ADS131M08IPBSR datasheet(101/118 Pages) TI2

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fed to the design for cumulative active energy testing. Based on the error from the active energy output pulse,

several plots of active energy percentage error versus current were created for 0°, 60°, and –60° phase shifts.

For the cumulative reactive energy error testing, a similar process was followed except that 30°, 60°, –30°, and –

60° phase shifts were used, and the cumulative reactive energy error was plotted instead of the cumulative

active energy error. In the cumulative active and reactive energy testing, the sum of the energy reading of each

phase was tested for accuracy.

In addition to testing active energy by varying current, active energy was also tested by varying the RMS voltage

from 240 V to 15 V and measuring the active energy percentage error.

The front-end was calibrated before obtaining the following results. The active energy results are within 0.1% at

0° phase shift. At 60° and –60° phase shift, which is allowed to have relaxed accuracy in electricity meter

standards, the trend where the results deviate at higher currents is from the CT phase shift varying across

current.

Table 9-3 shows the cumulative active energy accuracy results with changing voltage. Table 9-4 shows the

cumulative active energy results with varying current. Figure 9-8 shows a plot of the values in Table 9-4.

Table 9-3. Cumulative Phase Active Energy % Error

Versus Voltage, Two-Voltage Mode

VOLTAGE (V)

% ERROR

240

0.0353

120

0.022

0.016

0.014

0.013

Table 9-4. Cumulative Phase Active Energy % Error

Versus Current

CURRENT (A)

0°

60°

–60°

0.05

0.019

0.045

–0.032

0.10

0.006

0.058

–0.032

0.25

0.0125

0.045

–0.0385

0.50

0.006

0.032

–0.032

1.00

0.015

0.045

–0.019

2.00

0.003

0.045

–0.039

5.00

0.006

0.024

–0.012

10.00

0.01

0.0165

20.00

–0.007

0.002

–0.013

30.00

0.002

–0.007

0.0085

40.00

–0.016

0.019

50.00

–0.003

–0.035

0.042

60.00

0.002

–0.047

0.053

70.00

0.009

–0.047

0.063

80.00.

0.007

–0.05

0.067

90.00

0.013

–0.045

0.08

100.00

0.0223

–0.04

0.092

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ADS131M08

SBAS950B – OCTOBER 2019 – REVISED FEBRUARY 2021

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