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ABB Relion 670 series
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ways to reset the timer, either the timer is reset instantaneously, or the timer value is
frozen during the reset time, or the timer value is linearly decreased during the reset time..
ANSI05000019-3-en.vsd
Voltage
Time
HystAbs1
PICKUP
TRIP
PU_Overvolt1
PICKUP
TRIP
t
tIReset1
Time
Time
Integrator
t
Frozen Timer
Linearly
decreased
Instantaneous
Measured
Voltage
tIReset1
ANSI05000019 V3 EN
Figure 258: Voltage profile not causing a reset of the PICKUP signal for step 1, and inverse time delay
1MRK505222-UUS C Section 8
Voltage protection
509
Technical reference manual

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