BEGIN:VCALENDAR VERSION:2.0 PRODID:IEEE vTools.Events//EN CALSCALE:GREGORIAN BEGIN:VTIMEZONE TZID:America/New_York BEGIN:DAYLIGHT DTSTART:20210314T030000 TZOFFSETFROM:-0500 TZOFFSETTO:-0400 RRULE:FREQ=YEARLY;BYDAY=2SU;BYMONTH=3 TZNAME:EDT END:DAYLIGHT BEGIN:STANDARD DTSTART:20211107T010000 TZOFFSETFROM:-0400 TZOFFSETTO:-0500 RRULE:FREQ=YEARLY;BYDAY=1SU;BYMONTH=11 TZNAME:EST END:STANDARD END:VTIMEZONE BEGIN:VEVENT DTSTAMP:20220216T181111Z UID:F2C4E93B-D848-4258-926F-E23CB8DBF7CF DTSTART;TZID=America/New_York:20210526T180000 DTEND;TZID=America/New_York:20210526T190000 DESCRIPTION:In avionics\, widely used standards for power quality include M IL-STD-704 and RTCA DO-160. While both these standards are extremely detai led\, in the area of three-phase power failure\, there are enhancements th at should be considered to capture the full set of failure conditions that can occur in the field or during production tests.\n\nFor example\, in MI L-STD-704\, it is not clear how a phase loss is defined. Although the acco mpanying handbook (MIL-HDBK-704) does clarify the fault definition (as a z ero-volt potential) it is also likely that the fault can be caused by an o pen-circuit condition\, which is not covered. Also not covered is the appl ication of power to the Unit Under Test (UUT) with a pre-existing fault co ndition. DO-160 has a similar issue with the phase fault definition\, but it does cover some cases where the UUT is energized with a pre-existing fa ult. Neither specification covers the loss of the neutral connection for w ye loads.\n\nSuggested updates to both standards are discussed\, along wit h examples describing scenarios where a UUT may pass the DO-160 and/or MIL -STD-704 phase loss methods but fail under conditions likely to occur in t he field or during production test. Design mitigation techniques to preven t damage are also covered.\n\nSpeaker(s): James Colotti\, \n\nFarmingdale\ , New York\, United States\, Virtual: https://events.vtools.ieee.org/m/270 985 LOCATION:Farmingdale\, New York\, United States\, Virtual: https://events.v tools.ieee.org/m/270985 ORGANIZER:colotti@telephonics.com SEQUENCE:23 SUMMARY:Underexplored Three-Phase Power Failure Conditions - CEU/PDH Credit Available URL;VALUE=URI:https://events.vtools.ieee.org/m/270985 X-ALT-DESC:Description: <br /><p class="Default" style="text-align: justify \;"><span style="font-family: 'Arial'\,'sans-serif'\;">In avionics\, widel y used standards for power quality include MIL-STD-704 and RTCA DO-160. Wh ile both these standards are extremely detailed\, in the area of three-pha se power failure\, there are enhancements that should be considered to cap ture the full set of failure conditions that can occur in the field or dur ing production tests.</span></p>\n<p class="Default" style="text-align: ju stify\;"><span style="font-family: 'Arial'\,'sans-serif'\;">For example\, in MIL-STD-704\, it is not clear how a phase loss is defined. Although the accompanying handbook (MIL-HDBK-704) does clarify the fault definition (a s a zero-volt potential) it is also likely that the fault can be caused by an open-circuit condition\, which is not covered. Also not covered is the application of power to the Unit Under Test (UUT) with a pre-existing fau lt condition. DO-160 has a similar issue with the phase fault definition\, but it does cover some cases where the UUT is energized with a pre-existi ng fault. Neither specification covers the loss of the neutral connection for wye loads.</span></p>\n<p class="Default" style="text-align: justify\; "><span style="font-family: 'Arial'\,'sans-serif'\;">Suggested updates to both standards are discussed\, along with examples describing scenarios wh ere a UUT may pass the DO-160 and/or MIL-STD-704 phase loss methods but fa il under conditions likely to occur in the field or during production test . Design mitigation techniques to prevent damage are also covered.</span>< /p>\n<p class="Default" style="text-align: justify\;">&nbsp\;</p> END:VEVENT END:VCALENDAR