Figure 804: 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 338)
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 1359: Parameters for deadband calculation
Function
Settings
Minimum/maximum
Three-phase current measurement (CMMXU)
A deadband
0.04/40
Three-phase voltage measurement (VMMXU)
V deadband
0.004/4
Phase voltage measurement (VMHMMXU)
V deadband
0.004/4
Single-phase voltage measurement (VAMM-
XU)
V deadband
0.004/4
Residual current measurement (RESCMMXU)
A deadband res
0.04/40
Residual voltage measurement (RESVMMXU)
V deadband res
0.004/4
Frequency measurement (FMMXU)
F deadband
0.04/40
Table continues on the next page
Measurement functions
1MRS759142 F
1438
REX640
Technical Manual