Plains and Eastern Hvdc

Engineering Support Services for:

Plains and Eastern HVdc

Clean Line Energy Partners

Report R1308.00.00

Specification Development

Prepared by: TransGrid Solutions Inc. 200 – 150 Innovation Dr. Winnipeg, MB R3T 2E1 CANADA

www.transgridsolutions.com

June 30, 2014

Clean Line Energy Partners Plains and Eastern HVdc Specification Development

Disclaimer This report was prepared by TransGrid Solutions Inc. (“TGS”), whose responsibility is limited to the scope of work as shown herein. TGS disclaims responsibility for the work of others incorporated or referenced herein. This report has been prepared exclusively for Clean Line Energy Partners and the project identified herein and must not be reused or modified without the prior written authorization of TGS.

Revisions

Project Name: Plains and Eastern HVdc

Document Specification Development Title:

Document Draft report Type:

Document R1308.00.00 No.:

Last Action June 30, 2014 Date:

Rev. Status Prepared Checked By Date Comments No. By

00 IFC R. Kolt M. Rashwan June 30, 2014 D. Kell

Legend of Document Status: Approved by Client ABC Draft for Comments DFC Issued for Comments IFC Issued for Approval IFA Issued for Information IFI Returned for Correction RFC Approval not Required ANR

Clean Line Energy Partners Plains and Eastern HVdc Specification Development

Table of Contents

Disclaimer ...... i Revisions ...... i Table of Contents ...... 2 Glossary of Terms and Definitions ...... 10 1. Plains & Eastern Clean Line Project ...... 14 1.1. Schedule ...... 14 1.2. Scope of Work ...... 15 1.2.1. System Engineering and Studies ...... 15 1.2.2. Engineering and Detailed Design ...... 16 1.2.3. Manufacturing and/or Supply of Equipment ...... 17 1.2.4. Civil Works ...... 19 1.2.5. Spare Parts ...... 20 1.3. Services Provided by the Contractor ...... 22 1.3.1. Project Management ...... 22 1.3.2. Training of Personnel ...... 23 1.3.3. Interface Coordination ...... 24 1.3.4. Performance/Functional Guarantees ...... 25 1.3.5. Installation, Testing and Commissioning ...... 25 1.3.6. Sequencing of Commissioning Activities ...... 25 1.3.7. Future Developments and Expected Equipment Lifetimes ...... 26 1.3.8. P&E-Supplied Equipment, Facilities and Services ...... 26 2. Site and Technical Information ...... 28 2.1. Description of the AC Systems ...... 28 2.2. Location and Site Conditions ...... 28 2.3. Location(s) ...... 28 2.3.1. Oklahoma ...... 28 2.3.2. Tennessee ...... 28 2.3.3. Arkansas ...... 28 2.4. Location Map ...... 29 2.5. Aerial Overview ...... 29 2.6. Site Access ...... 29 2.7. Soil information...... 29 2.8. Service Water ...... 30 2.9. Design Parameters ...... 30 2.9.1. Site and Environmental Data ...... 30 2.10. Shielding and Lightning Protection...... 31 2.11. Seismic data ...... 32 2.12. Electrical Data and Design Criteria ...... 32 2.12.1. Normal Steady State Voltages ...... 33 2.12.2. Dynamic Criteria ...... 33 2.12.3. Transient Voltage Dip ...... 34 2.12.4. Transient Overvoltage ...... 34 2.12.5. Frequency Criteria ...... 34 2.12.6. Negative Sequence Criteria ...... 35 2.13. Reactive Power Capability of the AC System ...... 35 2.14. Generation Near the Converter Stations ...... 36 2.15. Existing HVdc ...... 36 2.16. Background Harmonics ...... 36 2.17. Harmonic Impedances ...... 39 2.18. Communication System ...... 40 2.19. HVDC Transmission Line: ...... 40 2.19.1. Conductor: ...... 40 2.19.2. Mutual and Self Impedances ...... 40

Clean Line Energy Partners Plains and Eastern HVdc Specification Development 2.19.3. Insulation: ...... 41 2.20. Dedicated Metallic Return Line (DMR)...... 41 3. General Requirements ...... 42 3.1. Standards ...... 42 3.1.1. General Standards ...... 43 3.1.2. Circuit Breakers ...... 46 3.1.3. Current Transformers, Voltage Transformers, and Capacitive Voltage Transformers ...... 47 3.1.4. Bushings ...... 48 3.1.5. Insulators ...... 48 3.1.6. Surge Arrestors ...... 49 3.1.7. Cubicles and Panels ...... 50 3.1.8. Disconnect Switches ...... 50 3.1.9. Capacitors ...... 51 3.1.10. Communication Equipment and Line Traps ...... 52 3.1.11. Converter Valves ...... 53 3.1.12. Protection and Control Equipment ...... 53 3.1.13. Reactors ...... 54 3.1.14. Motors ...... 54 3.1.15. Material Standards ...... 54 3.1.16. Clamps and Connectors ...... 55 3.1.17. Bus Work and Insulators ...... 55 3.1.18. Batteries and Battery Chargers ...... 56 3.1.19. Wires and Cables ...... 56 3.1.20. Air Conditioning ...... 57 3.1.21. Fire Protection ...... 58 3.1.22. Seismic Performance ...... 58 3.1.23. Safety Requirements ...... 58 4. Performance Requirements ...... 59 4.1. Transmission System Rating ...... 59 4.2. DC Power Circuit Requirements ...... 60 4.3. Transmission System Rating ...... 60 4.3.1. Nominal Continuous Ratings ...... 60 4.3.2. Direct Voltage ...... 61 4.3.3. Direction of Power Flow ...... 62 4.3.4. Operating Modes ...... 62 4.3.5. Power Transmission Requirements ...... 62 4.4. Dynamic Performance ...... 63 4.4.1. Control System Stability ...... 63 4.4.2. Response Times ...... 64 4.4.3. Commutation Failure Performance ...... 70 4.5. Dynamic Performance Demonstration ...... 71 4.6. Performance of HVdc with Wind ...... 72 4.7. Reactive Power Controls ...... 72 4.7.1. Reactive Power Control Objectives...... 72 4.7.2. Dynamic Reactive Power Compensation ...... 73 4.8. Reactive Compensation and Voltage Control ...... 73 4.8.1. Reactive Power Control and Switching of Elements ...... 74 4.8.2. Voltage Change on Switching ...... 74 4.9. AC Harmonic Filters ...... 75 4.9.1. General ...... 75 4.9.2. Definition of Performance ...... 76 4.9.3. Converter Harmonic Currents ...... 77 4.9.4. Filter Detuning ...... 77 4.9.5. AC System Harmonic Impedance ...... 77 4.9.6. Calculation of Performance ...... 78 4.9.7. Performance Requirements ...... 78 4.9.8. Rating Requirements ...... 79 R1308.00.00 June 30, 2014 © TransGrid Solutions Inc, 2014 3

Clean Line Energy Partners Plains and Eastern HVdc Specification Development 4.9.9. Calculation of Ratings ...... 79 4.10. DC Filters ...... 80 4.10.1. Design Requirements ...... 80 4.10.2. Calculation of Performance ...... 81 4.10.3. Performance Criteria ...... 84 4.10.4. DC Filter Rating ...... 84 4.10.5. DC Filter Studies ...... 85 4.11. DC Circuit Resonance ...... 85 4.12. Insulation Coordination ...... 85 4.12.1. Limitation of Overvoltage ...... 86 4.12.2. Requirements ...... 87 4.12.3. Definitions ...... 87 4.12.4. Determination of Overvoltages ...... 88 4.12.5. Selection of Insulation Level ...... 90 4.13. Interference Communication and Control Systems ...... 93 4.13.1. Radio Interference (RI) ...... 93 4.13.2. Television Interference (TVI) ...... 94 4.13.3. Interference with Power-Line Carrier ...... 94 4.13.4. Interference with Control System and Other Communication Systems ...... 94 4.14. Audible Noise ...... 95 4.14.1. Site measurements ...... 95 4.14.2. Verification of Performance ...... 96 4.14.3. Audible Noise Verification Assessment ...... 96 5. AC and DC Switchyards ...... 97 5.1. One Line Diagram ...... 97 5.2. AC Switchyard ...... 97 5.2.1. Design Criteria ...... 97 5.2.2. AC Harmonic Filters ...... 97 5.3. DC Power Circuit ...... 98 5.3.1. Arrangement ...... 98 5.3.2. DC Power Circuit Switching Requirements ...... 98 5.4. Physical Arrangements ...... 98 5.4.1. Requirements ...... 99 5.4.2. Electrical and Safety Clearances ...... 101 5.4.3. Electric Field Strength ...... 101 5.5. Grounding ...... 101 5.6. Electrical Buswork ...... 101 5.6.1. Flexible Strain Bus ...... 101 5.7. Construction Standards ...... 102 6. Equipment Specifications ...... 103 6.1. Thyristor Valves and Associated Equipment ...... 103 6.1.1. Definitions ...... 103 6.1.2. General Requirements ...... 103 6.1.3. Maintenance ...... 104 6.1.4. Valve Overvoltage Capability ...... 104 6.1.5. Valve Trans