ABB REL650 Technical Manual page 323

1MRK 506 382-UEN A
Line distance protection REL650 2.2 IEC
Technical manual
The FAIL output will be set to high when the following criteria are fulfilled:
• The numerical value of the difference |ΣIphase| – |Iref| is higher than 80% of
the numerical value of the sum |ΣIphase| + |Iref|.
• The numerical value of the current |ΣIphase| – |Iref| is equal to or higher than
the set operate value IMinOp.
• No phase current has exceeded Ip>Block during the last 10 ms.
• CCSSPVC is enabled by setting Operation = On.
The FAIL output remains activated 100 ms after the AND-gate resets when being
activated for more than 20 ms. If the FAIL lasts for more than 150 ms an ALARM
will be issued. In this case the FAIL and ALARM will remain activated 1 s after
the AND-gate resets. This prevents unwanted resetting of the blocking function
when phase current supervision element(s) operate, for example, during a fault.
I L1 I L1
I L2
I L2
I L3
I L3
I ref I ref
OPERATION
BLOCK
IEC05000463 V2 EN-US
Figure 158: Simplified logic diagram for Current circuit supervision CCSSPVC
The operate characteristic is percentage restrained, which is shown in Figure 159.
Secondary system supervision
I>Ip>Block
BLOCK
I>IMinOp
+
å
å
-
+
+
å å
x
+ -
0,8
1,5 x I r
10 ms
Section 10
FAIL
OR
AND
20 ms 100 ms
ALARM
150 ms 1 s
en05000463.tif
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