About Sample1.png

About this drawing

What it is: Substation single-line diagram, 735/315 kV two-transformer station (DEMO-735/315-SLD-001, Rev D0, synthetic)
What it does: Steps power down from the 735 kV lines through two 1650 MVA transformers (TR-01, TR-02) to two 315 kV buses (BUS 315-A, BUS 315-B) that feed the 315 kV network.
Analyse next: Build a reliability block diagram / minimal cut set analysis of the supply path from BUS 735 to the 315 kV buses, to find single points of failure and the redundancy that the two transformers and the cross-connected 315 kV bays give.
The drawing shows a power path from a source (735 kV lines) to loads (the 315 kV network). The key question is whether at least one path stays intact, which is what an RBD answers. Protection and control are not shown (Note 4), so a fault tree of protection behaviour is not possible from this sheet.

What we still need

315kV NETWORK (sink) / BUS 315-A, BUS 315-B: The drawing doesn't say what has to keep working. I assumed that supply to either 315 kV bus is success. If each bus feeds separate loads that must both stay energised, the sink should be a single bus, or the analysis should cover both buses together. In that case each bus becomes a single point of failure.
TR-01 / TR-02 capacity: The any-path rule assumes one 1650 MVA transformer can carry the full 315 kV load. The load isn't on the drawing, so N-1 adequacy needs to be confirmed.
BUS 735 / 735 kV LINES: BUS 735 is a single bus with no sectionalising, so it is a single point of failure in this model. The number of incoming 735 kV lines and their reliability are off the sheet; the source is treated as perfect.
Protection/control (Note 4): Protection, breaker-failure and auxiliary systems aren't shown. Fault propagation, such as a bay fault cleared by the bus protection, is not modelled.

How this result was made

AI readingexactyou

Read the drawing30 parts found on Sample1.png, 1 added · reading confidence 0.95
Connect the parts33 connections, from 735kV LINES to 315kV NETWORK, plus what can fail and the boundary
Find every path4 ways power reaches the load
Work out the cut sets299 cut sets: one part failing cuts the supply: it has no backup; 26 more pairs cut it only if both fail together. 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 735 kV LINES (source) to to 315 kV network (both buses), counting failures of breaker, disconnector, ct, transformer, busbar.

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

Start and end: Source = 735 kV lines feeding BUS 735 (treated as perfect). Sink = a virtual '315 kV network' node fed by both BUS 315-A and BUS 315-B.. These are the points where power enters and leaves the dashed study boundary. Both buses leave the sheet 'to 315 kV network', so delivery through either bus counts as success.
Scope: The 735 to 315 kV transformation inside the red dashed study boundary: BUS 735, both transformer bays (HV disconnectors, breakers and CTs, TR-01 and TR-02), the four 315 kV bays, and BUS 315-A and BUS 315-B.. The drawing's dashed boundary note says this is the study boundary and that items outside it are out of scope.
What can fail: These are the in-boundary primary equipment items in series in the power path; any one of them failing open or faulting interrupts its branch. The source (735 kV lines) and the virtual sink are boundary terminals and are treated as perfect.

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

2. These 1 part each take it down alone

Click one to light it up on both views.

BUS 735

What could change this list

Couldn't read 315kV NETWORK (sink) / BUS 315-A, BUS 315-B: The drawing doesn't say what has to keep working. I assumed that supply to either 315 kV bus is success. If each bus feeds separate loads that must both stay energised, the sink should be a single bus, or the analysis should cover both buses together. In that case each bus becomes a single point of failure.
Couldn't read TR-01 / TR-02 capacity: The any-path rule assumes one 1650 MVA transformer can carry the full 315 kV load. The load isn't on the drawing, so N-1 adequacy needs to be confirmed.
Couldn't read BUS 735 / 735 kV LINES: BUS 735 is a single bus with no sectionalising, so it is a single point of failure in this model. The number of incoming 735 kV lines and their reliability are off the sheet; the source is treated as perfect.
Couldn't read Protection/control (Note 4): Protection, breaker-failure and auxiliary systems aren't shown. Fault propagation, such as a bay fault cleared by the bus protection, is not modelled.
Left out: Protection, control and auxiliary systems (relays, DC supply, trip circuits). Not shown on the drawing (Note 4); CTs are modelled only as series primary elements.
Left out: Capacity and N-1 loading limits of the transformers and buses. An any-path RBD is connectivity only; the transformer ratings and the 315 kV load are not given.
Left out: Fault propagation and breaker failure to clear (a bus fault taking out adjacent equipment). An RBD treats failures as independent opens; protection coordination is not on the sheet.
Left out: Common-cause failures and maintenance outages. No data on the drawing; all blocks are treated as independent.
Left out: Junction points at the transformer LV leads. These are connection dots, not equipment; they are treated as perfect.

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 4 paths. Click one to light it up.

Path 1 BUS 735 → DS-735-11A → CB-735-11 → CT-735-11 → DS-735-11B → TR-01 → DS-315-111A → CB-315-111 → CT-315-111 → DS-315-111B → BUS 315-A
Path 2 BUS 735 → DS-735-12A → CB-735-12 → CT-735-12 → DS-735-12B → TR-02 → DS-315-121A → CB-315-121 → CT-315-121 → DS-315-121B → BUS 315-A
Path 3 BUS 735 → DS-735-11A → CB-735-11 → CT-735-11 → DS-735-11B → TR-01 → DS-315-112A → CB-315-112 → CT-315-112 → DS-315-112B → BUS 315-B
Path 4 BUS 735 → DS-735-12A → CB-735-12 → CT-735-12 → DS-735-12B → TR-02 → DS-315-122A → CB-315-122 → CT-315-122 → DS-315-122B → BUS 315-B

Parts not on the drawing: 315kV NETWORK.

Summary

Single points of failure

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

{BUS 735}

Pairs

26 pairs: the supply is lost only if both components of a pair fail together.

{BUS 315-A, BUS 315-B}
{CB-735-11, CB-735-12}
{CB-735-11, CT-735-12}
{CB-735-11, DS-735-12A}
{CB-735-11, DS-735-12B}
{CB-735-11, TR-02}
{CB-735-12, CT-735-11}
{CB-735-12, DS-735-11A}
{CB-735-12, DS-735-11B}
{CB-735-12, TR-01}
{CT-735-11, CT-735-12}
{CT-735-11, DS-735-12A}
{CT-735-11, DS-735-12B}
{CT-735-11, TR-02}
{CT-735-12, DS-735-11A}
{CT-735-12, DS-735-11B}
{CT-735-12, TR-01}
{DS-735-11A, DS-735-12A}
{DS-735-11A, DS-735-12B}
{DS-735-11A, TR-02}
{DS-735-11B, DS-735-12A}
{DS-735-11B, DS-735-12B}
{DS-735-11B, TR-02}
{DS-735-12A, TR-01}
{DS-735-12B, TR-01}
{TR-01, TR-02}

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

Assumptions

Scope: The 735 to 315 kV transformation inside the red dashed study boundary: BUS 735, both transformer bays (HV disconnectors, breakers and CTs, TR-01 and TR-02), the four 315 kV bays, and BUS 315-A and BUS 315-B.. The drawing's dashed boundary note says this is the study boundary and that items outside it are out of scope.

Boundary: Source = 735 kV lines feeding BUS 735 (treated as perfect). Sink = a virtual '315 kV network' node fed by both BUS 315-A and BUS 315-B.. These are the points where power enters and leaves the dashed study boundary. Both buses leave the sheet 'to 315 kV network', so delivery through either bus counts as success.

Can fail: breaker, disconnector, ct, transformer, busbar. These are the in-boundary primary equipment items in series in the power path; any one of them failing open or faulting interrupts its branch. The source (735 kV lines) and the virtual sink are boundary terminals and are treated as perfect.

Success: any_path. Note 1: everything is normally closed, and the station supplies the 315 kV network if at least one intact path connects BUS 735 to either 315 kV bus. Each 1650 MVA transformer is assumed able to carry the station load alone (capacity is not checked).

Not modelled:

Protection, control and auxiliary systems (relays, DC supply, trip circuits): Not shown on the drawing (Note 4); CTs are modelled only as series primary elements.
Capacity and N-1 loading limits of the transformers and buses: An any-path RBD is connectivity only; the transformer ratings and the 315 kV load are not given.
Fault propagation and breaker failure to clear (a bus fault taking out adjacent equipment): An RBD treats failures as independent opens; protection coordination is not on the sheet.
Common-cause failures and maintenance outages: No data on the drawing; all blocks are treated as independent.
Junction points at the transformer LV leads: These are connection dots, not equipment; they are treated as perfect.

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 (1)

{BUS 735}

Order 2 (26)

{BUS 315-A, BUS 315-B}
{CB-735-11, CB-735-12}
{CB-735-11, CT-735-12}
{CB-735-11, DS-735-12A}
{CB-735-11, DS-735-12B}
{CB-735-11, TR-02}
{CB-735-12, CT-735-11}
{CB-735-12, DS-735-11A}
{CB-735-12, DS-735-11B}
{CB-735-12, TR-01}
{CT-735-11, CT-735-12}
{CT-735-11, DS-735-12A}
{CT-735-11, DS-735-12B}
{CT-735-11, TR-02}
{CT-735-12, DS-735-11A}
{CT-735-12, DS-735-11B}
{CT-735-12, TR-01}
{DS-735-11A, DS-735-12A}
{DS-735-11A, DS-735-12B}
{DS-735-11A, TR-02}
{DS-735-11B, DS-735-12A}
{DS-735-11B, DS-735-12B}
{DS-735-11B, TR-02}
{DS-735-12A, TR-01}
{DS-735-12B, TR-01}
{TR-01, TR-02}

Order 3 (272)

{BUS 315-A, CB-315-112, CB-315-122}
{BUS 315-A, CB-315-112, CB-735-12}
{BUS 315-A, CB-315-112, CT-315-122}
{BUS 315-A, CB-315-112, CT-735-12}
{BUS 315-A, CB-315-112, DS-315-122A}
{BUS 315-A, CB-315-112, DS-315-122B}
{BUS 315-A, CB-315-112, DS-735-12A}
{BUS 315-A, CB-315-112, DS-735-12B}
{BUS 315-A, CB-315-112, TR-02}
{BUS 315-A, CB-315-122, CB-735-11}
{BUS 315-A, CB-315-122, CT-315-112}
{BUS 315-A, CB-315-122, CT-735-11}
{BUS 315-A, CB-315-122, DS-315-112A}
{BUS 315-A, CB-315-122, DS-315-112B}
{BUS 315-A, CB-315-122, DS-735-11A}
{BUS 315-A, CB-315-122, DS-735-11B}
{BUS 315-A, CB-315-122, TR-01}
{BUS 315-A, CB-735-11, CT-315-122}
{BUS 315-A, CB-735-11, DS-315-122A}
{BUS 315-A, CB-735-11, DS-315-122B}
{BUS 315-A, CB-735-12, CT-315-112}
{BUS 315-A, CB-735-12, DS-315-112A}
{BUS 315-A, CB-735-12, DS-315-112B}
{BUS 315-A, CT-315-112, CT-315-122}
{BUS 315-A, CT-315-112, CT-735-12}
{BUS 315-A, CT-315-112, DS-315-122A}
{BUS 315-A, CT-315-112, DS-315-122B}
{BUS 315-A, CT-315-112, DS-735-12A}
{BUS 315-A, CT-315-112, DS-735-12B}
{BUS 315-A, CT-315-112, TR-02}
{BUS 315-A, CT-315-122, CT-735-11}
{BUS 315-A, CT-315-122, DS-315-112A}
{BUS 315-A, CT-315-122, DS-315-112B}
{BUS 315-A, CT-315-122, DS-735-11A}
{BUS 315-A, CT-315-122, DS-735-11B}
{BUS 315-A, CT-315-122, TR-01}
{BUS 315-A, CT-735-11, DS-315-122A}
{BUS 315-A, CT-735-11, DS-315-122B}
{BUS 315-A, CT-735-12, DS-315-112A}
{BUS 315-A, CT-735-12, DS-315-112B}
{BUS 315-A, DS-315-112A, DS-315-122A}
{BUS 315-A, DS-315-112A, DS-315-122B}
{BUS 315-A, DS-315-112A, DS-735-12A}
{BUS 315-A, DS-315-112A, DS-735-12B}
{BUS 315-A, DS-315-112A, TR-02}
{BUS 315-A, DS-315-112B, DS-315-122A}
{BUS 315-A, DS-315-112B, DS-315-122B}
{BUS 315-A, DS-315-112B, DS-735-12A}
{BUS 315-A, DS-315-112B, DS-735-12B}
{BUS 315-A, DS-315-112B, TR-02}
{BUS 315-A, DS-315-122A, DS-735-11A}
{BUS 315-A, DS-315-122A, DS-735-11B}
{BUS 315-A, DS-315-122A, TR-01}
{BUS 315-A, DS-315-122B, DS-735-11A}
{BUS 315-A, DS-315-122B, DS-735-11B}
{BUS 315-A, DS-315-122B, TR-01}
{BUS 315-B, CB-315-111, CB-315-121}
{BUS 315-B, CB-315-111, CB-735-12}
{BUS 315-B, CB-315-111, CT-315-121}
{BUS 315-B, CB-315-111, CT-735-12}
{BUS 315-B, CB-315-111, DS-315-121A}
{BUS 315-B, CB-315-111, DS-315-121B}
{BUS 315-B, CB-315-111, DS-735-12A}
{BUS 315-B, CB-315-111, DS-735-12B}
{BUS 315-B, CB-315-111, TR-02}
{BUS 315-B, CB-315-121, CB-735-11}
{BUS 315-B, CB-315-121, CT-315-111}
{BUS 315-B, CB-315-121, CT-735-11}
{BUS 315-B, CB-315-121, DS-315-111A}
{BUS 315-B, CB-315-121, DS-315-111B}
{BUS 315-B, CB-315-121, DS-735-11A}
{BUS 315-B, CB-315-121, DS-735-11B}
{BUS 315-B, CB-315-121, TR-01}
{BUS 315-B, CB-735-11, CT-315-121}
{BUS 315-B, CB-735-11, DS-315-121A}
{BUS 315-B, CB-735-11, DS-315-121B}
{BUS 315-B, CB-735-12, CT-315-111}
{BUS 315-B, CB-735-12, DS-315-111A}
{BUS 315-B, CB-735-12, DS-315-111B}
{BUS 315-B, CT-315-111, CT-315-121}
{BUS 315-B, CT-315-111, CT-735-12}
{BUS 315-B, CT-315-111, DS-315-121A}
{BUS 315-B, CT-315-111, DS-315-121B}
{BUS 315-B, CT-315-111, DS-735-12A}
{BUS 315-B, CT-315-111, DS-735-12B}
{BUS 315-B, CT-315-111, TR-02}
{BUS 315-B, CT-315-121, CT-735-11}
{BUS 315-B, CT-315-121, DS-315-111A}
{BUS 315-B, CT-315-121, DS-315-111B}
{BUS 315-B, CT-315-121, DS-735-11A}
{BUS 315-B, CT-315-121, DS-735-11B}
{BUS 315-B, CT-315-121, TR-01}
{BUS 315-B, CT-735-11, DS-315-121A}
{BUS 315-B, CT-735-11, DS-315-121B}
{BUS 315-B, CT-735-12, DS-315-111A}
{BUS 315-B, CT-735-12, DS-315-111B}
{BUS 315-B, DS-315-111A, DS-315-121A}
{BUS 315-B, DS-315-111A, DS-315-121B}
{BUS 315-B, DS-315-111A, DS-735-12A}
{BUS 315-B, DS-315-111A, DS-735-12B}
{BUS 315-B, DS-315-111A, TR-02}
{BUS 315-B, DS-315-111B, DS-315-121A}
{BUS 315-B, DS-315-111B, DS-315-121B}
{BUS 315-B, DS-315-111B, DS-735-12A}
{BUS 315-B, DS-315-111B, DS-735-12B}
{BUS 315-B, DS-315-111B, TR-02}
{BUS 315-B, DS-315-121A, DS-735-11A}
{BUS 315-B, DS-315-121A, DS-735-11B}
{BUS 315-B, DS-315-121A, TR-01}
{BUS 315-B, DS-315-121B, DS-735-11A}
{BUS 315-B, DS-315-121B, DS-735-11B}
{BUS 315-B, DS-315-121B, TR-01}
{CB-315-111, CB-315-112, CB-735-12}
{CB-315-111, CB-315-112, CT-735-12}
{CB-315-111, CB-315-112, DS-735-12A}
{CB-315-111, CB-315-112, DS-735-12B}
{CB-315-111, CB-315-112, TR-02}
{CB-315-111, CB-735-12, CT-315-112}
{CB-315-111, CB-735-12, DS-315-112A}
{CB-315-111, CB-735-12, DS-315-112B}
{CB-315-111, CT-315-112, CT-735-12}
{CB-315-111, CT-315-112, DS-735-12A}
{CB-315-111, CT-315-112, DS-735-12B}
{CB-315-111, CT-315-112, TR-02}
{CB-315-111, CT-735-12, DS-315-112A}
{CB-315-111, CT-735-12, DS-315-112B}
{CB-315-111, DS-315-112A, DS-735-12A}
{CB-315-111, DS-315-112A, DS-735-12B}
{CB-315-111, DS-315-112A, TR-02}
{CB-315-111, DS-315-112B, DS-735-12A}
{CB-315-111, DS-315-112B, DS-735-12B}
{CB-315-111, DS-315-112B, TR-02}
{CB-315-112, CB-735-12, CT-315-111}
{CB-315-112, CB-735-12, DS-315-111A}
{CB-315-112, CB-735-12, DS-315-111B}
{CB-315-112, CT-315-111, CT-735-12}
{CB-315-112, CT-315-111, DS-735-12A}
{CB-315-112, CT-315-111, DS-735-12B}
{CB-315-112, CT-315-111, TR-02}
{CB-315-112, CT-735-12, DS-315-111A}
{CB-315-112, CT-735-12, DS-315-111B}
{CB-315-112, DS-315-111A, DS-735-12A}
{CB-315-112, DS-315-111A, DS-735-12B}
{CB-315-112, DS-315-111A, TR-02}
{CB-315-112, DS-315-111B, DS-735-12A}
{CB-315-112, DS-315-111B, DS-735-12B}
{CB-315-112, DS-315-111B, TR-02}
{CB-315-121, CB-315-122, CB-735-11}
{CB-315-121, CB-315-122, CT-735-11}
{CB-315-121, CB-315-122, DS-735-11A}
{CB-315-121, CB-315-122, DS-735-11B}
{CB-315-121, CB-315-122, TR-01}
{CB-315-121, CB-735-11, CT-315-122}
{CB-315-121, CB-735-11, DS-315-122A}
{CB-315-121, CB-735-11, DS-315-122B}
{CB-315-121, CT-315-122, CT-735-11}
{CB-315-121, CT-315-122, DS-735-11A}
{CB-315-121, CT-315-122, DS-735-11B}
{CB-315-121, CT-315-122, TR-01}
{CB-315-121, CT-735-11, DS-315-122A}
{CB-315-121, CT-735-11, DS-315-122B}
{CB-315-121, DS-315-122A, DS-735-11A}
{CB-315-121, DS-315-122A, DS-735-11B}
{CB-315-121, DS-315-122A, TR-01}
{CB-315-121, DS-315-122B, DS-735-11A}
{CB-315-121, DS-315-122B, DS-735-11B}
{CB-315-121, DS-315-122B, TR-01}
{CB-315-122, CB-735-11, CT-315-121}
{CB-315-122, CB-735-11, DS-315-121A}
{CB-315-122, CB-735-11, DS-315-121B}
{CB-315-122, CT-315-121, CT-735-11}
{CB-315-122, CT-315-121, DS-735-11A}
{CB-315-122, CT-315-121, DS-735-11B}
{CB-315-122, CT-315-121, TR-01}
{CB-315-122, CT-735-11, DS-315-121A}
{CB-315-122, CT-735-11, DS-315-121B}
{CB-315-122, DS-315-121A, DS-735-11A}
{CB-315-122, DS-315-121A, DS-735-11B}
{CB-315-122, DS-315-121A, TR-01}
{CB-315-122, DS-315-121B, DS-735-11A}
{CB-315-122, DS-315-121B, DS-735-11B}
{CB-315-122, DS-315-121B, TR-01}
{CB-735-11, CT-315-121, CT-315-122}
{CB-735-11, CT-315-121, DS-315-122A}
{CB-735-11, CT-315-121, DS-315-122B}
{CB-735-11, CT-315-122, DS-315-121A}
{CB-735-11, CT-315-122, DS-315-121B}
{CB-735-11, DS-315-121A, DS-315-122A}
{CB-735-11, DS-315-121A, DS-315-122B}
{CB-735-11, DS-315-121B, DS-315-122A}
{CB-735-11, DS-315-121B, DS-315-122B}
{CB-735-12, CT-315-111, CT-315-112}
{CB-735-12, CT-315-111, DS-315-112A}
{CB-735-12, CT-315-111, DS-315-112B}
{CB-735-12, CT-315-112, DS-315-111A}
{CB-735-12, CT-315-112, DS-315-111B}
{CB-735-12, DS-315-111A, DS-315-112A}
{CB-735-12, DS-315-111A, DS-315-112B}
{CB-735-12, DS-315-111B, DS-315-112A}
{CB-735-12, DS-315-111B, DS-315-112B}
{CT-315-111, CT-315-112, CT-735-12}
{CT-315-111, CT-315-112, DS-735-12A}
{CT-315-111, CT-315-112, DS-735-12B}
{CT-315-111, CT-315-112, TR-02}
{CT-315-111, CT-735-12, DS-315-112A}
{CT-315-111, CT-735-12, DS-315-112B}
{CT-315-111, DS-315-112A, DS-735-12A}
{CT-315-111, DS-315-112A, DS-735-12B}
{CT-315-111, DS-315-112A, TR-02}
{CT-315-111, DS-315-112B, DS-735-12A}
{CT-315-111, DS-315-112B, DS-735-12B}
{CT-315-111, DS-315-112B, TR-02}
{CT-315-112, CT-735-12, DS-315-111A}
{CT-315-112, CT-735-12, DS-315-111B}
{CT-315-112, DS-315-111A, DS-735-12A}
{CT-315-112, DS-315-111A, DS-735-12B}
{CT-315-112, DS-315-111A, TR-02}
{CT-315-112, DS-315-111B, DS-735-12A}
{CT-315-112, DS-315-111B, DS-735-12B}
{CT-315-112, DS-315-111B, TR-02}
{CT-315-121, CT-315-122, CT-735-11}
{CT-315-121, CT-315-122, DS-735-11A}
{CT-315-121, CT-315-122, DS-735-11B}
{CT-315-121, CT-315-122, TR-01}
{CT-315-121, CT-735-11, DS-315-122A}
{CT-315-121, CT-735-11, DS-315-122B}
{CT-315-121, DS-315-122A, DS-735-11A}
{CT-315-121, DS-315-122A, DS-735-11B}
{CT-315-121, DS-315-122A, TR-01}
{CT-315-121, DS-315-122B, DS-735-11A}
{CT-315-121, DS-315-122B, DS-735-11B}
{CT-315-121, DS-315-122B, TR-01}
{CT-315-122, CT-735-11, DS-315-121A}
{CT-315-122, CT-735-11, DS-315-121B}
{CT-315-122, DS-315-121A, DS-735-11A}
{CT-315-122, DS-315-121A, DS-735-11B}
{CT-315-122, DS-315-121A, TR-01}
{CT-315-122, DS-315-121B, DS-735-11A}
{CT-315-122, DS-315-121B, DS-735-11B}
{CT-315-122, DS-315-121B, TR-01}
{CT-735-11, DS-315-121A, DS-315-122A}
{CT-735-11, DS-315-121A, DS-315-122B}
{CT-735-11, DS-315-121B, DS-315-122A}
{CT-735-11, DS-315-121B, DS-315-122B}
{CT-735-12, DS-315-111A, DS-315-112A}
{CT-735-12, DS-315-111A, DS-315-112B}
{CT-735-12, DS-315-111B, DS-315-112A}
{CT-735-12, DS-315-111B, DS-315-112B}
{DS-315-111A, DS-315-112A, DS-735-12A}
{DS-315-111A, DS-315-112A, DS-735-12B}
{DS-315-111A, DS-315-112A, TR-02}
{DS-315-111A, DS-315-112B, DS-735-12A}
{DS-315-111A, DS-315-112B, DS-735-12B}
{DS-315-111A, DS-315-112B, TR-02}
{DS-315-111B, DS-315-112A, DS-735-12A}
{DS-315-111B, DS-315-112A, DS-735-12B}
{DS-315-111B, DS-315-112A, TR-02}
{DS-315-111B, DS-315-112B, DS-735-12A}
{DS-315-111B, DS-315-112B, DS-735-12B}
{DS-315-111B, DS-315-112B, TR-02}
{DS-315-121A, DS-315-122A, DS-735-11A}
{DS-315-121A, DS-315-122A, DS-735-11B}
{DS-315-121A, DS-315-122A, TR-01}
{DS-315-121A, DS-315-122B, DS-735-11A}
{DS-315-121A, DS-315-122B, DS-735-11B}
{DS-315-121A, DS-315-122B, TR-01}
{DS-315-121B, DS-315-122A, DS-735-11A}
{DS-315-121B, DS-315-122A, DS-735-11B}
{DS-315-121B, DS-315-122A, TR-01}
{DS-315-121B, DS-315-122B, DS-735-11A}
{DS-315-121B, DS-315-122B, DS-735-11B}
{DS-315-121B, DS-315-122B, TR-01}

Not on the drawing

node	type	connected to	why
`315kV NETWORK`	sink	BUS 315-A, BUS 315-B	Virtual sink: both 315 kV buses leave the sheet 'to 315 kV network'; success taken as power delivered to that network via either bus.

← All runs

Sample1.png

draft done r_20261101_165405_2a5b · 2026-11-01 16:54:05 UTC

one part failing cuts the supply: it has no backup; 26 more pairs cut it only if both fail togetherRedundancy: none

Drawing

connections

Page 1

can failperfect connectorClick 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_165405_2a5b · from Sample1.png · 29 blocks · 1 single point 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.

BUS 735→DS-735-11A→CB-735-11→CT-735-11→DS-735-11B→TR-01→DS-315-111A→CB-315-111→CT-315-111→DS-315-111B→BUS 315-A

BUS 735→DS-735-12A→CB-735-12→CT-735-12→DS-735-12B→TR-02→DS-315-121A→CB-315-121→CT-315-121→DS-315-121B→BUS 315-A

BUS 735→DS-735-11A→CB-735-11→CT-735-11→DS-735-11B→TR-01→DS-315-112A→CB-315-112→CT-315-112→DS-315-112B→BUS 315-B

BUS 735→DS-735-12A→CB-735-12→CT-735-12→DS-735-12B→TR-02→DS-315-122A→CB-315-122→CT-315-122→DS-315-122B→BUS 315-B