SA9604APA Ver la hoja de datos (PDF) - South African Micro Electronic Systems

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SA9604APA

THREE PHASE BIDIRECTIONAL POWER/ENERGY METERING IC WITH SERIAL SPI INTERFACE

South African Micro Electronic Systems 

SA9604A

Example:

V = 230V

I = 80A

Active Power = 230V x 80A x (n/t)/640000

Reactive Power = 230V x 80A (n/t)/(640000 x 2)/Pi)

n=

Difference in register values between successive reads (delta

value)

t=

Time difference between successive reads (in seconds)

To calculate the measured voltage, the following formula is applied:

V = measured

V *n

940 000 * t

Where V =

t=

n=

Rated Voltage

Time difference between successive reads

Difference in register values between

successive reads

The Voltage calculated is the average voltage. The voltage measurement will give

an accuracy of better than 1% for a voltage range of 50% to 115% of the rated mains

voltage if the voltage is a pure sine wave.

The mains frequency may be calculated as follows:

Frequency =

Crystal frequency

Register Value * 2

7. Calibration

For accurate results we would recommend the following software calibration

procedure:

7.1 Active energy

Establish a calibration factor for active energy (Ka) at pf close to 1.

Active Measured = Active_Register_Value x Ka

14/20

sames

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