ABB REL650 - Page 67

Z 1 = R 1 + jX 1
Z 0 = R 0 + jX0
A B
Zone 1
Zone 2
C
Zone 1
Zone 2
Communication
Zone 4 ( reverse)
Zone 4 ( reverse)
Y
Y
REL 650
REL 650
ANSI11000112_1_en.vsd
ANSI11000112 V1 EN
Figure 16: Principle of blocking communication scheme
A communication signal is sent (CS) if a fault is detected by zone 4 (reverse zone). When
a communication signal is received (CR) the fast zone 2 is blocked. The logic is shown in
figure
17.
1MRK 506 334-UUS A Section 3
REL650 setting examples
61
Application manual