ABB REL650 Technical Manual page 274

Section 8
Voltage protection
Voltage
START
U1<
START
TRIP
Time
Integrator
t
Instantaneous
IEC05000011 V3 EN-US
Figure 129: Voltage profile causing a reset of the START signal for step 1, and inverse time delay at
different reset types
268
tIReset1
START
Frozen Timer
Linearly decreased
Definite timer delay
When definite time delay is selected the function will operate as shown in figure
130. Detailed information about individual stage reset/operation behavior is shown
in figure 131 and figure
instantaneous reset of the definite time delayed stage is ensured.
HystAbs1
TRIP
t
132 respectively. Note that by setting tResetn = 0.0s,
1MRK 506 382-UEN A
tIReset1
Measured Voltage
Time
Time
IEC05000011-en-3.vsd
Line distance protection REL650 2.2 IEC
Technical manual