What is the tolerance for harmonics of the power suppied to the Sepam 20 and 40?
The Sepam S20 et S40 power supply meet the CEI 255-6 standard. This means:
(a) the range of the fundamental (i.e. 1st harmonic) must be between 47.5 and 63 Hz. the peak value including all the harmonics must not exceed 373 V peak.
(b) the rate of harmonics acceptable is 3% of H2, 8% of H3, 20% of H5, 14% of H7, 9% of H11, 8% of H13 , 6% of H17 and 5% of H19
For example, if one were to ask if it would be acceptable to power the sepam using a square wave (with a lot of a harmonics), the answer could be arrived at as follows:
A square wave is composed of the following:
Since the above equation implies a 3rd hamonic of ~33% (limit stated above for the 3rd is 8%) and a 5th harmonic of 20% (limit stated above for the 5th is 14%), it is clear that a square wave would not conform to the specifications that the power supply was designed to. Thus, it would not be a good idea to deliver a square wave supply to the Sepam device.
Last Revised: 8 April 2008
Applies To: Sepam 20 & 40
Original Author: CA
All content © 1992-2008 Schneider Electric
Legacy KB System (APS) Data: RESL192000 V1.0, Originally authored by KBAdPM on 05/23/2008, Last Edited by KBAdPM on 05/23/2008
Related ranges: Sepam series 40, Sepam series 20