ABB RELION 670 Series Technical Manual page 638

Section 9
Voltage protection
Voltage
Pickup1
PICKUP
Time
Integrator
Instantaneous
ANSI05000020 V3 EN-US
Figure 341: Voltage profile causing a reset of the PICKUP signal for step 1, and inverse time delay
Definite timer delay
When definite time delay is selected, the function will trip as shown in figure 342. Detailed
information about individual stage reset/operation behavior is shown in figure
respectively. Note that by setting
stage is ensured.
632
PICKUP
TRIP
t
Linearly decreased
tIReset1
PICKUP
HystAbs1
t
Frozen Timer
tResetn = 0.0s , instantaneous reset of the definite time delayed
1MRK 502 066-UUS B
TRIP
Measured
Voltage
Time
Time
ANSI05000020‐3‐en.vsdx
343 and figure
Technical manual
344