ABB Relion SMU615 Technical Manual page 182

Section 7
Measurement functions
176
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Figure 119: 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:
(max min) deadband
− ×
t s ( )
=
100 %
Y
∆ ×
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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:
( 40 0 ) 2500 1000 /
− ×
t s ( )
=
0 40 0 30 100 . . %
− ×
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Table 205: Parameters for deadband calculation
Function
Three-phase current
measurement (CMMXU)
Three-phase voltage
measurement (VMMXU)
Residual current measurement
(RESCMMXU)
Frequency measurement
(FMMXU)
Table continues on next page
/ 1000
10 s
=
Settings
A deadband
V Deadband
A deadband res
F deadband
1MRS758407 B
(Equation 8)
Maximum/minimum (=range)
40/0 (=40xIn)
4/0 (=4xUn)
40/0 (=40xIn)
75/35 (=40 Hz) 1)
SMU615
Technical Manual