AN3306

Benefits of using STPMxx with Rogowski coil-based sensors

Doc ID 18182 Rev 1

13/21

Equation 9

For poly-phase systems, three correction factors, a 7-bit •, 6-bit • and 4-bit • (gamma)

respectively introduce a ±0.78%, ±0.39% and ±0.09% correction factor.

From these factors, a 4 x 4 matrix, shown in Table 4, implements symmetrical compensation

multiplying each phase and neutral current with its row, adding the products together and

subtracting them from the currents (Equation 10, Equation 11, Equation 12, and Equation

13).

Equation 10

Equation 11

Equation 12

Equation 13

Table 4.

Mutual current compensation matrix for three-phase systems

Phase

R

S

T

N

R

−αβ

γ

S

α−

αβ

T

βα−α

N

γβ

α

−