ABB Relion 670 Series Technical Reference Manual page 528

Section 8
Voltage protection
Voltage
Pickup1
PICKUP
TRIP
Time
Integrator
t
Instantaneous
ANSI05000020 V2 EN
Figure 266: Voltage profile causing a reset of the PICKUP signal for step 1, and inverse time delay
522
tIReset1
PICKUP
PICKUP
Frozen Timer
Linearly decreased
Definite timer delay
When definite time delay is selected, the function will operate as shown in figure 267.
Detailed information about individual stage reset/operation behavior is shown in figure
252 and figure 253 respectively. Note that by setting tResetn = 0.0s, instantaneous reset
of the definite time delayed stage is ensured.
TRIP
HystAbs1
t
ANSI05000020-2-en.vsd
1MRK505222-UUS C
tIReset1
Measured Voltage
Time
Time
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