About Sample5_aes.png

About this drawing

What it is: Substation switching one-line diagram, 345/34.5 kV collector substation for Somerset Solar Project (AES / Tetra Tech, HV-E.02.01, preliminary, issued for 94-C permit)
What it does: Collects 34.5 kV solar collector circuits on a main bus and steps them up through XFMR T1 to export power over a 345 kV tie to Kintigh Substation; also carries cap banks/filters, station service and metering.
Analyse next: Build an RBD / minimal cut sets of the export path from the 34.5 kV collector circuits to the 345 kV Kintigh connection, to identify single points of failure (main transformer, 345 kV breaker, main bus) limiting plant export availability; later, a capacity-weighted availability study per feeder.
The drawing is a power-delivery single-line: energy flows from collector circuits through feeder breakers, main bus, T1 and 52-H1 to the grid. Whether a path stays intact is the core question, so an RBD of the supply (export) path fits.

What we still need

Success criterion / required export: Engineer must confirm whether success is 'any export' or a minimum MW (e.g. N feeders); the any_path rule makes feeder failures non-critical.
PV_COLLECTOR / MV circuits 01-05 (PV-E.02.01) and Kintigh: Collector circuits and the Kintigh interconnection are off this sheet; feeder content, circuit lengths and any Kintigh-side breakers are unknown. Drawing is preliminary (Note 1, 6).
89-B1 / XFMR T1 secondary: No 34.5 kV main breaker shown between T1 and Main Bus 1; confirm this is intended (T1 faults cleared only by 52-H1 and feeder breakers). Also cap bank need (Note 2) not modelled.

How this result was made

AI readingexactyou

Read the drawing23 parts found on Sample5_aes.png, 1 added · reading confidence 0.90
Connect the parts27 connections, from PV_COLLECTOR to KINTIGH, plus what can fail and the boundary
Find every path5 ways power reaches the load
Work out the cut sets22 cut sets: any one of 6 parts failing cuts the supply: none of them has a backup. Computed exactly from the paths and the assumptions, so confirming those confirms these.
Your review2 questions, about a minute; the drawing review is separate.

If the answer to question 1 is wrong, nothing else matters. Start there.

Is the result right?

1. What has to keep working?

Power from Solar collector system (off-sheet, PV-E.02.01) to Kintigh Substation 345kV (grid), counting failures of breaker, disconnector, transformer, busbar, line.

Why the AI chose this. Check it, don't take it.

Start and end: Source: aggregate solar collector system at the 34.5 kV MV circuit terminations (off-sheet PV-E.02.01). Sink: Kintigh 345 kV substation at the end of the 159 ft overhead tie.. These are the edges of this sheet's scope; arrays and Kintigh internals are on other drawings/owned by others.
Scope: 345/34.5 kV substation export path: 34.5 kV collector circuits 01-05, feeder disconnects/breakers, Main Bus 1, 89-B1, XFMR T1, 52-H1, 89-H1 and the 345 kV tie to Kintigh.. The substation's function is to deliver solar output to the grid; this is the path that delivers it.
What can fail: Series power-carrying equipment whose failure interrupts export: breakers, disconnect switches, the main transformer, the main bus and the conductors/feeders. Source and sink are boundary points treated as perfect.

Right: that is what has to keep working.If not, what should it be?

2. These 6 parts each take it down alone

Click one to light it up on both views.

34.5kV MAIN BUS 1 34.5kV Main Bus 1, 3000A
345kV_OH_TIE 345kV overhead connection to Kintigh (approx 159 ft)
52-H1 52-H1 362kV 2000A
89-B1 89-B1 38kV 3000A
89-H1 89-H1 362kV 2000A motor-operated
XFMR T1 XFMR T1 345/34.5/13.8kV 84/112/140 MVA

What could change this list

Couldn't read Success criterion / required export: Engineer must confirm whether success is 'any export' or a minimum MW (e.g. N feeders); the any_path rule makes feeder failures non-critical.
Couldn't read PV_COLLECTOR / MV circuits 01-05 (PV-E.02.01) and Kintigh: Collector circuits and the Kintigh interconnection are off this sheet; feeder content, circuit lengths and any Kintigh-side breakers are unknown. Drawing is preliminary (Note 1, 6).
Couldn't read 89-B1 / XFMR T1 secondary: No 34.5 kV main breaker shown between T1 and Main Bus 1; confirm this is intended (T1 faults cleared only by 52-H1 and feeder breakers). Also cap bank need (Note 2) not modelled.
Left out: Partial-capacity loss (losing one or more feeders reduces MW export). any_path only captures total loss of export; capacity weighting needs a separate study.
Left out: CTs, VTs (345CCVT1, 35VT1, VT-C1), surge arresters, metering CM1P/CM1B. Not series current-carrying elements for continuity; protection/metering misoperation would need a fault tree.
Left out: Capacitor banks CAP-1/CAP-2, harmonic filter, 52-CS1/52-CS2, 89-C1.x, GSC-1/GSC-2. Reactive support branches, not on the export path; their need is pending load-flow/harmonics study (Note 2).
Left out: Station service SS1/89-SS1, control building, NGR-1. Auxiliary loads and neutral grounding; failure of auxiliary power or protection DC that could trip breakers is a common-cause not represented.
Left out: Protection spurious trips, grounding-switch interlocks (Note 5), Kirk-key interlocks. Control logic, outside a structural RBD.
Left out: Spare position 89-F3.B ('Space'). No circuit installed.

Right: that is the full list.What's missing, or shouldn't be here?

Anything else?

Send rbd review

Opens your email with what you ticked, what you didn't, and your note.

Paths

Power reaches the load by 5 paths. Click one to light it up.

Path 1 MV_CKT_01 → 89-F1.A → 52-F1 → 89-F1 → 34.5kV MAIN BUS 1 → 89-B1 → XFMR T1 → 52-H1 → 89-H1 → 345kV_OH_TIE
Path 2 MV_CKT_02 → 89-F1.B → 52-F1 → 89-F1 → 34.5kV MAIN BUS 1 → 89-B1 → XFMR T1 → 52-H1 → 89-H1 → 345kV_OH_TIE
Path 3 MV_CKT_03 → 89-F2.A → 52-F2 → 89-F2 → 34.5kV MAIN BUS 1 → 89-B1 → XFMR T1 → 52-H1 → 89-H1 → 345kV_OH_TIE
Path 4 MV_CKT_04 → 89-F2.B → 52-F2 → 89-F2 → 34.5kV MAIN BUS 1 → 89-B1 → XFMR T1 → 52-H1 → 89-H1 → 345kV_OH_TIE
Path 5 MV_CKT_05 → 89-F3.A → 52-F3 → 89-F3 → 34.5kV MAIN BUS 1 → 89-B1 → XFMR T1 → 52-H1 → 89-H1 → 345kV_OH_TIE

Parts not on the drawing: PV_COLLECTOR.

Summary

Single points of failure

6 components: if any one of these fails on its own, the supply is lost.

{34.5kV MAIN BUS 1}
{345kV_OH_TIE}
{52-H1}
{89-B1}
{89-H1}
{XFMR T1}

Pairs

No pair of failures cuts the supply.

Click a set to highlight its components on the drawing and in the block diagram; click it again to clear.

Assumptions

Scope: 345/34.5 kV substation export path: 34.5 kV collector circuits 01-05, feeder disconnects/breakers, Main Bus 1, 89-B1, XFMR T1, 52-H1, 89-H1 and the 345 kV tie to Kintigh.. The substation's function is to deliver solar output to the grid; this is the path that delivers it.

Boundary: Source: aggregate solar collector system at the 34.5 kV MV circuit terminations (off-sheet PV-E.02.01). Sink: Kintigh 345 kV substation at the end of the 159 ft overhead tie.. These are the edges of this sheet's scope; arrays and Kintigh internals are on other drawings/owned by others.

Can fail: breaker, disconnector, transformer, busbar, line. Series power-carrying equipment whose failure interrupts export: breakers, disconnect switches, the main transformer, the main bus and the conductors/feeders. Source and sink are boundary points treated as perfect.

Success: any_path. Export to the grid is considered available while at least one collector circuit is connected through to Kintigh; this is a continuity (not capacity) criterion.

Not modelled:

Partial-capacity loss (losing one or more feeders reduces MW export): any_path only captures total loss of export; capacity weighting needs a separate study.
CTs, VTs (345CCVT1, 35VT1, VT-C1), surge arresters, metering CM1P/CM1B: Not series current-carrying elements for continuity; protection/metering misoperation would need a fault tree.
Capacitor banks CAP-1/CAP-2, harmonic filter, 52-CS1/52-CS2, 89-C1.x, GSC-1/GSC-2: Reactive support branches, not on the export path; their need is pending load-flow/harmonics study (Note 2).
Station service SS1/89-SS1, control building, NGR-1: Auxiliary loads and neutral grounding; failure of auxiliary power or protection DC that could trip breakers is a common-cause not represented.
Protection spurious trips, grounding-switch interlocks (Note 5), Kirk-key interlocks: Control logic, outside a structural RBD.
Spare position 89-F3.B ('Space'): No circuit installed.

Cut sets

Reference: none

No verdict: nothing was compared with a reference. These are the model's own cut sets.

This model

Minimal cut sets up to order 3. Click an order to show or hide it.

Order 1 (6)

{34.5kV MAIN BUS 1}
{345kV_OH_TIE}
{52-H1}
{89-B1}
{89-H1}
{XFMR T1}

Order 3 (16)

{52-F1, 52-F2, 52-F3}
{52-F1, 52-F2, 89-F3}
{52-F1, 52-F2, 89-F3.A}
{52-F1, 52-F2, MV_CKT_05}
{52-F1, 52-F3, 89-F2}
{52-F1, 89-F2, 89-F3}
{52-F1, 89-F2, 89-F3.A}
{52-F1, 89-F2, MV_CKT_05}
{52-F2, 52-F3, 89-F1}
{52-F2, 89-F1, 89-F3}
{52-F2, 89-F1, 89-F3.A}
{52-F2, 89-F1, MV_CKT_05}
{52-F3, 89-F1, 89-F2}
{89-F1, 89-F2, 89-F3}
{89-F1, 89-F2, 89-F3.A}
{89-F1, 89-F2, MV_CKT_05}

Not on the drawing

node	type	connected to	why
`PV_COLLECTOR`	source	MV_CKT_01, MV_CKT_02, MV_CKT_03, MV_CKT_04, MV_CKT_05	Virtual source feeding the five 34.5 kV MV collector circuits; the arrays are on drawing PV-E.02.01, not this sheet.

← All runs

Sample5_aes.png

draft done r_20261101_165456_a23d · 2026-11-01 16:54:56 UTC

any one of 6 parts failing cuts the supply: none of them has a backupRedundancy: none

Drawing

connections

Page 1

can failperfect connectorless sure (below 0.90)Click a part to review it

Block diagram

Series runs left to right; parallel branches stack.Click a block to review it

About this diagram

Run r_20261101_165456_a23d · from Sample5_aes.png · 22 blocks · 6 single points of failure. Drawn in BlockSim's RBD layout so it can be rebuilt there block for block; this is a picture, not a BlockSim file. The machine-readable export is the Open-PSA fault tree.

MV_CKT_01→89-F1.A

MV_CKT_02→89-F1.B

→52-F1→89-F1

MV_CKT_03→89-F2.A

MV_CKT_04→89-F2.B

→52-F2→89-F2

MV_CKT_05→89-F3.A→52-F3→89-F3

→34.5kV MAIN BUS 1→89-B1→XFMR T1→52-H1→89-H1→345kV_OH_TIE