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STPM32TR 数据表(PDF) 79 Page - STMicroelectronics |
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STPM32TR 数据表(HTML) 79 Page - STMicroelectronics |
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79 / 121 page  DS10272 Rev 8 79/121 STPM32, STPM33, STPM34 Application design and calibration 121 With the above external components, the maximum measurable values of RMS voltage and current are: Equation 25 Equation 26 These values are calculated leaving some available room for the input range with the peak value and minimizing modulator distortions. The current resolution value is equal to 4 times LSBIRMS: Equation 27 Example: current transformer case This example shows the correct dimensioning of a meter using a current transformer having the following specification: The dimension of the voltage channel considers the voltage divider resistor values as 770 k and 470 . IMIN Vref calI AI 2 15 k S kint --------------------------------------------------------- A = Table 34. Example 1 design data Parameter Value VN nominal voltage 230 VRMS IN nominal current 5 ARMS IMax maximum current 40 ARMS CP constant pulses 1000 imp/kWh |
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