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DRAFT, not reviewed. No reference was checked. Have an engineer review it before use.

r_20261029_185904_6b2a

done
drawing
Sample1.png
reference
none
at
2026-10-29T18:59:04Z

Review

If these are right, every cut set is right: the cut sets are computed from the paths and what can fail.

1 · Power reaches the load by these paths

Click a path to light it up on the drawing. Is every part on that route boxed, and nothing extra?

2 · Parts not on the drawing

3 · Assumptions

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Summary

Single points of failure

No single point of failure: no one component failing on its own cuts the supply.

Pairs

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

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

Drawing and graph

block (can fail)perfect connectorin a cut-set difference

Hover a box to see its own connections.

BUS 735 (busbar), confidence 0.95BUS 735DS-735-11A (disconnector), confidence 0.95DS-735-11ACB-735-11 (breaker), confidence 0.95CB-735-11CT-735-11 (ct), confidence 0.95CT-735-11DS-735-11B (disconnector), confidence 0.95DS-735-11BTR-01 (transformer), confidence 0.95TR-01DS-735-12A (disconnector), confidence 0.95DS-735-12ACB-735-12 (breaker), confidence 0.95CB-735-12CT-735-12 (ct), confidence 0.95CT-735-12DS-735-12B (disconnector), confidence 0.95DS-735-12BTR-02 (transformer), confidence 0.95TR-02DS-315-111A (disconnector), confidence 0.95DS-315-111ACB-315-111 (breaker), confidence 0.95CB-315-111CT-315-111 (ct), confidence 0.95CT-315-111DS-315-111B (disconnector), confidence 0.95DS-315-111BDS-315-112A (disconnector), confidence 0.95DS-315-112ACB-315-112 (breaker), confidence 0.95CB-315-112CT-315-112 (ct), confidence 0.95CT-315-112DS-315-112B (disconnector), confidence 0.95DS-315-112BDS-315-121A (disconnector), confidence 0.95DS-315-121ACB-315-121 (breaker), confidence 0.95CB-315-121CT-315-121 (ct), confidence 0.95CT-315-121DS-315-121B (disconnector), confidence 0.95DS-315-121BDS-315-122A (disconnector), confidence 0.95DS-315-122ACB-315-122 (breaker), confidence 0.95CB-315-122CT-315-122 (ct), confidence 0.95CT-315-122DS-315-122B (disconnector), confidence 0.95DS-315-122BBUS 315-A (busbar), confidence 0.95BUS 315-ABUS 315-B (busbar), confidence 0.95BUS 315-B
Page 1

Not on the drawing

nodetypeconnected towhy
315 kV OUTsinkBUS 315-A, BUS 315-BBoth 315 kV buses export to the 315 kV network at the study boundary; a single virtual sink node is needed so 'any path' means power reaches either 315 kV bus. It is a perfect connector and cannot fail.

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 2 (25)
  • {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 (160)
  • {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}

Gaps

  • Sink (BUS 315-A / BUS 315-B) The spec doesn't set the sink. I used a virtual sink that counts power at either 315 kV bus as success. If the study needs a specific bus (e.g., BUS 315-A only) or both buses, the cut sets change.
  • DS-315-112B / DS-315-122B crossings over BUS 315-A I read these as crossing BUS 315-A without connecting to it (crossing symbol), so they connect only to BUS 315-B. Note 2 supports this reading. If it's wrong, the bus assignments change.

Assumptions

Scope: All equipment inside the dashed boundary: BUS 735, two 735 kV transformer bays, TR-01/TR-02, four 315 kV bays, BUS 315-A and BUS 315-B.. Spec: scope is everything inside the dashed study boundary.

Boundary: Source = BUS 735 (fed by the 735 kV lines); sink = virtual 315 kV delivery node tied to both BUS 315-A and BUS 315-B.. The drawing marks the 735 kV lines as the source and shows both 315 kV buses exporting to the 315 kV network at the boundary, so delivery to either 315 kV bus counts as success for the 735→315 kV transformation.

Can fail: breaker, disconnector, ct, transformer. Study spec (CIGRE-138): breakers, disconnectors, CTs and power transformers can fail; busbars and the virtual sink are perfect connectors.

Success: any_path. Study spec: any one source-to-sink path is enough.

Not modelled:

  • 735 kV incoming lines and the 315 kV network beyond the buses: Outside the dashed study boundary.
  • Transformer/bay capacity limits (one path assumed to carry full load): Spec success rule is pure connectivity.
  • Protection, control and auxiliary systems; common-cause and maintenance states: Not shown on the drawing (note 4) and not required by the spec.