Figure 292: Integral deadband supervision
The deadband value used in the integral calculation is configured with the
X
deadband
setting. The value represents the percentage of the difference between
the maximum and minimum limit in the units of 0.001 percent x seconds.
The reporting delay of the integral algorithms in seconds is calculated with the
formula:
t s
deadband
Y
( )
(max min) /
%
=
− ×
×
1000
100∆
(Equation 68)
Example for CMMXU:
A deadband = 2500 (2.5% of the total measuring range of 40)
I_INST_A = I_DB_A = 0.30
If I_INST_A changes to 0.40, the reporting delay is:
t s s( )
( ) /
. . %
=
− ×
− ×
=
40 0 2500 1000
0 40 0 30 100
10
Table 584: Parameters for deadband calculation
Function Settings Maximum/minimum
(=range)
Three-phase current meas-
urement (CMMXU)
A deadband 40/0 (=40xIn)
Three-phase voltage meas-
urement (VMMXU)
V Deadband 4/0 (=4xUn)
Residual current measure-
ment (RESCMMXU)
A deadband res 40/0 (=40xIn)
Residual voltage measure-
ment (RESVMMXU)
V deadband res 4/0 (=4xUn)
Table continues on the next page
Measurement functions 1MRS758755 C
574 REC615 & RER615
Technical Manual
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