ABB Relion 670 Series Technical Reference Manual page 503

1MRK505222-UUS C
Technical reference manual
When definite time delay is selected the function will operate as shown in figure 251.
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.
V
a
a<b
Pickup1
b
ANSI09000785 V3 EN
Figure 251: Detailed logic diagram for step 1, DT operation
Pickup1
PU_ST1
TRST1
tReset1
t1
ANSI10000039 V3 EN
Figure 252: Example for Definite Time Delay stage1 reset
0
tReset1
R
AND
Section 8
Voltage protection
PU_ST1
TRST1
t1
0
ANSI09000785-3-en.vsd
ANSI10000039-3-en.vsd
497