Time
Integrator
Voltage
Time
START
TRIP
START
U1>
START
TRIP
t
tIReset1
Time
t
Frozen Timer
Linearly
decreased
Instantaneous
Measured
Voltage
tIReset1
IEC05000020-3-en.vsd
HystAbs1
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
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 117 respectively. Note that by setting tResetn = 0.0s (where
n means either 1 or 2 respectively), instantaneous reset of the definite time delayed
stage is ensured.
Section 9 1MRK 505 394-UEN A
Voltage protection
250 Line differential protection RED650 2.2 IEC
Technical manual
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