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 121: Voltage profile causing a reset of the START signal for step 1, and inverse time delay
Definite time delay
When definite time delay is selected, the function will operate as shown in figure
122. Detailed information about individual stage reset/operation behavior is shown
in figure 123 and figure 124 respectively. Note that by setting tResetn = 0.0s,
instantaneous reset of the definite time delayed stage is ensured.
1MRK 505 394-UEN A Section 9
Voltage protection
Line differential protection RED650 2.2 IEC 261
Technical manual
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