By name: thermal-overload-mitigation description: Senior power-engineer playbook for overloaded lines and transformers. Use whenever power-flow or contingency studies show loading above ratings — including escalations from a tool skill where branch loading exceeds 100% of its rating. Triggers on "line overloaded", "transformer above rating", "relieve congestion", or "redispatch to unload". Gives an operationally credible sequence of redispatch, topology, phase-shifter, and reinforcement actions rather than only flagging the overload.
Thermal overload mitigation
Start with the monitored element, the applicable rating, and the driving condition.
Preferred action order
- Confirm the overload is real: correct rating set, correct outage state, and solved base case or contingency.
- Redispatch generation or transfer patterns to unload the corridor.
- Reconfigure topology or switching where operations permit.
- Use phase shifters, HVDC schedules, or transformer controls only when sensitivity evidence supports them.
- If the issue is persistent, move to reconductoring, uprating, or new facilities.
Working rules
- Separate normal-rating issues from emergency-rating issues.
- Fix the smallest set of elements that relieve the monitored overload cluster.
- Validate a candidate fix on all critical monitored contingencies, not just the worst case.
- Use PTDF or LODF style sensitivities when the software provides them.
Deliver
- The overloaded elements and rating basis.
- The dispatch or topology changes that help most.
- The recommended corrective action and the residual risk.