ABB RELION 620 Series Technical Manual page 642

Section 7
Measurement functions
636
Function
Three-phase power and energy
measurement (SP, SE)
Three-phase power and energy
measurement (P, E)
Deadband supervision
The deadband supervision function reports the measured value according to integrated
changes over a time period.
GUID-63CA9A0F-24D8-4BA8-A667-88632DF53284 V1 EN
Figure 322: 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
∆ Y × 100 %
GUID-5381484E-E205-4548-A846-D3519578384B V1 EN
Example for IA, IB, IC:
A deadband = 2500 (2.5% of the total measuring range of 40)
Settings for limit value supervision
High limit
Low limit
High-high limit
Low-low limit
High limit
Low limit
High-high limit
Low-low limit
/ 1000
1MAC504801-IB E
-
-
-
-
-
-
-
-
(Equation 95)
620 series ANSI
Technical Manual