PGRR Comments
PGRR Number / 005 / PGRR Title / New Section 6.3, Procedure for theProcess for Developing Short Circuit Database Cases (Portion of SPWG Procedures)Date
Submitter’s Information
Name / Wayne Kemper on behalf of the Planning Working Group (PLWG)
E-mail Address /
Company / CenterPoint Energy
Phone Number / 713-207-2192
Cell Number
Market Segment / Investor Owned Utility (IOU)
Comments
Revised Cover Page Language
PGRR Number / 005 / PGRR Title / New Section 6.3, Process for DevelopingProcedure for the Short Circuit CasesDatabase (Portion of SPWG Procedures)
Revised Proposed Guide Language
ERCOT Planning Guide
Section 6: Data/Modeling
Month Day, Year
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PGRR Comments
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6.3 Process for Developing Short Circuit Cases 3
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6.3 Process for Developing Short Circuit Database 3
· DATA/MODELING
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6.3 Process for Developing Short Circuit DatabaseCases
(1) This Section describes the process for the development of the short circuit databasecases used for planning purposes. For other non-planning aspects relating to system protection and digital fault recorder requirements, see ERCOT Nodal Operating Guide Section 6, Disturbance Monitoring and System Protection.
(21) ERCOT shall collect the short circuit data sets or data updates developed by each Transmission Service Provider (TSP) and shall compile and maintain the short circuit cases. using a collaborative, multiple pass process. The current year (CY) short circuit case is compiled and published by ERCOT induring the first quarter of each calendar year. The future year (FY) short circuit cases for years two through five are compiled and published by ERCOT induring the second quarter of the current calendar year. The transmission and generation systems of each equipment owner in ERCOT shall be represented completely including positive and zero sequence data.
(32) The transmission and generation systems of each facility owner in ERCOT shall be represented completely including positive and zero sequence data. TSPsERCOT shall model generation system data provided by the GenerationResource Entity ,( see Planning Guide Section 6.8, Generation Resource Data Procedures for details).
(43) All Generation Resources that have signed Interconnection Agreements (IA) with an ERCOT TSP or a commitment letter from a Municipally Owned Utility (MOU) or an Electric Cooperative (EC) building a generation resource shall be included and shown as On-Line in the short circuit cases.
(454) Each common bus within both the short- circuit case and the corresponding load flow case shall have a matching bus name and matching bus number. Each additional bus added to the short- circuit case as necessary to perform short- circuit studies shall be assigned a name and number that does not conflict with pre-existing bus numbers used in the current set of load flow cases.
(565) The positive sequence impedance of Transmission Elements used in both the load flow and short circuit databasescases shall be the same.
(6) All Generation Resources that can be reasonably expected to be operational shall be included and shown as On-Line in the short circuit cases.
(76) Zero sequence data shall include mutual impedance of multi-circuit transmission lines and of adjacent circuits onwithin the same right-of-way, unless the TSP considers such impedance to be insignificant for studies made from this data.
6.3 Procedure for the Short Circuit Database
This data shall be maintained by ERCOT Transmission Services. The transmission and generation systems of each equipment owner in ERCOT shall be represented completely for the subject year. Transmission providers shall model generation data to be provided by the generator owner. if they are the designated representatives for power generating companies. To the extent practicable, bus numbers and names shall match the names and bus numbers of corresponding buses in the load flow cases. Additional bus numbers used in the short circuit case shall not conflict with bus numbers used in the load flow case. In case that it becomes necessary to limit the number of buses or lines of any area, the allotment of maximum number of elements shall be agreed to by the working group as a group. Positive sequence impedance of circuit elements shall be the same in both the load flow and short circuit databases.
Minimum short circuit data applying to the near future, and therefore being principally useful for the purposes of protective relaying, shall consist of positive and zero sequence systems at predicted conditions for the summer peak (June 30th) of the current year and the following four years. All generator units that can be reasonably expected operational shall be included and on-line. Zero sequence data shall include mutual impedance of multi-circuit lines and of adjacent circuits on the same right-of-way, unless the representative of the area who is in charge of preparation of the data considers such impedance to be insignificant in studies made from this data.
Updating of the new data may either proceed on the basis of revision of existing data or by preparing complete new data sets, at the option of the individual area representatives. The previous year’s data may be re-used if there are no changes.
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