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SA2005 Datasheet(PDF) 11 Page - Sames |
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SA2005 Datasheet(HTML) 11 Page - Sames |
11 / 16 page sames sames SA2005P 11/16 http://www.sames.co.za Recalculate the rated conditions Krx = 642 000 / Rated volt / Rated current / 6400 x 3600 x 1000 / 512 x (1 + %MinError / 100 ) Krx = 642 000 / 230 / 80 / 6400 x 3600 x 1000 / 512 x 1.015 Krx = 38.9077 Kr = 38 - 1 = 37 The 37 are stored in the rated register. The channel balance values are adjusted to make provision for the rounding error. Gain = ((Krx - Kr +1 ) / Krx ) x 100 Gain = (( 38.9077 - 38 ) / 38.9077 ) x 100 Gain = 2.33 The channel balance pre-devider value must be recalculated. (BMIN will be the lowest %error value, in this case 1.5%, CHB1, CHB2 and CHB3 are the individual phase %errors measured. Cb1 = (CHB1 - CBMIN + Gain ) x 256 / 100 Cb1 = (1.5 - 1.5 + 2.33 ) x 256 / 100 = 5.97 =5 Cb2 = (CHB2 - CBMIN + Gain ) x 256 / 100 Cb2 = ( 5.2 - 1.5 + 2.33 ) x 256 / 100 = 15.43 = 15 Cb3 = (CHB3 - CBMIN + Gain ) x 256 / 100 Cb3 = (3.2 - 1.5 + 2.33 ) x 256 / 100 = 10.316 = 10 Store the calculated values in the EEPROM and the meter is calibrated. |
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