ABB RED650 Technical Manual page 242

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Section 9
Voltage protection
Voltage
START
U1<
START
TRIP
Time
Integrator
t
Instantaneous
IEC05000011 V3 EN-US
Figure 105:
Voltage profile causing a reset of the START signal for step 1, and inverse time delay at
different reset types
236
tIReset1
START
Frozen Timer
Linearly decreased
Definite timer delay
When definite time delay is selected the function will operate as shown in figure
106. Detailed information about individual stage reset/operation behavior is shown
in figure
107
and figure
instantaneous reset of the definite time delayed stage is ensured.
HystAbs1
TRIP
t
108
respectively. Note that by setting tResetn = 0.0s,
1MRK 505 394-UEN A
tIReset1
Measured Voltage
Time
Time
IEC05000011-en-3.vsd
Line differential protection RED650 2.2 IEC
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