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STPM32 Datasheet(PDF) 47 Page - STMicroelectronics

Part # STPM32
Description  ASSP for metering applications with up to four independent 24-bit 2nd order sigma-delta ADCs, 4 MHz OSF and 2 embedded PGLNA
PDF  121 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STPM32 Datasheet(HTML) 47 Page - STMicroelectronics

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DS10272 Rev 8
47/121
STPM32, STPM33, STPM34
Theory of operation
121
Results of the calculated quantities are stored in the registers as:
ES1 = primary current channel apparent energy PH1 Apparent Energy[31:0]
S1RMS = primary current channel apparent RMS power PH1 Apparent RMS Power[28:0]
S1vec = primary current channel apparent vectorial power PH1 Apparent Vectorial
Power[28:0]
ES2 = secondary current channel apparent energy PH2 Apparent Energy[31:0]
S2RMS = primary current channel apparent RMS power PH2 Apparent RMS Power[28:0]
S1vec = primary current channel apparent vectorial power PH2 Apparent Vectorial
Power[28:0]
8.4.5
Sign of power
Power measurements are signed calculations. Negative power indicates that energy has
been injected into the grid. DSP_SR1, DSP_SR2 status registers and DSP_EV1, DSP_EV2
registers include sign indication bits for each calculated power.
If the sign of power is negative, the sign bit is set.
SIGN = 0: positive power
SIGN = 1: negative power
In the calculation of the sign, a delay equal to half line period is included.
If the period of signal is T = 20 ms (f = 50 Hz), the applied delay is 10 ms.
Figure 37. Power sign status bit delay
Power
Sign
t < T/2
t = T/2
t = T/2
GIPG2803141118LM



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