All required relays shall be utility grade devices. The relaying system shall have a 125 Vdc battery system. Direct Transfer Trip Equipment:

6 Direct Transfer Trip over Class A leased telephone lines from both Somerset and Allegheny substations is to be acquired and maintained for Direct Transfer Trip communications. Receipt of DTT from FirstEnergy shall trip all generation connected to Pride substation. Loss of the DTT channel shall also trip generation connected to Pride substation. Special Relay Requirement: Since stability problems occur as a result of the loss of the Pride Somerset 115kV line for fault clearing, it is, therefore, recommended that the I04 project generators shall be tripped without intentional time delay whenever the Pride Somerset 115kV line becomes unavailable, and should not be reconnected to the 115 kv system till the line is back in service. Metering Requirements: Revenue metering is to be measured by 115 kv instrument transformers installed on the high voltage side of the kv transformers located within 115 kv bus differential zone between the 115 kv fault interrupters and 115/34.5 kv transformers. Metering shall also be provided between each of the 34.5 kv breaker and the 34.5 kv interconnection lines for the generation feeders and between the 34.5 kv breaker and REC s 34.5/24.9 kv transformers. SCADA Requirements: Monitoring should be provided via a SCADA RTU for the 34.5 kv breakers on the generation feeders. Pride (Stonycreek) 115/34.5 kv Substation cost estimate: The estimated cost of the substation is $2.52 million. Work to be done by FirstEnergy Design Criteria Facilities owned and operated by FirstEnergy shall comply with the FirstEnergy Requirements for Transmission Connected Facilities. The FE 115 kv system design shall be based upon the following criteria: General Design Requirements System frequency: 60 hertz Elevation, AMSL: 2254 feet Isokeraunic level: 40 Maximum ambient temperature: 40 degrees C Minimum ambient temperature: -40 degrees C Maximum conductor operating temperature: 100 degrees C Wind Loading (round shapes): 25 psf Ice loading Substations (no wind): 1 inch

7 Seismic zone: Per ASCE 7-98, per Fig (a) and (b). Equipment qualification per IEEE Voltage and Current Ratings Nominal phase-to-phase: 115 kv Maximum phase-to-phase: 121 kv Basic impulse level (BIL): 550 kv Maximum continuous current carrying capacity: 2000 A Design fault current: 40 ka Maximum fault clearing time: 15 cycles Clearances and Spacing Recommended rigid bus center-to-center phase spacing: 84 Minimum phase-to-phase, metal-to-metal distance: 53 Recommended phase-to-ground: 45 Minimum phase-to-ground: 42 Minimum vertical clearance from live parts to grade: 11-7 Minimum horizontal clearance from live parts: 6-1 Minimum conductor clearance above roads in switchyard: 20-2 Minimum bottom of insulator to top of foundation: 8-6 Transmission Lines New/Upgraded 1. Allegheny Somerset 115 kv Line Design, furnish and install a loop (in/out) tap to the new Pride (a.k.a. Stonycreek) Substation. The estimate assumes the substation will be located at the base of an existing transmission line structure. The estimated cost for this work is $70,000 and could be completed in 8 months (6 months for engineering and permitting, 3 months for material and 2 months for construction). Permitting may be required with the PaPUC. Substations New/Upgraded 1. Pride (a.k.a. Stonycreek) Substation. Provide design review and interconnection coordination (transmission line, interconnection metering and SCADA) of the Somerset REC designed and constructed substation. Provide design review and interconnection coordination (interconnection metering and SCADA) for the FE required telemetry of the wind turbine 34.5 kv connections at the Somerset REC substation. The costs of the activities associated with the FE-REC delivery point are assumed to be outside the scope of the PJM interconnection. The estimated cost for the FirstEnergy activities

8 associated with the wind turbine interconnection is $13,000 and would be completed to support the REC s schedule. 2. Allegheny Substation Design, furnish and install the following additions and modifications at the Allegheny 115 kv Substation: New control and relaying on the present Somerset 115 kv line associated with the addition of the new Pride (a.k.a. Stonycreek) Substation. The existing Somerset 115kV exit shall become the new Pride 115kV exit. New line relaying and carrier equipment is required for this exit. A new wave trap and tuning equipment is also required. The existing circuit breaker and line CCPD shall be used. A Direct Transfer Trip (DTT) transmitter is to be installed and DTT is to be keyed to Pride substation for any protective trip of the Pride exit at Allegheny, for a breaker open condition or for a BFT operation on the Allegheny 115kV bus. The estimated cost for this work is $180,000 and could be completed in 8 months (6 months for engineering, 3 months for material and 2 months for construction). There should be no permitting requirements.

9 3. Somerset Substation Design, furnish and install the following additions and modifications at the Allegheny 115 kv Substation: New control and relaying on the present Somerset 115 kv line associated with the addition of the new Pride (a.k.a. Stonycreek) Substation. The existing Allegheny 115kV exit shall become the new Pride 115kV exit. New line relaying and carrier equipment is required for this exit. The existing circuit breaker and line CCPD shall be used. A Direct Transfer Trip (DTT) transmitter is to be installed and DTT is to be keyed to Pride substation for any protective trip of the Pride exit at Somerset, for a breaker open condition or for a BFT operation on the Somerset #1 115kV bus. The estimated cost for this work is $155,000 and could be completed in 8 months (6 months for engineering, 3months for material and 2 months for construction). There should be no permitting requirements. Summary Results of the Study FE can meet the Somerset REC schedule of in-service 18 months after a CSA is signed. A cost summary in 2004 dollars and excluding taxes or CIAC is: 115 kv Transmission Line Tap $70,000 Allegheny Substation Modifications $180,000 Somerset Substation Modifications $155,000 Wind Turbine Interconnection Activity $13,000 Total $418,000 A proposed milestone schedule for this work based upon months from a signed CSA is: Qualifiers Activity Start Month End Month Detailed Engineering 0 6 Equipment Procurement Delivery 3 5 Construction 7 8 Testing & Commissioning 8 8 The accomplishment of the work on the FirstEnergy system to support the costs and schedule is dependent on the following:

10 The developer/somerset REC providing dedicated communication circuits for direct transfer trip relaying from FE s Allegheny and Somerset Substations, for SCADA communication to the transmission system control center, and for dialup access to revenue metering. Obtaining approval from PJM for the necessary outages. No equipment delivery, environmental or regulatory delays. No contractor problems. No force majeure. Interconnection Service Agreement Information The following table summarizes the total costs according to FERC criteria. The costs are in 2004 dollars and do not include taxes or CIAC. Network Facilities Direct Charges Labor $76,900 Direct Charges Material $153,000 Indirect Charges Labor $113,000 Indirect Charges Material $30,300 Return (12%) $44,800 Total $418,000

11 ATTACHMENTS Somerset REC Pride Substation One-Line and Protective Relay Diagram

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