Skip to content

Outage Transfer Distribution Factor

A PTDF applied to the post-contingency configuration after one or more facilities are removed from service.

Definition by NERC

Source: 1

In the post-contingency configuration of a system under study, the electric Power Transfer Distribution Factor (PTDF) with one or more system Facilities removed from service (outaged).

Definition by PowerWorld

Source: 2 (Sensitivities > Line Outage Distribution Factors > Line Outage Distribution Factors (LODFs))

An OTDF is similar to PTDF, except an OTDF provides a linearized approximation of the post-outage change in flow on a transmission line in response to a transaction between the Seller and the Buyer. The OTDF value is a function of PTDF values and LODF values.

Calculations can be found in the source reference.

Last modified: 2025-06-19

← Oscillation · Participation Factors →

  1. NERC (2025). Glossary of Terms Used in NERC Reliability Standards. https://www.nerc.com/pa/Stand/Glossary%20of%20Terms/Glossary_of_Terms.pdf ↩

  2. PowerWorld (2025). PowerWorld Manual. http://www.powerworld.com/WebHelp ↩