Doku Basis | Illustrative sample deliverable
Transformer impedance change: impact and closure report
7affected objects
4organizations involved
12 daysto equipment release
3open approvals
Changed fact
- Object
- TX-01 main power transformer
- Parameter
- Positive-sequence impedance
- Prior state
- 10.0% on 240 MVA base, approved design basis Rev. 06
- Proposed state
- 11.5% on 240 MVA base, OEM submittal Rev. B
- Source authority
- OEM technical submittal, pending owner and utility disposition
- Decision deadline
- 12 calendar days before manufacturing release
Impact register
| Impact | Reason | Owner | Status | Closure evidence |
|---|---|---|---|---|
| Short-circuit case | Fault-current results depend on transformer impedance. | Studies engineer | Open | Revised case and signed review |
| Breaker duty | Interrupting duty must be checked against the revised case. | Electrical engineer | Open | Rating disposition |
| Relay settings | Protection coordination references the prior source impedance. | Protection engineer | Review | Approved setting file |
| Utility approval | The facilities approval package references the prior basis. | Interconnection lead | Review | Utility acceptance or no-impact record |
| OEM release | Manufacturing cannot proceed without disposition. | Procurement | At risk | Released submittal |
| FAT milestone | Submittal delay consumes schedule float. | Project controls | Review | Updated integrated schedule |
| Commissioning basis | Installed configuration and approved model must remain aligned. | Commissioning lead | Linked | Updated test prerequisite |
Executive decision
Recommended disposition: Hold manufacturing release until the studies engineer completes the revised fault case and the utility or interconnection lead confirms whether the existing facilities approval remains valid. Preserve the current FAT reservation while the owner evaluates the 12-day decision window.
Audit trail
| Time | Event | Actor |
|---|---|---|
| 09:42 | OEM Rev. B ingested; impedance variance detected. | Doku extraction and procurement confirmation |
| 10:05 | Seven dependencies proposed with source rationale. | Doku Basis |
| 11:10 | Short-circuit and breaker-duty impacts confirmed. | Owner's engineer |
| 14:20 | Utility review assigned; equipment release placed on controlled hold. | Project executive |