Principles For Over-Reach Permissive Communication Logic - ABB REL650 Applications Manual

Section 3
REL650 setting examples
3.1.6.1
58
• Intertrip scheme
• Permissive underreaching scheme
• Permissive overreaching scheme
• Blocking scheme
• Delta blocking scheme
As an example the setting guidelines for delta blocking scheme is given below:
Delta blocking scheme
1. Set Operation = Enabled
2. Set SchemeType = DeltaBlocking
3. Set tCoord = 0.000 s
4. Set tSendMin = 0.000 s
5. Set Unblock = Disabled
(Set to NoRestart if Unblocking scheme with no alarm for loss of guard is to be used.
Set to Restart if Unblocking scheme with alarm for loss of guard is to be used.)
6. Set tSecurity = 0.035 s
7. Set DeltaI = 10 %IB
8. Set DeltaV = 5 %VB
9. Set Delta3I0 = 10 %IB
10. Set Delta3V0 = 5 %VB

Principles for over-reach permissive communication logic

The principle of the logic can be explained as shown in figure 12.
Zone 2
Zone 1
A
REL 650
Y
ANSI11000111 V1 EN
Figure 12: Principle of over-reach communication scheme
B
Z 1 = R 1 + jX 1
Z 0 = R 0 + jX0
Communication
REL 650
Zone 1
Zone 2
1MRK 506 334-UUS A
C
Y
ANSI11000111_1_en.vsd
Application manual