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Impact of 500 kV Tie Line Operations on Import Capability and Phase Angle Adjustments

This document discusses the implications of limiting import capability at 500 kV tie lines, focusing on the influence of phase angle changes. It addresses operating procedures for handling generation isolation at Richmond, CT, and the application of series devices. The report provides examples of Delta P studies and operational adjustments regarding transformers and tie line switches. By analyzing scenarios involving Delta P variations, it highlights the effects of operating procedures on power flow management and system stability.

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Impact of 500 kV Tie Line Operations on Import Capability and Phase Angle Adjustments

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  1. PEC 500 kV Limit on Import Capability • Impact on phase angle • Additional 500 kV ties • Operating procedures • A Series device • Delta P studies

  2. Impact of 500 kV Tie Lines

  3. Example Delta PRichmond CT, 0.355 pu

  4. Operating ProcedureIsolate generation from 500 at Richmond 500 - 0.15 pu Xfrmr#1 Switched back IN 500kV Line SwitchedCLOSED Xfrmr#2 Switched OUT Xfrmr#2 Switched back IN Xfrmr#1 Switched OUT Brunswick #2 Max Delta_P of 0.068 pu Richmond CT#1 Max Delta_P of 0.15 pu

  5. Operating ProcedureRestore 500kV Path via Cumberland Terminal- 0.415 pu Switch IN Newport Line Switch IN Cumberland Line 0.130 pu in opposite direction Switch OUT Cumberland Line 0.066 pu ~1400 MW ~1100 MW 0.415 pu ~240 MW ~800 MW

  6. Example of Series Reactor Original Delta P, reduced to two smaller Delta P’s Reactor bypass switch closed, removing series reactor Line Closed with Reactor in series with line

  7. Opening vs. ClosingRichmond CT • ClosingDeltaP 0.355 pu • OpeningDeltaP 0.307 pu

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