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Subject:	Stage 0 Transformer Effective GIC results, with effects of retirements approximated, are posted
From:	"Richardson, Ben" <[log in to unmask]>
Reply To:	Planning Geomagnetic Disturbance Task Force <[log in to unmask]>
Date:	Fri, 1 Jun 2018 15:29:28 +0000
Content-Type:	multipart/related
Parts/Attachments:	text/plain (9 kB) , text/html (17 kB) , image001.png (9 kB)

***** EXTERNAL email. Please be cautious and evaluate before you click on links, open attachments, or provide credentials. *****

PGDTF:

I have posted results from our most recent GIC models (the models posted on 04132018) but with the GIC files from those models modified to approximate the effect of the 14 generator retirements that are listed in the December 2017 CDR ( see: http://www.ercot.com/gridinfo/resource ).

Transformer GIC flow information was calculated with the transformer vector group designation for the GSU associated with the (retirement) units listed below changed to "Dd".  I have provided the complete *.gic files in this posting but have also provided the following files to help you locate the modified records:


*         List_deltaRetirements_17SSWG_2021_SUM1_Final_06292017_DeVG_RunIdvs_04122018_ERCOT_01.txt

*         List_deltaRetirements_17SSWG_2021_MIN_Final_06292017_DeVG_RunIdvs_04122018_ERCOT_02.txt

List of Retirement Units


*         GREENS BAYOU STG U5

*         BIG BROWN UNIT1

*         BIG BROWN UNIT2

*         MONTICELLO UNIT1

*         MONTICELLO UNIT2

*         MONTICELLO UNIT3

*         SANDOW UNIT4

*         SANDOW UNIT5

*         PEARSALL_PEARS_1

*         PEARSALL_PEARS_2

*         PEARSALL_PEARS_3

*         S R BERTRON SRBGT_2

*         S R BERTRON SRBG_3

*         S R BERTRON SRBG_4

The files listed below exclusively contain Transformer GIC flow information resulting from these modifications.  Please note that there are still no ERCOT Transformers that exceed the 75 Amp Effective GIC flow threshold.


*         Stage_0_Transformer_Effective_GIC_SUM1_Results_04122018_ERCOT_01_04072018_deltaRetirements

*         Stage_0_Transformer_Effective_GIC_MIN_Results_04122018_ERCOT_02_04072018_deltaRetirements




[cid:image001.png@01D3F8F9.4B2816E0]


A. Benjamin Richardson, P.E.(Colorado)
Transmission and Interconnection Studies
2705 West Lake Drive
Taylor, TX 76574
O: 512-248-4505 | M:720-470-3643





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