INTERCONNECTION FACILITIES RE-STUDY FINAL REPORT · 9/30/2010 · TI-04-1214 Final Fac Re-Study...

Interconnection Facilities Re-Study Report IR No. TI-04-1214 Final - September 30, 2010

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Interconnection Request No. TI-04-1214

INTERCONNECTION FACILITIES RE-STUDY

FINAL REPORT

Prepared by Scott Fernau and Reviewed by Ray La Panse Tri-State Generation and Transmission Association, Inc.

September 30, 2010



DISCLAIMER OF WARRANTIES AND LIMITATION OF LIABILITIES THIS DOCUMENT WAS PREPARED FOR TRI-STATE GENERATION AND TRANSMISSION ASSOCIATION, INC. (TSGT) IN RESPONSE TO A TRANSMISSION SYSTEM INTERCONNECTION REQUEST. NEITHER TSGT, NOR ANY PERSON ACTING ON BEHALF OF TSGT: (A) MAKES ANY REPRESENTATION OR WARRANTY EXPRESS OR IMPLIED, WITH RESPECT TO THE USE OF ANY INFORMATION, METHOD, PROCESS, CONCLUSION, OR RESULT DISCLOSED IN THIS DOCUMENT, INCLUDING FITNESS FOR A PARTICULAR PURPOSE; OR (B) ASSUMES RESPONSIBILITY FOR ANY DAMAGES OR OTHER LIABILITY WHATSOEVER, INCLUDING ANY CONSEQUENTIAL DAMAGES, RESULTING FROM USE OF THIS DOCUMENT OR ANY INFORMATION CONTAINED THEREIN.



CONTENTS

1. INTRODUCTION 1.1. Objective 1.2. Background 1.3. Scope

2. INTERCONNECTION OF WIND GENERATING FACILITY 2.1. General Discussion 2.2. Interconnection Substation Description

3. GENERATING FACILITY PERORMANCE VERIFICATION 4. SCHEDULE 5. REFERENCES 6. LIST OF ATTACHMENTS



1. INTRODUCTION

1.1 Objective This report presents the Interconnection Facilities Re-Study (Facilities Study) results for interconnection of a proposed Interconnection Customer’s (IC) 88MW wind generating facility (the Project) to the Transmission Provider’s (Tri-State Generation and Transmission Association’s “Tri-State”) 115kV transmission system in northeast New Mexico. The objective of this Facilities Study is to provide (+/-20% accuracy) estimates of the design / procurement / construction / testing of the Transmission Provider’s Interconnection Facilities, and Network Upgrades as have been identified in the Interconnection System Impact Re-Study (SIS) report dated May 28, 2010.

1.2 Background

The Project has selected a location of interconnection approximately midpoint in the Tri-State 115kV Bravo Dome–Clapham Transmission Line at a new yet unnamed Transmission Providers Interconnection Facility that for purposes of reference will be called Transmission Provider Substation. Transmission Provider Substation will be arranged in a single-breaker tap configuration so that faults within the generating facility are contained within the Project and not adversely impact operation of Tri-State’s 115kV line. A second, IC owned and operated main transformer 115kV fault interrupting device will be required to be installed for protection of the IC’s transformer; this cost is an IC cost and is outside the scope of this report. This substation is in an area of potential transmission system expansion and at some time in the future could be required to interconnect to a looped transmission line. To accommodate this potential expansion without taking outages on the Transmission Provider Substation additional 115kV disconnect switches will be installed as a part of the initial construction. For this particular interconnection, the IC has the option to build Transmission Provider Substation, utilizing Tri-State’s design standards, acceptable equipment manufacturers, testing requirements, etc. so costs related to Transmission Provider Substation will be only for costs associated with equipment installed and work performed by Tri-State, plus costs associated with Tri-State’s review of the design, construction, and commissioning activities associated with the Transmission Provider Substation. Once completed and accepted by Tri-State, the Transmission Providers portion of the Transmission Provider Substation will be owned and operated by Tri-State. An additional 115kV breaker on the Transmission Provider Substation, Bravo Dome line termination could be added to provide line sectionalization capabilities. This would allow 115kV faults between Transmission Provider Substation and Bravo Dome Substation to be cleared without impacting the Project. Without this additional protection, faults on the line between Transmission Provider Substation and Bravo Dome Substation will be cleared by the 115kV line termination breaker at Clapham Substation, taking the Project off line. The IC has been informed of this beneficial addition but has elected not to install the needed equipment. Therefore the cost for the additional line breaker and associated equipment has not been included in this report.



A Final System Impact Re-Study (SIS) report for this project dated May 28, 2010 has been issued and posted on Tri-State’s OASIS web site. The study was conducted in accordance with Tri-State’s Large Generator Interconnection Procedures (LGIP) and entails steady state power flow, dynamic stability, short circuit analysis and preliminary cost and schedule estimates for interconnection of the Project. The SIS report outlines several Network Upgrades that need to be performed, these include: upgrades of the substation line termination equipment for the Gladstone-Springer 115kV line; microwave communications equipment installation from Clapham to the Transmission Provider Substation; 115kV transmission line work to tap Transmission Provider Substation into the existing Clapham-Bravo Dome 115kV line; relaying upgrades at Clapham Substation; install revenue metering at Bravo Dome Substation; and review of the IC design and construction activities and commissioning associated with Transmission Provider Substation.

1.3 Scope This Interconnection Facilities Re-Study Report includes details of the configuration for the construction of the 115kV Transmission Provider Substation and Network Upgrades that are required for this project. Documents to summarize the construction work required include: electrical one-line diagram, cost estimates (that include major material lists), and project schedule. .

2. INTERCONNECTION OF THE WIND GENERATING FACILITY

2.1 General Discussion Transmission Provider Substation will tie into an 115kV radial transmission line that serves large industrial customer load. The nature of this line and the Transmission Provider customer served load does not allow for any outages of the line to connect Transmission Provider Substation. Depending on the substation design, its location and configuration of the existing line, a temporary line may need to be built around the construction area to facilitate the intertie of the new substation. A worst case cost has been included in the estimates provided with this report. The configuration of Transmission Provider Substation has been previously discussed with the IC (and is also discussed below), where the bulk of the cost to design, procure and construct the substation will be paid for and performed by the IC. Communications to Transmission Provider Substation by Tri-State will be by microwave link from Transmission Provider Substation to a point where there is network access. Work of particular interest to Tri-State and not performed by the IC but will be IC financial responsibility includes: design, installation and testing of the SCADA RTU, revenue metering and telecommunications system. Tri-State will also be reviewing and approving the design, material and construction drawings for Transmission Provider Substation and will have on-site construction inspection. The proposed Transmission Provider Substation includes 115kV Point of Interconnection (POI) bi-directional metering, 115kV line protective relaying and communication assisted cross-tripping from Clapham Substation, 115kV bus differential protection, SCADA system and control building. Primary protection (relaying and the interrupting device) for the IC’s



main substation step-up transformer will be provided by the IC in its substation yard. Equipment in the Transmission Provider’s substation yard will only provide backup protection for the transformer protection in the event of equipment failure or malfunction in the IC’s facility. To facilitate protective relaying and data acquisition, conduit will be installed between Transmission Provider’s and the IC Substations to contain as a minimum, CT circuits; fiber optic cables; and circuits for protective tripping.

This Project will cause higher current flows in the regional transmission system causing the need for several Network Upgrades, outside of the new Transmission Provider Substation. These are outlined below with details to follow: • Revenue metering for the Bravo Dome Substation is currently located at Clapham

Substation. With the Project being interconnected into the Bravo Dome-Clapham 115kV transmission line, the revenue metering will need to be moved to Bravo Dome Substation. Along with the metering installation will be communications equipment and RTU.

• At Clapham Substation the existing revenue metering will need to be removed; power quality metering installed to monitor system performance before and after the Project is commissioned; relay settings will need to be modified; and transfer trip (cross trip) will be added to trip the Project off line for a trip at Clapham.

• At Gladstone Substation relay settings will need to be modified. • At Springer Substation, to accommodate the increased line flow, metering CT’s will

need to be replaced to accommodate the increased line flow, and to bring the line’s present terminal equipment limited 120 MVA (600A) rating up to the line conductor capacity 169 MVA (848A) rating, an existing wave trap (that is no longer in use) will need to be removed, relay settings will be modified and SCADA scaling factors will be updated.

2.2 Transmission Provider Substation Description

The layout of the proposed Transmission Provider Substation is depicted on the One-Line Diagram (Fig. 1).

2.2.1 Work to be completed and paid for by the Interconnection Customer

• Engineer, purchase, construct and own equipment associated with the generating plant and all Interconnection Facilities up to the Point of Ownership Change (POC), as indicated on the attached one-line diagram, including: installing an interrupting device, associated isolation switch and relaying for transformer protection.

• Land costs, access roads and any costs associated with obtaining state or local permits for the Project.

• Provide access to analog, indicating, control and data circuits, as required to integrate into the design and operation of the Tri-State control system.

• Engineer, purchase and construct facilities associated with Transmission Providers Interconnection Facilities from the POC to the Point of Interconnection (POI), including but not limited to (where applicable):



o Intertie substation ground grids, substation fencing, duct bank/conduit between the substations, substation grading plans and the 115kV intertie.

o Install one 115kV manually operated disconnect switch o Install three 115kV potential transformers and three 115kV current transformers

for bi-directional metering. o Associated structures, bus work, jumpers, and grounding

2.2.2 Network Upgrade work to be completed and paid for by Interconnection Customer

(with costs being refundable as identified in the GIP / GIA): • Engineer, purchase and construct Transmission Provider Substation in its entirety

with the exception of the work outlined in Section 2.2.3 that will be done by Transmission Provider. Design, material and construction to be completed in conformance with TP’s applicable standards, and reviewed and approved by Transmission Provider.

• Install six 115kV manually operated circuit breaker isolation switches. • Install two 115kV motor operated line disconnect switches, one with load break

capability. • Install one 115kV circuit breaker. • Install three 115kV metering unit CT/VT instrument transformers and associated

115kV disconnect switch, for POI metering, and 115kV line protection relaying, etc.

• Install one 115kV power potential transformer for primary station service and sync check.

• Install power control assembly with space for equipment controls, line and bus differential relaying, line and revenue metering, battery and DC system, AC system, telecommunications gear, SCADA equipment and future relaying requirements.

2.2.3 Network Upgrade work to be completed by the Transmission Provider and initially

paid for by Interconnection Customer (with costs being refundable as identified in the GIP / GIA):

• Design, install and remove temporary “shoo fly” transmission line to facilitate the construction of Transmission Provider Substation. Estimated cost is $355,000

• Design, procure and install RTU. Review and approve IC design, materials and construction drawings for Transmission Provider Substation. Have on-site inspection during the construction of Transmission Provider Substation by IC contractor. Estimated cost for these activities is $377,000.

• Design, procure and install telecommunication equipment to support voice, SCADA, metering and protection requirements. Estimated cost is $379,000.

The total estimated cost for Network Upgrade work associated with Transmission Providers Substation is $1,111,000.



2.3 Bravo Dome Substation Work Description

2.3.1 Work to be completed and paid for by the Interconnection Customer: • None

2.3.2 Work to be completed by the Transmission Provider and initially paid for by

Interconnection Customer (with costs being refundable as identified in the GIP / GIA):

• Install revenue metering and a RTU.

Estimated cost for all of the work at Bravo Dome Substation is $59,000. The cost for this work is included in the Network Upgrades estimate.

2.4 Clapham Substation Work Description

2.4.1 Work to be completed and paid for by the Interconnection Customer: • None

2.4.2 Work to be completed by the Transmission Provider and initially paid for by

Interconnection Customer (with costs being refundable as identified in the GIP / GIA):

• Install PQ meter, upgrade line relaying and remove previously installed revenue metering.

Estimated cost for all of the work at Clapham Substation is $72,000. The cost for this work is included in the Network Upgrades estimate.

2.5 Springer Substation Work Description

2.5.1 Work to be completed and paid for by the Interconnection Customer:

• None

2.5.2 Work to be completed by the Transmission Provider and initially paid for by Interconnection Customer (with costs being refundable as identified in the GIP / GIA):

• Modify protective relay settings at Springer Substation • Replace existing 115kV, 200/400:5, 1.5 TRF (600A rated) metering current

transformers at Springer Substation with 500/1000:5, 1.5 TRF (or higher) units. • Modify SCADA scaling factors with the installation of the new metering current

transformers. • Remove existing 800A wave trap at Springer Substation.

Estimated cost for all of the work at Springer Substation is $117,000. The cost for this work is included in the Network Upgrades estimate.



2.6 Gladstone Substation Work Description

2.6.1 Work to be completed and paid for by the Interconnection Customer:

• None

2.6.2 Work to be completed by the Transmission Provider and initially paid for by Interconnection Customer (with costs being refundable as identified in the GIP / GIA):

• Modify protective relay setting at Gladstone Substation Estimated cost for all of the work at Gladstone Substation is $9,000. The cost for this work is included in the Network Upgrades estimate.

• Total for Network Upgrades required for delivery (not including work at Transmission Providers Substation) is $257,000

• Total for all Network Upgrades required for interconnection and delivery is

$1,368,000. 3. IC FACILITIES REACTIVE POWER AND VOLTAGE REGULATION

CAPABILITY Results of the SIRS indicate that the IC will likely not need to install additional equipment to provide the voltage regulation and reactive support operational capabilities required by the TP. Verification of the Project’s (generation facilities) output capabilities (MW, MVAR, p.f., Voltage Regulation) as measured at the Point of Interconnection (POI) bus will be required when the Project is ready for commercial operation. This verification will be required to be demonstrated by the IC to the TP by supplying a detailed reactive power and voltage regulation capability technical study report to the TP, based upon the final “as-built design”, prior to the final commissioning of the IC facilities. The IC facilities capability to meet the TP’s operational criteria will then be demonstrated to the TP at the time of commissioning of the IC facilities, before the IC project can be deemed suitable for commercial operation. Detailed discussion on this topic is contained in the SIRS Final Report.

4. SCHEDULE

A Gantt chart schedule is attached for the engineering and construction of the Network Upgrades. The schedule starts with the receipt of funds and execution of an E&P agreement to be followed by a timely execution of the LGIA, or with the receipt of funds and execution of a LGIA. The estimated duration from the receipt of funds is 12 months. The current estimated in-service date is May 1, 2012.



5. REFERENCES

[1] Jeremy Sneath and Andrew Isaacs of Electranix Corporation, “Interconnection System Impact Study Re-Study Final Report – May 28, 2010 Interconnection Request No. TI-04-1214 - 88MW Wind Energy Large Generating Facility in North Eastern New Mexico” prepared for Tri-State Generation and Transmission Association, Inc.

6. LIST OF ATTACHMENTS AND FIGURES

• Figure 1: Transmission Provider Substation: One-Line Diagram • Figure 2: Schedule - Network Upgrade MS Project Gantt Chart, Dated 8/20/10

• Detailed Cost Estimates (Available Only to IC Upon Request)

o NM Wind Farm Substation estimate, dated 7/23/10 o Shoo Fly estimate, dated 7/29/10 o Telecommunication estimate, dated 7/20/10 o Bravo Dome Revenue Metering estimate, dated 7/24/10 o Springer Metering CT Upgrade estimate, dated 7/24/10 o Clapham Substation estimate, dated 7/24/10 o Gladstone Relay Setting Modification estimate, dated 8/20/10



Figure 1: Transmission Provider Substation: One-Line Diagram



Figure 2: Schedule - Network Upgrade MS Project Gantt Chart, Dated 8/20/10

INTERCONNECTION FACILITIES RE-STUDY FINAL REPORT · 9/30/2010 · TI-04-1214 Final Fac Re-Study...

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