Recent Advances in No-Break Power Transfer (NBPT)

No-break power transfer (NBPT) has been used in the 400 Hz aircraft electrical power business for over 30 years. Initially, NBPT was performed on military aircraft or large commercial jets where the interest was to maintain availability of critical equipment during dispatch. Recent-NBPT equipped aircraft such as the 747-400 and MD-11 have demonstrated the desirability of this feature in commercial airline service. Some compatibility issues with solid-state ground power units (GPUs) have also been uncovered.