TY - GEN
T1 - Effects of nonlinear loads on EMI/RFI filters
AU - Briggs, Stephen J.
AU - Savignon, Daniel J.
AU - Krein, Philip T.
AU - Kim, Michael S.
PY - 1994
Y1 - 1994
N2 - Power feeder electromagnetic interference/radio frequency interference (EMI/RFI) filters are widely used in the Army and industry for filtering unwanted signals on power lines supplying sensitive loads such as computers and communication equipment. Typically these low pass filters are passive circuits designed to attenuate frequencies above 10 kHz. Under 60 Hz sinusoidal conditions, the filters dissipate little power. But when nonlinear loads are present (such as those associated with computers, adjustable speed drives, electronic power supplies, and communication equipment), significant power dissipation can occur within the filters. This can shorten filter lifetime or even lead to complete filter failure. Laboratory testing and mathematical analyses were performed on a selected EMI/RFI filter to: 1) determine its frequency response in the 60 Hz to 3 kHz range, 2) identify the filter components that dissipate the most power when subjected to harmonic currents, and 3) measure filter component temperature rises when harmonic line currents are present. It is shown that power line harmonics, not considered by EMI/RFI filter manufacturers, interact with filter component parasitics and cause considerable power dissipation in the filters.
AB - Power feeder electromagnetic interference/radio frequency interference (EMI/RFI) filters are widely used in the Army and industry for filtering unwanted signals on power lines supplying sensitive loads such as computers and communication equipment. Typically these low pass filters are passive circuits designed to attenuate frequencies above 10 kHz. Under 60 Hz sinusoidal conditions, the filters dissipate little power. But when nonlinear loads are present (such as those associated with computers, adjustable speed drives, electronic power supplies, and communication equipment), significant power dissipation can occur within the filters. This can shorten filter lifetime or even lead to complete filter failure. Laboratory testing and mathematical analyses were performed on a selected EMI/RFI filter to: 1) determine its frequency response in the 60 Hz to 3 kHz range, 2) identify the filter components that dissipate the most power when subjected to harmonic currents, and 3) measure filter component temperature rises when harmonic line currents are present. It is shown that power line harmonics, not considered by EMI/RFI filter manufacturers, interact with filter component parasitics and cause considerable power dissipation in the filters.
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M3 - Conference contribution
AN - SCOPUS:0028016708
SN - 0780318781
T3 - IEEE Conference Record of Industrial and Commercial Power Systems Technical Conference
SP - 91
EP - 95
BT - IEEE Conference Record of Industrial and Commercial Power Systems Technical Conference
A2 - Anon, null
PB - Publ by IEEE
T2 - Proceedings of the 1994 IEEE Industrial and Commercial Power Systems Technical Conference
Y2 - 1 May 1994 through 5 May 1994
ER -