Common use of NYSEG Xxxxxxxxx 34.5kV Substation Clause in Contracts

NYSEG Xxxxxxxxx 34.5kV Substation. Restoration of the differential bus protection scheme will not be required for limited operations, provided that the Developer installs an anti-backfeed relay in the NYSEG Xxxxxxxxx 34.5 kV Substation. Plans for this relay scheme must be reviewed and accepted by the Connecting Transmission Owner and will require the plant to hard connect to the Connecting Transmission Owner’s owned VTs. The spare winding of the existing Connecting Transmission Owner’s instrument transformers in the NYSEG Xxxxxxxxx 34.5kV Substation may be used temporarily in setting up this relay scheme. The Connecting Transmission Owner has not finalized its drawings of recent work in the NYSEG Xxxxxxxxx 34.5 kV Substation, but is working to finalize those plans. Once the Developer has those plans, its contractor will provide the Connecting Transmission Owner with drawings of how the anti-backfeed relay would be added to that system for its review and acceptance. Upon acceptance, the Developer’s contractor would install the components of that relay scheme. Note that there is a Connecting Transmission Owner switch T20-74 that is located between the two Xxxxxxxxx station service supplies. If this switch is ever open, the voltage provided for the anti-backfeed will not work appropriately for the ES4 station service and thus another need to complete the 34.5 kV bus protection as agreed to by the Limited Operations End Date. The Connecting Transmission Owner will perform a ground network coordination study at Developer’s expense prior to commencement of limited operations. To the extent that any relay settings need to be changed as a result of project operation, that work will be coordinated to occur prior to start-up, but needs to be closely tied to the actual plant startup and main GSU energization. It is estimated that the coordination study itself will take up to two weeks as a best guess and any required relay setting changes identified as part of that study will take up to an additional 2 weeks to be made at the various stations in the 115 kV network by the Connecting Transmission Owner’s personnel. The Developer will provide the Connecting Transmission Owner with the test results from the protective relays associated with the operation of the B4-72 breaker. This would also include all CT tests, breaker functional checks, etc. The terms and conditions set forth in Section 5.10 of this Agreement shall apply to the Developer’s and Connecting Transmission Owner’s responsibilities in connection with the Limited Operations Work described above, as though Developer were constructing DAFs, except that the time frames associated with Developer’s submission of initial and final specifications and drawings and as-built drawings for the Limited Operations Work to the Connecting Transmission Owner and NYISO, and the time frames associated with the Connecting Transmission Owner’s and NYISO’s review and comment on such initial and final specifications and drawings, shall be those time frames set forth in the Milestone Schedule for Limited Operations Work included below in Section 3 of this Appendix C, rather than the time frames set forth in Section 5.10.

NYSEG Xxxxxxxxx 34.5kV Substation. Restoration of the differential bus protection scheme will not be required for limited operations, provided that the Developer installs an anti-backfeed relay in the NYSEG Xxxxxxxxx 34.5 kV Substation. Plans for this relay scheme must be reviewed and accepted by the Connecting Transmission Owner and will require the plant to hard connect to the Connecting Transmission Owner’s owned VTs. The spare winding of the existing Connecting Transmission Owner’s instrument transformers in the NYSEG Xxxxxxxxx 34.5kV Substation may be used temporarily in setting up this relay scheme. The Connecting Transmission Owner has not finalized its drawings of recent work in the NYSEG Xxxxxxxxx 34.5 kV Substation, but is working to finalize those plans. Once the Developer has those plans, its contractor will provide the Connecting Transmission Owner with drawings of how the anti-backfeed relay would be added to that system for its review and acceptance. Upon acceptance, the Developer’s contractor would install the components of that relay scheme. Note that there is a Connecting Transmission Owner switch T20-74 that is located between the two Xxxxxxxxx station service supplies. If this switch is ever open, the voltage provided for the anti-backfeed will not work appropriately for the ES4 station service and thus another need to complete the 34.5 kV bus protection as agreed to by the Limited Operations End Date. The Connecting Transmission Owner will perform a ground network coordination study at Developer’s expense prior to commencement of limited operations. To the extent that any relay settings need to be changed as a result of project operation, that work will be coordinated to occur prior to start-up, but needs to be closely tied to the actual plant startup and main GSU energization. It is estimated that the coordination study itself will take up to two weeks as a best guess and any required relay setting changes identified as part of that study will take up to an additional 2 weeks to be made at the various stations in the 115 kV network by the Connecting Transmission Owner’s personnel. The Developer will provide the Connecting Transmission Owner with the test results from the protective relays associated with the operation of the B4-72 breaker. This would also include all CT tests, breaker functional checks, etc. The terms and conditions set forth in Section 5.10 of this Agreement shall apply to the Developer’s and Connecting Transmission Owner’s responsibilities in connection with the Limited Operations Work described above, as though Developer were constructing DAFs, except that the time frames associated with Developer’s submission of initial and final specifications and drawings and as-built drawings for the Limited Operations Work to the Connecting Transmission Owner and NYISO, and the time frames associated with the Connecting Transmission Owner’s and NYISOXXXXX’s review and comment on such initial and final specifications and drawings, shall be those time frames set forth in the Milestone Schedule for Limited Operations Work included below in Section 3 of this Appendix C, rather than the time frames set forth in Section 5.10.