ABB Relion 650 Series Technical Manual page 125

1MRK 511 424-UEN B
Bay control REC650 2.2 IEC
Technical manual
Sequence Detection
3I0<
IL1
Zero
sequence
filter
IL2
Negative
sequence
IL3
filter
3I2<
3U0>
UL1
Zero
sequence
filter
UL2
Negative
sequence
UL3
filter
3U2>
IEC10000036 V2 EN-US
Figure 48: Simplified logic diagram for sequence detection part
The calculated values 3U0, 3I0, 3I2 and 3U2 are available as service values on
local HMI and monitoring tool in PCM600.
Input and output signals
The output signals 3PH, BLKU and BLKZ as well as the signals DLD1PH and
DLD3PH from dead line detections are blocked if any of the following conditions
occur:
• The input BLOCK is activated
• The input BLKTRIP is activated and the internal signal FuseFailStarted is not
present
• The operation mode selector OpMode is set to Off
• The IED is in TEST status (TEST-ACTIVE is high) and the function has been
blocked from the HMI (BlockFUSE=Yes)
The input BLOCK signal is a general purpose blocking signal of the fuse failure
supervision function. It can be connected to a binary input of the IED in order to
receive a block command from external devices or can be software connected to
other internal functions of the IED itself in order to receive a block command from
internal functions. Through OR gate it can be connected to both binary inputs and
internal function outputs.
The input BLKTRIP is intended to be connected to the trip output from any of the
protection functions included in the IED. When activated for more than 20 ms, the
operation of the fuse failure is blocked; a fixed drop-out timer prolongs the block
for 100 ms. The aim is to increase the security against unwanted operations during
Secondary system supervision
100 ms
a
a>b
t
b
AND
100 ms
a
a>b
t
b
AND
a
a>b
b
a
a>b
b
Section 7
CurrZeroSeq
3I0
CurrNegSeq
3I2
FuseFailDetZeroSeq
FuseFailDetNegSeq
VoltZeroSeq
3U0
VoltNegSeq
3U2
IEC10000036-2-en.vsd
M13677-19 v6
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