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SA2005PPA Datasheet(PDF) 10 Page - Sames |
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SA2005PPA Datasheet(HTML) 10 Page - Sames |
10 / 16 page sames sames SA2005P 10/16 http://www.sames.co.za D16[2] Counter Resolution 0 0 0 0 1 1 1 1 Total sum all three phases Only phase 1 measurement Only phase 2 measurement Only phase 3 measurement Absolute sum of all three phases Only phase 1 measurement Only phase 2 measurement Only phase 3 measurement D16[1] 0 0 1 1 0 0 1 1 D16[0] 0 1 0 1 0 1 0 1 Example of calculating rated conditions and channel balance values Meter rating = 80A / 230V (The SA2005P only uses integer values) Calculate the rated conditions: Krx=642 000/Rated volt/Rated current/6400x3600x1000/512 Krx = 642 000/230/80/6400x3600x1000/512 Krx = 38.3327 Krx = 38 (round Krx) - convert to integer Kr = 38 - 1 = 37 The value 37 is stored in the rated register (Kr). Calculate the Channel balance values: During the rated conditions calculation the rated condition register was rounded and any rounding errors is now taken into account: Gain = ((Krx - Kr+1 ) / Krx) x 100 Gain = ((38.3327 - 38) / 38.337) x 100 Gain = 0.8679 The real channel balance errors still need to be measured so CHB1,CHB2, CHB3 and CBMIN are set to 0 for all phases. Calculate the Pre-divider values: Cb1 = (CHB1 - CBMIN + Gain ) x 256 / 100 Cb1 = (0% - 0% + Gain ) x 256 / 100 Cb1 = Gain x 256 / 100 Cb1 = 0.8679 x 256 / 100 Cb1 =2.2218 Convert to integer Cb1 = 2 At this stage all three channels will be set with the same values, Cb1= Cb2= Cb3. Store the calculated values in the EEPROM. Ensure that the SA2005P reload’s its registers from the EEPROM by means of the reload pin (RLOAD) or power down the meter and power up again. The meter is now set up with the correct register values but not yet calibrated. The following example shows how to calibrate the meter Use the rated conditions divider value and the channel balance values calculated above and program the EEPROM. Set the programmable adder for a single phase to be measured. Measure the %error for each individual phase without changing any of the calibration constants. %Error=(Measured Energy-Real Energy)/Real Energyx100 The %Error will be worked back into the calculations above. For the example we will assume a 1.5%, 5.2%, and 3.2% for the three individual phases. The rated conditions value is recalculated relative to the phase with the lowest error. Phase 1 has the lowest error so 1.5% = MinError; Programmable adder mode (SUM) The SA2005P can be programmed to sum the energy measurement as follows: Total sum This represents the total sum of the energy measured on all three phases flowing through the current sensors. Negative energy flow is taken into consideration. Energy = Energy phase 1 + Energy Phase 2 + Energy Phase 3 Absolute sum This represents the sum of the energy measured on all three phases, regardless of the direction of energy flow through the current sensors. Power = abs (Energy phase 1) + abs (Energy phase 2) + abs (Energy phase 3) During calibration the device may be programmed to use only a specific phase for energy measurement. This can be used for channel balancing. |
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