ABB RELION 670 Series Technical Manual page 614

Section 9
Voltage protection
respectively. Note that by setting
stage is ensured.
V
Pickup1
ANSI09000785 V3 EN-US
Figure 326: Logic diagram for step 1, DT operation
Pickup1
PU_ST1
TRST1
tReset1
t1
ANSI10000039 V3 EN-US
Figure 327: Example for Definite Time Delay stage1 reset
608
tResetn = 0.0s , instantaneous reset of the definite time delayed
a
a<b
b
R
AND
0 t1
tReset1 0
ANSI09000785-3-en.vsd
1MRK 502 066-UUS B
PU_ST1
TRST1
ANSI10000039-3-en.vsd
Technical manual