Also included are brief discussions on Common mode noise and Differential noise, the difference between the two and the proper filtering of each.ĭesigning to Survive a Direct Lightning Strike Is also discussed using the source to load ratio at a specificįrequency to determine the effective impedance damping needed to meet EMI Loss Calculations are covered along with the general equations for determining losses based on relationships of the Source to the Load. Also covered is an overview of IEEE standards for surge protection, as well as applicable safety standards. This session discusses the origins of how surges occur and the methods to mitigate these transients from sensitive electronic equipment. The threat of equipment disruption and damage from transient surges is very real and can have dire consequences on the delivery of electricity to residential, commercial and industrial users. The Smart Grid is an all encompassing term in today’s power distribution industry. Design mitigation techniques to prevent damage are included in these examples. Neither specification covers the loss of the neutral connection for wye loads.Įxamples are covered where a UUT may pass the DO-160 and/or MIL-STD-704 phase failure methods but be damaged under conditions likely to occur in the field or during production test. 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 fault. Also not covered is the application of power to the Unit Under Test (UUT) with a pre-existing fault condition. Although the accompanying handbook (MIL-HDBK-704) does clarify the fault definition (as a zero-volt potential) it is also likely that the fault can be caused by an open-circuit condition, which is not covered. For example, in MIL-STD-704, it is not clear how a phase loss is defined.

While both these standards are extremely detailed, there are areas where clarifications and additional conditions can help capture a more comprehensive suite of three-phase power failure modes that can occur in the field or during production tests. In avionics, widely used standards for power quality include MIL-STD-704 and RTCA DO-160. Underexplored Three-Phase Power Failure Conditions The EMC Society also provides a forum for sharing ideas and industry information. The Electromagnetic Compatibility Society (EMC-27) provides a networking environment for engineers involved in EMC test and/or design efforts. Electromagnetic Compatibility (EMC) Society

Kemet origins of galvanic skin response