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ABB REL650 - Page 275

ABB REL650
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a<b
a
b
U1<
U
TR1
ST1
IEC09000785-3-en.vsd
t
t1
tReset1
R
t
AND
IEC09000785 V3 EN-US
Figure 130: Logic diagram for step 1, DT operation
U1<
ST1
TR1
tReset1
t1
IEC10000039-3-en.vsd
IEC10000039 V3 EN-US
Figure 131: Example for Definite Time Delay stage1 reset
1MRK 506 382-UEN A Section 8
Voltage protection
Line distance protection REL650 2.2 IEC 269
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