ABB RED650 Technical Manual page 256

Section 9
Voltage protection
Voltage
U1>
START
TRIP
Time
Integrator
t
Instantaneous
IEC05000020 V3 EN-US
Figure 114: Voltage profile causing a reset of the START signal for step 1, and inverse time delay at
different reset types
250
tIReset1
START
START
Frozen Timer
Linearly
decreased
Definite time delay
When definite time delay is selected, the function will operate as shown in figure
115. Detailed information about individual stage reset/operation behavior is shown
in figure 116 and figure
n means either 1 or 2 respectively), instantaneous reset of the definite time delayed
stage is ensured.
TRIP
HystAbs1
t
117 respectively. Note that by setting tResetn = 0.0s (where
1MRK 505 394-UEN A
tIReset1
Measured
Voltage
Time
Time
IEC05000020-3-en.vsd
Line differential protection RED650 2.2 IEC
Technical manual