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Northstar 300 MW AI CampusShared project

ONC-FS-104 Rev 04

Large Load Facilities StudyOncorIssued yesterday

ONC-FS-104Rev 04 · §4.3 · Figure 4.3-1

REGIONAL SUPPLYNORTH138 kVL-101EAST138 kVL-103PLANNED ADDITION · REV 04UTILITYCUSTOMER SUBSTATIONPoint of interconnection · 138 kVTX-01138/34.5 kV75/100 MVA34.5 kV bus27.6 kAFault duty, Rev 0333.8 kAFault duty, Rev 04Rev 03: 27.6 kASG-0134.5 kV switchgearRated 31.5 kARated 31.5 kARequired 40 kA minimum40 MWFirst phaseSource evidenceONC-FS-104 · Rev 04 · §4.334.5 kV bus fault duty27.6 kA → 33.8 kAMinimum switchgear rating40 kAAffected recordsNAC-EQ-221 · Rev 02SG-01 submittal, 31.5 kAPreparedPO-24031Oncor minimum not met, 31.5 kA on orderPrepared

Illustrative study figure. Engineering review required.

Scroll to inspect the drawing.

What changed

New revision
34.5 kV fault duty
27.6 kA → 33.8 kA
Switchgear minimum
40 kA
SG-01 rated
31.5 kA

Open an engineering review of SG-01

Paused
Action
Create engineering review for SG-01
Fault duty
27.6 kA to 33.8 kA
Rating
31.5 kA on PO-24031, 40 kA required
Reviewer
Jordan Lee
RejectApprove exact action

Follow a utility requirement.

See which equipment and project records a revised utility study affects.

  1. 1The substation the project has to energize.
  2. 2Each piece of equipment is a symbol on the single-line.
  3. 3One record per piece, under one tag.
  4. 4The utility raises fault duty to 33.8 kA.
  5. 5Only SG-01 and four records react.
  6. 6Four revisions, ready for review.

Northstar 300 MW AI Campus · 138 / 34.5 kV substation

  • ONC-FS-104 · Rev 04 · §4.3SG-01 is 31.5 kA in the design and on the orderFault duty 27.6 kA to 33.8 kA. Switchgear minimum 40 kA.
  • Switchgear submittalNAC-EQ-221 · Rev 0231.5 kA to 40 kAPrepared for review
  • Purchase orderPO-24031Change request, 40 kA lineupPrepared for review
  • Protection studyNAC-E-214 · Rev 03Rerun at 33.8 kAPrepared for review
  • Schedule activityNAC-CX-4410Retest before NAC-MIL-5000Prepared for review

Illustrative substation and single-line.

Catch the mismatch before it reaches site.

The utility has revised its requirement. The equipment order still carries the old rating. Vela connects the two.

SG-01 · Equipment duty

The order is below the new requirement.

Engineering review needed
SG-01 on orderPO-24031
31.5 kA
Revised fault dutyRev 04 · §4.3
33.8 kA
Required equipment ratingRev 04 minimum
40 kA

Trace the requirement

  1. Utility studyONC-FS-104 Rev 04

    Fault duty changed from 27.6 kA to 33.8 kA.

  2. Equipment registerNAC-PROC-012

    SG-01 still carries 31.5 kA.

  3. Purchase orderPO-24031

    Reconcile the rating before release of a change.

Example project · NorthstarStudy §4.3 · Fault duty at 34.5 kV
Equipment & procurementProject delivery

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