ABB Relion REG670, Technical Manual

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IL1
IL2
IL3
Zero
sequence
filter
Negative
sequence
filter
UL1
UL2
UL3
Zero
sequence
filter
Negative
sequence
filter
CurrZeroSeq
CurrNegSeq
a
b
a>b
a
b
a>b
a
b
a>b
a
b
a>b
3I2<
t
100 ms
t
100 ms
VoltZeroSeq
VoltNegSeq
AND
AND
FuseFailDetZeroSeq
FuseFailDetNegSeq
Sequence Detection
3U0>
3U2>
3I0
3I2
3U0
3U2
IEC10000036-2-en.vsd
3I0<
IEC10000036 V2 EN
Figure 289: 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 the
1MRK502052-UEN B
Section 13
Secondary system supervision
611
Technical manual