Lesson 08 / 12 · Common upstream assets
Find a single point of failure
What happens to two paths when their common main bus fails?
Predict before you run
Write down your prediction, then change only the input below. In the interactive lesson, compare the starting case with the challenge and export a worksheet to retain your reasoning.
| Input | Starting value | Challenge value |
|---|---|---|
| Main bus available (0 = failed, 1 = available) | 0 | 1 |
Reported quantity: kWh unserved. The live control accepts 0–1.
Worked answer Link to this answer
The common bus outage lasts 600 s. Even with two downstream paths, 1,000 × 600/3,600 = 166.666… kWh is unserved. Keeping the bus available removes the interruption.
| Configuration | Main bus available (0 = failed, 1 = available) | Result (kWh unserved) |
|---|---|---|
| Starting case | 0 | 166.666667 |
| Challenge | 1 | 0 |
Calculated from the same inputs as the interactive lesson. Display rounded to six decimal places; full decimal strings, inputs and energy records are in the downloadable result record.
Reproduce the configuration
| IT demand / simulated duration | 1000 kW / 1800 s |
|---|---|
| Opening battery / energy capacity | 100 kWh / 100 kWh |
| Charging power limit | 100 kW |
| Charge / discharge efficiency | 0.95 / 0.9 |
| Distribution efficiency | 0.95 |
| Generator start delay | 30 s |
Scheduled events
- 300 s: main-bus — asset down
- 900 s: main-bus — asset up
The browser lesson applies its configuration to the normal preset. Open it above, run the starting case, switch to the challenge, and use “Verify against Python” to compare complete results. Use the worksheet export to keep the prediction, completed inputs and answer together.
Sources and verification
- Lesson definitions and input transformations
- Native Python default/challenge checks
- Electrical continuity contract
- Three reference cases, equations and versioned source records
Cite this lesson
Mohammad Rezwan Khan. “Find a single point of failure.” Datacenter Twin Lab, engine 2.0.1. https://khanlab.co.technology/learn/single-point/
Documentation source: 4878472c4d6c166c3dbd81aee292a0a56e89ffff. For a numerical claim, also retain the completed inputs and the result record; the live lesson can be changed by its controls.
Original material by Mohammad Rezwan Khan, engine 2.0.1. Synthetic teaching cases; no facility calibration or independent external reproduction has been established. Annual PUE planning and outage continuity are different calculations. Full scope and evidence.